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8.A. - Page 25 <br /> substantially alter the e�sting drainage pattern of the site in a manner that could <br /> result in substantial erosion or siltation on or off site. <br /> Mitigation: MM HYD—6: The project shall install a stormwater treatment system so that runoff <br /> would be filtered over a minimum of twenty-five (25) feet of vegetation or through <br /> other equivalent means and will not degrade water quality before discharging into the <br /> City storm drain system and eventually Cordilleras Creek. Prior to recordation of the <br /> final map,the applicant shall enter into an Operation and Maintenance Agreement, <br /> and provide a maintenance plan, with the City to ensure the ongoing operation and <br /> maintenance of treatment controls for the on-site drainage system. <br /> Finding: Implementation of MM HYD—6 would reduce the project's impact on water quality <br /> post-construction to a less than significant level. <br /> Facts in Support of Finding: Implementation of MM HYD—6 would reduce the project's impact <br /> on water quality post-construction by complying with the NPDES permit that <br /> requires treatment measures to be incorporated into the project to reduce <br /> contaminants in surface runoff as described in Section 22 —Hydrology and Water <br /> Quality of the Draft EIR on pages 50-63,which is hereby incorporated by reference. <br /> Noise <br /> Impact: Impact NOI— L• Noise generating activities associated with demolition and <br /> construction at the project site would temporarily elevate noise levels in the area <br /> surrounding the project site. <br /> Mitigation: MM NOI— 1: The project shall implement the following measures to reduce the <br /> duration and volume of construction noise: <br /> a. Limit construction to daytime hours (7:00 AM to 8:00 PM) Monday through <br /> Friday,with no construction activities on weekends or holidays per Section <br /> 2432 of the City of Redwood City Municipal Code. <br /> b. Construction activities or equipment shall not generate noise levels exceeding <br /> 110 dB(A)per Sec. 2431 of the City of Redwood City Municipal Code. <br /> c. Utilize "quiet" models of air compressors and other stationary noise sources <br /> where technology exists. <br /> d. Prohibit unnecessary idling of internal combustion engine. <br /> 14 <br /> Page 19 of 42 <br />