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Working To Restore Nature <br /> SAMPLING ACTIVITIES <br /> r On December 19, 1994, groundwater samples were collected by RFSNA from three shallow <br /> {I monitoring wells (MW-1, MW-2 and MW-3). The locations of the monitoring wells are <br /> shown on Plate 2 <br /> Prior 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 /> well casing volumes were purged from each well prior to sampling. The wells were allowed <br /> lto 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 (ELAP cert no 1873) for analysis of total petroleum hydrocarbons as gasoline <br /> (TPHg) and benzene, toluene, ethylbenzene, and xylenes (BTEX) utilizing EPA methods <br /> 50301801518020 <br /> Groundwater well purge and sample logs are provided in Appendix A <br /> ANALYTICAL RESULTS <br /> All petroleum hydrocarbon analytes for the sample collected from well MW-1 were reported <br /> below laboratory method detection limits The sample collected from well MW-2 contained <br /> Iconcentrations of TPHg (460 micrograms per liter [ug/1]), toluene (11 ug/1), ethylbenzene (2 6 <br /> ug/1), and xylenes (46 ug/1) The sample collected from well MW-3 contained concentrations <br /> of TPHg (46,000 ug/1), benzene (46 ug/1), toluene (5,000 ug/1), ethylbenzene (560 ug/1), and <br /> xylenes (4,200 ug/1) A summary of analytical results is presented in Table 1 Laboratory <br /> data sheets and chain-of-custody documentation are provided in Appendix B <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from wells MW-1, MW-2 and MW-3 on December <br /> 19, 1994 Water levels ranged from 27 84 to 28 21 feet below the tops of the well casing <br /> elevations, representing an average increase in the water table elevation of approximately 1 53 <br /> feet since September 1994 The water level data were used to develop the groundwater <br /> elevation contour map (Plate 3) Assuming that horizontal isotropic conditions prevail, <br /> groundwater in the uppermost aquifer beneath the site flowed in a southeast direction The <br /> z <br /> 1500781QUARTLYI4QR-1994 dor. <br />