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ii. During maintenance (e.g., washing or re-patination), the following applies: • Minimize washing of architectural copper as it damages the patina and any protective coating. • Block storm drain inlets as needed to prevent runoff from entering storm drains. • Collect the wash or rinse water in a tank and dispose off-site or (with prior authorization from DSRSD), discharge the wash or rinse water to the sanitary sewer. j. Roof drains shall drain away from the building foundation. Flow shall drain to a bio-retention area for treatment prior to leaving the site as determined by the City Engineer/Chief Building Official. Construction Requirements The project shall comply with the "Construction General Permit" requirements of the NPDES Permit for construction activities (including other land disturbing activities) that disturb one acre or more (including smaller sites that are part of a larger common plan of development). Information related to the Construction General Permit is on line at: http://www.waterboards.ca.gov/water issues/programs/stormwater/construction.shtml http://www.waterboards.ca.gov/water issues/programs/stormwater/docs/finalconstpermi t.pdf The Construction General Permit's requirements include, but are not limited to, the following: a. The project developer shall obtain a construction general permit (NOI) from the Regional Water Quality Control Board to discharge stormwater, and to develop and implement stormwater pollution prevention plans. b. The project developer shall submit a Stormwater Pollution Prevention Plan (SWPPP) to the City Engineer/Chief Building Official for review and approval prior to the issuance of a grading or building permit, whichever is sooner. A copy of the approved SWPPP, including all approved amendments, shall be available at the project site for City's review until all engineering and building work is complete and City permits have been finaled. A site specific SWPPP must be combined with proper and timely installation of the BMPs, thorough and frequent inspections, maintenance, and documentations. SWPPP for the project shall be kept up to date with project's progress. Failure to comply with the most updated construction SWPPP may result in the issuance of correction notices, citations, and/or stop work orders. c. The project developer is responsible for implementing the following Best Management Practices (BMPs). These, as well as any other applicable measures, shall be included in the SWPPP and implemented as approved by the City. PUD-65-02-02D-06M, Lexus of Pleasanton Page 20 of 23