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Home My WebLink About09 MLA17-00019 RESPONSE TO STORMWATER MANAGEMENT PLANNING STREAMLINE ENVIRONMENTAL 715 Grant Street • Port Townsend,Washington 98368 Phone(360)821-9960 • www.streamlineenv.com April 11,2017 Mr. John Fleming, P.E. Jefferson County Public Works Engineer 623 Sheridan St Port Townsend, WA 98368 Via e-mail: jfleming@co.jefferson.wa.us Re: Stormwater Management Planning Austin Smiths PropertyREITZ 9272 Flag ler Road Nordland, WA 98358 Jefferson County Parcel Number 021204015 JEFF 317,948 SF (7.299 acres) ER SON 1C(1�(fiy�. �� BLD 17-00093 Dear Mr. Fleming, Thank you for reviewing our stormwater management plans for the referenced site. We have revised County stormwater forms, and our overall stormwater plan(all attached) as follows: • We revised the Stormwater Calculation Worksheet (attached) to show the correct parcel area, 317,948 SF (7.299 acres). • Based on County Figure 1: New Development (Figure 2.4.1 from the 2014 SWMMWW, Volume 1, page 2-5); with less than 35% existing impervious coverage, and more than 5,000 SF of new impervious surface, this project is clearly a"Large" Project, and therefore requires us to address all ten minimum stormwater management requirements: 1. Preparation of Stormwater Site Plans 2. Construction Stormwater Pollution Prevention 3. Source Control of Pollution 4. Preservation of Natural Drainage Systems and Outfalls 5. On-site Stormwater Management 6. Runoff Treatment 7. Flow Control 8. Wetlands Protection 9. Basin/Watershed Planning 10. Operation and Maintenance LOG ITEM Page 2 • The applicant's Stormwater Site Plan Submittal Template (attached) has been corrected to reflect full on-site dispersion rather than infiltration. The ten minimum stormwater management requirements are addressed within the Template. We have added discussions of Environmentally Sensitive Areas (ESAs) including wetlands and the DNR stream, and have added the approximate extent of wetlands to the site plan. • Approximate dimensions of native and non-native vegetation have been added to our site plan. • We have determined the minimum required width of native vegetation in the proposed full dispersion flow path to be 75 ft. As outlined in the SWMMWW Volume 5, page 5-37, the required flow path must be three times this width,or 225 ft. We have outlined a 75 ft wide by 225 ft long full dispersion flow path through mostly native vegetation on the site plan, and • Mr. Smith is prepared to grant a stormwater protection easement using the attached (uncompleted) STORMWATER MANAGEMENT FACILITY MAINTENANCE AGREEMENT. Section 2.0 of this agreement references our proposed 75'x225' Preserved Area is shown on the Site Plan with Existing Conditions and Proposed Stormwater Management Feature (April 10, 2017, by Streamline Environmental), attached. Once approved by your office,the applicant will mark the proposed Preserved Area in the field prior to construction activities. Please feel free to contact me directly if you have questions. Thank you for your assistance. Sincerely, AL Stre. -)ine ynvironmental, Inc. p40e."C S 64,4 Everett:Sorensen, P.E. •` ¢' ,1 ��'_ Principal Engineer (360) 821-9960 otp.t'•so everett@streamlineenv.com - s!9- 4//// (7 , A Attachments: Site Plan with Existing Conditions and Proposed Stormwater Management Features (Revised) CSPPP and TE&SC Notes (unchanged) Stormwater Calculation Worksheet(Revised) Stormwater Site Plan Submittal Template (Revised) STORMWATER MANAGEMENT FACILITY MAINTENANCE AGREEMENT Copies to: Mr. Austin Smith; via e-mail: smithad206@icloud.com Mr. Patrick Hopper,DCD;hard copy and via e-mail: PHopper@cojefferson.wa.us LOG ITEM Par:. 2 _O 2- STREAMLINE ENVIRONMENTAL 715 Grant Street • Port Townsend,Washington 98368 Phone(360)821-9960 • www.streamlineenv.com April 11,2017 Mr. John Fleming, P.E. Jefferson County Public Works Engineer 623 Sheridan St Port Townsend, WA 98368 Via e-mail: jfleming@co.jefferson.wa.us Re: Stormwater Management Planning Austin Smiths PropertyREITZ 9272 Flag ler Road Nordland, WA 98358 Jefferson County Parcel Number 021204015 JEFF 317,948 SF (7.299 acres) ER SON 1C(1�(fiy�. �� BLD 17-00093 Dear Mr. Fleming, Thank you for reviewing our stormwater management plans for the referenced site. We have revised County stormwater forms, and our overall stormwater plan(all attached) as follows: • We revised the Stormwater Calculation Worksheet (attached) to show the correct parcel area, 317,948 SF (7.299 acres). • Based on County Figure 1: New Development (Figure 2.4.1 from the 2014 SWMMWW, Volume 1, page 2-5); with less than 35% existing impervious coverage, and more than 5,000 SF of new impervious surface, this project is clearly a"Large" Project, and therefore requires us to address all ten minimum stormwater management requirements: 1. Preparation of Stormwater Site Plans 2. Construction Stormwater Pollution Prevention 3. Source Control of Pollution 4. Preservation of Natural Drainage Systems and Outfalls 5. On-site Stormwater Management 6. Runoff Treatment 7. Flow Control 8. Wetlands Protection 9. Basin/Watershed Planning 10. Operation and Maintenance LOG ITEM Page 2 • The applicant's Stormwater Site Plan Submittal Template (attached) has been corrected to reflect full on-site dispersion rather than infiltration. The ten minimum stormwater management requirements are addressed within the Template. We have added discussions of Environmentally Sensitive Areas (ESAs) including wetlands and the DNR stream, and have added the approximate extent of wetlands to the site plan. • Approximate dimensions of native and non-native vegetation have been added to our site plan. • We have determined the minimum required width of native vegetation in the proposed full dispersion flow path to be 75 ft. As outlined in the SWMMWW Volume 5, page 5-37, the required flow path must be three times this width,or 225 ft. We have outlined a 75 ft wide by 225 ft long full dispersion flow path through mostly native vegetation on the site plan, and • Mr. Smith is prepared to grant a stormwater protection easement using the attached (uncompleted) STORMWATER MANAGEMENT FACILITY MAINTENANCE AGREEMENT. Section 2.0 of this agreement references our proposed 75'x225' Preserved Area is shown on the Site Plan with Existing Conditions and Proposed Stormwater Management Feature (April 10, 2017, by Streamline Environmental), attached. Once approved by your office,the applicant will mark the proposed Preserved Area in the field prior to construction activities. Please feel free to contact me directly if you have questions. Thank you for your assistance. Sincerely, AL Stre. -)ine ynvironmental, Inc. p40e."C S 64,4 Everett:Sorensen, P.E. •` ¢' ,1 ��'_ Principal Engineer (360) 821-9960 otp.t'•so everett@streamlineenv.com - s!9- 4//// (7 , A Attachments: Site Plan with Existing Conditions and Proposed Stormwater Management Features (Revised) CSPPP and TE&SC Notes (unchanged) Stormwater Calculation Worksheet(Revised) Stormwater Site Plan Submittal Template (Revised) STORMWATER MANAGEMENT FACILITY MAINTENANCE AGREEMENT Copies to: Mr. Austin Smith; via e-mail: smithad206@icloud.com Mr. Patrick Hopper,DCD;hard copy and via e-mail: PHopper@cojefferson.wa.us LOG ITEM Par:. 2 _O 2-