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Ms Margaret Lagorio Project Z298 00 <br /> i April 28, 1994 <br /> Page 2 <br /> Constituent Groundwater Soil <br /> Benzene 100 ppb' 2 50 ppm2 <br /> Toluene 2000 ppb 2 50 ppm <br /> Ethylbenzene 680 ppb 2 50 ppm <br /> Total Xylenes 440 ppb 2 50 ppm <br /> - ppb parts per billion <br /> 2 - ppm parts per million <br /> REVISED CLEANUP LEVELS <br /> In response to the PHS/EHD's request to adopt more stringent cleanup levels for soil and <br /> groundwater, and based on the telephone conversation with PHS/EHD, EMCON proposes <br /> the following preliminary cleanup level goals <br /> Constituent Groundwater Soil <br /> Benzene < 0 5 ppb < 5 0 ppb <br /> Toluene < 0 5 ppb < 5 0 ppb <br /> Ethylbenzene < 0 5 ppb < 5 0 ppb <br /> Total Xylenes < 0 5 ppb < 5 0 ppb <br /> The cleanup levels identified above are the chemical detection limits for the respective <br /> compounds The remediation method is designed to approach these levels within the <br /> technical constraints of soil and groundwater remediation PHS/EHD and EMCON <br /> recognize that the final cleanup levels will be based on the review of monitoring data <br /> collected during system operation and discussions with the PHS/EHD <br /> REMEDIATION APPROACH <br /> The FRP prepared by Aegis indicated that it would use the Remediation Services <br /> International (RSI), Spray Aeration and Vapor Extraction (SAVE) remediation system to <br /> remediate soil and groundwater Aegis, in the March 1993 FRP, proposed using the <br /> existing 0 2-inch slotted 4-inch diameter horizontal polyvinyl chloride (PVC) ventilation <br /> fields for the extraction of petroleum hydrocarbon impacted soil vapors, and using <br /> monitoring wells MW-1 through MW-4 to extract impacted groundwater <br /> I Ntrcknos\Z27800b-94 mam 2 <br />