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A minimum of 10 feet of perforated pipe is required per 5,000 square feet of roof area: <br /> • Perforated pipe required: 15.6 feet <br /> • Perforated pipe provided: 32 feet <br /> Other Hard Surfaces: Dispersion (full or sheet flow) is not feasible as the site is fully <br /> developed in the existing condition. Infiltration facilities such as pervious pavement will <br /> not be feasible due to the potential environmental impacts of installing LIDs in such close <br /> proximity to a prospective contaminant source. <br /> E. FLOW CONTROL SYSTEM <br /> The project does not propose changes to the exiting site flow control system. <br /> F. WATER QUALITY SYSTEM <br /> Water quality requirements will not be changed from the existing water quality detention <br /> vault, water quality detention pond, stormfilter vault, and biofiltration swale. Oil control <br /> will be maintained using an oil/water'separator. Source controls such as a covered and <br /> hydraulically isolated fueling pad will be re-established for the expanded fueling station. <br /> The oil/water separator will continue to discharge to the sewer, as it does in the current <br /> condition, and has been sized in accordance with the 2015 Uniform Plumbing Code <br /> Section 1017.1. <br /> G. CONVEYANCE SYSTEM ANALYSIS AND DESIGN <br /> The project proposes modifications to the existing conveyance system limited to rerouting <br /> the existing system outside of the proposed expansion. The conveyance system has <br /> been designed with sufficient capacity to convey the 100-year peak flow. Figure 10: <br /> Basin Map and conveyance calculations have been included in this section. <br /> 6226.0xx <br />