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4� � . w -WINa ROOM a "ter .JON - - A- .' "• fi P i EXCELYECW Stockton Service Station January 8, 1988 Equipment Company,Inc. P.O.Box 500 Stockton,CA 94201 Alin: Mr.Mike Flores Re: Soil Sampling Beneath Gasoline Storage Tank Ruiz Grocery Store. Exceltech Project No.1619G Dear Mr. Flores: At your request,on Monday,December 14,1987,Excellech sent a crew to the Ruiz Grocery Store at 4491 West Durham Ferry Road near Tracey,California to drill two exploratory borings and collect sof]samples from beneath an inpface subsurface gasoline storage tank. It was necessary to drill the borings at an angle due to obstruction directly over the tank.The work was performed under permit No.87-4192 Issued by the San Joaquin Local Heallh District(SJLHD)and followed our proposal of November 16,1987 and addendum of November 20,1987. A representative of SJLHD,ban Moe,was present at the site and observed a periion of the work, One boring was drilled under each end of the tank. The borings ware initiated approximately 10 feet from the center of the tank and drilled at a 45-degree angle so that the bottom of the boring was directly under the tank at approximately 10 feet in depth. Samples were collected at 5-foot intervals along the borehole using a California-type sampler equipped with brass liners. One liner from each sampling interval was saved for analysis. The ends of the finer were sealed with foil and plastic caps,logged on a chain-of-custody sheet,and placed in a chilled cooler for transpo,r to a state-certiffed laboratory for analysis. A boring log was prepared for each borehole. Boring SB-1 was initiated at the end of the tank near the pump and boring S13-2 was Initiated at the opposite end of the tank. The two lowermost samples from each borehole were analyzed for total hydrocarbons as gasoline with a distinction of the compounds benzer,Fr,toulene,ethyibenzene, and total xylenes. These samples were collected from approximately 8 feet below the surface(the level of the tank bottom)and from 10 feet below the surface(directly below the tank). Analysis shows that hydrocarbon contamination was detected in samples S131-3,SE2-2,and S132-3. The results of the analyses are attached as well as copies of the boring lo�s,SJLHD ' permit,chain-of-custody,and site sketch showing the boring locations. If you have any questions,please call. Sincerely, EXCELTECH,INC. Stephen Costello Christopher M.Palmer,C.E.G.1262 Staff Geologist Manager,Geotechnical Services G cc:Dan Moe(SJLHD) 41674 CHRISTY STREET FREMONT, CA 94538 PHONE(415)659-0404.• CONTR. LEC. NO. 464324