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, <br /> V N <br /> Six-inch Extraction Well EW-1 at 574 West Grantline Road, Tracy, San <br /> Joaquin County, California Variable rate performance test performed <br /> August 29, 2001 (rate below 3 GPM) and October- 31 , 2001 (rates above <br /> 5 GPM) Depth to static water was 5 . 71 feet below casing top at 09: 05 <br /> hours on 11/31/01 (6 18 feet below ground surface) . <br /> The graph below shows controlled nominal flow rates and observed <br /> drawdowns at transient condition times during the test Projections <br /> based on the polynomial D = BQ + CQ". <br /> Total Available Drawdown 11 96 feet BOTTOM OF WELL <br /> PUMP INTAKE <br /> 1000 <br /> D = Drawdown, feet <br /> Q = Flow Rate, GPM <br /> 8,C,P are coefficients – <br /> For observed data <br /> S = 0 1930 C O s wdcvvn <br /> C _ 0 022621 — <br /> P = 2 4943 <br /> 1 00 <br /> v <br /> IcuS toa <br /> V - — <br /> 0 I ! <br /> 4 <br /> 010 - <br /> ---- - - — <br /> > - <br /> L <br /> � — — � <br /> C, -- <br /> 001 <br /> 2 3 4 56789 2 3 4 56789 2 <br /> 01 10 100 <br /> a Step Drawdown Test Data Flow Pok in Q�llors per mini)te <br /> This test represents aquiter-veli system Gond.tions at the time it was conducted and those imposed by the equipment employea Yield <br /> is a function of aquifer characteristics near the well including storage features both in the well and in the aquifer )e g <br /> dewatering) and the well design Per`ormance over time is a function of pumping-plant operation features and histor\ sczeen and <br /> filter pack condition and groundwater/aquifer matrix geochemistry and geoehemical (and biogeochemical) reactions to the change <br /> in conditions imposed by the well 513tem All of these factors change through time therefore performance will also e-v over <br /> time <br /> PUMPING WELL (EW-1) FIGURE <br /> H 2 0 G E ® L p STEP TEST OF AUGUST 29 AND OCTOBER 31, 2001 <br /> A GROUND WAWAl ER CONSULTANCY 674 WEST GRANTLINE ROAD, TRACY, CALIFORNIA <br />