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' 10 December 2001 • AGE NC Project No 95-0143 Page 6 of 10 ' 3 2 24-HOUR CONSTANT RATE PUMPING TEST Prior to initiation of the test, the depth-to-ground water was measured In the extraction well EW-3 and in observation wells EW-4, MW-3, MW-7, MW-9, VW-1, VW-2 and VW-4 using a Solinst water level meter During the pumping test depth to water was measured in extraction well EW-3 at 30-minute intervals and in the seven observation wells at 1-hour intervals Due to the nature of operations at the site,AGE personnel could not monitor the wells between 480 minutes(18 00) and 1,320 minutes (08 00) of pumping operation Additionally, the pump test utilized 7/8-inch diameter, model 3001 Solinst Levelogger pressure transducers that were deployed in wells EW-3, MW-7 and MW-9,a transducer was also placed in EW-4 to recordbarometric pressure Each pressure transducer was preprogrammed prior to the pumping test to log water levels at one-minute intervals Because of the limited number of transducers utilized,maximum depth to water measurements recorded using the Solinst water level meter were used to evaluate aquifer characteristics, data collected by the transducers was used for comparative purposes and to document cone of depression stabilization during the pumping test Copies of pressure transducer water level data logged from EW-3,MW-7, MW-9 and EW-4 (barometric pressure) are in Appendices E, 1~, G and H, respectively The pumping test consisted of extracting ground water from extraction well EW-3 utilizing a 4-inch diameter submersible Grundfos Redi-flo pump A constant rate of 8 gpm was utilized for the test Approximately 11,150 gallons of water were removed from EW-3 during the 24-hour test 3 2 1 Pump Test Results Based on the results of the 8-hour step-drawdown aquifer pumping test,a pumping rate of 8 gpmwas utilized for the 24-hour constant i ate pumping test using a 4-inch Grundfos Redi-flo submersible pump During the 24-hour pumping test, maximum ground water drawn-down in extraction well EW-3 was observed to be 7 90 feet after 1,335 minutes of pumping operation (Table 4) However, the depth to water measurement recorded in EW-3 using the water level meter may be inaccurate due Ito interference, the measuring tape may have become entangled with the pump wiring and support cable The maximum draw-down value recorded by the transducer deployed in EW-3 was 6 36 feet after 478 minutes Maximum draw-down was measured In the observation wells as follows EW-4 (located 10 feet toward the north) at 0 72 feet after 1,335 minutes of pumpmg operation, • MW-3 (located 12 feet toward the northeast) at 0 52 feet after 1,335 minutes of pumping operation, Advanced GeoEnvironmental,Inc f