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Canteen Facility August 31, 2000 <br /> Quarterly Groundwater Monitoring Report Page 4 <br />. INVESTIGATION SUMMARY and CONCLUSIONS <br /> Sampling and analysis was performed in March 2000 to evaluate the current concentrations of <br /> petroleum hydrocarbons of on-Site groundwater Based on the results, AES has developed the <br /> following conclusions <br /> • Monitor wells MW-3, MW-3A, MW-3D, MW 10, MW 12, MW 13, MW 13A, and <br /> MW13B had detectable concentrations that exceeded the target cleanup criteria of at <br /> least one of the following constituents benzene, toluene, ethylbenzene, xylenes, and <br /> TPH(g) <br /> • Groundwater impacts appear to be confined onsite, since offsite monitor wells MW-8 <br /> and MW-9 do not have detectable BTEX constituents The majority of the <br /> groundwater impacts are centered on the MW-3 and MW-13 series wells <br /> RECOMMENDATIONS <br /> AES recommends the following for the Canteen Facility <br /> • Conduct quarterly groundwater monitoring and reporting, to include measurement of <br /> depth to groundwater in each well, monitor well status, preparation of a <br /> potentiometric surface contour map, calculated gradient, and approximate rate of <br /> groundwater movement Groundwater samples will be analyzed for BTEX, TPH(g), <br /> and the five oxygenates (Tertiary Butyl Alcohol [TBA], Methyl Tertiary Butyl Ether <br /> [MTBE], Di-isopropyl ether [DIPE], Ethyl Tertiary Butyl Ether [ETBE], and Tertiary <br /> Amyl Methyl Ether [TAME]) by EPA methods 8020, 8015 modified, and 8260B, <br /> respectively <br /> • Prepare a work plan for regulatory review and approval to complete the investigative <br /> effort and an evaluation of preliminary remediation options for the site <br />