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a I IT CORPORATION April 17, 1985 Mr. J. Kelly Williamson Kayo Oil Company 1121 East Main Street , Chattanooga, Tennessee 37408 Dear Mr. Williamson: SUBJECT: ASSESSMENT OF THE CONTAMINANT PLUME Fast Gas Self-Service Station 800 East Highway 12 Lodi , California Store NO. 05660 IT Project No. ME0004 M This report reformats the data presentec in the March 14 and April 8, 1984 reports. The extent of contamination is presented on five foot level maps and a crude worse case estimate of the amount of hydrocarbon in the soils is made. Remedial alterna ives that could be applied to the site are presented with cost estimates and a recommended course of action is outlined. i Figures 1 through 4 show the percent lower explosive limit values for the soils samples at 5-foot intervals f om the surface to a depth of 45 feet. Figure 3 shows the shallowest contamination to be at a depth of 15 feet adjacent to the tanks, indicating that the source of the hydrocarbons is probably the tanks, or spillage when the tanks were j filled. No other contamination is indicated until the 35-foot level , { where the plume is found in three borings, MW-7, MW-6, and MW-9. The low reading in MW-9 suggests that this is the edge of the plume, and the lack of contamination in MW-9 at 40 feet confirms this. Contamination is found in MW-1, MW-7, and MW-6 at the 4( -foot level . The water table at the station was at a level of 36 feet below ground surface on April 15, 1985. Tables 1 and 2 show the two sets of water level measurements that have been made at. the site. Monitor well MW-1 had 0.2 feet of product floating on the surface of the water on April 15. The pattern of contamination indicates that the source of the hydrocar- bons is in the area of the tanks and that the hydrocarbons moved essen- tially straight down until encountering the water table, where the " plumes began to spread laterally. Since there is contamination at both the 35- and 40-foot level , it appears that the water table fluctuates over this interval . Regional Offic 1 IT Corporation• 1815 Arnold Drive• Martinez, California 94553.415-228-8400 r