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Before sampling, a minimum of three casing volumes of water was bailed from <br /> each groundwater monitoring well, until color, temperature, conductivity, and pH <br /> stabilized Single-use polyethylene bailers were used to collect groundwater <br /> samples Samples were placed in an appropriate set of laboratory provided sample <br /> vials For volatile organic analyses, 40 milliliter sample vials with a teflon backed <br /> silicone septa in an open top lid were used The sample vials were filled completely, <br /> avoiding all air bubbles and transported under chain-of-custody procedures at 4°C to <br /> BAFS <br /> ! 3.3 GROUNDWATER SAMPLE ANALYSIS AND RESULTS <br /> ' Groundwater samples were analyzed by BAFS for the following <br /> Analysis Method <br /> ' TPHd EPA 3550/GC FID <br /> Benzene, Toluene, Ethylbenzene, <br /> and Xylene (BTEX) EPA 5030/8020 <br /> No detectable concentrations of any of the analytes were reported in any of the three <br /> groundwater samples A summary of the analytical data is contained in Table 1 <br /> 3.4 GROUNDWATER GRADIENT <br /> On October 6, 1992 theroundwater elevations <br /> g were obtained from the wells This <br /> data is shown in Table 2 The groundwater gradient was determined to be directed <br /> ' North 8° East with a magnitude of 0 38 ft/100 ft The gradient direction is shown on <br /> the scaled site plan, Figure 3 <br /> 3.5 EQUIPMENT DECONTAMINATION AND WASTE HANDLING <br /> All down-hole drilling equipment was steam cleaned before use and between <br /> ' borings Sampling equipment was decontaminated before each use by the following <br /> triple rinse procedure <br /> 6 <br />