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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 / programs /stormwater /construction.s <br />html <br />http : / /www.waterboards.ca.gov/water issues / proqrams /stormwater /docslfinalcon <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 />