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08/22/2000 16 18 2094671118 AGE STOCKTON PAGE 04/07 <br /> . 21 August 2000 <br /> AGE-NC Project No 96-0254 <br /> Page 2 of 3 <br /> 3 0 SCOPE OF WORK <br /> AGE proposes to perforin a limited ground water extraction (pump)test to determine the viability <br /> of ground water extraction at the site The proposed test will be designed to obtain general aquifer <br /> characteristics such as hydraulic conductivity,transmissivity, drawdown and radius of influence at <br /> a static,pumping rate Data collected during the test will be used to evaluate groundwater remediation <br /> methods that may be applied at the site <br /> 4.0. PROCEDURES <br /> All field procedures will be overseen by an AGB representative and reporting is conducted under the <br /> supervision of a California Registered Geologist <br /> A drawdown pilot test will be performed to evaluate feasibility of ground water extraction and radius <br /> of ground water influence from a single well A submersible pump will be used to extract water from <br /> MW-IB, to induce a decline in the static water level in the extraction well <br /> Monitoring well MW-1B was screened from approximately 5 to 15 feet bsg, with a two-inch casing <br /> within a 10-inch soil boring Currently approximately 8 feet of static water reside in the well casing, <br /> screened within primarily sand and silty sediments <br /> Pressure transducers will be placed in wells MW1A/B and MW-7 to monitor the ground water <br /> depths before and during pumping A Solinst water level meter will also be used to monitor ground <br /> water depths to confirm and calibrate pressure transducer data Nater elevation data will be collected <br /> with pressure transducers ever minute over the duration of the pump test and depth to ground water <br /> in each well will be collected hourly suing a Solinst water level meter <br /> Ground water will be extracted at a rate of approximately 1 gallon per minute The pump test will <br /> last approximately 8 hours The extraction rate may vary, depending on the drawdown induced <br /> during the field work if the ground water extraction test is interrupted by low water levels or a purge <br /> down of the water within the well borings and casing, then the test will be restarted at half the <br /> proposed rate of extraction <br /> All extracted groundwater will be stored in a temporary, above-ground (Baker-type), storage tank <br /> Two "grab" ground water samples will be collected from the Baker tank for analysis for the site <br /> specific chemicals of concern The purged ground water will be treated and discharged into the City <br /> of Tracy sewer system pending regulatory approval, or be transported to a suitable non-hazardous <br /> waste disposal/recycling facility <br /> Advanced Geo$nvironmeattil,Inc <br />