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20140269 Preliminary Stormwater Site Plan 10202014 HATTO N {itJDAT PANTI ER - r,- ------ -� � � l i i � � i i ; i i j ( i I � � i � _ I � �... . .. . ... . ....._...__. .. . _... . . . . .,. _ ` � , � � � �� ;��\ _., � � ENGINEERS AND SURVEYORS _ I - - ' ' ' ' � FOOD DISTRIBUTION WAREHOUSE Preliminary �� STORMWATER SITE PLAN � Prepared for: Yelm Prairie Christian Church 501 103rd Avenue NE � Yelm, WA, 98597 (360)458-7564 �° October 20, 2014 � � Prepared by: David W Spiller, PE � Reviewed by Steven D. Hatton PE � � HATTON GODAT PANTIER 3910 Martin Way E, Suite B �. Olympia, WA 98506 (360) 943-1599 � � Project No: 13-100 Project Name: FOOD DISTRIBUTION WAREHOUSE E:lofficelJOBS12 01 311 3-1 0 0 Yelm Prairie Christian CenterlRPT-Stormwater Site Plan-FOOD DISTRIBUTION WAREHOUSE-10.20.14.doc � ' r � . 1 � I hereby certify that this Preliminary Stormwater Site Plan for FOOD DISTRIBUTION WAREHOUSE, 909 RHOTON ROAD NW,Yelm, Washington, has been prepared by me or under my direct supervision and meets minimum standards of THE CITY OF YELM and normal r� standards of engineering practice. I hereby acknowledge and agree that THE CITY OF YELM does not and will not assume liability for the sufficiency, suitability or performance of drainage � facilities designed by me. � ' � ' ' �°""� / � ��::°�.,�-- ..- � - �� 'g tu � � � �� D' .�9 � � a¢wASXr l'l+ - ti�'�.�' �"G O / �� (C t� � � a � Date � ''�� `d ��' � � 24193 � ,� O�'�'�sj GISTER�G �NAL� � Seal � � FOOD DISTRIBUTION WAREHOUSE 10.20.14 PAGE 2 � , ' 1 . �r TABLE OF CONTENTS � I. FACILITY SUMMARY FORM...............................................................................4 II. PROJECT OVERVIEW AND MAPS..................................................................... 9 � 111. EXISTWG CONDITIONS SUMMARY................................................................ 10 � IV. OFFSITE ANALYSIS REPORT.......................................................................... 14 V. SUMMARY OF MINIMUM REQUIREMENTS..................................................... 15 �' VI. PERMANENT STORMWATER CONTROL PLAN � ............................................. 17 VII. FLOW CONTROL SYSTEM............................................................................... 19 � Vill. WATER QUALITI(SYSTEM .............................................................................. 19 IX. SPECIAL REPORTS AND STUDIES................................................................. 22 �" X. OTHER PERMITS .......................... 22 .................................................................... XI. CONSTRUCTION STORMWATER POLULUTION PREVENTION PLAN � (C-SWPPP) ................................................................................................................... 23 Section 1 Mark Clearing Limits...........................................................................23 � Section 2 Establish Construction Access...........................................................23 Section 3 Control Flow Rates.............................................................................23 Section 4 Install Sediment Controls....................................................................23 Section 5 Stabilize Soils.....................................................................................24 � Section 6 Protect Slopes....................................................................................24 Section 7 Protect Drain Inlets.............................................................................25 Section 8 Stabilize Channels and Outlets..........................................................25 � Section 9 Control Pollutants...............................................................................25 Section 10 Control De-Watering...........................................................................26 Section 11 Maintain BMPs....................................................................................26 � Section 12 Manage the Project............................................................................26 XII. STORMWATER MAINTENANCE PLAN ...............................................29 Attachment A Stormwater Facilities Maintenance Program...............................31 � Attachment B Pollution Source Control Program ...............................................47 XIII. APPENDICES Appendix A Special Reports and Studies......................................................A-1 Appendix B Drainage Maps...........................................................................B-1 Appendix C Drainage Calculations......................................................C-1 � FOOD DISTRIBUTION WAREHOUSE 10.20.14 PAGE 3 �� ' ' ' � I. THURSTON REGIONAL FACILITY SUMMARY FORM Complete one for each facility (e.g., detention/retention, coalescing plate filter) on the project site. Attach 8 '/z" by 11" sketch showing location of facility. ,,,+ Proponent's facility name or identifier(e.g., Pond A): North and South Infiltration Ponds � Name of road or street to access facility: Rhoton Road NW Hearings Examiner case number: � Development Review Project No./Bldg. Permit No.: Parcel Number(s): 64303601802 � To Be Completed By Utility Staff: � Utility facility number .............................................. Parcel number status, (num, 1ch) .......................... � 0-Known; 1-Public; 2-Unknown; 3-Unassigned Basin and sub-basin, (num, 6ch) ........................... 2ch-Basin; 2ch-Sub-basin; 2ch-Future Responsiblejurisdiction, (alpha, 1ch) ..................... rr O-Olympia; C-County; T-Tumwater; L-Lacey � Part 1 — Project Name and Proponent Project name: Food Distribution Warehouse � Project owner: Yelm Prairie Christian Church Project contact: Pastor Brad Carlson � Address: 501 103rd Avenue NE Yelm,WA 98579 � Phone: (360)458-7564 Project proponent (if different): Same Address: � � Phone: Project engineer: Steven D. Hatton, PE � Firm: HATTON GODAT PANTIER Phone number: (360) 943-1599 *� FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 4 i ' ' 1 � Part 2 — Project Location Section 19 � Township 17N Range 2E � Names and addresses of adjacent property owners: � Downs Gloria 1016 Kings View CT NE Yelm, WA 98597 Lucas Ruth E 1017 Kings View CT NE Yelm, WA 98597 � Lancaster Homeowners Assn 2836 Hidden Springs Loop SE Olympia, WA 98513 C & N Leasing Inc PO Box 1152 Bellingham, WA 98227 � Padgett Vern L 2705 Pacific Avenue Tacoma, WA 98402 City of Yelm 105 Yelm Avenue W Yelm, WA 98597 Washington Federal Savings 425 Pike Street FL 3 Seattle WA 98101 � Arnold Richard J & Maria C 912 NW Crystal Springs Road Yelm, WA 98597 Hatala Heather N 814 Mountain Aire Ct NW Yelm, WA 98597 �1 Part 3 — Type of Permit Application � Type of permit (e.g., commercial building): Commercial Building Other permits (�): � ❑ DOF NV HPA ❑ COE 404 ❑ COE Wetlands ❑ DOE Dam Safety ❑ FEMA ❑ Floodplain � ❑ Shoreline Management ❑ Rockery/Retaining Wall ❑ Encroachment � Grading � ❑ Other �,,, Other agencies (e.g., federal, state, local) that have reviewed or will review this Drainage and Erosion Control Plan: NONE � � � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 5 � , � Part 4 — Proposed Project Description � What stream basin is the project in (e.g., Percival, Woodland)? Yelm Creek Zoning: ........................ I - Industrial � Onsite Residential Subdivision: � Number of lots........................................... Average lot size (acres) ............................ „� Building Permit/Commercial Plat: Building(s) (footprint, acres)...................... 0.61 Concrete paving (acres)............................ 1.47 � Gravel surface (acres)............................... Pervious paving (acres) ............................ � Public roads-including gravel shoulder(acres)...... Private roads-including gravel shoulder(acres)..... .� Onsite impervious surface total (acres).................. Part 5 — Pre-Developed Project Site Characteristics � Stream through site (Y/N) N � Name DNR Type � Type of feature this facility discharges to (e.g., lake, stream, intermittent stream, pothole, roadside ditch, sheet flow to adjacent property): Infiltration � Swales (Y/N)....................................................... N Steep slopes—steeper than 10% (Y/N).............. N � Erosion hazard (Y/N) .......................................... N 100-year floodplain (Y/N).................................... N � Wetlands (Y/N).................................................... N Seeps/springs (Y/N)............................................ N High groundwater table (Y/N)............................. N � Other ................................................................. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 6 � . � ' � � Part 6 — Facility Description - North Pond Total area tributary to facility including offsite(acres).................. 1.70 � Total onsite area tributary to facility (acres)................................. 1.70 �, Design impervious area tributary to facility(acres)...................... 1.40 Design landscaped area tributary to facility (acres)..................... 0.30 � Design total tributary area to facility (acres)................................. 1.70 Enter"1" for type of facility Wet pond detention....................................... 1 � Wet pond water surface area (acres) ........... 0.10 Dry pond detention........................................ � Underground detention ................................. Infiltration pond.............................................. � Drywell infiltration.......................................... Coalescing plate separator........................... Centrifuge separator...................................... Other .......................................................... �- Outlet type (enter"1"for each type present) � Filter .......................................................... Oil/water separator........................................ Single orifice.................................................. � Multiple orifices.............................................. Weir .......................................................... Spillway......:.................................................. 1 � Pump(s)......................................................... Other .......................................................... � Part 7 — Release to Groundwater �, Design percolation rate to groundwater(if applicable) 10 inches per hour � Part 8 — Release to Surface Water (if applicable) � Jurisdiction MSL percent Design Full Volume(Cfl Discharge To Surface Elevation(Ft) Water(Cfs) � � � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 7 , ' � Part 6 — Facitity Description — South Pond � Total area tributary to facility including offsite (acres).................. 1.00 Total onsite area tributary to facility (acres)................................. 1.00 Design impervious area tributary to facility (acres)...................... 0.90 � Design landscaped area tributary to facility (acres)..................... 0.10 � Design total tributary area to facility (acres)................................. 1.00 � Enter"1" for type of facility Wet pond detention....................................... 1 � Wet pond water surface area (acres) ........... Dry pond detention........................................ Underground detention ................................. Infiltration pond.............................................. � Drywell infiltration.......................................... � Coalescing plate separator........................... Centrifuge separator...................................... Other Porous Asphalt ................................ � Outlet type (enter"1"for each type present) � Filter .......................................................... «� Oil/water separator........................................ � Single orifice.................................................. Multiple orifices.............................................. � Weir .......................................................... Spillway......................................................... 1 Pump(s)......................................................... � Other ......................................................... Part 7 — Release to Groundwater � Design percolation rate to groundwater(if applicable) 10 inches per hour � Part 8 — Release to Surface Water (if applicable) Jurisdiction MSL Discharge To Surface � Elevation(Ft) Percent Design Full Volume(Cf) Water Cfs � ) 0 0.00 0.00 25 � 50 100 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 8 � t � � II: PROJECT OVERVIEW AND MAPS �, This project proposes to create a 26,408 SF warehouse with parking and loading area. The project is located within the City of Yelm, 909 Rhoton Road NW in Section 19, Township 17 North, Range 2 East, W.M. in Thurston County, Washington (see the Preliminary Site Plan in Appendix � B). Tax Parcel Number is 22719210900. The legal description is shown on the preliminary site plan. Z,oning is i - Industrial which allows the proposed use. The project parcel, as herein referred � to, will be reconfigured via a boundary line adjustment submitted concurrently with the site plan review. The parcel is currently a mix of developed and undeveloped land. The developed portion is located � in the southeast corner of the site and consists of concrete and other paved surfaces. The remainder of the site is undeveloped with a mix of ineadow and treed areas. Currently runoff from � the site sheet flows to the east. The proposed warehouse and paved areas will drain to two new infiltration ponds, no discharge from site. Runoff to both ponds will be treated in treatment wetland sized in accordance with the Drainage Manual. � The proposed warehouse and other impervious surfaces will cover 2.30 ac with 0.40 ac landscaping. The project will create more than 5,000 SF of new impervious area. The project must apply the drainage manual's minimum requirements 1 through 10 to the NEW/REPLACED �' IMPERVIOUS AND CONVERTED LANDSCAPE AREAS. � The existing vegetation in the proposed parking addition consists of ineadow with some trees. The site borders existing homes on the north and west. The site east of the site is previous developed �. as industrial buildings but do not appear to be in use at this time. The City of Yelm Public Works facility occupies the parcel to the south. � The site is adjacent to the Yelm Creek 100-year flood zone as identified by FEMA flood insurance maps. No other critical areas have been identified within the set backs of the site. No erosion or � drainage issues were visible during site visits. - Proposed drainage for the project consists of sheet flow to catch basins connected to the wetland treatment ponds. The wetland treatment ponds are wet ponds with a depth distribution to � encourage growth of wetland vegetation. The vegetation and wet pond configuration provide enhanced storm water treatment. The wetland treatment ponds discharge runoff to infiltration ponds located adjacent to the treatment ponds. The infiltration ponds meet the criteria for 100% � infiltration described in the drainage manual. , / ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 9 � � ' � III. EXISTING CONDITIONS SUMMARY � The site vegetation in the undeveloped portion of the site consists of ineadow and trees. The adjacent parcels are developed as commercial sites and single family homes. North and West of the site are single family homes. The parcels to the east of the site are unoccupied industrial '� facilities. The City of Yelm Public Works facilities are located to the south. The existing developed portions of the site are paved or old foundations. The site lies within the Yelm Creek Basin. The proposed warehouse and parking area lies between elevations 324 and 336. The area � generally slopes towards the east. Runoff from the site drains to the Rhoton Road ditch and adjacent low lying property. � The site is adjacent to the 100-year flood zone for Yelm Creek as identified by the FEMA Flood Maps. Small portions will be regarded in the AE-Zone of the 100 year fiood plain. No other critical � areas have been located adjacent to the project site. No erosion downstream of the site is anticipated. Utilities are available in the public streets and onsite including power, sewer, water, and gas. � A Soil Resource Report prepared by from the National Soil Survey Joint effort discusses the onsite soils characteristics (located in Appendix A). This report notes that onsite soils are mostly � Spanaway sandy gravel, conducive to typical infiltration facilities. ;;�r � � � ' ' ' ' ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 10 � ' ' ' ' � � ' � SITE � � 0 J � Y �O z Py � � ��q = RP��'� 9�9� � �o a �o � � � �y�, � o N.T.5. � C)Q�` � > 5�� 5R 103rd AVE J-F� Q 9� F. a o � SR 507 'y��y� VICINITY MAP s�o � , � 1 ' ' ' . 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' 8 � • �,�' � N � 4 ___ 46°5]3'N . # _ . _�, .:' ._ . .... .. �..__. . ._ . 46°571"N .. . ��,_,� �J-/J �.. �- -f:ll�;l 5302'�J �?(i32G 531350 530390 53(kll� 3 'v " Map Sole:1:1,280 if prir�d on A landa:ape(11"x 8.5")sheet '� �� ^� M�e.rs � � N p 15 30 60 90 A �` 0 50 100 200 300 Map pmjalion:Web Mier�F�famer mordr�s:WG584 Edgeti6:UiM Zone S�N N1684 � 8 ' � ' � � � ' � � • ' ' ' IV. OFFSITE ANALYSIS REPORT � The site currently receives runoff from ofFsite sources along the boundary. The north and west sides of the site are bounded by single family homes. These offsite areas are narrow and less � than 0.1 ac. A ridge line is located along the west boundary. Runoff from the site currently sheet flows to the adjacent parcels located east of the site. The proposed new stormwater systems include catch basins, treatment wetlands, and infiltration ponds. All runoff is anticipated to infiltrate and no discharge to the down stream is anticipated. No known conveyance system or localized flooding issues exist on or down stream of the site and the 'i proposed storm system is anticipated to improve those conditions by infiltrating the runoff. � TABLE IV WWHM DEVELOPED LAND USE SUMMARY TRIBUTARY DEVELOPED AREA NORTH SOUTH SITE(AC) � POND(AC) POND(AC) Total Acreage 1.70 1.00 2.70 Impervious Area 1.40 0.90 2.30 � Pond 0.22 0.15 0.37 � Pavement 0.51 0.75 1.26 Roof 0.61 0.00 0.61 Pervious Area 0.30 0.10 0.40 � Percent Impervious 82% 90% 85% � Based on W1NHM2012, the project will decrease the peak 100-year runoff by 0.11 cfs from a undeveloped conditions. No offsite drainage improvements required. � ' , ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 14 � ' � - � � � V. SUMMARY OF MINIMUM REQUIREMENTS p�' The drainage manual classifies this project as a new Development. The majority of the site is currently un-developed and only a small portion developed. Based on a review of the Flow Chart for Determining Requirements for New Development(figure 2.3 (b) from the City Drainage Manual) Minimum Requirements 1-10 apply to the project. ►� • The project has more than 5,000 SF of new impervious area. � • The project exceeds 50% of existing impervious area. • The project does exceed 25% of the assessed value of the site. Minimum Requirements 1 through 10 apply to the new impervious and converted landscape areas. � 6t�t Here 6 � �� ..__.... T__ - D025 tue=_ite harr � SeP RcdeSrzlapm�eut � ±�°o cr m�cxe oi Yes �.�� ' esistina uupen7cus ��F; Rec��iren��+ts and ,,. COi2Sas2� F�4i�i�.1�TL '. � ^ —' (FiQure 3.3) Nu : Does the pi'oject coaren � 31a acres Qrmare af Dces tlie pr�ject ; re.gefatioa to Iarc^n er � result in�_��00 �,�� ian�scayed m'eas,or :qnare feet.er No cos�4ert 2_5 aci�es or more ��eater.�fue:cpins ofs�ati��e�:egetarionio re}�lacedhard � pasftu-e? snr'a�e area' � _—__ i _—._ Bfles the grcject �� Yes Yes No resulS in 2,040 sc;uare feei,nr�eater,of neza�plus replazed All hfinituuui hard surface area? � R.equireiueuts applt* ( ta tl�z ae:�:wd W replaced hard surf3ce� � and cou��rted Yes � Na �, �•zg�taticit u�as_ '1 1•finimum Requirenarnts � Does the pro�ect ha L� � T1 t3irou�Ji T?apply to f laad disturUing the ue��an3sep]aced � acrici#ies of'�,OOD hard 3iu�faces an�the '. Yrs sqnare feel or greater" � land disturbed. , '; l�To 1 A•Sinimum �' Requu-emeu#x"? I Y ��lies_ Y � Figure 2.4.1–Flow Ghart for deiermining Requirements for New De�elopment FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 15 ' ' , ' ' , 1 ' ' ' ' , ' ' , ' ' t ' ' ' ' , I � TABLE 4.1 THRESHOLD DISCHARGE AREA (All areas measured in acres) � Total Non-Pollution Generating Impervious 0 98 Surface (NPGIS) Total Pollution Generating Impervious 1.32 Surface (PGIS) � Total Pollution Generating Pervious Surface 0.40 � (PGPS) Native Vegetation Converted to 0.00 Lawn/Landscape Total Effective Impervious Surface 2.30 �. Discharge Point East Property Line � TABLE 4.2 TREATMENT REQUIREMENTS BY THRESHOLD DISCHARGE AREA � <'/<Acres of >3/<Acres of <5,000 ft2 of >5,000 ftz of PGPS PGPS PGIS PGIS Treatment Facilities X X � On-site Stormwater BMPs X X X X TABLE 4.3 FLOW CONTROL REQUIREMENTS BY THRESHOLD DISCHARGE AREA � FLOW CONTROL ONSITE STORMWATER FACILITIES MANAGEMENT BMPS <3/acres conversion to lawn/landscape or X � <2.5 acres to pasture. >3/acres conversion to lawn/landscape or X X >2.5 acres to pasture. � < 10,000 ft2 of effective impervious area. X > 10,000 ft2 of effective impervious area. X X � > 0.1 cfs increase in the 100-year return X X frequency flow. � ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 16 � � ' ' ' VI. PERMANENT STORMWATER CONTROL PLAN � There are ten minimum requirements for stormwater management within the City of Yelm. The minimum requirements are: ,' 1. Preparation of Stormwater Site Plan 2. Construction Stormwater Pollution Prevention 3. Source Control of Poliution � 4. Preservation of Natural Drainage Systems and Outfalls 5. Onsite Stormwater Management � 6. Runoff Treatment 7. Flow Control 8. Wetlands Protection � 9. Basin/V1/atershed Planning 10. Operation and Maintenance � Minimum Requirements 1-10 apply to this project's new impervious and converted landscape areas. Addressing these ten requirements, it is anticipated that the proposed project will have little � or no adverse effects on the downstream and surrounding hydrology. Each of the minimum requirements is discussed below. Minimum Requirement#1: Preparation of Stormwater Site Plan ��, This Stormwater Site Plan is submitted as part of the project to meet this requirement. Minimum Requirement#2: Construction Stormwater Pollution Prevention � A Construction Stormwater Pollution Prevention Plan (C-SWPPP) is provided in Section XIII. The CSWPP addresses erosion and sediment control anticipated during construction. w Minimum Requirement#3: Source Control of Pollution The catch basins located in the new parking area will have"No Dumping"stenciled adjacent to the structure. Site management will receive a copy of the Pollution Source Control Program as found �rl in the Stormwater Maintenance Plan in Section X. Applicable information should be provided to building inhabitants. The Source Control Program describes Best Management Practices (BMPs) for household products, automotive maintenance, pesticides, fertilizers and remodeling. � Minimum Requirement#4: Preservation of Natural Drainage Systems and Outfalls "! The project will infiltrate all runoff from the site; a reduction of 0.11 cfs during the 100-year event. r � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 17 � t ' � Minimum Requirement#5: Onsite Stormwater Management, Including � � Easements and Setbacks The project will treat and infiltrate runoff from the site. The roof area will drain to the North Pond �'' for infiltration. The paved surfaces will drain to the wet pond for treatment prior to being infiltrated in the infiltration pond. Based on the soii type and relatively small size of the project, the project will have little or no effect on the natural hydrologic characteristics of the site. �, Minimum Requirement#6: Runoff Treatment For surfaces with greater than 5,000 square feet(0.11 acres) of pollution generating impervious � surface (PGIS) or greater than 0.75 acres of pollution generating pervious surfaces, treatment facilities and onsite stormwater BMPs are required if there is a surface discharge. The new and replaced pollution generating impervious area is greater than 0.11 acres; therefore, treatment is � required. In addition, all commercial sites must provide enhanced treatment for stormwater. The Enhanced Menu facility choices are intended to provide a higher rate of removal of dissolved metals than � Basic Treatment facilities. Treatment for the new and replaced impervious area will be provided by two wetland treatment ponds; a stormwater treatment wetland will provides enhanced treatment for the new parking � areas. Minimum Requirement#7: Flow Control � For sites with greater than 10,000 square feet(0.23 acres) of total effective impervious surfaces or convert 0.75 acres native vegetation to landscape or lawn or convert 2.5 acres of native vegetation � to pasture, flow control and land use management BMPs are required if there is a surface discharge. Any site that increases the 100-year flow rate by 0.1 cfs or more requires flow control and land use management BMPs. This project s new and replaced impervious surfaces exceed � these thresholds and flow control is required. The project exceeds the conditions and must provide flow control. All runoff from the site will be infiltrated which exceeds the requirement. � Minimum Requirement#8: Wetlands Protection No wetlands have been located on or adjacent to the site. There are no offsite wetlands with in a � quarter mile downstream of the site. �,. Minimum Requirement#9: Basin/Watershed Planning � Yelm Creek is within the WRIA 11 Watershed and part of the Phase IV Nisqually Implementation Plan Area. The proposed stormwater system is in accordance with the Plan. � Minimum Requirement#10: Operation and Maintenance i� The Stormwater Maintenance Plan located in Section X, meets the requirement. The �* maintenance plan lists the maintenance steps necessary to keep the various stormwater �;�a components functioning. Checklists and observation log sheets are included in the plan. FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 18 � � ' • ' � VII. Flow Control System � TABLE 7.1 TRIBUTARY AREAS BY SUB BASINS ,� NORTH SOUTH TRIBUTARY DEVELOPED AREA POND(AC) POND SITE(AC) (AC) Total Acreage 1.70 1.00 2.70 r Impervious Area 1.40 0.90 2.30 � Pond 0.22 0.15 0.37 Pavement 0.51 0.75 1.26 Roof 0.61 0.00 0.61 � Pervious Area 0.30 0.10 0.40 Computer Modelinq � VWVHM was used to model the facility sizing based on the above areas. The site was modeled A/B forest for the pre-developed conditions for the each sub-basin. The developed conditions were � modeled as two-sub basins, the portion draining to the North and South. Both infiltration ponds are designed to infiltrate 100% of the runoff. Computer printouts and descriptions of the calculations are included in the appendix. � Infiltration Pond Sizinq The infiltration ponds were sized using Western Washington Hydrology Model (WWHM). The model uses the historical record of rainfall data to estimate water flows. The infiltration rate was set � at 10 inches and hour which is typical of Spanaway soils for preliminary sizing calculations. The base area was set to the same area as shown on the preliminary plans. The hydrology model showed the proposed pond base areas will infiltrate 100% of the runoff without over topping. See i°'� Appendix C for VW1/HM output. VIII. Water Quality System � STORMWATER WETLAND Treatment of on-site stormwater will occur in a treatment wetland pond. The pavement areas will � drain into a treatment wetland pond sized per the drainage manual, the roof will be tight-lined into the infiitration pond. This stormwater wetland design occupies about the same surface area as wet pond, but has the potentiai to be better integrated aesthetically into a site because of the abundance of emergent aquatic vegetation. The most critical factor for a successful design is the � provision of an adequate supply of water for most of the year. Sizinq Procedure Step 1: The volume of a basic wetpond is used as a template for treatment wetland. Using 1NWHM, equivalent output is the 91 st percentile, 24-hour runoff volume. � ', West 0.2951 ac ft � East 0.1351 ac ft FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 19 ' � � � � � � Step 2: Calculate the surface area of the stormwater wetland. The area of the wetland shall be the same as the top area of a wetpond the same site conditions. Calculate the surface area of the stormwater wetland by using the volume from Step 1 and dividing by the average � water depth (use 3 feet). West 0.2951*43560/3 =4,284 sf East 0.1351*43560/3 = 1,962 sf �` Step 3: Determine the surface area of the first cell of the stormwater wetland. Use the volume determined from Criterion 2 under"Wetland � Geometry", and the actual depth of the first cell. Surface Area of First Cell � West= (1/3 *0.2951 ac*ft*43560sf/ac)/4 ft = 1,071 SF East= (1/3 *0.1351 ac*ft*43560sf/ac)/4 ft=490 SF* *the required 4 foot depth plus one foot storage for a total depth of 5 feet with 3 to � 1 side slopes requires a larger area. 3*5 width of side slope; (15+15)^2 = 900 SF min. The first sell has been set with a depth that is reasonable for construction and maintenance. � Step 4: Determine the surface area of the wetland cell. Subtract the surface area of the first cell (Step 3) from the total surface area (Step 2). � West wet cell surface area = 4,284 sf- 1,071 sf= 3,213 SF � East wet cell surface area = 1,962 sf-490 sf = 1,472 SF Step 5: Determine water depth distnbution in the second cell. Decide the top of the dividing berm will be at the surface or submerged ?" (designer's choice). Adjust the distribution of water depths in the �, cell according to Criterion 8 under"Wetland Geometry" below. This will result in a facility that holds less volume than that determined �- Step 1 above. This is acceptable. i �' Use a submerged berm with constant slope to deeper portion of wet cell. !" Intent� The surface area of the stormwater wetland is set to be rouqhiv equivalent � to that of a wetpond desiqned for the same site so as not discouraqe use of this option. M � Step 6: Choose plants. See Table 10.1 for a list of plants recommended for wetpond water depth zones, or consult a wetland scientist. � � i� FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 20 � ' ' � Wetland Geometry Criteria 1. Stormwater wetlands shall consist of two cells, a presettling cell and a � wetland cell. 2. The presettling cell shall contain approximately 33 percent of the � wetpool volume calculated in Step 1 above. 3. The depth of the presettling cell shall be between 4 feet(minimum) and 8 feet(maximum), excluding sediment storage. 4. One-foot of sediment storage shall be provided in the presettling cell. � 5. The wetland cell shall have an average water depth of about 1.5 feet � (plus or minus 3 inches). 6. The "berm"separating the two cells shall be shaped such that its downstream side � gradually slopes to form the second shallow wetland cell (see the section view in Figure 10.7). Alternatively, the second cell may be graded naturalistically from the top of the dividing berm (see Wetland Geometry Criterion 8 below). 7. The top of berm shall be either at the WQ design water surface or � submerged 1-foot below the WQ design water surface, as with wetponds. Correspondingly, the side slopes of the berm must meet the � following criteria: a. If the top of berm is at the WQ design water surface, the berm side slopes shall be no steeper than 3H:1 V. � b. If the top of berm is submerged 1-foot, the upstream side slope may be up to 2H:1V. If the berm is at the water surface, then for � safety reasons, its slope should be not greater than 3:1,just as the pond banks should not be greater than 3:1 if the pond is not fenced. A steeper slope (2:1 rather than 3:1) is allowable if the berm is submerged in 1 foot of water. If submerged, the berm is not �' considered accessible, and the steeper slope is allowable. 8. Two examples are provided for grading the bottom of the wetland cell. One example is a shallow, evenly graded slope from the upstream to the downstream edge of the wetland cell (see Figure 10.7). The ''� second example is a "naturalistic" alternative, with the specified range of depths intermixed throughout the second cell (see Figure 10.8). A � distribution of depths shall be provided in the wetland cell depending on whether the dividing berm is at the water surface orsubmerged (see Table 10.2 below). The maximum depth is 2.5 feet in either � configuration. Other configurations within the wetland geometry constraints listed above may be approved by the Local Plan Approval Authority. � , , ' FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 21 � ' , I ' � � IX. Special Reports and Studies �, A Tree Report, Trip Generation and Critical Habitat Report has been prepared and submitted as part of the land use application. X. Other Permits r,,, Other permits beyond approval of this Stormwater Site Plan and Construction Stormwater Pollution Prevention Plan include building permits. � ' , ' � � ' t � � t ' � FOOD D�STRIBUTION WAREHOUSE 10.20.2014 PAGE 22 � �. ' , , XI. CONSTRUCTION STORMWATER POLULUTION PREVENTION PLAN (C-SWPPP) � �, Projects in which the new, repiaced, or new plus replaced impervious surfaces total 2,000 square feet or more, or disturb 7,000 square feet or more of land must prepare a Construction Stormwater Pollution Prevention Plan (C-SWPPP). The C-SWPPP is a separate document and must address each of the twelve elements unless site conditions render the element unnecessary and the exemption from the element is clearly justified in the narrative of the C-SWPPP. '� Section 1 Mark Clearing Limits � a. Prior to land disturbing activities, including clearing and grading, all clearing limits, sensitive areas and their buffers and trees that are to be preserved within the construction area shall +� be clearly marked, both in the field and on the plans, to prevent damage and offsite impacts. b. Plastic, metal or stake wire fence may be used to mark the clearing limits. � c. The duff layer, native topsoil and natural vegetation shall be retained in an undisturbed state to the maximum extent practicable. Section 2 Establish Construction Access � a. Construction vehicle access and exit shall be limited to one route, if possible. � b. Access points shall be stabilized with quarry spall or crushed rock to minimize the tracking of sediment onto public roads. c. Public roads shall be cleaned thoroughly as needed to protect stormwater infrastructure � and downstream water resources. Sediment shall be removed from roads by shoveling or pickup sweeping and shail be transported to a controlled sediment disposal area. Street ,� washing shall be allowed only after sediment is removed in this manner. d. Street wash wastewater shall be controlled by pumping back onsite, or otherwise be prevented from discharging untreated into systems tributary to state surface waters. � Section 3 Control Flow Rates a. Properties and waterways downstream from the site shall be protected from erosion due to � increases in the volume, velocity and peak flow rate of stormwater runoff from the project site. � b. Downstream analysis is necessary if changes in flows could impair or alter conveyance systems, streambanks, bed sediment or aquatic habitat. Section 4 Install Sediment Controls � a. Prior to leaving a construction site, or prior to discharge to an infiltration facility, stormwater runoff from disturbed areas shall pass through a sediment pond or other appropriate � sediment removal BMP. Runoff from fully stabilized areas may be discharged without a FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 23 � � ' � sediment removal BMP, but must meet the flow control performance standard of Element. � Full stabilization means concrete or asphalt paving; quarry spalls used as ditch lining; or the use of rolled erosion products, a bonded fiber matrix product, or vegetation cover in a manner that will fully prevent soil erosion. The local permitting authority should inspect and approve areas stabilized by means other than pavement or quarry spalls. � b. Sediment barriers or filters, dikes, and other BMPs intended to trap sediment onsite shall be constructed as one of the first steps in grading. These BMPs shall be functional before � other land disturbing activities take place. Section 5 Stabilize Soils a. Soils shall be stabilized as outlined below, where downstream water resources or �, stormwater infrastructure may be negatively affected by sediments (i.e., runoff discharges off the development site). � b. From October 15 through April 1, no soils shall remain exposed and unworked for more than 2 days. From April 2 through October 14, no soils shall remain exposed and unworked for more than 7 days. From November 1 through February 28 soil disturbing � activities shall be prohibited. No soil disturbing activities shall occur within Green Cove, Percival,Woodard, and Ellis Creek watersheds from October 15 through April 1. This condition applies to all onsite soils, whether at final grade or not. � c. Applicable practices include but are not limited to compost addition, temporary and permanent seeding, sodding, mulching, plastic covering, soil application of polyacrylamide (PAM), early application of gravel base on areas to be paved and dust control. � d. Soil stabilization measures selected should be appropriate for the time of year, site conditions, estimated duration of use and potential water quality impacts that stabilization � agents may have on downstream waters or groundwater. e. Soil stockpiles must be stabilized from erosion, protected with sediment-trapping measures, and located away from storm drains, waterways, or drainage channels. � f. Work on linear construction sites and activities, including right-of-way and easement clearing, roadway development, pipelines, and trenching for utilities, shall not exceed the capability of the individual contractor for his portion of the project to install the bedding � materials, roadbeds, structures, pipelines, and/or utilities, and to re-stabilize the disturbed soils, in compliance with the applicable 2-day or 7-day criterion listed above. � Section 6 Protect Slopes a. Cut and fill slopes shall be designed and constructed in a manner that will minimize �, erosion. �, b. Consider soil type and its potential for erosion. c. Reduce slope runoff velocities by reducing the continuous length of siope with terracing � and diversions, reduce slope steepness, and roughen slope surfaces. � d. Offsite stormwater run-on shall be diverted away from slopes and disturbed areas with � interceptor dikes and swales. Offsite stormwater should be managed separately from � stormwater water generated onsite. FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 24 n+ � ' ' � e. Stabilize soils on slopes, as specified in Element#5. Section 7 Protect Drain Inlets � a. As needed to protect stormwater infrastructure and downstream water resources, all storm � drain inlets made operable during construction shall be protected so that stormwater runoff shall not enter the conveyance system without first being filtered or treated to remove sediment. b. All approach roads shall be kept clean, and all sediment and street wash water shall not be allowed to enter storm drains without prior and adequate treatment, unless treatment is � provided before the storm drain discharges to waters of the state. Section 8 Stabilize Channels and Outlets � a. All temporary onsite conveyance channels shall be designed, constructed and stabilized to � prevent erosion from the peak 10-minute flow velocity from a Type 1A 10-year, 24-hour frequency storm for the developed condition. b. Stabilization, including armoring material, adequate to prevent erosion of outlets, adjacent � streambanks, slopes and downstream reaches shall be provided at the outlets of all conveyance systems. � Section 9 Control Pollutants a. 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. b. Cover, containment and protection from vandalism shall be provided for all chemicals, + liquid products, petroleum products and non-inert wastes present on the site (see Chapter 173-304 WAC for the definition of inert waste). Onsite fueling tanks shall include � secondary containment. c. Maintenance and repair of heavy equipment and vehicles involving oil changes, hydraulic *� system drain down, solvent and de-greasing cleaning operations, fuel tank drain down and removal, and other activities which may result in discharge or spillage of pollutants to the ground or into stormwater runoff must be conducted using spill prevention measures, such as drip pans. Contaminated surfaces shall be cleaned immediately following any � discharge or spill incident. Report all spills to 911. Emergency repairs may be performed onsite using temporary plastic placed beneath, and if raining, over the vehicle. d. Wheel wash or tire bath wastewater shall be discharged to a separate onsite treatment � system or to the sanitary sewer if allowed by the local wastewater authority. � e. Application of agricultural chemicals, including fertilizers and pesticides, shall be conducted in a manner and at application rates that will not result in loss of chemical to stormwater runoff. Manufacturers' label recommendations shall be followed for application rates and procedures. + , f. Management of pH-modifying sources shall prevent contamination of runoff and , stormwater collected on the site. These sources inciude, but are not limited to, bulk cement, cement kiln dust, fly ash, new concrete washing and curing waters, waste streams � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 25 ' � ' ' � generated from concrete grinding and sawing, exposed aggregate processes, and � � concrete pumping and mixer washout waters. Section 10 Control De-Watering ' � a. All foundation, vault, and trench de-watering water, which have similar characteristics to stormwater runoff at the site, shall be discharged into a controlled conveyance system, prior to discharge to a sediment trap or sediment pond. Channels must be stabilized, as specified in Element#8. ° •M b. Clean, non-turbid de-watering water, such as well-point groundwater, can be discharged to systems tributary to state surface waters, as specified in Element#8, provided the de- watering flow does not cause erosion or flooding of the receiving waters. These clean � waters should not be routed through sediment ponds with water. c. Highly turbid or otherwise contaminated de-watering water, such as from construction � equipment operation, clamshell digging, concrete tremie pour, or work inside a cofferdam, shall be handled separately from stormwater at the site. � d. Other disposal options, depending on site constraints, may include: 1. Infiltration � 2. Transport offsite in vehicle, such as a vacuum flush truck, for legal disposal in a manner that does not pollute state waters 3. Onsite treatment using chemical treatment or other suitable treatment technologies � 4. Sanitary sewer discharge with local sewer district approval Section 11 Maintain BMPs � a. All temporary and pe�manent erosion and sediment control BMPs shall be maintained and repaired as needed to assure continued performance of their intended function. All maintenance and repair shall be conducted in accordance with BMPs. �, b. Sediment control BMPs shall be inspected weekly or after a runoff-producing storm event during the dry season and daily during the wet season. � c. All temporary erosion and sediment control BMPs shall be removed within 30 days after final site stabilization is achieved or after the temporary BMPs are no longer needed. Trapped sediment shall be removed or stabilized onsite. Disturbed soil areas resulting �' from removal of BMPs or vegetation shall be permanently stabilized. � Section 12 Manage the Project � a. Phasing of Construction— Development projects shall be phased where feasible in order to prevent, to maximum extent practicable, the transport of sediment from the project site during construction. Re-vegetation of exposed areas and maintenance of that vegetation � shall be an integral part of the clearing activities for any phase. b. Clearing and grading activities for developments shall be permitted only if conducted pursuant to an approved site development plan that establishes permitted areas of � clearing, grading, cutting and filling. When establishing these permitted clearing and FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 26 � ' ' ' � grading areas, consideration should be given to minimizing removal of existing trees and minimizing disturbance/compaction of native soils except as needed for building purposes. � These permitted clearing and grading areas and any other areas required to preserve native growth protection easements or tree retention, as may be required by local jurisdictions, shall be delineated on the site plans and the development site. *I1 c. Site development shall include building-specific grading plans, including information specified by the local permitting authority such as finished grades, finished floor elevations, buildable areas, and identified drainage outiets. This information would normally be submitted with the construction drawings, but may be required prior to preliminary plat +� approval. d. 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 construction site � through a combination of the following: 1. Site condition including existing vegetative coverage, slope, soil type and proximity to receiving waters 2. Limitations on activities and the extent of disturbed areas �■ 3. 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. If, during the course of any construction activity or soil disturbance during the seasonal limitation period, silt-laden runoff leaving the site causes a violation of the surface water quality standard or if � clearing and grading limits or erosion and sediment control measures shown in the approved plan are not maintained, the local permitting authority may take enforcement action, including but not limited to, a notice of violation, administrative order, fine/penalty, � stop-work order, or correction notice. Local government may restrict clearing and grading activities where site conditions may present a significant risk of impact to property or critical areas. Contact the local permitting '"� authority for information on specific site restrictions. In Olympia, except where approved chemical treatment, full dispersion or infiltration is practiced, clearing, grading and other soil disturbing activities are prohibited in all watersheds November through February, and in Green Cove, Percival, Woodard, and Ellis Creek watershed between October through April. � e. Coordination with Utilities and Other Contractors—The primary project proponent shall evaluate, with input from utilities and other contractors, the stormwater management � requirements for the entire project, including the utilities, when preparing the Construction SWPPP. f. Inspection and Monitoring "*� 1. 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. The person shall have the skills to (1) assess site conditions and construction "'� activities that could impact stormwater runoff quality, and (2) assess erosion and sediment control measure effectiveness. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 27 � ' , l ' � 2. Certified Erosion and Sediment Control Specialist(CESCS)—A CESCS shall be identified in the Construction SWPPP and shall be onsite or on-call at all times. � Certification may be obtained an approved training program that meets the erosion and sediment control training program that meets the erosion and sediment training criteria � established by Ecology. If a pre-construction meeting is held, this person shall attend. 3. Sampling and analysis of the stormwater discharges from a construction site may be necessary on a case-by-case basis to ensure compliance with standards. Monitoring � and reporting requirements may be established by the local permitting authority when necessary. Sampling shall be per Volume I, Section 2.5.2 Element#12 of the City of Olympia Stormwater Manual. � 4. Whenever inspection and/or monitoring reveals that the BMPs identified in the C-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. g. Maintaining an Updated Construction SWPPP 1. The C-SWPPP shall be retained onsite or within reasonable access to the site. �' 2. The C-SWPPP shall be updated within 7 days to reflect any significant changes in the design, construction, operation, or maintenance at the construction site that have, or � could have, a significant effect on the discharge of pollutants to waters of the state. 3. The C-SWPPP shall be updated within 7 days if during inspections or investigations by � site staff or local or state officials, it is determined that the C-SWPPP is ineffective in controlling pollutants such that applicable discharge or surface water standards violations are apparent. • � 1 . ' ' , 1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 28 � � ' 1 ' , XII. STORMWATER MAINTENANCE PLAN � � 1 1 1 1 1 � FOOD DISTRIBUTION WAREHOUSE October 20, 2014 � , , , ' ' � FOOD DISTRIBUTION WARENOUSE 10.20.2014 PAGE 29 � I , ' ! � TABLE OF CONTENTS � I. STORMWATER FACILITY MAINTENANCE GUIDE ...................... 31 Introd uction..........................................................................................................................32 �^ What Is Stormwater Runoff?..................................................................................32 What Is a Storm Drain System and How Does It Work? .......................................32 What Does Stormwater Runoff Have to Do With Water Quality?..........................32 StormwaterFacilities..............................................................................................32 Who Is Responsible for Maintaining Stormwater Facilities?..................................32 � How to Use the Stormwater Facility Maintenance Guide? ....................................33 Includedin This Guide ...........................................................................................33 � A Regional Approach to Stormwater Management................................................33 � Your Stormwater Facilities..................................................................................................33 FacilityKey..........................................................................................................................33 SitePlan..............................................................................................................................34 � Quick List.............................................................................................................................35 MaintenanceChecklists......................................................................................................36 Catch Basins, Manholes and Inlets........................................................................37 � Ponds.....................................................................................................................39 Fencing, Shrubbery Screens and Gates................................................................41 Conveyance Pipes, Ditches and Swales ...............................................................42 Groundsand Landscaping.....................................................................................43 � Detention Vault.......................................................................................................44 ResourceListing..................................................................................................................45 LogSheet............................................................................................................................46 � II. POLLUTION SOURCE CONTROL PROGRAM.............................. 47 Purpose...............................................................................................................................48 Recommended Pollution Control Practices for Homeowners.............................................48 � Materials Used and Wastes Generated..............................................................................48 RequiredActions.................................................................................................................48 � III. GLOSSARY...................................................................................... 49 , ' , � ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 30 � � , ' , ' ' Attachment "A" � Stormwater Facilities Maintenance Program � 1 1 ,. 1 1 1 1 1 1 1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 31 � � �; � • � I. STORMWATER FACILITY MAINTENANCE GUIDE � Introduction � What Is Stormwater Runoff? When urban and suburban development covers the land with buildings, streets and parking lots, much of the native topsoil, duff, trees, shrubs and grass are replaced by asphait and concrete. �, Rainfall that would have soaked directly into the ground instead stays on the surface as stormwater runoff making its way into storm drains (including man-made pipes, ditches or swale networks), stormwater ponds, surface and groundwater and, eventually, to Puget Sound. � What Is a Storm Drain System and How Does It Work? � The storm drain system for most developments includes measures to carry, store, c/eanse and release the stormwater. Components work together to reduce the impacts of development on the environment. Impacts can include flooding that results in property damage and blocked emergency routes, erosion that can cause damage to salmon spawning habitat and pollution that harms fish � and/or drinking water supplies. The storm drain system provides a safe method to carry stormwater to the treatment and storage area. Swales and ponds filter pollutants from the stormwater by physically settling out particles, � chemically binding pollutants to pond sediments and biologically converting pollutants to less harmful compounds. Ponds also store treated water, releasing it gradually to a nearby stream or to groundwater. � What Does Stormwater Runoff Have to Do With Water Quality? Stormwater runoff must be treated because it carries litter, oil, gasoline, fertilizers, pesticides, pet � wastes, sediments and anything else that can float, dissolve or be swept along by moving water. Left untreated, polluted stormwater can reach nearby waterways where it can harm and even kill aquatic life. It can also pollute groundwater to the extent that it requires treatment before it is suitable for drinking. Nationally, stormwater is recognized as a major threat to water quality. Remember to keep everything out of stormwater systems except the rainwater they are designed to coilect. �il Stormwater Facilities Different types of drainage facilities are designed for different purposes. For example, bioswales primarily provide treatment of stormwater. Pervious pavement is designed to provide storage for � stormwater and allow for its gradual release into the ground. Who Is Responsible for Maintaining Stormwater Facilities? � All stormwater facilities require maintenance. Regular maintenance ensures proper functioning and preserves visual appeal. This Stormwater Facility Maintenance Guide was designed to explain how stormwater facilities work and provide user-friendly, straightforward guidance on facility maintenance. � You are responsible for regularly maintaining privately owned pervious pavement, catch basins, pipes and other drainage facilities on your property. Stormwater facilities located in public rights-of- *° way are maintained by local governments. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 32 � r ' S How to Use the Stormwater Facility Maintenance Guide This Maintenance Guide includes a Site Plan specific to your development and a Facility Key that � identifies the private stormwater facilities you are responsible for maintaining. A"Quick List"of maintenance activities has also been included to help you identify the more routine needs of your facility. � Included in This Guide • Comprehensive Maintenance Checklists that provide specific details on required maintenance � • Pollution Prevention Tips that list ways to protect water quality and keep storm drain systems functioning smoothly � • Resources to provide more information and technical assistance A Regional Approach to Stormwater Management '� The cities of Lacey, Olympia and Tumwater, together with Thurston County, are taking steps to educate and involve area residents in water quality issues and stormwater management. Stormwater runoff is a widespread cause of water quality impairment and stream degradation. The jurisdictions are working together with residents, businesses, community groups and schools to • address this problem. This guide focuses on providing information on ways that you can reduce stormwater impacts through pollution prevention and proper facility maintenance. � Your Stormwater Facilities This section consists of two parts that are to be used together: the Facility Key and the Site Plan. � Review the Site Plan and identify the numbers denoting a feature of the system. Then check the Facility Key for the feature type and checklist name. 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The list represents minimum maintenance to be performed and should be completed in conjunction with the other checklists for an effective � maintenance program. � ❑ Inspect catch basin grates to see that they are not clogged or broken. Remove twigs, leaves or other blockages. Contact the local jurisdiction to replace the grate if it is broken. � ❑ Inspect inlet and outlet pipes for blockages. Clear all blockages. ❑ Inspect filter strip and swales for erosion or caved in areas. � ❑ Inspect riprap (rocks) at the inlets and outlets of culverts and other pipes. If they are silted in or eroded away, replace them. � ' . � ; ' , ' � ' , ' ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 35 � ' ' � Maintenance Checklists The Maintenance Checklists in this packet are for your use when inspecting the stormwater � facilities on your property. This packet has been customized so that only the checklists for your facilities are included. If you feel you are missing a checklist, or you have additional facilities not � identified or addressed in this packet, please contact your local jurisdiction. The checklists are in tabular format for ease of use. Each describes the area to inspect, inspection frequency, what to look for and what action to take. A log sheet is included toward the end of the chapter to help you track maintenance of your storm drainage system. � Although it is not intended for the maintenance survey to involve anything too difficult or strenuous, there are a few tools that will make the job easier and safer, including: �w • A flashlight • A long pole or broom handle • Some kind of pry bar or lifting tool for pulling manhole and grate covers � • Gloves A resource list is included in the next chapter. There you will find the phone numbers of the � agencies referenced in the tables, as well as the contractors and consultants who designed and constructed your facilities. � SAFETY WARNING: In keeping with OSHA regulations, you should never stick your head or any part of your body into a manhole or other type of confined space. ' When looking into a manhole or catch basin, stand above it and use the flashlight to help you see. Use a long pole or broom handle to check sediment depths in � confined spaces. NO PART OF YOUR BODY SHOULD BREAK THE PLANE OF ,� THE OPEN HOLE. ' � ' ' ' ' , ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 36 � ' ' � Catch Basins, Manholes and Inlets � These structures are typically located in the streets and public rights-of-way. Local jurisdictions are responsible for routine maintenance of the pipes and catch basins in rights-of-way, whereas � homeowners are responsible for keeping the grates clear of debris in all areas as well as pipes and catch basins in private areas. Inspection Frequency Look For Action � Area Catch Basin During and Accumulation of trash or debris in front Remove biocking trash or Opening after major of catch basin opening that prevents debris with a rake and , � storms water from flowing in. clean off the grate. Catch basin Quarterly Sediment or debris in the basin. No Remove debris from more than half the depth from the catch basin. � bottom of the pipe to the bottom of the basin should be allowed to accumulate. Use a long stick or broom handle to poke into sediment � and determine depth. Inlet and Quarterly Trash or debris in the pipes that has Remove trash or debris Outlet Pipes exceeded 1/5 of their height. Ensure from inlet and outlet � there are not tree roots or other pipes. vegetation growing in the pipes. Inlet and Annually Cracks wider than '/z inch and longer Repair cracks or replace � Outlet Pipe than 12 inches at the joint of any inlet the joints. Joints or outlet pipe. Also check for evidence of sediment entering the catch basin through cracks. � Grate Quarterly Cracks longer than 2 inches or Replace grate if multiple cracks. necessary. Frame Quarterly Confirmation that the frame is sitting Repair or replace the � flush on top of the concrete structure frame so it is flush with (slab). A separation of more than 3/ the slab. inch between the frame and the slab should be corrected. � Catch Basin Annually Cracks wider than '/ inch and longer Replace or repair the than 3 feet. Also check for any basin. Contact a � evidence of sediment entering the professional engineer for catch basin through cracks. evaluation. Determine whether or not the structure is sound. � Checklist continues on next page. � � �, FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 37 � ' ' ' Catch Basins, Manholes and Inlets Checklist, Continued � Inspection Area Frequency Look For Action Catch Basin Quarterly Chemicals (such as natural Clean out catch basin. Contact your � gas, oil and gasoline) that local jurisdiction or Thurston County may have entered the catch Environmental Health if you detect a basin. Check for noxious color, odor or oily sludge. � odor or oily sludge. Oil/Water Quarterly Significant sludge, oil, Remove the catch basin lid and skim Separator grease or scum layer off oil layer. Pour oil into a �■ (downturned covering all or most of the disposable container, seal container, elbow or"T" in water surface. wrap securely in newspaper, and Catch Basin) place it in the trash. Water surface should be ciear of oily layer. Pipe Elbow Quarterly Damage to top or bottom of If pipe is broken, replace pipe in '� pipe; determine whether accordance with approved plans on pipe is plumb. file with your local jurisdiction. � ' , ' ' 1 ' ' t � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 38 � � , � � Ponds There are essentially three kinds of ponds: treatment ponds, infiltration ponds and detention ponds. Although each pond has unique maintenance requirements, there are also many things they have � in common. Your facilities include two wet ponds and two infiltration ponds. Inspection Frequency Look For Action Area � Entire Pond Quarterly Yard waste such as grass Remove trash and debris and clippings and branches in dispose of properly. basin; presence of glass, � plastic, metal, foam or coated paper. Entire Pond Quarterly Vegetation that may constitute Remove invasive or noxious � a public hazard, e.g., tansy vegetation. Do not spray ragwort, poison oak, stinging chemicals on vegetation nettles, devilsclub. without obtaining guidance from WSU Cooperative � Extension and approval from City or County. Entire Pond Quarterly Presence of chemicals (e.g., First, attempt to locate source � natural gas, oil or gasoline), of pollution; then call Moderate noxious odor or sludge. Risk Waste program at Thurston County Environmental Health to report � the hazard. Entire Pond Quarterly Sparse, weedy or overgrown Grassy ponds: selectively grass in grassy (dry/infiltration) thatch, aerate and re-seed � ponds; presence of invasive ponds. Grass should be kept species or sparse growth of less than 8 inches high. Wet plants in wet ponds. ponds: hand-plant nursery- � grown wetland plants in bare areas. Contact WSU Cooperative Extension for guidance on invasive species. � Pond bottoms should have uniform dense coverage of � desired plant species. � Entire Pond Quarterly Evidence of rodent holes if Destroy rodents and repair facility is a dam or berm. Water dam or berm. Contact should not flow through rodent Thurston County Health � holes. Department for guidance. Entire Pond Quarterly Nuisance insects such as Destroy or remove insects. wasps, hornets or mosquitoes Contact WSU Cooperative that may interfere with Extension for guidance. � maintenance. � Checklist continues on next page. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 39 � ' . ' � Ponds Checklist, Continued Inspection � Area Frequency Look For Action Entire Pond Annually Confirmation that trees are not Prune tree limbs to allow for � interfering with maintenance maintenance. Some trees (i.e., mowing, silt removal or may be cut. access). � Inlet Annually Confirmation that the riprap Replace rocks and/or remove under the inlet pipe is intact sediment. and that no native soil is � exposed. Also, look for accumulations of sediment greater than half the height of the rocks. � Outlet Quarterly A free-flowing overFlow that is Replace riprap if missing. clear of debris. Remove trash or debris and dispose of properly. � Side Slopes Annually Signs of erosion around inlets Attempt to determine the and outlets. Inspect berms for cause of erosion and repair it. signs of sliding or settling. Stabilize slopes by reinforcing +� Take action if eroded damage with rock, planting grass, or is over 2 inches deep and compacting soil. Contact where there is potential for WSU Cooperative Extension continued erosion. for guidance on slope reinforcement. „� Storage Area Annually Sediment build-up on pond Remove the sediment and re- bottom. A buried or partially seed the pond if necessary to � buried outlet structure or very improve infiltration and control slow infiltration rate may erosion. indicate significant sediment � deposits. Dikes Annually Significant settling of any part Build dike back to the original of dike. elevation. Emergency Annually Intact riprap protective area. Replace rocks so all native soil Overflow/ Repair if any native soil is is covered. � Spillway exposed. Trench Drain Quarterly Confirmation that the grate is Remove debris from grate, � clear of debris and that the clean drain. drain is not plugged. � , � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 40 � , , � Fencing, Shrubbery Screens and Gates � Fences and shrubbery screens aren't typically required for stormwater ponds. If the slopes of the sides are too steep, usually some kind of barricade is constructed. � Inspection Frequency Look For Action Area Fence or Quarterly Inspect the fence or screen to Mend the fence, repair erosion, � Shrubbery ensure that it blocks easy or replace the shrubs to form a Screen entry to the facility. Make sure solid barrier. erosion hasn't created an � opening under fence. Shrubbery Quarterly Confirm that shrubbery is not Trim and weed shrubbery to Screen growing out-of-control or that it provide appealing aesthetics. is not infested with weeds. Do not use chemicals to control � weeds. Wire Fences Annually Confirmation that fence is still Straighten posts and rails if in alignment. necessary. � Wire Fences Annually Missing or loose tension wire. Replace or repair tension wire so it holds fabric. Wire Fences Annually Missing, loose or sagging Replace or repair barbed wire so � barbed wire. that it doesn't sag between �,: posts. Wire Fences Annually Rust or scaling. Paint or coat rusting or scaling � parts with a protective coating. Wire Fences Quarterly Confirm that there are no Repair holes so that there are no holes in the fabric or fencing. openings in the fabric or fencing. � Gate Quarterly Confirm that the gate is not Repair or replace the gate to broken,jammed or missing allow entry of maintenance and that it opens easily. people and equipment. If a lock is used, make sure you have a �J key. , � , � � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 41 � � ' ' � Conveyance Pipes, Ditches and Swales Inspection Frequency Look For Action � Area Pipes Annually Confirmation that accumulated Clean pipes of all sediment '� sediment has not exceeded and debris. Remove all 20% of the diameter of the pipe vegetation so that water flows � and that vegetation has not freely through pipes. Repair reduced free movement of or replace pipe as necessary. water through pipes. Ensure "'� that the protective coating is not damaged and rusted. Dents � should not significantly impede flow. Pipe should not have major cracks or tears allowing � water to leak out. Open Ditches Quarterly Yard waste or litter in the ditch. Remove trash and debris and dispose of properly. Open Ditches Annually Confirmation that accumulated Clean ditch of all sediment and � sediment has not exceeded debris. 20% of the depth of the ditch. O en Ditches Annuall Ve etation e. "� p y g ( g., weedy shrubs Clear blocking vegetation so and Swales or saplings) that reduces the that water flows freely through free movement of water ditches. Grassy vegetation through ditches or swales. should be left alone. Open Ditches Quarterly Signs of erosion. Inspect Eliminate causes of erosion. � and Swales slopes for signs of sloughing or Stabilize slopes by using settling. Action is needed appropriate erosion control � where eroded damage is over 2 measures (e.g., reinforce with inches deep and where rock, plant grass, compact potential for continued erosion soil). exists. � Open Ditches Annually Adequate rock placement in Replace rocks to design and Swales splash pad, check dam or standard. lining. Native soii should not be visible. � Swales Quarterly Adequate grass coverage. Aerate soils, reseed and Take action if coverage is mulch bare areas. Keep grass � sparse and weedy, or areas are less than 8 inches high. overgrown with woody Remove woody growths, vegetation. regrade and reseed as necessary. +�II Swales Quarterly Confirmation that swale has not If possible, speak with been filled in or blocked by homeowner and request that structures, shrubbery, etc. the swale area be restored. Swales Annually Standing water in swale or very A survey may be needed to „� slow flow velocity. Stagnation. verify grades. Grades should be between 1 % and 5 %. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 42 � ' , . � � Grounds and Landscaping Inspection Frequency Look For Action � Area Landscaped Quarterly Uncontrolled weed growth in If possible, pull weeds by hand to � Areas landscaped areas. avoid using chemical weed controls. Landscaped Quarterly Presence of poison ivy or Remove poisonous vegetation or Areas other poisonous vegetation or insect nests. � insect nests. Landscaped Quarterly Yard waste or litter. Remove and dispose of properly. Areas � Landscaped Quarterly Noticeably visible rills in Identify the causes of erosion and Areas landscaped areas. take steps to slow down or disperse the water. Fill in � contour; seed area. Trees and Annually Split, broken or otherwise Trim trees and shrubs to restore Shrubs damaged tree parts and shape. Replace severely � shrubs. damaged trees and shrubs. Trees and Annually Blown down or knocked over Replant trees or shrubs, Shrubs trees or shrubs. inspecting for injury to stem or � roots. Replace if severely damaged. Trees and Annually Exposed roots, inadequate Place stakes and rubber-coated Shrubs support, severe leaning. ties around young trees/shrubs � for support. ' ' ' ' ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 43 � � , , Detention Vault This facility is for pretreatment of stormwater prior to entering the infiltration pond. � Inspection Frequency Look For Action � Area Entire Vault Quarterly Sediment or debris. First, attempt to locate the source for the pollution; then call the Moderate Risk Waste program at Thurston County Environmental ,rr Heath to report the hazard; then call maintenance contractor. � InIeUOutlet Quarterly Sediment or debris. Call maintenance contractor. Vault Entire Annually Check maintenance Call maintenance contractor. � Vault schedule. � , ' , ' ' .' , ' , � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 44 � r ' � Resource Listing � If you suspect a problem exists, please contact your local jurisdiction at one of the numbers below and ask for technical assistance. � Contact Numbers: City of Yelm (360)458-8417 � Washington State University (WSU) Cooperative Extension (360) 786-5445 � � Engineer's Information: HATTON GODAT PANTIER 3910 Martin Way E., Suite B �, Olympia, WA 98506 (360) 943-1599 � � , ' ' ' ' ' ' ' � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 45 � ' ' . � Log Sheet � Use log sheets to track maintenance checks and what items, if any, are repaired or altered. Make copies of this page; use a fresh copy for each inspection. The completed sheets will serve as a record of maintenance activity and will provide valuable information about how your facilities are �I! operating. Log sheets should be kept in a dry, readily accessible place. INSPECTION DATE: PERFORMED BY: � PHONE NUMBER: ADDRESS: � POSITION: CITY,ST ZIP: � � � � � � � � � .r1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 46 � ' � ' 1 ' ' � Attachment "B" Pollution Source Control Program � � � 1 1 1 . 1 1 1 1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 47 � ' ' .�.i . � , II. POLLUTION SOURCE CONTROL PROGRAM � Purpose Pollution source controls are actions taken by a person or business to reduce the amount of � pollution reaching surface and ground waters. Controls, also calied "best management practices" (BMPs) include: Altering the activity(e.g., substitute non-toxic products, recycle used oil, route floor drains to sanitary sewer rather than storm sewer) ,� Enciosing or covering the activity (e.g., building a roof) Segregating the activity (e.g., diverting runoff away from an area that is contaminated) � Routing runoff from the activity to a treatment alternative (e.g., a wastewater treatment facility, sanitary sewer, or stormwater treatment area) � Recommended Poilution Control Practices For Business Owners Pollution source controls are needed because of the contamination found in runoff from commercial areas and the effect of this contamination on aquatic life and human health. Research on urban � runoff in the Puget Sound area and elsewhere has found oil and grease, nutrients, organic substances, toxic metals, bacteria, viruses and sediments at unacceptable leveis. Effects of contaminated runoff include closure of shellfish harvesting areas and swimming areas, mortality of � young fish and other aquatic organisms, tumors on fish and impairment of fish reproduction. Materials Used and Wastes Generated � Of particular concern are drives and parking areas. Because of heavy vehicle usage, the concentration of oil and grease in stormwater may exceed the Ecology guidelines of 10 mg/1. Although there are no local data to confirm this view, limited research in the San Francisco Bay � area found the mean concentration of oil and grease in stormwater to exceed 10 mg/1. Required Actions ,� The following actions shall be taken to ensure that pollution generated on site shall be minimized: 1. Warning signs (e.g., "Dump No Waste— Drains to Stream") shall be painted or embossed on or adjacent to all storm drain inlets. They shall be repainted as needed. Materials needed to undertake this task can be purchased or may be available from the Public Involvement � Coordinator for the Department of Public Works. 2. Sediment removed from basins, ponds and swales shall be disposed of in a proper manner. � Contact the local governing jurisdiction for inspection prior to completing this task. 3. No activities shall be conducted on site that are likely to result in short-term, highly concentrated discharge of pollution to the stormwater system. Such activities may include, but � are not limited to, heavy vehicle maintenance and cleaning of equipment used in the periodic maintenance of buildings and paved surfaces. 4. Use of pesticides and fertilizers shall be minimized. 5. Do not dump paint, solvents, oils, or other such substances, including landscape waste, into � storm drains or ponds. A local automotive service center may recycle oil and oii filters. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 48 � � 1� � ' � III. GLOSSARY � BEST MANAGEMENT PRACTICE (BMP) - Structures, conservation practices or regulations that improve quality of runoff or reduce the impact of development on the quantity of runoff. � BIOFILTER (SWALE) -A wider and flatter vegetated version of a ditch over which runoff flows at uniform depth and velocity. Biofilters perform best when vegetation has a thick mat of roots, leaves and stems at the soil interface (such as grass). � BIOFILTRATION -The process through which pollutant concentrations in runoff are reduced by filtering runoff through vegetation. BUFFER -The zone that protects aquatic resources by providing protection of slope stability, � attenuation of runoff and reduction of landslide hazards. An integral part of a stream or wetland ecosystem, it provides shading, input of organic debris and coarse sediments to streams. It also allows room for variation in stream or wetland boundaries, habitat for wildlife and protection from � harmful intrusion. CATCH BASIN -An inlet for stormwater set into the ground, usually rectangular, made of concrete and capped with a grate that allows stormwater to enter. � CHECK DAM -A dam (e.g., rock, earthen, log) used in channels to reduce water velocities, promote sediment deposition and/or enhance infiltration. COMPOST STORMWATER FILTER =A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of specially prepared bigleaf maple compost. CONSTRUCTED WETLAND-A wet pond with dead storage at varied depths and planted with wetland plants to enhance its treatment capabilities. � CONTROL STRUCTURE (FLOW RESTRICTOR) -A manhole and/or pipe structure with a flow- regulating or metering device such as a weir or plates with small holes known as orifices. This structure controls the rate at which water leaves the pond. �_ CONVEYANCE-A mechanism or device for transporting water including pipes, channels (natural and man-made), culverts, gutters, manholes, etc. CRITICAL AREA—Areas, such as wetlands, streams and steep slopes, defined by ordinance or �3 resolution of the jurisdiction. Also known as"environmentally sensitive areas." CULVERT-A conveyance device (e.g., concrete box, pipe) that conveys water from a ditch, swale � or stream under(usuaily across) a roadway or embankment. DEAD STORAGE -The volume of storage in a pond below the outlet that does not drain after a storm event. This storage area provides treatment of the stormwater by allowing sediments to � settle out. DETENTION FACILITY-A facility (e.g., pond, vault, pipe) in which surface and stormwater is temporarily stored. �r DETENTION POND-A detention facility in the form of an open pond. DISPERSION TRENCH -An open-top trench filled with riprap or gravel that takes the discharge from a pond, spreads it out and spills (bubbles) the flow out along its entire length. Dispersion � trenches are used to simulate"sheet flow" of stormwater from an area and are often used to protect sensitive adjacent areas, such as wetlands. DRAINAGE SYSTEM -The combination of Best Management Practices (BMPs), conveyances, � treatment, retention, detention and outfall features or structures on a project. FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 49 � ' • ' � DROP STRUCTURE -A structure for dropping water to a lower elevation and/or dissipating energy. A drop may be vertical or inclined. � DRY POND-A detention facility that drains completely after a storm. This type of pond has a pipe outlet at the bottom. EASEMENT-A right afforded a person to make limited use of another's real property. Typical '� easements are for pipes or access to ponds; they may be 15 to 20 feet wide. EMERGENCY OVERFLOW OR SPILLWAY-An area on the top edge of the pond that is slightly lower in elevation than areas around it. This area is normally lined with riprap. The emergency overflow is used only if the primary and secondary outlets of the pond fail, in the event of extreme .�t storms or if the infiltration capability of the pond becomes significantly diminished. If the emergency overflow ever comes into play, it may indicate the pond needs to be upgraded. � ENERGY DISSIPATER-A rock pad at an outlet designed to slow the water's velocity, spread out the water leaving the pipe or channel and reduce the potential for erosion. FREEBOARD -The vertical distance between the design high water mark and the elevation of the � top of the pond. Most ponds have one to two feet of freeboard to prevent them from overflowing. INFILTRATION -The soaking of water through the soil surface into the ground (percolation). (Many ponds are designed to fuily infiltrate stormwater and thus do not have a regularly used � discharge pipe.) INFILTRATION FACILITY(or STRUCTURE) -A facility (pond or trench) that retains and percolates � stormwater into the ground, having no discharge (to any surface water) under normal operating conditions. JUNCTION - Point where two or more drainage pipes or channels converge (e.g., a manhole). JURISDICTION - Olympia, Lacey, Tumwater or Thurston County (as applicable). � LINED POND or CONVEYANCE -A facility, the bottom and sides of which have been made impervious (using, for example, a plastic liner or clay/silt soil layer) to the transmission of liquids. � LIVE STORAGE-The volume of storage in a pond above the outlet that drains after a storm event. This storage area provides flood control and habitat protection for nearby streams. MANHOLE-A larger version of a catch basin, often round, with a solid lid. Manholes allow access � to underground stormwater pipes for maintenance. NATURAL CHANNEL- Stream, creek, river, lake, wetland, estuary, gully, swale, ravine or any open conduit where water will concentrate and flow intermittently or continuously. OIL-WATER SEPARATOR -A structure or device used to remove oil and greasy solids from water. � They operate by using gravity separation of liquids that have different densities. Many catch basins have a downturned elbow that provides some oil-water separation. � OUTFALL -The point where water flows from a man-made conduit, channel or drain into a water body or other natural drainage feature. wE PERVIOUS PAVEMENT—Concrete or asphalt that allows stormwater to infiltrate into the ground. RETENTION FACILITY-An infiltration facility. RETENTION POND -A retention facility that is an open pond. REVETMENTS - Materials such as rock or keystones used to sustain an embankment, such as in � a retaining wall. � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 50 � ' ' � RIPRAP - Broken rock, cobbles or boul�lers placed on earth surfaces, such as on top of a berm for � the emergency overflow, along steep slopes or at the outlet of a pipe, for protection against the action of water. Also used for entrances to construction sites. RUNOFF -Stormwater. r" SAND FILTER -A treatment facility that removes sediment and pollutants from stormwater by percolating water through a layer of sand. STORMWATER -That portion of precipitation that falls on property and that does not naturally percolate into the ground or evaporate but flows via overland flow, channels or pipes into a defined �,,, surface water channel or a constructed infiltration facility. Stormwater includes washdown water and other wastewater that enters the drainage system. SWALE -A shallow drainage conveyance with relatively gentle side slopes, generally with flow depths less than one foot. This term is used interchangeably with "BIOFILTER". TRASH RACK or BAR SCREEN -A device(usually a screen or bars) that fits over a pipe opening � to prevent large debris such as rocks or branches from entering and partially blocking the pipe. WET POND-A stormwater treatment pond designed with a dead storage area to maintain a continuous or seasonal static water level below the pond outlet elevation. � � � ' ' , ' � ' � • . � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE 51 � 1 ' , ' � > � , ' APPENDIX A — Soil Survey Information � 1 1 1 1 1 1 1 1 1 � 1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE A-1 � , � USDA United States A product ofthe National Custom Soil Resource �— Department of Cooperative Soil Survey, Agriculture ajointeffortoftheUnited Reportfor n '(� States Department of � Iv�{�S Agricultureandother Thurston County � � Federal agencies,State � Natural agencies including the Resources Agricultural Experiment Area, Was h i n.gto n Conservation Stations,and local Service participants FOOD DISTRIBUTION � WAREHOUSE , ' � _ -�:.-T-�.- ,�, ,>A ��,� � � ° �. � j� >.� ..�. } �.>�, #, t Y�i . � ` ��„•,� + , � � � � �:a„t� � `+'. � n ,a� � ,....�'k3�� 3. 'n.. .v'�. • �...r.:+.a � �I� � 9 ��' � �� x �� a�t . €; '� ..�� . ' �I� r dA �� A � . :t a �I.;. .`�+�.: '4 �'�� °k�r 's_,e.., zL,i. . ,�t' � � C ��. ' _�� :t�'. 1� , �' . � 4�'z. *„ 'i�`�� i,��s� � at�4r .�aR"`Ri' + tro. . ..� ` � '�� ' • r r�?-y '°�^ .r� �� .,�,�� : 1 �� +b �� , � °.�a �t`�`ao,: =a;. �'""� �,��'� �, 9 . , o , . � : � .._ �.... . . , � :�.. �� ;w # ,�. '�a� . � � �;� { �.�.::� ` ` + .�i �+ ��t �I li! ��`�` �� '#�, .• �� :, '�'� �1,,�� ', ��t � � . � ��, � ��r��ft � . �r� -- --_ :. , ,. ., � � �October 17,2014 � ' ' , ' 1 , � Preface � Soil surveys contain information that affects land use planning in survey areas.They highlight soil limitations that affect various land uses and provide information about the properties of the soils in the survey areas.Soil surveys are designed for many different users,including farmers,ranchers,foresters,agronomists,urban planners, community officials,engineers,developers,builders,and home buyers.Also, � conservationists,teachers,students,and specialists in recreation,waste disposal, and pollution control can use the surveys to help them understand,protect,or enhance the environment. � Various land use regulations of Federal,State,and local govemments may impose special restrictions on land use or land treatment.Soil surveys identify soil properties that are used in making various land use or land treatment decisions.The information is intended to help the land users identify and reduce the effects of soil limitations on � various land uses.The landowner or user is responsible for identifying and complying with existing laws and regulations. Although soil survey information can be used for general farm,local,and wider area planning,onsite investigation is needed to supplement this information in some cases. � Examples inciude soil quality assessments(http:/lwww.nres.usda.govlwpsJportal! nres/main/soils/healthn and certain conservation and engineering applications.For more detailed information,contact your locai USDA Service Center(http:// offices.sc.egov.usda.govAocator/app?agency=nres)or your NRCS State Soil Scientist(http:/lwww.nres.usda.govlwps/portal/nres/detail/soils/contactus/? � cid=nres142p2_053951). Great differences in soil properties can occur within short distances.Some soils are seasonally wet or subject to flooding.Some are too unstable to be used as a foundation for buildings or roads.Clayey or wet soils are poorly suited to use as septic tank absorption fieids.A high water table makes a soil poorly suited to basements or underground installations. � The National Cooperative Soil Survey is a joint effort of the United States Department of Agriculture and other Federal agencies,State agencies including the Agricultural� � Experiment Stations,and local agencies.The Natural Resources Conservation Service(NRCS)has leadership for the Federal part of the National Cooperative Soil Survey. Information about soils is updated periodically.Updated information is available � through the NRCS Web Soil Survey,the site for official soil survey information. The U.S.Department of Agriculture(USDA)prohibits discrimination in ali its programs and activities on the basis of race,color,national origin,age,disability,and where applicable,sex,marital status,familial status,parental status,religion,sexual orientation,genetic information,political beliefs,reprisal,or because all or a part of an individual's income is derived from any public assistance program.(Not all prohibited � bases apply to all programs.)Persons with disabilities who require alternative means 2 � ' ' ' ' ' ' � for communication of program information(Braille,large print,audiotape,etc.)should contact USDA's TARGET Center at(202)720-2600(voice and TDD).To file a complaint of discrimination,write to USDA,Director,Offce of Civil Rights,1400 Independence Avenue,S.W.,Washington,D.C.20250-9410 or call(800)795-3272 � (voice)or(202)720-6382(TDD).USDA is an equal opportunity provider and employer. ' ' , , ' ' ' ' ' ' � 3 , ' ' , , , � � Contents Preface...................................................................................................................2 � How Soil Surveys Are Made..................................................................................5 SoilMap..................................................................................................................7 SoilMap................................................................................................................8 � Legend..................................................................................................................9 MapUnit Legend................................................................................................10 MapUnit Descriptions........................................................................................10 Thurston County Area,Washington................................................................12 � 110—Spanaway gravelly sandy loam,0 to 3 percent slopes......................12 111—Spanaway graveliy sandy loam,3 to 15 percent slopes....................12 References............................................................................................................14 , , ' , ' ' ' 4 � , ' ' ' ' , � � How Soil Surveys Are Made F � Soil surveys are made to provide information about the soils and miscellaneous areas in a specific area.They include a description of the soils and miscellaneous areas and � their location on the landscape and tables that show soii properties and limitations affecting various uses.Soil scientists observed the steepness,length,and shape of the slopes;the general pattern of drainage;the kinds of crops and native plants;and the kinds of bedrock.They observed and described many soil profiles.A soil profile is the sequence of naturai layers,or horizons,in a soil.The profile extends from the � surface down into the unconsolidated material in which the soil formed or from the surface down to bedrock.The unconsolidated material is devoid of roots and other living organisms and has not been changed by other biological activity. Currentiy,soils are mapped according to the boundaries of major land resource areas � (MLRAs).MLRAs are geographicaily associated land resource units that share common characteristics related to physiography,geology,climate,water resources, soils,biological resources,and land uses(USDA,2006).Soil survey areas typically consist of parts of one or more MLRA. � The soils and miscellaneous areas in a survey area occur in an orderly pattern that is related to the geology,landforms,relief,climate,and natural vegetation of the area. Each kind of soil and miscellaneous area is associated with a particular kind of landform or with a segment of the landform.By observing the soils and misceilaneous areas in the survey area and relating their position to specific segments of the � landform,a soil scientist develops a concept,or model,of how theywere formed.Thus, during mapping,this model enables the soil scientist to predict with a considerable degree of accuracy the kind of soii or miscellaneous area at a specific location on the landscape. � Commonly,individual soils on the landscape merge into one another as their characteristics gradually change.To construct an accurate soil map,however,soil scientists must determine the boundaries between the soils.They can observe only a limited number of soil profiles.Nevertheless,these observations,supplemented by an understanding of the soil-vegetation-landscape relationship,are su�cient to verify � predictions of the kinds of soil in an area and to determine the boundaries. Soil scientists recorded the characteristics of the soil profiles that they studied.They noted soil color,texture,size and shape of soil aggregates,kind and amount of rock ' fragments,distribution of plant roots,reaction,and other features that enable them to � identiTy soils.After describing the soils in the survey area and determining their properties,the soil scientists assigned the soils to taxonomic classes(units). Taxonomic classes are concepts.Each taxonomic class has a set of soil characteristics with precisely defined limits.The classes are used as a basis for comparison to classify soiis systematically.Soil taxonomy,the system of taxonomic � classification used in the United States,is based mainly on the kind and character of soil properties and the arrangement of horizons within the profile.After the soil scientists classified and named the soils in the survey area,they compared the � 5 �+ 1 ' ' ' ' � Custom Soil Resource Report individual soils with similar soils in the same taxonomic class in other areas so that they could confirm data and assemble additional data based on experience and � research. The objective of soil mapping is not to delineate pure map unit components;the � objective is to separate the landscape into landforms or landform segments that have similar use and management requirements.Each map unit is defined by a unique combination of soil components and/or miscellaneous areas in predictable proportions.Some components may be highiy contrasting to the other components of the map unit.The presence of minor components in a map unit in no way diminishes � the usefulness or accuracy of the data.The delineation of such landforms and landform segments on the map provides su�cient information for the development of resource plans.If intensive use of small areas is planned,onsite investigation is needed to define and locate the soils and miscellaneous areas. � Soil scientists make many field observations in the process of producing a soil map. The frequency of observation is dependent upon several factors,including scale of mapping,intensity of mapping,design of map units,complexity of the landscape,and experience of the soil scientist.Observations are made to test and refine the soil- landscape model and predictions and to verify the classification of the soils at specific � locations.Once the soil-landscape model is refined,a significantly smaller number of measurements of individual soil properties are made and recorded.These measurements may include field measurements,such as those for color,depth to bedrock,and texture,and laboratory measurements,such as those for content of sand,silt,clay,salt,and other components.Properties of each soil typically vary from one point to another across the landscape. � Observations for map unit components are aggregated to develop ranges of characteristics for the components.The aggregated values are presented.Direct � measurements do not exist for every property presented for every map unit component.Values for some properties are estimated from combinations of other properties. While a soil survey is in progress,samples of some of the soils in the area generally are collected for laboratory analyses and for engineering tests.Soil scientists interpret � the data from these analyses and tests as well as the field-observed characteristics and the soil properties to determine the expected behavior of the soils under different uses.Interpretations for all of the soils are field tested through observation of the soils in different uses and under different levels of management.Some interpretations are modified to fit local conditions,and some new interpretations are developed to meet local needs.Data are assemhled from other sources,such as research information, � production records,and field experience of specialists.For example,data on crop yields under defined levels of management are assembled from farm records and from field or plot experiments on the same kinds of soil. � Predictions about soil behavior are based not only on soil properties but also on such variables as climate and biological activity.Soil conditions are predictable over long periods of time,but they are not predictable from year to year.For example,soil scientists can predict with a fairly high degree of accuracy that a given soil will have � a high water table within certain depths in most years,but they cannot predict that a high water table will always be at a specific level in the soil on a specific date. After soil scientists located and identified the significant natural bodies of soil in the survey area,they drew the boundaries of these bodies on aerial photographs and identified each as a specific map unit.Aerial photographs show trees,buildings,fields, roads,and rivers,all of which help in locating boundaries accurately. � 6 � ' ' � , ' ' ' � r � Soil Map r � The soil map section includes the soil map for the defined area of interest,a list of soil map units on the map and extent of each map unit,and cartographic symbols r displayed on the map.Also presented are various metadata about data used to I produce the map,and a description of each soil map unit. YA ' . � � ;.� � �a �; °.;� ,r� ��` � ' ' : , ' ' , � � 7 � ' ' , 1 � 3 Custom Soil Resource Report Soil Map 3 -- , 53fi1'1�� 530I2C0 53C23J 53p26p 53C290 530320 53�350 53�3d0 53p110 .'t 46°STTN . �y° 'P� .,.. . ..�L� I a.r 46°5]TN . v� I�i.. tly' . , .� �`: , k : � � . �� .. � ��' rj ' ��'� �"S)�3`. �#�' �, �. �� '�� t�G & }3 � �� jr� P #G �, -+x �� ' � � 2i� � � �-�� •�.� �'�� '.w �'.�.—�&` � ��. �a �' "�� c�-�t �^�_� e � � .x°st..� � ��. 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' ...._ ...... _..__. .... .3 � Map Sole:1:1,280 if pnrMd m A lard�pe(11"x&5")sheet ;q Me�rs � N 0 15 30 fi0 90 � � A � 0 50 lOD 200 �0 Map proja�4on:Web Mxmtor C'amer mordinahs:W�564 6dge da:UiM 7nre lON W684 S � ' ' ' , ' ' � ' �. Custom Soil Resource Report � MAP LEGEND MAP INFORMATION Area of Interest(AOq � Spoil Area The soil surveys that comprise your AOI were mapped at 124,000. �� O Area of Interest(AOI) �r Stony Spot ---- soits � very 5tony Spot �✓arning:Soil Map may not be valid at this scale. �Jl Soil Map Unit Polygons � � Wet Spot Enlargement of maps 6eyond the scale of mapping can cause � ..�. Soil Map Unic Lines . misunderstanding of the detail of mapping and accuracy of soil line �� Other 0 soil Map Unit Points placement.The maps do not show the small areas of contrasting Special Line Features soils that could have been shown at a more detailed scale. Special Point Features � Blowoul �NaterFeatures ,....,_ streams and canais Please rely on the bar scale on each map sheet for map � � Bo❑ow Pit measurements. Tronsportation Clay Spot � t}{ Rails Source of Map: Natural Resources Conservation Service �^ Closed Depression u Intersta[e Highways Web Soil Survey URL� http://websoilsurvey.nres.usda.gov � Gravel Pit ,,,�, US Routes Coordinate System: Web Mercator(EPSG:3857) � . p, �ravelly spot . Major Roads Maps from the Web Soil Survey are based on the Web Mercator � Landfill �ocai Roads projection,which preserves direc[ion and shape but distorts distance and area.A projection that preserves area,such as the � Lava Flow Background Albers equal-area conic projection,should be used if more accurate � Marsh orswamp . Aerial Phofography calculations of distance or area are required. � ry�: Mine or Quarry This product is generated from the USDA-NRCS certifed data as of (� Miscellaneous Water the version date(s)listed below. � Perennial Water Soil Survey Area: Thurston Counry Area,Washington a�r Rock oumrop Survey Area Data: Version 6,Sep 30,2014 � �. Saline Spot Soil map units are labeled(as space allows)for map scales 1:50,000 Sandy Spot or larger. � Severely Eroded Spot Date(s)aerial images were photographed: Jul 8,2010—Aug 20, � � Sinkhole 201� . �. SlideorSlip The orthophoto or other base map on which the soil lines were � sodic spot compiled and digitized pro6ably differs from the background imagery displayed on these maps.As a result,some minor shifting � � 9 � ' ' , ' ' , ' , , ' ' � , ' ' _ � t ' ' ' i 1 1 1 1 . 1 � Custom Soil Resource Report � Ma Unit Le end p J � Thurston County Area,Washington(WA667) Map Llnit Symbol Map Unit Name Acres in AOI Percent of AOI 110 Spanaway gravelly sandy loam, 5.5 80.7% � 0 to 3 percent slopes 111 Spanaway gravelly sandy loam, 1.3 19.3% 3 to 15 percent slopes Totals for Area of Interest 6.8 100.0% � Ma Unit Descri tions p p i� The map units delineated on the detailed soil maps in a soil survey represent the soils �+ or miscellaneous areas in the survey area.The map unit descriptions,along with the maps,can be used to determine the composition and properties of a unit. � A map unit delineation on a soil map represents an area dominated by one or more major kinds of soil or miscellaneous areas.A map unit is identified and named according to the taxonomic classification of the dominant soils.Within a taxonomic class there are precisely defined limits for the properties of the soils.On the landscape, however,the soils are natural phenomena,and they have the characteristic variability � of all natural phenomena.Thus,the range of some observed properties may extend beyond the limits defined for a taxonomic class.Areas of soils of a single taxonomic class rarely,if ever,can be mapped without including areas of other taxonomic classes.Consequently,every map unit is made up of the soils or miscellaneous areas for which it is named and some minor components that belong to taxonomic classes � other than those of the major soils. Most minor soils have properties similar to those of the dominant soil or soils in the map unit,and thus they do not affect use and management.These are called noncontrasting,or similar,components.They may or may not be mentioned in a � particular map unit description.Other minor components,however,have properties and behavioral characteristics divergent enough to affect use or to require different management.These are called contrasting,ordissimilar,components.Theygenerally are in small areas and could not be mapped separately because of the scale used. Some small areas of strongly contrasting soils or miscellaneous areas are identified by a special symbol on the maps.If included in the database for a given area,the contrasting minor components are identified in the map unit descriptions along with some characteristics of each.A few areas of minor components may not have been observed,and consequently they are not mentioned in the descriptions,especially where the pattern was so complex that it was impractical to make enough observations � to identify all the soils and miscellaneous areas on the landscape. The presence of minor components in a map unit in no way diminishes the usefulness or accuracy of the data.The objective of mapping is not to delineate pure taxonomic classes but rather to separate the landscape into landforms or landform segments that � have similar use and management requirements.The delineation of such segments on the map provides sufficient information for the development of resource plans.If � 10 ' ' , � , � Custom Soil Resource Report intensive use of small areas is planned,however,onsite investigation is needed to define and locate the soils and miscellaneous areas. � An identifying symbol precedes the map unit name in the map unit descriptions.Each description includes generai facts about the unit and gives important soil properties � and qualities. Soils that have profiles that are almost alike make up a soil series.Except for differences in texture of the surFace layer,all the soils of a series have major horizons that are similar in composition,thickness,and arrangement. � Soils of one series can differ in te�ure of the sur�ace layer,slope,stoniness,salinity, degree of erosion,and other characteristics that affect their use.On the basis of such differences,a soil series is divided into soil phases.Most of the areas shown on the detailed soil maps are phases of soil series.The name of a soil phase commonly indicates a feature that affects use or management.For example,Alpha silt loam,0 to 2 percent slopes,is a phase of the Alpha series. � Some map units are made up of two or more major soils or miscellaneous areas. These map units are complexes,associations,or undifferentiated groups. A complex consists of two or more soils or miscellaneous areas in such an intricate � pattern or in such small areas that they cannot be shown separately on the maps.The pattern and proportion of the soils or miscellaneous areas are somewhat similar in all areas.Alpha-Beta complex,0 to 6 percent slopes,is an example. An association is made up of two or more geographically associated soils or � miscellaneous areas that are shown as one unit on the maps.Because of present or anticipated uses of the map units in the survey area,it was not considered practical or necessary to map the soils or miscellaneous areas separately.The pattern and relative proportion of the soils or miscellaneous areas are somewhat similar.Alpha- � Beta association,0 to 2 percent slopes,is an example. An undifferentiated group is made up of hvo or more soils or miscellaneous areas that could be mapped individually but are mapped as one unit because similar interpretations can be made for use and management.The pattern and proportion of � the soils or miscellaneous areas in a mapped area are not uniform.An area can be made up of only one of the major soils or miscellaneous areas,or it can be made up of all of them.Alpha and Beta soils,0 to 2 percent slopes,is an example. Some surveys include miscellaneous areas.Such areas have little or no soil material and support little or no vegetation.Rock outcrop is an example. 1� � � ' 11 � ' i ! 1 1 � Custom Soil Resource Report � Thurston County Area,Washington 110—Spanaway gravelly sandy loam,0 to 3 percent slopes � Map Unit Setting National map unit symbol: 2ndb6 Mean annual precipitation: 35 to 65 inches � Mean annual air temperature: 50 degrees F Frost-free period: 150 to 200 days Farmland classification: Prime farmland if irrigated Map Unit Composition � Spanaway and similar soiLs: 100 percent Estimates are based on observations,descriptions,and transects ofthe mapunit. Description of Spanaway Setting Landform: Terraces,outwash plains �1 Parent material: Volcanic ash over gravelly outwash Typical profile Hl -0 to 15 inches: gravelly sandy loam � H2-15 to 20 inches: very gravelly loam H3-20 to 60 inches: extremely gravelly sand Properties and qualities S lope: 0 to 3 percent � Depth to restrictive feature: More than 80 inches Natural drainage class: Somewhat excessively drained Capacity ofthe most limiting layer to transmit water(Ksat): High(1.98 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency offlooding: None Frequency ofponding: None Available water storage in profile: Low(about 3.8 inches) Interpretive groups Land capability classi5cation(nrigated): 3s � Land capability classification(nonirrigated): 3s Hydrologic SodGroup: A Othervegetativeclassification: DroughtySoils(G002XS401WA) YM 111--Spanaway gravelly sandy loam,3 to 15 percent slopes � Map Unit Setting National map unit symbol 2ndb7 Mean annual precipitation: 35 to 65 inches Mean annual air temperature: 50 degrees F Frost-free period: 150 to 200 days Farmland classification: Farmland of statewide importance � 12 ' 1 � ' ' ' � Custom Soil Resource Report Map Unit Composition ,� Spanaway and simdar soiLs: 100 percent Estimates are based on observations,descriptions,and transects ofthe mapunit. Description of Spanaway � Setting Landform: Outwash plains,terraces Parent material: Volcanic ash over gravelly outwash � Typical profile HI -0 to 15 inches: gravelly sandy loam H2-15 to 20 inches: very gravelly sandy loam H3-20 to 60 inches: extremely gravelly sand Properties and qualities Slope: 3 to 15 percent � Depth[o restrictive feature: More than 80 Inches Naturaldrainageclass: Somewhatexcessivelydrained � Capacity ofthe most limiting layer to transmit water(Ksat): High(1.98 to 5.95 in/hr) Depth to water table: More than 80 inches Frequency offlooding: None Frequency ofponding: Nane Available water storage in profile: Low(about 3.8 inches) � Interpretive groups Land capability classification(irrigated): 4s Land capability classification(nonirrigated): 4s HydrologicSo�7Group: A � Othervegetative classiScation: Droughty Soils(G002XS401WA) . ' ' t ' ' 1 13 � ' 1 ' 1 ' ' / ' � �- References � American Association of State Highway and Transportation O�cials(AASHTO).2004. Standard specifications for transportation materials and methods of sampling and � testing.24th edition. American Society for Testing and Materials(ASTM).2005.Standard classification of soiis for engineering purposes.ASTM Standard D2487-00. Cowardin,L.M.,V.Carter,F.C.Golet,and E.T.LaRoe.1979.Classification of � wetlands and deep-water habitats of the United States.U.S.Fish and Wildlife Service FWS/OBS-79/31. Federal Register.July 13,1994.Changes in hydric soils of the United States. Federal Register.September 18,2002.Hydric soils of the United States. � Hurt,G.W.,and L.M.Vasilas,editors.Version 6.0,2006.Field indicators of hydricsoils in the United States. National Research Council.1995.Wetlands:Characteristics and boundaries. � Soil Survey Division Staff.1993.Soil survey manual.Soil Conservation Service.U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/nres/ detai I/nationa I/soi Is/?cid=nres 142p2_054262 Soil Survey Staff.1999.Soil taxonomy:A basic system of soil classification for making � and interpreting soil surveys.2nd edition.Natural Resources Conservation Service, U.S.DepartmentofAgricultureHandbook436. http:/(www.nres.usda.gov/wps/portai/ n res/d eta il/national/soils/?cid=nres 142p2_053577 Soil Survey Staff.2010.Keys to soil taxonomy.11th edition.U.S.Department of � Agriculture,Natural Resources Conservation Service. http:!lww�,v.nres.usda.gov/wps/ po rtal/nres/detail/national/soi Is/?cid=nres 142p2_053580 Tiner,R.W.,Jr.1985.Wetlands of Delaware.U.S.Fish and Wildlife Service and Delaware Department of Natural Resources and Environmental Control,Wetlands Section. � United States Army Corps of Engineers,Environmental Laboratory.1987.Corps of Engineers wetlands delineation manual.Waterways Experiment Station Technical Report Y-87-1. � United States Department of Agriculture,Natural Resources Conservation Service. National forestry manual. http://www.nres.usda.gov/wps/portal/nresldetail/soils/ ho me/?cid=nres 142p2_053374 United States Department of Agriculture,Natural Resources Conservation Service. National range and pasture handbook.http://www.nres.usda.gov/wps/portal/nres/ detail/national/landuselrangepasture/?cid=stelprdb 1043084 �* 14 , ' ' � ' *� Custom Soil Resource Report United States Department of Agriculture,Natural Resources Conservation Service. National soil survey handbook,title 430-VI. http://www.nres.usda.gov/wps/portal/ � nres/detail/soils/scientists/?cid=nres 142p2_054242 United States Department of Agriculture,Natural Resources Conservation Service. � 2006.Land resource regions and major land resource areas of the United States,the Caribbean,and the Pacific Basin.U.S.Department of Agriculture Handbook 296. http://www.n res.usda.govlwps/porta I(n res/detail/n ationa I/soils/? cid=nres 142p2_053624 United States Department of Agriculture,Soil Conservation Service.1961.Land � capability classification.U.S.Department of Agriculture Handbook 210. http:// 4wwv.nres.usda.govll nternet/FS E_DOCUM ENTS/nres 142 p2_052290.pdf � ' ' ' � ' ' ' ' 15 � ' ' ' ' ' ' ' ' ' ' � APPENDIX B — Drainage Maps � 1 1 1 1 1 � ' 1 1 1 � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE B-1 � , . 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O � �r..y' '.,.av. ��e'��1 i+.t�.•: \��I \ . �.e � . . . .I � � � ! •,ll'6tF 3. lr$�00 N • . . i"�� , � � � � � � � Q � � � � � � � � � � � 'F ,..'`� 1 ' � � � , � APPENDIX C — Drainage Calculations � - 1 1 � � 1 f �. . 1 f � � � 4� � FOOD DISTRIBUTION WAREHOUSE 10.20.2014 PAGE C-1 � ' ' � North Pond SF ac landscape 13,177 0.30 � Roof 26,408 0.61 asphalt 22,126 0.51 Walk 2,777 0.06 � pond 9,571 0.22 1,70 South Pond landscape 4,487 0.10 "� Roof 0 0.00 asphalt 32,578 0.75 � Walk 0 0.00 pond 6,638 0.15 1.00 '�1 � ' ' ' . � ' ' � � ' ' ' �, �. r--I � � � O \ � � � O � � i � � � -� - o � J � < _ a 4 � Q > � O � � � �- O OJ � a �7 z m B ° � � W a � o� ] ar �r � � � � B � 1 0 �. =m oc a h ¢� � � O �� O m -- a� m z s � Q N Q Y \W V O Q B / � � CCL'Z NIbANSaNVI I O � � � � 0 a a I U M o� � � Z� � s� oQ / O]N O i °o � � m m � � � � � � � w � WWHM2012 � PROJECT REPORT � Project Name: South portion Site Name: FOOD DISTRIBUTION WAREHOUSE Site Address: South Pond � City . Report Date: 10/17/2014 Gage : Lake Lawrence Data Start : 1955/10/O1 Data End : 2008/09/30 � Precip Scale: 0.86 Version : 2013/06/26 � Low Flow Threshold for POC 1 : 50 Percent of the 2 Year � � High Flow Threshold for POC 1: 50 year �- � PREDEVELOPED LAND USE Name : Basin 1 � Bypass: No GroundWater: No � Pervious Land Use Acres A B, Forest, Flat 1 Pervious Total 1 � Impervious Land Use Acres � Impervious Total 0 Basin Total 1 � Element Flows To: � Surface Interflow Groundwater � MITIGATED LAND USE � Name : Basin 1 Bypass: No � GroundWater: No Pervious Land Use Acres � �Y � � , � A B, Lawn, Flat .1 � Pervious Total 0.1 Impervious Land Use Acres PARKING FLAT 0.75 � POND 0.15 Impervious Total 0.9 � Basin Total 1 � � Element Flows To: � Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 � Name : Trapezoidal Pond 1 Bottom Length: 91.00 ft. Bottom Width: 10.00 ft. � Depth: 5 ft. Volume at riser head: 0.2175 acre-ft. Infiltration On Infiltration rate: 10 � Infiltration safety factor: 1 Side slope 1: 3 To 1 t� Side slope 2: 3 To 1 � Side slope 3: 3 To 1 Side slope 4: 3 To 1 Discharge Structure Riser Height: 4 ft. � Riser Diameter: 12 in. �� Fslement Flows To: Outlet 1 Outlet 2 � Pond Hydraulic Table Stage(ft) Area(ac) Volume(ac-ft) Discharge(cfs) Infilt(cfs) � 0. 0000 0.020 0.000 0.000 0.000 0.0556 0.021 0.001 0.000 0.210 0.1111 0.022 0.002 0.000 0.210 � 0.1667 0.023 0.003 0.000 0.210 0.2222 0.024 0.005 0.000 0.210 0.2778 0.024 0.006 0.000 0.210 � 0.3333 0.025 0.007 0.000 0.210 0.3889 0.026 0. 009 0.000 0.210 0.4444 0.027 0.010 0.000 0.210 0.5000 0.028 0. 012 0.000 0.210 � 0.5556 0. 028 0.013 0.000 0.210 ' ' 0.6111 0. 029 0.015 0.000 0.210 � 0.6667 0.030 0. 017 0.000 0.210 0.7222 0.031 0.018 0.000 0.210 � 0.7778 0.032 0.020 0. 000 0.210 0.8333 0.033 0.022 0.000 0.210 0.8889 0.033 0.024 0.000 0.210 � 0. 9444 0.034 0. 026 0.000 0.210 1. 0000 0.035 0.028 0. 000 0.210 1.0556 0.036 0.030 0.000 0.210 l.11ll 0.037 0.032 0.000 0.210 1.1667 0. 038 0.034 0.000 0.210 1.2222 0. 039 0.036 0. 000 0.210 � � 1.2778 0.040 0.038 0.000 0.210 1.3333 0.040 0.040 0.000 0.210 � 1.3889 0.041 0.043 0.000 0.210 1.4444 0.042 0.045 0.000 0.210 1.5000 0. 043 0.047 0. 000 0.210 � 1.5556 0.044 0.050 0.000 0.210 1.6111 0.045 0.052 0.000 0.210 1.6667 0.046 0.055 0.000 0.210 1.7222 0.047 0.058 0.000 0.210 � 1.7778 0.048 0.060 0.000 0.210 1.8333 0. 049 0.063 0.000 0.210 1.8889 0. 050 0.066 0.000 0.210 � 1.9444 0. 051 0.068 0.000 0.210 2.0000 0.052 0.071 0. 000 0.210 2 .0556 0.053 0.074 0.000 0.210 2 .1111 0.053 0.077 0.000 0.210 2 .1667 0.054 0.080 0.000 0.210 � 2 .2222 0.055 0.083 0.000 0.210 2 .2778 0. 056 0.086 0.000 0.210 2 .3333 0.057 0.090 0.000 0.210 � 2 .3889 0.058 0.093 0.000 0.210 2.4444 0.059 0.096 0.000 0.210 2.5000 0.060 0.100 0.000 0.210 � 2 .5556 0.061 0.103 0.000 0.210 2 .6111 0. 062 0.106 0.000 0.210 2.6667 0.063 0.110 0.000 0.210 2.7222 0.064 0.114 0.000 0.210 2 .7778 0. 065 0.117 0.000 0.210 � 2 .8333 0.066 0.121 0.000 0.210 2 .8889 0.068 0.125 0.000 0.210 � 2 . 9444 0. 069 0.128 0. 000 0.210 3 . 0000 0.070 0.132 0.000 0.210 3.0556 0.071 0.136 0.000 0.210 3.1111 0.072 0.140 0.000 0.210 � 3.1667 0.073 0.144 0.000 0.210 3.2222 0.074 0.148 0.000 0.210 3 .2778 0.075 0.152 0.000 0.210 3 .3333 0.076 0.157 0.000 0.210 3 .3889 0.077 0.161 0.000 0.210 �+W 3.4444 0.078 0.165 0. 000 0.210 3.5000 0.079 0.170 0.000 0.210 � 3 .5556 0. 080 0.174 0.000 0.210 3 .6111 0.081 0.179 0.000 0.210 3 .6667 0.083 0.183 0.000 0.210 3.7222 0.084 0.188 0.000 0.210 � � � � ' �p 3.7778 0.085 0.193 0.000 0.210 3.8333 0.086 0.197 0. 000 0.210 � 3 .8889 0.087 0.202 0. 000 0.210 3.9444 0.088 0.207 0.000 0.210 4.0000 0.089 0.212 0.000 0.210 4.0556 0.090 0.217 0.127 0.210 � 4.1111 0.092 0.222 0.360 0.210 4.1667 0.093 0.227 0.662 0.210 4.2222 0.094 0.232 1. 020 0.210 4.2778 0.095 0.238 1.425 0.210 �^ 4.3333 0.096 0.243 1.874 0.210 4.3889 0.097 0.249 2.361 0.210 4.4444 0.099 0.254 2 .885 0.210 � 4.5000 0.100 0.260 3.443 0.210 4.5556 0.101 0.265 4.032 0.210 4.6111 0.102 0.271 4.652 0.210 � 4.6667 0.103 0.277 5.301 0.210 4.7222 0.105 0.282 5.977 0.210 4.7778 0.106 0.288 6.680 0.210 4.8333 0.107 0.294 7.408 0.210 � 4.8889 0.108 0.300 8.161 0.210 4.9444 0.109 0.306 8. 938 0.210 5.0000 0.111 0.312 9.739 0.210 5.0556 0.112 0.319 10.56 0.210 � � ANALYSIS RESULTS Stream Protection Duration � � Predeveloped Landuse Totals for POC #1 Total Pervious Area:l Total Impervious Area:O � Mitigated Landuse Totals for POC #1 Total Pervious Area:O.l Total Impervious Area:0.9 � Flow Frequency Return Periods for Predeveloped. POC #1 � Return Period Flow(cfs) 2 year 0.001517 5 year 0.004209 10 year 0.00776 �" 25 year 0.015847 ��, 50 year 0.026021 100 year 0.041623 � Flow Frequency Return Periods for Mitigated. POC #1 Return Period F1ow(cfs) 2 year 0 • � 5 year 0 , ' 10 year 0 � 25 year 0 50 year 0 � 100 year 0 Stream Protection Duration � Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.005 0.000 1957 0.001 0.000 � 1958 0.001 0. 000 � 1959 0. 001 0. 000 , 1960 0.001 0.000 � 1961 0.004 0. 000 1962 0.001 0.000 1963 0.001 0. 000 � 1964 0.001 0.000 1965 0. 001 0.000 1966 0.001 0.000 1967 0.001 0. 000 � 1968 0.001 0.000 1969 0.001 0.000 1970 0.001 0. 000 1971 0.007 0. 000 � 1972 0.011 0.000 1973 0.001 0.000 1974 0.003 0.000 � 1975 0.001 0. 000 1976 0.001 0. 000 1977 0.001 0.000 1978 0.001 0.000 � 1979 0.001 0.000 1980 0.001 0. 000 1981 0.002 0. 000 � 1982 0.002 0.000 1983 0.001 0.000 1984 0.001 0. 000 1985 0.001 0. 000 1986 0.002 0.000 � 1987 0.002 0.000 1988 0.001 0. 000 � 1989 0.001 0. 000 1990 0.006 0.000 1991 0.009 0.000 1992 0.001 0. 000 � 1993 0.001 0.000 1994 0.001 0.000 1995 0.005 0.000 1996 0. 012 0. 000 1997 0.008 0.000 ,ili 1998 0.002 0.000 1999 0.001 0.000 � 2000 0.001 0. 000 2001 0.001 0.000 2002 0.005 0.000 2003 0.001 0. 000 � �r � � � ' � � 2004 0.051 0.000 2005 0.008 0.000 � 2006 0. 036 0.000 2007 0.016 0.000 2008 0.001 0.000 � Stream Protection Duration Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated � 1 0.0506 0.0000 2 0.0364 0.0000 3 0.0157 0.0000 � 4 0.0121 0.0000 5 0.0106 0.0000 6 0.0086 0.0000 7 0.0082 0.0000 �+ 8 0.0080 0.0000 9 0.0065 0.0000 � 10 0.0057 0.0000 11 0.0051 0.0000 �„ 12 0.0050 0.0000 13 0.0050 0.0000 14 0:0036 0.0000 � 15 0.0028 0.0000 16 0.0021 0.0000 17 0.0019 0.0000 � 18 0.0019 0.0000 19 0.0019 0.0000 20 0.0017 0.0000 21 0.0013 0.0000 � 22 0.0011 0.0000 23 0.0011 0.0000 24 0.0011 0.0000 � 25 0.0008 0.0000 26 0. 0008 0.0000 27 0.0008 0.0000 28 0.0008 0.0000 � 29 0.0008 0.0000 30 0.0008 0.0000 31 0.0008 0.0000 � 32 0.0008 0.0000 33 0.0008 0.0000 34 0.0008 0.0000 35 0.0008 0.0000 � 36 0.0008 0.0000 37 0.0008 0.0000 38 0.0008 0.0000 39 0.0008 0.0000 � 40 0.0008 0.0000 41 0.0008 0.0000 42 0.0008 0.0000 � 43 0.0008 0.0000 44 0.0008 0.0000 45 0.0008 0.0000 46 0.0008 0.0000 � 47 0.0008 0.0000 ' � , 48 0. 0008 0.0000 � 49 0. 0008 0. 0000 50 0.0008 0.0000 � 51 0.0008 0. 0000 52 0. 0007 0. 0000 53 0.0007 0.0000 � Stream Protection Duration POC #1 The Facility PASSED � The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail � 0. 0008 689 0 0 Pass 0.0010 148 0 0 Pass � 0.0013 120 0 0 Pass 0. 0015 98 0 0 Pass 0.0018 80 0 0 Pass 0.0020 61 0 0 Pass � 0.0023 51 0 0 Pass 0.0025 48 0 0 Pass 0. 0028 44 0 0 Pass 0.0031 38 0 0 Pass � 0.0033 37 0 0 Pass 0.0036 33 0 0 Pass 0.0038 32 0 0 Pass 0. 0041 30 0 0 Pass � 0. 0043 29 0 0 Pass 0.0046 27 0 0 Pass ' 0.0048 26 0 0 Pass � 0.0051 22 0 0 Pass 0. 0054 19 0 0 Pass 0.0056 18 0 0 Pass � 0. 0059 16 0 0 Pass 0.0061 16 0 0 Pass 0.0064 14 0 0 Pass 0.0066 13 0 0 Pass 0. 0069 11 0 0 Pass � 0. 0071 9 0 0 Pass 0.0074 9 0 0 Pass 0.0076 9 0 0 Pass � 0.0079 9 0 0 Pass 0.0082 8 0 0 Pass - 0. 0084 6 0 0 Pass � 0. 0087 5 0 0 Pass 0.0089 5 0 � Pass 0.0092 5 0 0 Pass 0.0094 5 0 0 Pass 0.0097 5 0 0 Pass ,� 0.0099 5 0 0 Pass 0.0102 5 0 0 Pass � 0.0105 5 0 0 Pass 0. 0107 4 0 0 Pass 0.0110 4 0 0 Pass 0.0112 4 0 0 Pass � ' _ ' � 0.0115 4 0 0 Pass 0.0117 4 0 0 Pass � 0.0120 4 0 0 Pass 0.0122 3 0 0 Pass 0.0125 3 0 0 Pass 0.0128 3 0 0 Pass � 0.0130 3 0 0 Pass 0.0133 3 0 0 Pass 0.0135 3 0 0 Pass 0. 0138 3 0 0 Pass � 0.0140 3 0 0 Pass 0.0143 3 0 0 Pass 0.0145 3 0 0 Pass � 0.0148 3 0 0 Pass 0.0150 3 0 0 Pass 0.0153 3 0 0 Pass 0.0156 3 0 0 Pass � 0.0158 2 0 0 Pass 0:0161 2 0 0 Pass 0.0163 2 0 0 Pass 0.0166 2 0 0 Pass 0.0168 2 0 0 Pass 0.0171 2 0 0 Pass � 0.0173 2 0 0 Pass 0.0176 2 0 0 Pass 0.0179 2 0 0 Pass 0.0181 2 0 0 Pass 0.0184 2 0 0 Pass � 0.0186 2 0 0 Pass �� 0.0189 2 0 0 Pass 0.0191 2 0 0 Pass � 0.0194 2 0 0 Pass 0.0196 2 0 0 Pass 0.0199 2 0 0 Pass � 0.0202 2 0 0 Pass 0.0204 2 0 0 Pass 0.0207 2 0 0 Pass 0.0209 2 0 0 Pass � 0.0212 2 0 0 Pass 0.0214 2 0 0 Pass 0.0217 2 0 0 Pass 0.0219 2 0 0 Pass � 0.0222 2 0 0 Pass 0.0224 2 0 0 Pass 0.0227 2 0 0 Pass 0.0230 2 0 0 Pass � 0.0232 2 0 0 Pass 0.0235 2 0 0 Pass 0.0237 2 0 0 Pass � 0.0240 2 0 0 Pass 0.0242 2 0 0 Pass 0.0245 2 0 0 Pass � 0.0247 2 0 0 Pass 0.0250 2 0 0 Pass 0.0253 2 0 0 Pass 0.0255 2 0 0 Pass 0.0258 2 0 0 Pass � � 0. 0260 2 0 0 Pass � � Water Quality BMP Flow and Volume for POC #1 On-line facility volume: 0.1307 acre-feet On-line facility target flow: 0.1561 cfs. � Adjusted for 15 min: 0.1561 cfs. Off-line facility target flow: 0.0885 cfs. Adjusted for 15 min: 0.0885 cfs. Perind and Impind Changes � No changes have been made. � This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assumed � by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business ' interruption, and the like) arising out of the use of, or inability to use this program � even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright � by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. � ' ' ' � � , , ' ' � 1 � � - _ __._ _.,_,__- __ - -- _ . _ _ _ . �7:s Trapezoidal Pond 1 Mitigated Q r Facili#y Name Trapezoidal Pond 1 Facility Type Trapezoidal Pond Yp Outlet 1 Ou#let 2 Outlet 3 Qownstream Connections 0 0 0 � � Precipitation Applied to Facility Auto Pond I QuiCk Pond _ _( ___ _ ___- ....................................................................- r ,EvaporationAppliedto.Facilit� Faciliiy_D�mension Diagram__ Facility Dimensions Outlet_Struc#ure Data ._) � Facility Bottom Elevation(ft] � Riser Height(ftJ �—� Bottom Length(ftJ g7 � -�,� � Riser Diamater(in] yz - Botkom Width(ftJ 10 Riser Type Flak � � Effective Depth(ftJ � Notch Type Left Side Slope(HNJ � �^ Bokkom Side Slope[HNJ 3� � Right Side Slope(HN] L--I {r Top Side Slope(HNJ 0 Orifice Diameter Height � Infiltration YES � Number (in) (ft) Measured Infiltration Rate[inlhrJ 70 =� y ��"-"� "�::J -- FieductionFackor(infilt"factorJ �� 2 r""�`J �—�J � ___ UseWettedSurfaceArea(sidewalls) Np � 3 ��,=-� �� Total Volume Infiltrated(ac-ft] 157.999 � Total Volume Through Riser[ac-ftj 0 Pond Volume at Riser Head(ac-ftJ .218 Total Volume Thraugh Facility(ac-ftJ 158.�0 Show Pond Table Open Table -:� Percent Infiltrated 100 Initial Stage(ft} � Size Infil#ration Pond _ _- ---- --------� Target%: 100 � � Tide Gate Time Seriesj Demand �_.__s�.____._!._ � ____ ___ -- __.. _._ - -._, ---- __._._._. �-Determine Outlet With Tide Gate - - - -— - --- -- - - - ------ --- - � � r Use Tide Gate � � Tide Gate Elevation(ft} �— Downstream Connection � . � j Overflow Elevation(ft) �-- Iteratians 0 � � __ ��---.__. ___ _ _. ..._ _ .___.. _--.______,._ __ ___-- - ---_.._._ .._. ___.__ ' ' 1 ' ' ' 1 1 ' ' ' ' ' ' ' ' ' 1 ' ' ' ' ' ' , ' � WWHM2012 PROJECT REPORT � Pro 'ect Name: North ortion 7 P Site Name: Site Address: � City . Report Date: 10/17/2014 Gage : Lake Lawrence Data Start : 1955/10/O1 Data End : 2008/09/30 Precip Scale: 0.86 � Version : 2013/06/26 Low Flow Threshold for POC 1 : 50 Percent of the 2 Year � High Flow Threshold for POC 1: 50 year � PREDEVELOPED LAND USE � Name : Basin 1 Bypass: No � GroundWater: No _ Pervious Land Use Acres A B, Forest, Flat 1.7 � Pervious Total 1.7 � Impervious Land Use Acres Impervious Total 0 � Basin Total 1.7 �, Element Flows To: Surface Interflow Groundwater � � MITIGATED LAND USE Name : Basin 1 Bypass: No � GroundWater: No � Pervious Land Use Acres ' ' A B, T.,awn, Flat .3 � Pervious Total 0.3 � Impervious Land Use Acres ROOF TOPS FLAT 0.61 SIDEWALKS FLAT 0.06 � PARICING FLAT 0.51 POND 0.22 Impervious Total 1.4 � Basin Total 1.7 � Element Flows To: � Surface Interflow Groundwater Trapezoidal Pond 1 Trapezoidal Pond 1 � Name : Trapezoidal Pond 1 Bottom Length: 178.00 ft. � Bottom Width: 10.00 ft. Depth: 5 ft. Volume at riser head: 0.3971 acre-ft. � Infiltration On Infiltration rate: 10 Infiltration safety factor: 1 Side slope 1: 3 To 1 � Side slope 2: 3 To 1 Side slope 3: 3 To 1 Side slope 4: 3 To 1 � Discharge Structure Riser Height: 4 ft. Riser Diameter: 12 in. Element Flows To: � Outlet 1 Outlet 2 � � Pond Hydraulic Table Stage(ft) Area(ac) Volume(ac-ft) Discharge(cfs) Infilt(cfs) 0. 0000 0.040 0.000 0.000 0.000 0. 0556 0.042 0.002 0.000 0.412 0.1111 0.043 0. 004 0.000 0.412 � 0.1667 0.045 0.007 0.000 0.412 0.2222 0.046 0.009 0. 000 0.412 � 0.2778 0.048 0.012 0.000 0.412 0.3333 0.049 0.015 0.000 0.412 0.3889 0.051 0. 017 0. 000 0.412 0.4444 0. 052 0.020 0.000 0.412 � , � ' � 0.5000 0.054 0.023 0.000 0.412 0.5556 0.055 0.026 0.000 0.412 � 0.6111 0.057 0.029 0.000 0.412 0.6667 0.058 0. 033 0. 000 0.412 0.7222 0.060 0.036 0.000 0.412 0.7778 0.061 0.039 0.000 0.412 � 0.8333 0.063 0.043 0.000 0.412 0.8889 0.064 0.046 0.000 0.412 0. 9444 0. 066 0. 050 0.000 0.412 � 1.0000 0.067 0.054 0.000 0.412 1.0556 0.069 0.057 0.000 0.412 1.1111 0.070 0.061 0.000 0.412 1.1667 0.072 0.065 0.000 0.412 1.2222 0.073 0.069 0.000 0.412 1.2778 0.075 0. 073 0. 000 0.412 1.3333 0.076 0. 078 0.000 0.412 � 1.3889 0.078 0.082 0.000 0.412 1.4444 0.080 0.086 0.000 0.412 1.5000 0.081 0.091 0.000 0.412 1.5556 0.083 0. 095 0.000 0.412 � 1.6111 0.084 0.100 0.000 0.412 1.6667 0.086 0.105 0.000 0.412 1.7222 0.087 0.110 0.000 0.412 1.7778 0.089 0.115 0.000 0.412 � 1.8333 0.091 0.120 0.000 0.412 1.8889 0.092 0.125 0.000 0.412 1.9444 0.094 0.130 0.000 0.412 2 . 0000 0.096 0.135 0.000 0.412 � 2.0556 0.097 0.141 0.000 0.412 2.1111 0.099 0.146 0.000 0.412 2 .1667 0.100 0.152 0.000 0.412 � 2.2222 0.102 0.157 0.000 0.412 2 .2778 0.104 0.163 0.000 0.412 2 .3333 0.105 0.169 0.000 0.412 � 2 .3889 0.107 0.175 0.000 0.412 2 .4444 0.109 0.181 0.000 0.412 2 .5000 0.110 0.187 0. 000 0.412 2.5556 0.112 0.193 0. 000 0.412 � 2 .6111 0.114 0.199 0.000 0.412 2 .6667 0.115 0.206 0.000 0.412 2.7222 0.117 0.212 0.000 0.412 2 .7778 0.119 0.219 0.000 0.412 � 2 .8333 0.120 0.226 0. 000 0.412 2 .8889 0.122 0.232 0.000 0.412 2 . 9444 0.124 0.239 0.000 0.412 � 3.0000 0.126 0.246 0.000 0.412 3.0556 0.127 0.253 0.000 0.412 3.1111 0.129 0.260 0.000 0.412 3 .1667 0.131 0.268 0.000 0.412 � 3.2222 0.132 0.275 0.000 0.412 3 .2778 0.134 0.282 0.000 0.412 3 .3333 0.136 0.290 0.000 0.412 � 3.3889 0.138 0.297 0. 000 0.412 3 .4444 0.139 0.305 0.000 0.412 3.5000 0.141 0.313 0.000 0.412 3.5556 0.143 0.321 0.000 0.412 � 3 .6111 0.145 0.329 0.000 0.412 ' ' 3 .6667 0.146 0.337 0.000 0.412 � 3 .7222 0. 148 0.345 0.000 0.412 3.Z778 0.150 0.354 0.000 0.412 � 3.8333 0.152 0.362 0.000 0.412 3 .8889 0.154 0.370 0.000 0.412 3. 9444 0.155 0.379 0. 000 0.412 4.0000 0.157 0.388 0.000 0.412 � 4. 0556 0.159 0.397 0.127 0.412 4.1111 0.161 0.406 0.360 0.412 4.1667 0.163 0.415 0.662 0.412 4.2222 0. 164 0.424 1. 020 0.412 4.2778 0.166 0.433 1.425 0.412 � 4.3333 0.168 0.442 1.874 0.412 4.3889 0.170 0.452 2.361 0.412 � 4.4444 0.172 0.461 2.885 0.412 4.5000 0.174 0.471 3.443 0.412 4.5556 0.176 0.480 4. 032 0.412 � 4.6111 0.177 0.490 4.652 0.412 4.6667 0.179 0.500 5.301 0.412 4.7222 0.181 0.510 5. 977 0.412 4.7778 0.183 0.520 6.680 0.412 � 4.8333 0.185 0.531 7.408 0.412 4.8889 0.187 0.541 8.161 0.412 4. 9444 0.189 0.551 8. 938 0.412 � 5.0000 0.191 0.562 9. 739 0.412 5. 0556 0.192 0.573 10.56 0.412 � ANALYSIS RESULTS Stream Protection Duration ' � Predeveloped Landuse Totals for POC #1 Total Pervious Area:1.7 Total Impervious Area:O � Mitigated Landuse Totals for POC #1 Total Pervious Area:0.3 � Total Impervious Area:1.4 � Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.002579 5 year 0.007156 10 year 0.013192 „� 25 year 0.026941 50 year 0.044236 � 100 year 0.070759 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) '� . � � I ' � 2 year 0 5 year 0 � 10 year 0 25 year 0 50 year 0 100 year 0 � Stream Protection Duration � Annual Peaks for Predeveloped and Mitigated. POC #1 z Year Predeveloped Mitigated 1956 0.008 0.000 1957 0.002 0.000 � 1.958 0.001 0.000 1959 0.001 0.000 1960 0.001 0.000 � 1961 0.006 0.000 1962 0.001 0.000 1963 0.001 0.000 1964 0.001 0.000 � 1965 0.001 0.000 1966 0.001 0.000 1967 0.002 0.000 1968 0.001 0.000 � 1969 0.001 0.000 1970 0.001 0.000 1971 0.011 0.000 1972 0.018 0.000 � 1973 0.001 0.000 1974 0.005 0.000 1975 0.001 0.000 � 1976 0.002 0.000 1977 0.001 0.000 1978 0.002 0.000 � 1979 0.001 0.000 1980 0.001 0.000 1981 0.003 0.000 1982 0.003 0.000 � 1983 0.001 0.000 1984 0.001 0.000 1985 0.001 0.000 1986 0.003 0.000 � 1987 0.003 0.000 1988 0.001 0.000 1989 0.001 0.000 � 1990 0.010 0.000 1991 0.015 0.000 1992 0.001 0.000 1993 0.001 0.000 � 1994 0.001 0.000 1995 0.008 0.000 1996 0.021 0.000 � 1997 0.014 0.000 1998 0.003 0.000 1999 0.001 0.000 2000 0.001 0.000 � 2001 0.001 0.000 ' , 2002 0. 009 0. 000 � 2003 0.001 0.000 2004 0 . 086 0. 000 � 2005 0.014 0.000 2006 0.062 0. 000 2007 0.027 0. 000 2008 0.001 0. 000 � Stream Protection Duration � Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.0861 0. 0000 2 0.0619 0. 0000 � 3 0.0267 0. 0000 4 0.0205 0. 0000 5 0.0180 0. 0000 � 6 0.0147 0. 0000 7 0.0139 0. 0000 8 0. 0136 0.0000 9 0.0111 0.0000 � 10 0. 0097 0. 0000 11 0.0087 0.0000 12 0.0085 0. 0000 � 13 0.0084 0. 0000 14 0.0061 0.0000 15 0.0047 0. 0000 16 0.0035 0.0000 17 0.0032 0. 0000 � 18 0.0032 0.0000 19 0.0032 0. 0000 20 0.0029 0. 0000 � 21 0. 0022 0.0000 22 0.0019 0. 0000 23 0.0019 0. 0000 � 24 0.0019 0. 0000 25 0.0014 0. 0000 26 0.0014 0.0000 27 0.0014 0. 0000 28 0.0014 0. 0000 � 29 0.0014 0.0000 30 0.0014 0. 0000 � 31 0.0014 0.0000 32 0.0014 0. 0000 33 0. 0014 0.0000 34 0.0014 0.0000 � 35 0.0014 0. 0000 36 0.0014 0.0000 37 0.0014 0. 0000 38 0.0014 0.0000 39 0.0014 0.0000 � 40 0.0013 0.0000 41 0.0013 0.0000 � 42 0.0013 0. 0000 43 0.0013 0.0000 44 0.0013 0.0000 45 0.0013 0.0000 � � . � ' �, 46 0.0013 0.0000 47 0.0013 0.0000 � 48 0.0013 0.0000 49 0.0013 0.0000 50 0.0013 0.0000 51 0.0013 0.0000 52 0.0012 0.0000 53 0.0012 0.0000 � Stream Protection Duration POC #1 The Facility PASSED � The Facility PASSED. Flow(cfs) Predev Mit Percentage Pass/Fail � 0.0013 687 0 0 Pass 0.0017 148 0 0 Pass 0.0022 120 0 0 Pass � 0.0026 98 0 0 Pass 0.0030 80 0 0 Pass 0.0035 61 0 0 Pass 0.0039 51 0 0 Pass � 0.0043 48 0 0 Pass 0.0048 44 0 0 Pass 0.0052 38 0 0 Pass 0.0056 37 0 0 Pass � 0.0061 33 0 0 Pass 0.0065 32 0 0 Pass 0.0069 30 0 0 Pass � 0.0074 29 0 0 Pass 0.0078 27 0 0 Pass 0.0082 26 0 0 Pass � 0.0087 22 0 0 Pass 0.0091 19 0 0 Pass 0.0095 18 0 0 Pass 0.010� 16 0 0 Pass � 0.0104 16 0 0 Pass 0.0108 14 0 0 Pass 0.0113 13 0 0 Pass 0.0117 11 0 0 Pass � 0.0121 9 0 0 Pass 0.0126 9 0 0 Pass 0.0130 9 0 0 Pass � 0.0134 9 0 0 Pass 0.0139 8 0 0 Pass 0.0143 6 0 0 Pass 0.0147 5 0 0 Pass � 0.0152 5 0 0 Pass 0.0156 5 0 0 Pass 0.0160 5 0 0 Pass �" 0.0165 5 0 0 Pass � 0.0169 5 0 0 Pass 0.0173 5 0 0 Pass 0.0178 5 0 0 Pass � 0.0182 4 0 0 Pass , , 0.0186 4 0 0 Pass � 0.0191 4 0 0 Pass 0. 0195 4 0 0 Pass � 0. 0199 4 0 0 Pass 0.0204 4 0 0 Pass 0.0208 3 0 0 Pass 0. 0212 3 0 0 Pass � 0.0217 3 0 0 Pass 0.0221 3 0 0 Pass 0.0225 3 0 0 Pass 0.0230 3 0 0 Pass 0. 0234 3 0 0 Pass � 0.0238 3 0 0 Pass 0.0243 3 0 0 Pass � 0. 0247 3 0 0 Pass 0.0251 3 0 0 Pass 0.0256 3 0 0 Pass 0. 0260 3 0 0 Pass � 0. 0265 3 0 0 Pass 0.0269 2 0 0 Pass 0.0273 2 0 0 Pass 0.0278 2 0 0 Pass 0. 0282 2 0 0 Pass � 0.0286 2 0 0 Pass 0.0291 2 0 0 Pass � 0.0295 2 0 0 Pass 0.0299 2 0 0 Pass 0. 0304 2 0 0 Pass � 0. 0308 2 0 0 Pass 0.0312 2 0 0 Pass 0. 0317 2 0 0 Pass 0.0321 2 0 0 Pass � 0. 0325 2 0 0 Pass 0.0330 2 0 0 Pass 0.0334 2 0 0 Pass � 0. 0338 2 0 0 Pass 0. 0343 2 0 0 Pass 0. 0347 2 0 0 Pass 0.0351 2 0 0 Pass � 0.0356 2 0 0 Pass 0.0360 2 0 0 Pass 0. 0364 2 0 0 Pass 0. 0369 2 0 0 Pass � 0.0373 2 0 0 Pass 0. 0377 2 0 0 Pass 0. 0382 2 0 0 Pass � 0. 0386 2 0 0 Pass 0. 0390 2 0 0 Pass 0.0395 2 0 0 Pass 0. 0399 2 0 0 Pass 0. 0403 2 0 0 Pass � 0.0408 2 0 0 Pass 0.0412 2 0 0 Pass � 0. 0416 2 0 0 Pass 0.0421 2 0 0 Pass 0.0425 2 0 0 Pass 0.0429 2 0 0 Pass � ' ' � 0.0434 2 0 0 Pass 0.0438 2 0 0 Pass � 0.0442 2 0 0 Pass � Water Quality BMP Flow and Volume for POC #1 On-line facility volume: 0.2035 acre-feet On-line facility target flow: 0.2434 cfs. � Adjusted for 15 min: 0.2434 cfs. Off-line facility target flow: 0.1379 cfs. Adjusted for 15 min: 0.1379 cfs. Perind and Impind Changes No changes have been made. � This program and accompanying documentation are provided 'as-is' without warranty of any kind. The entire risk regarding the performance and results of this program is assuined by End User. Clear Creek Solutions Inc. and the governmental licensee or sublicensees � disclaim all warranties, either expressed or implied, including but not limited to implied warranties of program and accompanying documentation. In no event shall Clear Creek Solutions Inc. be liable for any damages whatsoever (including without limitation to damages for loss of business profits, loss of business information, business � interruption, and the like) arising out of the use of, or inability to use this program even if Clear Creek Solutions Inc. or their authorized representatives have been advised of the possibility of such damages. Software Copyright � by : Clear Creek Solutions, Inc. 2005-2013; All Rights Reserved. � ' ' ' ' ' , ' t ' ' , ' ' � ' i 1 1 1 1 1 i 1 1 1 1 1 1 1 ' � �,a Trapezoida4 PQnd 1 Mitigated O, r F�cility Name Trapezoidal Pond 1 Facilit�,+Type Trapezaidal Pond I tlutle#1 Outlet 2 Dutlet 3 YP �—� �� Qownstream Connections 0 0 0 f PrecipitationApplied to Faciliky Auto Pond � Quick Pond I ' � __ _ _ --------- .............................. ....................................... . .. _ � EvaporationAppliedto.Facilit� Faali#y Dimension Diagr$m Facili Dimensions � Ou#let Struc#ure D_eta__� � Facility Bottom Elevation[ftJ p� Riser Height[ftJ q � Bottam Length[ftJ 7 7$ � * � � Riser Diameter(inJ 72 � ! Bottom 1+didth(fkJ 10 Piser Type Flat I Effective Depth(ft) � �� Notch Type Left Sida Slape[HNj � Bottom Side Slope(HNJ � i � Right Side Slope[HNj � Top Side Slope(HNJ 0 Drifice Diameter Height � ; P Infiltration YES : ,� Number (in) �(ft) �; � � Measured Infiltration Fiate[infhr) 7p -� 1 !�°,�-..� �—,.,:J ReductianFactor(infilt"factarJ �—� 2 �,� �--9--� � UseVJettedSurfaceArea(sidewalls) Mp � 3 �"p`""'°� �.� Total Volume Infiltrated(ac-ft) 245.996 � x, Tatal Volume Through Riser(ac-ftj 0 Pand Volume at Riser Head[ac-ftJ .397 I Total Volume Through Facility(ao-ft] 246.00 Shnv�r Pond Ta61e �pen Table � iw ' Percent Infiltraked 1�0 Initial Stage(ft) , - . . f Siae Infiltration Pand _� �° Target%• 100 � t " Tide G�xte ' Time Series � Demand , _ __ _ _ __ � � -De#ermine Outlet With Tide Gate — - — �, i� Use Tide Gate . - __ -- � Tide Gate Ele�ation(ft) �— Downstream Connection � Overflow Ele�ation (ft) �— Iterations 0 �� - � --_ ___ ._ _. _-------------- ' ' ' ' � � , , , � � ' i 1 1 1 1 i 1 1 1 1 1 �