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' f J • 12 February 2002 AGE-NC Project No 97-0312 :•a IPage 15 of 18 containers will be filled using the appropriate disposable sampling attachment which allows 3, controlled flow out of the bottom of the bailer by lifting up on the check valve 4 6 4 Sample Handling Ground water samples will be collected into laboratory supplied containers Ground water samples r for TPH-g,BTEX and fuel oxygenating compound analyses will be collected into 40-m1 VOA vials containing 0 5 ml of hydrochloric acid as preservative Ground water samples for TPH-d will be collected into Miter amber bottles with a preservative Following collection the samples will be ; �+ placed on ice and kept in a cooler until delivered to the laboratory for analysis Chain-of-custody "f protocols will be used to document sample custody transfer from the field to the 'analytical I laboratory A chain-of-custody form will accompany the samples n 47 GROUND WATER EXTRACTION FEASIBILITY TESTS • A pilot test will be performed to evaluate feasibility of ground water extraction and radius of ground water influence from a single well A 4-inch submersible pump will be used to extract water from the proposed extraction well (EW-1) to induce a decline in the static water level in the extraction well Based on well recharge rates noted during quarterly monitoring events, a pumping rate of approximately 2 to 5 gallons per minute (gpm) is anticipated Extraction well EW-1 will be screened from approximately 55 to 75 feet bsg, with a 4-inch casing I within a 10-inch soil boring Pressure transducers will be placed inEW-1, ground monitoring wells UST-5 ,UST-2,UST-4 and in the proposed shallow-screen cluster well to monitor the ground water levels before and during pumping Well construction and location details are presented in Table 7 r A Solinst water level meter will also be used to manually monitor ground water depths to confirm ` and calibrate pressure transducer data Water elevation data will be collected with pressure transducers at one-minute intervals for the duration of the pump test and depth to ground water in each well will be measured hourly using a Solinst water level meter r , r r ` ` AGE proposes an 8-hour step drawdown pump test and a 24-hour aquifer constant rate pump test I to be conducted at the site'to evaluate the general zones of capture (radius of influence) achievable during ground water extraction at the site and to obtain general aquifer characteristics such as hydraulic conductivity, storativity, transmissivity, and draw-down at a constant pumping rate A constant ground water pumping rate for the 24-hour aquifer pump test will be determined from the results of the 8-hour pump test and available storage for produced water Should ground water conditions stabilize prior to completion of the 24-hour,test, the test will be terminated following a . minimum of 16 hours f I Advanced&oEnvironmental,Inc � t