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• Farther than eight feet (8') from the tree trunk, roots of any diameter <br /> may be ground a maximum of one-half (1/2) of their diameter if they are <br /> in conflict with the proposed work. Work of this nature shall only be <br /> performed using a mechanical stump grinder and only by personnel <br /> experienced with its operation. <br /> • Farther than eight feet (8') from the tree trunk, roots up to six inches <br /> (6") in diameter may be removed if they are in conflict with the <br /> proposed work. Roots that are removed shall be cleanly cut using a <br /> 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 <br /> Quality Control Board, San Francisco Bay Region (hereafter referred to as <br /> Regional Water Quality Control Board). Information related to the NPDES Permit <br /> is available at the City of Pleasanton Community Development Department, <br /> Engineering Division, and on line at: <br /> • http://www.ci.pleasanton.ca.us/business/planning/StormWater.html <br /> • http://www.waterboards.ca.gov/sanfranciscobay/water issues/programs/storm <br /> water/M u n ici pa I/i nd ex.shtm I <br /> A. Design Requirements <br /> 1. NPDES Permit design requirements include, but are not limited to, the <br /> following: <br /> a. Source control, site design, implementation, and maintenance standards <br /> when a regulated project (such as a commercial and industrial project) <br /> creates and/or replaces 10,000 square feet or more of impervious surface, <br /> including roof area, street, and sidewalk. <br /> b. Compliance with a Diazinon pollutant reduction plan (Pesticide Plan) to <br /> reduce or substitute pesticide use with less toxic alternatives. <br /> c. Compliance with a Copper Pollutant Reduction Plan and a Mercury <br /> Pollutant 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, <br /> including stormwater treatment calculations, prepared by a licensed civil <br /> engineer depicting all final grades, onsite drainage control measures, and <br /> bio-retention swales. Irrigated bio-retention swales shall be designed to <br /> maximize stormwater entry at their most upstream point. The grading and <br /> 26 <br />