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ASS O C I ATE S I N C. The Theis type -curve solution for a confined aquifer, -results are presented in Table 3. The calculated stora confined condition. The storage coefficients for uncoi 0.3, while those for confined aquifers are typically be 1986). The average storage coefficient calculated average hydraulic conductivity value (0.00012 meters Table 3, fall within the average range for fine to cc 1986). A distance versus drawdown plot is shown on 334 Groundwater Sampling and Analysis Grab groundwater samples were collected from well at the completion of the pump test after the groundw Groundwater samples were transferred to appropriate bailers with bottom emptying devices to reduce vc labeled with sample identification, placed on ice, ar certified Argon Laboratories for chemical analysis. hydrocarbons as gasoline (TPHg) by EPA method xylenes (BTEX) by EPA method 8020; and methyl butyl ether (ETBE), di -isopropyl ether (DIPE), tertia (TAME), 1,2-dichloroethane (1,2 -DCA), and ethyl Groundwater analytical results are summarized in presented in Appendix C. 335 Results of Groundwater Pumping Test The observed maximum drawdown in each of the distance of each well from well EW -1. Based on A .. sites, the radius of influence is typically the point whet — - least 0.10 feet. The maximum drawdown in well M' influence (ROI) for groundwater extraction at the site Laboratory results of the groundwater samples Indic .. the samples collected from well EW -1 before and a of groundwater was extracted from well EW -1, concentrations of TPHg and BTEX from the t ® approximately 0.135 pounds of TPHg and 0.04 F groundwater extraction pilot test as shown below: r r wA259571reportslpumptest.doc 4 used to estimate aquifer parameters. The coefficient indicates the aquifer exists in a ied aquifers are typically between 0.01 and .-en 0.00005 and 0.005 (Driscoll page 210, .ng the Theis solution was 2.4E-3. The r second [m/s]) calculated and presented in ie sand (1 to 105 m/s) (Driscoll page 74, Lure 4. EW -1 prior to beginning the pump test and Iter elevation had been allowed to recharge. sample containers, using clean, disposable latilization. Sample containers were then d shipped under chain -of -custody to State - Samples were analyzed for total petroleum 015; benzene, toluene, ethyl benzene, and tertiary butyl ether (MTBE), ethyl tertiary .y butyl alcohol (TBA), tertiary amyl ether dibromide (EDB) by EPA method 8260. Table 2, and laboratory data sheets are bservation wells was plotted against the "s experience at groundwater remediation 3�0 the drawdown in the observation well is at 0.15 feet l -4 was which yields a radius of f approximately 90 feet (Figure 3). I that TPHg and BTEX were detected in the pump test. Assuming 5,280 gallons stated in Section 3.2, and averaging .ning and ending pump test samples, is of BTEX were removed during the