1300 W MARINE VIEW DR WATERFRONT PLACE APARTMENTS 2022-07-28

4.1) PUBLIC WORKS 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. i. Sheet C2.01 ii. Sheet C2.02 iii. Sheet C2.100 iv. Sheet C4.01 v. 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 Erik Emerson with the City of Everett Surface Water Division(425-257-8995 or EEmerson@everettwa.gov). a. The drainage system for the North Building parking lot is shown with the majority of the parking lot draining to a connection to the stormwater system in 13th St However, the original Port of Everett stormwater design identified this area draining to either 14th St. or Seiner Drive. The storm drainage pipe system in 13th St. does not connect to the treatment facility constructed by the Port for this site. The parking lot conveyance system should be redesigned to connect to the 14th Street system as intended in the approved Port design. Update any plan and profile sheets as necessary. b. The conveyance calculations included in Appendix E appear to be based on the King County methodology for the Rational Method. The analysis should be performed using the methodology outlined in Section 4-3.1 of the City's Design and Construction Development Standards and Specifications (DCSS),which includes intensity coefficients specific to the Everett area. c. The backwater calculations included in Appendix E are based on the 25 year water surface elevations calculated by the Port of Everett for their street drainage system pipe sizing. The analysis should also be run using the water surface elevations from the Port's 100 year backwater analysis and the 100 year flows from the site. In the 100 year analysis a limited amount of surface flooding is acceptable as defined in Section 4-2.2(3) of the DCSS manual. Due to the methodology used in the Port's design the 100 year hydraulic grade line is likely to be more representative of the actual conditions in large storm events. d. Turn in a copy of the C-SWPPP that you have turned in to Ecology for the Construction General Stormwater Permit. The Cement Deep Soil Mixing report should be referenced in the C-SWPPP. 3. The Planning Department is conducting a separate review of the landscape plans. You will receive a separate correction letter, if required, from this project's Planner, John Jimerson. If you have any questions regarding these comments, please contact John Jimerson with the City of Everett Planning Department(425-257-8737 or JJimerson@everettwa.gov). Page 2 of 2