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• Within eight feet (8') of the tree trunk, no roots larger than two inches (2") in <br /> diameter shall be cut or ground unless prior approval has been received from <br /> the Director of Community Development. <br /> • Farther than eight feet (8') from the tree trunk, roots of any diameter may be <br /> ground a maximum of one-half (1/2) of their diameter if they are in conflict <br /> with the proposed work. Work of this nature shall only be performed using a <br /> mechanical stump grinder and only by personnel experienced with its <br /> operation. <br /> • Farther than eight feet (8') from the tree trunk, roots up to six inches (6") in <br /> diameter may be removed if they are in conflict with the proposed work. Roots <br /> that are removed shall be cleanly cut using a hand saw. <br /> Stormwater <br /> 127. The project shall comply with the City of Pleasanton's Stormwater NPDES Permit <br /> #CAS612008, dated October 14, 2009 and amendments (hereafter referred to as <br /> NPDES Permit). This NPDES Permit is issued by the California Regional Water Quality <br /> Control Board, San Francisco Bay Region (hereafter referred to as Regional Water <br /> Quality Control Board). Information related to the NPDES Permit is available at the City <br /> of Pleasanton Community Development Department, Engineering Division, and on line <br /> at: <br /> • http://www.ci.pleasanton.ca.us/business/planninq/StormWater.html <br /> • http://www.waterboards.ca.gov/sanfranciscobay/water issues/proqrams/stormwater/M <br /> unicipal/index.shtml <br /> A. Design Requirements <br /> 1. NPDES Permit design requirements include, but are not limited to, the following: <br /> a. Source control, site design, implementation, and maintenance standards when a <br /> regulated project (such as a commercial and industrial project) creates and/or <br /> replaces 10,000 square feet or more of impervious surface, including roof area, <br /> street, and sidewalk. <br /> b. Compliance with a Diazinon pollutant reduction plan (Pesticide Plan) to reduce or <br /> substitute pesticide use with less toxic alternatives. <br /> c. Compliance with a Copper Pollutant Reduction Plan and a Mercury Pollutant <br /> Reduction Plan. <br /> 2. The following requirements shall be incorporated into the project: <br /> a. The project developer shall submit a final grading and drainage plan, including <br /> stormwater treatment calculations, prepared by a licensed civil engineer <br /> depicting all final grades, onsite drainage control measures, and bio-retention <br /> swales. Irrigated bio-retention swales shall be designed to maximize stormwater <br /> entry at their most upstream point. The grading and drainage plans shall be <br /> subject to the review and approval of the City Engineer prior to the issuance of a <br /> grading or building permit, whichever is sooner. <br /> b. The project developer shall submit to the City Engineer the sizing design criteria <br /> and calculations for the treatment of stormwater runoff. The design criteria and <br /> calculations shall be subject to the review and approval of the City Engineer and <br /> 23 <br />