ARCHIVED REPORTS XR0012595 - Laserfiche WebLink

Home Browse Search

c 4rp Stockton Service Station January 8,1988 Equipment Company,Inc. P.O.Box 504 Stockton,CA 94201 Attn: Mr.Mike Flores Re: Soil Sampling Beneath Gasoline Storage Tank Ruiz Grocery Store,Exceltech Project No.1619G ENVIRC?AE1TAL HEALTH FErRMIT/SERVICES Dear Mr. Flores: 3 At your request,on Monday,December 14,1987,Exceltech sent a crew to the Ruiz Grocery Store at 4491 West Durham Ferry Road near Tracey,California to drill two exploratory borings and collect soil samples from beneath an inplace subsurface gasoline storage tank. It was necessary to drf[I the borings at an angle due to obstruction directly over the tank.The work was performed under permit No.874192 issued by the San Joaquin Local Health District(SJLHD)and followed our proposal of November 16, 1987 and addendum of November 20,1987. A representative of k SJLHD,Dan Moe,was present at the site and observed a portion of the work. One boring was drifted under each end of the tank. The borings were initiated approximately 10 ` ' € feet from the center of the tank and drilled at a 45 degree angle so that the bottom of the boring r' 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 sampli.ig Interval was saved for analysis. The ends of the liner were sealed with foil and plastic caps,me ged on a chain-of-custody sheet,and placed In a chilled cooler for transport to a state-certified!aboratory for analysis. A boring log was prepared for each borehole. i Boring S13-1 was initiated at the end of the tank near the pump and boring SE-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 benzene,toulene,ethy[benzene, ., and total xylenes. These samples were eollei led from approximately 8 feet below the surface(the level of the tank bottom)and from 10 feet bea.v the surface(directly below the tank). Analysis shows that hydrocarbon contamir;ation was detected In samples Sao-3,SBZ-'2,and S82-3. The results of the analyses aiw..attached as well as copies of the boring logs,SJLHD permit,chain-of-custody,and site sketch showing the baring locations If you have any questions,pleas-call. Sincerely,-- EXCELTECH,INC. Stephen Costello Christopher M.Palmer,C.E.G.1262 Staff Geologist Manager,Geotechnical Services cc:Dan Moe(SJLHD) 41674 CHRISTY STREET • FREMONT,CA 94538 PHONE(415)659.0404 • CONTR. LIC.NO.464324 /'