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Ei3 IT COUPORATION 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: Econo Self Service Station 4325 E. Washington Street Stockton, California Store: #05748 IT Project No. 3183 This report summarizes the work accomplished regarding the soil profile examination and monitoring well installation at the Econo self service station at 4325 E. Washington Street in Stockton, California. The investigation was conducted to provide basic subsurface information at the site and included soil sampling at five-foot intervals. Soil pro- file information will be of assistance in the interpretation of possible contaminant migration. Before work began, a well installation permit was obtained from the San Joaquin local health district. On site work commenced at 8:30 a.m. on February 27, 1985, by drilling four borings within the property boundary encircling the underground tanks, as shown on Figure 1. The soil borings were drilled with a truck-mounted 8-inch hollow-stem auger to depths between 29.5 and 30.5 feet. The soils were sampled at five-foot intervals, classified, and recorded according to the Unified Soils Classification System (Plate I). Drilling ceased at 2:10 p.m. that same day. All four borings were backfilled in their entirety with cement-bentonite grout. Ground water was not encountered in any of the borings. Petroleum LEL readings of 10%, 22% and 25% were recorded at the 10-, 15- and 20-foot levels, respectively, of boring DH-1. Samples at the 25- and 30-foot had-zero-percent.-LEL...readings.-....-The remaining-three-bores...did- -- encounter hydrocarbons at any depth. The soil profiles were character- ized by sandy silts and clays in bores DH-2, DH-3, and DH-4, with a Regional Office IT Corperalion•1 B l5 Arno!d Drive-Marlinez.Calilornia 4x553• 15-228-8400