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r <br /> IS May 2001 <br /> AGE-NC Project No 97-0333 <br /> Page 4 of 7 <br /> feet towards the north) at 0 21 feet after 372 minutes of pumping operation (Appendix F) <br /> The maximum ground water draw-down in wells MW-1, MW-2, MW-6 and EW-1 versus the <br /> ' distance of each well from the extraction point were graphed on semi-loganthmic paper, utilizing <br /> the Distance-Drawdown Method(Jacob straight-lune method), general transmissivity, storativity and <br /> hydraulic conductivity values were determined (Appendix H) Ground water levels in observation <br /> wells MW-6, MW-2,MW-3 and MW-1 all appeared to be influenced with measurable draw-down <br /> during the pumping test <br /> ' Utilizing data colIectedfrom well EW-1, MW-1, MW-2, MW-3 and MW-6, a transmissivity value <br /> was calculated at 955_fl/dAy, a storativ ty value calculated at 0 032, a hydraulic conductivity value <br /> of 013 cm/s and a radius of influence projected at 140 feet utilizing a semi-logarithmic plot of <br /> draw-down versus distance (Appendix H and I) Results of the aquifer ground water pumping test <br /> are summarized in Table 1, a site plan depicting the radius of influence during the 05 April 2001 <br /> pumping test is depicted in Figure 5 <br /> • <br /> 32 EXTRACTED WATER SAMPLING PROCEDURES <br /> Approximately 4,100 gallons of purged water were generated during the aquifer ground water <br /> pumping test During the pumping test(4 20 PM, 350 minutes of pumping operation), a grab sample <br /> was collected prior to discharge into the 6,500 gallon Baker tank utilizing three 40-m1 EPA-approved <br /> VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and a one-liter amber <br /> ' bottle without preservative <br /> Following sample collection, each preserved sample was logged on a chain-of-custody form, placed <br /> in a chilled container and transported to a California Department of Health Services (DHS)-certified <br /> laboratory for analysis for <br /> ' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively)by EPA Method 5030/8015M, <br /> ' • Volatile aromatic compounds including benzene, toluene, ethylbenzene and xylene (BTEX) <br /> and methyl-tertiary butyl ether (MTBE) by EPA Method 8020, and <br /> • Volatile organic compounds including methanol, ethanol, ethylene dibromide (EDB) <br /> ' 1,2-dichloroethane(1,2-DCA), tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert <br /> butyl ether (ETBE), tert amyl methyl ether(TAME), and confirmation of MTBE by EPA <br /> Method 8260 <br /> ftdvanrcd(.eoFmiron menta! Int <br />