SITE INFORMATION AND CORRESPONDENCE FILE 1

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EXCEITECH 41674 CHRISTY STREET FREMONT, CA 94538 PHONE (415) 659-0404 • CONTR. LIC. NO. 464324 November 16, 1987 Mr. Larry Hardison Stockton Service Station Equipment Company, Inc. P.O. Box 508 Stockton, CA 95201 Re: Proposal for Soil Sampling Plan Beneath Subsurface Storage Tank Exceltech Quote No. 6504G Dear Mr. Hardison: This letter presents our proposal to drill two (2) exploratory borings and collect soil samples for analysis at 4491 West Durham Ferry Road in Tracy, California. The purpose of the sampling is to acertain whether or not leakage has occurred in an in-place 1,000 gallon subsurface gasoline storage tank. It is our understanding that the soil sampling is required for an in-place tank closure, and the San Joaquin Local Health district requires two (2) samples be the collected. Two exploratory borings will be drilled under the tank at approximately a 45-degree angle. The borings will be drilled perpendicular to the tank axis, one at each end, so that the bottom of the boring will be directly under the tank. Soil samples will be collected at five foot intervals during drilling using a modified California sampler equipped with brass liners. Samples will be logged, sealed with foil, capped, and packed in ice for transport to the laboratory. All cuttings will be drummed; disposal of cutting is the client's responsibility. The borehole will be backfilled with grout upon completion. The lowermost sample from each boring (collected from approximately 2 feet beneath the tank bottom) will be analyzed for Total Volatile Hydrocarbons and Benzene, Toluene and Xylenes at a state- certified analytical laboratory using EPA-approved methods. Exceltech will prepare a letter report complete with sample location, borehole log and copy of the chemical analysis report. The above work is proposed for a fixed fee of - It is our understanding that the boring site is easily accessible and not obstructed by overhead wires and underground utilities, and the price is dependent upon this assumption. The San Joaguin County Local Health District will need to review this proposed soil sampling plan prior to starting work. A drilling date will be designated when the permit is approved. We will advise you of the date at that time. If you have any questions, please contact our office. Sincerely, EXCELTEC�H, INC. Stephen Costello Christopher M. Palmer, C.E.G. 1262 Staff Geologist Manager, Geotechnical Services SC/CMP/da I