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�. v ASSOCIATESATC I NC . 2.7 Monitoring Well Development Groundwater monitoring wells MW4 and MW5 were developed on June 7, 2000. No free �— product was evident in well MW4 before or after the development of the well. After wells MW4 and MW5 had been developed, wells MW through MW5 were purged until the extracted water Y was relatively sediment free. Development/purge logs are included in Appendix D. Purgewater was temporarily stored on site in 55-gallon drums. After fluid levels had been allowed to stabilize, groundwater levels were obtained from wells MW 1 through MW5. Fluid levels were taken on June 7, 2000, utilizing an electronic water probe capable of measuring with an accuracy Lo of 11100 of a foot. Groundwater flowed to the southwest at 0.001 feet per feet. Groundwater elevation data are presented in Table 3. Ir Due to overhead lines and access restrictions, well MW6 was not installed until June 30, 2000. F The well was purged on July 13, 2000 until the extracted water was relatively sediment free. L. Purgewater was temporarily stored on site in 55-gallon drums. 2.8 Groundwater Monitorin2 Well Sampling and Analysis ,L On June 7, 2000, groundwater samples were collected from wells MWl through MW5. The samples were collected after purging a minimum of three well volumes and stabilization of electric conductivity, pH, and temperature. Field development/purge logs are presented in Appendix D. Subsequent to purging, groundwater was sampled and transferred to appropriate sample containers, using clean, disposable bailers with bottom emptying devices to reduce volatilization. Sample containers were then labeled with sample identification, placed on ice, and shipped under chain-of-custody to Argon Labs. The groundwater samples from wells MW 1 through MW5 were analyzed by Argon for TPHg, TPHd, BTEX, and MTBE by Methods 8015 and 8020, respectively. The groundwater sample from well MW5 was also analyzed for oxygenate fuel additives by EPA Method 8260. Groundwater analytical results are summarized in Table 2, and laboratory data sheets are presented in Appendix D. On July 13, 2000, a groundwater sample was collected from well MW6. The sample was collected after purging a minimum of three well volumes and stabilization of electric >L. conductivity, pH, and temperature. Field development/purge logs are presented in Appendix D. Subsequent to purging, groundwater was sampled and transferred to appropriate sample containers, using a clean, disposable bailer with a bottom emptying device to reduce LM volatilization. Sample containers were then labeled with sample identification, placed on ice, and shipped under chain-of-custody to Argon Labs. The groundwater sample from well MW6 was analyzed by Argon for TPHg, TPHd, BTEX, and MTBE by Methods 8015 and 8020, respectively. Groundwater analytical results are summarized in Table 2, and laboratory data sheets are presented in Appendix D. w:154.625001reportslsumiii.doc 5