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Response to Rev 1 Comments 001 November 21, 2007 Mr. Jim Gibson City of Velm Community Development Department 105 Yelm Avenue West P.O. Box 479 Yelm, WA 98597 Subject Tahoma Terra Fairway Multi Family - SPR 05-0750-YL Revised Site Construction Drawings Mr. Gibson: KPFF has received the comments from your letter dated October 4, 2007. We have addressed the issues you presented and our response is outlined below: STORM DRAINAGE REPORT: 1. Comment noted. 2. Storm Drainage Report Section 3 -The soils report was revised to clarify the recommended infiltration rates for the targeted soils. The infiltration rate used for the design was 1 inch/hour. Per the 2005 LID Manual, these soils will be adequate as a water quality device. Therefore, a separate separation and water quality treatment layer is not needed. 3. Erasion Control Plan - A section has been added in Section 2 to address sedimentation and maintenance of the pervious pavement. 4. Storm Drainage Report Appendix 1 -The 2005 DOE Manual and the 2005 LID Manual were used for the design. 5. Storm Drainage Report Appendix 1 -The 2005 DOE and LID Manuals require the use of WWHM, therefore, "f" is no longer included in the calculation section. 6. Storm Drainage Report Appendix 1 -Storm Shed is no longer being used for storm drainage calculations. WWHM calculations are included in the report. 7. Storm Drainage Report Appendix 1 -Per the 2005 LID Manual, the existing soils will be adequate as a water quality device. Therefore, a separate separation and water quality treatment layer is not needed. 8. Storm Drainage Report Appendix 1 - A summary of the storage volume calculations have been provided. The WWHM modeling information has also been provided. 9. Storm Drainage Report Appendix 1 -The WWHM output information forthe sediment traps is provided. a200 blh Avenue SE, Sui(e 309 Lacey, WA 88503 r960) 18P-119e Fax f960) 292J231 Seattle Everett Taaoma Lacey PortlanC Fupene San Fmncltco Searemenfo Lot Anpeba Yaaaeena Irvine San Olego YAwnli Oanret Sf. Lauls MrJim Gibson November 21, 2007 Page 2 of 4 10. Storm Drainage Report Appendix 1 -The 2005 DOE Manual was used to size the sediment traps. 11. Storm Drainage Report Appendix 2 -This comment is addressed in Part 1, Section 1 of the Storm Drainage Report. 12. Storm Drainage Report Appendix 5 -The revised soils report including a clear recommendation of infiltration rates is included. CONSTRUCTION PLANS: 13. Comment noted. 14. Conditions of Approval have been added to cover. 15. The proposed pathways will connect to the proposed Habitat Trail. The path no longer conflicts with the proposed retaining wall. Slopes for the proposed pathways are also shown on Sheet 4(C3.0). 16. The pocket park is located in the northwest corner of the site. 17. The pavement marking information is located on Sheet 6 (C 4.0). 18. The call-outs for sidewalks with dimensions are shown on Sheet 6 (C4.0). 19. The access from Terra Valley has been re-designed per City of Yelm. 20. Curb ramps and WSDOT details are shown on Sheet 8 (C 4.2j. 21. Dumpster locations have been called out on the plans. 22. The approved mailbox cluster location is called out on the plans. The Yelm Postmaster's approval is attached to this letter. 23. Edge of pavement is depicted on the plans. 24. Chain link fencing in the tree protection areas is now shown on Sheet 4 (C3.0). The fence detail is shown on Sheet 5 (C3.1). 25. The sediment trap has been relocated. 26. The interceptor swales have been relocated. They will not impact the buffer. 27. The slopes of the interceptor swales are shown on Sheet 4 (C3.0). 28. This sheet is now included in the plan set. 29. Please see the drainage report Section 1, Part 1 regarding the pavement section. 30. The area between Building #2 and #3 has been re-graded. 31. All proposed contours have been labeled. 32. The roof drainage pipes are shown on Sheet 10 (C5.1). 33. The proposed pathways and associated slopes are shown on Sheet 4 C3.0). 34. The access road design has been revised and will no longer impact the wetland buffer. Mr. Jim Gibson November 21, 2007 Page 3 of 4 35. The reserve area for emergency stormwater and proposed conveyance is now shown on the Horizontal Control Plan Sheet 10 (C5.1). 36. The separation distance between water and sewer is shown. 37. Water plans have been revised to provide minimum cover of 42 inches. 38. There is no horizontal deflection and minimal vertical deflection that is typical of water line construction. 39. Proposed fire hydrants and fire department connections have been relocated to the edge of the drive lane at each building. 40. City of Yelm standard detail 6-4 is located on sheet. 41. The domestic and fire service have been updated on the plan. 42. Post Indicator valves are shown on plans. 43. Fire line sizes are indicated on plans. 44. Domestic water line, water meter and backflow prevention device sizes are all shown on plans. 45. The proposed utility easement has been labeled. 46. Connection types for all fittings are shown on plans. 47. Note #2 has been corrected. 48. Agate valve has been added to the Tee at Note 17. 49. Comment noted on Water Plan Sheet 9, (C6.0). 50. The Coot Company will prepare a report regarding the water line trenching impacting the wetland buffer. 51. Thrust blocks are shown at all fittings and in-line valves. 52. STEP pipe length is shown on the STEP profiles. 53. Agate valve has been added at the connection to the existing sewer main. 54. An Air Release Assembly has been added at the high point of the main. 55. An End of Line Clean Out has been added at the end of the main line. 56. The service connection detail has been added to Sheet 20 (C7.3). 57. The STEP Table has been updated. 58. Pump Control Panel locations are shown on the plans. 59. Hose Bib locations are shown on the plans. 60. All side sewers and clean outs are shown on the sewer plans. 61. The plan has been revised so side sewers enter at the ends of the tanks. 62. This error has been corrected. 63. Landscaping and irrigation plans have been added to the sheet. Mr. Jim Gibson November 21, 2007 Page 4 of 4 Mr. Gibson, should you have any questions, or need additional information, please give me a call at (360) 292-7230, ore-mail nancv whalev@koff com. Sincerely, ~~ ~~ Nancy M. Whaley Design Engineer NMW:mh Enclosures 406032.03