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i z <br /> • Cambria Environmental Technology, Inc (Cambria) evaluated water-level measurement data <br /> and prepared a ground water contour map (Plate 2) Ground water flow direction varies <br /> across the site The hydraulic gradient was calculated to be approximately 0 017 <br /> • Ground water samples collected from Wells MW-I through MW-10 contained TPPH <br /> concentrations ranging from ND to 18,000 ppb, benzene concentrations ranging from ND to <br /> 390 ppb, and MTBE concentrations ranging from ND to 110 ppb A chemical concentration <br /> map is presented on Plate 2 <br /> Quarterly Sampling <br /> Monitoring Wells MW-1 through MW-10 were sampled and analyzed for Total Purgeable Petroleum <br /> Hydrocarbons quantified as gasoline (TPPH) according to EPA Method 8015 (Modified), benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), and MTBE according to EPA Method 8020 Additionally, a <br /> duplicate sample and an equipment blank were prepared and analyzed for quality control purposes <br /> Field monitoring data and chemical analytical data are summarized in Table I Blaine's ground water <br /> 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 /> If you have any questions regarding the contents of this document, please call <br /> Sincerely, <br /> Cambria Environmental Technology, Inc <br /> Mike Prinz <br /> Staff nginer o4�passl0y4f� <br /> X44 ��4 JU, ya, <br /> Ck <br /> Diane Lundquist, P E NO 048725 <br /> Senior Engineer <br /> VIV <br /> C46725 OF CA <br /> • <br /> 240-0778 2 <br />