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

41"r • • PUBLIC WORKS • Add a narrative for Element 13: Low Impact Development, and include your BMP selection (options to satisfy this element include the following BMP#'s: C102, C103, C200, C207, C208, C231, C233, C234). iii. 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 stottuwater 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. • 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. iv. 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. v. MR#7: Flow Control • It appears that MR#7 will be triggered when new plus replaced surfaces are considered. vi. MR#9: Operation and Maintenance • 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. o 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. o 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. Page 3 of 5