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' Working To Restore Nature <br /> 3_.4 Monitoring Well Development <br /> Newly installed groundwater monitoring wells MW4, MW5, MW6, and MW7 were developed <br /> on July 14 and 15, 1994 Each well was purged until the extracted water was relatively <br /> sediment free. Development/Purge logs are included as Appendix III. <br /> 3.5. Fluid Level Measurement <br /> ' After fluid levels had been allowed to stabilize, groundwater levels were obtained from all site <br /> wells on July 15 and 22, 1994 Levels were taken utilizing an electronic water/product <br /> interface probe capable of measuring with an accuracy of 1/100 of a foot. No free product <br /> was detected Groundwater elevation data is presented in Table 2 <br /> 2.6 Groundwater Sampling and Analysis <br /> 4n July 14 and 15, 1994, a groundwater sample was obtained from each on-site monitoring <br /> well. The sample was collected after purging and checking EC, pH, and temperature. These <br /> parameters were measured again after sample collection to ensure samples collected were <br /> representative of formation water. Field development/purge logs are presented in Appendix <br /> III <br /> Subsequent to purging, groundwater was transferred to appropriate sample containers, using <br /> ' clean, disposable bailers with bottom emptying devices to reduce volatilization. Sample <br /> containers were then labeled with sample identification, placed on ice, and shipped under <br /> ' chain-of-custody to Argon Mobile Labs <br /> ' The water samples were analyzed by Argon Mobile Labs for BTEX and TPHg by EPA <br /> methods 8020 and modified 8015, respectively The method detection limit at Argon Mobile <br /> Labs for BTEX and TPHg in water is 0 5 and 50 parts per billion (ppb), respectively. <br /> Groundwater analytical results are summarized in Table 3, and laboratory data sheets are <br /> presented in Appendix IV <br /> 1 <br /> 1500911REP0R'Ps15R-0894 FNL <br /> r <br />