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Subsequent to installation, wellhead elevations and locations were surveyed to allow lateral and vertical control for data reduction Surveying was performed under the direction of a California rregistered engineer t3.3 Fluid Level Measurement After fluid levels had been allowed to stabilize groundwater levels were obtained from respective monitoring wells on March 2, 1992 Levels were taken utilizing an electronic water level probe capable of measuring with an accuracy of 1/20 of an inch No free product was detected 3.4 Groundwater Sampling and Analysis Groundwater monitoring wells were developed using a pneumatic pump in conjunction with a surgeblock Water was purged from each well until the extracted water was relatively sediment ; free Wells MWi and MW3 were developed and sampled on February 25, 1992 Well MW2 was developed and sampled on March 2, 1992 Immediately following well development, a groundwater sample was retrieved from each well Stabilization of EC, pH, and temperature were checked after purging and before and after ; sample collection to ensure samples collected were representative of formation water Field purge logs are presented in Appendix IV Water sample collection and preservation was conducted in accordance with RESNA's QA/QC Plan, groundwater sampling protocol Samples were transferred to appropriate sample containers, using clean, disposable bailers with bottom emptying devices to reduce volatilization Sample containers were then labelled with sample identification, placed on ice, and shipped under chain-of-custody to RESNA Environmental Laboratories (DHS #1211) The water samples were analyzed by RESNA Environmental Laboratories for BTEX and TPHG by EPA methods 8020 and modified 8015, respectively The method detection limit at RESNA Environmental regarding BTEX and TPHG in water is 0 5 and 50 ppb, respectively Analytical results are summarized in Table 3 Laboratory data sheets are presented in Appendix V 1 ' R-61292 TL 5