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r - ke 31 August 2000 AGE Project No 96-0232 rPage 10 of 25 r 2 4 GROUND WATER DEPTH AND FLOW DIRECTION I Review of historical depth to ground water maps published by the San Joaquin County Flood Control r and Water Conservation District(FCD&WCD)dating back to 1971 suggests that ground water depth near the site has fluctuated between approximately 5 and 15 feet bsg, review of regional ground water elevation maps published by the FCD&WCD(1998)suggest a southeast to south ground water rflow direction Based on thirteen ground water monitoring events recorded at the site between July 1996 and June r 2000, depth to ground water measurements have fluctuated between 3 and 15 feet bsg, gradient has been nearly horizontal at the site, ranging between 0 001 and 0 01 Ground water flow direction has been inferred to be towards the north-northeast-northwest on four occasions (May 97, February 98, INovember 98 and March 2000), towards the west-northwest on one occasion (July 1998), towards the east-northeast on one occasion(February 2000), towards the south-southwest-southeast on two ' occasions (July and August 1996), locally varying between northeast and southwest on one occasion (February 1999) and locally varying between northwest and southeast on one occasion (June 1999) 3.0. AQUIFER PUMP TESTS On 14 March 2000, a three-stage aquifer step draw-down pump test was performed at the site to evaluate general ground water aquifer characteristics and to evaluate ground water draw-down at various pumping rates On 20, 21 and 24 July 2000, a four-stage aquifer pump test was performed at the site to evaluate general ground water aquifer characteristics from the"First Aquifer Zone" and the"Second Aquifer Zone"at constant pumping rates The First Aquifer Zone was defined by AGE (Quarterly Report- Second Quarter 2000) as generally being the hydrologic unit located between 5 and 35 feet bsg The Second Aquifer Zone was defined by AGE (Quarterly Report- Second Quarter 2000) as generally, being the hydrologic unit located between 35 and 60 feet bsg I3 1 AQUIFER STEP DRAW-DOWN PUMP TEST, 14 MARCH 2000 The aquifer step draw-down pump test consisted of extracting ground water from well MW-1 Iutilizing a 2-inch diameter Grundfos Redi-flo pump The first stage of the pump test consisted of pumping ground water at a rate of 4 3 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 Iwater at a rate of 3 GPM The pump test utilized pressure transducers that were deployed in well MW-1 at a depth of 18 5 feet bsg and in wells MW-2, MW-4 and MW-6A at a depth of 14 5 feet bsg Advanced GeoEIInronmental,Inc I