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River Islands Development at Lathrop January 2021 <br /> Final River Islands Potable Water Technical Report—Rev 3 #6520 <br /> 2.5 Potable Water Pumping Capacity Requirements — Phase I City of Lathrop Potable Water <br /> Storage and Booster Pump Station at River Islands <br /> Per Section 4-4.2 in the City Standards, PW distribution systems shall be sized to adequately, dependably, <br /> and safely supply potable water demands under maximum conditions. The City Standards define maximum <br /> conditions as the higher of either the maximum day demands plus the largest fire flow requirement or peak <br /> hour demands. At full buildout, the largest fire flow requirement is 3,000 GPM and the MDD is 5,186 GPM. <br /> This is equal to 9,186 GPM which is less the PHD of 10,372 GPM. Therefore, at full buildout conditions, <br /> the required firm pumping capacity of the River Islands distribution system must be at least 10,372 GPM <br /> (PHD) as required by the City's Standards. Section 4-5.7 and Appendix H in the City Standards defines <br /> firm pumping capacity at a pump station as the total pumping capacity of all the pumps minus the capacity <br /> of the largest pump. <br /> The Phase I City of Lathrop PW Pump Station at River Islands (also known as Phase I BPS and previously <br /> referred to as Site B) was designed with a firm pumping capacity equal to 10,000 GPM at full build out <br /> conditions. Table 2-7 below lists the rated capacities and number of pumps the Phase I BPS will be <br /> installed with at full build out conditions. <br /> Table 2-7: Phase I City of Lathrop Potable Water Storage and Booster Pump Station at River <br /> Islands— Firm Pumping Capacity <br /> Pumping <br /> Capacity <br /> (gpm) @ 197' Motor Rated Motor <br /> Pump Number TDH Horsepower Drive Status <br /> Variable <br /> Small Booster Pump#1 2,000 125 Frequency Duty <br /> Drive <br /> Variable <br /> Small Booster Pump#2 2,000 125 Frequency Duty <br /> Drive <br /> Variable <br /> Small Booster Pump#3 2,000 125 Frequency Duty <br /> Drive <br /> Large Booster Pump#1 4,000 250 Soft Starter Duty <br /> Large Booster Pump#2 4,000 250 Soft Starter Standby <br /> Total Firm Pumping Capacity Phase I BPS 10,000 <br /> Notes: <br /> 1. Phase I BPS will be designed to operate in a 4 duty+ 1 standby configuration, with one of the large booster <br /> pumps acting as the standby pump. <br /> 11 <br />