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1 <br /> In August 1995, Smith Environmental conducted a subsurface site investigation to further define the <br /> extent of contamination in groundwater at the site Swath Environmental supervised the installation of <br />' monitoring wells MW4, MW-5 and MW-6 These three new wells were developed and sampled <br /> along with monitoring wells MW-1, MW-2, and MW-3 Analytical results of groundwater samples <br />' from the sic monitoring wells indicated the presence of elevated concentrations of petroleum <br /> hydrocarbons in the vicinity of wells MW-3 and MW-6, on the northeast corner of the site <br /> SAMPLING ACTIVITIES <br /> On January 12, 1996, groundwater samples were collected by Smith Environmental personnel <br /> from monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5 and MW-6 The locations of the <br /> monitoring wells are shown on Figure 2 <br /> Prior to collection of groundwater samples, the depth to water, pH, electrical conductivity, and <br /> temperature were measured in the monitoring wells and recorded A minimum of three well <br /> casing volumes were purged from each well prior to sampling The wells were allowed to recover <br /> and samples were collected from each well using dedicated disposable bailers <br /> The groundwater samples collected from each well were submitted to Argon Mobile Laboratories <br /> (ELAP cert no 1873) for analysis of total petroleum hydrocarbons as gasoline (TPHg) and <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA methods 50301801518020 <br /> Groundwater well purge and sample logs are provided in Appendix A <br /> ANALYTICAL RESULTS <br />' Petroleum hydrocarbon constituents were not detected above laboratory method detection limits <br /> in the samples collected from wells MW-1, MW-2, MW-4 and MW-5 The samples collected <br />' from wells MW-3 and MW-6 contained TPHg at concentrations of 38,000 micrograms per liter <br /> [ugA] and 4,000 ug/l, respectively, and benzene at concentrations of 19 ug/l and 1 3 ug/l, <br /> respectively A summary of analytical results is presented in Table 1 Laboratory data sheets and <br />' cham-of-custody documentation are provided in Appendix B <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW-1, MW-2, MW-3, MW-4 MW-5 and <br />' MW-6 on January 12, 1996 Water levels ranged from 26 01 to 26 81 feet below the tops of the <br /> • <br /> 2 SIYITH <br /> L300781QUARTLYIIQR-1996 doc <br />