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2020.0028 Preliminary approval 2020.0341.PR0011 Mountain Meadows Subdivision The City of Yelm is an equal opportunity employer and provider NOTICE OF DECISION DATE: January 11, 2021 PROJECT NAME: Mountain Meadows Administrative Subdivision PROJECT LOCATION: 8818 Burnett Road SE, Yelm, WA PARCEL NUMBERS: 21713310400, 21713310401, 2171310402 CASE NUMBER: 2020.0341.PR0011 NOTICE IS HEREBY GIVEN that the Community Development Department issued an Administrative Subdivision Approval to Henrietta Morey at the above referenced location. The complete decision may be viewed on the City’s website at www.yelmwa.gov and choosing ‘I Want To’ then ‘View’ then ‘Public Notices’ from the menu system. A copy of the decision may also be obtained at the Community Development Department in City Hall at 106 2nd Street SE, Yelm, WA 98597 during normal business hours for a fee of 15 cents per page. For additional information, please contact the Community Development Department at (360) 458-3835. The City of Yelm is an equal opportunity employer and provider ADMINISTRATIVE SUBDIVISION 2020. 0341.PR0011 FINDINGS OF FACT, CONCLUSIONS OF LAW, AND DECISION INTRODUCTION Henrietta Morey filed an administrative subdivision application to the City of Yelm to subdivide 4.4 acres into 22 residential parcels located at 8818 Burnett Road SE. The application package includes 4 exhibits, submitted by Henrietta Morey, including application, preliminary development plans, an updated environmental checklist, and a preliminary drainage report. A full list of exhibits is described below. Exhibit A: Preliminary Subdivision Application Exhibit B: Preliminary Subdivision Drawings Exhibit C: Updated SEPA Checklist Exhibit D: No Effect Prairie Gopher Study Exhibit E: Preliminary Drainage Report Exhibit F: Previous Preliminary Subdivision Approval Exhibit G: Boundary Line Adjustment recorded 2017 Exhibit H: Public Comment Having fully considered the record, the Site Plan Review Committee enters the following: 2020.0341.PR0011 Approval Page 3 of 16 The City of Yelm is an equal opportunity employer and provider FINDINGS OF FACT 1. Henrietta Morey proposes to subdivide a 4.4-acre parcel into 22 residential lots located at 8818 Burnett Road SE, identified by Assessor’s Tax Parcel Numbers 21713310400 and 2171310402. 2. The site received preliminary subdivision approval on July 20, 2005, City of Yelm Permit # 20050121. The original subdivision review and approval included 3 parcels, 21713310400, 21713310401, and 2171310402, which includes a parcel improved with a duplex, a parcel with an outbuilding, and an undeveloped parcel. A Mitigated Determination of Nonsignificance (MDNS) for the preliminary subdivision was issued on May 31, 2005 which included the following conditions: 1. The developer shall mitigate transportation impacts based on the new residential P.M. peak hour trips generated by the project. The Transportation Facility Charge (TFC) shall be based on 1.01 new peak hour trips per residential unit. The proponent will be responsible for a TFC of $757.50 per dwelling unit which is payable at time of building permit. Credit should be given for the existing multi- family dwelling. 2. Prior to final subdivision approval, the developer shall complete the following transportation improvements: a. The east half of Burnett Road shall be improved to City Standards for a Neighborhood Collector along the property frontage. b. All interior streets shall be improved to City Standards for a Local Access Residential. c. The interior street shall be connected to the right-of-way provided to the south, with full street improvements completed to 89 th Street. The cost of these improvements shall be the responsibility of the applicant. 3. The driveway entrance to the existing duplex shall be located on the new interior street. 2020.0341.PR0011 Approval Page 4 of 16 The City of Yelm is an equal opportunity employer and provider 4. Temporary erosion control systems to be approved by the City of Yelm. 5. The developer shall provide at least 5% of total acreage as qualified open space. 6. The developer shall enter into an agreement with Yelm Community Schools to mitigate project The original subdivision was not constructed and the preliminary approval expired. The properties also received a Boundary Line Adjustment (BLA) approval in 2017. The BLA subjected the properties to the original mitigating conditions of the 2005 MDNS. The application materials submitted with this application state that the duplex will connect to City water and sewer, as well as decommissioning the onsite systems, however the conceptual site plan depicts that the parcel is not part of this project. The duplex parcel cannot be excluded from this subdivision application as it was reviewed and included as part of the original MDNS and subdivision approval. This is shown in the subsequent BLA. SEPA rules prohibit reviews that divide a project that when reviewed together would not be exempt. [WAC 197-11-060(5)(b)] The property is located on Burnett Road, north of State Route 510. The property is identified by Assessor’s Tax Parcel Numbers 21713310400, 21713310401, 2171310402. The proposal is comprised of 3 parcels, bound on the north and east by vacant land, to the south by a residential subdivision, and to the west by single family residential units located in Thurston County. The properties are currently developed with a duplex, and an older out-building. The proposed site plan does not adequately address existing conditions. 3. The property is zoned Moderate Density Residential (R-6) which is codified at Chapter 18.32 YMC. The R-6 zone in intended for residential development at a density of not less than three and not more than six units per acre. [Section 18.32.040(A) YMC]. The proposed site plan adequately addresses density. 2020.0341.PR0011 Approval Page 5 of 16 The City of Yelm is an equal opportunity employer and provider 4. Henrietta Morey submitted an administrative subdivision application on November 12, 2020, which was determined to be complete on November 24, 2020. The application materials included a preliminary site plan, preliminary drainage report, a no effect prairie gopher study, and an updated environmental checklist. 5. As required by Section 18.10.080, and 18.10.080(E) YMC, the Yelm Community Development Department mailed a Notice of Application to local and state agencies and surrounding property owners on November 24, 2020. Notice was published on the City’s website and published in the Nisqually Valley News on 25, 2020. Additionally, as required by Section 58.17.095 RCW, the property was posted in 5 conspicuous places with notification that no public hearing would be held unless requested. The public comment period ended on December 15, 2020. Comments were received by an adjacent property owner with concerns about safety of pedestrians wishing to access SR510 Yelm Loop walking paths. The project’s impacts do not warrant the extension of the Burnett Road sidewalk to SR 510 Yelm Loop. The request was forwarded to the City of Yelm Public Works Department for consideration of upcoming sidewalk improvement projects. 6. Henrietta Morey submitted an updated environmental checklist that included a no effect prairie gopher study. The 2005 MDNS reflects Transportation Facility Charge fees that were in existence in 2005. Since that time, the impact fees have changed. Review of the updated checklist and supporting documentation show that the only amendment to the original MDNS required is to reflect current transportation facility charges. 2020.0341.PR0011 Approval Page 6 of 16 The City of Yelm is an equal opportunity employer and provider The May 31, 2005 MDNS mitigating condition #1 should be amended to reflect that a “Transportation Facility Charge is due and payable at building permit issuance. This fee is subject to change. The existing duplex is not subject to a transportation facility charge. The May 31, 2005 MDNS is hereby adopted as amended. 7. Chapter 18.16 YMC requires a determination that the infrastructure facilities necessary to serve a proposed development are in place or planned for and properly funded with a reasonable expectation that the facilities will be in place at the time needed to preserve adopted levels of service. Concurrency with sewer infrastructure is met when the project is within an area approved for sewer pursuant to the adopted sewer comprehensive plan for the City and improvements necessary to provide facilities and services are present to meet the needs of the proposed development. The existing duplex is currently served by an onsite sewer system and connection to City sewer service is a condition of approval. Connection of the existing and new construction to the sewer system satisfies concurrency requirements. Concurrency with water infrastructure means the project is within an area approved for municipal water service pursuant to the adopted water comprehensive plan for the City and improvements necessary to provide services are present. Concurrency for subdivisions is met when, at the time of preliminary approval, the planned infrastructure identified in the six-year improvement program and water rights acquisition program of the water system plan are sufficient to provide for the proposed land division. The State Subdivision Act, Chapter 58.17 RCW, requires that the City of Yelm make a written determination that appropriate provisions are made for potable water supplies as part of the preliminary land division process. 2020.0341.PR0011 Approval Page 7 of 16 The City of Yelm is an equal opportunity employer and provider The level of service for water infrastructure is the ability to provide potable water to the consumer for use and fire protection in accordance with adopted health and environmental regulations. [Section 18.16.030 YMC] The City has been planning since 1994 for the acquisition of new water rights, which were approved by the Washington State Department of Ecology in 2010. This approval was appealed and was upheld by the Pollution Control Hearings Board and by Superior Court, but was overturned by the Washington Supreme Court on October 8, 2015. The Washington State Legislature adopted the 2018 Streamflow Restoration Act. The act requires the Washington Department of Ecology to issue new water rights for up to 5 pilot projects in order to monitor and report the effectiveness of out of kind mitigation for new water rights. A preliminary subdivision is valid for 5 years of the date of approval. [Section 58.17.140 RCW]. Once preliminary subdivision approval is granted, civil plans are prepared, approved, and the construction, inspection, and approval of required improvements such as streets, sidewalks, water and sewer mains, and stormwater facilities is completed. A final subdivision is then submitted for approval by the local legislative authority. Only after final subdivision approval can homes be constructed on the new lots and the water demand is seen. The existing duplex is served by an onsite exempt well. Connection to City water service and decommissioning of the exempt well is a condition of approval. Connection of the existing and new construction to the water system satisfies concurrency requirements. Concurrency with transportation infrastructure means that the project completes frontage improvements, makes off-site improvements required for the safe movement of traffic and pedestrians if impacted by traffic from the development, and pays a traffic facilities charge. The parcel fronts Burnett Road SE which is considered a Neighborhood Collector street, and is not constructed to City Standards. Half street improvements to Burnett Road, the construction of internal streets, and payment of Transportation Facilities charges are mitigating conditions of the 2005 MDNS and are conditions of approval. 2020.0341.PR0011 Approval Page 8 of 16 The City of Yelm is an equal opportunity employer and provider Completion of transportation improvements and payment of Transportation Facility Charges satisfies concurrency requirements. Concurrency with school infrastructure means the developer pays a school impact fee at the time of construction. Payment of the School Impact Fee at the time of building permit issuance satisfies concurrency requirements. Concurrency with fire protection means the developer pays a fire impact fee at the time of construction. Payment of the Fire Impact Fee at the time of building permit issuance satisfies concurrency requirements. 8. Title 18 YMC is the Unified Development Code for the City of Yelm and establishes standards for development within the various zoning districts. The subject property is identified by the Zoning Map as being within the Moderate Density Residential zoning district. (R-6). Surrounding properties are vacant or residentially developed. Residential development at a minimum of 3 units per acre, and a maximum of 6 units per acre is allowed in the R-6 zone as a permitted use. [Section 18.32.040 YMC] Setbacks for residential development in the R-6 zone require a 15-foot setback from a local access street, with a minimum driveway approach of 20 feet. Side yard setbacks are 5 feet, and rear yard setbacks are 25 feet. [Section 18.32.040 YMC] Maximum building height is 35 feet. [Section 18.32.040 YMC]. Residential uses require two parking spaces per dwelling unit. [Section 18.54.030(A) YMC]. The conceptual site plan shows conformance with these requirements. 9. Title 18 YMC provides guidance and regulation for site planning during development. Chapter 18.55 establishes landscaping requirements for various types of development. 2020.0341.PR0011 Approval Page 9 of 16 The City of Yelm is an equal opportunity employer and provider Perimeter landscape includes an 8-foot planter area with a combination of evergreen and deciduous trees. For residential development, a solid wood fence is acceptable on side and rear yards. [Section 18.55.020(B) YMC] Streetscape landscaping includes planter strip with ground cover and street trees, and is a required element of the construction of frontage improvements. [Section 18.55.020(C) YMC] Stormwater facility landscaping includes incorporating onsite landscaping. [Section 18.55.020(E) YMC]. A performance assurance device is required for maintenance of the required landscaping until the homeowners’ association becomes responsible for landscape maintenance. [Section 18.55.070(E)] The proposed site plan does not adequately address landscaping requirements. Chapter 18.56 establishes minimum requirements for the provision of recreation and/or preservation of open space. For single-family residential developments, a minimum of 5 percent of the grows area shall be dedicated as open space. [Section 18.56.010(B) YMC]. The parcels total approximately 4.88 acres, which requires 0.24 acres of open space. To qualify as open space, the area should be dedicated as an active recreation park, or other use found by the Site Plan Review Committee to further the purpose of the chapter. The preliminary plans show the underground stormwater tract as open space, but does not show how the space will be improved to meet recreational open space standards. Chapter 18.57 requires the preservation of trees during development. Site plans should provide location of all trees to be retained and removed that exceed 8-inches in diameter. Tree replacement mitigation of 1 to 1 is appropriate for the removal of trees over 8 inches in diameter. The site is mostly void of trees with the exception of several located in the southwestern corner. It is unclear at this time the number of trees that exceed 8 inch diameter. The proposed site plan does not adequately address tree preservation. 2020.0341.PR0011 Approval Page 10 of 16 The City of Yelm is an equal opportunity employer and provider Mailboxes for the site shall be cluster box units (CBU) and placed on site. [Section 18.59.080 YMC] The proposed site plan does not show mailbox type or placement. 10. The Yelm Critical Areas and Resource Lands, Chapter 18.21 YMC provides protection for critical aquifer recharge areas, frequently flooded areas, wetlands, geologically hazardous areas, and fish and wildlife habitat conservation areas. All of Yelm is identified as a critical aquifer recharge area. Compliance with Federal, State, and County water source protection regulations and with the City’s adopted stormwater regulations is required to protect the aquifer. [Section 18.21.070 (C) YMC] The Mazama Pocket Gopher has been listed as a threatened species by the Washington Department of Fish and Wildlife since at least 2008. Yelm has protected this species through the implementation of the Critical Areas Code. When a development occurs on property suspected to be occupied by the Mazama Pocket Gopher, the Community Development Department has required the applicant prepare a critical areas report which would include mitigation measures if it was determined that pocket gophers would be impacted by the proposed development. The Washington Department of Fish and Wildlife is provided with notice of all threshold determinations issued pursuant to the State Environmental Policy Act and the City consults with the Department when a critical areas report is required. In April 2014, the U.S. Fish and Wildlife Service listed the Yelm subspecies of the Mazama Pocket Gopher as threatened under the Endangered Species Act. While the City of Yelm is not responsible for implementation or enforcement of the Endangered Species Act, it consults with the Service and provides notice to applicants that the pocket gopher is a federally protected species and a permit from the U.S. Fish and Wildlife Service may be required. A preliminary reconnaissance by Key Environmental Solutions, LLC found no occurrence of Mazama Gopher on the site. 2020.0341.PR0011 Approval Page 11 of 16 The City of Yelm is an equal opportunity employer and provider Compliance with Yelm’s requirements under the Critical Areas Code does not ensure compliance with the provisions of the Endangered Species Act. The applicant should contact the US Fish and Wildlife Service with any questions about compliance with Federal standards for threatened species. 11. Impervious surfaces create stormwater runoff which, when uncontrolled and untreated can create health, safety, and environmental hazards. The City of Yelm has adopted the most current Stormwater Management Manual for Western Washington as issued by the Washington State Department of Ecology, which requires all development to treat and control stormwater on site. The proposal includes runoff treatment by Baysaver Bayfilter cartridges, and storage achieved with Stormtech chambers, which have received a general use level designation for basic treatment by Ecology. The conceptual plan shows a utility easement for stormwater drainage along the southern property line, in location of required rear yard setbacks for lots 15 – 22. The location of the storm drain line within the required rear yard setbacks poses several issues, including access for maintenance, probability of fencing, sheds and other structures constructed over the line, and possible planting of trees and shrubs over the line. This issue should be addressed within the CCR’s for the development, as well as clearly marked and limitations described on the face of the subdivision map. 12. All of Yelm is considered a critical aquifer discharge area. The control and treatment of stormwater is required to protect the critical aquifer. The City has adopted the latest edition of the Stormwater Management Manual for Western Washington (SMMWW) published by the Washington Department of Ecology. [Section Chapter 18.27 YMC]. Approved stormwater management provides protection to the aquifer. 13. 2020.0341.PR0011 Approval Page 12 of 16 The City of Yelm is an equal opportunity employer and provider Chapter 13.04 YMC and Chapter 6 of the Development Guidelines establish requirements for connection to the City’s water system. Water service connections are by a service line and water meter in the public right-of- way. [Section 13.04.110 YMC]. Duplex developments are calculated at 100 percent of an equivalent residential unit (ERU) per unit. [Section 13.04.120 YMC]. There is an existing 10-inch water main located at the southern property line of parcel 21713310400. The main is required to be extended along the property frontage of Burnett Road, including parcel 21713310401. The line shall also be extended in the internal roadways, connecting to the 8 inch main located in 89th Way SE. This main will serve fire hydrants and individual services. The duplexes shall connect to City water service and the existing well decommissioned pursuant to Ecology standards, and any water rights associated with the well dedicated to the City of Yelm. Fire protection to the buildings must be provided per the International Fire Code. The specific requirements for installation of additional fire hydrants will be determined during civil plan review. The International building code (IBC) provides occupancy ratings for different types of uses. The fire coverage system for the proposed use must meet IBC requirements. Identified in the 2002 City of Yelm Water Comprehensive Plan is a requirement to install fire hydrant locks as part of the City’s water conservation and accountability program. 14. Chapter 13.08 YMC and Chapter 7 of the Development Guidelines establish requirements for connection to the City’s sewer system. The property is located in the City of Yelm’s STEP sewer system service area. There is an existing 4-inch sewer main located at the southern property line of parcel 21713310400. The main is required to be extended along the property frontage of Burnett Road, including parcel 21713310401. The line shall also be extended in the internal roadways, connecting to the 2 inch main located in 89th Way SE. 2020.0341.PR0011 Approval Page 13 of 16 The City of Yelm is an equal opportunity employer and provider The duplexes shall be connected to City sewer service, and the onsite septic system abandoned pursuant to Thurston County Health Department standards. 15. Frontage improvements are required as part of development in the City. [Section 18.16.050 YMC] Half street improvements for Burnett Road shall be constructed to a Neighborhood Collector Street standard which requires a 16-foot travel lane, vertical curb, a 7-foot planter strip with street trees 35 feet on center and “No Parking” signs, a 5-foot sidewalk, and street lighting. Streets within the subdivision will be constructed to the local access standard and dedicated to the City upon final subdivision approval. A local access street includes two 11- foot travel lanes, two 7-foot parking lanes, a concrete rolled edge curb and gutter, a 6-foot planter strip with street trees 35 feet on center, a 5-foot sidewalk on one side of the street, and street lighting. Section 18.52.090 YMC requires subdivisions to provide for continuation of streets existing in adjoining subdivisions. The Burnett Estates subdivision to the south provided right-of-way at 89th Way SE for this future connection. The internal street shall connect to the south at 89th Way SE, with full street improvements completing 89th Way to 89th Avenue. Traffic Facilities Charges are payable at building permit issuance. Credit is given for the existing duplex. These improvements are mitigating conditions in the adopted 2005 MDNS. 16. Prior to final subdivision approval application, an addressing map shall be submitted to the City for addressing. A short subdivision name must be reserved with the Thurston County Auditor’s Office prior to final subdivision submittal. 2020.0341.PR0011 Approval Page 14 of 16 The City of Yelm is an equal opportunity employer and provider CONCLUSIONS OF LAW Section 18.14.050 YMC requires written findings prior to a decision on a preliminary subdivision. The applicant has established that the proposed subdivision adequately provides for the public health, safety and general welfare and for such open spaces, drainage ways, streets, sanitary wastes, parks and recreation, schools, sidewalks, and that the public use and interest will be served by the subdivision of the property, if conditioned as recommended in this report. The preliminary subdivision, if conditioned as recommended in this report, is in conformance with the Yelm-Thurston County Joint Comprehensive Plan, the City of Yelm Unified Development Code, and the City of Yelm Development Guidelines. DECISION In accordance with the analysis above, the Site Plan Review Committee issues the following decision: The Administrative Subdivision is hereby approved as proposed, subject to the following conditions: 1. The preliminary subdivision map shall be updated to reflect Parcel A as part of the development proposal to include utilities, frontage improvements, and driveway relocation. 2. The Mitigated Determination of Nonsignificance issued May 31, 2005, with mitigating condition #1 amended to reflect most current Transportation Facility Charges, is hereby referenced and considered conditions of this approval. 3. The internal street shall connect to the south at 89th Way SE, with full street improvements completed from the new internal street connection at 89th Way SE to 89th Avenue SE. 4. Civil plan submission shall include a detailed landscape plan showing how required perimeter, streetscape, and open space landscaping is intended to be met. 5. The detailed landscape plan shall include recreational improvements that meet the qualified uses for opens space such as active recreation or play equipment. 6. The detailed landscape plan shall include a tree preservation plan of trees over 8 inches in diameter that are to be removed, and mitigated at a 1-1 replanting basis. 2020.0341.PR0011 Approval Page 15 of 16 The City of Yelm is an equal opportunity employer and provider 7. At final subdivision, the applicant shall provide a performance assurance device in order to provide for maintenance of the required landscape for this subdivision, until the homeowner’s association becomes responsible for the landscaping maintenance. The performance assurance drive shall be 150 percent of the anticipated cost to maintain the landscaping for three years. 8. Civil plan submission shall include the location of cluster box unit mailboxes. 9. Civil plan submission shall include stormwater facilities designed in accordance with the most current Stormwater Management Manual for Western Washington. Best Management Practices (BMP’s) are required during construction. 10. The stormwater plan shall be submitted with civil engineering plans and shall include an operation and maintenance plan. 11. Storm water treatment facilities shall be located in a separate recorded tract owned and maintained by the homeowner’s association. 12. All roof drain runoff shall be infiltrated on each lot utilizing individual drywells. 13. The stormwater system shall be held in common by the Homeowners Association. The Homeowners Agreement shall include provisions for the assessment of fees against individual lots for the maintenance and repair of the stormwater facilities. 14. The CCR’s and Final Subdivision Maps shall clearly show the stormdrain easements, and any restrictions to development on or over the easement. 15. Each dwelling unit within the subdivision shall connect to the City water system. The connection fee and meter fee will be established at the time of building permit issuance. 16. The existing well serving the duplex shall be decommissioned per Washington State Department of Ecology standards, and the duplex connected to City water service. Any water rights associated with the well shall be dedicated to the City of Yelm. 17. All conditions for cross connection control as required in Section 246-290-490 WAC. 18. The civil engineering plans shall include the location of fire hydrants consistent with the Yelm Development Guidelines and applicable fire codes. The plan shall include fire flow calculations for all existing and proposed hydrants and the installation of hydrant locks on all fire hydrants required and installed as part of development. 19. The applicant shall be responsible for the installation of hydrant locks on all fire hydrants required and installed as part of development. The proponent shall coordinate with the Yelm Public Works Department to purchase and install required hydrant locks. 2020.0341.PR0011 Approval Page 16 of 16 The City of Yelm is an equal opportunity employer and provider 20. Each dwelling within the subdivision shall connect to the City S.T.E.P. sewer system. The connection fee and inspection fee will be established at the time of building permit issuance. 21. The existing septic system serving the duplex shall be abandoned per the Thurston County Department of Health standards, and the duplex connected to City sewer service. 22. Street lighting will be required. Civil plan submittal shall include a lighting design plan for review and approval. 23. Prior to the submission final plat application, the proponent will provide the Community Development Department an addressing map for approval. 24. Prior to final plat application, a subdivision name must be reserved with the Thurston County Auditor’s Office. Dated this 11th day of January, 2021 Grant Beck, Derek McCoy, Civil Engineer Community Development Director for Cody Colt, Public Works Director Prepared this 11th day of January, 2021 _________________________ Tami Merriman, Associate Planner APPEAL The Site Plan Review Committee’s decision in this matter may be appealed pursuant to Chapter 18.10 YMC, to the City of Yelm Hearing Examiner no later than 21 days from the date of this decision. An appeal must be in writing, contain specific factual objections, and include the appeal fee of $1,250.00. Appl ica#iarL Permi Typu M InlaUorlal Pe rmits F MniS erial She Plan Griew F Boundary Line Adjuetrnenl r 1-11p Qo-,UpaliOn F Other Admin islrative Fermils r Admiralralive Site Plan R*view W Adp*kir ralive Subdivsion F AdrrMr4 iral" Vsnsnoe r" $15(3fl $1t4iVi$ipr5 }p�aitiJ��iipl Fprmiga r Swing Sne plan F P4Fni wA FN,*k 4nlip1 M -u. 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Cwwroms I Edits PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP R PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP R· · · · · · · · · · · · · · · · · · · · TYPE 2 CATCH BASIN (CB#10) BOTTOM ELEV. = 319.00 8' (2.4 m) MAX 18" (450 mm) MIN* MATERIAL LOCATION DESCRIPTION AASHTO MATERIAL CLASSIFICATIONS COMPACTION / DENSITY REQUIREMENT D FINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THE TOP OF THE 'C' LAYER TO THE BOTTOM OF FLEXIBLE PAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THAT PAVEMENT SUBBASE MAY BE PART OF THE 'D' LAYER ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS. CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS. N/A PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND PREPARATION REQUIREMENTS. C INITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THE TOP OF THE EMBEDMENT STONE ('B' LAYER) TO 18" (450 mm) ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENT SUBBASE MAY BE A PART OF THE 'C' LAYER. GRANULAR WELL-GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR PROCESSED AGGREGATE. MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS LAYER. AASHTO M145¹ A-1, A-2-4, A-3 OR AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 BEGIN COMPACTIONS AFTER 12" (300 mm) OF MATERIAL OVER THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN 6" (150 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR PROCESSED AGGREGATE MATERIALS. ROLLER GROSS VEHICLE WEIGHT NOT TO EXCEED 12,000 lbs (53 kN). DYNAMIC FORCE NOT TO EXCEED 20,000 lbs (89 kN). B EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS FROM THE FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYER ABOVE. CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 NO COMPACTION REQUIRED. A FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE SUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER. CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE. ² ³ PLEASE NOTE: 1. THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE". 2. STORMTECH COMPACTION REQUIREMENTS ARE MET FOR 'A' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 6" (150 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR. 3. WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FOR COMPACTION REQUIREMENTS.PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP RNOTES: 1. SC-740 CHAMBERS SHALL CONFORM TO THE REQUIREMENTS OF ASTM F2418 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS", OR ASTM F2922 "STANDARD SPECIFICATION FOR POLYETHYLENE (PE) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 2. SC-740 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 3. "ACCEPTABLE FILL MATERIALS" TABLE ABOVE PROVIDES MATERIAL LOCATIONS, DESCRIPTIONS, GRADATIONS, AND COMPACTION REQUIREMENTS FOR FOUNDATION, EMBEDMENT, AND FILL MATERIALS. 4. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH CONSIDERATION FOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS. 5. PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS. 6. ONCE LAYER 'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER 'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION. INSPECTION PORT 12" X 12" ADS N-12 MANIFOLD PLACE MINIMUM 12.5' OF ADS GEOSYNTHETICS 315WTK WOVEN GEOTEXTILE OVER BEDDING STONE AND UNDERNEATH CHAMBER FEET FOR SCOUR PROTECTION AT ALL CHAMBER INLET ROWS EXCAVATION WALL (CAN BE SLOPED OR VERTICAL) SUBGRADE SOILS (SEE NOTE 5) ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE ALL AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS 12" (300 mm) MIN PERIMETER STONE (SEE NOTE 6) SC-740 END CAP *TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR, INCREASE COVER TO 24" (600 mm). 51" (1295 mm)6" (150 mm) MIN A B C D 30" (760 mm) 12" 12" (300 mm) TYP 6" (150 mm) MIN PAVEMENT LAYER (DESIGNED BY SITE DESIGN ENGINEER) ACCEPTABLE FILL MATERIALS: STORMTECH SC-740 CHAMBER SYSTEMS SECTION A-A A A BAYSAVER - BAYFILTER DETAIL (CB#9) NTS 12"Ø PIPE - INLET - 324.70 36" FRAME AND COVER (MARKED "STORM" PER WSDOT STANDARD PLAN B-30.70-03 12"Ø INLET TREATED SEDIMENT CAPACITY # BAYFILTER CARTRIDGES CARTRIDGE DESIGN FLOW RATE DRAINAGE AREA WATER QUALITY FLOW BAYFILTER 60-2 MANHOLE LOCATION PROJECT 36" FRAME & COVER 2 MOUNTAIN MEADOWS CB#10 30 GPM 0.1051 CFS 12"Ø PIPE - OUTLET - 322.03 OVERFLOW ELEV.=168.20 COVERED BYPASS 12"Ø OUTLET RIM - ±173.00 NOTE: SEE WSDOT STANDARD PLANS B-10.20-01 B-30.90-01 FOR ACCESS AND STEP/LADDER LOCATION/ ORIENTATION AND DETAILS. SEPA Environmental checklist (WAC 197-11-960) Page 1 of 10 SEPA ENVIRONMENTAL CHECKLIST Purpose of checklist: Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant. This information is also helpful to determine if available avoidance, minimization or compensatory mitigation measures will address the probable significant impacts or if an environmental impact statement will be prepared to further analyze the proposal. Instructions for applicants: This environmental checklist asks you to describe some basic information about your proposal. Please answer each question accurately and carefully, to the best of your knowledge. You may need to consult with an agency specialist or private consultant for some questions. You may use “not applicable” or "does not apply" only when you can explain why it does not apply and not when the answer is unknown. You may also attach or incorporate by reference additional studies reports. Complete and accurate answers to these questions often avoid delays with the SEPA process as well as later in the decision- making process. The checklist questions apply to all parts of your proposal, even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there may be significant adverse impact. Instructions for Lead Agencies: Please adjust the format of this template as needed. Additional information may be necessary to evaluate the existing environment, all interrelated aspects of the proposal and an analysis of adverse impacts. The checklist is considered the first but not necessarily the only source of information needed to make an adequate threshold determination. Once a threshold determination is made, the lead agency is responsible for the completeness and accuracy of the checklist and other supporting documents. The help links in this checklist are intended to assist users in accessing guidance on the checklist questions. Links are provided to the specific sections of the guidance applicable to the questions. However, the links may not work correctly on all devices. If the links do not work on your device, open the guidance at www.ecy.wa.gov/programs/sea/sepa/apguide/EnvChecklistGuidance.html and navigate to the appropriate section. Use of checklist for nonproject proposals: For nonproject proposals (such as ordinances, regulations, plans and programs), complete the applicable parts of sections A and B plus the SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS (part D). Please completely answer all questions that apply and note that the words "project," "applicant," and "property or site" should be read as "proposal," "proponent," and "affected geographic area," respectively. The lead agency may exclude (for non-projects) questions in Part B - Environmental Elements –that do not contribute meaningfully to the analysis of the proposal. SEPA Environmental checklist (WAC 197-11-960) Page 2 of 10 A. Background 1. Name of proposed project, if applicable: Mountain Meadows 2. Name of applicant: Henrietta Morey 3. Address and phone number of applicant and contact person: PO Box 202 Kapowsin, WA 98344 (253) 377-8400 4. Date checklist prepared: November 5, 2020 5. Agency requesting checklist: City of Yelm, WA 6. Proposed timing or schedule (including phasing, if applicable): The infrastructure will be completed in one phase with anticipated substantial construction completion by winter/spring 2022. At this time it is unknown when the homes will be completed. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. None at this time 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. None at this time 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. None known 10. List any government approvals or permits that will be needed for your proposal, if known. Department of Ecology Stormwater Permit; grading permit; right-of-way encroachment permit; preliminary and final plat approvals 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. Subdivide two parcels totalling 4.4-acres into 22 single-family residential lots with associated public roadway, public/private utilities, and storm drainage improvements. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and range, if known. NE ¼ of the SE ¼ of Section 13, Township 17 North, Range 1 East, W.M. 8818 Burnett Road SE Yelm, WA 98597 Parcel Numbers: 21713310400 & 21713310402 SEPA Environmental checklist (WAC 197-11-960) Page 3 of 10 B. ENVIRONMENTAL ELEMENTS 1. Earth a. General description of the site: (circle one): Flat, rolling, hilly, steep slopes, mountainous, other _____________ b. What is the steepest slope on the site (approximate percent slope)? Approximately 7% c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any agricultural land of long-term commercial significance and whether the proposal results in removing any of these soils. Spanaway Gravelly Sandy Loam (HSG A) per the NRCS. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. None known e. Describe the purpose, type, total area, and approximate quantities and total affected area of any filling, excavation, and grading proposed. Indicate source of fill. Approximately 3,500 cubic yards of grading will be required to construct the proposed improvments (roadways, utility trenches, storm drainage facility). f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. Erosion can occur during construction of the proposed improvements improvements. An erosion and sedimentation control plan will be prepared meeting City of Yelm requirements and Best Management Practices (BMP’s) will be implemented during and after construction to prevent and control erosion. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? Approximately 58% (roadways, sidewalks, homes, driveways, patios, walkways) h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any: An erosion and sedimentation control plan will be prepared meeting City of Yelm requirements and Best Management Practices (BMP’s) will be implemented during and after construction to prevent and control erosion. 2. Air a. What types of emissions to the air would result from the proposal during construction, operation, and maintenance when the project is completed? If any, generally describe and give approximate quantities if known. Emissions from typical construction equipment and dust during contruction; emissions from vehicles after the project is completed. Quantities are unkown. b. Are there any off-site sources of emissions or odor that may affect your proposal? If so, generally describe. None known c. Proposed measures to reduce or control emissions or other impacts to air, if any: None SEPA Environmental checklist (WAC 197-11-960) Page 4 of 10 3. Water a. Surface Water: 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. No. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. No. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. None 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. No 5) Does the proposal lie within a 100-year floodplain? If so, note location on the site plan. No 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste and anticipated volume of discharge. No b. Ground Water: 1) Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses and approximate quantities withdrawn from the well. Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. Yes. Groundwater will be withdrawn from existing municipal wells for domestic uses associated with the proposal. Quantities are currently unknown. 2) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: Domestic sewage; industrial, containing the following chemicals. . . ; agricultural; etc.). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. None. c. Water runoff (including stormwater): 1) Describe the source of runoff (including storm water) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. Stormwater runoff from the proposed public roadway areas will be collected and routed to an on- site stormwater treatment and detention/infiltration facility. All stormwater runoff generated by the proposed site improvements will be contained and fully infiltrated on-site. 2) Could waste materials enter ground or surface waters? If so, generally describe. SEPA Environmental checklist (WAC 197-11-960) Page 5 of 10 Not likely. A pollution source control plan will be a part of a storm drainage maintenance agreement that will be recored at the county auditor’s office prior to final project approval. This plan will outline the Best Management Practices to help reduce the potential for any waste materials to enter ground water. 3) Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. No d. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: Stormwater runoff from the proposed public roadway areas will be collected and routed to an on- site stormwater treatment and detention/infiltration facility. All stormwater runoff generated by the proposed site improvements will be contained and fully infiltrated on-site. 4. Plants a. Check the types of vegetation found on the site: ___deciduous tree: alder, maple, aspen __X_evergreen tree: fir, cedar, pine, other __X_shrubs __X_grass __X _pasture ____crop or grain ____ Orchards, vineyards or other permanent crops. ____ wet soil plants: cattail, buttercup, bullrush, skunk cabbage, other ____water plants: water lily, eelgrass, milfoil, other ____other types of vegetation b. What kind and amount of vegetation will be removed or altered? The majority of on-site vegetation (fir trees, grass) will be removed as needed to construct the proposed improvements and future homesites. c. List threatened and endangered species known to be on or near the site. None known d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any: Street trees will be provided along the public roadways per city requirements. It is anticipated that each lot will be landscaped as they develop. e. List all noxious weeds and invasive species known to be on or near the site. None known 5. Animals a. List any birds and other animals which have been observed on or near the site or are known to be on or near the site. Examples include: birds: hawk, heron, eagle, songbirds, other: SEPA Environmental checklist (WAC 197-11-960) Page 6 of 10 mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other ________ b. List any threatened and endangered species known to be on or near the site. None known c. Is the site part of a migration route? If so, explain. Unknown d. Proposed measures to preserve or enhance wildlife, if any: None e. List any invasive animal species known to be on or near the site. None known 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. Electricity and natural gas will be used for heating and general electrical needs for the homes. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. No c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any: The proposed homes will meet or exceed Washington State energy code requirements. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste, that could occur as a result of this proposal? If so, describe. None known 1) Describe any known or possible contamination at the site from present or past uses. None known 2) Describe existing hazardous chemicals/conditions that might affect project development and design. This includes underground hazardous liquid and gas transmission pipelines located within the project area and in the vicinity. None known 3) Describe any toxic or hazardous chemicals that might be stored, used, or produced during the project's development or construction, or at any time during the operating life of the project. None 4) Describe special emergency services that might be required. None 5) Proposed measures to reduce or control environmental health hazards, if any: None b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? SEPA Environmental checklist (WAC 197-11-960) Page 7 of 10 No existing noises will affect the proposal. 2) What types and levels of noise would be created by or associated with the project on a short-term or a long-term basis (for example: traffic, construction, operation, other)? Indi- cate what hours noise would come from the site. Short-term: Construction equipment noise during construction Long-term: Noises typical to vehicle traffic for a residential community 3) Proposed measures to reduce or control noise impacts, if any: Construction hours will be limited to city approved hours 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Will the proposal affect current land uses on nearby or adjacent properties? If so, describe. The site currently contains an old barn. Adjacent parcels are residential. The proposal will not affect land uses on nearby or adjacent properties. b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses as a result of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use? Unknown but unlikely 1) Will the proposal affect or be affected by surrounding working farm or forest land normal business operations, such as oversize equipment access, the application of pesticides, tilling, and harvesting? If so, how: No c. Describe any structures on the site. Barn d. Will any structures be demolished? If so, what? Yes, a barn will demolished. e. What is the current zoning classification of the site? Residential, R-6 f. What is the current comprehensive plan designation of the site? Residential g. If applicable, what is the current shoreline master program designation of the site? Not applicable h. Has any part of the site been classified as a critical area by the city or county? If so, specify. No i. Approximately how many people would reside or work in the completed project? Approximately 55 residents j. Approximately how many people would the completed project displace? None k. Proposed measures to avoid or reduce displacement impacts, if any: None L. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any: The project will meet City of Yelm zoning code requirements. SEPA Environmental checklist (WAC 197-11-960) Page 8 of 10 m. Proposed measures to ensure the proposal is compatible with nearby agricultural and forest lands of long-term commercial significance, if any: None 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, mid- dle, or low-income housing. 22 units, middle income housing. b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. None c. Proposed measures to reduce or control housing impacts, if any: None 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? Building code allows for up to a 35’ building height. It is anticipated that the future homes will be sided with cement fiber siding with various patterns. b. What views in the immediate vicinity would be altered or obstructed? None b. Proposed measures to reduce or control aesthetic impacts, if any: None 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? Public street lighting and exterior building lighting from dusk to dawn b. Could light or glare from the finished project be a safety hazard or interfere with views? Not likely. Light fixtures will be shielded. c. What existing off-site sources of light or glare may affect your proposal? None known d. Proposed measures to reduce or control light and glare impacts, if any: Light fixtures will be shielded. 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? The Yelm High School is located 0.8-miles away from the project site and Yelm City Park and Cochrane Memorial Park are located approximately 2-miles away. b. Would the proposed project displace any existing recreational uses? If so, describe. No c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any: SEPA Environmental checklist (WAC 197-11-960) Page 9 of 10 A sports court (volleyball, pickleball, etc.) and/or an outdoor play structure will be provided in the proposed open space tract to help meet the city’s recreation/open space requirements. 13. Historic and cultural preservation a. Are there any buildings, structures, or sites, located on or near the site that are over 45 years old listed in or eligible for listing in national, state, or local preservation registers located on or near the site? If so, specifically describe. None listed per the Washington State Department of Archaeology & Historic Preservation website (WISAARD database). b. Are there any landmarks, features, or other evidence of Indian or historic use or occupation? This may include human burials or old cemeteries. Are there any material evidence, artifacts, or areas of cultural importance on or near the site? Please list any professional studies conducted at the site to identify such resources. None observed on or near the site and no listings in the WISAARD database. c. Describe the methods used to assess the potential impacts to cultural and historic resources on or near the project site. Examples include consultation with tribes and the department of archeology and historic preservation, archaeological surveys, historic maps, GIS data, etc. Review of Washington State Department of Archaeology & Historic Preservation website (WISAARD database). d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and disturbance to resources. Please include plans for the above and any permits that may be required. None at this time. 14. Transportation a. Identify public streets and highways serving the site or affected geographic area and describe proposed access to the existing street system. Show on site plans, if any. A new internal public roadway will be constructed, connecting Burnett Rd. SE to 89th Way SE/89th Ave. b. Is the site or affected geographic area currently served by public transit? If so, generally describe. If not, what is the approximate distance to the nearest transit stop? The nearest Intercity Transit stop is located at the Yelm High School which is approximately 0.8- miles away from the project site. c. How many additional parking spaces would the completed project or non-project proposal have? How many would the project or proposal eliminate? Approximately 44 total off-street parking spaces will be provided (minimum 2 spaces per home per city zoning requirements. d. Will the proposal require any new or improvements to existing roads, streets, pedestrian, bicycle or state transportation facilities, not including driveways? If so, generally describe (indicate whether public or private). No e. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. No f. How many vehicular trips per day would be generated by the completed project or proposal? If known, indicate when peak volumes would occur and what percentage of the volume would SEPA Environmental checklist (WAC 197-11-960) Page 10 of 10 be trucks (such as commercial and nonpassenger vehicles). What data or transportation models were used to make these estimates? Approximately 209 vehicle trips per day will be generated by the project with peak hours between 4 p.m - 6 p.m. per the Trip Generation Manual prepared by the Institute of Transporation Engineers. g. Will the proposal interfere with, affect or be affected by the movement of agricultural and forest products on roads or streets in the area? If so, generally describe. No h. Proposed measures to reduce or control transportation impacts, if any: Traffic mitigation fees will be paid if required 15. Public Services a. Would the project result in an increased need for public services (for example: fire protection, police protection, public transit, health care, schools, other)? If so, generally describe. No new public service facilties are proposed; however, the project will increase the need on existing public services. b. Proposed measures to reduce or control direct impacts on public services, if any. Mitigation fees will be paid as required. 16. Utilities a. Circle utilities currently available at the site: electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other ___________ b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. City of Yelm water and sanitary sewer, refuse/recycling service from Pacific Disposal; telecommunications from Fairpoint Communications and Comcast; elecrictiy and natural gas from Puget Sound Energy C. Signature The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: ___________________________________________________ Name of signee _Chris Merritt_______________________________________ Position and Agency/Organization _Olympic Engineering _________________ Date Submitted: _November 5, 2020____________ 1975 State Route 6 · Raymond, Washington 98577 · (360) 562-5763 Key Environmental Solutions, LLC. September 23, 2020 City of Yelm Community Development Attn: Tami Merriman, Associate Planner 106 2nd St SE Yelm, WA 98597 Re: Mountain Meadows Preliminary Plat Prairie Habitat Critical Area Recon and ESA No Effect Letter, Thurston County Parcels #21713310400 and 21713310402. Located at 8818 Burnett Road SE, Yelm, Washington, Section 13, Township 17 North, Range 01 East, W.M., and in accordance with the Thurston County Critical Areas Ordinance Title 24.03 (Definitions), Interim Prairie Ordinance 14542, WDFW Management Recommendations for Washington Priority Habitats Oregon White Oak Woodlands and WDFW Habitat Management Recommendations for the Mazama Pocket Gophers and following the 2018 USFWS Mazama Pocket Gopher Screening Protocol. Dear Ms. Merriman, Key Environmental Solutions, LLC. (KES) has completed a Prairie Habitat Area Recon on the above referenced parcels located at 8818 Burnett Road SE, Yelm, Washington. Fieldwork was conducted on August 31, 2020. Project Description and Findings The parcels reviewed are approximately 4.37 acres located in eastern Thurston County, in the city of Yelm. Both are currently undeveloped, except for a barn on parcel 21713310400. The parcel was reviewed for prairie habitat and Mazama Pocket Gophers. When the site is developed with single family or multi-family units, there will be not any “Take” of any state or federally listed species. There will be “No Effect” on prairie habitat, Mazama Pocket Gophers or any other critical areas or buffer impacted. KES reviewed Washington Department of Fish and Wildlife’s (WDFW) Priority Habitat Species (PHS) lists and maps and no listed species were found to occur onsite. Adjacent areas were also looked at for any critical areas or listed species, and none were found to occur. Henrietta Morey Key Environmental Solutions, LLC. Prairie Habitat Recon & No Effect September 23, 2020 2 Vegetation on the parcel consists of: Common Name Sc. Name Status Notes Black hawthorn Crataegus douglasii FAC Camas, common Camassia quamash FACW Little Canada thistle Cirsium arvense FACU common dandelion Taraxacum officinale FACU common vetch Vicia sativa FAC cut-leaf blackberry Rubus laciniatus FACU Douglas fir Pseudotsuga menziesii FACU hairy cat's ear Hypochaeris radicata FACU Himalayan blackberry Rubus armenicus FACU Juniper haircap moss Polytrichum juniperinum FACU Dense klamath weed Hypericum perforatum FACU lamb’s quarter Chenopodium album FACU meadow fescue Festuca pratensis FACU orchardgrass Dactylis glomerata FACU pepper weed Lepidium latifolium FACU plantain Plantago lanceolata FAC Scotch broom Cytisus scoparius FACU sheep sorrel Rumex acetosella FACU Snowberry Symphoricarpos albus FACU The project area was required to be reviewed due to the presence of prairie soils. KES reviewed the Natural Resource Conservation Service Soils (NRCS) maps and verified that prairie soils did not exist in the project area. Soil Types Prairie Soil Spanaway gravelly sandy loam, 0 to 3 % slopes Yes Mapped prairie soils do not necessarily mean that the area is a prairie –vegetation, landuse, development, and historical land practices may have changed the soil conditions. Current site conditions may or may not accurately reflect mapped soils. Conversely, prairies may be found in areas where the soils are not mapped as prairie soils. Federal ESA Species, Habitats and No Effect There are no Federal ESA species or habitats that exist within the parcel. There will be “No Effect” and/or “No Take” from the proposed project. Historically, the parcel was part of a farm that was used to raise horses. There were no mounds of any kind found to occur onsite. KES has performed one site visit as required. KES determined that parcel does not meet the definition of prairie from USFWS and that there has been no Mazama Gopher occurrence found on adjacent parcels or anywhere in the vicinity. Henrietta Morey Key Environmental Solutions, LLC. Prairie Habitat Recon & No Effect September 23, 2020 3 There is a subdivision directly to the south of the parcels. It is KES’s professional opinion that development of these parcels will not impact any prairie species or any other critical areas and should be permitted. KES concurs with the proposed site plan. Looking east across parcel. Looking east across parcel Looking west across parcel. Looking north across parcel. Looking south across parcel. Looking northwest across parcel. Henrietta Morey Key Environmental Solutions, LLC. Prairie Habitat Recon & No Effect September 23, 2020 4 Professional Standard of Care: Please be advised that KES personnel has provided professional services that are in accordance with the degree of care and skill generally accepted in the performance of this environmental evaluation. Fish and Wildlife Habitat Assessments together with wetland delineations, mitigation plans, classifications, ratings, streamtyping, riparian planting plans, ordinary high water line determinations, fish removal and other critical area analysis should be reviewed and approved by the agency with permitting authority and potentially other agencies with regulatory authority prior to extensive site design or development. No warranties are expressed or implied by this assessment until approved by the appropriate resource and permitting agency. The findings expressed in this report are based on field investigations, best available data, best available science, and our professional judgement. The services described in this report were performed consistent with generally accepted professional consulting principles and practices. The services performed were consistent with our agreement with our client. Key Environmental Solutions, LLC, (KES) is not responsible for the impacts of any changes in environmental standards, practices, or regulations after the date of this report. KES does not warrant the accuracy of supplemental information incorporated in this report that was supplied by others. Thank you for the opportunity to evaluate this project and please contact us if you have any questions regarding this information, our findings, conclusions, or recommendations at (360) 942-3184 or (360) 562-5763. Sincerely, Key McMurry Owner/Professional Stream and Wildlife Biologist, SPWS The information included on this map has been compiled by Thurston County staff from a variety of sources and is subject to change without notice. Additional elements may be present in reality that are not represented on the map. Ortho-photos and other data may not align. The boundaries depicted by these datasets are approximate. This document is not intended for use as a survey product. ALL DATA IS EXPRESSLY PROVIDED ‘AS IS’ AND ‘WITH ALL FAULTS’. Thurston County makes no representations or warranties, express or implied, as to accuracy, completeness, timeliness, or rights to the use of such information. In no event shall Thurston County be liable for direct, indirect, incidental, consequential, special, or tort damages of any kind, including, but not limited to, lost revenues or lost profits, real or anticipated, resulting from the use, misuse or reliance of the information contained on this map. If any portion of this map or disclaimer is missing or altered, Thurston County removes itself from all responsibility from the map and the data contained within. The burden for determining fitness for use lies entirely with the user and the user is solely responsible for understanding the accuracy limitation of the information contained in this map. Authorized for 3rd Party reproduction for personal use only. Morey Soils 2,028Scale 1: 0 8/30/2020 Note: Legend 100 200 Feet Published: Map Created Using GeoData Public Website Gopher Indicator Soils Less Preferred More Preferred Soils (USDA) Alderwood gravelly sandy loam, 0 to 3% slopes Alderwood gravelly sandy loam, 15 to 30% slopes Alderwood gravelly sandy loam, 3 to 15% slopes Alderwood gravelly sandy loam, 30 to 50% slopes Baldhill very stony sandy loam, 0 to 3% slopes Baldhill very stony sandy loam, 15 to 30% slopes Baldhill very stony sandy loam, 3 to 15% slopes Baldhill very stony sandy loam, 30 to 50% slopes Baumgard loam, 10 to 40% slopes Baumgard loam, 40 to 65% slopes Baumgard-Pheeney Comples, 40 to 65% slopes Baumgard-Pheeney complex, 10 to 40% slopes Baumgard-Rock outcrop complex, 40 to 65% slopes Bellingham silty clay loam Boisfort silt loam, 20 to 40% slopes Boisfort silt loam, 5 to 20% slopes Bunker gravelly silt loam, 30 to 65% slopes Bunker gravelly silt loam, 5 to 30% slopes Bunker-Boisfort complex, 40 to 65% slopes Cagey loamy sand 2020©Thurston County Site Name and Parcel # Parcel #: _________________________________________________ Project #: ________________________________________________ Site/Landowner: __________________________________________ How were the data collected? (circle the method for each) Transect: Trimble Garmin Aerial Mounds Trimble Garmin Aerial Notes: ___________________________________________________ Field Team Personnel: (Indicate all staff present, CIRCLE who filled out form) Name: Name: Name: Others onsite (name/affiliation) Site visit # (CIRCLE all that apply) 1st 2nd Unable to screen Notes: Do onsite conditions preclude the need for further visits? Yes No Dense woody cover that encompasses the entire site (trees/shrubs) that appears to preclude any potential MPG use. Impervious Compacted Graveled Flooded Other ______________ Notes: Describe visibility for mound detection: Poor Fair Good Notes: Request mowing? (CIRCLE and DESCRIBE WHERE MOWING IS NEEDED and SHOW ON AERIAL PHOTO Yes No N/A Notes: 2020 Thurston County Mazama Pocket Gopher Screening Field Form Site Visit Date: ______________ August 31, 2020 21713310400, 21713310402 770.01 Henrietta Morey Key McMurry, Key Environmental Solutions, LLC Landowner Very Rocky, compacted Mounds observed over the whole site are characteristic of: Quantify or describe amount of each type and approx. # of mounds Group = 3 mounds or more No MPG mounds (circle) MPG mounds in GPS? (CIRCLE and DESCRIBE) If MPG mounds present, entered in GPS? None All Most Some Notes: Yes No N/A Does woody vegetation onsite match aerial photo? Yes No - describe differences and show on parcel map/aerial: What portion(s) of the property was screened? (CIRCLE and DESCRIBE) All Part - describe and show on parcel map/aerial: Notes - Describe, and show on parcel map/aerial if applicable: Team reviewed and agreed to data recorded on form? (CIRCLE, and EXPLAIN if “No”) Yes No Reviewed by initials: _____ _____ _____ _____ Notes: MPG Mounds Likely MPG Mounds Indeterminate Likely Mole Mounds Mole Mounds N/A N/A N/A 0 0 KM 21713310400, 21713310402 Henrietta Morey Key McMurry, Key Environmental Solutions 8/31/2020 Non-CAO ve?etation Species or codons (i.e. •HYPRAO" for Hypochaeris radicata) Notes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pra rie Hab,tat Criteria: If at any point at least three target species, tota,ing 1n general at east 25 plants each are encountered within about 5 me�rs of each other (WDFW 2015), the area in question meets the cmeria to be established as oc currence of prairie. For cernin p ants such as WNHP rare p ants (indicated here ,n bold), or species which serves as nectar or host plants for both TCB and either SCC or SGCN butterflies (indicated here with underline), presence is enough to meet prairie habitat criteria for such speoes, e•;en rf their count 1s less than 25 indMdual plants CAO wet and dry prairie plant ists can be found ,n Tables 2425-7 and 24.25-8, r espectively. More info available at: https//www .thumoncountywa.,gov/planning/Pages/hcp-pra,rie-rev,ew . .sp,c M1ma mounds and oak habitat definitions can be found in TCC 24.03.010 Pa e 2 of 2 August 31, 2020 Mountain Meadows Yelm, Washington Stormwater Site Plan Report November 5, 2020 Prepared by: PO Box 12690 Olympia, WA 98508 360.705.2474 www.olyeng.com I STORMWATER SITE PLAN REPORT MOUNTAIN MEADOWS Yelm, Washington November 5, 2020 Project Information Prepared for: Henrietta Morey Contact: Henrietta Morey PO Box 202 Kapowsin, WA 98344 Reviewing Agency Jurisdiction: City of Yelm Project Number: ___________________ Project Contact: Tami Merriman, Associate Planner References WSDOE Stormwater Management Manual for Western Washington, 2014 ed. (Stormwater Manual) Project Engineer Prepared by: Olympic Engineering, Inc. 11/5/2020 PO Box 12690 Olympia, WA 98508 (360) 705-2474 www.olyeng.com Contact: Chris Merritt, PE OE Project: 20047 File Number: 20047_pdr.doc II Table of Contents STORMWATER SITE PLAN REPORT ........................................................ I TABLE OF CONTENTS ................................................................................. II PART 1 – PROJECT OVERVIEW ................................................................. 1 PART 2 – EXISTING CONDITONS SUMMARY ......................................... 1 PART 3 – OFF-SITE ANAYLSIS .................................................................... 2 PART 4 – PERMANENT STORMWATER CONTROL PLAN ................... 2 Applicable Minimum Requirements .................................................................. 2 PART 5 – SPECIAL REPORTS AND STUDIES ......................................... 6 PART 6 – OTHER PERMITS ......................................................................... 6 PART 7 – OPERATION AND MAINTENANCE MANUAL ........................ 6 APPENDICES Appendix 1 – Preliminary Drainage Plans Appendix 2 – Preliminary Drainage Calculations Appendix 3 - Soils Report ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 1 PART 1 – PROJECT OVERVIEW Site Address: 8818 Burnett Rd. SE Yelm, WA 98597 Parcel Number: 21713310400 & 21713310402 Total Proposed Lease Area: ±4.389 Acres Zoning: R-6 Section, Township, Range: Section 13 Township 17 North Range 1 East, W.M. Proposed Improvements The proposed project will include subdividing two parcels totaling 4.389-acres into 22 single-family residential lots with associated roadway, frontage, water, sanitary sewer, storm drainage, landscaping, and private/public utility improvements. PART 2 – EXISTING CONDITONS SUMMARY The site contains an existing barn that will be demolished and removed. Topography is gently sloping down from east to west at an average slope of approximately 2-3%. Site vegetation consists mainly of pasture grasses and scotch bloom with a few conifer trees located mainly in the southwestern portion of the site. The Natural Resources Conservation Service (NRCS) Soil Survey of Thurston County classifies the on-site and surrounding area soils as Spanaway Gravelly Sandy Loam (HSG A). A Soils Report was prepared by Parnell Engineering, dated September 18, 2020 and the soils encountered were consistent with the Spanaway classification. Two test pits were dug to a depth of 168” below-grade and no groundwater, or indications of, were encountered. See Soils Report in Appendix. Per FEMA FIRM Map Panel #53045C0335E, the project site and surrounding areas are within Zone X. The Zone X designation signifies areas that are outside of the 0.2% annual chance floodplain. There are no known critical areas (wetlands, streams, steep slopes, etc.) located on or within the immediate vicinity of the project site. The site and surrounding area are located in a Category I Critical Aquifer Recharge Area (CARA). All stormwater management BMP’s will meet or exceed DDECM requirements. ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 2 PART 3 – OFF-SITE ANAYLSIS The project site is bounded by Burnett Rd. SE to the west; by undeveloped parcels to the east and north; and by developed residential parcels to the south. There are no apparent indications of stormwater runoff entering the project site from surrounding properties and there does not appear to be any noticeable stormwater runoff from the subject parcel onto adjacent parcels. Stormwater runoff from the Burnett Rd. frontage currently sheet flows to a roadside ditch. There is no known ultimate outfall point other than infiltration within the ditch. All stormwater runoff generated by the proposed improvements will be dispersed and/or infiltrated on-site; therefore, a quantitative off-site analysis and/or mitigation is not warranted. PART 4 – PERMANENT STORMWATER CONTROL PLAN Applicable Minimum Requirements The minimum requirements for stormwater development and redevelopment sites are listed in Section I-2.4 of Volume I of the Stormwater Manual. Based on the thresholds given in this section, the proposed project must address or comment on Minimum Requirements #1 through #9. These requirements have been addressed as follows: Minimum Requirement #1 – Preparation of Stormwater Site Plans: A Stormwater Site Plan has been prepared (see Site Plan). Minimum Requirement #2 – Construction Stormwater Pollution Prevention Plan (SWPPP): A SWPPP meeting city requirements will be provided with the final Stormwater Site Plan Report. Minimum Requirement #3 – Source Control of Pollution: A Pollution Source Control Program will be prepared and provided prior to final project approval, if required. Minimum Requirement #4 – Preservation of Natural Drainage Systems and Outfalls: There are no known natural drainage systems or outfalls located on or immediately adjacent to the proposed lease area. ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 3 Minimum Requirement #5 – On-Site Stormwater Management: This project will meet the LID Performance Standard. The proposed stormwater Best Management Practices (BMP’s) are as follows: Lawn and Landscape Areas: • All disturbed areas, including the roadside planter areas and future individual lot lawn/landscape areas, will contain soils meeting the Post- Construction Soil Quality and Depth (BMP T5.13) requirements. Roof Areas: • It is anticipated that Stormwater runoff from the future individual lot roof areas will be tightlined to individual lot downspout infiltration trenches (BMP T5.10A) for detention and 100% infiltration of stormwater runoff from the roof areas. See Minimum Requirement #7 below for additional information. Other Hard Surface Areas: • Stormwater runoff from east half of the Burnett Rd. frontage and the on- site roadway will be collected and conveyed to a Type 2 catch basin containing Baysaver Bayfilter™ cartridges for treatment. Treated stormwater will be conveyed to a below-grade Infiltration Trench (BMP T7.20) consisting of StormTech chambers for storage and 100% infiltration. See Minimum Requirement #6 and #7 below for additional information. • Stormwater runoff from the improved portion of 89th Way will sheet flow to the existing storm drainage system located along 89th Ave. and ultimately be conveyed through a bioswale and into a detention pond located in Burnett Estates. There is only 2,462 sf of net new hard surface area associated with the 89th Way improvements and the existing Burnett Estates stormwater system has capacity to accommodate this additional runoff. • It is anticipated that stormwater runoff from the future individual lot driveway, walkway, and patio areas will be sheet flow dispersed (BMP T5.12) onto adjacent lawn/landscape areas. Soils within the dispersion areas will meet the Post-Construction Soil Quality and Depth (BMP T5.13) requirements. Modeling Narrative • Stormwater runoff from all proposed hard surface areas are being infiltrated and are considered “non-effective”; therefore, they can be excluded from the hard surface area threshold determination of Minimum Requirement #7. • In order to help meet the flow control requirement, stormwater runoff from the individual lot lawn/landscape and dispersed driveway/walkway/patio areas have been routed to a Compost Amended Vegetated Filter Strip (CAVFS) in WWHM. See Minimum Requirement #7 below for additional information. ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 4 • All lawn/landscape areas will meet the Post-Construction Soil Quality and Depth (BMP T5.13) requirements and have been modeled as “pasture” in WWHM. • The roof areas have been excluded from WWHM as they are not being routed to the main stormwater facility and they will be sized per prescriptive sizing standards for 100% infiltration. • The pre-developed land coverage has been modeled as “pasture”. • The project has a single Threshold Discharge Area (TDA). • Parnell Engineering recommended a 20”/hr design infiltration rate for the below-grade infiltration facility; however, a 15”/hr rate was used in WWHM to be conservative. Parcel Area: 4.389 acres Off-Site Area: 0.101 acres (East half of Burnett Rd.) Off-Site Area: 0.202 acres (89th Way SE) Total Project Area: 4.692 acres Project Areas Pre-Developed (Acres) Sub-Basin #1 Sub-Basin #2 Total Roadway 0.054 0.114 0.168 Roof 0.039 0.039 Pasture/Brush 4.397 4.397 Lawn/Landscape 0.088 0.088 Total 4.490 0.202 4.692 Project Areas Post-Developed (Acres) Sub-Basin #1 Sub-Basin #2 Total Roadway 0.6451 0.1271 0.772 Sidewalks 0.0861 0.0231 0.109 Roof (assumed on lots) 1.0101,2,3 1.010 Driveways (w/in R/W) 0.0611 0.061 Driveway (assumed on lots) 0.2533 0.253 Misc. (Walkway/ Patio) (assumed on lots) 0.5053 0.505 Lawn/Landscape (assumed on lots) 1.7363 1.736 Lawn/Landscape (w/in R/W) 0.1941 0.0521 0.246 Total 4.490 0.202 4.692 ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 5 1 “Non-effective” hard surface areas as these areas are being infiltrated. 2 Infiltrated hard surfaces (roof areas) not being routed to the main stormwater facility have been excluded from the post-developed scenario in WWHM. 3 It has been assumed that each lot will have a total of 3,500 sf of hard surface coverage (2,000 sf roof, 500 sf driveway, 1,000 sf walkway/patios) and the remaining lot area will consist of lawn/landscape. Minimum Requirement #6 – Runoff Treatment: This project will create more than 5,000 square-feet of new total pollution- generating hard surface (PGHS) area; therefore, a Runoff Treatment facility is required. Two Baysaver Bayfilter™ cartridges (BFC 30 gpm) will provide treatment of stormwater runoff from all pollution generating hard surface (PGHS) areas (parking lot and sidewalks contributing to the parking lot). Per WWHM modeling results, this project is required to treat a 15-minute water quality flow rate of 0.1051 cfs. 0.1223 cfs / 0.067 cfs/cartridge = 1.83 (Use two 30 gpm cartridges) The Washington State Department of Ecology issued a “General Use Level Designation for Basic Treatment” for this filter when using a 30 gpm/cartridge design flow rate (see Appendix). Minimum Requirement #7 – Flow Control: This project will create less than 10,000 square-feet of “effective” hard surface area, there will be less than a 0.15-cfs increase in the 100-year recurrence interval flow frequency from the pre- to post-developed condition, and less than 2.5-acres of native vegetation will be converted to pasture; however, more than ¾-acre of vegetation will be converted to lawn/landscape; therefore, Flow Control is applicable. See Minimum Requirement #5 above for a detailed description of the proposed Stormwater Management BMP’s. Per WWHM, the project meets the LID Performance Standard. In order to reduce the effective hard surface area and to help meet the flow control requirement, stormwater runoff from the individual lot lawn/landscape and dispersed driveway/walkway/patio areas have been routed to a Compost Amended Vegetated Filter Strip (CAVFS) in WWHM. Per the WWHM user’s manual, “The CAVFS surface area automatically receives rainfall and produces evapotranspiration. Due to this model input the CAVFS surface area should be excluded from the basin element’s total surface area.” Since the entire lawn/landscape area essentially is a CAVFS, the basin element area would become zero. However, to be conservative, the total proposed lawn/landscape surface area has been routed to the CAVFS. Furthermore, only the lawn/landscape area adjacent to the driveways along with the down-slope yard areas have been utilized as a CAVFS. In this situation, the CAVFS is intended to be a flow control facility with infiltration to the underlying soils. A 3”/hr infiltration rate of the underlying soils was used in WWHM (A 4”/hr rate for the surface soils was recommended in the Soils Report prepared by Parnell Engineering and a 3”/hr rate is typical for amended soils). ____________________________________________________________________________________ November 2020 Stormwater Site Plan Report 6 The 4’ high infiltration trench will provide for 1.6’ of freeboard. At a maximum ponding depth of 2.4’, the facility will draw down in 1.9 hours (2.4’x12”)/15”/hr = 1.9 hours). Minimum Requirement #8 – Wetlands Protection: There are no known wetlands on or immediately adjacent to the project site; therefore, this Minimum Requirement is not applicable. Minimum Requirement #9 – Operation and Maintenance: An operation and maintenance manual will be prepared prior to final project approval. The owner will be responsible for maintaining all stormwater facilities located on-site. PART 5 – SPECIAL REPORTS AND STUDIES A Soils Report for Evaluating Site Feasibility of Stormwater Infiltration, dated September 18, 2020 has been prepared by Parnell Engineering (see Appendix). PART 6 – OTHER PERMITS Right-of-way encroachment and grading permits will be required prior to construction start. A stormwater permit will be obtained from Ecology. PART 7 – OPERATION AND MAINTENANCE MANUAL An operation and maintenance manual will be provided prior to final project approval. The owner will be responsible for maintaining all stormwater facilities located on-site. Appendix 1 Preliminary Drainage Plans PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP R PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP R· · · · · · · · · · · · · · · · · · · · TYPE 2 CATCH BASIN (CB#10) BOTTOM ELEV. = 319.00 8' (2.4 m) MAX 18" (450 mm) MIN* MATERIAL LOCATION DESCRIPTION AASHTO MATERIAL CLASSIFICATIONS COMPACTION / DENSITY REQUIREMENT D FINAL FILL: FILL MATERIAL FOR LAYER 'D' STARTS FROM THE TOP OF THE 'C' LAYER TO THE BOTTOM OF FLEXIBLE PAVEMENT OR UNPAVED FINISHED GRADE ABOVE. NOTE THAT PAVEMENT SUBBASE MAY BE PART OF THE 'D' LAYER ANY SOIL/ROCK MATERIALS, NATIVE SOILS, OR PER ENGINEER'S PLANS. CHECK PLANS FOR PAVEMENT SUBGRADE REQUIREMENTS. N/A PREPARE PER SITE DESIGN ENGINEER'S PLANS. PAVED INSTALLATIONS MAY HAVE STRINGENT MATERIAL AND PREPARATION REQUIREMENTS. C INITIAL FILL: FILL MATERIAL FOR LAYER 'C' STARTS FROM THE TOP OF THE EMBEDMENT STONE ('B' LAYER) TO 18" (450 mm) ABOVE THE TOP OF THE CHAMBER. NOTE THAT PAVEMENT SUBBASE MAY BE A PART OF THE 'C' LAYER. GRANULAR WELL-GRADED SOIL/AGGREGATE MIXTURES, <35% FINES OR PROCESSED AGGREGATE. MOST PAVEMENT SUBBASE MATERIALS CAN BE USED IN LIEU OF THIS LAYER. AASHTO M145¹ A-1, A-2-4, A-3 OR AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57, 6, 67, 68, 7, 78, 8, 89, 9, 10 BEGIN COMPACTIONS AFTER 12" (300 mm) OF MATERIAL OVER THE CHAMBERS IS REACHED. COMPACT ADDITIONAL LAYERS IN 6" (150 mm) MAX LIFTS TO A MIN. 95% PROCTOR DENSITY FOR WELL GRADED MATERIAL AND 95% RELATIVE DENSITY FOR PROCESSED AGGREGATE MATERIALS. ROLLER GROSS VEHICLE WEIGHT NOT TO EXCEED 12,000 lbs (53 kN). DYNAMIC FORCE NOT TO EXCEED 20,000 lbs (89 kN). B EMBEDMENT STONE: FILL SURROUNDING THE CHAMBERS FROM THE FOUNDATION STONE ('A' LAYER) TO THE 'C' LAYER ABOVE. CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 NO COMPACTION REQUIRED. A FOUNDATION STONE: FILL BELOW CHAMBERS FROM THE SUBGRADE UP TO THE FOOT (BOTTOM) OF THE CHAMBER. CLEAN, CRUSHED, ANGULAR STONE, NOMINAL SIZE DISTRIBUTION BETWEEN 3/4-2 INCH (20-50 mm) AASHTO M43¹ 3, 357, 4, 467, 5, 56, 57 PLATE COMPACT OR ROLL TO ACHIEVE A FLAT SURFACE. ² ³ PLEASE NOTE: 1. THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN, CRUSHED, ANGULAR. FOR EXAMPLE, A SPECIFICATION FOR #4 STONE WOULD STATE: "CLEAN, CRUSHED, ANGULAR NO. 4 (AASHTO M43) STONE". 2. STORMTECH COMPACTION REQUIREMENTS ARE MET FOR 'A' LOCATION MATERIALS WHEN PLACED AND COMPACTED IN 6" (150 mm) (MAX) LIFTS USING TWO FULL COVERAGES WITH A VIBRATORY COMPACTOR. 3. WHERE INFILTRATION SURFACES MAY BE COMPROMISED BY COMPACTION, FOR STANDARD DESIGN LOAD CONDITIONS, A FLAT SURFACE MAY BE ACHIEVED BY RAKING OR DRAGGING WITHOUT COMPACTION EQUIPMENT. FOR SPECIAL LOAD DESIGNS, CONTACT STORMTECH FOR COMPACTION REQUIREMENTS.PO Box 12690Olympia, WA 98508360.705.2474Www.olyeng.com CHRIM.MERSTR ITHOT EP RNOTES: 1. SC-740 CHAMBERS SHALL CONFORM TO THE REQUIREMENTS OF ASTM F2418 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS", OR ASTM F2922 "STANDARD SPECIFICATION FOR POLYETHYLENE (PE) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 2. SC-740 CHAMBERS SHALL BE DESIGNED IN ACCORDANCE WITH ASTM F2787 "STANDARD PRACTICE FOR STRUCTURAL DESIGN OF THERMOPLASTIC CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". 3. "ACCEPTABLE FILL MATERIALS" TABLE ABOVE PROVIDES MATERIAL LOCATIONS, DESCRIPTIONS, GRADATIONS, AND COMPACTION REQUIREMENTS FOR FOUNDATION, EMBEDMENT, AND FILL MATERIALS. 4. THE SITE DESIGN ENGINEER IS RESPONSIBLE FOR ASSESSING THE BEARING RESISTANCE (ALLOWABLE BEARING CAPACITY) OF THE SUBGRADE SOILS AND THE DEPTH OF FOUNDATION STONE WITH CONSIDERATION FOR THE RANGE OF EXPECTED SOIL MOISTURE CONDITIONS. 5. PERIMETER STONE MUST BE EXTENDED HORIZONTALLY TO THE EXCAVATION WALL FOR BOTH VERTICAL AND SLOPED EXCAVATION WALLS. 6. ONCE LAYER 'C' IS PLACED, ANY SOIL/MATERIAL CAN BE PLACED IN LAYER 'D' UP TO THE FINISHED GRADE. MOST PAVEMENT SUBBASE SOILS CAN BE USED TO REPLACE THE MATERIAL REQUIREMENTS OF LAYER 'C' OR 'D' AT THE SITE DESIGN ENGINEER'S DISCRETION. INSPECTION PORT 12" X 12" ADS N-12 MANIFOLD PLACE MINIMUM 12.5' OF ADS GEOSYNTHETICS 315WTK WOVEN GEOTEXTILE OVER BEDDING STONE AND UNDERNEATH CHAMBER FEET FOR SCOUR PROTECTION AT ALL CHAMBER INLET ROWS EXCAVATION WALL (CAN BE SLOPED OR VERTICAL) SUBGRADE SOILS (SEE NOTE 5) ADS GEOSYNTHETICS 601T NON-WOVEN GEOTEXTILE ALL AROUND CLEAN, CRUSHED, ANGULAR STONE IN A & B LAYERS 12" (300 mm) MIN PERIMETER STONE (SEE NOTE 6) SC-740 END CAP *TO BOTTOM OF FLEXIBLE PAVEMENT. FOR UNPAVED INSTALLATIONS WHERE RUTTING FROM VEHICLES MAY OCCUR, INCREASE COVER TO 24" (600 mm). 51" (1295 mm)6" (150 mm) MIN A B C D 30" (760 mm) 12" 12" (300 mm) TYP 6" (150 mm) MIN PAVEMENT LAYER (DESIGNED BY SITE DESIGN ENGINEER) ACCEPTABLE FILL MATERIALS: STORMTECH SC-740 CHAMBER SYSTEMS SECTION A-A A A BAYSAVER - BAYFILTER DETAIL (CB#9) NTS 12"Ø PIPE - INLET - 324.70 36" FRAME AND COVER (MARKED "STORM" PER WSDOT STANDARD PLAN B-30.70-03 12"Ø INLET TREATED SEDIMENT CAPACITY # BAYFILTER CARTRIDGES CARTRIDGE DESIGN FLOW RATE DRAINAGE AREA WATER QUALITY FLOW BAYFILTER 60-2 MANHOLE LOCATION PROJECT 36" FRAME & COVER 2 MOUNTAIN MEADOWS CB#10 30 GPM 0.1051 CFS 12"Ø PIPE - OUTLET - 322.03 OVERFLOW ELEV.=168.20 COVERED BYPASS 12"Ø OUTLET RIM - ±173.00 NOTE: SEE WSDOT STANDARD PLANS B-10.20-01 B-30.90-01 FOR ACCESS AND STEP/LADDER LOCATION/ ORIENTATION AND DETAILS. Appendix 2 Preliminary Drainage Calculations Project: Chamber Model - SC-740 Units -Imperial Number of chambers -21 Voids in the stone (porosity) - 40 % Base of Stone Elevation -0.00 ft Amount of Stone Above Chambers - 6 in Amount of Stone Below Chambers -12 in Area of system -895 sf Min. Area - Height of System Incremental Single Chamber Incremental Total Chamber Incremental Stone Incremental Ch & St Cumulative Chamber Elevation (inches)(cubic feet)(cubic feet)(cubic feet)(cubic feet)(cubic feet)(feet) 48 0.00 0.00 29.83 29.83 2010.98 4.00 47 0.00 0.00 29.83 29.83 1981.15 3.92 46 0.00 0.00 29.83 29.83 1951.31 3.83 45 0.00 0.00 29.83 29.83 1921.48 3.75 44 0.00 0.00 29.83 29.83 1891.65 3.67 43 0.00 0.00 29.83 29.83 1861.81 3.58 42 0.05 1.15 29.37 30.53 1831.98 3.50 41 0.16 3.42 28.46 31.89 1801.45 3.42 40 0.28 5.92 27.47 33.39 1769.57 3.33 39 0.60 12.68 24.76 37.44 1736.18 3.25 38 0.80 16.84 23.10 39.93 1698.74 3.17 37 0.95 19.96 21.85 41.81 1658.80 3.08 36 1.07 22.56 20.81 43.37 1616.99 3.00 35 1.18 24.79 19.92 44.71 1573.62 2.92 34 1.27 26.58 19.20 45.78 1528.91 2.83 33 1.36 28.46 18.45 46.91 1483.13 2.75 32 1.45 30.54 17.62 48.15 1436.23 2.67 31 1.52 32.02 17.03 49.04 1388.07 2.58 30 1.58 33.23 16.54 49.77 1339.03 2.50 29 1.64 34.49 16.04 50.53 1289.26 2.42 28 1.70 35.69 15.56 51.25 1238.73 2.33 27 1.75 36.81 15.11 51.92 1187.48 2.25 26 1.80 37.86 14.69 52.55 1135.56 2.17 25 1.85 38.95 14.25 53.21 1083.01 2.08 24 1.89 39.75 13.93 53.69 1029.81 2.00 23 1.93 40.61 13.59 54.20 976.12 1.92 22 1.97 41.47 13.24 54.72 921.92 1.83 21 2.01 42.21 12.95 55.16 867.20 1.75 20 2.04 42.94 12.66 55.60 812.04 1.67 19 2.07 43.57 12.40 55.98 756.44 1.58 18 2.10 44.20 12.15 56.36 700.46 1.50 17 2.13 44.77 11.93 56.69 644.11 1.42 16 2.15 45.23 11.74 56.97 587.41 1.33 15 2.18 45.72 11.55 57.26 530.44 1.25 14 2.20 46.17 11.37 57.53 473.18 1.17 13 2.21 46.35 11.29 57.65 415.65 1.08 StormTech SC-740 Cumulative Storage Volumes Mountain Meadows 710 sf min. area Include Perimeter Stone in Calculations 12 0.00 0.00 29.83 29.83 358.00 1.00 11 0.00 0.00 29.83 29.83 328.17 0.92 10 0.00 0.00 29.83 29.83 298.33 0.83 9 0.00 0.00 29.83 29.83 268.50 0.75 8 0.00 0.00 29.83 29.83 238.67 0.67 7 0.00 0.00 29.83 29.83 208.83 0.58 6 0.00 0.00 29.83 29.83 179.00 0.50 5 0.00 0.00 29.83 29.83 149.17 0.42 4 0.00 0.00 29.83 29.83 119.33 0.33 3 0.00 0.00 29.83 29.83 89.50 0.25 2 0.00 0.00 29.83 29.83 59.67 0.17 1 0.00 0.00 29.83 29.83 29.83 0.08 WWHM2012 PROJECT REPORT 20047_101920 11/4/2020 2:10:51 PM Page 2 General Model Information Project Name:20047_101920 Site Name:Mountain Meadows Site Address:8818 Burnett Rd City:Yelm Report Date:11/4/2020 Gage:Eaton Creek Data Start:1955/10/01 Data End:2011/09/30 Timestep:15 Minute Precip Scale:0.857 Version Date:2018/10/10 Version:4.2.16 POC Thresholds Low Flow Threshold for POC1:50 Percent of the 2 Year High Flow Threshold for POC1:50 Year Low Flow Threshold for POC3:50 Percent of the 2 Year High Flow Threshold for POC3:50 Year 20047_101920 11/4/2020 2:10:51 PM Page 3 Landuse Basin Data Predeveloped Land Use Basin 1 Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 4.436 Pervious Total 4.436 Impervious Land Use acre ROADS FLAT 0.054 Impervious Total 0.054 Basin Total 4.49 Element Flows To: Surface Interflow Groundwater 20047_101920 11/4/2020 2:10:51 PM Page 4 Water Quality Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 0.194 Pervious Total 0.194 Impervious Land Use acre ROADS FLAT 0.645 DRIVEWAYS FLAT 0.061 SIDEWALKS FLAT 0.086 Impervious Total 0.792 Basin Total 0.986 Element Flows To: Surface Interflow Groundwater 20047_101920 11/4/2020 2:10:51 PM Page 5 Mitigated Land Use Basin 1 - Roads Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 0.194 Pervious Total 0.194 Impervious Land Use acre ROADS FLAT 0.645 DRIVEWAYS FLAT 0.061 SIDEWALKS FLAT 0.086 Impervious Total 0.792 Basin Total 0.986 Element Flows To: Surface Interflow Groundwater SSD Table 1 SSD Table 1 20047_101920 11/4/2020 2:10:51 PM Page 6 Water Quality Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 0.194 Pervious Total 0.194 Impervious Land Use acre ROADS FLAT 0.645 DRIVEWAYS FLAT 0.061 SIDEWALKS FLAT 0.086 Impervious Total 0.792 Basin Total 0.986 Element Flows To: Surface Interflow Groundwater 20047_101920 11/4/2020 2:10:51 PM Page 7 Basin 1 - Lots Bypass:No GroundWater:No Pervious Land Use acre A B, Pasture, Flat 1.736 Pervious Total 1.736 Impervious Land Use acre DRIVEWAYS FLAT 0.253 SIDEWALKS FLAT 0.505 Impervious Total 0.758 Basin Total 2.494 Element Flows To: Surface Interflow Groundwater CAVFS 1 Surface 1 CAVFS 1 Surface 1 20047_101920 11/4/2020 2:10:51 PM Page 8 Routing Elements Predeveloped Routing 20047_101920 11/4/2020 2:10:51 PM Page 9 Mitigated Routing SSD Table 1 Depth:4 ft. Discharge Structure: 1 Riser Height:3 ft. Riser Diameter:8 in. Element Flows To: Outlet 1 Outlet 2 SSD Table Hydraulic Table Stage Area Volume Outlet Infilt (feet) (ac.) (ac-ft.) Struct (cfs) NotUsed NotUsed NotUsed 0.000 0.021 0.000 0.000 0.311 0.000 0.000 0.000 0.083 0.021 0.001 0.000 0.311 0.000 0.000 0.000 0.167 0.021 0.001 0.000 0.311 0.000 0.000 0.000 0.250 0.021 0.002 0.000 0.311 0.000 0.000 0.000 0.333 0.021 0.003 0.000 0.311 0.000 0.000 0.000 0.417 0.021 0.003 0.000 0.311 0.000 0.000 0.000 0.500 0.021 0.004 0.000 0.311 0.000 0.000 0.000 0.583 0.021 0.005 0.000 0.311 0.000 0.000 0.000 0.667 0.021 0.005 0.000 0.311 0.000 0.000 0.000 0.750 0.021 0.006 0.000 0.311 0.000 0.000 0.000 0.833 0.021 0.007 0.000 0.311 0.000 0.000 0.000 0.917 0.021 0.008 0.000 0.311 0.000 0.000 0.000 1.000 0.021 0.008 0.000 0.311 0.000 0.000 0.000 1.083 0.021 0.010 0.000 0.311 0.000 0.000 0.000 1.167 0.021 0.011 0.000 0.311 0.000 0.000 0.000 1.250 0.021 0.012 0.000 0.311 0.000 0.000 0.000 1.333 0.021 0.013 0.000 0.311 0.000 0.000 0.000 1.417 0.021 0.015 0.000 0.311 0.000 0.000 0.000 1.500 0.021 0.016 0.000 0.311 0.000 0.000 0.000 1.583 0.021 0.017 0.000 0.311 0.000 0.000 0.000 1.667 0.021 0.019 0.000 0.311 0.000 0.000 0.000 1.750 0.021 0.020 0.000 0.311 0.000 0.000 0.000 1.833 0.021 0.021 0.000 0.311 0.000 0.000 0.000 1.917 0.021 0.022 0.000 0.311 0.000 0.000 0.000 2.000 0.021 0.024 0.000 0.311 0.000 0.000 0.000 2.083 0.021 0.025 0.000 0.311 0.000 0.000 0.000 2.167 0.021 0.026 0.000 0.311 0.000 0.000 0.000 2.250 0.021 0.027 0.000 0.311 0.000 0.000 0.000 2.333 0.021 0.028 0.000 0.311 0.000 0.000 0.000 2.417 0.021 0.030 0.000 0.311 0.000 0.000 0.000 2.500 0.021 0.031 0.000 0.311 0.000 0.000 0.000 2.583 0.021 0.032 0.000 0.311 0.000 0.000 0.000 2.667 0.021 0.033 0.000 0.311 0.000 0.000 0.000 2.750 0.021 0.034 0.000 0.311 0.000 0.000 0.000 2.833 0.021 0.035 0.000 0.311 0.000 0.000 0.000 2.917 0.021 0.036 0.000 0.311 0.000 0.000 0.000 3.000 0.021 0.037 0.000 0.311 0.000 0.000 0.000 3.083 0.021 0.038 0.168 0.311 0.000 0.000 0.000 3.167 0.021 0.039 0.442 0.311 0.000 0.000 0.000 3.250 0.021 0.040 0.678 0.311 0.000 0.000 0.000 3.333 0.021 0.041 0.800 0.311 0.000 0.000 0.000 3.417 0.021 0.041 0.904 0.311 0.000 0.000 0.000 20047_101920 11/4/2020 2:10:51 PM Page 10 3.500 0.021 0.042 0.990 0.311 0.000 0.000 0.000 3.583 0.021 0.043 1.069 0.311 0.000 0.000 0.000 3.667 0.021 0.043 1.143 0.311 0.000 0.000 0.000 3.750 0.021 0.044 1.212 0.311 0.000 0.000 0.000 3.833 0.021 0.045 1.278 0.311 0.000 0.000 0.000 3.917 0.021 0.045 1.340 0.311 0.000 0.000 0.000 4.000 0.021 0.046 1.400 0.311 0.000 0.000 0.000 20047_101920 11/4/2020 2:10:51 PM Page 11 CAVFS 1 CAVFS Length: 1276.00 ft. CAVFS Width:10.00 ft. Gravel thickness: 1 ft. Material thickness of CAVFS layer: 0.75 ft. Slope of CAVFS layer: 0.075 ft. Infiltration On Infiltration rate:3 Infiltration safety factor:1 Total Volume Infiltrated (ac-ft.):119.871 Total Volume Through Riser (ac-ft.):0 Total Volume Through Facility (ac-ft.):119.879 Percent Infiltrated:99.99 Total Precip Applied to Facility:3.809 Total Evap From Facility:2.485 Outlet Control Overflow Height: 0.5 ft. Overflow width: 638 in. Element Flows To: Outlet 1 Outlet 2 CAVFS Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)Infilt(cfs) 0.0000 0.0220 0.0000 0.0000 0.0000 0.1286 0.0220 0.0012 0.0000 0.0000 0.2571 0.0220 0.0023 0.0000 0.0000 0.3857 0.0220 0.0035 0.0000 0.0000 0.5143 0.0220 0.0047 0.0000 0.0000 0.6429 0.0220 0.0059 0.0000 0.0000 0.7714 0.0220 0.0070 0.0000 0.0000 0.9000 0.0220 0.0082 0.0000 0.0000 1.0286 0.0220 0.0095 0.0000 0.0000 1.1571 0.0220 0.0108 0.0001 0.9747 1.2857 0.0220 0.0121 0.0001 0.9747 1.4143 0.0220 0.0134 0.0002 0.9747 1.5429 0.0220 0.0147 0.0002 0.9747 1.6714 0.0220 0.0160 0.0003 0.9747 1.8000 0.0220 0.0172 0.0004 0.9747 1.9286 0.0220 0.0185 0.0006 0.9747 2.0571 0.0220 0.0198 0.0007 0.9747 2.1857 0.0220 0.0211 0.0008 0.9747 2.3143 0.0220 0.0224 0.0010 0.9747 2.4429 0.0220 0.0237 0.0012 0.9747 2.5714 0.0220 0.0250 0.0014 0.9747 2.7000 0.0220 0.0263 0.0017 0.9747 2.8286 0.0220 0.0276 0.0020 0.9747 2.9571 0.0220 0.0289 0.0023 0.9747 3.0857 0.0220 0.0302 0.0026 0.9747 3.2143 0.0220 0.0315 0.0029 0.9747 3.3429 0.0220 0.0327 0.0033 0.9747 3.4714 0.0220 0.0340 0.0037 0.9747 3.6000 0.0220 0.0353 0.0041 0.9747 3.7286 0.0220 0.0366 0.0045 0.9747 3.8571 0.0220 0.0379 0.0050 0.9747 3.9857 0.0220 0.0392 0.0055 0.9747 20047_101920 11/4/2020 2:10:51 PM Page 12 4.1143 0.0220 0.0405 0.0061 0.9747 4.2429 0.0220 0.0418 0.0066 0.9747 4.3714 0.0220 0.0431 0.0072 0.9747 4.5000 0.0220 0.0444 0.0079 0.9747 4.6286 0.0220 0.0457 0.0085 0.9747 4.7571 0.0220 0.0470 0.0092 0.9747 4.8857 0.0220 0.0482 0.0099 0.9747 5.0143 0.0220 0.0495 0.0107 0.9747 5.1429 0.0220 0.0508 0.0115 0.9747 5.2714 0.0220 0.0521 0.0123 0.9747 5.4000 0.0220 0.0534 0.0132 0.9747 5.5286 0.0220 0.0547 0.0141 0.9747 5.6571 0.0220 0.0560 0.0150 0.9747 5.7857 0.0220 0.0573 0.0160 0.9747 5.9143 0.0220 0.0586 0.0170 0.9747 6.0429 0.0220 0.0599 0.0180 0.9747 6.1714 0.0220 0.0612 0.0191 0.9747 6.3000 0.0220 0.0625 0.0202 0.9747 6.4286 0.0220 0.0637 0.0214 0.9747 6.5571 0.0220 0.0650 0.0226 0.9747 6.6857 0.0220 0.0663 0.0238 0.9747 6.8143 0.0220 0.0676 0.0251 0.9747 6.9429 0.0220 0.0689 0.0264 0.9747 7.0714 0.0220 0.0702 0.0278 0.9747 7.2000 0.0220 0.0715 0.0292 0.9747 7.3286 0.0220 0.0728 0.0306 0.9747 7.4571 0.0220 0.0741 0.0321 0.9747 7.5857 0.0220 0.0754 0.0336 0.9747 7.7143 0.0220 0.0767 0.0352 0.9747 7.8429 0.0220 0.0780 0.0368 0.9747 7.9714 0.0220 0.0793 0.0385 0.9747 8.1000 0.0220 0.0805 0.0402 0.9747 8.2286 0.0220 0.0818 0.0419 0.9747 8.3571 0.0220 0.0831 0.0437 0.9747 8.4857 0.0220 0.0844 0.0455 0.9747 8.6143 0.0220 0.0857 0.0474 0.9747 8.7429 0.0220 0.0870 0.0493 0.9747 8.8714 0.0220 0.0883 0.0513 0.9747 9.0000 0.0220 0.0896 0.0533 0.9747 9.1286 0.0220 0.0909 0.0554 0.9747 9.2571 0.0220 0.0922 0.0575 0.9747 9.3857 0.0220 0.0935 0.0596 0.9747 9.5143 0.0220 0.0948 0.0618 0.9747 9.6429 0.0220 0.0960 0.0641 0.9747 9.7714 0.0220 0.0973 0.0664 0.9747 9.9000 0.0220 0.0986 0.0687 0.9747 10.029 0.0220 0.0999 0.0711 0.9747 10.157 0.0220 0.1012 0.0736 0.9747 10.286 0.0220 0.1025 0.0760 0.9747 10.414 0.0220 0.1038 0.0786 0.9747 10.543 0.0220 0.1051 0.0811 0.9747 10.671 0.0220 0.1064 0.1445 0.9747 10.800 0.0220 0.1077 0.1445 0.9747 10.929 0.0220 0.1090 0.1445 0.9747 11.000 0.0220 0.1097 0.1445 0.9747 CAVFS Hydraulic Table Stage(feet)Area(ac.)Volume(ac-ft.)Discharge(cfs)To Amended(cfs)Infilt(cfs) 20047_101920 11/4/2020 2:10:51 PM Page 13 11.000 0.0220 0.1097 0.0000 1.1193 0.0000 11.129 0.0220 0.1125 0.0000 1.1193 0.0000 11.257 0.0220 0.1153 0.0000 1.1193 0.0000 11.386 0.0220 0.1182 0.0000 1.1193 0.0000 11.514 0.0220 0.1210 0.0000 1.1193 0.0000 11.643 0.0220 0.1238 0.0000 1.1193 0.0000 11.700 0.0220 0.1251 0.0000 1.1193 0.0000 20047_101920 11/4/2020 2:10:51 PM Page 14 CAVFS 1 Surface 1 Element Flows To: Outlet 1 Outlet 2 CAVFS 1 20047_101920 11/4/2020 2:10:51 PM Page 15 Analysis Results POC 1 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #1 Total Pervious Area:4.436 Total Impervious Area:0.054 Mitigated Landuse Totals for POC #1 Total Pervious Area:1.93 Total Impervious Area:1.55 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #1 Return Period Flow(cfs) 2 year 0.022097 5 year 0.035407 10 year 0.047212 25 year 0.066301 50 year 0.084098 100 year 0.105474 Flow Frequency Return Periods for Mitigated. POC #1 Return Period Flow(cfs) 2 year 0.000018 5 year 0.000025 10 year 0.00003 25 year 0.000038 50 year 0.000045 100 year 0.000052 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #1 Year Predeveloped Mitigated 1956 0.062 0.000 1957 0.027 0.000 1958 0.016 0.000 1959 0.018 0.000 1960 0.021 0.000 1961 0.029 0.000 1962 0.022 0.000 1963 0.042 0.000 1964 0.019 0.000 1965 0.022 0.000 20047_101920 11/4/2020 2:11:18 PM Page 16 1966 0.014 0.000 1967 0.027 0.000 1968 0.016 0.000 1969 0.013 0.000 1970 0.015 0.000 1971 0.062 0.000 1972 0.185 0.000 1973 0.019 0.000 1974 0.027 0.000 1975 0.017 0.000 1976 0.018 0.000 1977 0.026 0.000 1978 0.024 0.000 1979 0.025 0.000 1980 0.017 0.000 1981 0.035 0.000 1982 0.034 0.000 1983 0.034 0.000 1984 0.021 0.000 1985 0.018 0.000 1986 0.019 0.000 1987 0.029 0.000 1988 0.014 0.000 1989 0.035 0.000 1990 0.018 0.000 1991 0.107 0.000 1992 0.021 0.000 1993 0.042 0.000 1994 0.021 0.000 1995 0.031 0.000 1996 0.045 0.000 1997 0.016 0.000 1998 0.028 0.000 1999 0.019 0.000 2000 0.016 0.000 2001 0.015 0.000 2002 0.011 0.000 2003 0.024 0.000 2004 0.024 0.000 2005 0.015 0.000 2006 0.014 0.000 2007 0.023 0.000 2008 0.014 0.000 2009 0.017 0.000 2010 0.029 0.000 2011 0.014 0.000 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #1 Rank Predeveloped Mitigated 1 0.1847 0.0001 2 0.1070 0.0000 3 0.0624 0.0000 4 0.0623 0.0000 5 0.0446 0.0000 6 0.0424 0.0000 7 0.0418 0.0000 8 0.0352 0.0000 20047_101920 11/4/2020 2:11:18 PM Page 17 9 0.0351 0.0000 10 0.0341 0.0000 11 0.0340 0.0000 12 0.0306 0.0000 13 0.0293 0.0000 14 0.0293 0.0000 15 0.0290 0.0000 16 0.0279 0.0000 17 0.0271 0.0000 18 0.0269 0.0000 19 0.0267 0.0000 20 0.0256 0.0000 21 0.0246 0.0000 22 0.0241 0.0000 23 0.0241 0.0000 24 0.0239 0.0000 25 0.0229 0.0000 26 0.0223 0.0000 27 0.0216 0.0000 28 0.0213 0.0000 29 0.0212 0.0000 30 0.0210 0.0000 31 0.0210 0.0000 32 0.0194 0.0000 33 0.0193 0.0000 34 0.0192 0.0000 35 0.0192 0.0000 36 0.0185 0.0000 37 0.0182 0.0000 38 0.0178 0.0000 39 0.0177 0.0000 40 0.0174 0.0000 41 0.0170 0.0000 42 0.0166 0.0000 43 0.0165 0.0000 44 0.0163 0.0000 45 0.0159 0.0000 46 0.0159 0.0000 47 0.0150 0.0000 48 0.0150 0.0000 49 0.0149 0.0000 50 0.0145 0.0000 51 0.0143 0.0000 52 0.0139 0.0000 53 0.0136 0.0000 54 0.0135 0.0000 55 0.0132 0.0000 56 0.0110 0.0000 20047_101920 11/4/2020 2:11:18 PM Page 18 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.0110 1737 0 0 Pass 0.0118 1337 0 0 Pass 0.0125 1081 0 0 Pass 0.0133 843 0 0 Pass 0.0140 659 0 0 Pass 0.0147 527 0 0 Pass 0.0155 416 0 0 Pass 0.0162 355 0 0 Pass 0.0170 305 0 0 Pass 0.0177 262 0 0 Pass 0.0184 219 0 0 Pass 0.0192 185 0 0 Pass 0.0199 157 0 0 Pass 0.0206 143 0 0 Pass 0.0214 122 0 0 Pass 0.0221 109 0 0 Pass 0.0229 82 0 0 Pass 0.0236 70 0 0 Pass 0.0243 62 0 0 Pass 0.0251 53 0 0 Pass 0.0258 49 0 0 Pass 0.0265 47 0 0 Pass 0.0273 42 0 0 Pass 0.0280 36 0 0 Pass 0.0288 34 0 0 Pass 0.0295 29 0 0 Pass 0.0302 28 0 0 Pass 0.0310 26 0 0 Pass 0.0317 26 0 0 Pass 0.0324 24 0 0 Pass 0.0332 22 0 0 Pass 0.0339 22 0 0 Pass 0.0347 19 0 0 Pass 0.0354 15 0 0 Pass 0.0361 15 0 0 Pass 0.0369 15 0 0 Pass 0.0376 13 0 0 Pass 0.0383 12 0 0 Pass 0.0391 11 0 0 Pass 0.0398 11 0 0 Pass 0.0406 11 0 0 Pass 0.0413 10 0 0 Pass 0.0420 9 0 0 Pass 0.0428 8 0 0 Pass 0.0435 8 0 0 Pass 0.0443 8 0 0 Pass 0.0450 6 0 0 Pass 0.0457 6 0 0 Pass 0.0465 6 0 0 Pass 0.0472 6 0 0 Pass 0.0479 6 0 0 Pass 0.0487 6 0 0 Pass 0.0494 6 0 0 Pass 20047_101920 11/4/2020 2:11:18 PM Page 19 0.0502 6 0 0 Pass 0.0509 6 0 0 Pass 0.0516 6 0 0 Pass 0.0524 5 0 0 Pass 0.0531 5 0 0 Pass 0.0538 5 0 0 Pass 0.0546 5 0 0 Pass 0.0553 5 0 0 Pass 0.0561 4 0 0 Pass 0.0568 4 0 0 Pass 0.0575 4 0 0 Pass 0.0583 4 0 0 Pass 0.0590 4 0 0 Pass 0.0597 4 0 0 Pass 0.0605 4 0 0 Pass 0.0612 4 0 0 Pass 0.0620 4 0 0 Pass 0.0627 2 0 0 Pass 0.0634 2 0 0 Pass 0.0642 2 0 0 Pass 0.0649 2 0 0 Pass 0.0657 2 0 0 Pass 0.0664 2 0 0 Pass 0.0671 2 0 0 Pass 0.0679 2 0 0 Pass 0.0686 2 0 0 Pass 0.0693 2 0 0 Pass 0.0701 2 0 0 Pass 0.0708 2 0 0 Pass 0.0716 2 0 0 Pass 0.0723 2 0 0 Pass 0.0730 2 0 0 Pass 0.0738 2 0 0 Pass 0.0745 2 0 0 Pass 0.0752 2 0 0 Pass 0.0760 2 0 0 Pass 0.0767 2 0 0 Pass 0.0775 2 0 0 Pass 0.0782 2 0 0 Pass 0.0789 2 0 0 Pass 0.0797 2 0 0 Pass 0.0804 2 0 0 Pass 0.0811 2 0 0 Pass 0.0819 2 0 0 Pass 0.0826 2 0 0 Pass 0.0834 2 0 0 Pass 0.0841 2 0 0 Pass 20047_101920 11/4/2020 2:11:18 PM Page 20 Water Quality Water Quality BMP Flow and Volume for POC #1 On-line facility volume:0 acre-feet On-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. Off-line facility target flow:0 cfs. Adjusted for 15 min:0 cfs. 20047_101920 11/4/2020 2:11:18 PM Page 21 LID Report 20047_101920 11/4/2020 2:11:22 PM Page 22 POC 2 POC #2 was not reported because POC must exist in both scenarios and both scenarios must have been run. 20047_101920 11/4/2020 2:11:22 PM Page 23 POC 3 + Predeveloped x Mitigated Predeveloped Landuse Totals for POC #3 Total Pervious Area:0.194 Total Impervious Area:0.792 Mitigated Landuse Totals for POC #3 Total Pervious Area:0.194 Total Impervious Area:0.792 Flow Frequency Method:Log Pearson Type III 17B Flow Frequency Return Periods for Predeveloped. POC #3 Return Period Flow(cfs) 2 year 0.276182 5 year 0.373147 10 year 0.441074 25 year 0.531254 50 year 0.601654 100 year 0.674863 Flow Frequency Return Periods for Mitigated. POC #3 Return Period Flow(cfs) 2 year 0.276182 5 year 0.373147 10 year 0.441074 25 year 0.531254 50 year 0.601654 100 year 0.674863 Annual Peaks Annual Peaks for Predeveloped and Mitigated. POC #3 Year Predeveloped Mitigated 1956 0.221 0.221 1957 0.391 0.391 1958 0.199 0.199 1959 0.265 0.265 1960 0.311 0.311 1961 0.241 0.241 1962 0.326 0.326 1963 0.449 0.449 1964 0.278 0.278 1965 0.261 0.261 1966 0.199 0.199 20047_101920 11/4/2020 2:11:48 PM Page 24 1967 0.225 0.225 1968 0.217 0.217 1969 0.194 0.194 1970 0.209 0.209 1971 0.215 0.215 1972 0.346 0.346 1973 0.243 0.243 1974 0.350 0.350 1975 0.247 0.247 1976 0.258 0.258 1977 0.374 0.374 1978 0.318 0.318 1979 0.360 0.360 1980 0.242 0.242 1981 0.504 0.504 1982 0.499 0.499 1983 0.498 0.498 1984 0.302 0.302 1985 0.233 0.233 1986 0.269 0.269 1987 0.292 0.292 1988 0.154 0.154 1989 0.514 0.514 1990 0.236 0.236 1991 0.616 0.616 1992 0.304 0.304 1993 0.622 0.622 1994 0.305 0.305 1995 0.407 0.407 1996 0.321 0.321 1997 0.191 0.191 1998 0.408 0.408 1999 0.258 0.258 2000 0.192 0.192 2001 0.190 0.190 2002 0.149 0.149 2003 0.309 0.309 2004 0.346 0.346 2005 0.215 0.215 2006 0.162 0.162 2007 0.306 0.306 2008 0.191 0.191 2009 0.224 0.224 2010 0.375 0.375 2011 0.183 0.183 Ranked Annual Peaks Ranked Annual Peaks for Predeveloped and Mitigated. POC #3 Rank Predeveloped Mitigated 1 0.6216 0.6216 2 0.6161 0.6161 3 0.5140 0.5140 4 0.5038 0.5038 5 0.4986 0.4986 6 0.4981 0.4981 7 0.4491 0.4491 8 0.4083 0.4083 9 0.4073 0.4073 20047_101920 11/4/2020 2:11:48 PM Page 25 10 0.3906 0.3906 11 0.3749 0.3749 12 0.3743 0.3743 13 0.3604 0.3604 14 0.3502 0.3502 15 0.3462 0.3462 16 0.3459 0.3459 17 0.3264 0.3264 18 0.3212 0.3212 19 0.3176 0.3176 20 0.3113 0.3113 21 0.3094 0.3094 22 0.3061 0.3061 23 0.3054 0.3054 24 0.3036 0.3036 25 0.3018 0.3018 26 0.2922 0.2922 27 0.2782 0.2782 28 0.2694 0.2694 29 0.2653 0.2653 30 0.2606 0.2606 31 0.2584 0.2584 32 0.2579 0.2579 33 0.2475 0.2475 34 0.2425 0.2425 35 0.2423 0.2423 36 0.2414 0.2414 37 0.2362 0.2362 38 0.2326 0.2326 39 0.2251 0.2251 40 0.2244 0.2244 41 0.2213 0.2213 42 0.2170 0.2170 43 0.2149 0.2149 44 0.2148 0.2148 45 0.2089 0.2089 46 0.1990 0.1990 47 0.1990 0.1990 48 0.1935 0.1935 49 0.1919 0.1919 50 0.1913 0.1913 51 0.1913 0.1913 52 0.1899 0.1899 53 0.1835 0.1835 54 0.1624 0.1624 55 0.1540 0.1540 56 0.1493 0.1493 20047_101920 11/4/2020 2:11:48 PM Page 26 Duration Flows The Facility PASSED Flow(cfs)Predev Mit Percentage Pass/Fail 0.1381 2189 2189 100 Pass 0.1428 1960 1960 100 Pass 0.1475 1720 1720 100 Pass 0.1521 1510 1510 100 Pass 0.1568 1368 1368 100 Pass 0.1615 1195 1195 100 Pass 0.1662 1047 1047 100 Pass 0.1709 954 954 100 Pass 0.1756 856 856 100 Pass 0.1802 760 760 100 Pass 0.1849 688 688 100 Pass 0.1896 611 611 100 Pass 0.1943 551 551 100 Pass 0.1990 517 517 100 Pass 0.2036 467 467 100 Pass 0.2083 412 412 100 Pass 0.2130 361 361 100 Pass 0.2177 326 326 100 Pass 0.2224 301 301 100 Pass 0.2271 280 280 100 Pass 0.2317 264 264 100 Pass 0.2364 239 239 100 Pass 0.2411 219 219 100 Pass 0.2458 207 207 100 Pass 0.2505 193 193 100 Pass 0.2552 181 181 100 Pass 0.2598 168 168 100 Pass 0.2645 155 155 100 Pass 0.2692 144 144 100 Pass 0.2739 129 129 100 Pass 0.2786 116 116 100 Pass 0.2832 104 104 100 Pass 0.2879 99 99 100 Pass 0.2926 90 90 100 Pass 0.2973 79 79 100 Pass 0.3020 73 73 100 Pass 0.3067 67 67 100 Pass 0.3113 62 62 100 Pass 0.3160 58 58 100 Pass 0.3207 55 55 100 Pass 0.3254 50 50 100 Pass 0.3301 47 47 100 Pass 0.3348 43 43 100 Pass 0.3394 39 39 100 Pass 0.3441 36 36 100 Pass 0.3488 33 33 100 Pass 0.3535 31 31 100 Pass 0.3582 30 30 100 Pass 0.3628 28 28 100 Pass 0.3675 26 26 100 Pass 0.3722 25 25 100 Pass 0.3769 23 23 100 Pass 0.3816 21 21 100 Pass 20047_101920 11/4/2020 2:11:48 PM Page 27 0.3863 21 21 100 Pass 0.3909 21 21 100 Pass 0.3956 20 20 100 Pass 0.4003 19 19 100 Pass 0.4050 18 18 100 Pass 0.4097 16 16 100 Pass 0.4144 16 16 100 Pass 0.4190 15 15 100 Pass 0.4237 15 15 100 Pass 0.4284 14 14 100 Pass 0.4331 14 14 100 Pass 0.4378 14 14 100 Pass 0.4425 14 14 100 Pass 0.4471 14 14 100 Pass 0.4518 13 13 100 Pass 0.4565 13 13 100 Pass 0.4612 13 13 100 Pass 0.4659 13 13 100 Pass 0.4705 13 13 100 Pass 0.4752 13 13 100 Pass 0.4799 12 12 100 Pass 0.4846 11 11 100 Pass 0.4893 11 11 100 Pass 0.4940 11 11 100 Pass 0.4986 11 11 100 Pass 0.5033 9 9 100 Pass 0.5080 8 8 100 Pass 0.5127 8 8 100 Pass 0.5174 6 6 100 Pass 0.5221 6 6 100 Pass 0.5267 6 6 100 Pass 0.5314 6 6 100 Pass 0.5361 6 6 100 Pass 0.5408 6 6 100 Pass 0.5455 6 6 100 Pass 0.5501 5 5 100 Pass 0.5548 5 5 100 Pass 0.5595 4 4 100 Pass 0.5642 4 4 100 Pass 0.5689 3 3 100 Pass 0.5736 3 3 100 Pass 0.5782 3 3 100 Pass 0.5829 3 3 100 Pass 0.5876 3 3 100 Pass 0.5923 3 3 100 Pass 0.5970 2 2 100 Pass 0.6017 2 2 100 Pass 20047_101920 11/4/2020 2:11:48 PM Page 28 Water Quality Water Quality BMP Flow and Volume for POC #3 On-line facility volume:0.1051 acre-feet On-line facility target flow:0.1223 cfs. Adjusted for 15 min:0.1223 cfs. Off-line facility target flow:0.0695 cfs. Adjusted for 15 min:0.0695 cfs. 20047_101920 11/4/2020 2:11:48 PM Page 29 LID Report 20047_101920 11/4/2020 2:11:48 PM Page 30 Model Default Modifications Total of 0 changes have been made. PERLND Changes No PERLND changes have been made. IMPLND Changes No IMPLND changes have been made. 20047_101920 11/4/2020 2:11:48 PM Page 31 Appendix Predeveloped Schematic 20047_101920 11/4/2020 2:11:50 PM Page 32 Mitigated Schematic Appendix 3 Soils Report Mountain Meadows Soils Report For Evaluating Site Feasibility of Stormwater Infiltration BMP’s Associated with Roof, Driveway and Road Runoff. Site Address: 8818 Burnett Road SE, Yelm WA 98597 TPN: 21713310400 Prepared For: Henrietta Morey PO Box 202 Kapowsin, WA 98344 Contact: Henrietta Morey (253) 377-8400 moreyrealestate@gmail.com Prepared By: Parnell Engineering, LLC 10623 Hunters Lane S.E. Olympia, WA 98513 Contact: William Parnell, P.E. (360) 491-3243 parnelleng@hotmail.com PE PARNELL ENGINEERING, LLC SOIL EVALUATION REPORT FORM l: GENERAL SITE INFORMATION PROJECTTITLE:MountainMeadows　　　　　　　　　　　　　　　　　　　　　　　　　　　　　SHEET:1OFl ` PEPROJEC丁NO∴20125　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　DATE:9/18/2020 PREPAREDBY:W冊amPa「neIi,P.E. 1.SiTEADDRESS:8818BumettRoadSE,YelmWA98597　TPN:21713310400 2.PROJECTDESCRIPTION:ProposedpIat. 3.SiTEDESCRIPTION:The2.89ac「eir「egula「shapedp「ojectsiteiscu「「entlyuno∞uPiedbyanybuiiding St「uCtu「eS.Site「eliefisgentIysIopingf「omeasttowest,Va「γingineIevationf「om340ft.atthenortheast P「OPe「tyCOme「tO328ft.aiongthewestp「opertyline.Sitevegetationconsistsofpastureg「assesandscotch bloomwithafewconifert「eesatthesouthwestp「opertyco「ne「.Theprojectsiteisboundedtothewestby Bu「nettRoadSEandresidentialp「opertytothenorth,eaStandsouth.Theon-Sitesoilsaremappedbythe Natu「alResourceConservationService(NRCS)asaweil-d「ainedSpanawayg「aveiIysandyloam(110) fo「medinvoicanicashovergrave=youtwash. 4.SUMMARYOFSOILSWORKPERFORMED:Twotestpitswe「eexcavatedbytrackhoetoamaximum depthof168’’beiowtheexistinggrade.Soilswe「einspectedbyente「ingandvisuallyloggingeachtestpitto adepthoffou「feet.SoiIsbeyondfourfeetwereinspectedbyexaminingbackhoetailings.Soiisampieswe「e takenfromtestpit#1and#2atlO8’’beIowtheexistinggrade.G「ainsizeanaIysismethodwasusedto dete「minethesuitab=ityofthe「ep「esentativesoiIhorizonsforstormwaterin凧t「ationfac冊es.Aninitial Satu「atedhyd「auIicconductivity(Ksat)wascaicuiatedandthenreducedbyco「「ectionfactors(CFT)to PrOduceanadjusteddesigninf冊「ation「ateKsatdesignforfac冊ysizingpu「poses.Testpitso旧ogdatasheets andg「ainsizeanaIysisdatawithKsatcaIculationsa「eincIudedinthis「eport. 5.ADDITIONALSOiLSWORKRECOMMENDED:Additionaisoilswo「kshouidnotbenecessa「y, 6.FINDiNGS:Theon-SitesoilsaremappedbyNRCSasaSpanawaygrave=ysandyloam(110).Testpits 「eveaIedsoiisconsistentofaSpanawayse「ieswithst「atumsoiisp「o輔ngave「yg「ave=yandcobbledfine SandyIoamove「lyinganext「emelygraveIiyandcobbledloamycoa「se高nesand.Winterwate「tabIewasnot PreSentandpossibIeindicatorswe「enotobvious.ThesoiIgrainsizeanaiysismethod「esuitedinadjusted KsatdesignvaluesforthefoiIowingsampIes:Testpit#1atlO8’’belowtheexistingg「ade-38.27in/hr,teStPit #2atlO8’’beIowtheexistinggrade-55.4in/hr. 7.RECOMMENDATIONS:TheSpanawayseriessoiisaresomewhatexcessivelydrainedsoiIsfoundon OutwaShpIainsfo「medinvoIcanicashoverg「ave=youtwash,in輔「ation「atesa「egeneraily「apidinthe SubstratumsoiIs.GrainsizeanaIysismethodresultedinadjustedKsatdesignvaiues>20in/h「.Fo「thetargeted Cho「izonsoiIs言tis「ecommendedKsatdesign(F)vaIuesdonotexceed20inlhr.Please「efe「totheattached SOiig「adationtest「esuItswithKsatdesigncaicuiations,aSSOCiatedindividualsoi=ogdatasheetsandtestpit/so旧og Iocationmap. Du「ingconst「uction,CaremuStbetakentop「eventthee「osionofexposedsoiIs.Sto「mwaterd「ainagefacility in輔「ationsu「facesmustbeproperIyprotectedfromcontaminationbythe血e-graineduppe「ho「izonsoiIs andfromcompactionbyconst「uctionsiteactivities.SoiIsnotp「operiyprotectedmaycausestormwate「 d「ainageinfilt「ationfac冊estonotperformasintended. Ihe「ebycertifythatIprepa「edthisreport,andconductedorsupervisedtheperfo「manceofreIatedwo「k"I 一醗雷の態繭〇〇〇葛"葛「-○○ SOIL EVALUATION REPORT FORM 2: SOIL LOG INFORMATION PROJECT TITLE: Mountain Meadows SHEET: 1 OF 2 PROJECT NO.: 20125 DATE: 9/16/2020 PREPARED BY: William Parnell, PE SOIL LOG: #1 LOCATION: 40 ft. north and 20 ft. east of the southwest property corner. (see attached site plan map) 1. TYPES OF TEST DONE: Grain size analysis 2. NRCS SOILS SERIES: Spanaway gravelly sandy loam (110) 3. LAND FORM: Outwash plain 4. DEPOSITION HISTORY: Volcanic ash over gravelly sand 5. HYDROLOGIC SOIL GROUP: A 6. DEPTH OF SEASONAL HW: Unknown 7. CURRENT WATER DEPTH: Greater than bottom of hole 8. DEPTH TO RESTRICTIVE HORIZONS: Greater than bottom of hole 9. MISCELLANEOUS: Gently sloping 10. POTENTIAL FOR: EROSION RUNOFF PONDING Slight Slow Minimal 11. SOIL STRATA DESCRIPTION: See Following chart 12. SITE PERCOLATION RATE: See FSP 13. FINDINGS & RECOMMENDATIONS: Roots were present to 60”. Use a design infiltration rate < 20 in/hr in the C horizon soils. Soils Strata Description Soil Log #1 Horz Depth Color Texture %CL %ORG CF STR MOT IND CEM ROO <X> FSP A 0”- 14” 10YR3/2 VGrCob SaLm some stones <15 <12 <45 1SBK - - - ff 2-6 4 Bw 14”- 18” 10YR3/4 VGrCob SaLm some stones <12 <8 <45 SG - - - ff 2-6 6 C1 18”- 60” 10YR5/4 ExGrCobC- FSa some stones <2 - <85 SG - - - ff >20 <20 C2 60”- 85” 10YR5/2 ExGrCobC- FSa some stones <2 - <85 SG - - - - >20 <20 C3 85”-168” 10YR5/2 ExGrcobM- FSa some stones <2 - <85 SG - - - - >20 <20 SOIL EVALUATION REPORT FORM 2: SOIL LOG INFORMATION PROJECT TITLE: Mountain Meadows SHEET: 2 OF 2 PROJECT NO.: 20125 DATE: 9/16/2020 PREPARED BY: William Parnell, PE SOIL LOG: #2 LOCATION: 40 ft. north and 80 ft. east of the southwest property corner. (see attached site plan map) 1. TYPES OF TEST DONE: Grain size analysis 2. NRCS SOILS SERIES: Spanaway gravelly sandy loam (110) 3. LAND FORM: Outwash plain 4. DEPOSITION HISTORY: Volcanic ash over gravelly sand 5. HYDROLOGIC SOIL GROUP: A 6. DEPTH OF SEASONAL HW: Unknown 7. CURRENT WATER DEPTH: Greater than bottom of hole 8. DEPTH TO RESTRICTIVE HORIZONS: Greater than bottom of hole 9. MISCELLANEOUS: Gently sloping 10. POTENTIAL FOR: EROSION RUNOFF PONDING Slight Slow Minimal 11. SOIL STRATA DESCRIPTION: See Following chart 12. SITE PERCOLATION RATE: See FSP 13. FINDINGS & RECOMMENDATIONS: Roots were present to 28”. Use a design infiltration rate < 20 in/hr in the C horizon soils. Soils Strata Description Soil Log #2 Horz Depth Color Texture %CL %ORG CF STR MOT IND CEM ROO <X> FSP A 0”- 20” 10YR3/2 VGrCob SaLm some stones <15 <12 <40 1SBK - - - ff 2-6 4 Bw 20”- 28” 10YR3/4 VGrCob SaLm some stones <12 <8 <50 SG - - - ff 2-6 6 C1 28”- 68” 10YR5/4 ExGrCobM- FSa some stones <2 - <85 SG - - - ff >20 <20 C2 68”-168” 10YR5/2 ExGrCobM- FSa some stones <2 - <85 SG - - - - >20 <20 Abbreviations Textural Class (Texture) Structure (STR) Grades of Structure Cobbled - Cob Granular - Gr Strong - 3 Stoney - St Blocky - Blky Moderate - 2 Gravelly - Gr Platy - Pl Weak - 1 Sandy - Sa Massive - Mas Loamy - Lm Single Grained - SG Silty - Si Sub-Angular Blocky - SBK Clayey - Cl Coarse - C Very - V Extremely - Ex Fine - F Medium - M Induration & Cementation (IND) (CEM) Weak - Wk Moderate - Mod Strong - Str Mottles (MOT) 1 Letter Abundance 1st Number Size 2nd Letter Contrast Few - F Fine - 1 Faint - F Common - C Medium - 2 Distinct - D Many - M Coarse - 3 Prominent - P Roots (ROO) 1st Letter Abundance 2nd Letter Size Few - f Fine - f Common - c Medium - m Many - m Coarse - c <X> - Generalized range of infiltration rates from NRCS soil survey (<X>) FSP - Estimated Design Field Saturated Percolation rate based on horizon specific factors and specific test results. MountainMeadows 1 90 80 くの ∽ の ∈70 」 ○ 言60 掌主50 D ⊂ 紛40 く○ ○. 宣30 のし20 10 0 C 」 i i l i I I N i i I　　　)　　　　　　　　　　　　l　　　　　　i TestPit♯1atlO8’. \ i ●　Sampiel i i l i l 100　　　　　　　10　　　　　　　1Samplel　　　O.1　　　　　　　0.01 i obb i GバブVel 上辺nd i　鋤 Coo糖e ん花柄朋　i　筋e Ksat Ca!culations Test pit#1 - SamPle #1 taken at lO8’’beiowthe existing grade Soil G「adation丁est Resuits: DlO　=　0.31 D60　=　8.5 D90　=19.0 簡nesこ　0.0117 loglO (Ksat) = -1.57 + 1.90 (DlO) + 0.015 (D60)一0.013 (D90)- 2.08 (怖nes) IoglO(K艶t)=-1.57十1.90(0.31)十0.015 (8.5)-0.013 (19.0主2.08(0.0117)=-1.1248 Ksat =　0.0750 cmIs Ksat=　0.0750 cm/s xO.3937 in/cm x60 s/min x60 min/h「 Ksat= 106.32 inIhr Final Desi0n Infi!tration Rate CalcuIation : Ksat desian Ksat design = Ksat initfal X CFT Ksa白nitiai = 106.32 in/h「 CFT (Total Co汀eCtion Facto「- July 2016 SWMM) = CFvx CFtx CFm CFv = 1.0 (two tests pits, nO SOil variabiiity〉 CFt = 0.4 (g「ain size method) CFm = 0.9 (S航ation & biofouling) CF丁=1.OxO.4xO.9 Ksat desisn = Ksat initfai X CFT Ksatdesisn = 106.32 in仙「x l.OxO.4xO.9 Ksatdesisn = 38.27 in/h「 For stormwate「 fac冊y design purposes, uSe a Ksat design㈲三20 in/h「 MountainMeadows 3I4　　3I8　　　4∴∴∴∴10　　　　20　　　40　　60　100　　200 100 90 80 ∽ のくo E70 ○ 言60 筆舌50 の ⊂ 総40 (o ⊂し宣30 α) 直20 10 0“ C \ i l )i i i l i " " 曇ト l 1 l )　　　i　　　　　　　　　　　　　　ll　l !TestPit#2atlO8.一 \ l・Samp-e2 " " " m m ○ 葛 S 喜 " 置暮菓 " m " S 喜 ○ " " " ○ 暮 ! I 100　　　　　　10　　　　　　　1Sample2　　　0.1　　　　-　0・01 bb G月ovel 上か〃d l　s′〃 Coa鵬e ん花dllm 」照ne Ksat Ca看cu看ations Test pit#2 - SamPIe #2 taken at lO8一一below the existing g「ade Soil G「adation丁est ResuIts: DlO =　0.35 D60　=　7.4 D90　=11.2 怖nes=　0.0128 loglO (Ksat) =一1.57 + 1.90 (DlO) + 0.015 (D60) - 0.013 (D90) -2.08 (ffines) iog「O (庵at)こ-1.57十1.90 (0.35)十0.015 (7.4)一0・013 (11・2) -2・08 (0・0128)こ-0・9662 Ksat=　0.1081 cm/s Ksat=　0.1081 cm/s x O.3937 in/cm x60 s/min x 60 min仙「 Ksat= 153.19 in/hr E吐宣IPesian In冊t「ation Rate Caicuiation : K8at desicIn Ksat design = Ksat initial X CFT KsatinitiaI = 153.19 in/hr CFT (Total Correction Factor - Juiy 2016 SWMM) = CFvx CFtxCFm CFv = 1.0 (two tests pits, nO SO= variabiirty) CFt = 0.4 (grain size method) CFm = 0.9 (S冊ation & biofouIing) CFT=1.OxO.4×0.9 Ksat design = Ksat initiaI X CFT Ksatdesign = 153.19 in川「× 1.O x O.4 xO.9 Ksatdesisn = 55.4 in仙r Fo「 stormwate「 fac岬y design purposes, uSe a Ksat desisn(F) ≦ 20 in仙星星星星星星 ∀M　　　　　　　　　　　　　　　M「]人 :曲塵皿瞭Idd- 一存灰汁7T￣　:Ⅱ∀0 ▲害すo齢▼○○劃す動きH ⊥Y「d▲日▼NI動1「さすd 　　　日量州か鳩舶陸棚1鴫格l蝿噌寝的￣剥調　　　蜘　強調りn櫨I蝕100櫨館腰山勘Ⅳ .飢7こ.し:「∀〇S :人80う納0ヨHO :人らiNM∀的 NV「d∃OYNIV曽q音o軸▼ S」議〇回V∃動軸i▼⊥Nno軸 ▲⊥i「i⊥∩　大鶴V軸iいi〃「ささd NolSいう轡〕⊥∀0 ●ON 画国書臆園田 \　　　　　　　そ〕 \　　　　　　　　　uつ // -1- OFFICE OF THE HEARING EXAMINER CITY OF YELM REPORT AND DECISION CASE NO.: SUB-05-0121-YL – Mountain Meadows APPLICANT: Henrietta Morey AGENT: Olympic Engineering SUMMARY OF REQUEST: The applicant is requesting preliminary plat approval to allow subdivision of approximately 4.88 acres into 23 single family residential lots. The property is zoned R6 Medium Density Residential, which allows up to 6 dwelling units per acre. SUMMARY OF DECISION: Request granted, subject to conditions. PUBLIC HEARING: After reviewing Planning and Community Development Staff Report and examining available information on file with the application, the Examiner conducted a public hearing on the request as follows: The hearing was opened on July 5, 2005. Parties wishing to testify were sworn in by the Examiner. The following exhibits were submitted and made a part of the record as follows: EXHIBIT "1" - Planning and Community Development Staff Report and Attachments TAMI MERRIMAN appeared, presented the Community Development Department Staff Report, and testified that the project is located in the R6 zone classification and that the applicant will retain the existing duplex located near Burnett Road. The balance of the site will consist of newly created single family lots. The internal plat roads to the north and east will be affected by the new bypass corridor and it is not feasible to connect them. They have required a road connection to the south. The Burnett subdivision will provide a -2- connector road, and the applicant must provide road improvements to the main plat road within said subdivision. The applicant proposes an underground stormwater system with open space on top. The stormwater drainage facilities will be located in a separate tract which the homeowners association must maintain. They cannot have a storm drainage easement, but must have a tract. All lots will have driveway access onto the new internal street which satisfies comprehensive plan policies. HENRIETTA MOREY appeared and testified that she has owned the property since 1978 and has planned for this subdivision for many years. She will develop the subdivision in accordance with conditions of approval. No one spoke further in this matter and so the Examiner took the request under advisement and the hearing was concluded. NOTE: A complete record of this hearing is available in the City of Yelm Community Development Department FINDINGS, CONCLUSIONS AND DECISION: FINDINGS: 1. The Hearing Examiner has admitted documentary evidence into the record, heard testimony, and taken this matter under advisement. 2. A Mitigated Determination of Nonsignificance was issued on May 31, 2005. 3. Notice of the date and time of the public hearing was published in the Nisqually Valley News in the legal notice section on Friday, June 24, 2005. 4. The applicant has a possessory ownership interest in a rectangular, 4.88 acre parcel of property abutting the east side of Burnett Road north of SR-510 within the City of Yelm. The parcel abuts Burnett Road for 329 feet and measures 666 feet in depth. The applicant proposes to subdivide the parcel into 22 single family residential lots, one duplex lot, and a storm drainage tract which will also provide open space. 5. The preliminary plat map shows an existing duplex structure located on proposed lot one which presently accesses onto Burnett Road. The duplex will remain on lot one, but will access from the new, internal plat road. A barn shown to the east of the duplex will be removed. Access to the site is provided via a single, internal plat road extending east from Burnett Road and turning to the south where it will connect with an internal plat road system of an abutting subdivision to the south. All lots will access onto the internal plat road. The applicant will install an underground infiltration stormwater system in Tract A located at the southeast corner of the intersection of the internal plat road and Burnett Road. The surface of Tract A will remain in open space. -3- 6. In addition to the recently approved subdivision abutting the south property line, surrounding uses include single family residential dwellings within unincorporated Thurston County to the west across Burnett Road, and undeveloped properties to the north and east. 7. The site is located within the Moderate Density Residential (R6) zone classification of the Yelm Municipal Code (YMC). Section 17.15.020(A) YMC authorizes single family residential dwellings and duplexes as outright permitted uses so long as the density does not exceed six dwelling units per gross acre and does not fall below three dwellings units per gross acre. The R6 classification contains no minimum lot size requirement. The preliminary plat proposes a density of 4.91 dwelling units per acre which is consistent with the R6 classification. Section 17.15.050 YMC requires setbacks of 25 feet from collector streets, 35 feet from arterials, and 15 feet from local streets. Minimum side yard setbacks must equal five feet and both side yard setbacks must total 12 feet. Rear yard setbacks must equal 25 feet and the maximum building area coverage cannot exceed 50%, of the lot and the maximum development coverage may not exceed 75% of the lot. The rectangular lots will allow a reasonably sized building pad for single family residential homes which can meet all required setbacks. The preliminary plat will comply with all bulk regulations of the R6 zone classification. 8. Chapter 14.12 YMC requires that a plat applicant dedicate a minimum of 5% of the gross area of the subdivision as usable open space. Open space uses may include environmental interpretation or education, parks, recreation lands, athletic fields, or foot paths/bicycle trails. The applicant’s open space tract of 10,350 square feet calculates to 5% of the gross area of the plat. The plat makes appropriate provision for open spaces, parks, and recreation, and playgrounds. 9. A mitigating measure in the MDNS issued pursuant to the authority of the State Environmental Policy Act (SEPA) requires the applicant to enter into a mitigation agreement with the Yelm School District to offset the impacts of school aged children residing in the plat on school services and facilities. Entry of such agreement will assure that the plat makes appropriate provision for schools and school grounds. 10. Traffic mitigation requires the applicant to improve the east half of Burnett Road along the property frontage to City standards for a neighborhood collector road. The applicant must also construct the internal plat road to City standards for a local access residential road. The applicant will also extend the internal plat road across the south property line to the internal plat road of the subdivision to the south. The applicant will construct the connecting internal road on the adjoining parcel. All lots including the duplex will access onto internal plat roads, and entering and stopping sight distance is available at the intersection of the internal plat road and Burnett Road. Conditions do not require extension of the internal plat road to parcels to the -4- north and east as such parcels will support the SR-510 Yelm loop corridor. The plat makes appropriate provision for streets, roads, alleys, and other public ways. 11. The City of Yelm will provide both domestic water and fire flow to the site. The applicant will extend the water line which currently terminates at its south property line to the north property line of the site. The City will also provide sanitary sewer service to all lots and the applicant will extend the existing sewer line from the south property line to the north property line of the parcel. The plat makes appropriate provision for potable water supplies and sanitary waste. 12. The applicant will construct curbs, gutters, and sidewalks on both sides of the internal plat road and along the east side of Burnett Road across the plat frontage. The applicant must also install adequate street lighting to ensure safety to pedestrians, vehicles, and homeowners. The plat makes appropriate provision for safe walking conditions. CONCLUSIONS: 1. The Hearing Examiner has jurisdiction to consider and decide the issues presented by this request. 2. The applicant has established that the request for preliminary plat approval is consistent with the R6 zone classification of the YMC and meets all development criteria of the YMC. 3. In accordance with Section 16.12.170 YMC the preliminary plat makes appropriate provision for the public health, safety, and general welfare for open spaces, drainage ways, streets, roads, alleys, transit stops, potable water supplies, sanitary waste, parks and recreation, playgrounds, schools and school grounds, and safe walking conditions. 4. The proposed preliminary plat will serve the public use and interest by providing an attractive location for a single family residential subdivision and therefore should be approved subject to the following conditions: 1. The proponent shall comply with the mitigation requirements of the MDNS issued on May 31, 2005, which includes: a. The proponent shall mitigate transportation impacts based on the new residential P.M. peak hour trips generated by the project. The Transportation Facility Charge (TFC) shall be based on 1.01 new peak hour trips per residential unit. The proponent will be responsible for a TFC of $757.50 per dwelling unit which is payable at time of building permit. Credit should be given for the existing multi-family dwelling. -5- b. Prior to final subdivision approval, the proponent shall complete the following transportation improvements: i. The east half of Burnett Road shall be improved to City Standards for a Neighborhood Collector along the property frontage. ii. All interior streets shall be improved to City Standards for a Local Access Residential. iii. The interior street shall be connected to the right-of-way provided to the south, with full street improvements completed to 89th Street. The cost of these improvements shall be the responsibility of the developer. c. The driveway entrance to the existing duplex shall be located on the new interior street. d. Temporary erosion control systems to be approved by the City of Yelm. e. The proponent shall provide at least 5% of total acreage as qualified open space. f. The proponent shall enter into an agreement with Yelm Community Schools to mitigate project impacts to the School District. 2. Each dwelling unit with the subdivision shall connect to the City water system. The connection fee and meter fee will be established at the time of building permit issuance. The existing well shall be abandoned per Washington State Department of Ecology standards. Any water rights associated with the well shall be deeded to the City of Yelm. 3. All conditions for cross connection control as required in Section 246-290-490 WAC. 4. All planting strips and required landscaping located within any open space, stormwater tract, and along Burnett Road shall be served by an irrigation system with a separate water meter and an approved backflow prevention device. 5. Each dwelling within the subdivision shall connect to the City S.T.E.P. sewer system. The connection fee and inspection fee will be established at the time of building permit issuance. Existing septic systems shall be abandoned per the Thurston County Department of Health standards. 6. The proponent shall design and construct all stormwater facilities in accordance with the 1992 DOE Stormwater Manual, as adopted by the City of Yelm. Best Management Practices (BMP’s) are required during construction. A 10-foot setback from all property lines and easements are required for stormwater facilities. -6- 7. The stormwater plan shall be submitted with civil engineering plans and shall include an operation and maintenance plan. 8. Storm water treatment facilities shall be located in a separate recorded tract owned and maintained by the homeowners association. 9. All roof drain runoff shall be infiltrated on each lot utilizing individual drywells. 10. The stormwater system shall be held in common by the Homeowners Association. The Homeowners Agreement shall include provisions for the assessment of fees against individual lots for the maintenance and repair of the stormwater facilities. 11. The proponent shall submit a fire hydrant plan to the Community Development Department for review and approval as part of the civil engineering plans prior to final subdivision approval. 12. The proponent shall submit fire flow calculations for all existing and proposed hydrants. All hydrants must meet minimum City standards. 13. The proponent shall be responsible for the installation of hydrant locks on all fire hydrants required and installed as part of development. The proponent shall coordinate with the Yelm Public Works Department to purchase and install required hydrant locks. 14. Street lighting will be required. Civil plan submittal shall include a lighting design plan for review and approval. 15. Prior to the submission final plat application, the proponent will provide the Community Development Department an addressing map for approval. 16. Prior to final plat application, a subdivision name must be reserved with the Thurston County Auditor’s Office. 17. The proponent shall submit a final landscaping and irrigation plan with the civil engineering plans to include the perimeter of the project site, planter strips, and stormwater facilities. 18. The proponent shall provide a performance assurance device in order to provide for maintenance of the required landscaping until the tenant or homeowners’ association becomes responsible for landscaping maintenance. The performance assurance device shall be 150 percent of the anticipated cost to maintain the landscaping for three years. 19. The decision set forth herein is based upon representations made and exhibits, including plans and proposals submitted at the hearing conducted -7- by the hearing examiner. Any substantial change(s) or deviation(s) in such plans, proposals, or conditions of approval imposed shall be subject to the approval of the hearing examiner and may require further and additional hearings. 20. The authorization granted herein is subject to all applicable federal, state, and local laws, regulations, and ordinances. Compliance with such laws, regulations, and ordinances is a condition precedent to the approvals granted and is a continuing requirement of such approvals. By accepting this/these approvals, the applicant represents that the development and activities allowed will comply with such laws, regulations, and ordinances. If, during the term of the approval granted, the development and activities permitted do not comply with such laws, regulations, or ordinances, the applicant agrees to promptly bring such development or activities into compliance. DECISION: The request for preliminary plat approval for the Henrietta Morey subdivision is hereby granted subject to the conditions contained in the conclusions above. ORDERED this 20th day of July, 2005. _____________________________________ STEPHEN K. CAUSSEAUX, JR. Hearing Examiner TRANSMITTED this 20th day of July, 2005, to the following: APPLICANT: Henrietta Morey P.O. Box 202 Kapowsin, WA 98344 AGENT: Olympic Engineering 1252 Devon Loop NE Olympia, WA 98506 City of Yelm Tami Merriman 105 Yelm Avenue West P.O. Box 479 -8- Yelm, Washington 98597 -9- CASE NO.: SUB-05-0121-YL – MOUNTAIN MEADOWS NOTICE 1. RECONSIDERATION: Any interested party or agency of record, oral or written, that disagrees with the decision of the hearing examiner may make a written request for reconsideration by the hearing examiner. Said request shall set forth specific errors relating to: A. Erroneous procedures; B. Errors of law objected to at the public hearing by the person requesting reconsideration; C. Incomplete record; D. An error in interpreting the comprehensive plan or other relevant material; or E. Newly discovered material evidence which was not available at the time of the hearing. The term “new evidence” shall mean only evidence discovered after the hearing held by the hearing examiner and shall not include evidence which was available or which could reasonably have been available and simply not presented at the hearing for whatever reason. The request must be filed no later than 4:30 p.m. on August 3, 2005 (10 days from mailing) with the Community Development Department 105 Yelm Avenue West, Yelm, WA 98597. This request shall set forth the bases for reconsideration as limited by the above. The hearing examiner shall review said request in light of the record and take such further action as he deems proper. The hearing examiner may request further information which -10- shall be provided within 10 days of the request. 2. APPEAL OF EXAMINER'S DECISION: The final decision by the Examiner may be appealed to the city council, by any aggrieved person or agency of record, oral or written that disagrees with the decision of the hearing examiner, except threshold determinations (YMC 15.49.160) in accordance with Section 2.26.150 of the Yelm Municipal Code (YMC). NOTE: In an effort to avoid confusion at the time of filing a request for reconsideration, please attach this page to the request for reconsideration. RECORD OF SURVEY FOR VICINITY MAP Henrietta Morey BOUNDARY LINE ADJUSTMENT O SITE A PORTION OF THE NE 1/4 OF THE SW 1/4 SECTION 13, TOWNSHIP 17 NORTH, RANGE 1 EAST OF THE W.M., 891H AE SE so o so too iso CITY OF YELM, THURSTON COUNTY, WASHINGTON GRAPHIC SCALE - FEET REFERENCE MATER/ALS LEGEND BASIS OF BEARING- HELD S 8835'i2"E ALONG THE N.T.S. NORTH LINE OF LOTS 1 AND 2 AS SHOWN ON SHORT di SUBDIVISION NO. SS-2414 1. THURSTON CO. AERIAL AND ASSESSOR MAP FOR SECTION $ FOUND MONUMENT IN CASE OR PLAT MON 13-17N-7E, W.M. 2. ALTA COMMITMENT FOR TITLE INSURANCE. CHICAGO 0 CALC. PLAT POSITION NOTHING FOUND OR SET TLEd60013377 LISTING COMMITMENT DATED JULY O EX/ST. REBAR & CAP, S SET 5/8" REBAR AND CAP STAMPED "LS 19628" J. THE FOLLOWING DOCUMENTS ARE RECORDS OF THE PIERCE SET MAG SPlKE REVISED POB SP 2414 SURVEYOR'S NOTES PAR. "An PLAT OF BURNETT ESTATES AGREEMENT AFN 4558460 1. DATE VISITED SITE AND MONUMENTS: SEPT, 2016 POB EXCEPTION I JO' PER DEDICATION LLD-0466 LOT 1 REVISED DEED AF NO. 8803280091 VOL. 3, PAGE 238 2. SURVEY INSTRUMENT USED: LEICA GPS 1250 PAR. "B -- S 8835'i2"E 448.12. AF NO. 8803210055 CALC. POSITION PER I ' (3... SS-2414 / 1 , J. FIELD METHOD USED: FIELD TRAVERSE. g 20 20 136.12' 114.00, 864.12 198.co' 7 3 I 4. THIS SURVEY COMPLIES WITH ALL STANDARDS AND GUIDELINES I OF THE "SURVEY RECORDING ACT" CHAPTER 58.09 RCW AND PARCEL "A" REVISED LINE 332-130 WAC. I 0.496 ACRES 5. THE BOUNDARY LINE POSITIONING AS SHOWN WAS CALCULATED BY T.L.K. FROM RECORD DATA AND FIELD LOCATIONS. BARN 6. SEPTIC DRAINFIELD 20' X 80' EASEMENT LOCATED ON PARCEL "B" FOR PARCEL "B" BENEFIT OF PARCEL "A" TO BE VACATED ON PARCEL "B" OR LOT 1,2 OR J OF (FUTURE DEVELOPMENT) THURSTON COUNTY SHORT PLAT 2414 DEVELOPMENT REQUIRING PARCEL "A" TO 2.895 ACRES HOOK UP TO CITY OF YELM SEWER LOCATED ON BURNETT ROAD SE THE COST o I-+--SEPTIC DRAINFIELD OF WHICH SHALL BE BORNE BY THE OWNER/DEVELOPER OF PARCELS "B" OR UPL (SEE SURVEYOR'S LOT 1,2, OR J OF SS 2414. PARCEL"A" TO ALLOW UNIMPEDED ACCESS FOR / NOTE 6) SAID HOOK UP WORK. 7. 100' WELL RADIUS BENEFITING PARCEL "A" AND ENCUMBERING PARCEL "B" TO SS-2414 tor BE VACATED ON PARCEL "B" OR LOT 1,2 OR J OF SS 2414 DEVELOPMENT ELL ,~ VOL.25, PAGE 244 REQUIRING PARCEL "A" TO HOOK UP TO CITY OF YELM WATER LOCATED ON " . A.F. NO 9107050017 PARCEL NO BURNETT ROAD SE, THE COST OF WHICH SHALL BE BORNE BY THE 21713310402 OMIER/DEVELOPEREOF PARCELU "B" OORKLOT 1,2, OR J OF SS 2414. PARCEL TL O 1\ REVISED LINE 1 1 8. AT THE TIME OF DEVELOPMENT OF PARCEL "8" OR LOT 1,2, OR 3 OF SS 2414, LOT 2 THE CURRENT DRIVEWAY ACCESS TO PARCEL "A" SHALL BE RELOCATED FROM o 100' WELL ITS CURRENT LOCATION ON BURNETT ROAD SE TO THAT REQUIRED BY THE o RADIUS (SEE PARCEL NO. CITY OF YELM, THE COST OF WHICH IS TO BE BORNE BY OWNER/DEVELOPER SURVEYOR'S PARCEL NO. 21713310400 OF PARCEL "B" OR LOT 1,2 OR J OF SS 2414. NOTE 7) 21713310401 / 9. AT TIME OF DEVELOPMENT, OWNER/DEVELOPER OF PARCEL "B" OR LOT 1,2, OR DRIGINAL LINE 3 OF SS 2414 SHALL BE RESPONSIBLE FOR ALL DECOMMISSIONING OF PARCEL ----- ----- "A'S" CURRENT SEPTIC SYSTEMS AND WELL, TOGETHER WITH ALL COST ASSOCIATED THERETO. 20' PER DEDICATION Approved fo 10. SHOULD PARCEL "A" DESIRE OR BE COMPELLED BY A GOVERNMENT AUTHORITY TO CONNECT TO CITY OF YELM SEWER AND WATER BEFORE DEVELOPMENT OF DEED AF NO. 9107120032 GCOrd PARCEL "B" OR LOT 7,2, OR J OF SS 2414, THEN OWNER OF PARCEL "A" SHALL BEAR ALL DUTIES AND COSTS IN FACILITATING SUCH DECOMMISSIONING ----- -------- OF CURRENT SYSTEMS AND HOOK UPS TO CITY OF YELM SERVICE LINES. SAID ------- ---------- . .... ..... WELL AND SEPTIC ELIMINATION SHALL EXTINGUISH THE SEPTIC ORAINFIELD ESM'T FOR INGRESS, EGRESS & . EASEMENT AND WELL RADIUS ENCUMBERED ON PARCEL "B" OR LOT 1,2 OR J 20 20 Fo UTILITIES, PER SS-2414 o OF SS 2414. 249.80' / if. NOTES 6-10 SUBJECT TO AGREEMENT UNDER AFN 4558460 198.00' S 8834'40"E 447.80 )1 ) I - JO' PER DEDICATION DEED 1 STORM AF NO. 9404210272 TRACT A 8 PLAT OF BURNETT ESTATES ...... THURSTON COUNTY HEALTH OFFICERno SHEET INDEXING - --- ---- EXAMINED AND APPROVED THIS DAY OF , 2017. 2 3 4 OPTERNACSTPABCE 5 6 SHEET 1 OF 2 - SURVEY DRAWING 7 q4,py,, wAt'p NOTES & REFERENCES THURSTON COUNTY HEALTH OFFICER S 8834'O4"E 510.02. SHEET 2 OF 2 - REVISED AND ORIGINAL 89TH AVE. SE LEGAL DESCRIPTIONS BOUNDARY LINE ADJUSTMENT # BLA- 14- 0 $55 - /1- AUDITOR'S CERTIFICATE SURVEYOR'S CERTIFICATE e . .>.? T. L. K. Land PREPARED FOR: HENRIETTA MOREY 4. of ' PO BOX 202 FILED FOR RECORD THIS 3 DAY OF M 4 20 1 THIS MAP CORRECTLY REPRESENTS A SURVEY MADE BY ME OR UNDER : Surveyors LLC KAPOWSIN, WA. 98344 AT .M. UNDER AUDITOR'S FEE NO. A1 1 MY DIRECTION IN CONFORMANCE WITH THE REQUIREMENTS OF THE SURVEY : AT THE REQUEST OF THOMAS L. KERTH, PLS RECORDING ACT AT THE REQUEST HENRIETTA MOREY. * : 2606 East Main Avenue IN SEPT 201 ORAWN BY: DATE: JOB NO.: . 1 p Puyallup, Washington 98372 IsT ..' S. KERTH SEPT,2016 16-829 CHECKED BY: SCALE: SHEET: DEPUTY AU 1 0 COUNTY AUD R CERTIFICATE NO. 19628 EXPIRES PHOne: (253)841-3953 Fax: (253)841-7249 T. KERTH 1" =50" 1 OF 2 RECORD OF SURVEY FOR Henrietta Morey BOUNDARY LINE ADJUSTMENT A PORTION OF THE NE 1/4 OF THE SW 1/4 SECTION 13, TOWNSHIP 17 NORTH, RANGE 1 EAST OF THE W.M., CITY OF YELM, THURSTON COUNTY, WASHINGTON ORIGINAL LEGAL DESCRIPTION REVISED LEGAL DESCRIPTION BEING A PORTION OF THE NORTHEAST QUARTER OF THE SOUTHWEST QUARTER OF SECTION 13, TOWNSHIP 17 NORTH, RANGE Of EAST OF THE PARCEL "A" W. M. THAT PORTION OF LOT 1 OF SHORT SUBDIVISION NO. SS-2414 AS PARCEL "A" TAX PARCEL NO. 21713310401 RECORDED JULY 05, 1991 UNDER RECORDING NO. 9107050017 RECORDS OF THURSTON COUNTY, WASHINGTON, MORE PARTICULARLY DESCRIBED AS LOT 1 OF SHORT SUBDIVISION NO. SS-2414, AS RECORDED JULY 05, 1991 FOLLOWS. UNDER RECORDING NO. 9107050017 RECORDS OF THURSTON COUNT,Y WASHINGTON. BEGINNING AT THE NORTHWEST CORNER OF SAID LOT 1; THENCE ALONG THE NORTH LINE THEREOF SOUTH 88035'12'EAST 136.12 FEET; THENCE SUBJECT TO AND TOGETHER WITH EASEMENTS, RESTRICTIONS AND/OR RESERVATIONS OF RECORD SOUTH 01o25'i9"WEST 158.34 FEET; THENCE NORTH 88oJ4'47"WEST 136.48 FEET TO THE EAST RIGHT OF WAY MARGIN OF BURNETT ROAD SE AS CONTAINING 1.89 ACRES OF LAND, MORE OR LESS, AS SHOWN ON SAID DEDICATED ON SAID SHORT SUBDIVISION NO. SS-2414; THENCE ALONG SS-2414 SAID RIGHT OF WAY NORTH 01033'O4'EAST 158.32 FEET TO THE POINT OF BEGINNING. PARCEL '8" TAX PARCEL NO. 21713310400 SUBJECT TO AND TOGETHER WITH EASEMENTS, RESTRICTIONS ANO/OR LOT 2 OF SHORT SUBDIVISION NO. SS-2414 AS RECORDED JULY 05, 1991 RESERVATIONS OF RECORD, INCLUDING THOSE IN SURVEYORS'S NOTES OF UNDER RECORDING NO. 9107050017 RECORDS OF THURSTON COUNTY, HENRIETTA MOREY BOUNDARY LINE ADJUSTMENT MAP. WASHINGTON. CONTAINING 0.495 ACRES OF LAND, MORE OR LESS SUBJECT TO AND TOGETHER WITH EASEMENTS, RESTRICTIONS AND/OR RESERVATIONS OF RECORD. PARCEL '8" CONTAINING 1.50 ACRES OF LAND, MORE OR LESS, AS SHOWN ON SAID SS-2414. LOTS 1 & 2 OF SHORT SUBDIVISION NO. SS-2414, AS RECORDED JULY 05, 1991 UNDER RECORDING NO. 9107050017 RECORDS OF THURSTON COUNTY, WASHINGTON. EXCEPT THAT PORTION OF SAID LOT 1, MORE PARTICULARLY AS DESCRIBED AS FOLLOWS: BEGINNING AT THE NORTHWEST CORNER OF SA/O LOT 1; THENCE ALONG THE NORTH LINE THEREOF SOUTH 88oJ5'12"EAST 136.12 FEET: THENCE SOUTH 01o25'i9"WEST 158.34 FEET; THENCE NORTH 88034'41"WEST 136.48 FEET TO THE EAST RIGHT OF WAY MARGIN OF BURNETT ROAD SE AS DEDICATED ON SAID SHORT SUBDIVISION NO. SS-2474; THENCE ALONG SAID RIGHT OF WAY NORTH OfoJJ'O4'EAST 158.32 FEET TO THE POINT OF BEGINNING. SUBJECT TO AND TOGETHER WITH EASEMENTS, RESTRICTIONS AND/OR RESERVATIONS OF RECORD, INCLUDING THOSE IN SURVEYOR'S NOTES OF HENRIETTA MOREY BOUNDARY LINE ADJUSTMENT MAP. CONTAINING 2.895 ACRES OF LAND, MORE OR LESS, -o S . one EXPIRES SHEET 2 OF 2 *ADD NOTE 11 AND REF. STK 4/25/17 T. L. K. Land *MASDE MINOR 1C70RRECTIONS NOTE Surveyors, LLC ADD HEALTH DEPT BLOCK Puyallup, Washington 98372 STK 3/22/17 * CITY COMMENTS & ADD PG2 STK 3/13/17 Phone: (253)841-3953 Fax: (253)847-7249 1 Tami Merriman From:parsonst192@gmail.com Sent:Monday, November 30, 2020 12:59 PM To:Tami Merriman Subject:[External]Mountain Meadows- 8818 Burnett Rd SE Good afternoon Tami, My name is Taryn Ehlig, I’m a resident living off of 89th Ave SE. I just saw the notice of application for the Mountain Meadows development and I had a concern about how this would affect traffic along Burnett Rd. It’s already a fairly busy and narrow road. There’s a paved walking trail along SR 510 that is actively used by those of us living in the area, but really no sidewalk to safely access the trail between 89th Ave and 510 along Burnett. Is there any plans for improvement along Burnett, particularly in regards to stretching the sidewalk from 510 to the new residential area? There is a trail access on 89th at Mountain View Rd. With the new neighborhood going in, I’m concerned we’ll see more foot traffic and bicycles along Burnett as I’m sure some of the new residents would also like to enjoy that trail. Thank you so much for your time! Taryn Ehlig 253-459-4712 Sent from my iPhone