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ICV0 A S S b C I A T E S I N C The scope of work for the pilot test consisted of extraction of groundwater from monito>ing well MW2 for approximately 24 hours, and monitoring the changes in groundwater level in well MW2 and observation wells MW I, MW3, MW4, and MW5 3_1 Aquifer Pumping Test The aquifer test was conducted over a 24-hour period b extracting groundwater at a constant q p Y g rate from well MW2 The test was performed to determine the aquifer properties and the radius of influence for groundwater pumping Prior to initiating groundwater pumping, water levels were measured in each site well Measurements were collected using electronic sounders capable of measuring depths to one- hundredth of a foot (0 01 feet) Prior to initiating the test, ATC place transducers in the extraction well MW2 and observation wells MW 1, MW3, and MW4 to measure and tabulate the depth to water in the wells at frequent intervals Because well MW5 is located across Acacia Street which is the path of the school buses, well MW5 was monitored manually with a depth to water probe ATC obtained approval from Mr Dale Ramey of the City of Ripon Public Works Department to discharge the extracted groundwater directly to the City of Ripon sewer system The pumped groundwater was discharged into the sanitary sewer using an access point approximately 100 feet south of well MW1 Pumping test field notes are contained in Appendix C 3.2 Analysis of A uifer Test Data The constant discharge aquifer test is the most useful method to determine the aquifer parameters of hydraulic conductivity (K), transmissivity (T), and storage coefficient (S) in the water-bearing layer The groundwater pumping rate during the pilot test, as measured by the flow meter, averaged approximately 5 5 gallons per minute (gpm) The collected data were analyzed using AQTESOLVT"i groundwater modeling software and a recovery test analysis 3.3 Analysis of Aquifer Test Data using AOTESOLVTM The aquifer parameters transmissivity and storage coefficient were calculated using AQTESOLVTM software Drawdown data were used in solving for the aquifer parameters Data from three observation wells were used for analysis because only wells MW1, MW3, and MW4 showed significant drawdown during the aquifer test Groundwater elevations measured in well MW5 showed no significant drawdown Groundwater elevations measured during the test were recorded by transducers and are contained in Appendix D with the AQTESOLV rm input data The aquifer thickness was assumed to be an average of 14 feet, based on approximate length of the water • column in the wells w\130991reportslsumweh doc 4