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Mr Kyle Christie Project 0805-140 03 • July 23, 1996 Page 2 line (S-6-PLI), gasoline hydrocarbons were detected in this sample RESNA installed one vapor extraction well (VW-4) near the product release Total petroleum hydrocarbons as gasoline (TPHG), and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were below laboratory detection liruts in soil collected at 11 feet, 26 feet, and 46 feet below ground surface (bgs) RESNA began monitoring the groundwater in wells MW-1 through MW-4 on October 30, 1991 (RESNA, June 26, 1991, Report No 30004-4) Wells MW-5 and MW-6 were added to the monitoring program in March 1993 and December 1993, respectively Dissolved hydrocarbons have been detected in wells MW-1 and MW-5 since monitoring began In March 1992, EA Engineering, Science and Technology (EA) observed removal of the oil-water separator/clanfier (EA, August 1992, Report No 80633 01) EA collected one soil sample from beneath the former oil-water separator and one sample from the concrete Analytical results from the soil samples indicated that oil and grease (quantified as total oil and grease [TOGI) were present Concentrations of volatile organic compounds, serruvolatile organic compounds, and polychlorinated biphenyls (PCBs) were below detection limits Total metals were also below detection limits, with the exception of • arsenic and barium, which were detected at concentrations of 0 0051 and 0 12 parts per million, respectively On March 2, 1992, RESNA conducted a vapor extraction test at the site (RESNA, June 15, 1992, Report No 30004-5) Results of the test indicated that soil beneath the site can be remediated by vapor extraction, and the evaluated radius of influence was 30 feet In May 1994, RESNA submitted a problem assessment report (RESNA, May 11, 1994, Report No 30004-8) to the San Joaquin County Public Health Services (SJCPHS) and the California Regional Water Quality Control Board (CRWQCB) A final remediation plan will be prepared by EMCON, and subsequent remediation will be implemented in the future PROPOSED WORK The following scope of work presents EMCON's procedures associated with the removal of the USTs and product delivery lines, the abandonment of one monitoring well, and the installation of one dual completion vapor extraction well This work will be conducted in accordance with the Tri-Regional Guidelines Field procedures are presented as an appendix to this document According to information supplied by ARCO, there are five USTs at the site two 4,000-gallon tanks, one 6,000-gallon tank, one I0,000-gallon tank • that stored leaded gasoline, and one 280-gallon waste-oil tank (see Figure 2) Based on conversations with the city of Stockton (City), the City i5 widening Hammer Lane, SAC\N TiM805\08051400 31)S-95 ikls