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SMTH <br /> SAMPLING ACTIVITIES <br /> On March 31, 1995, groundwater samples were collected by SMTH from three shallow <br /> monitoring wells (MW-1, MW-2 and MW-3) The locations of the monitoring wells are <br /> shown on Figure 2 <br /> Prior <br /> to collection of groundwater samples, the depth to water, pH, electrical conductivity, <br /> and temperature were measured in the monitoring wells and recorded A minimum of three <br /> twell casing volumes were purged from each well prior to sampling The wells were allowed <br /> to recover and samples were collected from each well using dedicated disposable bailers <br /> The groundwater samples collected from each well were submitted to Argon Mobile <br /> Laboratories (FLAP cert no 1873) for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg) and benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA methods <br /> 5030/801518020 <br /> Groundwater well purge and sample logs are provided in Appendix A <br /> ANALYTICAL RESULTS <br /> Petroleum hydrocarbon analytes were not detected above laboratory method detection limits in <br /> the samples collected from wells MWA and MW-2 The sample collected from well MW-3 <br /> ' contained concentrations of TPHg (26,000 micrograms per later [ug/1]), benzene (180 ug/l), <br /> toluene (3,100 ug/1), ethylbenzene (420 ug/1), and xylenes (2,200 ug/l). A summary of <br /> analytical results is presented in Table 1 Laboratory data sheets and chain-of-custody <br /> documentation are provided in Appendix B <br /> 1 GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW-1, MW-2 and MW-3 on March 31, <br /> 1995 Water levels ranged from 26 55 to 26 92 feet below the tops of the well casing <br /> elevations, representing an average increase in the water table elevation of approximately 1.29 <br /> 1 feet since December 1994 The water level data were used to develop the groundwater <br /> elevation contour map (Figure 2) Assuming that honzontal isotropic conditions prevail, <br /> groundwater in the uppermost aquifer beneath the site flowed in a southeast direction The <br /> average hydraulic gradient on March 31, 1995 was calculated to be 0 02 ft/ft or approximately <br /> 106 ft/mile A summary of groundwater monitoring data is presented in Table 2. <br /> z <br /> 1500781QUARTLYIIQR-1995 doc <br />