10200 19TH AVE SE COSTCO FUEL STATION 2022-05-23

e. , Y_ PUBLIC WORKS '3i-tolVimmA A b. Please see all redlines on the attached plans for required corrections in addition to all comments listed below. Frequently, redlines will be stand-alone and will not have an associated item in this corrections letter.Likewise,comments below may not have associated redlines. Please indicate to the City that all redlines have been adequately addressed by providing checkmarks or notes next to the City's redlines to indicate that it has been picked up or to answer a reviewer's question. A comment response letter can also be included with your resubmittal to address the comments below(handwritten remarks under each comment on this letter are perfectly acceptable). The below listed sheets have redlines. Vr i. Sheet C1.0 ��i. Sheet C2.0 �s/�iii. Sheet C3.0 V i�'. Sheet C4.0 V`'. Sheet C5.0 2. The comments below were generated from this project's Stormwater Reviewer. If you have any questions regarding these comments,please contact Erik Emerson with the City of Everett Surface Water Division(425-257-8995 or EEmerson@everettwa.gov). i. A soils report from 2015 is provided in Section 7 of the SSP, but this soils report does not provide the required information regarding infiltration feasibility assessment. If poor infiltration is used as justification for LID BMP infeasibility, an appropriate infiltration study will be required. ii. The SSP provides limited documentation, but does not provide all the required documentation as listed in the Stormwater Management Manual. As an example, Section 5.0.A of the SSP provides a brief sentence on existing site hydrology, but does not provide required documentation regarding delineation and acreage of areas contributing runoff to the site,flow control facility location,outfall,overflow route, and natural streams and drainage features. See Volume I, Section 3.1.5 of the Manual for detailed requirements for each of the following elements: • Totals of new hard surfaces,replaced hard surfaces,and converted pervious surfaces • Discussion of infiltration feasibility based on documentation provided in the soils report(see above comment for Step 1) • Maintenance instructions for On-site Stormwater Management BMPs need to be provided. • Update the vicinity map to show the route of stormwater off-site to the local natural receiving water, significant geographic features and sensitive/critical areas (streams, wetlands, lakes, steep slopes, etc.). If no geographic features or sensitive/critical areas exist on-site or along the identified route to the receiving water, that should be stated in the SSP. (!age 2 of3 ,--<< �.�....,.....�...gip