10524 13TH AVE W 2024-12-02 - Laserfiche WebLink

• • 4. a. MR#5: On-Site Stormwater Management Project soils that are unsuitable for infiltration for the purposes of meeting flow control requirements (MR#7) may be feasible for on-site stormwater management BMPs to meet MR#5. The geotechnical information provided to this point does not adequately address the infeasibility criteria for on-site stormwater management BMPs—for these BMPs to be deemed infeasible,one or more of the specific infeasibility criteria must be cited for each BMP in List#2. Additional information has been provided in the drainage report to address how the LID BMPS were selected and deemed infeasible. b. For each type of surface in List#2(lawn&landscaped,roofs,and other hard surfaces),the BMPs must be evaluated in the order given in the list for the feasibility of each on-site stormwater management BMP. The feasibility criteria to be used are those given for each type of BMP in the appropriate section of the Stormwater Management Manual. The drainage report has been updated to provide an evaluation of each applicable LID BMP option. 5. MR#6: Runoff Treatment Per existing code,the site's new and replaced surfaces must be considered to determine if the 5,000 square foot threshold is met for runoff treatment—the 3,604-sf number doesn't appear to change, but"plus replaced"needs to be added to this section so it's clear that replaced surfaces are also being considered. 3,604 corrected to 2,985. 6. MR#7: Flow Control It appears that MR#7 will be triggered when new plus replaced surfaces are considered. MR#7 added to drainage report. 7. MR#9: Operation and Maintenance a. If MRs#6 or#7 must be met for this project, then maintenance and operation information for the stormwater facilities must be provided in a separate document entitled"Maintenance and Operations Manual". This document must include a first page indicating the party responsible for maintenance and operation. In addition,the following language shall also be included in both the M&O manual and the drainage report. A O&M SECTION HAS BEEN ADDED TO THE REPORT. b. A copy of the maintenance and operations manual shall be retained on-site or within reasonable access to the site and shall be transferred with the property to any new owner. A log of maintenance activities that indicate what actions were taken Shall be kept and be available for inspection by the City of Everett upon request. Noted. c. In addition to the maintenance checklists provided in the Stormwater Management Manual,the three checklists found at the end of Section 4 of the DCSS must also be included as applicable, Noted/provided. CIVIL PLANS 1. The outlet,pipe from the wetland to the west of this project crosses the northeast corner of proposed lot 1. A minimum of 5' from the edge of this pipe shall be dedicated in a private drainage easement granted to the adjacent property owner at 10518 13th Ave W,where the pipe originates. Privat drainage easement to benefit TPN:00552500003200 added. 2. The existing pipe information for the 18"storm drain along the frontage of this project indicates the pipe is corrugated metal on all the plan views. However,the detail of CB#2 on the profile view indicates the pipe is CPEP. All references to the pipe must be consistent. Revised. 5005 200th Street Southwest, Suite 101-B i Lynnwood, WA 98036 www.pugetsoundplanning.com I info@pugetsoundplanning.com 1 (425) 830-1046