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CLEARWAOTER G R O U P, I N C. began. At this time the interval between measurements will.be increased to once every hour until the test ends: In addition to recording water level measurements, the flow rate will.also be recorded after,each gauging round-is completed. ; Once the test is completed and the pump is shut off, the exact time and the. '- total he. '- total gallons displayed on"the flow meter will be recorded. .If performing a. recharge test, the water level within "each well within the vicinity of the ' pumping well will be .measured continuously for the first 30 minutes of the test, and then every '15 minutes until .the water levels stabilize. The exact time will be recorded for each ineasurement taken. An effluent .water sample, shall be collected during the test to assist in the design- of a water treatment system. . .Additional sampling will occur if I required by conditions stated in the sewer discharge permit. I If water is being stored in a holding tank, appropriate "samples will be collected per disposal requirements. 'The water will be removed to an appropriate disposal facility ' by a licensed hauler. DATA EVALUATION ' Data-obtained from groundwater pump/recovery tests can be evaluated using various graphical and numerical methods, ' depending on flow (steady or unsteady state) well construction (fully or partially penetrating) and aquifer . 1 type (confined, leaky, unconfined, semiconfined and fractured bedrock). Aquifer and well properties will be determined as accurately as possible prior to conducting the analyses, in order to select the appropriate method' for evaluating the data. In some cases, it may be useful to evaluate the data_using more than one method to confirm the aquifer and well characteristics. Some calculations and evaluations may be performed with the aid of the "Aquifer ' Test ToolboxTM", a collection of aquifer test worksheets developed by Creative Scientific Applications. ' A majority of the pump tests will be conducted using partially penetrating wells in unconfined aquifers under steady state conditions. In general, the curve-fitting method presented by Neuman (1975) or by Boulton (1954) will be . used to evaluate transmissivity, storativity and 'vertical hydraulic . conductivity under these conditions (the Boulton method assumes nonsteady state conditions). The Stretltsova's curve-fitting method presented by Kruseman and de. Ridder (1990) may also be used for unconfined conditions. In addition, the steady state well equation may be applied (Todd, 1980) to ' evaluate the hydraulic conductivity (away from the pumping well): Corkstant-Discharge Aquifer Test Page 3 of 5 December 16,1994 1