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T ' 4 f 01 May 2000 • AGE-NC Project No 96-0232 PaYge 2 of 11 I' evaluate general ground water aquifer characteristics and to evaluate ground water draw-down at various pumping rates 2 1 GROUND WATER PUMP TEST PROCEDURES The pump test consisted of extracting ground water from well MW-1 utilizing a 2-inch diameter Grundfos Redi-flo pump The extracted ground water was pumped into a 5,900-gallon aboveground t Baker storage tank The pump test utilized pressure transducers that were deployed in well MW-1 Y at a depth of 181/2 feet bsg and in wells MW-2, MW-4 and MW-6A at a depth of 14'/2 feet bsg The , pressure transducers were utilized to measure the difference in ground water levels during ground water pumping, ground water level measurements were continuously recorded utilizing an Aquistar, data logger (see Appendix A) The first stage of the pump test consisted of pumping ground water at a rate of 4 3 gallons per minute " (GPM), the second stage of the pump test consisted of pumping ground water at a rate of 3 5 GPM, the third stage of the pump test consisted of pumping ground water at a rate of 3 GPM Ground water pumping flow rate was determined by measuring the time required to fill a 5-gallon bucket from the pumping dischai ae hose Prior to initiating stages two and three, groundwater was allo\N ed to fully recharge in all observed wells to original ground water levels prroi to pumping f 1 5 Draw-down versus time far well MW-1 was graphed on semi-logrithinic paper for stages 1 2 and 3 of the pump test (Appendix B) Utilizing the Tacob straight-line method, the transmissivity for each Istage of the pump test was determined (Appendix C) Ground water levels fi om wells MW-2, MW-4 ' and MW-6A did not appear to be influenced during the pump test 1 22 GROUND WATER PUIMP TEST RESULTS , I , Prior to pumping for the first stage of the pump test, a baseline static ground water level fiorn MW-1 was recoi ded at 6 49 feet bsg During the first stage of the pump test (pump rate at 4 3 GPM), ground water was drawn below the,pressure transducer in MW-1 after 19 minutes of pumping operation, no 1 measurable draw-down was observed from wells MW„-2'(located 120 feet towards the east), MW-4 (located 95 feet towards the north) or MW-6A (located 75 feet towards the south) during the first step of the pump test A transmissivity value frons well MW-1 was calculated at 135 gal/day-ft 1 Prior to pumping actin rues for the second stage,of the pump test, a baseline static ground water level from MW-1 vas recorded at 6 50 feet bsg During the second stage of the pump test (pump rate at • 3 5 GPM), the greatest ground water draw-down was observed at 6 91 feet after 11 minutes of ' pumping operation, due to an equipment malfunction, the test was terminated after 1 l minutes of I Adiairccd CcoEn%ironmenfal,inc r r