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County of San Joaquin Public Health Services 2 <br /> April 4, 1990 (88168C) <br /> The required actions have been performed by Staal, Gardner & Dunne, <br /> Inc. (SGD): Results and comments are contained herein.. <br /> $ACKGROiTNIS <br /> A 4,000-gallon underground storage tank (UST) ;used to store diesel <br /> fuel was removed from the site on'Maras 1, 1989, by Jim Thorpe Oil Company (JTO,)... <br /> ' The UST removal: was :observed and documented by SGD in, a report entitled.: <br /> Underground Storage Tank Removal. Color Spot Lodi. Ind_ , :dated March 1989. <br /> The soils surrounding the fill port and the southwestern corner of <br /> the t)ST were visibly stained and smelled of diesel fuel. Field monitoring with <br /> A photoionization detector (FID) also indicated elevated total volatile petroleum <br /> 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 /> ;SGD conducted a soil vapor survey August 15, ;1:9:89, under San Joaquin <br /> Local Health.District (SJLHD) permit a9-1857 and documented.by SGD letter-report <br /> entitled Soft Vapor Study. Color Spot Lodi. Inc. , October 198.9:.. Res.ults: o:f the: <br /> I. ::survey indicated that the diesel fuel: contamination within :the. shallow. subsurface:. <br /> (depth Of 6 feet. 1 e4ow. ground surface: ('bgs)) slid not appear :to :have: miigrated. <br /> laterally a :sign:i.ficant distance: beyond the tank excavation. The contamination. <br /> ii appeared to he limited to the southwest corner of the excavation:.- The analytical.. <br /> 3. results of the ground water samvles collected by SGD from the .domestic .water <br /> wells ;at the site, at.: that tisae;- indicated that ground water did.. not. contailn.. <br /> hydrecairboa: :eonta�ainat:ion cove regulatory action levels. <br /> 4nJanuar}r 9, 1 9t7, SGD implemented a soils removal program :4t he <br /> site to. remove the hydrocarbon-contaminated soils. The soils removal program was <br /> :observe.d..an+d:documented.by SGD in.A, report entitled: revzronmental Services. Site <br /> ' tiemeda tion Color Sng Lo <br /> 2rtic di a 2= <br /> Cli i , dated February14 . ].9'90.. <br /> j Following. the "moval: of all soil which was thought to be contami- <br /> nated:,: six confirmatory soil mo <br /> s les were collected from the walls and base of <br /> the excavation. The laboratory analytical results of'these .samples are.presented <br /> in Table :1 Analy.ti:cal Results of Confirmatory 'Soil Samples <br />