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h. All metal roofs, gutters, and downspouts shall be finished with rust-inhibitive <br /> finish/paint as determined by the Chief Building Official. <br /> i. All projects using architectural copper roofing, gutters, downspouts, etc., <br /> shall utilize the following Best Management Practices for the use and <br /> maintenance: <br /> a. During installation, copper material shall be pre-patinated at the factory, <br /> if available. 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 San <br /> Ramon Services District (DSRSD), the rinse water may be collected in a <br /> tank and discharged to the sanitary sewer. Consider coating the copper <br /> materials with a clear coating that prevents further corrosion and <br /> stormwater pollution. The clear coating, if utilized, shall be reapplied (as <br /> recommended by the coating manufacturer) to maintain its efficacy. <br /> b. During maintenance (e.g., washing or re-patination), the following <br /> applies: <br /> i. Minimize washing of architectural copper as it damages the patina <br /> and any protective coating. <br /> ii. Block storm drain inlets as needed to prevent runoff from entering <br /> storm drains. <br /> iii. Collect the wash or rinse water in a tank and dispose off-site or <br /> (with prior authorization from DSRSD), discharge the wash or <br /> rinse water to the sanitary sewer. <br /> j. Roof drains shall drain away from the building foundation. Ten percent of the <br /> stormwater flow shall drain to a landscaped area or to an unpaved area <br /> wherever practicable as determined by the City Engineer/Chief Building <br /> Official. <br /> B. Construction Requirements <br /> The project shall comply with the "Construction General Permit" requirements of <br /> the NPDES Permit for construction activities (including other land disturbing <br /> activities) that disturb one acre or more (including smaller sites that are part of a <br /> larger common plan of development). <br /> Information related to the Construction General Permit is on line at: <br /> http://www.waterboards.ca.qov/water issues/proqrams/stormwater/construction.s <br /> html <br /> http://www.waterboards.ca.gov/water issues/proqrams/stormwater/docs/nalcon <br /> stpermit.pdf <br /> 1. The Construction General Permit's requirements include, but are not <br /> limited to, the following: <br /> 24 of 28 <br />