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J <br /> CAMBRIA <br /> iCambria Environmental Technology, Inc (Cambria) evaluated water-level <br /> measurement data and prepared a ground water contour map (Plate 2) Ground water <br /> flow direction varies across the site The hydraulic gradient ranges from 0 005 to <br /> 001 <br /> • Ground water samples collected from Wells MW-1 through MW-10 contained TPPH <br /> concentrations ranging from ND to 6,700 ppb, benzene concentrations ranging from <br /> ND to 93 ppb, and MTBE concentrations ranging from ND to 230 ppb A chemical <br /> concentration map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-10 were sampled and analyzed for Total Purgeable <br /> Petroleum Hydrocarbons quantified as gasoline (TPPH) according to EPA Method 8015 <br /> (Modified), benzene, toluene, ethylbenzene, xylenes (BTEX), and MTBE according to EPA <br /> Method 8020 Additionally, a duplicate sample and an equipment blank were prepared and <br /> analyzed for quality control purposes <br />• Field monitoring data and chemical analytical data are summarized in Table 1 Blaine's <br /> ground water monitoring report is presented in Appendix A <br /> Conclusions and Recommendations <br /> Wells MW-1, MW-3 through MW-5, MW-7, and MW-8 have shown decreasing quantities of <br /> TPPH for approximately the last four years Quarterly monitoring, sampling, and reporting <br /> will continue on the established schedule <br /> r- <br /> i <br /> 240-0778 2 <br />