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1 1 ppm ethylbenzene, 7 3 ppm total xylenes, 0 14 ppm MTBE, and 1 1 <br /> ppm TBA The TPH-D chromatogram exhibited a pattern similar to that of <br /> aged gasoline No concentrations of benzene, diisopropyl ether (DIPE), <br /> ethyl-t-butyl ether (ETBE), tert-amyl methyl ether (TAME), ethanol or <br /> methanol were detected above laboratory reporting limits The certified <br /> analytical report and chain of custody are presented in Appendix C <br /> 5 . 0 FEASIBILITY TESTS <br /> Feasibility tests included a step drawdown test, constant rate pumping <br /> test, air sparging test and a dual-phase test <br /> 5A Stev Drawawn Pmninz Test <br /> The step drawdown test was conducted by Gary D Lowe, R G , CEG , <br />' C HG of H2O Geol in Livermore, California on August 19, 2000 A copy of <br /> the report for this test is presented in Appendix D Based on the results <br /> of the step-drawdown test, a pumping rate of 1 5 gallons per minute <br /> (gpm) was selected for the constant rate pump test A water sample was <br /> collected during this test to allow for an estimation of the hydrocarbon <br /> concentrations that will need to be treated during the operation of a <br /> possible interim water recovery/treatment system The sample was <br /> collected on August 17, 2000 and subsequently analyzed by Kiff <br /> Analytical, LLC of Davis, California (FLAP #2236) for TPH-G, BTEX, <br /> oxygenates and HVOCs by EPA Method 8260 The analytical data is <br /> tabulated as Table One in the Tables Section The certified analytical <br /> report and chain of custody is attached in Appendix E <br /> 5_2 Constant-Rate. Pumping Test <br /> A 1,000-minute constant rate pump test was conducted by Gary D Lowe, <br />' R G , CEG , C HG of H2O Geol in Livermore, California on August 20, <br /> 2000 A copy of the report for this test is presented 1n Appendix D <br /> Based on the results of the step-drawdown test, a pumping rate of 1 5 <br /> gpm was selected for the 1,000-minute constant rate pumping test <br /> The results of the constant rate pumping test show the mayor hydraulic <br /> conductivity of 133 feet per day oriented approximately N78W, the minor <br /> hydraulic conductivity of 82 feet per day oriented at a right angle to the <br /> mayor conductivity, and an average storage coefficient of 0 2764 <br /> Assuming a maximum pumping rate (Q) of 1 8 gpm (346 5 cubic feet p e r <br /> day), a saturated thickness (B) of 5 95 feet, and a potentxometric surface <br /> Frank's One Stop Interim Remediation System Workplan — September 2000 <br /> -10- <br />