AgdaPkt 2015-09-28 Joint SA PFA - Laserfiche WebLink

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Page 11 of 21 ATTY/RESO.3139/ CC RESO 601 MARSHALL DENYING APPEALS AND APPROVING TENTATIVE MAP, DOWNTOWN PLANNED COMMUNITY PERMIT, AND PARKING IN LIEU FEE APPLICATION REV: 9/24/15 PT 26. Redwood City has exceeded its Peak Wet Weather Flow (PWWF) capacity in the past. A methodology to reduce inflow and infiltration by pipe replacement was determined. The applicant shall reduce inflow and infiltration to offset increased sewer demand from the project by replacing aged sewer mains or pay an equivalent in-lieu fee. The length of pipe replacement required or the amount of fee will be based on the project’s sewage generation projection (Attachment L of the City’s Engineering Standards). 27. Grading shall be performed in accordance with Volume III, Part II of the City’s Engineering Standards (http://www.redwoodcity.org/home/showdocument?id=2428). Soil or other construction materials shall not be stockpiled in the public right-of-way. Applicant shall submit cut/fill volumes (CY) for all soils to be imported to or exported from the site. 28. Post-construction runoff into the storm drain shall not exceed pre-construction runoff levels. The applicant’s design professional shall evaluate the project’s impact to the City’s storm drainage system and shall substantiate their conclusions with drainage calculations to the satisfaction of the City Engineer. The project shall be designed in conformance with the Drainage Guidelines for Commercial Development, including detaining the difference between the 10-year preconstruction storm event and the 30- year post-construction storm event, and the detention of the 100-year storm event if possible. The commercial drainage guidelines can be found on the City’s website at: http://www.redwoodcity.org/bit/infrastructure/pdf/Drainage_Guidelines_Commercial_2005-02- 01.pdf 29. Plans shall be designed to meet the C3 requirements of the Municipal Regional Permit (MRP) NPDES Permit CAS 612008. 30. If construction is not complete by the start of the wet season (October 1 through April 30), the applicant shall implement a winterization program to minimize the potential for erosion and sedimentation. As appropriate to the site and status of construction, winterization requirements shall include inspecting/maintaining/cleaning all soil erosion and sedimentation controls prior to, during, and immediately after each storm event; stabilizing disturbed soils through temporary or permanent seeding, mulching, matting, tarping or other physical means; rocking unpaved vehicle access to limit dispersion of much onto public right-of-way; and covering/tarping stored construction materials, fuels, and other chemicals. Plans to include proposed measures to prevent erosion and polluted runoff from all site conditions shall be submitted for approval by CDD prior to beginning construction. As site conditions warrant, the City Engineer may direct the applicant to implement additional winterization requirements. 31. Stormwater treatment measures to be shown on final improvement or grading plans shall not differ materially from the LID treatment measures presented on the project’s Tentative Map, approved on June 30, 2015, without written approval from the Engineering Department. 7.A. - Page 43