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River Islands Development at Lathrop November 2020 <br /> Final Phase 2 Sewer Technical Report Rev 1 #6520 <br /> 7.1.4.1 Sewer Lift Station LS-A1 Preliminary Capacity Analysis <br /> As shown in Figure 2-1, LS-A1 has the potential to see flows from multiple different collection areas under <br /> interim, normal,and emergency situations in the future. The station is currently only installed with two 1,100 <br /> GPM pumps with provisions for two additional 1,100 GPM pumps in the future. The two pumps currently <br /> provide a firm pumping capacity of 1,100 GPM in accordance with the City Standards. Table 7-3 below <br /> describes the potential interim, normal, and emergency operating scenarios and the corresponding <br /> pumping capacity requirements for LS-A1. This preliminary capacity analysis is required to be revisited <br /> once final improvement plans and land use summaries are provided for Phase Il. <br /> Table 7-3: Sewer Lift Station LS-A1 Preliminary Capacity Analysis <br /> ADWF <br /> From Area <br /> Other Al PWWF1 <br /> Areas ADWF (GPD) Minimum Firm Pumping Capacity <br /> Scenario (GPD) (GPD) GPM Requirements <br /> From Collection Area Al Only 0 603,302 1,3989 99 1 duty + 1 standby 1,100 GPM pumps required <br /> From Collection Area A1+131 650,870 603,302 2,587,174 2 duty + 1 standby 1,100 GPM pumps required <br /> 1,797 <br /> From Collection Area A1+C2 301,327 603,302 1,900,747 2 duty+ 1 standby 1,100 GPM pumps required <br /> 1,320 <br /> From Collection Area Al+B1+C2 952,197 603,302 3,194,853 3 duty + 1 standby 1,100 GPM pumps required <br /> 2,219 <br /> From Collection Area Al+B1+C2+C1 1,160,278 603,302 3,618,370 3 duty+ 1 standby 1,100 GPM pumps required <br /> 2,513 <br /> Notes: <br /> 1. PWWF shown is based on the ADWF from mentioned areas and conveyed to LS-A1. <br /> 31 <br />