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r <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement data <br /> and prepared a ground water contour map (Plate 2) Ground water appears to flow generally <br /> easterly at an approximate hydraulic gradient of 0 02 with a mound around Well MW-2 <br /> • Ground water samples collected from Wells MW-1 through MW-10 contained TPPH <br /> concentrations ranging from ND to 24,000 ppb, benzene concentrations ranging from ND to <br /> 650 ppb, and MTBE concentrations ranging from ND to 94 ppb A chemical concentration <br /> map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-I0 were sampled and analyzed for Total Purgeable Petroleum <br /> Hydrocarbons quantified as gasoline (TPPH) and methanol according to EPA Method 8015 <br /> (Modified), benzene, toluene, ethylbenzene, and xylenes (BTEX) according to EPA Method 8020, <br /> and oxygenate compounds according to EPA Method 8260 Additionally, a duplicate sample and an <br /> equipment blank were prepared and analyzed for quality control purposes <br /> Field monitoring data and chemical analytical data are summarized in Table 1 Blaine's quarterly <br /> ground water monitoring report is presented in Appendix A <br /> • Quarterly monitoring, sampling, and reporting will continue on the established schedule to monitor <br /> plume stability and natural attenuation <br /> 375 2 <br />