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_ 14 <br /> �G <br /> ! County of San Joaquin Public Health Services 2 <br /> April 4, 1990 (88168C) <br /> i <br /> ^1 <br /> The required actions have been performed by Staal, Gtirdner & Dunne, <br /> Inc. (SGD). Results and comments are contained herein. <br /> 5 BACKGROUND <br /> A 4,000-gallon underground storage tank (UST) used to store diesel <br /> fuel was removed from the site on March 1, 1989, by Jim Thorpe Oil Company (JTO). <br /> The UST removal was observed and documented by SGD in a report entitled: <br /> E <br /> Underground Stora Tanks Removal Color Spot Lodi, Inc. , dated March 1989. <br /> _ ( i <br /> The soils surrounding the fill port and the southwestern corner of <br /> the UST were visibly stained and smelled of diesel fuel. Field monitoring with <br /> a photoionization detector (PID) also indicated elevated total volatile petroleum <br /> E i hydrocarbon (TPH) concentrations. Soil samples collected after the UST was <br /> removed exhibited ethylbenzene, total xylenes, and TPH concentrations in excess <br /> of applicable regulatory action levels. As a result of the soil contamination, <br /> SGD was hired by Color Spot,. Inc., to verify the.existence of soil contamination, <br /> -- delineate the lateral extent of contamination, and to evaluate adjacent domestic <br /> ground water wells for contaminants associated with diesel fuel. <br /> E . <br /> SGD conducted a soil vapor survey August 1.5, 1989, under San Joaquin I <br /> r ti� Local Health District (SJLHD) permit 89-1857 and documented by SGD letter-report <br /> entitled: Soil Vapor Study. Color Snot Lodi. Inc , October 1989. Results of the <br /> survey indicated that the diesel fuel contamination within the shallow subsurface <br /> (depth of 6 feet below ground surface [bgs]) did not appear to have migrated <br /> laterally a significant distance beyond the tank excavation. The contamination } <br /> j appeared to be limited to the southwest corner of the excavation. The analytical <br /> results of the ground water samples collected by SGD from the domestic water <br /> wells at the site, at that time, indicated that ground water did n,:t contain <br /> hydrocarbon contamination above regulatory action levels.. ;.. <br /> i On January 9, 1990, SGA implemented a soils removal program at the i <br /> L site to remove the hydrocarbon-contaminated soils. The soils removal program was i <br /> r} observed and documented by SGD in a report entitled: Environmental Sg�v_j�e <br /> Remedigtio),. Color pot. Inc, . Jodi. California, dated February14, 1990. <br /> � <br /> Following the removal of all soil which was thought to be contami- <br /> nated, six confirmatory soil samples were collected from the walls and base of ; <br /> �f4t4- the excavation. The laboratory analytical results of these samples are presented <br /> r in Table 1 - Analytical Results of Confirmatory Soil Samples. <br /> A <br />