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debris on-site and grading activities would increase the potential for erosion and sedimentation that <br /> could be carried by runoff into the San Francisco Bay. As a result, construction activities would <br /> result in a temporary increase in pollutants in stormwater runoff. <br /> Impact HYD-l: Construction activities could temporarily increase pollutant loads in <br /> stormwater runof£ (Significant Impact) <br /> Mitigation and Avoidance Measures <br /> The following mitigation measures,based on RWQCB Best Management Practices, are included in <br /> the project to ensure compliance with NPDES permit requirements to reduce construction-related <br /> water quality impacts: <br /> MM HYD 1-l: During construction,burlap bags filled with drain rock will be installed around <br /> storm drains to route sediment and other debris away from the drains. <br /> MM HYD 1-2: During construction, earthmoving or other dust-producing activities will be <br /> suspended during periods of high winds. <br /> MM HYD 1-3: During construction, all exposed or disturbed soil surfaces will be watered at least <br /> twice daily to control dust as necessary. <br /> MM HYD 1-4: During construction, stockpiles of soil or other materials that can be blown by the <br /> wind will be watered or covered. <br /> MM HYD 1-5: During construction, all trucks hauling soil, sand, and other loose materials will <br /> be covered and/or all trucks will be required to maintain at least two feet of <br /> freeboard. <br /> MM HYD 1-6: During construction, all paved access roads,parking areas, staging areas and <br /> residential streets adjacent to the construction sites will be swept daily (with <br /> water sweepers). <br /> MM HYD 1-7: During construction,vegetation in disturbed areas will be replanted as quickly as <br /> possible. <br /> MM HYD 1-8: Prior to construction grading for the proposed land uses,the applicant will file a <br /> "Notice of Intent" (NOI)to comply with the General Permit administered by the <br /> Regional Board and will prepare a Stormwater Pollution Prevention Plan <br /> (SWPPP)which addresses measures that would be included in the amendment to <br /> minimize and control construction and post-construction runof£ The following <br /> measures would be included in the SWPPP: <br /> — Preclude non-stormwater discharges to the stormwater system. <br /> — Effective, site-specific Best Management Practices for erosion and <br /> sediment control during the construction and post-construction <br /> periods. <br /> Kensington Assisted Living Facility Project 56 Initial Study <br /> Redwood City Apri12013 <br />