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# N <br />1 =9 PC2 <br />TOT <br />DAVID EVANS <br />ANDASSOCIATES INC. <br />September 21, 2020 <br />Sabrina Fandler (for Benyam Stephanos) ff-M-,J <br />Development Technician <br />City of Everett Permit Services <br />3200 Cedar Street, 2nd Floor <br />Everett, WA 98201 <br />RE: Airport 100 (2202 100th Street SW ) <br />Public Works Storm Drainage Review FP <br />2004-012 <br />DEA Job No. KEST-0001 <br />Dear Sabrina, <br />0 <br />We understand that you have taken over review of this project for Benyam Stephanos who has retired. <br />I am writing on behalf of the Applicant (Kelly Stephens, Airport 100 LLC, 206 660 8383) to make this <br />resubmittal in response to: <br />• Cindy Cullen's review comments emailed to Benyam dated June 18, 2020. <br />• Michael Brick's review comment emailed to Benyam dated June 22, 2020. <br />Our enclosures are listed as follows: <br />1. Civil Plans revision dated 9/21/20 <br />2. Storm Drainage Report revision dated 8/12/20 <br />3. Completed Declaration of Covenant and Grant Easement for Inspection and Maintenance of <br />Stormwater Facilities and BMPs <br />Our response to each of Cindy Cullen's review comments is shown in bold italics as follows: <br />1. Per the City of Everett DCSS, flow control is required for 5,000 SF of new and replaced hard surface, <br />whereas the 2019 Manual specifies 10,000 SF. (This is only a correction to language in your report.) <br />Revised as requested, see page 2-4 of the enclosed Storm Drainage Report. <br />2. Provide additional information on Source Control BMPs to meet Minimum Requirement #3 as there <br />is more emphasis on Source Control in the 2019 Manual. The Source Control BMPs should be <br />discussed separately from Construction BMPs. <br />Revised as requested, see page 2-1 of the enclosed Storm Drainage Report for the start of the <br />Source Control BMPs discussion. <br />3. The Manual requires that the site conditions and infeasibility criteria be documented to deem a <br />BMP infeasible. Include language on why BMP T5.10C: Perforated Stub -out Connections was not <br />used. <br />BMP T5.10C was determined to be infeasible because the seasonal water table would be less than <br />one foot below the trench bottom. Also, from a maintenance standpoint, this BMP should not be <br />located under impervious or heavily compacted surfaces. Due to the short distance from the roof <br />drain connection to Vault Inlet 2A, this BMP would have to be located under the pavement of <br />Drive 'A'. <br />20300 Woodinville Snohomish Road NE Suite A Woodinville Washington 98072 Telephone: 425.415.2000 Facsimile: 425.486.5059 <br />