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18 June 2001 <br /> AGE-NC Project No. 98-0432 <br /> Page 3 of 6 <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 8015 Modified, <br /> • Volatile aromatic compounds,including benzene, toluene, ethylbenzene and xylene(BTEX) <br /> and methyl-tertiary butyl ether(MTBE) by EPA Method 8020 and <br /> ' Fuel additive compounds - di--isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butariol <br /> (TBA); methanol,.ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in <br /> accordance with EPA Method 8260 Modified. <br /> 2.2. AQUIFER PUMPING ANALYSIS <br /> The maximum ground water draw-down in the observation wells for each pump test was plotted <br /> against the distance of each well from the extraction point on semi-logarithmic paper. Utilizing the <br /> Distance-Drawdown Method (Jacob straight-line method), general transmissivity, storativity and <br /> hydraulic'conductivity values were determined. <br /> For the pumping test conducted at well EW-1, the draw down data collected in observation well <br /> MW-1 through MW-6 were used to determine the aquifer properties. Ground water levels in <br /> observation wells within twice the aquifer thickness or within 60 feet, appeared to be influenced <br /> ' during the pumping tests. Results of the aquifer ground water pumping test are summarized in <br /> Table 1; a site plan depicting the inferred_ radius of influence during the 23 May 2001 pumping test <br /> is depicted in Figure 2. <br />•' Utilizing data collected from monitoring wells, transmissivity value was calculated at 700 W/day <br /> or 5,223 gallon/day/feet, a storativity value calculated at 0.047 and the hydraulic conductivity value <br /> ' of 0.123 cm/s. A semi-logarithmic plot of draw-down versus distance is depicted in Appendix C.The <br /> observed radius of influence(ROI) was 95 feet utilizing field data. <br /> Advanced GeoEnvironmeaai,Inc. <br />