Laserfiche WebLink
Page 6 <br />Table 5. Summary of Existing Production Well Specific Capacities <br />tĞůů/ <br />Pumping <br />Rate <br />(gpm) <br />Well <br />ŝĂŵĞƚĞƌͬ <br />Slot Size <br />;/ŶĐŚĞƐͿ <br />Pumping <br />ƵƌĂƚŝŽŶ <br />;ŚƌͿ <br />;ĨƚͿ Q/s <br />(gpm/ft) <br />Top of <br />Screen (ft <br />bgs) <br />Bottom of <br />Screen (ft <br />bgs) <br />Hopyard 6 4,550 18/0.075 0.5 61 75 215 490 <br />Hopyard 7 1,200 22/0.085 8 101 12 150 415 <br />Hopyard 9 1,000 18/0.080 24 102 10 NA NA <br />Pleasanton 5 2,820 18/ <br />2 1/2 x 1/8 <br />100 23 123 149 650 <br />Pleasanton 6 3,052 18/ <br />2 1/2 x 1/8 <br />NA 28 109 165 647 <br />Pleasanton 7 4,000 18/ 68 115 35 120 440 <br />Pleasanton 8 20/0.085 200 490 <br />SFPUC A 1,200 18/0.070 12 88 14 196 320 <br />SFPUC B 2,100 18/0.070 10 93 23 189 326 <br />Evaluation of 30-ĂLJĂŶĚϵϬ-ĂLJ^ƉĞĐŝĨŝĐĂƉĂĐŝƚŝĞƐ <br />Due to the potential continuous operation of the new test well sites on a continuous basis for weeks to <br />months and associated slightly lower specific capacity values, an evaluation was conducted in terms of <br />the required difference in assumed well efficiency that is needed to maintain the same pumping <br />capacities. This evaluation provides both the pumping capacity using the longer-term specific capacity <br />combined with the original well efficiency assumptions, along with the estimated new well efficiency <br />required to maintain the original pumping capacity (Table 6). <br />The longer-term specific capacity was estimated based on straight-line projection of drawdown vs. time <br />(on semi-log paper) for constant rate pumping of the test well. It should be noted that unknown boundary <br />conditions (recharge or discharge) may occur at later time and not be reflected in projection of time- <br />drawdown data from an 8-hour test, which may result in higher or lower long-term specific capacities.