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IT CORPORATION April 8, 1985 Mr. J. Kelly Williamson Kayo Oil Company 1221 East Main Street Chattanooga, Tennessee 37408 Dear Mr. Williamson: SUBJECT: SECONDARY SOILS INVESTIGATION AND MONITORING WELL INSTALLATIONS SUMMARY REPORT: Douglas Self-Service Station 900 South Cherokee Lane Lodi , California . Store No. 05659 IT Project No. ME0004 This report summarizes the work accomplished regarding the soils profile examination and monitoring well installation at the Douglas Self-Service station at 900 South Cherokee Lane in Lodi , California. The investiga- tion was conducted to determine the extent of the hydrocarbons encountered during the original investigation at this station. This investigation was previously discussed in a letter report dated March 14, 1985. On-site work commenced at 11:45 a.m. , March 26, 1985, with the drilling of two additional borings, which were completed by 3 p.m. that day. As a result of our findings from our March 26, 1985, drilling, it was determined that two additional borings were necessary to better define the extent of hydrocarbons at the subject site. Boring locations are shown in Figure 1. The soil borings were drilled with a truck-mounted 8-inch hollow-stem auger to a depth of 20 feet (MW-5 and MW-6) and 30 feet (MW-7) . Soil samples were collected at 5-foot intervals with a California sampler, recorded by an IT Corporation engineer, and classi- fied using the Unified Soil Classification System (Plate 1) . All three borings were completed as monitoring wells of the type shown on the individual bore logs, Plates 2-4. A petroleum odor, accompanied by LEL readings of 17 percent in MW-5 and 6 percent in MW-6, was detected at a depth of 15 feet. Declining LEL values were noted with increasing depth in both MW-5 and MW-6. Values decreased to 6 and 3 percent, respectively, at a depth of 20 feet in Regional Office IT Corporation• 1815 Arnold Drip e- Martinez California 94553 •415-228-8400