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v 0 A s s O C I A T E 5 1 N C ti 2_3 Groundwater Monitorins Well Construction ' Soil boring MW7 was subsequently completed as a groundwater monitoring well to assess the extent of impacted groundwater, if any, beneath the site ' The well was constructed with 2-inch diameter PVC casing a to depth of 30 feet b s The p g screened interval of the well was positioned from approximately 5 feet above to 15 feet below the encountered water table to allow for seasonal water level fluctuations The well was secured with a traffic rated utility box and a pad lock The well construction details are depicted on the well log contained in Appendix A ' 2.4 Monitorinji Well Development tGroundwater monitoring well MW7 was developed on April 6, 2001 The well was purged until the extracted water was relatively sediment free Development/purge logs are included in ' Appendix C Purge water was temporarily stored on site in 55-gallon drums After water levels were allowed to stabilize, groundwater levels were obtained from all monitoring wells Groundwater levels were taken on April 6, 2001, utilizing an electronic water probe capable of measuring with an accuracy of 1/100 of a foot Groundwater elevation data are presented in Table 2 2_5 Groundwater Sampling and Analysis On April 6, 2001, groundwater samples were collected from wells MWI, MW2, MW3, MW4R, ' MW5, MW6, and MW7 The samples were collected after purging a minimum of three well volumes and stabilization of electncal conductivity, pH, and temperature Purge logs are presented in Appendix C Subsequent to purging, groundwater was sampled and transferred to ' appropriate sample containers, using a clean, disposable bailer with a bottom-emptying device to reduce volatilization Sample containers were then labeled with sample identification, placed on ice, and shipped under chain-of-custody to Argon Laboratories ' The groundwater samples from monitoring wells MW I, MW2, MW3, MW4R, MW5, MW6, and MW7 were analyzed by Argon Laboratories for TPHg, TPHd, benzene, toluene, ethylbenzene, ' xylenes (BTEX) and MTBE Monitoring well MW7 was further analyzed for oxygenate fuel additives Groundwater analytical results are summarized in Table 3, and laboratory data sheets are presented in Appendix B ' W 162514Veportslsup_sub_rnv doc 4