SU0013949 - Laserfiche WebLink

Home Browse Search

River Islands Development at Lathrop November 2020 Final Phase 2 Sewer Technical Report Rev 1 #6520 Table 6-7: Sewer Collection Area B2— Land Uses, ADWF, and PWWF Land Use Area B2 Sewer Flow Average Dry Total No of DU Factor Weather Flow Land Use or Acres (GPD/du or ac) (GPD) Low Density Residential (per DU) 1,091 200 218,200 Medium Density Residential (per DU) 789 180 142,020 High Density Residential (per DU) 1,641 170 278,970 Commercial (per acre) 56.0 590 33,016 Industrial (per acre) 0.0 355 0 Parks (per acre) 61.4 55 3,375 Schools/ Institutional (per acre) 30.0 1 245 7,350 Total Area B2 Average Dry Weather Flow 682,931 Total Area 131 Average Dry Weather Flow 650,870 Total Area 131 + B2 Average Dry Weather Flow 1,333,801 Peaking Factor 2.06 Peak Wet Weather Flow' 2,746,811 Notes: 1. PWWF shown is based on the ADWF from areas B1 and B2 conveyed to the proposed sewer lift station LS- B2 6.5.2 Sewer Lift Station B2 LS-132— Preliminary Firm Pumping Capacity Under normal operating conditions, the model results determined the Sewer Lift Station B2 should have a firm pumping capacity of 2,746,811 GPD or 1,908 GPM. Also a low flow pump designed for 95-191 GPM should be provided. Table 6-8: Sewer Lift Station Area B2— Preliminary Firm Pumping Capacity Requirements Parameter Pumping Capacity Low Flow Pump Capacity 95-191 GPM Preliminary Required Firm Pumping Capacity 2,746,811 GPD or 1,908 GPM At full buildout and under normal operating conditions, Table 6-9 summarizes ADWF and PWWF (firm pumping capacity) required for each lift station in Collection Area C1, C2, B1, & B2. Table 6-9: Summary of Collection Areas C1, C2, 131 & B2 Model Results Proposed Proposed Proposed Proposed Sewer Lift Sewer Lift Sewer Lift Sewer Lift Station Station Station Station Parameter LS-C1 LS-C2 LS-131 LS-132 Average Dry Weather Flow (GPD) 208,082 509,409 650,870 1,333,801 Peak Wet Weather Flow(GPD) 593,236 1,168,388 1,424,966 2,746,811 Low Flow Pump Required (Yes/No) No Yes Yes Yes 25