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hydraulic calculations shall also be reviewed and approved by the City and Alameda County Public Works Agency. 2. The Sub -divider shall make necessary payments to Alameda County Public Works Agency for their review of the drainage their facilities. 3. The subdivision shall be graded to allow for the overland release of run-off into Davis Street during a higher than design storm event and/or in the event of total failure of the on -site storm drainage system. 4. The Developer is proposing to drain storm water run-off from the southern portion of the site to forty-two (42) inch Alameda County Storm Drain line. Historical evidence indicates deficiencies in the storm drain system, which are problematic during high tides and rare stones. Therefore, the Developer's engineer shall calculate the capacity of the downstream facility, so that City Engineer may ascertain its ability to accept additional flow. The hydrologic and hydraulic analysis shall include all the properties upstream, which drains into this 42-inch storm line. Because the storm drain facility is owned by Alameda County Public Works Agency, the Developer shall also provide evidence of the Agency's acceptance of the additional flow. A minimum freeboard of twelve (12) inches from the hydraulic Grade Line to the gutter flow lines must be maintained at all times during the design storm. D. GRADING EROSION AND POST -CONSTRUCTION CONTROLS 1. Prior to any grading operations, Developer shall submit all information including a Grading Plan accompanied by Soils Engineering and Engineering Geology Reports, in accordance with requirements of the City of San Leandro Municipal Code Title VII, Chapter 12 and obtain a grading permit. 2. To control storm water pollution, the Developer shall comply with the regulations and provisions contained in the City's Grading Ordinance, the City's Storm Water Pollution Prevention Permit, and the National Pollutant Discharge Elimination System (NPDES) to the satisfaction of the City Engineer. 3. Until such time as all construction for the development has been completed to the satisfaction of the City Engineer, the Sub -divider shall provide current Erosion & Sediment Control Plans and amended Storm Water Pollution Prevention Plans (SWPPP's) for all portions of the site where construction is on -going. Said Plans shall be submitted to the City Engineer for review and approval on or before September 1, of each calendar year, and shall be fully implemented on or before October 15, of each calendar year. 4. During construction the following high standards for sanitation are required: Garbage cans, construction dumpsters, and debris piles shall be removed on a Revised Recommended Conditions of Approval PLN2002-00031 Bayside Business Park November 4, 2002 Page 19