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Preliminary Design Report Addendum No.2 <br />the existing hvine Station has available capacity during the off peak hours from midnight to 5:00 am. As <br />such, the available pumping capacity that is available to service the Santa Ana Delhi Channel Diversion is <br />approximately 90,000 gallons. Below is a generalized flow balance summary based on providing <br />irrigation water to the Newport Golf Club during the winter months: <br />Urban Discharge from SAD Channel .................. 260,000 gallons <br />Golf Course Irrigation Demand (winter) ............. <200,000> gallons <br />Irvine Station Pump Capacity Volume ................ <90,000> gallons <br />Excess Capacity .................... ............................... <30,000> gallons <br />Dry- weather Flow Diversion Alternative 2 - Alternative 2 is based on developing a direct connection to <br />the OCSD trunk main as discussed above and not providing any irrigation supplies to the Newport Beach <br />Golf Club. This alternative would consist of developing the overall diversion and treatment facilities as <br />discussed above and constructing a new force main trunk from the treatment facilities to the OCSD trunk <br />main. Advantages associated with Alternative 1 include no dependence on Costa Mesa Sanitation District <br />facilities, specifically the Irvine Station, and the limited pumping scenario from midnight to 5:00 am. It <br />also provides for the opportunity to use continuous pumping throughout the day. The only disadvantage is <br />that this scenario will require the construction of approximately 2 miles of 8 inch diameter force main <br />from the diversion facilities to the OCSD trunk connection. Below is a generalized flow balance summary <br />based on direct pumping to the OCSD trunk main: <br />Urban Discharge from SAD Channel .................. 260,000 gallons <br />Pumping Rate to OCSD Trunk (300 gpm) .......... <270,000> gallons at 15 hrs /day <br />Excess Capacity .................... ............................... <10,000> gallons <br />More details on the above two alternatives can be found in Section 3. <br />Table 2- 1 Dry- weather Flows and Diversion Alternatives Summary <br />Flow <br />Design Flow ( m) <br />Design Flow d) <br />Dry- weather Flow <br />180 <br />260,000 <br />Alternative 1 <br />Pump Station to CMSD (5hrs) <br />300 <br />90,000 <br />Pump Station to Golf Course 19 hrs) <br />300 <br />342,000 <br />Golf Course Irrigation Demand <br />200,000 (winter) <br />292,000 (summer) <br />Alternative 2 <br />Pump Station to OCSD (24 hrs) <br />300 <br />432,000 <br />URS 4 <br />25F -136 <br />