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2.2 Groundwatci• Gradient <br /> The groundwater elevation was measured in all lour wells on October 28. fhe ground'.vater <br /> gradient is 0.4023 ft/ft to the northwest as depicted in Figure 1. This agrees reasonably well <br /> with the Previous gradient data presented in the WESTON PAR of May 17, 1991. <br /> 3.0 ANALYTICAL RESULTS <br /> Table 1 presents a summary of the analytical results of the groundwater sampling for BTEX, <br /> TPH-G conducted September 27, 1991 and the sampling for total lead conducted October <br /> 22, 1991. A complete analytical report is Presented in Appendix B. To facilitate comparison <br /> with previous sampling events, the results from sampling events completed in Jury 1991 are <br /> also presented. <br /> TABLE 1 <br /> MW-4 Groundwater Analytical Results <br /> Well'..D. Sample EPA 602 ,ug/L (ppb) EPA 8015 EPA 7421 <br /> Date mglL mg/L <br /> ]ppm) (ppm) <br /> Benzene Toluene Ethyl- Xyl,ne TPH-G Total ! <br /> benzene Lead <br /> 07/10/91 ND' ND ND ND ND NA <br /> MW-4 <br /> 07/I6/91 ND ND ND ND ND NA <br /> 09/27,191 ND ND ND ND ND NA <br /> 09/27/91 ND ND ND ND - N'A NA <br /> Trip Blank <br /> 10/22/91 NA' NA NA NA NA ND <br /> 1. ND = Not detected at a concentration greater than the reporting limit. <br /> 2. NA = Not analyzed. <br /> September and October 1991 Analytical Results. <br /> As shown in Table 1, no BTE? c-r TPH-G was detected in the grouldwater sample collected <br /> September 27. This result c,�,itsistent with previous results fr-)--, MW-4, as shown in Table <br /> 1. Sample TB-1, trip blank, was also "non-detect" for BTEX. Analysis for total lead in the <br /> MW-4 groundwater also showed no detectable concentrations. <br /> 4.0 IN'T'ERPRETATION OF FUNDINGS <br /> This section presents a discussion of analytical results within the context of historical trends <br /> and other Pertinent factors. <br /> RVI S":(W/A-'VWV 4 <br /> :I f41 UI <br />