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of a grading or building permit, whichever is sooner. The structural control shall be cleaned at least twice a year (once immediately prior to October 15 and once in January). c. The project developer shall submit to the City Engineer the sizing design criteria and calculations for a hydromodification facility, if required, and for the treatment of stormwater runoff. The design criteria and calculations shall be subject to the review and approval of the City Engineer and shall be submitted prior to the issuance of a grading or building permit, whichever is sooner. d. Building/Structures shall be designed to minimize the occurrence and entry of pests into buildings, thus minimizing the need for pesticides, as determined by the Chief Building Official prior to the issuance of a building permit. e. The project's landscape and irrigation plans shall be designed to: 1) minimize the use of fertilizers and pesticides that can contribute to stormwater pollution; and 2) promote surface infiltration. Prior to the installation of project landscaping and irrigation, the project landscape architect shall submit a landscaping and irrigation plan to the City Engineer for review and approval and submit written verification stating the project incorporates the following: i. Plants tolerant of saturated soil conditions and prolonged exposure to water in areas that provide detention of water. ii. Plants and soil amendments appropriate to site specific characteristics such as topography and climate. iii. Landscaping and irrigation consistent with Bay-Friendly Landscaping. iv. Water conservation techniques to promote surface infiltration. f. All metal roofs, gutters, and downspouts shall be finished with rust-inhibitive finish/paint as determined by the Chief Building Official. g. All projects using architectural copper roofing, gutters, downspouts, etc., shall utilize the following Best Management Practices for use and maintenance: i. During installation, copper material shall be pre-patinated at the factory. If patination is done on-site; collect the rinse water in a tank and haul off-site for disposal. With prior authorization from Dublin San Ramon Services District (DSRSD), you may collect the rinse water in a tank and discharge to the sanitary sewer. Optionally, consider coating the copper materials with a clear coating that prevents further corrosion and stormwater pollution. The clear coating, if utilized, shall be reapplied (as recommended by the coating manufacturer) to maintain its efficacy. 13-Uniti Development Plan Ponderosa Homes PUD-97, Conditions of Approval 28 of 32 4202 Stanley Boulevard