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CLEARWATER <br /> G R 0 L P, I N C <br /> depression within the pumping well No water will be extracted from the shallow <br /> water bearing zone via the test well for 12--18 hours following the completion of the <br /> step test in order to allow for formation equilibration <br /> A constant-rate discharge test will be initiated following formation equilibration <br /> The constant rate test will involve the extraction of water from the test well at the <br /> rate specified by the step test. Water will be extracted from this well for a period of <br /> 12 hours Water levels will be measured continuously in the pumping well and a <br /> neighboring monitoring well during the test with pressure transducers and an <br /> oil/water interface probe or water level meter, likely with 30 or 60 minute spacings <br /> Product thickness in those monitoring wells with separate phase hydrocarbons will <br /> be measured at regular intervals during the test Groundwater samples will be <br /> collected during the first and last hour of the test from a sampling port in the water <br /> effluent line near the pumping well The samples will be forwarded to the project <br /> lab for analysis of concentrations TPHg, TPHd, and benzene, toluene, ethylbenzene <br /> and xylene isomers BTEX <br /> The pumping test will be completed following 12 hours of groundwater extraction, <br /> z'xor when drawdown has stabilized in MW-2, whichever occurs first Stabilization is <br /> defiled for the purposes of this test as measured drawdown of less than a tenth of <br /> the cumulative drawdown observed after the second hour of pumping for three <br /> consecutive hours For example, of a total of one foot of drawdown is measured in <br /> MW-2 after two hours of pumping, the test will be concluded following three <br /> consecutive hourly measurements of an incremental increase in drawdown of 0 10 <br /> or less <br /> A recovery test will be conducted following the completion of the constant rate <br /> discharge test This test will consist simply of monitoring the recovery of water <br /> levels in MW-2 and the pumping well after the pump has been shut off This <br /> recovery will be recorded using the data logger, and will occur prior to the removal <br /> of any of the pumping equipment from the recovery well <br /> Pumping equipment will consist of an electric submersible pump capable of <br /> producing low to moderate flows of water Based on the purge logs generated <br /> during groundwater sampling, it is anticipated that the rate of groundwater <br /> extraction will be between 1 and 5 gpm Recovered water will be directed to a <br /> temporary aboveground holding tank during the test Based on the anticipated <br />' flowrate, it is expected that a tank with a 5,000 gallon capacity will be sufficient for <br /> the needs of this test Water in the tank will be sampled following the completion <br /> of the test, with collected samples directed to the project laboratory for analysis of <br /> fuel hydrocarbon compounds in accordance with the requirements of local water <br /> disposal facilities Water will be disposed of following acceptance by the appropriate <br /> facility, and the rented container returned <br /> D-107/PILOT TEST WP 4 <br />