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I i � <br /> CLEARWATER <br /> • G R O U P I N C <br /> began. At this time the interval between measurements will be increased to <br /> once every hour until the test ends In addition to recording water level <br /> measurements, the flow rate will also be recorded after each gauging round is <br /> completed <br /> Once the test is completed and the pump is shut off, the exact time and the <br /> total gallons displayed on the flow meter will be recorded If performing a <br /> recharge test, the water level within each well within the vicinity of the <br /> pumping well will be measured continuously for the first 30 minutes of the <br /> test, and then every 15 minutes until the water levels stabilize The exact <br /> time will be recorded for each measurement taken <br /> An effluent water sample shall be collected during the test to assist in the <br /> design of a water treatment system Additional sampling will occur of <br /> required by conditions stated in the sewer discharge permit. If water is being <br /> stored in a holding tank, appropriate samples will be collected per disposal <br /> rrequirements The water will be removed to an appropriate disposal facility <br /> by a Incensed hauler <br /> - A <br /> 7A _-VA!,UA uON <br /> Data obtained from groundwater pump/recovery tests can be evaluated using <br /> various graphical and numerical methods, depending on flow (steady or <br /> unsteady state) well construction (fully or partially penetrating) and aquifer <br /> type (confined, leaky, unconfined, semiconfined and fractured bedrock) <br /> Aquifer and well properties will be determined as accurately as possible prior <br /> to conducting the analyses, in order to select the appropriate method for <br /> evaluating the data In some cases, it may be useful to evaluate the data using <br /> more than one method to confirm the aquifer and well characteristics Some <br />' calculations and evaluations may be performed with the aid of the "Aquifer <br /> Test ToolboxTM", a collection of aquifer test worksheets developed by Creative <br /> Scientific Applications <br /> A majority of the pump tests will be conducted using partially penetrating <br /> wells in unconfined aquifers under steady state conditions In general, the <br /> curve-fitting method presented by Neuman (1975) or by Boulton (1954) will be <br /> used to evaluate transmissivity, storativity and vertical hydraulic <br /> conductivity under these conditions (the Boulton method assumes nonsteady <br /> state conditions) The Stretltsova's curve-fitting method presented by <br /> Kruseman and de Ridder (1990) may also be used for unconfined conditions <br /> In addition, the steady state well equation may be applied (Todd, 1980) to <br /> evaluate the hydraulic conductivity (away from the pumping well) <br /> Constant-Discharge Aquufer Test Page 3 of 5 December 16,1994 <br />