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20130331 Stormwater Site Plan 08212013 � � STORMWATER SITE PLAN � 1 � � Weber Property Crystal Springs Road S.E. �- Yelm, Washington � Prepared for: � Randy V�/eber 25720 - 217th Avenue S.E. � Maple Valley, WA 98038 � June 21 , 2013 � Our Job No, 12433 � � ' � �� GHAV Q- S �, �4 Z CNIL ENGINEERING, LAND PLANNING,SURVEYING � . _ . 18215 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 Fax o �' ? BRANCH OFFICES ♦ OLYMPIA,WA ♦ CONCORD,CA �� s� ��j� �. www.barghausen.com °� � <T { �� 'NGFNGLN� AUG 21 2013 RY_ _ � � TABLE OF CONTENTS � 1.0 PROJECT OVERVIEW � 2.0 EXISTING CONDITIONS SUMMARY � 3.0 OFF-SITE ANALYSIS REPORT 4.0 PERMANENT STORMWATER CONTROL PLAN � A. EXISTING SITE HYDROLOGY B. PERFORMANCE STANDARDS AND GOALS � C. FLOW CONTROL SYSTEM D. WATER QUALITY SYSTEM �' E. CONVEYANCE SYSTEM ANALYSIS AND DESIGN � 5.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN 6.0 SPECIAL REPORTS AND STUDIES i � 7.0 OTHER PERMITS 8.0 OPERATION AND MAINTENANCE MANUAL t.. 9.0 FLOODPLAIN ANALYSIS � , ' , ' � � 12433.006.doc � ' � 1.0 PROJECT OVERVIEW � The proposed project site is located on a 7.51-acre parcel located within a portion of Section 19, Township 17 North, Range 2 East, Willamette Meridian, City of Yelm, Thurston County, Washington. Specifically, the site is located Between Crystal Springs Road SE and Rhoton Road �' SE, north of the intersection of Rhoton Road SE and Northern Pacific Road SE. Currently, the site is covered with native and non-native vegetation, dirt roads, a gravel parking area, and is bound by Yelm Creek on the west and Rhoton Road SE on the east. � Under existing conditions, the site is approximately 93 percent pervious with the impervious area being a gravel parking lot located in the southeast corner of the site. Generally the site topography crests in the middle with the west sloping down toward Yelm Creek and the east half � sloping down toward Rhoton Road SE. There are sparse areas of native vegetation located on this site. An effort has been made to �,,. retain the native vegetation as much as possible in the proposed grading plan; the only native vegetation proposed for removal on this site is located on the north east corner of the property. Refer to the FEMA Floodplain Habitat Assessment prepared by Wetlands & Wildlife, Inc., dated June 10, 2013 for more information on restoration and planting of native vegetation. � Proposed construction activities include clearing and grading to make the site more suitable for future construction and elevating the east half of the property above the FEMA Flood Plain while compensating for flood plain storage in the west half of the sitee When the project is complete, the j � site will be completely pervious. Pursuant to Chapter 5 of the City of Yelm Development Guidelines, this project uses the latest �"' version (2012) of the Washington Department of Ecology (DOE) Stormwater Management Manual for Western Washington (SMMWW)for storm water requirements. � ' , ' ' , ' � 12433.006.doc � f "� VICINITY MAP � � � :,� � �, "" � �4/a Ave�5E . n Y p 1 'm' NORTH ��way�r�, � � h YELM F 9 aeLn ti � �^ �� J�}, c��C. � `�a a q� 510 � rQ�$ � ,� � ra��quatiy o � a CanalRdSE Pines �� 3 rn � �+ 'hw Qr SE . � 'jC Ave SE O SE 3 Yetm Nigh� n Yetm Water y�, Schoal m Reclamation u Q,1 � Facility `��a'� � Aquatic Pa � � � � 8ettiware '°�� A 0 Q�' L�ngmire m �Y y '`' Gummunity Park s�,ass Pi,� `� . !�' � �GP 1� 1�i ° 510 m � ; YELM a� �s .�' �I ah�� y�`'� Yelm , 507 � �inemas F 103rd Ave SE � `" `�0/i�i m 5��' � ,�r.P o � 6right��' m � 50T ^ 507 � 8irkiand 5�� d SE � �a�ryFli//R�S�' 109th Ave SE rn I � ,`�flA'1+�+66bgle� � � � � � i _ � � � � � � � � � � a MM ObZ66lS OOZ6665 :....� ��l�9E oZZI ` �_.. 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III � .C,� 'e1 fli {J � m � d ❑ '� .�._��i fA 3 C a u, z c°� oI' � n � , � Soil Map-Thurston County Area,Washington � Map Unit Legend � Thurston County Area,Washington(WA667) � Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI i 65 McKenna gravelly silt loam,0 to 5 0.0 0.1% , , percent slopes 110 ,Spanaway gravelly sandy loam,0 to 3 9A, 95.7% � percent slopes � II . - -�--- y y Y - -- -- -- - -- 113 S anawa ston sand loam,3 to 15 0.4 I 4.2% percent slopes ' I � Totals for Area of Interest 9.4' 100.0%,, -- ' f ' , � � , ' � ' ' � � ' � �� Natural Resources Web Soil Survey 6/6/2013 �� Conservation Service National Cooperative Soil Survey Page 3 of 3 � � f � 2.0 EXISTING CONDITIONS SUMMARY � Under existing conditions, the site is approximately 93 percent pervious. The site topography crests in the middle with the west gently sloping down toward Yelm Creek and the east half gently sloping down toward Rhoton Road SE. This creates two separate threshold discharge areas on *" the site for consideration of the stormwater requirements. , i ' ; , � , � ' � , , ' � ' � � 12433.006.doc I , � 3.0 OFF-SITE ANALYSIS REPORT Since this project does not add 5,000 square feet or more of new hard surface, or convert 3/4 r`` acres of vegetation to lawn or landscaped areas, or convert 2.5 acres of forested area to pasture, an off-site analysis is not required per the 2012 DOE Stormwater Management Manual, and has "'� not been prepared for this project. However, a cursory review of the site shows that the west half of the project discharges to Yelm Creek which flows to the north and the east half of the site discharges to a roadside ditch that � also flows to the north. The roadside ditch and Yelm Creek do not intersect with each other within a quarter mile downstream of the site. � , ' � � ' ' ' � ' � � � 12433.006.doc � ' � 4.0 PERMANENT STORMWATER CONTROL PLAN The project is split into two threshold discharge areas that are separated by a crest that roughly "`° passes through the middle of the site. The proposed scope of work on this project will not add any impervious surface area, will not convert any vegetation to lawn or landscaped areas, and will � not convert more than an acre of native vegetation to pasture. As such, this project is only subject to Minimum Requirements 1 through 5 as outlined in the 2012 DOE SMMWW. � A. APPLICABLE MINIMUM REQUIREMENTS Minimum Requirement No. 1: Preparation of Stormwater Site Plans: � Response: Stormwater Site Plans have been prepared for this project as required. Minimum Requirement No. 2: Construction Stormwater Pollution Prevention: � Response: A SWPPP has been prepared for this project and is included in Section 5 of this report. � Minimum Requirement No. 3: Source Control Prevention: Response: The site will not be used to store anything, and as such there will be no � potential for pollutants. Minimum Requirement No. 4: Preservation of Natural Drainage System and Outfalls: � Response: When the site work is completed, the existing drainage features of the property will remain largely intact and the site will continue to crest in the middle as it does currently. � Minimum Requirement No. 5: On-Site Stormwater Management: Response: Since the purpose of the project is specifically for grading only and no � impervious surfaces will be added to the site, further stormwater management is not proposed or required. � ' , ' r � 12433.006.doc � , i � 5.0 CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN A CSWPPP has been prepared for this project and is included for reference in this section of the �"" report. � ' ' � ' , ' ' , ' ' ' ' ' � 12433.006.doc � � � i � Stormwater Pollution Prevention Plan � For � Weber Property Prepared For � Northwest Regional Office 3190 - 160th Avenue SE Bellevue, WA 98008-5452 � 425-649-7000 � Owner Developer Operator/Contractor Randy Weber Randy Weber TBD � 25720 217th Avenue S.E. 25720 217th Avenue S.E. � Maple Valley, WA 98038 Maple Valley, WA 98038 � � Project Site Location � Between NW Crystal Springs Street and Rhoton Road S.E. Yelm, Washington � Certified Erosion and Sediment Control Lead TBD � SWPPP Prepared By Barghausen Consulting Engineers, Inc. � 18215 72nd Avenue South Kent, WA 98032 (425) 251-6222 Will Schuur, Design Engineer � SWPPP Preparation Date � 6/19/2013 Approximate Project Construction Dates TBD � � ' � i 12433.007.doc � ; � ' � s � Contents � � 1.0 Introduction...............................................................................................................................l I2.0 Site Description ........................................................................................................................3 � 2.1 Existing Conditions.....................................................................................a.....................3 2.2 Proposed Construction Activities......................................................................................3 3.0 Construction Stormwater BMPs...............................................................................................5 � 3.1 The 12 BMP Elements.......................................................................................................5 3.1.1 Element#1 —Mark Clearing Limits...................................................................5 � 3.1.2 Element#2 —Establish Construction Access.....................................................5 3.1.3 Element#3 —Control Flow Rates.......................................................................5 3.1.4 Element#4— Install Sediment Controls.............................................................5 3.1.5 Element#5 —Stabilize Soils...............................................................................6 � 3.1.6 Element#6—Protect Slopes...............................................................................6 '''' 3.1.7 Element#7—Protect Drain Inlets.......................................................................6 � 3.1.8 Element#8 — Stabilize Channels and Outlets.....................................................6 3.1.9 Element#9—Control Pollutants.........................................................................7 � 3.1.10 Element#10—Control Dewatering...................................................................7 3.1.11 Element#11 —Maintain BMPs.........................................................................7 3.1.12 Element#12—Manage the Project....................................................................7 I3.2 Site Specific BMPs..........................................................................................................10 � � 4.0 Construction Phasing and BMP Implementation....................................................................1 l � 5.0 Pollution Prevention Team ,.,...o...............................................................................................12 5.1 Roles and Responsibilities...............................................................................................12 � 5.2 Team Members................................................................................................................13 � 6.0 Site Inspections and Monitoring...............................................o....................,........................15 I' 6.1 Site Inspection...................o...............................................,.............................................15 � 6.1.1 Site Inspection Frequency ...........................................................e....................15 6.1.2 Site Inspection Documentation............................o............................................16 ' 6.2 Stormwater Quality Monitoring......................................................................................16 � 6.2.1 Turbidity...........................................................................................................16 I6.2.2 pH.....................................................................................................................17 � pH monitoring shall be conducted as follows:..............................................................17 7.0 Reportmg and Recordkeeping................................................................................................19 � 7.1 Recordkeeping.................................................................................................................19 7.1.1 Site Log Book...............................................................................o...................19 7.1.2 Records Retention.............................................................................................19 �„'. 7.13 Access to Plans and Recards............................................................................19 i� I� � ii 12433.007.doc � � � � 7.1.4 Updating the SWPPP........................................................................................20 7.2 Reporting.........................................................................................................................20 "`" 7.2.1 Discharge Monitoring Reports ......................................................................... 7.2.2 Notification of Noncompliance........................................................................20 � Appendix B—Construction BMPs.........................................................................................22 AppendixC—General Permit.........................................................................................o.......23 Appendix D—Site Inspection Forms (and Site Log) .............................................................24 � Appendix A Site plans ■ Vicinity map (with all discharge points) ■ Site plan with TESC measures � Appendix B Construction BMPs Appendix C General Permit � Appendix D Site Log and Inspection Forms � ' ' i 1 i 1 1 � 1 ! � iii 12433.007.doc � � � Stormwater Pollution Prevention Plan 1.0 Introduction �.- � This Stormwater Pollution Prevention Plan (SWPPP) has been prepared as part of the NPDES Stormwater Permit requirements for the proposed Weber Property project in Yelm, Washington. The site is located between NW Crystal Springs Street and Rhoton Road S.E. in the city of Yelm, � Washington. The proposed project is located on a 7.57-acre site. Currently, the site is covered with native and non-native vegetation, dirt roads, and a gravel parking area. The proposed Weber Property project proposes to fill the east half of the srte to the base flood elevation for � future construction while excavating the west half of the site far compensatory flood plain storage. Construction activities will include: clearing, excavation, and grading. The purpose of this �, SWPPP is to describe the proposed construction activities and all temporary and permanent erosion and sediment control (TESC) measures, pollutions prevention measures, � inspection/monitoring activities, and recordkeeping that will be implemented during the proposed construction project. The objectives of the SWPPP are to: 1. Implement Best Management Practices (BMPs) to prevent erosion and � sedimentation, and to identify, reduce, eliminate or prevent stormwater contamination and water pollution from construction activity. � 2. Prevent violations of surface water quality, ground water quality, or sediment management standards. �, 3. Control peak flow rates and velocities of stormwater runoff. � This SWPPP used as guidance the Ecology SWPPP template downloaded from the Ecology website. This SWPPP is based on the Construction Stormwater General Permit and guidance contained in the Stormwater Management Manual for Western Washington (SWMMWW 2012). The report is divided into seven main sections with several appendices that include stormwater � relted reference materials. The topics presented ❑ Section 1 —INTRODUCTION. This section provides a summary � description of the project, and the organization of the SWPPP document. � ❑ Section 2— SITE DESCRIPTION. This section provides a � description of the existing site conditions,proposed construction activities, and calculated stormwater flow rates for existing conditions and post—construction conditions. - � � 1 12433.007.doc � i , A,,. Stormwater Po/lution Prevention Plan ❑ Section 3 —CONSTRUCTION BMPs. This section provides a detailed description of the BMPs to be implemented based on the °i` 12 required elements of the SWPPP (SWMMWW 2005). � ❑ Section 4—CONSTRUCTION PHASING AND BMP IMPLEMENTATION. This section provides a description of the � timing of the BMP implementation in relation to the project schedule. � ❑ Section 5 —POLLUTION PREVENTION TEAM. This section � identifies the appropriate contact names (emergency and non- emergency), monitoring personnel, and the on-site temporary erosion and sedimentation control CESCL. �. ❑ Section 6—INSPECTION AND MONITORING. This section � provides a description of the inspection and monitoring requirements such as the parameters of concern to be monitored, sample locations, sample frequencies, and sampling methods for � all stormwater discharge locations from the site. � ❑ Section 7—RECORDKEEPING. This section describes the requirements for documentation of the BMP implementation, site inspections, monitoring results, and changes to the implementation � of certain BMPs due to site factors experienced during construction. � Su orting documentation and standard forns are provided in the following Appendices: PP I � Appendix A— Site plans Appendix B —Construction BMPs ' �. Appendix C—General Permit � Appendix D— Site Log and Inspection Forms � � � �I � 2 12433.007.doc � ' �r Stormwater Pollution Prevention Plan I�w � 2.0 Site Description � 2.1 Existing Conditions The proposed Weber Properiy project site is located on a 7.57-acre site located within a portion '� of the Northwest '/4, Section 19, Township 17 North., Range 2 East, Willamette Meridian, City of Yelm, Thurston County, Washington, Specifically, the site is located between NW Crystal � Springs Street and Rhoton Road S.E. Currently,the site consists entirely of pasture and trees. Under existing conditions, the site is approximately 93 percent pervious. When the project is � complete, the site work will have added no new impervious areas. The site topography consists of slopes ranging from 0 to 3 percent. There is a high point near the � center of the site. Stormwater from the eastern portion of the site drains eastward into an existing ditch on Rhoton � Road S.E. Stormwater from the western portion of the site drains to Yelm Creek. Yelm Creek runs south to north along the west properiy line. � � 2.2 Proposed Construction Activities Upon completion of the project, the eastern half of the site will have been raised to an elevation � of 335 and the western half of the site will have been excavated for compensatory flood plain storage. � The following summarizes details regarding site areas: ■ Total site area: 7.57 acres � ■ Percent im ervious area before construction: 7 % P � ■ Percent impervious area after construction: 0 % ■ Disturbed area during construction: 4.98 acres � ■ Disturbed area that is characterized as impervious (i.e., access roads, staging, parking)e 0.53 acres � � I � 3 12433.007.doc �r� ' ' � � � � � ' � ' ' ' � , � � � � � ' i � � Stormwater Pollufion Prevention Plan � 3.0 Construction Stormwater BMPs � 3.1 The 12 BMP Elements �, 3.1.1 Element#1 —Mark Clearing Limits � To protect adjacent properties and to reduce the area of soil exposed to construction, the limits of construction will be clearly marked before land-disturbing activities begin. Trees that are to be preserved, as well as all sensitive areas and their buffers, shall be clearly delineated, both in the � field and on the plans. In general, natural vegetation and native topsoil shall be retained in an undisturbed state to the maximum extent possible. The BMPs relevant to marking the clearing limits that will be applied for this project include: �' in Natural Ve etation BMP C 101 Preserv g g ( ) � 3.1.2 Element#2—Establish Construction Access � Construction access or activities occurring on unpaved areas shall be minimized, yet where necessary, access points shall be stabilized to minimize the tracking of sediment onto public roads, and wheel washing, street sweeping, and street cleaning shall be employed to prevent � sediment from entering state waters. All wash wastewater shall be controlled on site. The specific BMPs related to establishing construction access that will be used on this project include: ' � Stabilized Construction Entrance/Exit(BMP C105) �° �' 3.1.3 Element#3 —Control Flow Rates In arder to protect the properties and waterways downstream of the project site, stormwater � discharges from the site will be controlled. The specific BMPs for flow control that shall be used on this project include: � � Straw Wattles (BMP C235) � 3.1.4 Element#4—Install Sediment Controls �! � All stormwater runoff from disturbed areas shall pass through an appropriate sediment removal � BMP before leaving the construction site or prior to being discharged to an infiltration facility. The specific BMPs to be used for controlling sediment on this project include: � 5 12433.007.doc �_ i � � Stormwater Pollution Prevention Plan Silt Fencing (BMP C233) � Straw Wattles (BMP C235) � 3.1.5 Element#5—Stabilize Soils � Exposed and unworked soils shall be stabilized with the application of effective BMPs to prevent erosion throughout the life of the project. The specific BMPs for soil stabilization that shall be �, used on this project include: �° Temporary and Permanent Seeding (BMP C120) � 3.1.6 Element#6—Protect Slopes All cut and fill slopes will be designed, constructed, and protected in a manner than minimizes � erosion. The following specific BMPs will be used to protect slopes for this project: � Temporary and Permanent Seeding (BMP C120) 3.1.7 Element#7—Protect Drain Inlets � All storm drain inlets and culverts made operable during construction shall be protected to prevent unfiltered or untreated water from entering the drainage conveyance system. However, � the first priority is to keep all access roads clean of sediment and keep street wash water separate from entering storm drains until treatment can be provided. Storm Drain Inlet Protection (BMP C220)will be implemented for all drainage inlets and culverts that could potentially be impacted � by sediment-laden runoff on and near the project site. The following inlet protection measures will be applied on this project: � Storm Drain Inlet Protection (BMP C220) — tabilize Channels and Outlets �. 3.1.8 Element#8 S Where site runoff is to be conveyed in channels, or discharged to a stream or some other natural � drainage point, efforts will be taken to prevent downstream erosion. This project does not propose any concentrated discharges to off-site areas. Site run-off will be in the form of sheet- �I �, flow and will�be mitigated with straw wattles and silt fencing. If it becomes necessary, the � specific BMPs for channel and outlet stabilization that shall be used on this project include: Outlet Protection(BMP C209) � � 6 12433.007.doc � I � � Stormwater Po/lution Prevention Plan 3.1.9 Element#9—Control Pollutants � All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Good � housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well organized, and free of debris. If required, BMPs to be implemented to control specific sources of pollutants are discussed below. �� Material on Hand(BMP C 150) � The facility does not require a Spill Prevention, Control, and Countermeasure (SPCC) Plan under the Federal regulations of the Clean Water Act(CWA). �' 3.1.10 Element#10—Control Dewatering Given the scope of work on this project, dewatering should not be necessary as part of this � construction project. � 3.1.11 Element#11 —Maintain BMPs �, All temparary and permanent erosion and sediment control BMPs shall be maintained and � repaired as needed to assure continued performance of their intended function. Maintenance and repair shall be conducted in accordance with each particular BMP's specifications. Visual � monitoring of the BMPs will be conducted at least once every calendar week and within 24 hours of any rainfall event that causes a discharge from the site, If the site becomes inactive, and is temporarily stabilized, the inspection frequency will be reduced to once every month. �i All temporary erosion and sediment control BMPs shall be removed within 30 days after the final site stabilization is achieved or after the temporary BMPs are no longer needed, Trapped sediment shall be removed or stabilized on site. Disturbed soil resulting from removal of BMPs � or vegetation shall be permanently stabilized. , �' �„ 3.1.12 Element#12—Manage the Project �k, Erosion and sediment control BMPs for this project have been designed based on the following � principles: , , ■ ' �fl Design the project to fit the existing topography, soils, and drainage � patterns. i�, ■ Emphasize erosion control rather than sediment control. �� ■ Minimize the extent and duration of the area exposed. � �' � 7 12433.007.doc � _ � Stormwater Pollution Prevention Plan � ■ Keep runoff velocities low. � ■ Retain sediment on site. � ■ Thoroughly monitor site and maintain all ESC measures. ■ Schedule major earthwork during the dry season. �. In addition,project management will incorporate the key components listed below: � As this project site is located west of the Cascade Mountain Crest, the project will be managed according to the following key project components: �, Phasing of Construction ■ The construction project is being phased to the extent practicable in order � to prevent soil erosion, and, to the maximum extent possible, the transport of sediment from the site during construction. � ■ Revegetation of exposed areas and maintenance of that vegetation shall be an integral part of the clearing activities during each phase of construction, � per the Scheduling BMP (C 162). Seasonal Work Limitations � ■ From October 1 through April 30, clearing, grading, and other soil disturbing activities shall only be permitted if shown to the satisfaction of �, the local permitting authority that silt-laden runoff will be prevented from leaving the site through a combination of the following: � ❑ Site conditions including existing vegetative coverage, slope, soil type, and proximity to receiving waters; and , � ❑ Limitations on activities and the extent of disturbed areas; and ' �. ❑ Proposed erosion and sediment control measures. , � ■ Based on the information provided and/or local weather conditions, the � local permitting authority may expand or restrict the seasonal limitation on ' �, site disturbance. ■ The following activities are exempt from the seasonal clearing and grading I, � limitations: � 8 12433.007.doc � I � � Stormwater Pollution Prevention Plan ❑ Routine maintenance and necessary repair of erosion and sediment � control BMPs; � ❑ Routine maintenance of public facilities or existing utility structures that do not expose the soil or result in the removal of the vegetative cover to soil; and � ❑ Activities where there is 100 percent infiltration of surface water runoff within the site in approved and installed erosion and sediment control facilities. �, Coordination with Utilities and Other Jurisdictions � ■ Care has been taken to coordinate with utilities, other construction projects, and the local jurisdiction in preparing this SWPPP and scheduling the construction work. � Inspection and Monitoring � ■ All BMPs shall be inspected, maintained, and repaired as needed to assure continued performance of their intended function. Site inspections shall � be conducted by a person who is knowledgeable in the principles and practices of erosion and sediment control. This person has the necessary skills to: � it onditions and construction activities that could ❑ Assess the s e c impact the quality of stormwater, and � ❑ Assess the effectiveness of erosion and sediment control measures used to control the quality of stormwater discharges. � � A Certified Erosion and Sediment Control Lead shall be on-srte or on-call at all times. � ■ h BMP identified Whenever mspection and/or momtormg reveals that t e s ' � in this SWPPP are inadequate, due to the actual discharge of or potential to discharge a significant amount of any pollutant, appropriate BMPs or design changes shall be implemented as soon as possible. � Maintaining an Updated Construction SWPPP � ■ This SWPPP shall be retained on-site or within reasonable access to the site. � 9 12433.007.doc � � � Stormwater Po/lution Prevention Plan ■ The SWPPP shall be modified whenever there is a change in the design, � construction, operation, or maintenance at the construction site that has, or could have, a significant effect on the discharge of pollutants to waters of � the state. ■ The SWPPP shall be modified if, during inspections or investigations � conducted by the owner/operator, or the applicable local or state regulatory authority, it is determined that the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater � discharges from the siteo The SWPPP shall be modified as necessary to include additional or modified BMPs designed to correct problems identified. Revisions to the SWPPP shall be completed within seven (7) � days following the inspection. � 3.2 Site Specific BMPs Site specific BMPs are shown on the TESC Plan Sheets and Details in Appendix Ae These site � specific plan sheets will be updated annually. � � � � � � � � � I �. 10 12433.007.doc �r= � � Stormwater Pollution Prevention Plan 4.0 Construction Phasing and BMP � Implementation .� ' BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY,A PRE- CONSTRUCTION MEETING MUST BE HELD BETWEEN CITY OFFICIALS,THE APPLICANT,AND THE APPLICANT'S CONSTRUCTION REPRESENTATIVE. � CONTRACTOR SHALL NOTIFY THE CITY CONSTRUCTION INSPECTION PERSONNEL TO SCHEDULE THE PRE-CONSTRUCTION CONFERENCE ON- SITE. ' FLAG AND FENCE LIMITS OF CLEARING. � • INSTALL CONSTRUCTION ENTRANCE AND ASSOCIATED CULVERT AS INDICATED ON PLAN, � ■ INSTALL FILTER FABRIC FENCE AS INDICATED ON PLANS. � ' CLEAR AND GRUB AREAS OF THE SITE TO BE ROUGH GRADED OR FILLED AND STABILIZE SLOPES. AREAS THAT MAY NOT BE WORKED UNTIL LATER � SHOULD BE LEFT IN THE NATURAL STATE TO PREVENT EROSION. ' MAINTAIN FACILITIES AND MODIFY AS NECESSARY DEPENDING ON SITE CONDITIONS AND STAGES OF CONSTRUCTION ACTIVITY, � ■ GRADE SITE TO FINISH GRADE AND STABILIZE ALL SLOPES. �, • CONTRACTORS SHALL BE RESPONSIBLE FOR MAINTENANCE OF THE TEMPORARY EROSION AND SEDIMENTATION CONTROL(TESC)FACILITIES THROUGHOUT CONSTRUCTION. � • REMOVE TEMPORARY EROSION CONTROL FACILITIES WHEN T'HE SITE IS � �"'" COMPLETELY STABILIZED AND APPROVED BY THE CITY OF YELM. '� ' ALL TEMPORARY EROSION AND SEDIMENTATION CONTROL BMP'S SHALL � BE REMOVED WITHIN 30 DAYS AFTER FINAL SITE STABILIZATION IS ACHIEVED. • COMPLETE INSPECTION PUNCHLIST. � � � 11 12433.007.doc � � � Stormwater Pollution Prevention Plan 5.0 Pollution Prevention Team � � 5.1 Roles and Responsibilities � The pollution prevention team consists of personnel responsible for implementation of the SWPPP, including the following: � ■ Certified Erosion and Sediment Control Lead (CESCL)—primary contractor contact, responsible for site inspections (BMPs, visual monitoring, sampling, etc.); to be called upon in case of failure of any � ESC measures. ■ Resident Engineer—For projects with engineered structures only � (sediment ponds/traps, sand filters, etc.): site representative for the owner that is the project's supervising engineer responsible for inspections and issuing instructions and drawings to the contractor's site supervisor or � representative ■ Emergency Ecology Contact—individual to be contacted at Ecology in � case of emergency. ■ Emergency Owner Contact—individual that is the site owner or � representative of the site owner to be contacted in the case of an emergency. � ■ Non-Emergency Ecology Contact—individual that is the site owner or representative of the site owner than can be contacted if required. �" �, ■ Monitoring Personnel—personnel responsible for conducting water quality monitoring; for most sites this person is also the Certified Erosion � and Sediment Control Lead. � � � � i� ' �, 12 12433.007.doc � I ' � Stormwater Pollution Prevention Plan � 5.2 Team Members "" Names and contact information for those identified as members of the pollution prevention team are provided in the following table. Title Name(s) Phone Number ' �, Certified Erosion and Sediment Control Lead(CESCL) TBD � Resident Engineer Hal P.Grubb,P.E. (425)251-6222 �� Emergency Ecology Contact Staff on Duty (360)407-6242 Emergency Owner Contact Randy Weber (206)510-5563 �R Non-Emergency Ecology Contact TBD � Monitoring Personnel TBD � � � � � � � � � i ! � 13 12433.007.doc � � [ � Stormwater Pollution Prevention Plan 6.0 Site Inspections and Monitoring � � Monitoring includes visual inspection, monitoring for water quality parameters of concern, and documentation of the inspection and monitoring findings in a site log book. A site log book will be maintained for all on-site construction activities and will include: � ■ A record of the implementation of the SWPPP and other permit requirements; � ■ Site inspections; and, � ■ Stormwater quality monitoring. For convenience, the inspection form and water quality monitaring forms included in this � SWPPP include the required information for the site log book. This SWPPP may function as the site log book if desired, or the forms may be separated and included in a separate site log book. However, if separated, the site log book but must be maintained on-site or within reasonable � access to the site and be made available upon request to Ecology or the local jurisdiction. �, 6.1 Site Inspection All BMPs will be inspected, maintained, and repaired as needed to assure continued performance � of their intended function. The inspector will be a Certified Erosion and Sediment Control Lead (CESCL)per BMP C160. The name and contact information for the CESCL is provided in � Section 5 of this SWPPP, Site inspection will occur in all areas disturbed by construction activities and at all stormwater discharge points. Stormwater will be examined for the presence of suspended sediment, �, turbidity, discoloration, and oily sheen. The site inspector will evaluate and document the effectiveness of the installed BMPs and determine if it is necessary to repair or replace any of the BMPs to improve the quality of stormwater discharges. All maintenance and repairs will be � documented in the site log book or forms provided in this document. All new BMPs or design changes will be documented in the SWPPP as soon as possible. � 6.1.1 Site Inspection Frequency � Site inspections will be conducted at least once a week and within 24 hours following any discharge from the siteo For sites with temporary stabilization measures, the site inspection frequency can be reduced to once every month. �» � ' � 15 12433.007.doc � � � Stormwater Pollution Prevention Plan 6.1.2 Site Inspection Documentation �. The site inspector will record each site inspection using the site log inspection forms provided in Appendix D. The site inspection log forms may be separated from this SWPPP document, but � will be maintained on-site or within reasonable access to the site and be made available upon request to Ecology or the local jurisdictiono � 6.2 Stormwater Quality Monitoring � 6.21 Turbidity � 1, Sampling Methods a. Monitoring Personnel (TBD) shall conduct turbidity sampling pursuant to Condition � S4.0 of the permit. 2. Sampling Frequency � a. Sam lin shall be conducted at least once every calendar week, when there is a discharge P g of stormwater (or authorized non-stormwater) from the site. Samples shall be � representative of the flow and characteristics of the discharge. b. When there is no discharge during a calendar week, sampling is not required. � c. Sampling is not required outside of normal warking hours or during unsafe conditions. If the monitoring personnel are unable to sample during a monitoring period, the Discharge � Monitoring Report(DMR) shall include a brief explanation. 3. Sampling Locations � a. Sampling is required at all discharge points where stormwater (or authorized non- stormwater) is discharged off site. �� b. The sampling point is identified on the SWPPP site map and shall be clearly marked in the field with a flag, tape, stake, or other visible marker. Sampling and Analysis Methods � a. Turbidity analysis shall be performed with a calibrated turbidity meter (turbidimeter), either on-site or at an accredited lab. The results shall be recorded in the site log book in Nephelometric Turbidity Units (NTU). � Parameter Units Analytical Sampling Benchmark � Method Fre uenc Value Turbidity NTU SM2130 or Weekly, if 25 NTU � EPA 180.1 disc�ar in 16 12433.007.doc � ' ,�r Stormwater Pollution Prevention Plan 5. Turbidity Values: The benchmark value for turbidity is 25 NTU (Nephelometric Turbidity Units). ra I a. Turbidity 26—249 NTU: � � If the discharge turbidity is greater than 25 NTU, but less than 250 NTU, the CESL shall: i. Review the SWPPP for compliance with Condition S9 of the Permit and make � appropriate revisions within 7 days of the discharge that exceeded the benchmark; and ii. Fully implement and maintain appropriate source control and/or treatment BMPs as � soon as possible, but within 10 days of the discharge that exceeded the benchmark; and '" iii. Document BMP implementation and maintenance in the site log book. a. Turbidity 250 NTU ar greater, or Transparency 6 cm or less: If discharge turbidity is greater than or equal to 250 NTU the CESCL shallo � i. Notify Ecology by phone in accordance with Condition SS.A. of the permit; and ii, Review the SWPPP for compliance with Condition S9 of the permit and make � appropriate revisions within 7 days of the discharge that exceeded the benchmark; and � iii. Fully implement and maintain appropriate source control and/or treatment BMPs as soon as possible,but within 10 days of the discharge that exceeded the benchmark; iv. Document BMP implementation and maintenance in the site log book; and � v. Continue to sample discharges daily until: • turbidity is 25 NTU (or lower); or • the CESCL has demonstrated compliance with the water quality standard for � turbidity: • no mare than 5 NTU over background turbidity, if background is less than 50 �' NTU, or �" • no mare than 10 percent over background turbidity, if background is 50 NTU or greater; or I � • the discharge stops or is eliminated. �. 6.2.2 pH � pH monitoring shall be conducted as follows: � 1 The H monitorin eriod shall commence when the concrete is first ex osed to • P gP p precipitation and continue weekly until stormwater pH is 8.5 or less. �, 2. During the pH monitoring period, a representative sample of stormwater shall be obtained and pH analysis shall be conducted at least once per week. � 17 12433.007.doc I � ' � Stormwater Po/lution Prevention Plan 3. pH monitoring shall occur in the sediment pond or at other locations that receive stormwater runoff from the area of significant concrete work or engineered soils prior to � � discharge to surface waters. 4. The benchmark value far pH is 8.5 standard units. Any time sampling indicates that pH � is 8.5 ar greater, the contractor shall: 5. Prevent the high pH water (8.5 or above) from entering storm sewer systems or surface � waters; and, a. If necessary, adjust or neutralize the high pH water using an appropriate treatment BMP such as COZ sparging or dry ice. The operator shall consult with KeyBank and � shall obtain written approval from Ecology prior to using any form of chemical treatment other than COZ sparging or dry ice. 6. pH analysis shall be performed on-site with a calibrated pH meter, pH test kit, or wide � range pH indicator paper. The pH monitoring results shall be recorded in the site logbook. � � ' � � � � � � � � ��', �. 18 12433.007.doc ' � i ' �. Stormwater Pol/ution Prevention Plan � � YM � 7.0 Reporting and Recordkeeping � 7.1 Recordkeeping 7.1.1 Site Log Book � A site log book will be maintained for all on-site construction activities and will include: � ■ A recard of the implementation of the SWPPP and other permit requirements; � ■ Site inspections; and, ■ Stormwater quality monitoring, � For convenience, the inspection form and water quality monitoring forms included in this � SWPPP include the required information for the site log book. 7.1.2 Records Retention � Records of all monitoring information (site log book, inspection reports/checklists, etc.), this Stormwater Pollution Prevention Plan, and any other documentation of compliance with permit � requirements will be retained during the life of the construction project and for a minimum of three years following the termination of permit coverage in accordance with permit condition SS.C. � 7.1.3 Access to Plans and Records I � The SWPPP, General Permit,Notice of Authorization letter, and Site Log Book will be retained on site or within reasonable access to the site and will be made immediately available upon � request to Ecology or the local jurisdiction. A copy of this SWPPP will be provided to Ecology within 14 days of receipt of a written request for the SWPPP from Ecology. Any other information requested by Ecology will be submitted within a reasonable time. A copy of the SWPPP or access to the SWPPP will be provided to the public when requested in writing in � accordance with permit condition SS.G. ' ', � 19 12433.007.doc ' � I � � Stormwater Pollution Prevention Plan � �, 7.1.4 Updating the SWPPP �I �„ In accordance with Conditions S3, S4.B, and S9.B.3 of the General Permit, this SWPPP will be modified if the SWPPP is ineffective in eliminating or significantly minimizing pollutants in stormwater dischar es from the site or there has been a chan e in desi n, construction, o eration, g g g P � or maintenance at the site that has a significant effect on the discharge, or potential for discharge, of pollutants to the waters of the State. The SWPPP will be modified within seven days of I� � determination based on inspection(s) that additional or modified BMPs are necessary to correct problems identified, and an updated timeline for BMP implementation will be prepared. � 7.2 Re ortin P g � 2 i v� 7. . scharge Monitoring Reports �. [Prior to October 2008] If cumulative soil disturbance is sznaller than 5 acres: Discharge Monitoring Report(DMR) forms will not be submitted to Ecology because water quality sampling is not being conducted at the site. I I� If cumulative soil disturbance is 5 acres or lar er: Dischar e Monitorin Re orts DMRs will be � g g g p � ) w submitted to Ecology monthly. Of there was no discharge during a given monitoring period, the Permittee shall submit the form as required, with the words "No discharge" entered in the place � of monitoring results. The DMR due date is 15 days following the end of each month. I � 7.2.2 Notification of Noncompliance If any of the terms and conditions of the permit are not met, and it causes a threat to human �I � health ar the environment, the following steps will be taken in accordance with permit section SS.F: 1. Ecology will be immediately notified of the failure to comply. � � 2. Immediate action will be taken to control the noncompliance issue and to correct the problem. If applicable, sampling and analysis of any � noncom liance will be re eate imm ' p p d ediately and the results submitted to Ecology within five (5) days of becoming aware of the violation, ' � 3. A detailed written report describing the noncompliance will be submitted to Ecology within five (5) days, unless requested earlier by Ecology, ' � In accordance with ermit condition S2.A a com 1 t p , p e e application form will be submitted to Ecology and the appropriate local jurisdiction (if applicable) to be covered by t�e General ' � Permit. � 20 12433.007.doc � , � Stormwater Pollution Prevention Plan � ' ' ' � ' ' ' ' ' ' � ' � ' ' i ' � � 21 12433.007.doc � I ' II � Stormwater Pollution Prevention Plan � � A endix B — Construction BMPs PP � Preserving Natural Vegetation(BMP C101) � Stabilized Construction Entrance/Exit(BMP C 105) � Straw Wattles (BMP C235) , � Silt Fencing (BMP C233) �' Temporary and Permanent Seeding (BMP C 120) � Storm Drain Inlet Protection(BMP C220) ' �, Outlet Protection (BMP C209) �" Material on Hand(BMP C150) ' � , , ' t ' ' ' ' � � � 22 12433.007.doc �,. i � 4� BMP C1Q1: Preserving Natural Vegetation � Purpose The purpose of preserving natural vegetation is to reduce erosion wherever practicable. Limiting site disturbance is the single most effective method for reducing erosion. For exarnple, conifers can hold up to about 50 percent of alI rain that falls during a storm. Up to 20-30 percent of this rain � may never reach the ground but is taken up by the tree or evaporates. Another benefit is that the rain held in the tree can be released slowly to the ground after the storm. � Conditions o Use Natural ve etation should be reserved on stee slo es near erennial .f � p P � � P and intermittent watercourses or swales, and on building sites in wooded � areas. • As required by local governments. • Phase construction to preserve natural vegetation on the project site for as long as possible during the construction period. ��'II � Design and Natural vegetation can be preserved in natural clurnps ar as individual Installation trees, shrubs and vines. Specifications The preservation of individual plants is more difficult because heavy �.. eyuipment is generaliy used to remove unwanted vegetation. The points to remember when attem tin to save individual lants are: P g P ' � • Is the plant worth saving? Consider the location,speeies, size,age,vigor, and the work involved.Local govermnents may also have ordinances to save natural vegetation and trees. ! � • Fence or clearly mark areas around trees that are to he saved. It is preferable to keep ground disturbance away from the trees at least as far out as the dripline. ', � Plants need protection from three kinds of injuries: • Canstruction Equipment-This injury can be above or below the ground level. Damage results fram scarring, cutting af roots, and � compaction of the soil. Placing a fenced buffer zone around plants to be saved prior to construc�ion can prevent construction equipznent I � injuries. • G�ade Changes - Changing the natural graund level will alter grades, � which affects the plant's ability to obtain the necessary air, water, and minerals. Minor fills usually do not cause problems although sensitivity between species does vary and should be checked. Trees can typically talerate fill of 6 inches ar less. For shrubs and other �. plants, the fill should be Iess. �, When there are major changes in grade, it may become necessary to � supply air to the roots of plants. This can be done by placing a layer of gravel and a tile systena.over the roots before the fill is made. A tile ' � system protects a tree from a raised grade, The tile system should be �r Volume Il'—Constrzrction Stormwater Pollution Prevention-August 2012 � 4-3 �r i . � 7able 4.1.'[ Source Control BMPs by SWPPP Element � E#ement#1 Etement#2 Element�5 Element�i6 Elemeni#9 Element#11 Efement#12 E lement#13 BMPorEFementName Preserve Establish gta6ilize Protect Control Maintain Managethe ProtectLow VegetationlMark Constrnction Soils Sbpes Poltutants BMPs Project �mp� Clearin Lim4s Access Devela ment BN[P C101: Preserving FEatu►al Vegetation � 8MP C782:8uffer Zones ✓ ✓ � BMP C103:High Visibility Plasfic or Metal f � Fence 8MPC105: ScabilizedConstruction � � Entrance!Exit ' � BMP C166: Wheel Wash ✓ BMP C107: Construction RoadlParking f I � Area Stabiiization 11e BMP C120:Ternporaryand Perrtenent ✓ � Seeding 1"" BMP G721: �lulching ✓ ✓ � BMP C122: Nets and Blankets �/ �/ � BMP C123: Piastic�overing ✓ BMP C124: Sodding ✓ � BMP C125: Topsoiling!Composting ✓ BMP C726: Polyacryla�ride for Soil Erosion � Protectian �!, � BMP C13U: Surfsce Roughening ./ ✓ BMPC131: GradientTerraces ✓ ✓ � � BINPCI4D: DustControl ✓ In BMP C750: MateriaLs On Hand ✓ ✓ ', � BMP G151: Concrete Hand[ing , ✓ 8MP C752: Sawcutfing and Sur[acing � Pollut"son Prevention I � BMP C1i3: Material Delivery,Storage and � Containment � �, BN1P C154: Concrete Washuut Area ✓ � BMP C160: £ertified Erosion and � � Sediment Control Lead I �. BMP C762:Scheduling ✓ � I � ' � � Yolume II—Construction Stornawater Pollution Prevention-August 2012 4-2 � I , � . laid out on the original grade leading from a dry well around the tree trunk. The system should then be covered with small stones to allow air to circulate over the root area. � Lawering the natural ground level can seriously damage trees and shrubs. The highest percentage of the plant roots are in the upper 12 � inches of the soii and cuts of only 2-3 inches can cause serious injury. To protect the roots it may be necessary to terrace the immediate area around the plants to be saved. If roo�s are exposed, construction of � retaining walls may be needed to keep the soil in place, Plants can also be preserved by leaving them on an undisturbed,gently sloping mound. To increase the chances fox suzvival, it is best to limit grade � changes and other soil disturbances to areas outside the dripline af the plant. �' • Excavations -Protect trees and other plants when excavating for �- drainfields,power, water, and sewer lines. Where possible, the trenches shouid be routed around trees and]arge shrubs. When this is not possible, it is best to tunnel under them. This can be done with � hand tools or with power augers. If it is not possible to route the trench around plants to be saved, then the following shauld be obs�rved: �° � Cut as few roots as possible. When you have to cut, cut clean. Paint cut root ends with a wood dressing like asphalt base paint if roots will ' � be exposed for more than 24-hours. � Backfill the trench as soon as possible. Tunnel beneath root systems as close to the center of the main trunk to reserve most of the im ortant fee er roots I �, p P d . Sozne problems that can be encountered with a few specific trees are: � • Maple,Dogwood, Red alder, Western hemlock, Western red cedax, and Douglas fir do not readily adjust ta changes in environm�ent and special care should be taken to pratect these trees. II 1� . The windthrow hazard of Pacific siiver fir and rnadrona is hi h while g � that of Western hemlock is moderate. The danger of windthrow '' � increases where dense stands have been thinned. Other species (unless they are on shallow, wet soils less than 2p inches deep) have a low windthrow�azard. � Cottanwoods, maples, and willows have water-seeking roots. These • can cause trouble in sewer lines and infiltration fields. On the other hand,they thrive in high nnoisture conditions that other trees would � not. • Thinning operations in pure or mixed stands of Grand fir, Pacific silver ' � fir, Noble fr, Sitka spruce, Western red cedar, Western hemlock, Pacific dogwood, and Red alder can cause serious disease problems. Disease can become established through damaged limbs, trunks, roots, � � Yolume II—Constructron Stormwater Pollution Preventian-August Z012 4-4 '', �a ' � and freshiy cut stumps. Diseased and weakened trees are also susceptible to insect attack, � Maintenance Inspect flagged and/or fenced areas regularly to make sure flagging or Standards fencing has not been removed or damaged. Tf the flagging or fencing �, I�as been damaged or visibility reduced, it shall be repaired or � replaced imrnediately and visibility restored. • If tree roots have been exposed or injured, "prune" cleanly with an appropriate pruning saw or lopers directly above the damaged roots '' � and recover with native soils. Treatment of sap flowing trees (fir, hemlock,pine, soft mapies) is not advised as sap forms a natural healing barrier. �_ ' ',, , , '' � , � � ' ! � , , � , � � �' � Yolume II—Canstruction Stormwater Pollution Prevention-August 2012 4-5 � , � BMP C105: Stabilized Construction Entrance / Exit I � Purpose Stabilized Construction entrances are established to reduce the amount of sediment transported onto paved roads by vehicles or equipment. This is � done by constructing a stabilized pad of quarry spalls at entrances and � exits for construction sites. Conditions of Use Construction entrances shall be stabilized wherever traffic will be entering or leaving a construction site if paved roads or other paved areas are � within 1,000 feet of the site. For residential constiuction provide stabilized construction enhances for � each residence,rather than only at the main subdivision entrance. Stabilized surfaces shall be of sufficient length/width to provide vehicle access/parking,based on lot size/configuration. � On large commercial,highway, and road projects,the designer should include enough extra materials in the contract to allow for additional R" stabilized entrances not shown in the initial Construction SWPPP. It is 1� difficult to determine exactly where access to these projects will take place; additional materials will enable the contractor to install them where !" needed. �` Design and See Fi�ure 4.1.1 for details. Note: the 100' minimum length of the ' �, Installation entrance shall be reduced to the maximum practicable size when the size � Specifications or configuration of the site does not allow the full length(100'). Construct stabilized construction entrances with a 12-inch thick pad of 4- �' inch to 8-inch quarry spalls, a 4-inch course of asphalt heated base �, (ATB), or use existing pavement. Do not use crushed concrete, cement, or calcium chloride for construction entrance stabilization because these ' �° products raise pH levels in stormwater and concrete discharge to surface �, waters of the State is prohibited. �' �, A separation geotextile shall be placed under the spalls to prevent fine sediment from pumping up into the rock pad. The geotextile shall meet �' the following standards: ' � Grab Tensile Strength{AST'M D4751) 200 psi min. Grab Tensile Elongation(ASTM 30%max. D4632) � � Mullen Burst Strength(ASTM 400 psi min. D3786-80a) � � AOS (ASTM D4751) 20-45 (U.S. standard sieve � size) • Consider early installation of the first lift of asphalt in areas that will � paved; this can be used as a stabilized entrance. Also consider the � installation of excess concrete as a stabilized entrance. During large concrete pours, excess concrete is often available for this purpose. �"' � Yolume II—Construction Stormwater Pollution Prevention-August 2012 I' � 4-7 � I � � • Fencing(see BMP C 103) shall be installed as necessary to restrict traffic to the construction entrance. I � • Whenever possible, the entrance shall be constructed on a firm, �' compacted subgrade. This can substantially increase the effectiveness , � of the pad and reduce the need for maintenance. � • Construction entrances should avoid crossing existing sidewallcs and back of walk drains if at all possible. If a construction entrance must �' � cross a sidewalk or back of walk drain, the full length of the sidewalk � and back of walk drain must be covered and protected from sediment leaving the site. ' � Maintenance Quarry spalls shall be added if the pad is no longer in accordance with ' �° Standards the specifications. ', � • If the entrance is not preventing sediment from being tracked onto � pavement, then alternative measures to keep the streets free of sediment shall be used. This may include replacement/cleaning of the I�' �. existing quarry spalls, street sweeping, an increase in the dimensions � of the entrance, or the installation of a wheel wash. • Any sediment that is tracked onto pavement shall be removed by ' �' shoveling or street sweeping. The sediment collected by sweeping �r shall be removed ar stabilized on site. The pavement shall not be cleaned by washing down the street, except when high efficiency I �' sweeping is ineffective and there is a threat to public safety. If it is � necessary to wash the streets, the construction of a small sump to contain the wash water shall be considered. The sediment would then �" be washed into the sump where it can be cvntrolled. � • Perform street sweeping by hand or with a high efficiency sweeper. Do '' �, not use a non-high efficiency mechanical sweeper because this creates � dust and throws soils into storm systems or conveyance ditches. • Any quarry spalls that are loosened from the pad, which end up on the I � roadway shall be removed immediately. �' • If vehicles are entering or exiting the site at points other than the ��, �, construction entrance(s), fencing (see BMP C 103) shall be installed to control traffic. i. • Upon project completion and site stabilization, all construction ' �^ accesses intended as permanent access for maintenance shall be �, permanently stabilized. � - � �" i� Volume II—Construction Stormwater Pollutiorr Prevention-August 2012 �' �, 4-8 � i � � � wr � Driveway sha6 meet the requirements of the �w P��9��Y 1 il is recommended that the � entrance be croumed so that runolf drains off the pad r�S�„a'i �,}��tir: � � '=�, -}fi � � Instail ddveway culvert iF there is a roadside dich present � 4'–8'auam spalis i Geote�ile �—� .- �° `�'� � 12"min.thiclmess r` � ��,,�� "" Provide tul width of mgress/egre.ss area Figure 4.1.1 —Stabilized Construction Entrance � Approved as Ecology has approved products as able to meet the requirements of BMP Equivalent C 105. The products did not pass through the Technology Assessment � Protocol—Ecology(TAPE)process. Local jurisdictions may choose not to accept this product approved as equivalent, or may require additional testing prior to consideration for local use. The products are available for � review on Ecology's website at httQ//www.ecy.wa.gov/,�rograms/wq/stormwater/newtech/equivalent.html � � � � � ' � � Volume II—Constr-uction Stormwater Pollution Prevention-August 2012 I! �, 4-9 � ' �. I , � i , � BMP C120: Temporary and Permanent Seeding � Purpose Seeding reduces erosion by stabilizing exposed soils. A well-established vegetative cover is one of the most effective methods of reducing erosion. Conditions of Use Use seeding throughout the project on disturbed areas that have reached � final grade or that will remain unworked for more than 30 days. The optimum seeding windows for western Washington are April 1 � through June 30 and September 1 through October l. Between July 1 and August 30 seeding requires irrigation unti175 percent grass cover is established. � Between October 1 and March 30 seeding requires a cover of mulch with straw or an erosion control blanket unti175 percent grass cover is ' � established. Review all disturbed areas in late August to early September and complete �� all seeding by the end of September. Otherwise,vegetation will not � establish itself enough to provide more than average protection. • Mulch is required at all times for seeding because it protects seeds �" from heat, moisture loss, and transport due to runoff. Mulch can be � applied on top of the seed or simultaneously by hydroseeding. See BMP C 121: Mulchin� for specifications. � • Seed and mulch, all disturbed areas not otherwise vegetated at final site stabilization. Final stabilization means the completion of all soil disturbing activities at the site and the establishment of a permanent � vegetative cover, or equivalent permanent stabilization measures (such as pavement,riprap, gabions or geotextiles) which will prevent erosion. � Design and Seed retention/detention ponds as required. Installation Install channels intended for vegetation before starting major � Specifications earthwork and hydroseed with a Bonded Fiber Matrix. For vegetated channels that will have high flows,install erosion control blankets I�' �, over hydroseed. Before allowing water to flow in vegetated � channels,establish 75 percent vegetation cover. If vegetated channels cannot be established by seed before water flow; install sod I� � in the channel bottom—over hydromulch and erosion control � blankets. � � Yolume II–Consiruction Stormwater Pollution Prevention-August 2012 I' �, 4-13 �►. � , A" • Confirm the installation of all required surface water control measures to prevent seed from washing away. . Hydroseed applications shall include a minimum of 1,500 pounds per ' '� acre of mulch with 3 percent tackifier. See BMP C121: Mulchin� for specifications. �. • Areas that will have seeding only and not landscaping may need coinpost or meal-based mulch included in the hydroseed in order to � establish vegetation. Re-install native topsoil on the disturbed soil surface before application. • When installing seed via hydroseeding operations, only about 1/3 of � the seed actually ends up in contact with the soil surface. This reduces the ability to establish a good stand of grass quickly. To overcome this, consider increasing seed quantities by up to 50 percent. � • Enhance vegetation establishment by dividing the hydromulch operation into two phases: � 1. Phase 1- Install all seed and fertilizer with 25-30 percent mulch and tackifier onto soil in the first lift. 2. Phase 2-Install the rest of the mulch and tackifier over the first lift. ' � Or, enhance vegetation by: 1. Installing the inulch, seed, fertilizer, and tackifier in one lift. � 2. Spread or blow straw over the top of the hydromulch at a rate of 800-1000 pounds per acre. I 1" � 3. Hold straw in place with a standard tackifier. Both of these approaches will increase cost moderately but will greatly �" improve and enhance vegetative establishment. The increased cost �r may be offset by the reduced need for: �, • Irrigation. �, • Reapplication of mulch. I � • Repair of failed slope surfaces. �, This technique works with standard hydromulch (1,500 pounds per acre minimum) and BFM/MBFMs (3,000 pounds per acre minimum). � • Seed may be installed by hand if: • Temparary and covered by straw,mulch, or topsoil. I � • Permanent in small areas (usually less than 1 acre)and covered � with mulch, topsoil, or erosion blankets. � � • The seed mixes listed in the tables below include recommended mixes � for both temporary and permanent seeding. � Yolume II—Construction Stormwater Pollution P�evention-August 2012 4-14 � � _ � � • Apply these mixes, with the exception of the wetland mix, at a rate of 120 pounds per acre. This rate can be reduced if soil amendments or slow-release fertilizers are used. � • Consult the local suppliers or the local conservation district for their recommendations because the appropriate mix depends on a � variety of factors, including location, exposure, soil type, slope, and expected foot traffic. Alternative seed mixes approved by the local authority may be used. �. • Other mixes may be appropriate, depending on the soil type and hydrology of the area. � • Table 4.1.21ists the standard mix for areas requiring a temporary vegetative cover. � � Table 4.1.2 I � Temporary Erosion Control Seed Mix � %Wei ht %Puri %Germination Chewings or annual blue grass 40 98 90 ' �, Festuca rubra var. commutata or � �'oa anna Perennial rye- 50 98 90 Lolium erenne � Redtop or colonial bentgrass 5 92 85 A ostis alba or A ostis tenuis White dutch clover 5 98 90 � Tri olium re ens ' � • Table 4.13 lists a recominended mi�c for landscaping seed. �r I � Table 4.1.3 � Landscaping Seed Mix %Wei ht °/a Puri %Germin$tion ' � Perennial rye blend 70 98 90 ' �` Lolium erenne ' � Chewings and red fescue blend 30 98 90 � Festuca rubra var. commutata or Festuca rubra i � �. � Yolume II—Construction Storrrawater Pollutzon Prevention-August 2012 4-15 ', � I ' � • Table 4.1.4 lists a turf seed mix for dry situations where there is no need for watering. This mix requires very little maintenance. � Table 4.1.4 .� Low-Growing Turf Seed Mix % Wei ht %Puri %Germination Dwarf tall fescue (several varieties) 45 98 90 Festuca arundinacea var. � Dwarf perennial rye (Barclay) 30 98 90 �olium erenne var. barcla � Red fescue 20 98 90 Festuca rubra Colonial bentgrass 5 98 90 � A rostis tenuis • Table 4.1.5 lists a mix for bioswales and other intern�ittently wet areas. � Table 4.1.5 � Bioswale Seed Mix* °/a Wei ht %Puri %Germinarion � Tall or meadow fescue 75-80 98 90 � Festuca arundi�acea or Festuca elatior I �" Seaside/Creeping bentgrass 10-15 92 85 � A rostis alustris Redtop bentgrass 5-10 90 80 ' �" A rostis alba or A rostis i antea � *Modified Briargreen, Irtc. Hydroseeding Guide Wetlands Seed M'ix � � � � , t� � Polume II—Construction Stormwater Poldution Prevention-August 2012 �' � 4-16 � 1 � � �' • Table 4.1.6 lists a low-growing,relatively non-invasive seed mix appropriate for very wet areas that are not regulated wetlands.Apply this mixture at a rate of 60 pounds per acre. Consult Hydraulic Permit .�. Authority (HPA) for seed mixes if applicable. � � Table 4.1.6 Wet Area Seed Mix* %Wei ht %Puri %Germination � Tall or meadow fescue 60-70 98 90 Festuca arundinacea or � Festuca elatior Seaside/Creeping bentgrass 10-15 98 85 A ostis alustris �' Meadow foxtail 10-15 90 80 Ale ocurus ratensis Alsike clover 1-6 98 90 � Tri olium h bridum Redtop bentgrass 1-6 92 85 A rostis alba � *Modifted Briargreen, Inc. Hydroseeding Guide Wetlands Seed Mix � • Table 4.1.71ists a recommended meadow seed mix for infrequently maintained areas or non-maintained areas where colonization by native plants is desirable. Likely applications include rural road and utility right-of-way. Seeding should take place in September or very early �, October in order to obtain adequate establishment prior to the winter months. Consider the appropriateness of clover, a fairly invasive species, in the mix. Amending the soil can reduce the need for clover. � Table 4.1.7 � Meadow Seed Mix %Wei ht %Puri %Germination Redtop or Oregon bentgrass 20 92 85 I � A rostis alba or A rostis g g ore onensis � Red fescue 70 98 90 Festuca rubra White dutch clover 10 98 90 Tri olium re ens �, � � Yolume II—Construction Stormwater Pollution Prevention-August 2012 I � 4-17 �_ � � • Roughening and Rototilling: • The seedbed should be firm and rough.Roughen all soil no matter � what the slope. Tz-ack walk slopes before seeding if engineering purposes require compaction. Backblading or smoothing of slopes greatar than 4H:1V is not allowed if they are to be seeded. � • Restoration-based landscape practices require deeper incorporation than that provided by a simple singie-pass ratotilling treatment. Wherever practical, initially rzp the subgrade to improve long-term �, permeability, infiltration, and water inflow qualities. At a minimum, permanent areas shall use soil amendments to achieve � organic matter and permeability performance defined in engineered soil/landscape systerr�s. For systems that are deeper than 8 inches complete the rototilling process in multiple lifts, or �" prepare the engineered soil system per specificatzons and place to �� achieve the specified depth. • Fertilizers: � . Conducting soil tests to determine the exact type and quantity of fertilizer is reconnmended. This will prevent the over-app�ication � of fertilizer. • Organic matter is the most appropriate form of fertilizer because it �, provides nutrients{including nitrogen,phosphox-as, and potassium) � in the ieast water-solub�e form. • In general, use 10-4-6 N-P-K(z�itrogen-phosphorus-potassiurn) �" fertilizer at a rate of 90 pounds per acre. Always use slow-release � fertilizers because they are more efficient and have�'ewer environmental impacts. Do not add�ertilizer to the hydromulch r machine, or agitate, more than 20 minutes before use. Too much agitation destroys the slow-release coatuig. • There are nuznerous produc�s available that take the place of , � chemical fertilizers. These include several with seaweec�extracts that are beneficial to soil microbes and organisms. If 100 percent '' � cottonseed meal is used.as the mulch in hydroseed,chemical � fertilizer may not be necessary. Cattonseed meai provides a good source of long-term, slow-release, available nitrogen. � • Bonded Fiber Matrix and Mechanically Bonded Fiber Matrix: �r • 4n steep slopes use Bonded Fiber Matrix(BFM) or Mechanically I �. Bonded Fiber Matrix (MBFM)products. Appiy BFM/MBFM � products at a minimum rate of 3,000 pounds per acre of mulch with approximately 10 percent tackifier. Achieve a minimum of 95 ' � percent soil eoverage during application. Numerous products are �, available commearcially. Installed pxoducts per manufacturer's instructions. Most products require 24-3b haurs to cure before � rainfall and cannot be installed on wet or saturated sails. Yolume II—Construction Stormwater Pollution Prevention-.August 2012 I! �,, 4-I8 , �. i � � Generally, products come in 40-50 pound bags and include all necessary ingredients except for seed and fertilizer. � • BFMs and MBFMs provide good altematives to blankets in most areas requiring vegetation establishment. Advantages over � blankets include: • BFM and MBFMs do not require surface preparation. • Helicopters can assist in installing BFM and MBFMs in remote � areas. • On slopes steeper than 2.SH:1V,blanket installers may require ' � ropes and harnesses for safety. �° • Installing BFM and MBFMs can save at least$1,000 per acre compared to blankets. � Marntenance Reseed any seeded areas that fail to establish at least 80 percent cover StandaYds (100 percent cover for areas that receive sheet or concentrated flows). If � reseeding is ineffective,use an alternate method such as sodding, mulching, or nets/blankets. If winter weather prevents adequate grass growth,this time limit may be relaxed at the discretion of the local � authority when sensitive areas would otherwise be protected. � � • Reseed and protect by mulch any areas that experience erosion after achieving adequate cover. Reseed and protect by mulch any eroded � area. • Supply seeded areas with adequate moisture,but do not water to the extent that it causes runoff. � Approved as Ecology has approved products as able to meet the requirements of BMP Equivalent C 120. The products did not pass through the Technology Assessment � Protocol—Ecology(TAPE)process. Local jurisdictions may choose not to �' accept this product approved as equivalent, or may require additional testing prior to consideration for local use. The products are available for review on � Ecology's website at �"� http://www.ecy.wa.g°v/pro�xams/wq/stormwater/newtech/equivalent.html ' �,,. �` BMP C121: Mulching � Purpose Mulching soils provides immediate temporary protection from erosion. Mulch also enhances plant establishment by conserving moisture, holding fertilizer, seed, and topsoil in place, and moderating soil temperatures. �' There is an enormous variery of mulches that can be used. This section � discusses only the most common types of mulch. �' Conditions of Use As a temporary cover measure, rnulch should be used: �, • For less than 30 days on disturbed areas that require cover. • At all times for seeded areas, especially during the wet season and , � Yolume II—Constructzon Stormwater Pollution Prevention-August 2012 4-19 '' � i � � Standards accumulation during and after each runoff producing rainfall. Sediment shall be removed when it reaches one half the height of the dam. � Antici ate submer ence and de osition above the triangular silt dam • p g 1� � and erosion from high flows around the edges of the dam. Imrnediately repair any damage or any undercutting of the dam. BMP C209: Outlet Protection � Purpose Outlet protection prevents scour at conveyance outlets and minimizes the potential for downstream erosion by reducing the velocity of concentrated � stonnwater flows. Conditions of use Outlet protection is required at the outlets of all ponds,pipes, ditches, or � other conveyances, aa�d where runoff is conveyed to a natural or manmade drainage feature such as a stream,wetland, lake, or ditch. Design and The receiving channel at the outlet of a culvert shall be protected from � Installation erosion by rock lining a minimum of 6 feet downst�eam and extending up Specifi�ations the cham�el sides a minimum of 1—foot above the maximum tailwater elevation or 1-foot above the crown,whichever is higher. For large pipes � (more than 18 inches in diameter), the autlet protection lining of the channel is lengthened to four times the diaineter of the culvert. � • Standard wingwalls, and tapered outlets and paved channels should also be considered when appropriate for permanent culvert outlet protection. (See WSDOT Hydrauiic Manual, available through WSDOT Engineering Publications). �. • Oxganic or synthetic erosion blankets, with or without vegetation, are usually more effective than rock, cheaper, and easier to install. � Materials can be chosen using manufacturer product specifications, ASTM test results are available for most products and the designer can ' � choose the correct material far the expected flow. �, • With low flows, vegetation(including sod) can be effective. I' � • The following guidelines shall be used for riprap outlet protection: �, 1. If the discharga velocity at the outlet is less than 5 fps (pipe slope less than 1 percent), use 2-znch to 8-inch riprap. Minimum � thickness is 1�foot. 2. For 5 to 10 fps discharge velocity at the outlet(pipe slope less than 3 percent),use 24-inch to 48-inch riprap. Minim�un thickness is 2 � feet. 3. For outlets at the base of steep slope pipes{pipe slope greater than 10 percent), an engineered energy dissipater shall be used. � • Filter fabric or erosion contrai blankets should always be used under riprap to prevent scour and channel erosion. � rYolume II—Construction Stormwater Pollutron Prevention-August 2012 4-78 I � � � � • New pipe outfalls can provide an opportunity for low-cost fish habitat improvements. For example, an alcove of low-velocity water can be created by constructing the pipe outfall and associated energy � dissipater back from the stream edge and digging a channel, over- widened to the upstream side, from the outfall. Overwintering juvenile � and migrating adult salmonids may use the alcove as shelter during high flows. Bank stabilization,bioengineering, and habitat features may be required for disturbed areas. This work may require a HPA. � See Volume V for more information on outfall system design. Maintenance • Inspect and repair as needed. Standards . Add rock as needed to maintain the intended function. � • Clean energy dissipater if sediinent builds up. � BMP C220: Storm Drain Inlet Protection � Purpose Storm drain inlet protection prevents coarse sediment from entering drainage systems prior to permanent stabilization of the disturbed area. Conditions of Use Use storm drain inlet protection at inlets that are operational before � permanent stabilization of the disturbed drainage area. Provide protection for all storm drain inlets downslope and within 500 feet of a disturbed or construction area,unless conveying runoff entering catch basins to a �. sediment pond ar trap. Also consider inlet protection for lawn and yard drains on new home � construction. These small and numerous drains coupled with lack of gutters in new home construction can add significant amounts of sediment into the roof drain system. If possible delay installing lawn and yard drains � until just before landscaping or cap these drains to prevent sediment from entering the system until completion of landscaping. Provide 18-inches of ' �, sod around each finished lawn and yard drain. fr Table 4.2.21ists several options for inlet protection. All of the methods for storm drain inlet protection tend to plug and require a high frequency of I �' maintenance. Limit drainage areas to one acre or less. Possibly provide �r emergency overflows with additional end-of-pipe treatment where stormwater ponding would cause a hazard. � � � ,� � Volume II—Construction Stormwater Pollution Prevention-August 2012 II� �, 4-79 I � � , I � - Table 4.2.2 Storm Drain Inlet Protection � Applicable for Type of lnlet Emergency Paved/Earthen � Protection Overf(ow Surfaces Conditions of Use Drop Tnlet Protection Excavated d�op inle� Yes, Earthen Applicable for heavy flows. Easy � protection temparary to ima�ntain. Large area flooding will Requirement: 30'X 30'lacre occur. Block and gravel drop Yes Paved or Earthen Applicable for.h.eavy concentrated � inlet pxotection flows.Will.not pond. Gxavel and wire drop No Applicable£ox heavy concentrated ` inlet protection flows. Will pond.Can withstand � ` traffic. ` Catch basin filtexs Yes Paved or Earthen �cequent maintenance re uired. Curb In1et Protection � Gurb inlet protection: Srn.all capacity Paved Used for sturdy, nnore compact with a wooden weir .; overflow _ ; anstallation. Block and gravel curb Yes Paved Sturdy,but limited filtration :: � inlet protection Cui�ert Inlet Proteetion:. Culvert inlet sedimen� 18 month'expected life.: � trap Design and Excavated Drop.Inlet Protection -An excavated impoundment around the � Installation storr�i drain. Sediment settles out of the stormwater prior to entering the Specifications storm drain. � • Provide a depth of 1-2 ft as measured from the crest of the inlet structure. � • Slope sides af excavation no steeper than 2H:1 V. • Minimum volume of excavation 35 cubic yards. • Shape basin to fit site with Iongest dimension oriented toward the � longest inflow area. • Install provisions for draining to prevent standing water problems, � • Clear the area of all debris. • Grade the approach to the inlet uniformly. � • Drill weep holes into the side of the inlet. • Protect weep holes with screen wire and washed aggregate. � • Seal weep holes when removing structure and stabilizing area. �"' � Valurize II—Construction Stormwater Pollution Prevention-August 2012 ' �. 4-80 � � i ' , �""' • Build a temporary dike, if necessary, to the down slope side of the structure to prevent bypass flow. Block and Gravel Filter-A barrier formed around the storm drain inlet "` with standard concrete blocks and gravel. See Fi�ure 4.2.8. � • Provide a height of 1 to 2 feet above inlet. • Recess the first row 2-inches into the ground for stability. � • Support subsequent courses by placing a 2x4 through the block opening. • Do not use mortar. � • Lay some blocks in the bottom row on their side for dewatering the paol. � • Place hardware cloth or comparable wire mesh with '/2-inch openings over all block openings. � • Place gravel just below the top of blocks on slopes of 2H:1 V or flatter. • An alternative design is a gravel donut. � • Provide an inlet slope of 3H:1 V. • Provide an outlet slope of 2H:1 V. • Provide al-foot wide level stone area between the structure and the � inlet. • Use inlet slope stones 3 inches in diameter or larger. � • Use gravel '/�- to 3/a-inch at a minimum thickness of 1-foot for the outlet slope. � ' � � ' , � ' � Volume II—Construction Stormwater Pollution Prevention-Ar�gust 2012 ' �. 4-81 � ' � Plan View A Drain °C�°°°° �;�° � "' ,,�s,o l,>` �= � Grate--- � o��C��{Qo o,o`�__o�oCO�o°o"<�J°`� �°��a�'� � O ��O a�G°��_caC C?ao��°��° �Y, `�.�p° ��C'5��Z��C�d'�c�p C��04�O !7�b(l�o oo°n� o �OLI �7�oofl�°e� Wo 0 _ �o�'�`,�y�n ^C�O od p�!a • ' \/_- °`a° c��,��o � da`J��o� Cancrete � �oC� — . _ �(v°C�°Jo l� ��Li , �_> o�� B�o�k '�.�°G� °��°�° I /�� >°, nS\��po'p°� 'J _ % 4�Y„�10�j o �� l[i n n O=U 14,� t�C��1Qo�� !,�� ,C��ar.o � '�:�..�� J �� ; .�o�000 �_� = oo.�v •�k C��qoo°oo °��.� � �o Gravel o t]C O� ��._r_�^�;C 4�; °°��'�JOC•�o Backfill c�a�o(l °p�-- 7caol� �O=�UI> (r��o�., O QO- o°�'fi �°�00 O � '�-`��?c�`��°G`�� Q'�°o�Cp>�,Q��JO,o�O o no� ,��-p r,� ac��a�o� �> 0��•��,o�; ��e `��°c� c��a°o o�j 0.->Q��p��"r-�S 00 C�°�>�r.��`J� � o W � `r� �' A � �y� y\�� , �. Section A — A Concrete Black Wire Screen or � Filter Fabric Gravel Backfill� �pverflow � � Water Ponding Height p��o00 , --� o ° , �� a_ o �Y''�jo �� Water��_ � � (��-s�'��;�,�� -�, (��b��C"° I ' 4£��i�c_�'oo vo�_o�_..-�c- ='��;�T��%� � � •_ / / �%I%�//.; i\��\�j\�j\�j\�j\�j\ — �j\�j\�j\�j\�j��/\�i; � �,�/i\��\\��\\��\\��\\�� Drop Inlet \//�\j��\//�\//��/ '.�/i�//�/��//� ��//��/\��/��/� ��\/j, / \//i// �— � Notes: 1.Drop inlet sediment barriers are to be used for small,nearly level drainage areas.(less than 5%) ' 2_Excavate a basin of sufficient size adjacent to the drop iniet. 3.The top of the structure(ponding height)must be well below the ground elevation downslope to prevent runoff from bypassing the inlet.A temporary dike may be necessary on the downslope side of the structure. � Figure 4.2.8–Block and Gravel Filter � Gravel and Wire Mesh Filter-A gravel barrier placed over the top of the � cture does not rovide an overflow. inlet. This stru p '' � • Use a hardware cloth or comparable wire mesh with '/2-inch openings. � • Use coarse aggregate. � • Provide a height 1-foot or more, 18-inches wider than inlet on all � sides. • Place wire mesh over the drop inlet so that the wire extends a �a minimum of 1-foot beyond each side of the inlet structure. • Overlap the strips if more than one strip of rnesh is necessary. I �.. Volume II–Construction Stormwater Pollution Prevention-August 2012 4-82 �. � i � • Place coarse aggregate over the wire mesh. • Provide at least a 12-inch depth of gravel over the entire inlet opening and extend at least 18-inches on all sides. w Catchbasin Filters—Use inserts designed by manufacturers for � construction sites. The limited sediment storage capacity increases the amount of inspection and maintenance required,which may be daily for heavy sediment loads. To reduce maintenance requirements combine a � catchbasin filter with another type of inlet protection. This type of inlet protection provides flow bypass without overflow and therefore may be a better method for inlets located along active rights-of-way. ', � • Provides 5 cubic feet of storage. • Requires dewatering provisions. � • Provides a high-flow bypass that will not clog under normal use at a construction site. • Insert the catchbasin filter in the catchbasin just below the grating. �r'' Curb Inlet Protection with Wooden Wei�—Barrier formed around a curb inlet with a wooden frame and gravel. � • Use wire mesh with '/z-inch openings. � • Use extra strength filter cloth. • Construct a frame. • Attach the wire and filter fabric to the frame. �y • Pile coarse washed aggregate against wire/fabric. • Place weight on frame anchors. � Block and Gravel Curb Inlet Protection—Barrier formed around a curb inlet with concrete blocks and gravel. See FiQUre 4.2.9. � • Use wire mesh with '/2-inch openings. • Place two concrete blocks on their sides abutting the curb at either side of the inlet opening. These are spacer blocks. � • Place a 2x4 stud through the outer holes of each spacer block to align the front blocks. � • Place blocks on their sides across the front of the inlet and abutting the spacer blocks. • Place wire mesh over the outside vertical face. � �° Pile coarse a re ate a ainst the wire to the to of the barrier. � gg g g P �" Curb and Gutter Sediment Barrier—Sandbag or rock berm(riprap and � aggregate) 3 feet high and 3 feet wide in a horseshae shape. See Figure 4.2.10. �" � Yolume II—Construction Stormwater Pollution Prevention-August 2012 4-83 � � ' III �„ • Construct a horseshoe shaped berm, faced with coarse aggregate if using riprap, 3 feet high and 3 feet wide, at least 2 feet from the inlet. ' � • Construct a horseshoe shaped sedimentation trap on the outside of the berm sized to sediment trap standards for protecting a culvert inlet. � Maintenance • Inspect catch basin filters frequently, especially after storm events. Standards Clean and replace clogged inserts. For systems with clogged stone filters: pull away the stones from the inlet and clean or replace. An �" alternative approach would be to use the clogged stone as fill and put fresh stone around the inlet. • Do not wash sediment into storm drains while cleaning. Spread all excavated material evenly over the surrounding land area or stockpile �'" and stabilize as appropriate. � Approved as Ecology has approved products as able to meet the requirements of BMP Equivalent C220. The products did not pass through the Technology Assessment Protocol—Ecology (TAPE)process. Local jurisdictions may choose not � to accept this product approved as equivalent, or may require additional testing prior to consideration for local use. Tl�e products are available for review on Ecology's website at http•//www ec�wa.gov/pro�rams/wqlstormwater/newtech/equivalent.html �. ' � � � , ' � , � Volume II—Construction Stormwater Pollution Prevention-August 2012 4-84 � i � �' Plan View � Back of Sidewalk /�_- — Catch Basin ■" ------- ---- � i � 2x4 Wood Stud � Back of Curb ' Concrete Block Curb Inlet � __.... _.__. ---- , __ _ ,- u �: �� , , _ ,, � . � ; �__ . a. ; — � � _ , � ___ _ . . , ; ; � , _ . :� i , -_ - - , .:.: ,, , , : _ _ �, _ - _ - - _ � "- � - �. _ - - - �; ._ ,< . _ ,. ,_.:. , - ,_: � Wire Screen or ` Filter Fabric A Concrete Block � Section A - A 3�`'Rrain Gravel � (2omm) '/<"Drain Gravel (20mm) � Ponding Height /�'`Goncrete Block �' Overflow=_ / I � '-.,..�. --, 1 ---- �'" - ------ _ '_ ---_ ----- Curb Inlet � Wire Screen or ----- ---- .--� Filter Fabnc I �` Cafch Basin � 4 Wood Stud (100x50 Timber Stud) R'" IVOTES: � 1.Use bEock and gravel type sediment barrier when curb inlet is[ocated in gently slopfng street segment, where water can pond and aliow sediment to separate from runaff. 2. Barrier shal!allow for overflow from severe storm event. I � 3. fnspect barriers and remove sediment after each storm event. Sediment and gravel must be removed � from the trave{ed way immediatefy. I� �, Figure 4.2.9- Blvck and Gravel Curb Inlet Protection �w li � . Yolume II-Consti�uction 8tormwater Pollution Preventron-August 2012 4-85 � I i, ' � � Plan View ,� ---- � Back of Sidewalk � Catch Basin Burlap SacEcs to Qverlap onto Curb � Curb Infet __— Back of Curb� , ;� ' ---_ -----._, ..___ � ---- ----._ � � � � � � „ ; . __ ;� �i --- , � RUNOFF :-,,, ,i :_....._.... ....._. ......... ......... _---- �� , . _...... .. .._. i ' � . , , � �. .. , , - , � � ;� + , - -_.. _ _ _ , RUNOF� SP[LLWAY 1 ' � "�, iYw /. •:. i �%i �� ;i��'�, i� ��:-;//i � i \ / i :l / i� ,�, � 1 `. �/% i ' '�%' � Gravei Filled Sandbags `�-_` ��/ Stacked Tightly >.:' - __- -- �" NOTES: 1.Place curb type sediment barriers on gently sloping street segments,where water can pond and alIow � sediment to separate frozn zunoff. 2.Sandbags of either burlap or woven'geotextile'fabric,are filled with gravel,iayered and packed tightly. 3.Leave a one sandbag gap in the top row to grovide a spillway for over#low. � 4.Inspect barriers and remove sediment after each storm event.Sediment and gravel must be removed from the traveled way immediately. Figure 4.2.10—Curb and Gutter Barrier �, i 1 1 � Volume II—Construction Stormwater Pollution Prevention-August 2012 4-86 � ' ' - i�;-=�:'-`:;a , ... � , � � , � � BMP C233: Silt Fence � Pur ose Use of a silt fence reduces the trarLS ort of coarse sediment from a P p construction site by providing a temporary physical barrier to sediment � and reducing the runoff velocities of overland flow. See Figure 4.2.12 for details on silt fence construction. Conditions of Use Silt fence may be used downslope of all disturbed areas. �� • Silt fence shall prevent soil carried by runoff water from going beneath,through, or over the top of the silt fence,but shall allow the water to pass through the fence. �. • Silt fence is not intended to treat concentrated flows, nor is it intended to treat substantial amounts of overland flow. Convey any �^ concentrated flows through the drainage system to a sediment pond. • Do not construct silt fences in streams or use in V-shaped ditches. Silt � fences do not provide an adequate method of silt control for anything deeper than sheet or overland flow. � �. Yolume II—Construction Stormwater Pollution Prevention-August 2012 ' �, 4-88 �r_ � A�'' Joints in(ilter fabric shall be spliced at posts. Use staples,wire rings or 2"x2"by 14 Ga.wire or equivalent to attach fabric to posts equivalent, if standard –��---- --� strength fabric used � I I � � /�� ; Filter fabric I I ' -" , N � � I „ � I I ; : i _'=� i � – – � ` �, =in=iu= –u ��ji 'i,- i .. ( �,�l��Ili�iil�Ii,�II1 I I �U;��III II �I-I�1 II-, �1=,ill� IILUi��I ' - - c I �-- 6'max— �-? � ``�–Minimum 4"x4"trench `� , il��'J�� E � I � i � N Jj I ' Backfill trench with native soil/ �- —� Post spacing may be increased � or 3/4"-1.5"washed gravel / � to 8'if wire backing is used � 2"x2"wood posts,steel fence posts,or equivalent � Figure 4.2.12—Silt Fence Design and • Use in combination with sediment basins or other BMPs. � Installation Ma�cimum slope steepness (normal (perpendicular) to fence line) Specifications • 1 H:1 V. � • Maximum sheet or overland flow path length to the fence of 100 feet. • Do not allow flows greater than 0.5 cfs. � • The geotextile used shall meet the following standards. All geotextile properties listed below are minimum average roll values (i.e., the test result for any sampled roll in a lot shall meet or exceed the values � shown in Table 4.2.3): Table 4.2.3 ' � Geotextile Standards Polymeric Mesh AOS 0.60 mm maximum for slit film woven(#30 sieve).0.30 (ASTM D4751) mm maximum for all other geotextile types(#50 sieve). ' �"" 0.15 mm minimum for all fabric types(#100 sieve). �" Water Permittivity 0.02 sec minimum � � (ASTM D4491) � Grab Tensile Strength 1801bs.Minimum for extra strength fabric. (ASTM D4632) 1001bs minimum for standard strength fabric. � Grab Tensile Strength 30%maximum I� (ASTM D4632) Ultraviolet Resistance 70%minimum I � (ASTM D4355) � � • Support standard strength fabrics with wire mesh, chicken wire, 2-inch x 2-inch wire, safety fence, or jute mesh to increase the strength of the � Volume II—Construction Stormwater Pollution Prevention-August 2012 ' � 4-89 I � � fabric. Silt fence materials are available that have synthetic mesh backing attached. � • Filter fabric material shall contain ultraviolet ray inhibitors and stabilizers to provide a minimum of six months of expected usable construction life at a temperature range of 0°F. to 120°F. �, • One-hundred percent biodegradable silt fence is available that is strong, long lasting, and can be left in place after the project is � completed, if permitted by local regulations. • Refer to Fi�;ure 4.2.12 for standard silt fence details. Include the following standard Notes for silt fence on construction plans and � specifications: 1. The contractor shall install and maintain temporary silt fences at � the locations shown in the Plans. 2. Construct silt fences in areas of clearing, grading,or drainage prior to starting those activities. �, 3. The silt fence shall have a 2-feet min. and a 2'/2-feet max. height above the original ground surface. � 4. The filter fabric shall be sewn together at the point of manufacture to fortn filter fabric lengths as required. Locate all sewn seams at support posts. Alternatively, two sections of silt fence can be � overlapped,provided the Contractor can demonstrate, to the satisfaction of the Engineer, that the overlap is long enough and that the adjacent fence sections are close enough together to I � prevent silt laden water from escaping through the fence at the overlap. �" 5. Attach the filter fabric on the up-slope side of the posts and secure �r. with staples,wire, or in accordance with the manufacturer's recommendations. Attach the filter fabric to the posts in a manner ' �' that reduces the potential for tearing. �" 6. Support the filter fabric with wire or plastic mesh, dependent on �' �, the properties of the geotextile selected for use. If wire or plastic �� mesh is used, fasten the mesh securely to the up-slope side of the posts with the filter fabric up-slope of the mesh. � 7. Mesh support, if used, shall consist of steel wire with a maximum mesh spacing of 2-inches, or a prefabricated polymeric mesh. The strength of the wire or polymeric mesh shall be equivalent to or �" greater than 180 lbs. grab tensile strength. The polymeric mesh �►� must be as resistant to the same level of ultraviolet radiation as the filter fabric it supports. � 8. Bury the bottom of the filter fabric 4-inches min.below the ground surface. Backfill and tamp soil in place over the buried portion of the filter fabric, so that no flow can pass beneath the fence and � Volume II—Construction Stormwater Pollution Prevention-August 2012 4-90 � � � � scouring cannot occur. When wire or polymeric back-up support mesh is used, the wire or polymeric mesh shall extend into the ground 3-inches min. '�' 9. Drive or place the fence posts into the ground 18-inches min. A � 12—inch min. depth is allowed if topsoil or other soft subgrade soil is not present and 18-inches cannot be reached. Increase fence post nun. depths by 6 inches if the fence is located on slopes of 3H:1 V or steeper and the slope is perpendicular to the fence. If required � post depths cannot be obtained,the posts shall be adequately secured by bracing or guying to prevent overturning of the fence due to sediment loading. � 10. Use wood, steel or equivalent posts. The spacing of the support posts shall be a maximum of 6-feet. Posts shall consist of either: � � Wood with dimensions of 2-inches by 2-inches wide min. and a 3-feet min. length. Wood posts shall be free of defects such as knots, splits, or gouges. � • No. 6 steel rebar or larger. � • ASTM A 120 steel pipe with a minimum diameter of 1-inch. � U,T, L, or C shape steel posts with a muiimum weight of 1.35 lbs./ft. � • Other steel posts having equivalent strength and bending resistance to the post sizes listed above. � 11. Locate silt fences on contour as much as possible, except at the "" ends of the fence where the fence shall be turned u hill such that , P the silt fence captures the runoff water and prevents water from � flowing around the end of the fence. 12. If the fence must cross contours,with the exception of the ends of � the fence,place gravel check dams perpendicular to the back of the fence to minimize concentrated flow and erosion. The slope of the fence line where contours must be crossed shall not be steeper than 3H:1 V. � • Gravel check dams shall be a roximately 1-foot deep at the PP back of the fence. Gravel check dams shall be continued � perpendicular to the fence at the same elevation until the top of the check dam intercepts the ground surface behind the fence. • Gravel check dams shall consist of crushed surfacing base � course, ravel bacicfill for walls, or shoulder ballast. Gravel g check dams shall be located every 10 feet along the fence � where the fence must cross contours. • Refer to Figure 4.2.13 for slicing method details. Silt fence installation �- using the slicing method specifications: i� Yolume II—Construction Stormwater Pollution Prevention-August 201 Z I! �. 4-91 ' � � � i�r . 1. The base of both end posts must be at least 2- to 4-inches above the top of the filter fabric on the middle posts for ditch checks to dzain � properly. Use a hand level or string level, if necessary, to mark base points before installation. 2. Install posts 3- to 4-feet apart in critical reten�ion areas and 6-to 7- � feet apart in standard applications. 3. Install posts 24-inches deep on the downstream side of the silt � fence, and as close as possible to the filter fabric, enabling posts to support the filter fabr�c fram upstxeam water pressure. 4. Install posts with the nippxes facing away fram the filter fabric. �r, 5. Attach the filter fabric to each post with three ties, all spaced within the top S-inches of the filter fabric. Attach each tie � diagonally 45 degrees through the filter fabric,with each puncture at least 1-inch vertically apart. Each tie should be positioned to hang on a post nipple when tightening to prevent sagging, � 6. Wz'ap approximately 6-inches of fabric a.round the end posts and secure with 3 ties. � 7. No more than 24-inches of a 36-inch filter fabric is allowed above ground level. Compact the soil immediately next to the filter fabric with the front � wheel of the tractor, skid steer, or roller exerting at least 60 pounds per square inch. Compact the upstream side first and then each side twice for a total of four trips. Check and correct the silt fence � installation for any deviation before compaction. Use a flat-bladed shovel to tuck fabric deeper inta the ground if necessary. , � � � , '' � . '' � ; � Yolume I.I—Construction S'tormwater Pollution Prevention-August 2012 4-92 � I � ` � �. a+ �en+ting h�ight pOST SPpCiNG: m�x.24' 7'max.on op�n nrns , ..._....'•--° -- `--•••----°--•TppdFabric � �, , 4 m�x.en pooling u�as , Atheh tabAa M {. • �211 �^^ upstrann sid�ot post r �8• . � FLOW--� 6AVa aya�ueh ald�et � POST DEPTHt sut r�nc�z m 1 tlnu Its�nueh b•!ow yraued M1M d�Ne�aonlnp `' as h6Ma apsw 9tound eo p.s.l.er pn�t�r � o. -�: OMgonel eCachrt�C/1t �OO�XeeenpaetE� 700%tomp�etlun �ygsyyd��, �\\\i�� /\`,/\\%\\�/\\ �j�j�� f i��ii��i�ii ' - � i��i��i��i� ��>�� r��`��`�,� ��*.� �n�,�o��s: �j�\�\/�� j`��\��//\ �;�,//�/�� \�/�i�/��`\\ •Gan�er rab�SC et pors.r needed. �r ��\��/�\�� \�\��\��\� Pet I�st. � �1 •�fiie tFree des a1 w1tMn B'of teb�9e. /��/\�/�� M \��\\��/�\\ •poYtfonsaehUediegonely.puncksinghalmve�ticaRy �/�// �/��// � /��/��//��//� a minfmum of 1'epaA. �\\�� \ » \\�\�\��\ � •kang eacA tla on a post rippie and BgTRsn se�vaiyt. ;- No more lhan 24"of a 38'fab�c use cer,�e uec tsabd a soe w.e. is ellowed above ground. � RoY of sllt fence i�...� OP�retlon Post insteEled . atler � compaccon Fab�ic �°� SHt Fence goutid ., � �`�� _�,.�.��,��` �\�_.� ��i�7 ��,�, ,b C �t. } � �'� ��`��` :��h�� 'r.iY l�i•!� !,�i 1 �Y,v=:%!i! i�i-�\ � ��\�\ti•� Y��, p�v.\�v �/,�i�. /�k"�'di,h.ki� �`' 2�-�mm !�:a�-'r'� u i`\. ��"e;'ll•-�,i':��; � ,�; � .��•�J v,a�. -i�� '�' '$'�. /i. � �'!•�r ii ii �Oi�vi�ij�,Q��j��'tj � .. Q��.� ��: ��. � 1\�`:,\ q\�l,`;%;:�\j\�!�;�;/\`/,i; •"�!\'i\�i`\:\y'.\;••\.�' `•,'\�// � �� .,�. q�/� • Haiu�ntaf chfsei pdm Sicng blade (76 mm wltiM�J (18 mm wldtlt) �mpleted 4ar�latlon � Vihratary piow is nat acceptable t�ecause of h�tzornal enmpactlon � Figure 4.2.13—Silt Fence fnstallation by Slicing Method � Maintenttnce • Re air an da�na e immediatel . P Y g Y Standards Intercept and convey all evident concentrated flows up�iill of the silt � . � fence to a sediment pond. • Check the uphill side of the fence for signs of the fence clogging and � acting as a barrier to flow and then causing channelizatian of flows parailel to the fenee. If this accurs, replace the fence or remove the trapped sediment. � � �� Yolume II—Constf-uction Stormtivater Pollution Prevention-August 2012 �' �- 4-93 � I � � • Remove sediment deposits when the deposit reaches approximately one-third the height of the silt fence, or install a second silt fence. � • Replace filter fabric that has deteriorated due to ulh•aviolet breakdown. � � ' , r � � � � � � � � � � � Volume II—Construction Stormwater Pollution Prevention-August 2012 I � 4-94 � I ! � .. � BMP C235: Wattles � Purpose Wattles are temporary erosion and sediment control barriers consisting of straw, compost, or other material that is wrapped in biodegradable tubular plastic or similar encasing material. They reduce the velocity and can � spread the flow of rill and sheet runoff, and can capture and retain sediment. Wattles are typically 8 to 10 inches in diameter and 25 to 30 feet in length. Wattles are placed in shallow trenches and staked along the ' � contour of disturbed or newly constructed slopes. See Figure 4.2.14 for typical construction details. WSDOT Standard Plan I-30.30-00 also provides information on Wattles � (http://www.wsdot.wa.gov/Desi�n/Standards/Plans.htm#SectionI) Conditions of Use • Use wattles: • In disturbed areas that require immediate erosion protection. �' On exposed soils during the period of short construction delays, or • over winter months. �. • On slopes requiring stabilization until permanent vegetation can be established. � • The material used dictates the effectiveness period of the wattle. Generally,Wattles are typically effective for one to two seasons. • Prevent rilling beneath wattles by properly entrenching and abutting �, wattles together to prevent water from passing between them. Design Cr�iteria • Install wattles perpendicular to the flow direction and parallel to the � slope contour. • Narrow trenches should be dug across the slope on contour to a depth of 3- to 5-inches on clay soils and soils with gradual slopes. On loose � soils, steep slopes, and areas with high rainfall,the trenches should be dug to a depth of 5-to 7- inches, or 1/2 to 2/3 of the thickness of the � wattle. • Start building trenches and installing wattles from the base of the slope ' �,, and work up. Spread excavated material evenly along the uphill slope � and compacted using hand tamping or other methods. • Construct trenches at intervals of 10-to 25-feet depending on the steepness of the slope, soil type, and rainfall. The steeper the slope the , �, closer together the trenches. • Install the wattles snugly into the trenches and abut tightly end to end. I � Do not overlap the ends. • Install stakes at each end of the wattle, and at 4-foot centers along ' � entire length of wattle. Yolume II—Construction Stormwater Pollution Preve��tion-August 2012 4-95 � I � � • If required, install pilot holes for the stakes using a straight bar to drive holes through the wattle and into the soil. � • Wooden stakes should be approximately 3/4 x 3/4 x 24 inches min. Willow cuttings or 3/8-inch rebar can also be used for stakes. • Stakes should be driven through the middle of the wattle, leaving 2 to � 3 inches of the stake protruding above the wattle. Maintenance • Wattles may require maintenance to ensure they are in contact with � Standards soil and thoroughiy entrenched, especially after significant rainfall on steep sandy soils. � � � � � ' � � � � . � � � � Yolume II—Construction Stormwater Pollution Prevention-�Iugust Z012 4-96 '' � � � � � , ' �------- 3-4 —----�' � 1 � (1.2m) �" � � ��' � � �` ' / > >��`� � � ' ' �. ,I \� ;� .. Straw Ral}s Must "�' i. �� . � v � i:� �. -. Be Placed Along r �;,�. , Slope Contours �'�s'\�� ,�, Adjacent rolls shall •��'` �` - [ightly abut---1 �, \' � �, . ; - / /I �-J� ', .. i l\ r � . I/ I 1 y ,� ~ � �'� �ly .. {/ I ��%X� .�i'r:�� ; \\ � � � �:�\^ \��./X`/� '\�i1,�1f �\:�/ ' � }�_�I \/l,�. . / � '�i-> .�+s'�`' � ��_.._ `�` 5 ;,? . , � � ) 10'-ZS'(3-Sm) r y ) ;,i! /'��\i\ �'�' \�;\�;5 'i �>. '- � \\ - - , /�':.� . \/��\�/ \j\�` \//��.., Spacing Depends � � SfoSelStee ness /��/��i; Sediment,organic matter, � p p �'�\�/i�� capt ued beh nd heao3ls. �� i\�� //\ i \�\�� //�. � � , � i�—•\. �.>�., � � ? ; � 3.'_5"(75-125mm} � \ I �: :.�� II }' \� �`'��;= ' 8"-10"DIA. /;�i \ 1 __ /=' \ � :\�. I; .��{200-250mm) �� '�` � \�� /` ' - �� '� i _-. . - � � � �` j � `;�;._ � -' --� -�. --- --- � Live Stake �I � ,� : --- ;;,-. z i /•. j.. I � ` --- ��'�\. ��;��..., �` � r �f� � - 1" X 1" Stake i (/i� not to scale (25 x 25mm) r, �.. � � NOTE: � l.Sh•aw roll installation requires the pIacement and secure staking of the roll in a trench,3"-5"(75-125Fnm} deep,dug on contour. runoff must not be allowed to nm under or around roll. � Figure 4.2.14—Wattles � � I � � — evention-Au st 2012 Volume II Construction Sto�mwater Pollution Pr Su 4-97 I � I � Stormwater Pollution Prevention Plan � Appendix C — General Permit �. � � � � I � � � � ! 1 � � � , � � � 23 12433.007.doc I � � I � Stormwater Pollution Prevention Plan � A endix D — Site Ins ection Forms and Site Lo ) AP p � g � The results of each inspection shall be summarized in an inspection report or checklist that is entered into or attached to the site log book. It is suggested that the inspection '" report or checklist be included in this appendix to keep monitoring and inspection information in one document, but this is optional. However, it is mandatory that this SWPPP and the site inspection forms be kept onsite at all times during construction, and that inspections be performed and documented as outlined below. r� At a minimum, each inspection report or checklist shall include: �' a. Ins ection date/times P � b. Weather information: general conditions during inspection, approximate amount of precipitation since the last inspection, and approximate amount of precipitation within the last 24 hours. �, c. A summary or list of all BMPs that have been implemented, including observations of all erosion/sediment control structures or � practices. d. The following shall be noted: � i. locations of BMPs inspected, ii, locations of BMPs that need maintenance, � iii. the reason maintenance is needed, iv. locations of BMPs that failed to operate as designed or � intended, and v. locations where additional or different BMPs are needed, and � the reason(s)why e, A description of stormwater discharged from the sitee The presence �' � of suspended sediment, turbid water, discoloration, and/or oil sheen shall be noted, as applicable. �, f, A description of any water quality monitoring performed during � inspection, and the results of that monitoring. g. General comments and notes, including a brief description of any II � BMP repairs, maintenance or installations made as a result of the �� inspection. � h. A statement that, in the judgment of the person conducting the site inspection, the site is either in compliance or out of compliance with the terms and conditions of the SWPPP and the NPDES �"' permit. If the site inspection indicates that the site is out of �, compliance, the inspection report shall include a summary of the I� � 24 12433.007.doc � I � Stormwater Pollution Prevention Plan � remedial actions required to bring the site back into compliance, as well as a schedule of implementation. i. Name, title, and signature of person conducting the site inspection; � and the following statement: "I certify under penalty of law that this report is true, accurate, and complete, to the best of my � knowledge and belief'. When the site inspection mdicates that the site is not in compliance with any terms and conditions of the NPDES permit, the Permittee shall take immediate action(s) to: stop, � contain, and clean up the unauthorized discharges, or otherwise stop the noncompliance; correct the problem(s); implement appropriate Best Management Practices (BMPs), and/or conduct maintenance of existing BMPs; and achieve compliance with all � applicable standards and permit conditions, In addition, if the noncompliance causes a threat to human health or the environment, the Permittee shall comply with the Noncompliance Notification requirements in Special Condition SS.F of the permit, � � � � � � � � � � � � ' �' Site Inspection Form � I �u 25 12433.007.doc � � � Stormwater Pollution Prevention Plan � General Information Project Name: Inspector Name: Title: CESCL # : � Date: Time: Inspection Type: ❑ After a rain event ' "� ❑ Weekly ❑ Turbidity/transparency benchmark exceedance ❑ Other Weather �° Precipitation Since last inspection In last 24 hours Description of General Site Conditions: � � Inspection of BMPs � Element 1: Mark Clearing Limits BMP: � Inspected Functioning Location y N Y N NIP Problem/Corrective Action � �" � BMP: Location Inspected Functioning problem/Corrective Action �. Y N Y N NIP � � 'w Element 2: Establish Construction Access B1VIP: I� '' Inspected Functioning �� Location Y N Y N NIP Problem/Corrective Action � � ' �,. BMP: � Location Inspected Functioning problem/Corrective Action Y N Y N NIP , � �� Element 3: Control Flow Rates � BMP: 26 12433.007.doc ' � I � Stormwater Pollution Prevention Plan � Inspected Functioning Location Y N Y N NIP Problem/Corrective Action � �,; � BMP; Inspected Functioning Location y N Y N NIP Problem/Corrective Action � �, Element 4: Install Sediment Controls BMP: t Location Inspected Functioning problem/Corrective Action Y N Y N NIP � � BMPe Location Inspected Functioning problem/Corrective Action Y N Y N NIP � � BMP: �' Location Inspected Functioning problem/Corrective Action Y N Y N NIP , � I � BMP. � Inspected Functioning Location Y N Y N NIP Problem/Corrective Action �, �w 1 BMP; � Location Inspected Functioning problem/Corrective Action � Y N Y N NIP � � '. ' £ � � 27 12433.007.doc ' � � � Stormwater Pollution Prevention Plan � Element 5: Stabilize Soils � BMP; Inspected Functioning Location y N Y N NIP Problem/Corrective Action � �: � BMP: Location Inspected Functioning problem/Corrective Action ' Y N Y N NIP � BMP: Inspected Functioning Location y N Y N NIP Problem/Corrective Action � � BMP; � Inspected Functioning Location �, N �, N �P Problem/Corrective Action � �, Element 6: Protect Slopes BMP; � Inspected Functioning Location y N Y N NIP Problem/Corrective Action �° � I � � BMP: Location Inspected Functioning problem/Corrective Action ,� Y N Y N NIP � �; �r" ;� BMP: Location Inspected Functioning problem/Corrective Action I� " Y N Y N NIP ir � 28 12433.007.doc � � Stormwater Pollution Prevention Plan �,,,' � Element 7: Protect Drain Inlets � BMP: Inspected Functioning ' Location Y N Y N NIP Problem/Corrective Action � � BMP: � Location Insp�ct�d Y nNio N� Problem/Corrective Action � � BMP: ��' Location Inspected Functioning problem/Corrective Action Y N Y N NIP � r Element 8: Stabilize Channels and Outlets � BMP; Inspected Functioning �' �; Location y N Y N NIP Problem/Corrective Action �� :. � � BMP; Location Inspected Functioning problem/Corrective Action � Y N Y N NIP � � � BMP: " Location Inspected Functioning problem/Corrective Action � Y N Y N NIP � � BMP: I F Inspected Functioning � Location Y N Y N NIP Problem/Corrective Action �' r '' � 29 12433.007.doc ''' � i � Stormwater Pollution Prevent►on Plan i � � � ' Element 9: Control Pollutants ' BMP: Inspected Functioning Location Y N Y N NIP Problem/Corrective Action � � , BMP: Location Inspected Functioning problem/Corrective Action Y N Y N NIP ' ' Element 10: Control Dewatering BMP: ' Inspected Functioning Location y N Y N NIP problem/Corrective Action , � BMP: ' Location Insp�ct�d Y nNio NIP problem/Corrective Action ir� BMP: � Location Inspected Functioning problem/Corrective Action Y N Y N NIP ' � , , � � 30 12433.007.doc � Stormwater Pollution Prevention Plan � Water Qualit Monitorin Was any water quality monitoring conducted? ❑ Yes o No � If water quality monitoring was conducted, record results here: � � If water quality monitoring indicated turbidity 250 NTU or greater; or transparency 6 � cm or less, was Ecology notified by phone within 24 hrs? ❑ Yes ❑ No � If Ecology was notified, indicate the date, time, contact name and phone number below: Date: Time: � Contact Name: Phone#: � General Comments and Notes Include BMP re airs, maintenance, or installations made as a result of the ins ection. Were Photos Taken? ❑ Yes ❑ No � If hotos taken, describe hotos below: �a � � � ' ' ' , � 32 12433.007.doc � i � � 6.0 SPECIAL REPORTS AND STUDIES The following reports are included in this sectione r. • FEMA Floodplain Habitat Assessment prepared by Wetlands & Wildlife, Inc., dated June 10, � 2013 , ' , � � , � � � , ' , � ' , I � 12433.006.doc � � � A� � � � ; � '�' � �V'ETLAI'�TDS � WILI�LI�E � Environmental�onsultin� � C FEMA FLOOIDPLAIN HABITAT ASSESSMENT WEBER PRt)PERTY (CITY OF YELM, WA� � THURSTON CoUNTY PARCEL #227192403000 _ _ .�..�.�._.�. � � Prepared For: Mr, Randy Weber � 26550 SE 354th Place �' Black Diamond, WA 98010 � � r j� Prepared By: Wetlands& Wildlife, Inc. �" 15129-55th Drive SE � Everett, Washington 98208 �. (425) 337-6450 � �". June 10, 2013 ir. II � I � � TABLE OF CONTENTS � BACKGROUNDINFORMATION � .�- INTRODUCTION AND BRIEF SITE DESCRIPTION 2 METHODOLOGIES OF THIS FLOODPLAIN HABITAT ASSESSMENT 2 SITE VISIT FINDINGS 4 ir PROPOSED PROJECT DESCRIPTION 4 �" PROPOSED COMPENSATORY MITIGATION EFFORTS 5 � ACTION AREA DESCRIPTION 6 PROTECTED AREA DESCRIPTION 8 �` HABITAT AREA NARRATIVE 8 I ENDANGERED AND THREATENED SPECIES LISTS 9 IY USE OF THE ACTION AREA BY ENDANGERED OR THREATENED SPECIES 9 � ESSENTIAL FISH HABITAT DISCUSSION 1 O � ANALYSIS OF EFFECTS ON ESA-LISTED SPECIES 1 O � DETERMINATION OF EFFECTS ON ESA-LISTED SPECIES 11 SUMMARY OF REVIEW FINDINGS 12 � LIMITATIONS AND USE OF THIS REPORT 13 I� �° REFERENCES AND LITERATURE REVIEWED 14 b � FIGURES ATTACHED TO THIS REPORT: � 'I. HABITAT ASSESSMENT FLOW CHART FIGURE'� 2. PROJECT VICINITY&ACTION AREA MAP FIGURE 2 3. PROJECT AREA MAP FIGURE 3 I � 4. HABITAT AREA MAP FIGURE 4 �,,, 5. PROPOSED PROJECT MAP FIGURE 5 � , ' � � BACKGROUND INFORMATION � On September 22, 2008, the National Marine Fisheries Service (NMFS) issued a Biological Opinion that recommended changes to the implementation of the National Flood Insurance Program (NFIP) to meet the requirements of the Endangered Species Act (ESA) in the Puget Sound watershed. The Biological Opinion �" noted that the continued implementation of the NFIP in the same manner adversely affects the habitat of �w certain threatened and endangered species within the Puget Sound watershed. The Biological Opinion issued by NMFS offered local communities within the Puget Sound watershed the following two ways to � meet the ESA requirement: 1. Prohibit all development in the floodway and other areas; OR 2. Enact regulations that allow development that meet the criteria specified in the Biological Opinion � by either: a. Adopting the Floodplain Management and the Endangered Species Act Model Ordinance produced by the Federal Emergency Management Agency (FEMA) in January 2012 � (hereinafter referred to as the Model Ordinance), or b. Enforcing the same requirements in other ordinances, such as the growth management, zoning, or critical areas regulations. � FEMA roduced a document titled Floodplain Habitat Assessment and Mitiqation Reqional Guidance p (produced in April of 2011 and hereinafter referred to as the Regional Guidance document) to provide � guidance for evaluating development projects located within FEMA Flood Hazard Areas. As such, permit applications for proposed development within mapped FEMA Flood Hazard Areas are required to be in compliance with the ESA through implementation of the FEMA Floodplain Habitat Assessment � requirements. As mentioned in Section 1.3.1 of the Model Ordinance, the purpose of the Model Ordinance as it specifically relates to fish and wildlife habitat areas is to "Maintain the quality of water in rivers, streams, lakes, � ri s and marine areas and their flood lains so as to rotect ublic water su lies areas of the Public estua e , p p p pp , � Trust, and wiidlife habitat protected by the Endangered Species Act". Another purpose of the Model � Ordinance, located in Section 1.3.J, is to "Retain the natural channel, shoreline, and floodplain creation processes and other natural floodplain functions that protect, create, and maintain habitat for threatened � and endangered species." Therefore, it is the intent of the Model Ordinance to ensure that all development proposals located within the regulatory Flood Hazard Areas adequately assess potential impacts to fish and wildlife species and their habitats protected by the ESA. The Model Ordinance and the Regional Guidance document were developed to address potential impacts to all ESA-listed species, which are described in � further detail later in this report. As stated on Page 2 of the Regional Guidance document, "There are only two circumstances where a habitat assessment would not be required: 1. Projects that are listed as exempt from conducting a habitat assessment in the community's �, floodplain management ordinance; and 2. Projects that have undergone Section 7 consultation under the ESA in order to obtain a federal permit." � Pursuant to the Habitat Assessment Flow Chart included on page 7 of the Regional Guidance document � (attached as Figure 1 of this report), this detailed Floodplain Habitat Assessment is required because the � Wetlands& Wildlife, Inc. June 10, 2013 �, Weber Property--FEMA Floodplain Habitat Assessment Report '� � City of Yelm,Washington (Tax Parcel#227192403000) Page 1 � � � � proposed project is located in a regulated FEMA floodpiain, a Biological Evaluation has not been prepared for the project, NMFS and/or USFWS have not determined concurrence with Section 7 of the ESA, and the proposed development project is not considered an allowed activity per the definitions of the Regional � Guidance document. Therefore, Wetlands & Wildlife, Inc. was retained by the applicant to conduct a Floodplain Habitat Assessment per the FEMA guidelines. The format antl contents of this report conform to � the standards set forth in the FEMA Regional Guidance document. � INTRODUCTION AND BRIEF SITE DESCRIPTION This report is related to real property which is located northwest of the intersection of Rhoton Road SE and � Northern Pacific Road NW in the City of Yelm, Washington (located in a portion of Section 19, Township 17N, Range 02E, W.M.). The Thurston County tax parcel number for the property follows: 22719240300. Per information obtained from the Thurston County Assessor's Office, the site encompasses approximately � 7.51 acres and is zoned for Industrial use. The property is currently owned by Randy and Linda Webero Vehicular site access is gained from the east via Rhoton Road SE, as shown on the attached Project Vicinity & Action Area Map (Figure 2). The property is located within the Nisqually River Watershed and the Water � Resource Inventory Area (WRIA) 11. Portions of the subject site are mapped as being located within the regulated FEMA flood hazard areas (100- � year floodplain)associated with Yelm Creek,which is located along the western border of the subject property and is considered a Type N stream (Type 5 stream per City of Yelm). The project is not exempt from the requirements of the model ordinance and has not undergone Section 7 ESA consultation as discussed above. � Therefore, the City of Yelm has informed the applicant of their requirement to prepare a detailed Floodplain Habitat Assessment on the subject property per the requirements of the FEMA Model Ordinance and I' �. Regional Guidance documents. Wetlands & Wildlife, Inc. was retained by the applicant to conduct a � Floodplain Habitat Assessment per the FEMA guidelines and to produce this report. The format and contents of this report conform to the FEMA Regional Guidance document. � Natural Resource Conservation Service Soils Description: The Natural Resources Conservation Service (NRCS) mapped the subject property as being underlain by � Spanaway gravelly sandy loam, 0 to 3 percent slopes. � Spanaway gravelly sandy loam, 0 to 3% slopes is described by the NRCS as a moderately deep, ' r� somewhat excessively drained soil on terraces and outwash plains. This soil formed in volcanic ash over � gravelly outwash. The surface layer is gravelly sandy loam from 0 to 15 inches below the surface. From 15 to 20 inches below the surface, soils are very gravelly sand. The subsoil in extremely gravelly sand from 20 �^ to 60 inches below the surface. Available water capacity of this soil is low, Spanaway and similar soils �,, comprise this entire unit. � �� METHODOLOGIES OF THIS FLOODPLAIN HABITAT ASSESSMENT !" Wetlands & Wildlife, Inc. conducted site visits to the subject property on February 18, 2013 and May 9, � !� Wet/ands& Wildlife, lnc. June 10, 2013 � Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 2 � � � � 2013 for the purpose of evaluating the proposed project related to current federal, state, and local environmental regulations. The site visit included a detailed review of the subject property. In addition to assessing the subject site, Wetlands & Wildlife, Inc. also visually assessed the surrounding properties for I �. other types of Critical Areas as defined by the Yelm Municipal Code, such as wetlands, streams, and Fish ..- and Wildlife Habitat Conservation Areas. Wetlands & Wildlife, Inc. evaluated the subject site and the surrounding vicinity, using the methodologies described in the FEMA Regional Guidance document and the FEMA Model Ordinance. The Advanced Traininq Manual for Bioloqical Assessment Preparation produced by the Washington State Department of +� Transportation was also examined for use of this project. Although this is not a transportation project, many components of the Biological Assessment Advanced Training Manual are applicable to Floodplain Habitat � Assessments for construction-related projects. Wetlands & Wildlife, Inc. used methodologies described in Determininq the OrdinaN Hiqh Water Mark on �` Streams in Washinqton State (Washington Department of Ecology Publication #08-006-001, April 2008) to make a determination regarding the Ordinary High Water Mark (OHWM) of Yelm Creek, located along the westem boundary of the subject site. � The methodologies described in the Washinqton State Wetlands Identification and Delineation Manual (Washington State Department of Ecology Publication #96-94, March 1997), the U.S. Armv Corps of � Enqineers Wetland Delineation Manual (produced in 1987), and the U.S. Armv Corps of Enqineers Reqional Supplement to the Corps of Enqineers Wetland Delineation Manual: Western Mountains Vallevs, and Coast Reqion (produced in May 2010 and hereinafter referred to as "the Corps Regional Supplement") � were appliedo The Corps Regional Supplement is designed for concurrent use with the 1987 Corps Wetland Delineation Manual and all subsequent versions. The 2010 Regional Supplement provides technical guidance and procedures for identifying and delineating wetlands that may be subject to regulatory � jurisdiction untler Section 404 of the Clean Water Act. Where differences in the two documents occur, this Regional Supplement takes precedence over the Corps Manual for applications in the Western Mountains, � Valleys, and Coast Region. The methodologies in these documents were used to make a determination regarding the potential of regulated wetlands on the project site and areas within 300 feet of the proposed project's limits of disturbance, as required by the City of Yelm. This review is necessary to determine if any ' .� regulated critical areas exist outside of the project site which would cause associated buffer widths to � extend into the project area, � In addition to on-site field reviews, Weflands& Wildlife, Inc. examined aerial photographs and topographical � data (elevation contours) on Thurston County's GeoData maps. Soil survey maps produced by the Natural Resources Conservation Service (NRCS), National Wetlands Inventory maps produced by the U.S. Fish � and Wildlife Service (USFWS), SalmonScape fish distribution maps produced by the Washington � Department of Fish and Wildlife (WDFW), StreamNet fish distribution maps produced by Pacific States Marine Fisheries Commission, the Washington State Department of Natural Resources Forest Practices I * Application Review System Water Type Maps, and Priority Habitats and Species (PHS) maps produced by �, WDFW. � ' �"' Wetlands& Wildlife, Inc. June 10, 2013 � Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 3 ' �^ � � � � SITE VISIT FINDINGS This property is currentiy undeveloped and is currently dominated by Scots broom (Cytisus scoparius, � nol/Upl), a non-native, invasive shrub. Smaller portions of the site also contain native vegetation such as serviceberry (Amelanchier alnifolia, FacU), Oregon grape (Berberis nervosa, FacU), and colonial bentgrass � (Agrostis tenuis, Fac). The site is generally level and contains Yelm Creek, a Type 5 stream which does not provide fish habitat within the Action Area (as defined below). A Category III riparian wetland on the western boundary. Yelm Creek is The western portion of the property (adjacent to Yelm Creek) and the � eastern portion of the site are mapped as FEMA flood hazard areas (Floodway and Floodway Fringe), as shown on project maps. No Wildlife Habitat Conservation Areas for terrestrial wildlife species were located during the site visits, and no mapped wildlife networks or terrestrial Wildlife Habitat Conservation Areas are � mapped as being located on the property or within 300 feet of the property. � PROPOSED PROJECT DESCRIPTION � Per the FEMA Regional Guidance document, all proposed projects within Flood Hazard Areas are required � to document how mitigation sequencing was followed. These mitigation sequencing standards are listed in order of preference and effectiveness as follows: avoidance, minimization, restoration, and compensation. Please see Map Sheet CA1.00 which depicts the project proposal on the project site. Due to the location � and extent of the flood hazard areas on the subject property, it would be difficult to derive a reasonable use of the property which is zoned for industrial use while avoiding all impacts to the floodplain. Therefore, the applicant is proposing to raise the elevation level of the eastern portion of the property through placement � of fill materials to an approximate elevation level of 335 feet above sea level. The eastern portion of the property is located outside of all wetlands, stream, and fish and wildlife habitat conservation areas. � However, the eastern portion of the site is currently mapped as being located within a FEMA flood hazard area. The applicant is proposing to fill 132,264 square feet of area located among the eastern portion of the on-site flood hazard. Based on information from the pro�ect engineer, the pro�ect proposal will result in a total volume of approximately 3,650 cubic yards of fill material being placetl in this portion of the flood �, hazard area, and will modify the flood hazard area to eliminate this area from the floodplain of Yelm Creek. During this construction process, the applicant is proposing to scrape the topsoil from this proposed fill area ' � and stockpile the topsoil for future placement among the proposed restoration planting areas. �. In order to provide equivalent potential flood storage capacity on the site, the applicant is proposing to remove (cut) 3,650 cubic yards of existing soil (equivalent volume to that which is proposed for fill) from � 83,350 square feet of area which is located among the western portion of the property. This project will result in a balanced cut and fill volume, and the proposed cut will maintain the level of flood storage �' capacity that currently exists on the site, while also creating a more connected floodplain for Yelm Creek. � After this project is completed, the Riparian Habitat Area associated with Yelm Creek will extend further east on the property than it currently does, and will extend out to the eastern edge of the newly created �' flood hazard areas (per YMC section 14.08.140.D.2.c.ii). � The proposed project will avoid impacts to Yelm Creek and the associated riparian wetlande However, the �" proposal will result in unavoidable temporary grading impacts to much of the western portion of the �.: ' �' Wetlands& Wildlife, Inc. June 10, 2013 {�, Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 4 ' � , ; � � �. property, including portions of the on-site buffer for Yelm Creek and associated wetland. The proposed grading areas have been heavily disturbed in the past (dump truck piles of fill material can be seen in several locations), contain large quantities of Scots broom (Cytisus scoparius, nol/Upl), and currently �= provide a relatively low level of ecological functions and values. The vast majority of the proposed grading areas are currently dominated by Scots broom, currently classified as a Class B noxious weed in � Washington State. Ail Scots broom within the project work areas will be removed and transported to an approved off-site location as part of this project. To ensure that no loss of ecological functions and values occurs on the site or within close proximity of Yelm Creek, the applicant is proposing to retain large patches � of existing native, intact trees and shrubs which are located among the northwestern portion of the site (see Map Sheet CA1.00 for locations). After the grading efforts have been completed, the applicant is also proposing to restore the entire 83,350 square feet of temporarily impacted Riparian Habitat Area by � planting native trees and shrubs as described below. � PROPOSED COMPENSATORY MITIGATION EFFORTS To ensure that no loss of functions and values occurs to the flood hazard areas or on-site critical areas, the � applicant is proposing to restore the entire 83,350 square feet(1.91 acres) of temporarily impacted/graded areas by planting native trees and shrubs. During grading, topsoil in the proposed cut area should be reserved and stockpiled on-site. The topsoil should be replaced on the surface of the graded areas at a � minimum depth of six inches to ensure a suitable planting medium. Please see Map Sheet CA1.00 for a depiction of the proposed restoration area on the subject site. Per industry standards and guidelines, this mitigation proposal includes calculating required plant quantities by planting 60% of the mitigation area with � native trees and planting 40% of the mitigation area with native shrubs. The native trees are proposed to be planted on 12-foot centers (spaced a minimum of 12 feet apart), while the native shrubs are proposed to be planted on 6-foot centers (spaced a minimum of 6 feet apart) among the mitigation areas. Using this � approach, the applicant is proposing to plant a total of 348 trees and 924 shrubs among the buffer restoration, as outlined in the table below. � Please see the table below which describes the proposed restoration plantings among the cut area: Proposed Buffer Restoration Plantings(quantities based on 83,350 SF) � Common Name Latin Name S¢e Spacinq Quantity 1. Douglas fir Pseudotsuga menziesii 1�allon 12 ft. min 87 2. Big-leaf maple Acermacrophyllum 1- ailon 12 ft. min 87 �. 3.Oregon white oak Quercus garryana 1�allon 12 ft. min 87 4.Black cottonwood Populus balsamifera 1�allon 12 ft. min 87 � 5.Snowberry Symphoricarpos albus 1�allon 6 ft. min 154 � 6.Serviceberry Amelanchier alnifolia 1 gallon 6 ft. min 154 I �° 7. Hazelnut Corylus cornuta 1 gallon 6 ft. min 154 �a 8.Nootka rose Rosa nutkana 1 gallon 6 ft. min 154 9.Osoberry Oemleria cerasiformis 1 allon 6 ft. min 154 � 10.Oregon grape Berberis nervosa 1 allon 6 ft. min 154 ' �" Wetlands& Wildlife, Inc. June 10, 2013 �, Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 5 � i � � � � � Prior to any earthwork within or near Critical Area buffers, temporary erosion and sediment control measures (silt fence or similar best management practices) will be installed around the proposed disturbance limits to � minimize potential erosion from reaching the adjacent wetland and stream. Please see Map Sheet CA1.00 for a depiction of the proposed conceptual mitigation plan associated with the � required Critical Areas Variance on the project site. The applicant is proposing to seed all bare ground areas which are temporarily disturbed as part of this project immediately upon completion of the grading. To aid in soils stabilization, all bare ground areas within the +� impacted buffer area shall be seeded to the grass seed mixtures below, or a similar grass seed mixture: � Common Name Latin Name Ibs./1,000 s.f. Colonial bentgrass Agrostis tenuis 0.6 Red fescue Festuca rubra 0.3 � White clover Trifolium repens 0.2 The silt fence and all erosion and sediment control measures will remain in place until the soil is sufficiently stabilized to prevent erosion of soil in close proximity to Yelm Creek and the associated Category III `° wetland. � ACTION AREA DESCRIPTION � The proposed work area is located in the Flood Hazard Area of Yelm Creek, located along the western border of the subject site. The proposed work inciudes filling a portion of the flood hazard area in the eastern part of the site and creating additiona� flood storage capacity in the western part of the site, nearer � to Yelm Creek. Following grading, the entire area of cut will be restored using native trees and shrubs. � As shown in the Estimated Noise Attenuation tables below, the Action Area for the specific project components includes all terrestrial and freshwater environments within 100 feet of the proposed Work Area, as that is the distance at which the pro�ect-related construction noise would attenuate to the ambient (existing baseline) noise level. Please see the Project Vicinity and Action Area Map (Figure 2) for a � depiction of the Action Area related to this project. This Action Area is required to determine how project- related activities may affect federally listed species which utilize the terrestrial and freshwater habitats ! �,.. within the vicinity of the project. � Wetlands & Wildlife, Inc. defined the Action Area by estimating the distance at which project-related � construction noise would attenuate to the baseline noise level. This was accomplished by using the following determining factors associated with this specific project: 1) estimated noise levels associated with projected construction equipment; 2) estimated background (ambient) sound level; 3) soft site vs. hard site conditions; 4) noise point source vs. line source; and 5) develop noise attenuation table for computing � distance of Action Area. Please see the project-specific tables below which were used to derive the Action Area distance. � Wetlands& Wildlife, Inc. June 10, 2013 �, Weber Property--FEMA Floodplain Habitat Assessment Report I � City of Yelm,Washington (Tax Parcel#227192403000) Page 6 � i � ��"` ESTIMATED PROJECT-RELATED NOISE LEVELS Construction Equipment Lmax at 50 feet from noise source Roller 80 dBA +� Dozer 82 dBA Excavator 81 dBA �a Dump truck 76 dBA Service truck(pickup truck 75 dBA �, Estimated Project Lmax 85 dBA �' Notes: 1. Lmax= highest projected sound level occurring during a noise event 2. Lmax data obtained from WSDOT Biological Assessment Preparation Assessment Advanced � Training �llanual (Tables 7-1 and 7-4). 3. Combined Lmax derived from the rules for combining noise levels described in WSDOT Biological Assessment Preparation Assessment Advanced Training Manual (Table 7-5), using the � 3 loudest pieces of equipment for tletermining the Lmax. � ESTIMATED BACKGROUND AMBIENT)NOISE LEVEL Estimated Background Noise level at Work Area (due to the 50 dBA suburban nature of the subject site � Estimated Background Noise level at Work Area (due to 80 dBA re ular shippin truck traffic and school bus traffic nearb Estimated back round noise 80 dBA � Notes: 1. Environmental background noise levels obtained from WSDOT Biological Assessment Preparation Assessment Advanced Training Manual (Tables 7-6). City-Data.com http://www.city-data.com estimates the population density in the vicinity of the project area to be between 2,834 people per � square mile which equates to an ambient noise level of 50 dBA as shown above. 2. Weflands & Wildlife, Inc. was unable to find information regarding Average Daily Traffic (ADT) on � Rhoton Road SE adjacent to the subject site. Per Table 7-1 of the training manual this would equate to 50 dBA. However due to the proximity to industrial uses including a shipping and receiving facility and a school bus yard, it is assumed that this area receives regular heavy vehicle � traffic. Per Table 7-1 of the training manual this would equate to 90 dBA (heavy trucks). Because the actual level of truck traffic is unknown, a conservative estimate of 80 dBA was assumed for the background noise level at the site due to industrial use and regular truck traffic. � ESTIMATED NOISE ATTENUATION RATES FOR PROJECT WORK AREA Distance from Project Area ft) Project-Related Noise Levels -7.5 dBA) Background Noise Level �" 50 85 dBA 80 dBA �'� **100** 78.5 dBA 80 dBA � Notes: 1.The noise created from the project's construction equipment is considered a point source noise.The standard reduction for point source noise is 6 dBA per doubling distance from the source. The noise receiving area located outside of the Project Area is considered a soft site and is absorptive � of noise energy. Absorptive ground results in an additional 1.5 dBA reduction per doubling of � Wetlands& Wildlife, Inc, June 10, 2013 Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 7 � � � , � I � distance as noise spreads from the source. Therefore, the reduction of 7.5 dBA per doubling distance was used to determine the approximate noise level at the Project Area. +� Per the above tables, the distance at which the project-related construction noise attenuates (declines) to a noise level equal to or less than the background noise of 80 dBA level is 100 feet. Please note that project- �" related noise is not the only factor used to determine the Action Area. Additional potential effects were �� considered to determine the Action Area (i.e. clearing of vegetation, grading, placement of fill, potential contaminants, etc.). Based on review of all project-related factors, the temporarily elevated noise levels is the � factor that would have the greatest potential to affect species which use the terrestrial and freshwater environments in the project vicinity. Therefore, Weflands & Wildlife, Inc. defined the Action Area as extending 100 feet from the Work Areas, as shown on the attached Project Vicinity&Action Area Map (Figure 2). �. PROTECTED AREA DESCRIPTION � The Protected Area is defined by the Regional Guidance document and the Model Ordinance as those lands that lie within the boundaries of the floodway, the riparian habitat zone (RHZ), and the channel migration area � (CMA).The Protected Area as defined by FEMA encompasses portions of both the western and eastern parts of the subject property. In this instance, the edge of the mapped floodway and the Protected Area are one and the same. The RHZ includes the water body and adjacent lands, measured perpendiculariy from the Ordinary � High Water Mark (OHWM) on both sides of the water body. Yelm Creek is considered a Type N stream with stable slopes, and therefore the RHZ associated with this water body includes areas within 150 feet of the OHWM. The mapped floodway and the watercourses used to determine the Protected Area for this project � are depicted in Figure 3 (Project Area Map). � HABITAT AREA NARRATIVE Please see the attached Habitat Area Map (Figure 4) for a depiction of habitat types described in this �, section. The subject property is undeveloped with typical vegetation represented by a canopy of serviceberry (Amelanchier alnifolia, FacU), Scots broom (Cytisus scoparius, nol/Upl), with colonial bentgrass (Agrostis tenuis, Fac) and common vetch (Vicia sativa, Upl) in the understory. A patch of non- � native black locust (Robinia pseudoacacia, Nol/Upl) is also present in the northwestern portion of the subject propertyo Yelm Creek and an associated Category III wetland are located along the western border �' � of the site. � The surrounding properties are represented by a mixture of industrial use and prairie/pasture that is being �° invaded by Scots broom. While the prairie habitat is important for a wide variety of wildlife species, the �, encroachment of invasive species alters the vegetative composition and function of these areas and I � diminishes their habitat value. � Yelm Creek on the western border of the site provides a movement corridor for wildlife as well as valuable spawning and rearing habitat for the ESA listed fish species in its downstream reaches (outside of the 100 �" foot action area). ' � ' �' Wetlands& Wildlife, Inc. June 10, 2013 �, Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 8 � i � ,�'' ENDANGERED AND THREATENED SPECIES LISTS The National Oceanic and Atmospheric Administration's National Marine Fisheries Service (NMFS) has I � jurisdiction over the species listings for marine animals and anadromous fish species. The following list includes all species identified as endangered or threatened within Thurston County, Washington which are � protected under NMFS'jurisdiction: 1 o Humpback whale(Megaptera novaeangliae); Endangered status 2. Southern resident Orca whale(Orcinus orca); Endangered status �' 3. Steller sea lion of western U.S. (Eumetopias jubatus); Endangered status 4. Puget SoundlGeorgia Basin Bocaccio(Sebastes paucispinis); Endangered status � 5. Puget Sound/Georgia Basin Canary rockfish (Sebastes pinniger); Threatened status 6. Puget Sound/Georgia Basin Yelloweye rockfish (Sebastes rubberimus); Threatened status 7. Puget Sound Chinook salmon (Onchorhynchus tshawytscha); Threatened status � 8. Puget Sound Steelhead trout(Onchorhynchus mykiss); Threatened status The United States Fish and Wildlife Service (USFWS) has jurisdiction over the species listings for freshwater � fish species and all other species. The following list includes all species identified as endangered or threatened within Thurston County, Washington which are protected under USFWS'jurisdiction: � 1. Coastal-Puget Sound DPS Bull Trout(Salvelinus confluenfus); Threatened status 2. Marbled murrelet(Brachyramphus marmoratus);Threatened status � 3. Nor�hern spotted owl (Strix occidentalis caurina); Threatened status USE OF THE ACTION AREA BY ENDANGERED OR THREATENED SPECIES � Humpback whales, Orca whales, Steller sea lions, Bocaccio, Canary rockfish, and Yelloweye rockfish are not ' � present within the proposed project's Action Area due to a lack of marine or estuarine habitat areas. Steelhead, Bull trout, Marbled murrelets, and spotted owls, are not present within the project's Action Area due to the lack of habitat requirements for these species. � Marbled murrelets and Northern spotted owls typically breed in old-growth or late successional coniferous forests. Both of these species typically uses areas where vast connected habitat exists, and they typically ' �' avoid urban/suburban areas due to their aversion to human activity(noise, developments, etc.). Based on the i� WDFW Priority Habitat and Species maps, no Marbled murrelet or spotted owl breeding sites (nests) are located among the project's Action Area. The nearest spotted owl nest site is located approximateiy 20 miles ' �' to the east of the subject site. Due to the lack of old-growth or late successional habitat among the project"s � Action Area, Wetlands & Wildlife, Inc. does not expect either of these bird species to occupy breeding/nesting I � habitat among the Action Area. `� Based on review of the WDFW's PHS database and Streamnet (fish data for the Northwest), no endangered and threatenetl species are known to utilize the project's Action Area. Critical habitat is defined in section � 3(5)(A) of the ESA as "(i) the specific areas within the geographical area occupied by the species...on which �' Wetlands& Wildlife, Inc. June 10, 2013 , �, Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 9 I � i � � are found those physical or biological features (I) essential to the conservation of the species and (II) which may require special management considerations or protection; and (ii)specific areas outside the geographical area occupied by the species...upon a determination by the Secretary [of Commerce (Secretary)j that such � areas are essential for the conservation of the species." � ESSENTIAL FISH HABITAT DISCUSSION � The Magnuson-Stevens Fishery Conservation and Management Act (MSA) includes a mandate that NMFS must identify essential fish habitat(EFH)for federally managed fish species. The Pacific Fishery Management Council has designated EFH for the Pacific salmon fishery, federally managed ground fishes, and coastal � pelagic fisheries (NMFS 2010). The majority of EFH is marine-based, though EFH is also designated for inland portions of the range for anadromous Pacific salmon species. The MSA defines EFH as "those waters and substrate necessary to fish for spawning, breeding, feeding, or growth to maturity." Furthermore, the � Pacific Fishery Management Council states that "EFH for the Pacific coast salmon fishery means those waters and substrates necessary for salmon production needed to support a long-term sustainable salmon fishery and salmon contributions to a healthy ecosystem". To achieve that level of protection, EFH must � inciude ail those streams, lakes, ponds, wetlands, and other currently viabie water bodies and most of the habitat historicaliy accessible to salmon in Washington, Oregon, Idaho, and California." Per these definitions, because Yelm Creek historically supported salmon through most of its reach, and continues to support � salmon in its lower reaches it is considered EFH. �,,, ANALYSIS OF EFFECTS ON ESA-LISTED SPECIES � Pursuant to the Code of Federal Regulations (CFR) Title 50, Subchapter 402, Sections 02 and 14(h)(2), Wetlands & Wildlife, Inc. reviewed the Action Area for potential impacts to ESA-listed species. The Action Area was examined for the potential direct and indirect effects of the proposed project, as described in ' � Section 4.1 of the FEMA Regional Guidance document. Potential direct effects include permanent clearing/grading of a habitat area, temporary clearing/grading of a habitat area during construction, permanent structures or other newly created impervious surfaces within a habitat area, modification of a stream channel �' or side channel, removal or changes in large woody debris, and diversion of water that will change the �, hydrology of the area. Potential indirect effects include the following: disrupting high or low stream flows, including impacts from stormwater runoff; contributing to sedimentation that fills in substrate; blocking a I �' corridor that connects habitat areas; increases in water body temperatures through removal of riparian � vegetation and decreased shading; disturbance or riparian vegetation; moving or removing large woody debris; destabilizing bank and modifying channel migration processes; bank stability; channel migration; � hyporheic zones; and modifying wetland areas through disturbance of adjacent vegetation or modification of hydrology. � Potential Direct Effects to ESA-listed Fish Species: No impacts to a habitat area will occur through implementation of this proposed project. This project will involve extensive clearing and grading to create the building pad and the compensatory flood storage area. � The vegetation that will be disturbed contains a high percentage of invasive species (Scots broom (Cytisus � ' � Wetlands& Wildlife, Inc. June 10, 2013 Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 10 II �^ ' � I �� I � w� scoparius, nol/Upl) and provides a relatively low level of functions. Following grading the disturbed area will be restored with native trees and shrubs. The proposed grading will occur a minimum of 450 feet away from ' known habitat for Steelhead trout (Onchorhynchus mykiss), and will occur during a portion of the year when �" the on-site channel of Yelm Creek is dry. No modifications will occur to any water body within the Action Area and no removal or changes in large woody debris (LWD) will occur. As a resuit, the proposed project will not � result in any direct effects to fish species. Potential Indirect Effects to ESA-listed Fish Species: � No disruptions or changes to the existing high or low stream flows will to occur as a result of this proposal. Through avoidance of any in-water work, the implementation of BMP erosion control measures, and the distance of the proposed work from critical habitat, we do not anticipate sediment or pollutants from the � project site entering surface waters. Therefore, we do not anticipate any water quality changes to surface waters surrounding the property. No water quality impacts are anticipated to any waters throughout the Action Area. The proposed project will not block any habitat corndors for listed species. No LWD will be impacted. � While some impacts to riparian vegetation will occur, the vegetation to be impacted contains a high percentage of non-native species.All impacted areas will be restored with native trees and shrubs, resulting in an improvement to the existing condition. The proposed project will have no impact on any natural channel � migration areas and bank stability will not be impacted in any way. This proposal will increase the vegetative species diversity and eventually the vegetative structure on the site. Therefore, the proposed project will not � result in any indirect effects to fish species. Potential Impacts to ESA-listed Wildlife Species: � Earth moving equipment used during the implementation of this project will produce temporarily elevated noise levels above the existing background sound levels. However, no listed salmonids, no terrestrial Wildlife Habitat Conservation Areas (nests) of listed avian species are located among the Action Area and no listed � terrestrial species are mapped as occurring within the Action Area. �� Due to the relatively short duration of the project and the proposed restoration measures, the temporarily = elevated noise levels are not expected to create any direct or indirect effects to any ESA-listed terrestrial or � � aquatic wildlife species. � Potential Impacts to Essential Fish Habitat(EFH): Although EFH does exist within the defined Action Area, the implementation of BMP eros�on control measures and the lack of an above-ground surface water connection alleviate the potential for negative impacts � associated with the proposed project. This project will not result in any direct or indirect impacts to EFH, and will maintain the existing condition of the site and the adjacent areas. � DETERMINATION OF EFFECTS ON ESA-LISTED SPECIES � � Coastal-Puget Sound DPS bull trout, Puget Sound ESU Chinook salmon, and Puget Sound DPS steelhead trout are not present within the Action Area due to a lack of on-site habitat requirements for these species. Therefore, the proposed project will have No Effect on Puget Sound bull trout, Puget Sound Chinook salmon, � � Wetlands& Wildlife, Inc. June 10, 2013 Weber Property--FEMA Floodplain Habitat Assessment Report City of Yelm,Washington (Tax Parcel#227192403000) Page 11 � � � FIGURE 1 : HABITAT ASSESSMENT FLOW CHART �„ NOTE: THIS DOCUMENT IS LOCATED ON PAGE 7 OF THE FEMA FLOODPLAIN HABITAT ASSESSMENT AND MITIGATION � REGIONAL GUIDANCE DOCUMENT PRODUCED IN APRIL OF 2011 FOR USE IN FEMA REGION 10 � rs rhe prz�fect in rhe Regutafeci Ftovdplain� �.�..,�.. v�s e..�_�.�..�.��_n�a w..�_,� �.: � 4 ` i � � � t-las a 8i,�tagical Evaluatron beer�prepared f for fhe pra�eef ar�d have NAAFS andlor USFI�I/S ; tfeterrttr�r�ec�concurrence with the project I � under Sectia�� 7 of fhe ES�1"? � � �-- YES `____.`^\_ l � �0 �1� Y � ts ft��development prz��et � �, an allowgd activity? �_._.__.__.__.__._.--._______._..._—._._�� YE9 � � �unduct the Assessm�emt � S1ep 1: t�str�t�e ihe Pra�ct Area � NQ Step 2:O�scribe fhe+iabitat ! Step 3:Destxit�ths Project �--_._._._____ 1 Step d:Assess the fmpaM � � �_.�m_.��.��.��r��._�.w� � Wi1t tf►�p�a;ect cac�se , � a»adver�e impac�? � : �....�V.,��.�.�.��w.�.�.�..�.,...��.--��..e._.�...,�.,_:.�� i_�._...�.._.��. wc�, ._��.,..,.......,.�.w_ �t � Pc�epare the Mitigatiott PiBt! i YE� � � ; Step 5:R�;vieav Mitigaticsn Rlternatives ° 1 ___...._.__.__�._.�__ ; Step B: Prepare The Mitigation Pian "" ` ,_.._...._ __,�...._ ...._....:.:_ _..___.__# RCdCSI�rt lfiB�fOJ� �___m ..,,.,,r _ � � to�n�ocporate the pFati s � `r�r�tigation rneasures.^_ ts the ptan accepfable? � � YES i NO j � � ,�.^... i Redes�gn the�ro�ect or Proceed with fhe praject, ; ttte mitigation measuces gefting atl requir�ci p�rmits � � 1 �F Habitat Assessment Flow Chart �W Job: N1305 , � � PREPARED FOR: MR. RANDY WEBER HABITAT ASSESSMENT FLOW CHART Drawn By: (PROPERTY OWNER) WEBER PROPERTY(CITY OF YELM, WA) Scott Spooner �P SHEET: � 26550 SE 354th PLACE THURSTON COUNTY PARCEL#22719240300 FIGURE 1 WETLANDS WILDLIFE Date: 6/10/13 � BLACK DIAMOND, WA 98010 � e„�N„m�,,,�icw,s,.ih„4 Revision#: N/A � � FIGURE 2: PROJECT VICINITY £t ACTION AREA MAP � �, � � � � � � � $ � � � � F 100' — ACTION AREA RADIUS 0 ;�� at j� FROM PROJECT SITE; �� ; �� SEE FLOODPLAIN HABITAT `�, ASSESSMENT FOR DETAILS PROJECT SITE � � � � � ` � � � � � � � \ � � � � � � � -. ��,�� , �� .� �''� `� :4,�,• ��. � II , � � � �� '�. � �� , n� � �� c� �r �. � �� ,4 � �, � �.��`� R�i i�v� �I � �4§�, S �`'�� •: �, � I � � ��.� �'��,,� ..��.... �,�� , �� ' ' �� ' �� ' � rj � �* � \- � �_�, � � �� 2 � Note: Base map provided by Google Maps. 0 Additional information drawn b Z Y � Wetlands 8 Wildlife, Inc. � 0 300 600 £tW Job: N1305 PREPARED FOR: PROJECT VICINITY £t ACTION AREA MAP Drawn By: ��+++ MR.RANDY WEBER Weber Pro ert Cit of Yelm, WA Scott Spooner �P SHEET: � (PROPERTY OWNER) p y � y � FIGURE 2 26550 SE 354th PLACE Thurston Co. Parcel #22719240300 Ddte: 06/10/13 WETLANDS WILDLIFE BLACK DIAMOND,WA 98010 e„�.�,m�,�c�,s�,��u Revision#: N/A nu � � I � �FIGURE 3: PROJECT AREA MAP � � �_ � � � � � � � ; :,� R � � ' �:, .. e�e 1� �4 (.�4 "� ��.�'7 r� o(� � ACTION AREA RADIUS OF 100' FROM PROJECT SITE PROJECT SITE � � � � � �, � � � EDGE OF 150' RIPARIAN ,� � � � HABITAT ZONE � � � � � � � - �6'�y � ti� t� � �� p�' c�� 6fi �,r,... � � �� '�� r� r�� -� � � tr_ � �, OHWM YELM CREEK � EDGE OF EXISTING ��"�` �gj�y��, � � 100-YEAR FLOODPLAIN :�� ,,� &t MAPPED FLOODWAY � �'�` I� �,� '�'�°�� TO BE MODIFIED AS SHOWN .��'�'�� , �''� �'� ON FIGURE 5 ��,� ' � �� r �r,� THE EDGE OF�HE PROTECTED �� AREA AS DEFINED IN THE FEMA �. GUIDANCE DOCUMENT EXTENDS � TO THE EDGE OF THE MAPPED � FLOODWAY I� � �� , � �� The Riparian Habitat Zone (RHZ) as defined � �' in the FEMA guidance document extends 150 feet from Note: Base map provided by Google Maps. Additional information drawn by the Ordinary High Water Mark (OHWM) of Yelm Creek, _ on both sides of the stream,° See text for discussion. � I� �, Wetlands 8 Wi(dlife, Inc. � � Z No channel mirgation hazard areas or terrestrial wildlife habitat areas are mapped as being located within the project area or protected area shown. 0 300 600 � W8W Job: N1305 PREPARED FOR• PROJECT AREA MAP �, MR.RANDY WEBER yyeber Pro ert Cit of Yelm WA) Dcott Spooner �P SHEET: (PROPERTY OWNER) p y � y � FIGURE 3 � 26550 SE 354th PLACE Thurston Co. Parcel #22719240300 Date: 06/10/13 WETLANDS�WILDLIFE BLACK DIAMOND,WA 98010 �,,,„,,,m�„�co„s„�„u Revision#: N/A ' � � �- �"� : �� . �.: �� F I��,wl!RE �� !3�� +�l�EA MAP � o � �;� ° � �;.� � �'> �,� �� 4� . 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" . , ; � ��`�� "� � SERVICEBERRY,�.�z �� sMAJORITY OF SIT DENSE NON-NATIVE, SERVIC ,$�`� BLACK LOCUST, �; DOMINATED B INVASIVE BLACKBERR BERRY AND OREGON GRAPE . � � '; SCOTCH BR00 n � � `s.�, (RETAIN VEGETATION � �� , g — ° �� ° " . o • , � � I �� IN THIS AREAj � � �: � ' . �r � �.� , w� �g �� o • ��- -. - , � ,_ � � � ' �'� � � �� '�"� � � � � � ,, , o � x � ,, �� YELM CREE � -�� ,� u � � �'�(TYPE 5 STREAn �"x� � � � �,,�� . �� T .� �, .� � �_ � , m � �F ��;� � ,„�� ; ��. �� •' �: .��°=-e,� � ��*�" �:c�.• �` ��„*�y`� `. _`�q. § �. �• . �..° ^ � �� *i . � SCFi00L '� � a;�� ;� .��, ��. � * �, �� ,;� � ` �BUSYARD K , ,�,.. 4�� °� . �� . �. ;�� .�..A; ` � �,�" � � +� �—(REGULAR � � � % �� i ��.,� ' ~' '� , �: �,HEAVY TRAFFIC) � �;�_'' x ��x�. � ��IND _ _ UST RIAL � (CENTEX PROPANE � ��.�� -�. LJ , ��.�� '�� , ��; �;� ;.� • K � -� ,� � _ :, . . , � n.� � �� i�, ANKS) -. ..r , . _ a � � . • . . • � � �. � _ x . ,� 3.: �.: � �6 . � ' r�:�� ' �. �� ' , " II �k dl,� 3 i. � � �' V � . �II I � '� � �. ro °fiT�°r, �`r � �� ',�''�. � � e ��- � � '��I I. _,k .p `� .:.� �: _. "�*�'�` #� � STORAGE UNITS � FL DPLAIN � , .�: �u CURRENT 00 �� '°°�; � ��,''(REGULAR DAILY USE) ��:�� "s�� : ,� � � "� , �x ti ��a, �AREA IS DISCONNECTED �'' -.. �,,,�� ,• � �, �' , � � ��°� � Y��:r" �* �� aFROM YELM CREEK DUE �` � �. ,..' �` � ° � �� `'�� ,� � ��0 ROADS, FILL, AND ! � ��, . fi� �,�� * . ;. � •".� � � + ; ��', .QTHER IMPERVIOUS � . +�' �� .-: " _ .� : ' � � �p SURFACES IN THIS ARE �. . 9¢ ., � . � �. ..� m,:,T= �'� '�` ��' �"�1� -�'� ��; ��'^�`� ��.'�'� '�.� _ "°�F,..� '�� "��; �.:^� ' u�' r:��t .�.s „. >;.. . , ` _ ,. .�. , �q,. '-: � � � ' .. � ( £�r k.:. "' NOte, uq�E illdJ3 �f U41�cCj �y vL�v�ic '� N '� � ' - iv�:a : " .£ ' ,YN dditional information drawn by �"� _ � �� w�� .s�� . „��; .�. �. Wet(ands & Wild(ife, Inc. '+r�, s �tl • °�� ' �',. � _ � � �� 4� , �. � ¢ � : � ' v , . : �r� �n, . � '� z. � �,�--`a '�� "� ' �r �£,.� �'�� _ � � '� '�" �� '� � � �� `x 1 1 1 . 1 1 ,"�"ik� f ,:-'�, . ' ��w . �`E; �. � :. . ,... �. � r., , � . W8W Job: N1305 PREPARED FOR• HABITAT AREA MAP � ` MR.RANDY WEBER yyeber Pro ert Cit of Yelm WA) Dcott Spooner �`P SHEET: (PROPERTY OWNER) P y � y � FIGURE 4 � 26550 SE 354th PLACE Thurston Co. Parcel #22719240300 Date: 06/10/13 WETLANDS �� WILDLIFE BLACK DIAMOND,WA 98010 e�..,nmm��c�=ui=,,,,. Revision#: N/A � I _ � FIGURE 5: PROPOSED PROJECT MAP � NOTE: PLEASE SEE ADDITIONAL PROJECT RESOURCES PREPARED BY BARGHAUSEN CONSULTING ENGINEERS,INC. PLEASE ALSO SEE THE ASSOCIATED FEMA FLOODPLAIN HABITAT ASSESSMENT REPORT(TEXT)AND THE CRITICAL AREAS REPORT 8 PROPOSED MITIGATION PLAN PREPARED BY WETLANDS Ft WILDLIFE,INC. � FOR FURTHER DISCUSSIONS REGARDING THE PROPOSED PROJECT. � I� PROPOSED CUT AREA PROPOSED BUFFER pROPOSED FILL AREA (83,350 SF IN AREA; RESTORATION ARE (83,350 SF);SEE PROJECT (132,264 SF IN AREA; 3,650 CY IN VOLUME) 3,650 CY IN VOLUME) I �� REPORTS FOR DETAILS � �. AREA OF DENSE TREES PROPOSED EASTERN EDGE OF AND SHRUB RIPARIAN HABITAT AREA (RETAIN VEGETATION ;AND FLOODPLAIN(AFTER � IN THESE AREAS) PROJECT C PLETION) � W� ,�� _ ,3 "o� �"�? h" w� �� `�1.u' .; .______ � �n � � � �, __— i � � i � �.� � � � �� — � � � � \ A � 2 O !�1 � �� . �� Z l�7 � � � � . Z � �� WETLAND A � �� , � ''" CA80'B�UFFER � � �� j �,� E YELM CREEK _ � Ir --- ` — TYPE 5 STREAM \� � (FLOWS SOUTH � � �� _ ,� � TO NORTH) �� \, EDGE OF EXISTING RIPARIAN HABITAT AREA EXISTING FEMA � AND BASE FLOOD ELEVATIO ASE FLOOD (TO BE MODIFIED THROUGH ELEVATION PROJECT PROPOSAL) PERMANENT CRITICAL AREA SIGNS ON EASTERN EXTENT OF � PROPOSED RIPARIAN HABITAT AREA(4 TOTAL) ', � � ' � � WETLAND � PROPOSED CUT Ft RESTORATION AREA � � PROPOSED FILL � --- RIPARIAN HABITAT AREA O Z ' � � DATA POINTS (4 TOTAL) ■ PROPOSED CRITICAL AREA SIGNS 0 200 400 � � WEtW Job: N1305 ' ,,,, PREPARED FOR: PROPOSED PROJECT MAP Drawn B ° MR.RANDY WEBER y° MAP SHEET: � (PROPERTY OWNER) Weber Property (City of Yelm, WA) Scott Spooner FIGURE 5 26550 SE 354th PLACE Thurston Co. Parcel #22719240300 Date: 06/10/13 WET'LANDS WILDLIFE BLACK DIAMOND,WA 98010 �^ e...;�mm�.,��c.�.,ah.,., Revision#: N/A Y� I ' � 7.0 OTHER PERMITS Other permits for this project include: I � NPDES Permit—Washington State Department of Ecology. � ' ' � ' ' ' � ' , ' , ' ' ' , � 12433.006.doc �. � � � 8.0 OPERATION AND MAINTENANCE MANUAL This project does not propose to install any facilities that will require maintenance, and as such an � Operation and Maintenance Manual is not necessary. � � � ' � , , � � ' � , ' � , � II � 12433.006.doc � I i � 9.0 FLOODPLAIN ANALYSIS � The Weber property is 7.57 acres in size, and is bound on the west by Yelm Creek and on the east by Rhoton Road SE. Yelm Creek runs south to north approximately 1,000 feet west of the east property �ine. The majority of the site has been cleared, but there are small areas of native � vegetation. Please see the FEMA Floodplain Habitat Assessment prepared by Wetlands & Wildlife, Inc., dated June 10, 2013 for more information about retention of native vegetation and proposed restoration and plantings for disturbed areas. �, Some of the subject property needs to be filled in order for the developable portion of the property on the easterly half of the site to be above the BFE of Yelm creek as depicted by FEMA map number 53067C0353E, Panel 0353E, effective October 16, 2012 -- Please see the enclosed FIRM included as Appendix A. Once the fill has been placed on-site, an application for a LOMR- �, F will be submitted to FEMA to remove the mandatory Federal flood insurance purchase requirement—see the enclosed draft FEMA LOMR-F application included as Appendix Bo � The site is shown to be within an AE zone floodplain for Yelm creek at both the east and west edges of the property. It is not possible to provide vehicular access to the site (via the public road, Rhoton Road SE)without filling within the floodplain. The FIRM shows the BFE at the west edge of the site at elevation 333, and shows the east portion of the site to be within an AE zone of �, ineffective flow with a BFE of 335. An Ineffective flow area is an area that stores flood waters, but has negligible conveyance of flood waters. The site proposes to fill on the east edge of the site within the area of ineffective flow, and to provide an equivalent amount of compensatory flood � storage on the west side of the site. The project proposes no net fill to the floodplain. See �� areas of fill and compensatory storage in Appendix C — FEMA Grading Exhibit. FEMA does not require compensatory storage when fill is placed within a flood zone, but the project proposes to ' �" exceed the minimum FEMA requirements in an effort to minimize its impact to the adjacent flood � zone BFE. Since the proposed fill is in an area of ineffective flow, and the project proposes equivalent compensatory storage, the project will have very little or a negligible impact to the ' � floodplain limits or BFE. �r, � � � � � � ' � I�!, � 12433.006.doc '' �, I �, . � Appendix A FEMA FIRM Map � � � � � � � � �. � � � � � � � r �: ' � � ' � � r � , r. 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Appendix B � A L M R-F Draft FEM C O � Application R �+ � R' I�r � P r F i � � � � � r � DEPARTMENT OF HOMELAND SECURITY-FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.e.NO.1660-0015 � PROPERTY INFORMATION FORM ExpiresFebruary28,2014 � PAPERWORK BURDEN DISCLOSURE NOTICE Public reporting burden for this data collection is estimated to average 1.63 hours per response. The burden estimate includes the time for reviewing instructions, searching existing data sources,gathering and maintaining the needed data,and completing and submitting the form. This collection is required to obtain or retain � benefits. You are not required to respond to this collection of information unless a valid OMB control number is displayed on this form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to:Information Collections Management,Department of Homeland Security,Federal Emergency Management Agency,1800 South Bell Street,Arlington,VA 20598-3005,Paperwork Reduction Project(1660-0015). NOTE:Do not send your completed form to this address. This form may be completed by the property owner,property owner's agent,licensed land surveyor,or registered professional engineer to support a request for a � Letter of Map Amendment(LOMA),Conditional Letter of Map Amendment(CLOMA),Letter of Map Revision Based on Fill(LOMR-F),or Conditional Letter of Map Revision Based on Fill(CLOMR-F)for existing or proposed,single or multiple lots/structures. In order to process your request,all information on this form must be completed in its entirety,unless stated as optional. Incomplete submissions will result in processing delays. Please check the item below that describes your request: � ❑ LOMA A letter from DHS-FEMA stating that an existing structure or parcel of land that has not been elevated by fill(natural grade)would not be inundated by the base flood. � ❑ CLOMA A letter from DHS-FEMA stating that a proposed structure that is not to be elevated by fill(natural grade)would not be inundated by the base flood if built as proposed. ❑ LOMR-F A letter from DHS-FEMA stating that an existing structure or parcel of land that has been elevated by fill would not be inundated by the base flood. � A letter from DHS-FEMA stating that a parcel of land or proposed structure that will be elevated by fill ❑X CLOMR-F would not be inundated by the base flood if fill is placed on the parcel as proposed or the structure is built as proposed. � F111 is defined as material from any source(including the subject property)placed that raises the ground to or above the Base Fiood Elevation(BFE). The common construction practice of removing unsuitable existing material(topsoil)and backfilling with select structural material is not considered the placement of fill if the practice does not alter the existing(natural grade)elevation,which is at or above the BFE. Fill that is placed before the date of the first National Flood Insurance Program(NFIP)map showing the area in a Special Flood Hazard Area(SFHA)is considered natural grade. � Has fill been placed on your property to raise ground that was previously below the BFE? ❑ Yes Q No If yes,when was fill placed? / month/year � Will fill be placed on your property to raise ground that is below the BFE? X❑ Yes* ❑ No If yes,when will fill be placed? 08 /2013 month/year � *If yes,Endangered Species Act(ESA)compliance must be documented to FEMA prior to issuance of the CLOMR-F determination(please refer page 4 to the MT-1 instructions). 1. Street Address of the Property(if request is for multiple structures or units,please attach additional sheet referencing each address and enter � street names below): xxx Rhoton Road SE north of NP Road SE 2, Legal description of Property(Lot,Block,Subdivision or abbreviated description from the Deed): � Assessor's Parcel No. 227-19-240300 Parcel 8, City of Yelm Boundary Line Adjustment No. BLA-05-0513-YL, as recorded underAuditor's File No. 3935810, Records of Thurston County, Washington. 3. Are you requesting that a flood zone determination be completed for(check one): � ❑ Structures on the property? What are the dates of construction? (MM/YYYY) ❑X A portion of land within the bounds of the property?(A certified metes and bounds description and map of the area to be removed,certified by a licensed land surveyor or registered professional engineer,are required.For the preferred format of metes and bounds descriptions,please refer to the MT-1 Form 1 Instructions.) ❑ The entire legally recorded property? � 4. Is this request for a(check one): ❑ Single structure � Single lot � ❑ IVlultiple structures(How many structures are involved in your request?List the number: ) ❑ Multiple lots(How many lots are involved in your request?List the number: ) �„ DHS-FEMA Form 086-0-26,FEB 11 Property Information Form MT-1 Form 1 Page 1 of 2 � � In addition to this form(MT-1 Form 1),please complete the checklist below. ALL requests must include one copy of the following: � Copy of the effective fIRM panel on which the structure and/or property location has been accurately plotted(property inadvertently located in the NFIP regulatory floodway will require Section B of MT-1 Form 3) � � Copy of the Subdivision Plat Map for the property(with recordation data and stamp of the Recorder's Office) OR � Copy of the Property Deed(with recordation data and stamp of the Recorder's Office),accompanied by a tax assessor's map or other certified map � showing the surveyed location of the property relative to local streets and watercourses. The map should include at least one street intersection that is shown on the FIRM panel, � Form 2—Elevation Form. If the request is to remove the structure,and an Elevation Certificate has already been completed for this property,it may be submitted in lieu of Farm 2. If the request is to remove the entire legally recorded property,or a portion thereof,the lowest lot elevation must be provided on Form 2. � � Please include a map scale and North arrow on all maps submitted. � For LOMR-Fs and CLOMR-Fs,the following must be submitted in addition to the items listed above: � Form 3—Community Acknowledgment Form For CLOMR-Fs,the following must be submitted in addition to the items listed above: A�" �Documented ESA compliance,which may include a copy of an Incidental Take Permit,an Incidental Take Statement,a"not likely to adversely affect" determination from the National Marine Fisheries Service(NMFS)or the U.S.Fish and Wildlife Service(USFWS),or an official letter from NMFS or USFWS concurring that the project has"No EffecY'on proposed or listed species or designated critical habitat.Please refer to the MT-1 instructions for additional information. Please do not submit original documents. Please retain a copy of all submitted documents for your records. � DHS-FEMA encoureges the submission of all required data in a digital format(e.g.scanned documents and images on Compact Disc[CD]). Digital � submissions help to further DHS-FEMA's Digital Vision and also may facilitate the processing of your request. Incomplete submissions will result in processing delays.For additional information regarding this form,including where to obtain the supporting documents listed above,please refer to the MT-1 Form Instructions located at http://www.fema.�ov/plan/prevent/fhm/dl mt-1.shtm. � Processing Fee(see instructions for appropriate mailing address;or visit http://www.fema.gov/fhm/frm fees.shtm for the most current fee schedule) Revised fee schedules are published periodically,but no more than once annually,as noted in the Federal Register. Please note: single/multiple � lot(s)/structure(s)LOMAs are fee exempt. The current review and processing fees are listed below: Check the fee that applies to your request: ❑$325(single lot/structure LOMR-F following a CLOMR-F) � ❑$425(single lot/structure LOMR-F) �r Q$500(single lot/structure CLOMA or CLOMR-F) � ❑$700(multiple lot/structure LOMR-F following a CLOMR-F,or multiple lot/structure CLOMA) ❑$800(multiple lot/structure LOMR-F or CLOMR-F) � Please submit the Payment Information Form for remittance of applicable fees. Please make your check or money order payable to: National Flood Insurance Program. All documents submitted in support of this request are correct to the best of my knowledge. I understand that any false statement may be punishable by fine /" or imprisonment under Title 18 of the United States Code,Section 3001. ApplicanYs Name(required): RBndy Weber Company(if applicable): Mailing Address(required): 26550 S.E. 354th P/aCe Daytime Telephone No.(required): (206� 510-5563 Black Diamond, WA 98010 � E-Mail Address(optional):�By checking here you may receive Fax No.(optional): correspondence electronically at the email address provided): � nveber@novastar.com 1�• Date(required) Signature of Applicant(required) DHS-FEMA Form 086-0-26,FEB 11 Property Information Form MT-1 Form 1 Page 2 of 2 � DEPARTMENT OF HOMELAND SECURITY-FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.B.No.1660-0015 � ELEVATION FORM ExpiresFebruary28,2014 PAPERWORK BURDEN DISCLOSURE NOTICE � Public reporting burden for this data collection is estimated to average 1.25 hours per response. The burden estimate includes the time for reviewing instructions, searching existing data sources,gathering and maintaining the needed data,and completing and submitting the form. This collection is required to obtain or retain benefits. You are not required to respond to this collection of information unless a valid OMB control number is displayed on this form. Send comments regarding the � accuracy of the burden estimate and any suggestions for reducing this burden to:Information Collections Management,Department of Homeland Security,Federal Emergency Management Agency,1800 South Bell Street,Arlington,VA 20598-3005,Paperwork Reduction Project(1660-0015). NOTE:Do not send your completed form to this address. This form must be completed for requests and must be completed and signed by a registered professional engineer or licensed land surveyor. A DHS-FEMA National Flood Insurance Program(NFIP)Elevation Certificate may be submitted in lieu of this form for single structure requests. � For requests to remove a structure on natural grade OR on engineered fill from the Special Flood Hazard Area(SFHA),submit the lowest adjacent grade(the lowest ground touching the structure),including an ottoched deck or garage.For requests to remove an entire parcel of land from the SFHA,provide the lowest lot elevation; or,if the request involves an area described by metes and bounds,provide the lowest elevation within the metes and bounds description.All measurements are to be � rounded to nearest tenth of a foot. In order to process your request,all information on this form must be completed in its entirety. Incomplete submissions will result in processing delays, r 1. NFIP Community Number:530310 Property Name or Address: Weber Property-Rhoton Road SE 2. Are the elevations listed below based on ❑X existing or ❑proposed conditions? (Check one) 3. For the existing or proposed structures listed below,what are the types of construction? (check all that apply) ❑crawl space❑slab on grade ❑basement/enclosure ❑other(explain) � 4. Has DHS-FEMA identified this area as subject to land subsidence or uplift?(see instructions) ❑Yes �No � If yes,what is the date of the current re-leveling? / (month/year) 5. What is the elevation datum?Q NGVD 29 Q NAVD 88 ❑Other(explain) If any of the elevations listed below were computed using a datum different than the datum used for the effective Flood Insurance Rate Map w (FIRM)(e.g.,NGVD 29 or NAVD 88),what was the conversion factor? Local Elevation+/-ft.=FIRM Datum 6. Please provide the Latitude and Longitude of the most upstream edge of the structure(in decimal degrees to the nearest fifth decimal place): Indicate Datum: ❑WGS84 ❑ NAD83 ❑ NAD27 Lat. . Long. . Please provide the Latitude and Longitude of the most upstream edge of the property(in decimal degrees to the nearest fifth decimal place): r. Indicate Datum: ❑WG584 X❑ NAD83 ❑ NAD27 Lat. 46•94630° Long. -122•60424° � Lowest Block Lowest Lot Adjacent Base Flood Address Lot Number Number Elevation* Grede To Elevation BFE Source � Structure XXX Rhofon Road SE 330.0 333.0-335.00 F/RM 53067C0353E This certification is to be signed and sealed by a licensed land surveyor,registered professional engineer,or architect authorized by law to certify elevation � information. All documents submitted i�support of this request are correct to the best of my knowledge. I understand that any false statement may be punishable by fine or imprisonment under Title 18 of the United States Code,Section 1001. .. Certifier's Name: Hal P. GlUbb License No.: 23g�5 Expiration Date: 6/10/2015 company rvame: garghausen Consulting Engineers, Inc. Telephone No.: �425) 251-6222 Emaii: hgrubb@barghausen.com Fax No. (425) 251-8782 Signature: Date: � � *For requests involuing a portion of property,include the lowest ground elevation within �- the metes and bounds description. Seal (Optlollal� Please note:If the Lowest Adjaeent Grade to Structure is the only elevation provided,a determination will be issued for the structure only. DHS-EEMA Form 086-0-26A,FEB 11 Elevation Form MT-1 Form 2 Page 1 of 2 � Continued from Page 1. � Lowest Adjacent Lowest Lot Base flood Address Lot Number Block Number Elevation* Grade To Elevation BFE Source Structure � � � � _ P' �w. � : !'" � �< This certification is to be signed and sealed by a licensed land surveyor,registered professional engineer,or architect authorized by law to certify elevation � information. All documents submitted in support of this request are correct to the best of my knowledge. I understand that any false statement may be punishable by fine or imprisonment underTitie 18 of the United States Code,Section 1001. Certifier's Name: License No.: Expiration Date: Company Name: Telephone No.: Email: Fax No. � Signature: Date: � *For requests involving a portion of property,inciude the lowest ground elevation within �e the metes and bounds description. Seal (optlOndl� Please note:If the Lowest Adjacent Grade to Structure is the only elevation provided,a � determination will be issued for the structure only. � � ` DHS-FEMA Form 086-0-26A,FEB 11 Elevation Form MT-1 Form 2 Page 2 of 2 � DEPARTMENT OF HOMELAND SECURITY-FEDERAL EMERGENCY MANAGEMENT AGENCY O.M.e.NO.1660-0015 COMMUNITY ACKNOWLEDGMENT FORM Expires February28,2014 � PAPERWORK BURDEN DISCLOSURE NOTICE � Public reporting burden for this data collection is estimated to average 1.38 hours per response. The burden estimate includes the time for reviewing instructions,searching existing data sources,gathering and maintaining the needed data,and completing � and submitting the form. This collection is required to obtain or retain benefits. You are not required to respond to this collection of information unless a valid OMB control number is displayed on this form. Send comments regarding the accuracy of the burden estimate and any suggestions for reducing this burden to: Information Collections Management,Department of Homeland Security,Federal Emergency Management Agency,1800 South Bell Street,Arlington,VA 20598-3005, Paperwork � Reduction Project(1660-0015). NOTE: Do not send your completed form to this address. This form must be completed for requests involving the existing or proposed placement of fill(complete Section A)OR to provide acknowledgment of this request to remove a property from the SFHA which was previously located within the regulatory floodway(complete Section B). � This form must be completed and signed by the official responsible for floodplain management in the community. The six digit NFIP community number and the subject property address must appear in the spaces provided below. Incomplete submissions will result in processing delays.Please refer to the MT-1 instructions for additional information about this form. � Community Number: 530310 Property Name or Address: Weber Property-Rhoton Road SE A. REQUESTS INVOLVING THE PLACEMENT OF FILL As the community official responsible for floodplain management,I hereby acknowledge that we have received and reviewed this Letter of Map �, Revision Based on Fill(LOMR-F)or Conditional LOMR-F request. Based upon the community's review,we find the completed or proposed project meets or is designed to meet all of the community floodplain management requirements,including the requirement that no fill be placed in the � regulatory floodway,and that all necessary Federal,State,and local permits have been,or in the case of a Conditional LOMR-F,will be obtained. For Conditional LOMR-F requests,the applicant has or will document Endangered Species Act(ESA)compliance to FEMA prior to issuance of the Conditional LOMR-F determination.For LOMR-F requests,I acknowledge that compliance with Sections 9 and 10 of the ESA has been achieved independently of FEMA's proeess.Section 9 of the ESA prohibits anyone from"taking"or harming an endangered species. If an action might harm �° an endangered species,a permit is required from U.S.Fish and Wildlife Service or National Marine Fisheries Service under Section 10 of the ESA. For actions authorized,funded,or being carried out by Federal or State agencies,documentation from the agency showing its compliance with Section 7(a)(2)of the ESA will be submitted.In addition,we have determined that the land and any existing or proposed structures to be removed from the SFHA are or will be reasonably safe from flooding as defined in 44CFR 65.2(c),and that we have available upon request by DHS-FEMA,all analyses and documentation used to make this determination. For LOMR-F requests,we understand that this request is being forwarded to DHS- � FEMA for a possible map revision. Community Comments: � �p Community Official's Name and Title: (Please Print or Type) Telephone No.: Grant Beck, Community Development Director (360)458-8408 Community Name: Community Official's Signature: (required) Date: � City of Yelm � B. PROPERTY LOCATED WITHIN THE REGULATORY FLOODWAY Not Applicable As the community official responsible for floodplain management,I hereby acknowledge that we have received and reviewed this request for a LOMA. We understand that this request is being forwarded to DHS-FEMA to determine if this property has been inadvertently included in the � regulatory floodway. We acknowledge that no fill on this property has been or will be placed within the designated regulatory floodway. We find that the completed or proposed project meets or is designed to meet all of the community floodplain management requirements. Community Comments; � Community Official's Name and Title: (Please Print or Type) Telephone No.: , w� Community Name: Community Official's Signature(required): Date: DHS-FEMA Form 086-0-26B,FEB 11 Community Acknowledgment Form MT-1 Form 3 Page 1 of 1 � FEDERAL EMERGENCY MANAGEMENT AGENCY � PAYMENT INFORMATION FORM Community Name: 530310 Project Identifier; Weber Property-Rhoton Road SE r�.. THIS FORM MUST BE MAILED,ALONG WITH THE APPROPRIATE FEE,TO THE ADDRESS BELOW OR FAXED TO THE FAX NUMBER � BELOW. Type of Request: � LOMC Clearinghouse ❑X MT-1 application 7390 Coca Cola Drive ❑ MT-2 application} Suite 204 � Hanover, MD 21076 Attn.: LOMA Manager �, FEMA Project Library ❑ EDR application � 847 South Pickett St. � Alexandria,VA 22304 FAX(703)212-4090 �" Request No.: (if known) Amount: %n ❑ INITIAL FEE* ❑ FINAL FEE ❑ FEE BALANCE** ❑ MASTER CARD ❑ VISA ❑ CHECK ❑ MONEY ORDER , �* *Note; Check only for EDR and/or Alluvial Fan requests(as appropriate). **Note:Check only if subrnitting a corrected fee for an ongoing request. rr,; COMPLETE THIS SECTION ONLY IF PAYING BY CREDIT CARD CARD NUMBER EXP. DATE � � — — — m m 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Month Year � Date Signature � NAME(AS ITAPPEARS ON CARDJ: (please print or type) � ADDRESS: (for your credit card receipt-please �A print or type) � DAYTIIVIE PHONE: � DHS-FEMA Form 086-0-26B,FEB 11 Community Acknowledgment Form MT-1 Form 3 Page 1 of 1 . _ _ ' � APPLICATION FORMS FOR CONDITIONAL AND FINAL LETTERS OF MAP AMENDMENT AND LETTERS OF MAP REVISION BASED ON FILL OMB Control Number i66o-ooi5. Expires Feb a8, aoiq. w� General Background Information In 1968,the U.S.Congress passed the National Flood Insurance Act,which created the National Flood Insurance Program � (NFIP).The NFIP was designed to reduce future flood losses through local floodplain management and to provide protection for property owners against potential losses through an insurance mechanism that allows a premium to be paid for the protection of those most in need.The creation of the NFIP represented a major shift in Federal strategy from previous structural flood-control and disaster relief programs. � As part of the agreement for making flood insurance available to a community,the NFIP requires the community to adopt � floodplain management ordinances that meet certain minimum requirements intended to reduce future flood losses.The community official or agency responsible for floodplain management in a community may be able to provide information that would be useful to a requester.This official or agency usually is responsible for engineering, public works,flood control,or planning in the community as well. � Use of Application Forms The Department of Homeland Security's Federal Emergency Management Agency(FEMA) implemented the use of � application forms for requesting revisions or amendments to NFIP maps for two reasons. First, because the forms provide a step-by-step process for requesters to follow and are comprehensive, requesters are assured of providing all of the necessary information to support their requests without having to go through an iterative process of providing additional � information in a piecemeal fashion,which can result in a time-consuming and cost-intensive process.Second, use of the forms ensures that the requesters'submissions are complete and more logically structured,and generally allows DHS-FEMA to complete its review in a shorter timeframe. � The application forms included in this package were designed to assist requesters(community officials, individual property owners,and others) in gathering the information DHS-FEMA needs to determine whether property(parcels of land or � structures) is likely to be flooded during the flood event that has a 1-percent-annual-chance of being equaled or exceeded in any given year(base flood). Lands that are at risk of being inundated by the base flood are called Special Flood Hazard Areas(SFHAs). � The forms in this package shall be used to request Letters of Map Amendment(LOMAs),Conditional Letters of Map Amendment(CLOMAs), Letters of Map Revision Based on Fill (LOMR-Fs),and Conditional Letters of Map Revision Based on Fill(CLOMR-Fs),as defined below. Please note that not all of the forms apply to every request.Only those forms that apply � to the request should be submittedo LOMA A letter from DHS-FEMA stating that an existing structure or parcel of land that has not been � elevated by fill(natural grade)would not be inundated by the base flood. CLOMA A letter from DHS-FEMA stating that a proposed structure that is not to be elevated by fill(natural � grade)would not be inundated by the base flood if built as proposed. LOMR-F A letter from DHS FEMA stating that an existing structure or parcel of land that has been elevated by fill would not be inundated by the base flood. � CLOMR-F A letter from DHS-FEMA stating that a parcel of land or proposed structure that will be elevated by fill would not be inundated by the base flood if fill is placed on the parcel as proposed or the � structure is built as proposed. If the request is being made for a LOMA to be issued on a single residential property,the MT-EZ form,entitled "Application Form for Single Lot or Structure,Amendments to National Flood Insurance Program Maps," may be used instead of the � forms in this package. Forms for this purpose may be downloaded from our website at http://www.fema.gov/plan/prevent/fhm/dl mt-ez.shtm.This form is available in both an English and Spanish version. � Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 1 ' � A fast alternative to using the MT-1 application is eLOMA. eLOMA is a web-based application that provides licensed land surveyors and professional engineers a system to submit simple LOMA requests to FEMA. Many LOMA requests can be }�'" submitted to FEMA using eLOMA.You can find additional information about eLOMA, including the types of LOMA requests L that qualify for the eLOMA process,at http://hazards.fema.gov. �� The forms in this package and the form entitled "Application Form for Single Lot or Structure,Amendments to National Flood Insurance Program Maps,"shall not be used in the following instances: • Requests involving changes in Base Flood Elevations(BFEs); • � • Requests involving changes in regulatory floodway boundary delineations; • Requests for properties in alluvial fan areas; � • Requests involving property and/or structures that have been elevated by fill placed within the regulatory floodway,channelization projects, bridge/culvert replacement projects,or other flood control improvements;or �•� • Requests involving changes in coastal high hazard areas(V zones). For such requests,the community must submit the request to DHS-FEMA in accordance with Title 44,Chapter I,Code of Federal Regulations(CFR), Part 65 of the NFIP regulations,which is available online at http://www.access.gpo.gov/nara/cfr/waisidx 02/44cfrvl 02.html, using the separately published MT-2 application forms �, package entitled "Application Forms and Instructions for Conditional Letters of Map Revision and Letters of Map Revision." Forms for this purpose may be downloaded from our website at http://www.fema.�ov/plan/prevent/fhm/dl mt-2.shtm. � Please note that the forms in this package may be used for property that has been inadvertently included in a V zone or the regulatory floodway. However, if the property is to be removed from a V zone, it must not be located seaward of the � landward toe of the primary frontal dune. For additional assistance in completing these forms,you may consult the LOMA Tutorial,available on DHS-FEMA's Internet site at:http://www.fema.gov/plan/prevent/fhm/ot Imreq.shtm. �. Data Submission Requirements � In accordance with the NFIP regulations, DHS-FEMA will use the information provided by these application forms to make a determination on whether a property(parcel(s)of land or a structure(s))is located within a designated SFHA. In certain instances,additional data that are not referenced on these forms may be required,A DHS-FEMA representative will notify � the requester of any additional requirements. DHS-FEMA encourages the submission of the required data in digital format(e.g.scanned documents on a CD).This may help expedite the processing of your request. � A licable Re ulations PP g The regulations pertaining to LOMAs,CLOMAs, LOMR-Fs,and CLOMR-Fs are presented in Title 44,Chapter I,CFR, Parts 65 and 70,which is available online at http://www.access.gpo.gov/nara/cfr/waisidx 02/44cfrvl 02.html.The purpose of Part 70 is to provide an administrative procedure whereby DHS-FEMA will review information submitted by an owner or � lessee of property who believes that their property has been inadvertently included in a designated SFHA. Part 70 provides information about the technical difficulty of accurately delineating the SFHA boundaries on a NFIP map for a community. Part 70 procedures shall not apply if the topography has been altered to raise the original ground to or above the BFE since the effective date of the first NFIP map [i.e.,a Flood Insurance Rate Map(FIRM)or Flood Hazard Boundary Map]showing � the property to be within the SFHA. Requests involving changes in topography(such as the placement of fill)are handled under the procedures described in Part 65. � �" Instructions MT-1 Forms (086-0-26,086-0-26A,086-0-26B) FEB 11 2 � � Fee Requirements Title 44,Chapter I,CFR, Part 72 of the NFIP regulations,which is available online at http://www.access.gpo.gov/nara/cfr/waisidx 02/44cfrvl 02.html, presents information regarding the reimbursement � procedure initiated by DHS-FEMA to allow for the recovery of costs associated with the review of requests for CLOMAs, CLOMR-Fs,and LOMR-Fs via a review and processing fee.There is no review and processing fee for requests for single/multiple, lot/structure LOMAs. � Revised fee schedules are published periodically, but no more than once annually,as a notice in the Federal l7egister. For the most up-to-date fee schedule, please contact the DHS-FEMA Map Information eXchange(FMIX)toll free at 1-877-FEMA �"" MAP(1-877-336-2627)or consult the DHS-FEMA Internet site at http://www.fema.gov/plan/prevent/fhm/frm fees.shtm. �r Payment must be submitted in the form of a check or money order, made payable in U.S.funds to the National Flood Insurance Program,or by credit card payment. In addition,the requester must complete the Payment Information Form. � The payment should be mailed together with the application and supporting data to the address listed in the Address for Submitting Requests section of these instructions. � Basis of Determination If no fill has been placed, DHS-FEMA's determination as to whether the SFHA designation may be removed from the structure(s)on a property will be based on a comparison of the BFE with the elevation of the Lowest Adjacent Grade to the w, structure(lowest ground touching the structure) including any attached decks or garage. If fill has been placed, DHS-FEMA's determination will be based on a comparison of the BFE with the elevation of the lowest adjacent grade to the structure � (lowest ground touching the structure)including any attached decks or garage and a completed Community Acknowledgment Form (see instructions for the Community Acknowledgment Form [Form 3]for more information). �„ For DHS-FEMA to remove the SFHA designation from a legally defined property or portion of property that does not have a structure on it,the elevation of the lowest ground on the property must be at or above the BFE. Please note the following special considerations that may affect DHS-FEMA's determination: � • In areas of shallow/sheet flooding(Zone AO),the elevation of the Lowest Adjacent Grade(including deck posts)of the structure(s)must be above the surrounding grade by an amount equal to or greater than the depth shown on the NFIP map. In addition,adequate drainage paths are required to guide floodwaters around and away from the � structure(s);the structure(s)should be on an elevated pad within the Zone AO area.With your application package,in addition to elevation information regarding the structure(s),provide a map showing the topographic data of the � property and the immediate surrounding area,and the location of any structure(s)existing on the property(certified by a registered professional engineer or licensed land surveyor)to demonstrate that the above criteria have been met. '� • If the lowest floor of a building has been elevated on posts,piers,or pilings above the BFE and any portion of the structure(i.e., posts,pilings,or piers)is still below the BFE,the building will not be removed from the SFHA. � Response Timeframe In accordance with the procedures of Title 44,Chapter 1,CFR, Part 72,which is available online at http://www.access.�po.gov/nara/cfr/waisidx 02/44cfrvl 02.html, DHS-FEMA will notify the requester of the � determination in writing within 60 days of the date of receipt of all required data. Information about the status of active Letter of Map Change(LOMC) requests is available from DHS-FEMA's Mapping information Platform (MIP)at � https://hazards.fema.gov.The MIP allows requesters to search Open LOMCs by entering their Project(Case) Number and Project Type to find out the status of their request. From the MIP Home Page requesters should click on Tools&Links, Public Reports and select Public Reports from the Report Category dropdown. � �" Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 3 ' Effect on Insurance Purchase Requirements � Although DHS-FEMA may issue a LOMA or LOMR-F removing a structure(s)from the SFHA, it is the lending institution's � prerogative to require flood insurance,as a condition of a loan, if it deems such action appropriate. Historically,about 25% of all flood claims occur in areas outside of the SFHA. Property owners are strongly encouraged to convert their existing policy,using the premiums already paid for that policy,to a lower-cost Preferred Risk Policy(PRP),which is available for .. � structures located outside the SFHA. For more information about the PRP,contact your agent or broker or visit http://floodsmart.gov/prp. If the lending institution agrees to waive the flood insurance purchase requirement for a structure,the property owner is eligible for a full refund of the premium paid for the current policy year, provided that no claim is pending or has been paid - �, on the policy in question during the same policy year. If the property owner has been required to renew his or her policy during a period when a revised NFIP map was being printed,the premium will be refunded for an additional year.To initiate � processing of the refund,the property owner should provide the LOMA or LOMR-F and evidence of the waiver of the flood insurance requirement from the lending institution to the insurance agent or broker who sold the policy. � Conditional Determinations To qualify for a CLOMA or CLOMR-F,the proposed project must meet the same criteria as those required for a LOMA or LOMR-F.After construction is completed or fill is placed,certified as-built information must be submitted to DHS-FEMA for � a LOMA or LOMR-F to be issued.The NFIP regulations do not require that a CLOMA or CLOMR-F be requested and issued for a proposed project.Check with local community officials to see if they are required. Property owners and developers should note that a CLOMA or CLOMR-F does not remove the mandatory purchase of flood � insurance requirements,it merely provides comment on the proposed plan and does not revise or amend the NFIP map. Once the project has been completed another application will have to be submitted with the as built conditions to receive a � LOMA or a LOMR-F which in turn removes the federal requirements for mandatory purchase of flood insurance. It also does not relieve Federal agencies of the need to comply in carrying out their responsibilities for providing federally undertaken, financed,or assisted construction and improvements or in their regulating and licensing activities, in accordance with the provisions of Executive Order 11988(http://www.fema.gov/plan/ehp/ehplaws/eo11988.shtm), �- Endangered Species Act Compliance � CLOMR-F applicants are responsible for documenting to FEMA that Endangered Species Act(ESA)compliance has been achieved prior to FEMA's review of a CLOMR-F application. ESA compliance may be documented by submitting to FEMA a copy of an Incidental Take Permit,an Incidental Take Statement,a "not likely to adversely affect"determination from the � National Marine Fisheries Service(NMFS)or the U.S. Fish and Wildlife Service(USFWS),or an official letter from NMFS or USFWS concurring that the project has"No Effect"on proposed or listed species or designated critical habitat,The applicant may begin by contacting a NMFS or USFWS office,State wildlife agency office,or independent biologist to identify whether threatened or endangered species exist on the subject property and whether the project associated with the � CLOMR-F request would adversely affect species or designated critical habitat.These entities are also available to discuss questions pertaining to listed species and ESA compliance. If potential adverse impacts could occur,then NMFS or USFWS may require changes to the proposed activity and/or mitigation. � For CIOMA, LOMA,and LOMR-F requests involving floodplain activities that have occurred already, private individuals and local and state jurisdictions are required to comply with the ESA independently of FEMA's process. � These requests do not provide the same opportunity as CLOMR-Fs for FEMA to comment on the project because CLOMAs and LOMAs do not involve a physical modification to the floodplain and because LOMR-Fs are issued only after the physical action has been undertaken in the floodplain. � Additional information about the ESA and these requirements is available on http://www.fema.�ov/library/viewRecord.do?id=4312 or by requesting a copy frorn the DHS-FEMA Map Information eXchange(FMIX)toll free at 1-877-FEMA MAP(1-877-336-2627).Although FEMA's staff is not � available to assist with this process, NMFS and the USFWS both have staff available around the country to answer questions about threatened and endangered species and ESA compliance. �'" Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 4 � � Address for Submitting Requests Please submit all application forms and data to support a request for a flood zone determination, including any applicable fees to the address listed below.Incomplete submissions will result in processing delays. DHS-FEMA encourages the submission of all required data in digital format(e.g.scanned documents on a CD). � Mail your request to... LOMC Clearinghouse � 7390 Coca Cola Drive, Suite 204 Hanover, MD 21076 � Attn.: LOMA Manager � FEMA REGIONS �s � _ � � � � `� _ �- �} �q�'�,' , � ,,_ ., � � , .` � f I�dtlpliN — — "� �, Z Yr, ir * -_'�—�� - �. � � � � ' � Instructions MT-1 Forms (086-0-26,086-0-26A,086-0-26B) FEB 11 1 � INSTRUCTIONS FOR COMPLETIIVG THE PROPERTY IIVFORMATION FORM (FORM 1) � General Instructions � The Property Information Form (Form 1)may be completed by the property owner,or on behalf of the property owner by authorized persons including but not limited to;the property owner's agent, licensed land surveyor,or registered professional engineer to support a request for a Letter of Map Amendment(LOMA),Conditional Letter '" of Map Amendment(CLOMA), Letter of Map Revision Based on Fill (LOMR-F),or Conditional Letter of Map Revision Based on Fill (CLOMR-F)for existing or proposed,single or multiple lots/structures. Before completing this form,the requester must obtain the following documents from the County/Parish Clerk, Recorder,or Register of Deeds for the community: ir • A copy of the Deed for the property,showing the recordation information(e.g., Book/Volume and Page � numbers or pocument/Instrument number)containing the recorder's seal and recordation date, accompanied by a tax assessor's or other suitable map showing the surveyed location of the property. OR � • A copy of the Plat Map for the property,showing the recordation information(e.g.,Book/Volume and Page numbers or pocument/Instrument number)and containing the recorder's seal and recordation date. The requester also must obtain a photocopy of the effective FIRM panel(including the Title Block)that shows the area in which the property is located.The FIRM should be available at the community map repository or from the � community official or agency responsible for floodplain management. However,digital copies of the FIRM Index and FIRM panels may be ordered from the Map Service Center(MSC),for a nominal fee.To place orders from the MSC,go to their Internet site:http://www.msc.fema.gov.A FIRMette,which can be printed free of charge from the MSC website, may be submitted in lieu of a photocopy of the FIRM. . � This site allows requesters to search the MSC for maps and other technical data historically available from the MSC online. Requesters can search by the three following criteria:Catalog, Map Search,and Quick Order.Catalog allows requesters to search through the DHS-FEMA's Map Service Center for available data. Map Search allows requesters to search for data available for an individually specified map area.Quick Order allows requesters to search and order available data by specific FIRM panel or Community number.Payment must be in the form of a credit card.Visa, �� MasterCard,Discover and American Express,are accepted.Requesters without Internet access should contact the DHS-FEMA Map Information eXchange by calling 1-877-336-2627.They may fax their map order requests to the MSC at 1-800-358-9620. Requesters should note that for multiple property(structure or lot)requests,this form should only be completed � once to describe the entire project,One form for each lot is not necessary. Specific Instructions � Basis of Request � Select the type of MT-1 Letter of Map Change(LOMC)being requested,by checking only one box. Next to each type of LOMC a brief definition has been provided to assist the requester in making an informed selection. Fiil Placement � Fill is defined as material from any source(including the subject property)placed that raises the ground (natural grade)to or above the Base(1%-annual-chance) Flood Elevation (BFE).The common construction practice of � removing unsuitable existing material (topsoil)and backfilling with select structural material is not considered the placement of fill if the practice does not alter the existing(natural grade)elevation,which is at or above the BFE. Fill that is placed before the date of the first National Flood Insurance Program(NFIP�map showing the area in a � Special Flood Hazard Area is eonsidered natural grade.The Special Flood Hazard Area(SFHA)is the area that would be inundated by the base flood.Assistance to ascertain if fill has been placed on your property may be Instructions MT-1 Forms (086-0-26,086-0-26A,086-0-26B) FEB 11 2 � available from the community official or agency responsible for floodplain management.You may consult with the � community map repository to obtain previous editions of the NFIP map,archived topographic data,or permit drawings related to construction on the site. If the structure footprint is located on ground higher than the surrounding area,fill may have been placed.Additional sources for assistance would include the developer or �' engineer/designer of the subdivision, previous owners of the site, persons who have owned or resided on adjacent parcels,and large scale aerial photographs(check the tax assessor's office). In addition,digital copies of historic NFIP maps may be available on DHS-FEMA's Map Service Center(MSC),for a nominal fee.To place orders from the � MSC, interested parties may visit the MSC website at http://www.msc.fema.gov.. For additional information regarding historic maps, interested parties may contact the DHS-FEMA Map Information eXchange toll free,at 1- 877-FEMA MAP(1-877-336-2627). Regardless of the type of LOMC being requested, DHS-FEMA must require the requester to clearly state,to the � best of his or her knowledge,whether fill was or was not placed on his or her property,The requester must select either"yes"or"no." If fill was placed on the property,the requester must provide the month and year fill was placed. � In addition,for proposed projects, DHS-FEMA requires the requester to clearly state whether fill will be placed on �,.. his or her property. If fill will be placed,the requester must provide the month and year fill will be placed. In addition,the applicant must then provide documentation to show that ESA compliance has been achieved. Additional information about these requirements is available on Page 4 of this instruction packet. Number 1-Street Address r. Enter the street address(911 type)for the structure or property being reviewed (subject property). For requests involving multiple lots,structures,or units,attach a separate piece of paper including all street addresses when � space is insufficient. Number 2-Legal Description �. Describe the property by referring to the Deed or Plat Map.The description may consist of a lot number and � subdivision name,a parcel number,a tract number,or any other information provided in the Deed or Plat to identify the property(e.g. Lot 2, Block 1, Floodville Estates). It is not necessary to reproduce a lengthy description of the property as it appears in the Deed. � Number 3-Subject of Determination DHS-FEMA makes determinations on parcels of land or structures.The requester should select structure, portion � of a parcel,or a parcel of land. If the request is for a structure on a property,the date of construction must be provided in this section. Date of construction information may usually be obtained from real estate settlement documents,the property developer,or the local government office where real estate and/or land development transactions are recorded. If there is more than one structure on a property,attach a separate piece of paper with � the dates of construction. If the request is for a portion of a parcel,a certified metes and bounds description and map of the area to be removed,certified by a licensed land surveyor or registered professional engineer,are required.The metes and bounds description must cover the specific area Xo be removed,and it must be tied to an � identifiable starting point. If the description is for a legally recorded lot or parcel,the metes and bounds description should commence or begin at the lot or parcel corner. Metes and bounds descriptions must not intersect or coincide with the footprint of an existing structure. Please see the example below for the preferred � format of inetes and bounds descriptions. BEGINNING at the northeast lot corner;thence S16°42'22"E, 100.00 feet;thence S33°14'40"W, 145.92 feet;thence S89°13'29"W, 156.01 feet;thence N16°42'22"W,223.14 feet;thence 210.49 � feet along a curve to the left having a radius of 542.00 feet to the POINT OF BEGINNING � DHS-FEMA encourages the submission of inetes and bounds descriptions in digital format on CD.This may help expedite the processing of your request. Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 3 � Number 4- Number of Structures or Properties �� DHS-FEMA makes determinations on single or multiple, lots(parcels of land)or structures.Select the choice that best describes your request. �, Required Data t� All requests must include the following data: • Property description documentation must be enclosed for every request and will consist of either the Plat Map or Deed(containing the recorder's stamp and recordation date)accompanied by a tax assessor's map or other suitable map showing the surveyed location of the property.The recordation data (e.g., Book,Volume, i"' Page,Reel, Document Number,and Date)must be evident on the copies of these documents so that DHS- FEMA may use the legal description of the property. In addition, DHS-FEMA must be able to identify the � property exactly. If the property is not recorded on a Plat Map,a copy of a tax assessor's map or other suitable map must be submitted to aid DHS-FEMA in locating the property.The map should include at least one street intersection that is shown on the FIRM panel. � • A photocopy of the effective FIRM panel,annotated to show where the property is located, must be submitted for every request. If your community has a separate Flood Boundary and Floodway Map(FBFM), please include a copy.The panel number and effective date of the FIRM must appear on the copy submitted. � The actual map or a photographic copy must be used. • The Elevation Form(Form 2) must be included for all requests,except requests for determinations in which the FIRM already shows the property to be CLEARLY outside the SFHA. For cases in which the determination � for the property or structure is uncertain,elevation data must be submitted to provide a definitive determina- tion.This form must be completed by a licensed land surveyor or registered professional engineer. If an NFIP Elevation Certificate has been completed for a structure,it may be submitted in lieu of this form.The � Elevation Certificate must be certified by a licensed land surveyor or registered professional engineer. • The Community Acknowledgment Form(Form 3) must be included for all LOMR-F or CLOMR-F,or for LOMA requests in which the property has been inadvertently included within the NFIP regulatory floodway. For LOMR-F and CLOMR-F requests only Section A needs to be completed. For LOMA requests in which the I � property has been inadvertently included within the re ulator floodwa ,onl Section B needs to be b Y Y Y completed (see INSTRUCTIONS FOR COMPLETING OPTIONAL FORMS of these instructions for additional � information on the certification requirements of this form). • Documented ESA compliance must be submitted for CLOMR-Fs only.Appropriate documentation includes a copy of an Incidental Take Permit,an Incidental Take Statement,a"not likely to adversely affect" � determination from NMFS or USFWS,or an official letter from NMFS or USFWS concurring that the project has "No Effect"on proposed or listed species or designated critical habitat.Additional information about these requirements is available on Page 4 of this instruction packet. � Review and Processing Fee �"" The appropriate review and processing fee must be submitted for requests involving proposed projects and for requests involving the placement of fill (e.g.,CLOMA, LOMR-F,or CLOMR-F).The Payment Information Form should be included with the processing fee. No fee is required to obtain a determination based on existing conditions(i.e. LOMA)as long as no fill has been placed. For the current fee schedule visits DHS-FEMA's Flood Map-Related Fees Internet site: http://www.fema.gov/plan/prevent/fhm/frm fees.shtm. Wr� Signature �,,, The requester must provide his or her name, mailing address,and telephone number.The requester must also sign and date,where indicated,to certify the accuracy of the information provided.A Licensed Land Surveyor, � Registered Professional Engineer,or other designated agent may sign this form for the requester if they are submitting on their behalf. Providing an email address is optional, however, providing one will make it easier for DHS-FEMA to contact you if necessary and may facilitate the processing of your request. Instructions MT-1 Forms[086-0-26,086-0-26A,086-0-26B) FEB 11 4 � INSTRUCTIONS FOR COMPLETING THE ELEVATION FORM (FORM 2) � General Instructions � The Elevation Form (Form 2) must be completed by a licensed land surveyor or registered professional engineer (authorized by law to certify the information requested). If the request is to make a determination on the structure, and an NFIP Elevation Certificate has already been completed for this property, it may be submitted in lieu of this r� form. If the request is to make a determination on the entire legally recorded property,or a portion thereof,the lowest lot elevation must be provided on Form 2. If the request is to have the SFHA designation determined for the entire legally recorded property, but the only elevation provided is the Lowest Adjacent Grade to Structure,the determination will be issued for the structure. � For a licensed land surveyor or registered professional engineer to complete this form, it will be necessary to obtain the effective Flood Insurance Rate Map(FIRM) panel,effective Flood Boundary and Floodway Map(FBFM) panel (if � printed),and Flood Insurance Study(FIS) report that cover the area in which the property is located.These can be obtained from the community map repository or ordered from the Map Service Center(MSC),for a nominal fee.To place orders from the MSC,go to their Internet site: http://www.msc.fema.gov. � The DHS-FEMA Map Service Center allows users, including homeowners,surveyors,and engineers,to search the MSC for maps and other technical data.Searches can be conducted under the three following criteria:Catalog, Map Search,and Quick Order.Catalog allows surveyors and engineers to search through the Map Service Center for available data. Map Search allows surveyors and engineers to search for data available for an individually i'° specified map area.Quick Order allows surveyors and engineers to search available data by a specific FIRM panel or Community numbero All search criteria will allow surveyors and engineers to search desired data and add that data to a"shopping cart"for later payment options. Payment must be in the form of a credit card.Visa, MasterCard, Discover and American Express are accepted. � Surveyors and engineers that do not have Internet access should contact the DHS-FEMA Map Information eXchange by calling 1-877-FEMA MAP(1-877-336-2627).They may fax their map order requests to the MSC at 1- 800-358-9620. Number 1-Community Number I � Provide the six digit NFIP community number as it appears in the Title Block of the FIRM panel. In addition, include � the name of the property(i.e. legal description)and/or the property's address. �owr nnoo m�a no�e�r �moiw n000�e.eocun � FIRM FIRM F1A00 INSURANCE RRE MM Ft00D INSURAIILE RQE IW mwrcov FIAOD COUNTY, FIAODVILLE �pp�mU�t�(1�111Q USA AND � ��«w�+�'.�'U INCORPORATED AREAS ►aa�ax r�sbaw � �y...n,..a....,.w,.�M. �.�..�..�.,,b...«,. Caamudty Number �, mre�n.nie�a r�►rwa Ma�M PanN or M�p wawa��ot ereetn[eat Number e�nEwwe i�i �i�,iw �� easritiiu� � u� � Pdenl 0°'�me7 Y�id��1 �� . FMrnl Fiw�nc]M�^is��M�f ' � Flguro 1. Sample FiRM Panel Figufe 2. Sampie FIRM Pane1 � (Single Community) (Countywide) Instructions MT-1 Forms (086-0-26,086-0-26A,086-0-26B) FEB 11 5 � For additional information on reading FIRM panels you may consult the tutorial "How to Read a FIRM"on DHS- � FEMA's Internet site: http://www.fema.gov/media/fhm/firm/ot firm.htm. *Please note that, in some communities,the only NFIP maps available may be Flood Hazard Boundary Maps, � instead of FIRMs. Number 2-Conditionals � Identify whether the elevations being provided are based on existing or proposed conditions. Number 3-Type of Construction � If the request involves or will involve a structure, provide the type of construction. Crawl Space—The bottom floor is below the first floor,is enclosed by solid and partial perimeter walls, and may be above ground level (grade)on one or more sides.Spaces below ground level on all sides must �, meet the requirements of FEMA Technical Bulletin 11-01.Spaces with a bottom floor elevation more than 2.0 feet below the Lowest Adjacent Exterior Grade(LAG)elevation will be classified as a basement. � Slab on Grade—The bottom floor is at or above ground level (grade)on at least one side. easement/Enclosure—The bottom floor(basement or underground garage) is below ground level (grade) � on all sides.See Crawl Space above. Other—All other structure types not listed above including, but not limited to split levels,structures on piers, mobile homes,etc. Please be as detailed as possible. � Number 4-Elevation Datum Provide the elevation datum (e.g., NGVD 29, NAVD 88,or other specified)for which the property elevations shown � on the form are referenced. If the datum being referenced is different than the datum used to produce the effective FIS, please provide the datum conversion. Please note that mean sea level datum(MSL) is used within the Commonwealth of Puerto Rico and local tidal datum(LTD) is used within the U.S.Virgin Islands. �, Number 5-Geographic Coordinate Data � The surveyor or engineer must provide the latitude and longitude of the property in decimal degrees to the 5th decimal place(00.00000), and indicate the appropriate horizontal datum,WGS84, NAD83,or NAD27. Number 6-Subsidence or Uplift � Land subsidence is the lowering of the ground as a result of water,oil,gas extraction,as well as other phenomena such as soil compaction,decomposition of organic material,and tectonic movement. Periodically,the National �^ Geodetic Survey re-levels some benchmarks to determine new elevations above the National Geodetic Vertical �� Datum of 1929(NGVD 29)or above the North American Vertical Datum of 1988(NAVD 88); however, not all benchmarks are re-leveled each time. � Check"yes" if the area of the property is in an area of subsidence or uplift, and provide the date of the current re- leveling;check"no"if the area of the property is not in an area of subsidence or uplift. In areas experiencing ground subsidence(e.g., Harris County,Texas,and Incorporated Areas);the most recently adjusted Elevation Reference Mark(ERM) must be used for accurate ground and structure elevations. Please consult the effective 1r„ Flood Insurance Study(FIS)for your community or local floodplain administrator for the most current ERM data. p� In general,the effects of subsidence can be accounted for by determining grade and structure elevations using �� benchmark elevations with the same re-level date as the benchmarks used to develop the Base(1%-annual- chance) Flood Elevations(BFEs)on the FIRM. Please be aware that benchmark re-level dates can be different for � different flooding sources. No adjustment is necessary to the BFEs on the FIRM. � Instructions MT-1 Forms (086-0-26,086-0-26A,086-0-26B) FEB 11 6 � � Elevation Table A row in the elevation table must be completed for each property(parcels of land or structures)involved in this � request(subject property). Address—Provide the street address(911 type)for subject property. � Lot/Block Number—Provide the property's lot and/or block number if available. In the absence of a lot or block number,the registered professional engineer or licensed land surveyor must include an identifier that clearly states for what the elevations are being referenced (e.g.residential structure,commercial building, unit 1,etc.). � Lowest Lot Elevation—For requests involving property,or a portion thereof, provide the lowest lot elevation to the nearest tenth(0.1)of a foot or meter. If the FIRM shows BFEs in meters,the accuracy of the lowest lot � elevation must be to the nearest tenth of a meter. If the BFE varies across the property, please provide a certified site plan showing the range of elevations across the property. LowestAdjacent Grade(LAGJ to the Structure—For requests involving a structure, provide the LAG elevation � (the elevation of the lowest ground touching the structure including attached patios,stairs,deck supports or garages),to the nearest tenth (0.1)of a foot or meter. If the FIRM shows BFEs in meters,the accuracy of the LAG elevation must be to the nearest tenth of a meter. � Base Flood Elevation—Provide the BFE affecting the property. FEMA will verify the BFE during the review process. BFEs can be obtained by locating the property on the effective FIRM for the community in which the property is located. Upon locating the property on the FIRM,the engineer or surveyor should determine the � type of flooding and in which flood zone the property is located.The summary below will provide direction for how to determine the BFE as a result of the flooding type and flood zone determination. � Base Flood Elevation Source—Provide the source used in determining the BFE(e.g. FIRM, profile,floodway data table,Community Determined,or other source).When submitting a BFE that is either community determined or from an alternate source, please include in the request,sufficient data that supports the BFE. �� • Riverine Flooding Systems(Zones AE or A1-A30)—Consult the FIS report for the community in which the property is located. Next, locate the flood profile for the flooding source by name. Estimate the property's location along the flood profile and interpolate the BFE using the 100-yr.flood profile line, � • Lacustrine(Stillwater)Flooding Systems—Consult the FIS report for the community in which the property is located. Next, locate the Summary of Stillwater Elevations table. Locate the flooding source, by name, and use the BFE listed in the table.The flooding source's BFE is normally shown to the nearest one-tenth � of a foot. If the flooding source is not listed in the"Summary of Stillwater Elevations"table, use the BFE as shown on the FIRM. � • Coastal Flooding Systems(Zones AE or A1-A30 and VE or V1-V30)—First,obtain the BFE from the FIRM panel. Next,consult the FIS report for the community in which the property is located. Locate the Summary of Stillwater Elevations table in the FIS report. Identify the flooding source, by name, and use '� the BFE listed in the table.Compare the BFE listed in this table to the BFE obtained from the FIRM. If the stillwater elevation listed in this table is less than or equal to the whole-foot BFE shown on the map minus 0.5 foot,a wave height,wave runup,and/or wave setup component exists. In this case,the whole-foot BFE shown on the map should be used for rating,construction,and floodplain management purposes. If � the stillwater elevation listed in the"Summary of Stillwater Elevations"table is greater than the whole- foot BFE shown on the map minus 0.4 foot,the stillwater elevation shown in the table shall be used as the � BFE.(Any property/structure located seaward of the landward toe of the primary frontal dune may not be removed from a Zone VE or Vi-V30). • Zone A Flooding—If the property is located in a Zone A,an area of approximate flooding with no BFEs � determined,a BFE will need to be determined by the engineer or surveyor. First,the engineer or surveyor should determine if a Federal,State,or local government agency has developed a BFE.Such agencies include the U.S.Army Corps of Engineers,the U.S.Geological Survey,the State's Department of Natural Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 7 � Resources, Department of Environmental Quality,or Department of Transportation;or the local Planning � and Zoning Department. If one has been developed,all supporting data and calculations used to develop the BFE must be submitted,or a letter directly from the government agency must be submitted. If a BFE has not previously been developed,the engineer or surveyor should consult DHS-FEMA 265,Managing Floodplain Development in Approximate Zone A Areas:A Guide for Obtaining and Developing Base(100- � yearJ Flood Elevations, available online at http://www.fema.�ov/library/viewRecord.do?id=2215.This publication is an excellent resource,which details the appropriate methods for determining BFEs in SFHAs � designated flood zone A.To obtain additional information about developing BFEs,contact the DHS-FEMA Map Information eXchange at 1-877-FEMA MAP(1-877-336-2627). If the property is greater than 50 lots or 5 acres,whichever is the lesser,the engineer or surveyor must determine a BFE as a provision of Part 60.3(b)(3),which is available online at http://www.access.gpo.gov/nara/cfr/waisidx 03/44cfr60 03.html. � • Shallow Flooding(Zone AH)—If the property is located in flood zone AH, locate the Summary of Stillwater Elevations table in the FIS report. Identify the flooding source, by name, and use the BFE listed in the � table. If no Summary of Stillwater Elevations table exists, use the BFE shown on the FIRM If different elevations appear within the same SFHA,the BFE is obtained by linear interpolation between two adjacent BFE lines. �• • Shallow/Sheet Flooding(Zone AO)—For a property located in Zone AO,the characteristics of the Zone AO area shown on the NFIP map will determine the appropriate methodology to be used to develop the BFE for the property. If the flooding is conveyed by the street, provide the highest top of curb or crown of street elevation(whichever is higher)along the property line and add this to the depth of flooding.The � lowest adjacent grade elevation must be above the curb or street elevation by an amount equal to or greater than the depth of flooding shown on the NFIP map. If the entire property is inundated by the SFHA and the flow is not conveyed by the street,add the depth of flooding to the average surrounding grade. If the property is partially inundated by the SFHA and the street does not convey the flow,add the depth of flooding to the lowest lot elevation.Along with the information required for one of the above- � mentioned methods, provide sufficient certified topographic information,including flow paths,to show that the structure is located on high ground relative to the depth indicated on the NFIP map. � If the request involves multiple properties(parcels of land or structures),elevations must be provided for each property. If the number of properties for which DHS-FEMA is to make a determination exceeds the number of rows on the Elevation Table,additional photocopies of the table may be attached to the back of the Elevation Form. � Certification (by a licensed land surveyor, registered professional engineer, or architect) The certifier must provide his or her name, license number and expiration date, his or her company name, telephone number and, if applicable, his or her fax number and email address.The certifier's seal, if available, may � be provided here.The certifier must sign and date the Elevation Form,where indicated,to certify the accuracy of the information provided. Not all states authorize architects and engineers to certify elevation information. Consult the state board of registration for more information. �. � � � r � "' Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 8 � INSTRUCTIONS FOR COMPLETING OPTIONAL FORMS � General � While Forms 1 and 2 must be completed for all requests, Form 3 must only be completed when applicable. Instructions for completing this form are provided below. � Community Acknowledgment Form (Form 3) The Community Acknowledgment Form(Form 3) must be completed for all requests involving the placement of fill, existing or proposed,or requests for land or structures that are inadvertently included in the NFIP regulatory �"' floodway.The form must be completed and signed by the community official responsible for floodplain management in the community.The community name and the subject property address shown in Items 1 and 2 of � the Property Information Form must appear in the spaces provided.Space has been provided within each section for the community official to provide comments on the project(e.g.Section A-The project is reasonably safe from flooding and satisfies Parts 60.3 and 65.5 of the NFIP regulations.Section B-Removal of the project from the �"' regulatory floodway will not result in an increase in Base Flood Elevations.). If additional space is required by the community official to provide the community's comments on a project,additional sheets may be attached to the back of this form. � Section A-Requests Involving the Placement of Fill � Instructions for Communities: As a participant in the NFIP under 44 CFR 60.3(a)(2),you are required to ensure, prior to issuing a floodplain development permit,that an applicant is in compliance with local and NFIP regulations and has obtained all necessary Federal and State permits related to development. For CLOMR-F requests,applicants must document ESA compliance to FEMA prior to issuance of the CLOMR-F determination. For LOMR-F requests, ESA compliance is required independently of FEMA's processo The community must ensure that appropriate ESA permits are � obtained per requirement under Section 60.3(a)(2)of FEMA's regulations.Additional information about these requirements is available on Page 4 of this instruction packet.Another common Federal permit requirement may include wetland permits under Section 404 of the Clean Water Act of 1972. If you need a wetlands permit or are � not sure if one is required,contact your local U.S.Army Corps of Engineers District Office. Necessary State permits vary depending on the State. Instructions for Applicants: �, You are responsible for obtaining all necessary Federal,State,and local permits as a condition of obtaining a LOMR-F or CLOMR-F.Your community is required to verify that you have obtained these necessary permits prior to � issuing a floodplain development permit or signing the Community Acknowledgment Form (MT-1 Form 3). In addition,for CLOMR-F requests,you must document to FEMA that ESA compliance has been achieved prior to issuance of the CLOMR-F determination. For LOMR-F requests, ESA compliance is required independently of �,,., FEMA's process.Your community must ensure that appropriate ESA permits are obtained per requirement under Section 60.3(a)(2)of FEMA's regulations.Additional information about these requirements is available on Page 4of this instruction packet.Another common Federal permit requirement may include wetland permits under Section 404 of the Clean Water Act of 1972. If you need a wetlands permit or are not sure if one is required,contact your local U.S.Army Corps of Engineers District Office. Necessary State permits vary depending on the State. � To assist communities in determining if a property or structure,existing or proposed, is reasonably safe from � flooding, DHS-FEMA has published Technical Bulletin 10-01.This bulletin outlines safe building practices,which when followed, may reduce the risk of flood damage to a property or structure. Community Officials interested in obtaining copies of this bulletin should visit our Internet site at http://www.fema.gov/pdf/fima/tb1001.pdf. � Community Officials that do not have Internet access should contact the FMIX toll free at 1-877-FEMA MAP(1-877- 336-2627). Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B) FEB 11 9 � All inquires regarding these,or other NFIP regulations,should contact the FMIX for assistance. � Section B—Property Located within the Regulatory Floodway � Required for all requests that are inadvertently included in the regulatory floodway.The regulatory floodway is the area of the Special Flood Hazard Area that must remain unobstructed in order to prevent unacceptable increases in Base Flood Elevations.This form must be signed by a community official, responsible for floodplain � management,to acknowledge the community's acceptance of a revision to the regulatory floodway within the community. � � ' r � � � � � � � r � i � Instructions MT-1 Forms(086-0-26,086-0-26A,086-0-26B)FEB 11 10 � . 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