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i <br /> Subject:Remedial Investigation Work Plan-Addendum <br /> Reference:Facility Site Code:2371 <br /> February 8,2008 <br /> Page 2 of 7 <br /> • Fuel Ox enates - <br /> Methyl tertiary butyl ether(MTBE), <br /> di-Isopropyl ether(DIPS), <br /> Ethyl tertiary butyl ether(ETBE), <br /> tertiary Amyl methyl ether(TAME), and <br /> tertiary Butyl alcohol(TBA);and <br /> • Fuel Additives- <br /> 1,2-Dibromoethane(1,2-DBA or EDB) and <br /> 1,2-Dichloroethane(1,2-DCA or EDC). <br /> The analyses were performed according to EPA Method 8260B. The analytical data are <br /> presented in Tables 1 and 2. The analytical data indicate that residual or possibly off-site <br /> source petroleum hydrocarbon contamination(at various concentrations) exists in the soil <br /> and groundwater samples obtained from the borings as follows: <br /> • Boring C6- Soil samples from 35-50 feet bgs <br /> - Groundwater grab sample at 53 feet bgs; <br /> • Boring C7 - Soil samples from 33-45 feet bgs <br /> - Groundwater grab samples were non-detect at 30 feet and 50 feet <br /> bgs; and <br /> • Boring CS - Soil samples from 35-45 feet bgs <br /> - Groundwater grab sample at 54 feet bgs. <br /> Completed soil borings were filled and sealed with a grout mixture consisting of neat <br /> Portland cement in accordance with SJCEHD and California Department of Water <br /> Resources (DWR) requirements. A SJCEHD inspector observed and approved the <br /> grouting process. <br /> Soil encountered in borings C6, C7, and C8 consisted mainly of silt, clay, and sand. <br /> Groundwater was typically encountered in saturated flowing sand at approximate depths <br /> of 27 to 34 feet bgs in the first groundwater zone and at depths ranging from <br /> approximately 48.5 to 54.5 feet bgs in the second groundwater zone. In the borings <br /> where depths to groundwater levels recovered or equilibrated, the depth to water <br /> subsequently measured at depths ranging from approximately 25 to 26 feet bgs in the first <br /> groundwater zone and 27 to 56.5 in the second groundwater zone. Soil borings, geologic <br /> cross sections, and a detailed evaluation of the hydrogeologic and analytical data will be <br /> presented in the subsequent report to be submitted upon completion of this phase of the <br /> investigation. <br /> Based on analytical and hydrogeological data obtained during the first phase of the <br /> investigation, PSC proposes to install three 2-inch diameter groundwater monitoring <br /> wells (MW-2D, MW-3D, and MW-5D). The three wells will be used to monitor the <br /> PHILIP ENVIRONMENTAL SERVICES CORPORATION <br /> 210 West Sand Bank Road,Columbia,IL 62236 <br /> (618)281-1543 Fax(618)281-7020 <br />