2235 LAKE HEIGHTS DR 2020-12-23 - Laserfiche WebLink

• R tyro PUBLIC WORKS .91-401- 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. i. Sheet C 1.01 ii. Sheet C1.02 iii. Sheet C4.01 iv. Sheet C4.02 2. The comments below were generated from this project's Stormwater Reviewer. If you have any questions regarding these comments, please contact Jane Zimmerman with the City of Everett Surface Water Department (425-257-8885 or JaneZ@everettwa.gov). a. Stormwater Site Plan comments: In Section 2.0 of the SSP, in the 4th paragraph, the first sentence reads "[t]here are known historical flooding problems on the site." It appears this sentence is missing a"no" in front of"known"...? If not, more explanation is needed. MR#2-Construction Stormwater Pollution Prevention: Coverage under Ecology's Construction Stormwater General Permit (CSWGP) is required because the project will disturb an acre or more of land. Additional information can be found at the following link: https://ecolo gy.wa.gov/Regulations-Permit s/Permits-certifications/Stormwater- general-permits/Construction-stormwater-permit MR#3 —Source Control: The section of the Stormwater Site Plan covering MR#3 needs to be expanded. Operational and structural BMPs must be selected per Chapter 2 of Volume IV of the SWMM, detailed in the drainage report, and shown on the plans as appropriate. All BMPs noted as "applicable", including operational, good housekeeping and preventative maintenance BMPs presented in Chapter 2, are required in the City of Everett per the City's NPDES Municipal Stormwater Permit. However, "recommended additional"BMPs are not required. Of particular importance on this site, considering the project's proximity to Silver Lake, are BMPs for Landscaping and Lawn/Vegetation Management (S411). MR#5—Onsite Stormwater Management: The Stormwater Site Plan for the project must clearly identify why each listed on-site stormwater management BMP (MR#5) is infeasible using the infeasibility criteria contained in the 2014 SWMMWW for each individual BMP. The presence of Alderwood Till soils (or other low permeability soils) is not, of itself, an infeasibility criteria because an infiltration rate of more than 0.3 inches per hour is considered a feasible infiltration rate for on-site stoiiiiwater management BMPs. The presence of perched groundwater may preclude the use of any of the infiltrating-type on-site stormwater management BMPs,but must be specifically checked and identified for each BMP against the specific BMP's infeasibility criteria. Page 2 of 5