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g. All projects using architectural copper roofing, gutters, downspouts, etc., <br />shall utilize the following Best Management Practices for use and <br />maintenance: <br />i. 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 />ii. During maintenance, the following applies during washing and <br />patination: <br />1. Minimize washing of architectural copper as it damages the <br />patina and any protective coating. <br />2. Block all storm drain inlets downstream of the wash. <br />3. Collect in a tank and dispose off -site, or discharge the wash water <br />to the sanitary sewer (with prior authorization from DSRSD). <br />h. During re- patination, collect the rinse water in a tank and dispose off -site or <br />discharge to sewer (with prior authorization from DSRSD). <br />i. Roof drains shall drain away from the building foundation. Stormwater flow <br />shall drain to a landscaped area or to an unpaved area wherever practicable <br />as determined by the City Engineer /Chief Building Official. <br />Construction Requirements <br />140. 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 />O http: / /www.waterboards.ca.gov /water issues /programs /stormwater /constr <br />uction.html <br />• http: / /www.waterboards.ca.gov /water issues /programs /stormwater /docs /fi <br />nalconstpermit.pdf <br />P16 -1201, P16 -1202 & PUD -120, Catalyst Development City Council <br />Page 26 of 30 <br />