Laserfiche WebLink
River Islands Development at Lathrop November 2020 <br /> Final Phase 2 Sewer Technical Report Rev 1 #6520 <br /> 6.2.2 Sewer Lift Station C1 (LS-C1)— Preliminary Firm Pumping Capacity Requirements <br /> The City's Standards require that sewer lift stations be designed to provide a firm pumping capacity equal <br /> to the PWWFs from the corresponding collection area. Firm pumping capacity is defined as the total <br /> pumping capacity of each pump minus the capacity of the largest pump. <br /> The proposed Sewer Lift Station LS-Cl should be designed to have a firm pump capacity of 593,236 GPD <br /> or 412 GPM to service the PWWFs of Area C1. The PWWF do not exceed 1.0 cfs(450 GPM)and therefore <br /> a low flow pump is not required. <br /> Table 6-2: Sewer Lift Station Area C1 (LS-C1)— Preliminary Firm Pumping Capacity Requirements <br /> Parameter Pumping Capacity <br /> Preliminary Required Firm Pumping Capacity 593,236 GPD or <br /> 412 GPM <br /> 6.3 Sewer Collection Area C2— Preliminary Steady State Results <br /> 6.3.1 Sewer Collection Area C2—Land Uses,Average Dry Weather Flows,and Peak Wet Weather Flows <br /> Sewer collection area C2 is proposed to be located in the northwestern portion of Phase II and is bounded <br /> by collection area Al in the south, the Old River distributary in the north and west, and collection area Al <br /> east. Area C2 is approximately 372 acres comprised of low and medium density residential units, parks, a <br /> school, and a fire station. As shown in Table 6-3, the ADWF from just collection area A2 is 301,327 GPD. <br /> Sewage from collection area C1 will be collected and pumped into collection area C2 along B street. As <br /> described in Section 3.1.2, the PWWFs of any pipe are determined based on its ADWF. In other words, <br /> the PWWFs of Area C1 and C2 is not equal to the sum of individual area's PWWFs, but moreover equal to <br /> the sum of the ADWFs from area C1 and C2 with the respective peaking factor applied. Per the City <br /> Standards, the PWWF conveyed to the proposed sewer lift station C2 (LS-C2) is 1,168,388 GPD based on <br /> the combined ADWF from areas C1 and C2. <br /> 22 <br />