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i. All projects using architectural copper roofing, gutters, downspouts, etc., <br /> shall utilize the following Best Management Practices for use and <br /> maintenance: <br /> a. During installation, copper material shall be pre-patinated at the <br /> factory. If patination is done on-site; collect the rinse water in a tank <br /> and haul off-site for disposal. With prior authorization from Dublin <br /> San Ramon Services District (DSRSD), you may collect the rinse <br /> water in a tank and discharge to the sanitary sewer. Optionally, <br /> consider coating the copper materials with a clear coating that <br /> prevents further corrosion and stormwater pollution. The clear <br /> coating, if utilized, shall be reapplied (as recommended by the <br /> coating manufacturer) to maintain its efficacy. <br /> b. During maintenance, the following applies during washing and <br /> patination: <br /> i. Minimize washing of architectural copper as it damages the <br /> patina and any protective coating. <br /> ii. Block all storm drain inlets downstream of the wash. <br /> iii. collect in a tank and dispose off-site, or discharge the wash <br /> water to the sanitary sewer (with prior authorization from <br /> DSRSD). <br /> c. During re-patination, collect the rinse water in a tank and dispose off- <br /> site or discharge to sewer (with prior authorization from DSRSD) . <br /> j. Roof drains shall drain away from the building foundation. Stormwater <br /> flow shall drain to a landscaped area or to an unpaved area wherever <br /> practicable as determined by the City Engineer/Chief Building Official. <br /> k. There shall be no direct roof leaders connected to the street gutter/parking <br /> lot or storm drain system, unless otherwise approved by the City engineer. <br /> B. Construction Requirements <br /> The project shall comply with the "Construction General Permit" requirements <br /> of the NPDES Permit for construction activities (including other land <br /> disturbing activities) that disturb one acre or more (including smaller sites that <br /> are part of a larger common plan of development). <br /> Information related to the Construction General Permit is on line at: <br /> • http://www.waterboards.ca.gov/water issues/proqrams/stormwater/construction <br /> .shtml <br /> • http://www.waterboards.ca.gov/water issues/programs/stormwater/docs/finalco <br /> nstpermit.pdf <br /> 1. The Construction General Permit's requirements include, but are not limited <br /> to, the following: <br /> a. The project developer shall obtain a construction general permit (NOI) <br /> from the Regional Water Quality Control Board to discharge stormwater, <br /> and to develop and implement stormwater pollution prevention plans. <br /> 28 <br />