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ET <br />EXCELTECH <br />41638 CHRISTY STREET • FREMONT, CA 94538 <br />PHONE (415) 659-0404 CONTR. LIC. NO. 464324 <br />T 1'-k1 — V A- ^ E k <br />el6-ttT <br />APR 10 1987 <br />Stocktox 500 ice Station Equipment Company, Inc. ENVIROMENTAL HEALTH April 8 N198526G <br />Stockton, CA 94201 `y- PERMIT/SERVICES, <br />Attn: Mr. Larry Hardison <br />Re: Soil Sampling Beneath Subsurface Storage Tank <br />Dear Mr. Hardison: <br />At your request, on Tuesday, March 3, 1987, Exceltech sent a crew to the Tri -Valley Growers site at <br />3200 E. Eight Mile Road, in San Joaquin County, California to drill an exploratory boring and collect <br />soil samples from beneath a subsurface diesel storage tank. <br />The boring was initiated 10 feet from the center of the tank and drilled at approximately a 60 degree <br />angle so that the bottom of the boring was directly (6 feet) under the tank at approximately 18 feet in <br />depth. The boring was drilled at a 60 degree angle rather than the tentatively proposed 45 degree angle <br />to avoid damaging a water supply line. Soil samples were collected at five foot intervals using a <br />modified California sampler with brass liners. The samples were logged on a chain of custody, sealed <br />with foil, capped, labeled and packed on ice for transportation to the laboratory. Upon completion of <br />sampling the borehole was sealed with a bentonite and cement grout slurry. <br />At the request of Ms. Laurie Cottula of the San Joaquin Local Health District, the two lowermost samples <br />were analyzed at a state certified laboratory for Benzene, Toluene, and Xylene as well as Total <br />Extractable Hydrocarbons. In addition, the two uppermost samples were analyzed at the <br />recommendation of Exceltech's site engineer. The results of these analyses are attached along with <br />copies of the chain of custody, boring logs, boring permit, and site plans showing the location of the <br />exploratory boring. <br />If you have any question, please contact our office for clarification. <br />Sincerely, <br />EXCELTECH, INC. <br />Stephen Costello <br />Staff Geologist <br />SC/CMP/da <br />enclosure <br />Nfw, pIA'J — <br />Christopher M. Palmer, E.G. 1262 <br />Manager, Geotechnical Services <br />