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r 15 December 2000 • AGE-NC Project No 95-0103 Page 4 of 4 Following casing removal,the probe borings will be permanently sealed to prevent vertical migration of contaminants Soil borings shall be abandoned by backfilling with portland from the total depth to surface grade 32 GROUND WATER EXTRACTION TESTS Two drawdown pilot tests will be performed to evaluate feasibility of ground water extraction and to remove hydrocarbon mass through ground water extraction and to reduce ground water levels to enhance soil vapor extraction A downhole water pump will be utilized to induce a decline in static water level in the extraction well, pressure transducers will be deployed in surrounding wells to measure difference in ground water levels before well pumping and at set time intervals during well pumping A ground water test will be conducted to extract water from the vapor extraction well(VE-6), ground water level observations will be collected from two temporary ground water depth/elevation monitoring points, soil vapor extraction wells VW-1 and ASO-1, and possibly from ground water monitoring well MW-3 r A second ground water tests will be later conducted to extract water from the monitoring well (MW- 4) ground water level observations will be collected from one temporary ground water depth/elevation monitoring point, soil vapor extraction wells VW-7 and VE-1, and possibly from ground water monitoring well MW-1 The ground water will be extracted utilizing a submersible, 2-inch diameter Grundfos Rediflow self- priming downhole pump The ground water pumping rate will remain constant to achieve the optimum pumping rate for the greatest drawdown influence During the pumping, the estimated ground water extraction flow rate be one-gallon per minute The ground water extraction pilot test will be performed for 24 hours to allow for stabilization of ground water drawdown Purged ground water will be containerized in a 9 000-gallon Baker tank, four ' grab" ground water samples will be collected from the inlet to the Baker tank for analysis for TPI-I-g, BTEX and MTBE in accordance with appropriate method The purged ground water will be discharged into the City of Stockton sewer system pending regulatory approval or be transported to a suitable hazardous waste facility The duration of the initial drawdown pilot test will be a minimum of 24 hours The proposed drawdown pilot test will be designed to obtain general aquifer characteristics hydraulic conductivity transmissivity well effectiveness (efficiency) and drawdown at a steady pumping rate