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e IT CORPORATION March 14, 1985 Mr. J. Kelly Williamson Kayo Oil Company 1221 E. Main Street Chattanooga, Tennessee 37408 Dear Mr. Williamson: SUBJECT: SOILS BORING AND MONITOR WELL INSTALLATION SUMMARY REPORT FOR: Douglas Self Service Station 900 S. Cherokee Lane Lodi , California • Store #05659 IT Project No. 3183 This report summarizes the work accomplished regarding the soil profile examination and monitoring well installation at the Douglas service station at 900 S. Cherokee Lane in Lodi , California. The investigation was conducted to provide basic subsurface soil and hydrogeologic infor- mation at the site and included soil sampling at five-foot intervals. Soil profile information will be of assistance in the interpretation of possible contaminant migration. Before work began, well permits were obtained from the San Joaquin local health district. On-site work commenced at 3:40 p.m. , February 27, 1985, and was con- tinued the following day until 1:15 p.m. , at which time four borings had been drilled within the property boundary encircling the underground tanks, as 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-2, MW-3, MW-4), and in one case, to 55 feet (MW-1) . The soils were sampled at five-foot intervals and then classified and recorded according to the Unified Soils Classification System (Plate 1) . All four borings were completed as monitoring wells of the type shown on the individual bore logs, Plates 2-5. Ground water was encountered at 49 feet in MW-1 but was not observed in the other three shallower wells. Trace hydrocarbons were noted as shallow as 2-3 feet in MW-2 and 35 feet in MW-1. Petroleum odor and LEL readings up to 22 percent occur below the 15-foot level of MW-3 and MW-4, with decreasing values of 13 percent and 6 percent at 20 feet in Regional Office IT Corporation. 1815 Arnold Drive• Martinez California 94553•415-228-8400