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�DGfD� <br /> A GROUND WATER CONSULTANCY <br /> W E L L IP 1E;R F ORMA N C E T E S T R E S U L T S <br /> W 6 variable rate well performance test performed November 26 , 1991 <br /> b tween 0830 and 1630 hours . Depth to static water was 4 34 feet below <br /> casing top at 0830 hours ( approximately 3 . 3 feet below well pad, 2 . 6 feet <br /> balow ground surface) . <br /> 11 e graph below shows controlled flow rates and observed drawdowns at <br /> transient condition times during the test. Also shown is the aquifer and <br /> s 1 ne ( = BQ + CQP) . Pro3ection significantly beyond the field of <br /> the data poi is is con3ectural because of limiting conditions at very low <br /> flow rates a at flow rates approaching the maximum flow rate of the <br /> aquifer-well stem. <br /> � <br /> 2 <br /> m <br /> 1 00 -yy <br /> D Drawdown feet r/ H <br /> q - Plow Rate, GPH <br /> eq - Aquifer Coss J d <br /> 6 <br /> COP Wall Loss , <br /> H C P ar•50 Coe111cients <br /> - 0 <br /> H 9 _ <br /> C - 1 95E-09 1 <br /> P - 5 967 3 <br /> 0 2 <br /> 10 � <br /> L 6 <br /> CD 3- <br /> E 2 <br /> 4.3 <br /> � 1 <br /> C 6 <br /> 6 <br /> m <br /> 3 <br /> Q) <br /> C 2 <br /> L <br /> f ^ 0. 1 <br /> 41- <br /> 2 3 4 6 6789 2 S i b 6769 2 <br /> 1 10 100 <br /> Fl ow Re to Ln ge I I on s per m Ln u to <br /> This test represents equlfer-well system condltione at the time St was conducted and those <br /> imposed by the equipment employed Well yield is a function of aquifer criaracteristics neat <br /> the well including storage fedturee and well design Well performance over time is a <br /> • [unction of pumpinq-Plent operation [eatures and history wall screen and filter pack <br /> condition and groundwater/aquifer matrix geochemistry and geochemical (and blogaochemScal) <br /> reactions to the change in conditions Imposed by the wall system All of these ractpr� change <br /> through time therefore well performance will 4150 vary over time <br /> P 0 Box 2165 ■ Llvermore, Californla 94551 • 510-373-9211 <br />