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FOX ENVIRONMENTAL SERVICES, INC. 8015 West Cliff Drive • Knoxville, TN 37919 • (6151690-1996 August 1, 1985 Mr. Kelly Williamson Kayo Oil Company 1221 E. Main Street Chattanooga, TN 37408 RE: Fast Gas Station 800 E. Highway 12 Lodi, CA 95240 Dear Mr. Williamson: During the week of July 8, 1985, two additi nal groundwater monitoring wells were installed at the Fast Gas station located at 800 E. Highway 12 in Lodi, _ California. The purpose of the new wells was to further define the plume of product that ' exists on the groundwater beneath this loca ion. On July 10, 1985,, using a truck mounted B61 mobil drill, equipped witi a 7 inch hollow stem continuous flight auger, a bore hole was drilled to a lepth of 67 feet where a stiff clayey tense was encountered. A 2 inch sch dule 40 PVC monitor well was installed to a depth of 65 feet, utilizing 10 feet of slotted screen and 35 feet of solid pipe. This combination of screen and pipe allows for 10 feet of rise and 20 feet of fall in the groundwa er. This monitor well is desig- nated MW#14 and is located 211 feet north of MW#4. MW#4 is a shallow well with a depth of 20 feet, which does not allow for groundwater assessment. Through- out the boring of this well, split spoon samples were taken at 5 foot intervals and at no time were there any detectable signs of hydrocarbons in the samples or in the cuttings. Monitor well MW#15, located 15 feet west ani 4 feet north of MW#I, was drilled to a depth of 75 feet and a monitor well with a total depth of 67 feet 10 inches was installed, utilizing 30 feet of slotted screen and 37 feet 10 inches of solid pipe. Split spoon samples were taken every 5 feet and there was no de- tectable hydrocarbon presence-down to 40 feet where a distinct odor and an explosimete.r reading of 40% L.E.L. were rec rded. At 45 feet, hydrocarbon odor was still present and an L.E.L. reading of 35% was recorded. Groundwater- was encountered at 43.5 feet in the course Df drilling and a grab sample of the groundwater was void of any visible hydrocarbon. Subsequent to the installation of MW#14 and MW#15 a physical inspection was made of the underground storage tanks and leaks were discovered on the leaded rhe u�la and regular unleaded tanks where a retrofit had been made during the connecting of the vapor recovery system. It is not possible to calculate the amount of product that has been lost due to this unfortunate situation, but all indications are that the loss was sizable. The leaks have been repaired and the entire product distribution system has been tested for tightness.