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I r <br /> - QUARTERLY REPORT <br /> March 1996 <br /> Grant Line Gas & Food <br /> 2420 Grant Line Road, Tracy, California <br /> I <br /> 1.0. INTRODUCTION <br /> In accordance with a request from Mr Joe Toste, Advanced GeoEnvironmental, Inc (AGE) has' <br /> prepared this Quarterly Report for the field activities performed at 2420 Grant Line Road in Tracy, <br /> I California The installation of three wells was performed on 26 February 1996 and the sampling <br /> procedures were then conducted by a representative of AGE on 07 March 1996 The location of the <br /> site is illustrated in Figure 1 - Location Map A plan of the site is illustrated in Figure 2 - Site Plan <br /> The investigation was performed in accordance with both the San Joaquin County Public Health <br /> Services-Environmental Health Division(PHS-EHD)and the Central Valley Regional Water Quality <br /> Control Board(CVRWQCB) guidelines for investigation of underground storage tank (UST) sites <br />' 2.0. BACKGROUND <br /> 21 SITE LOCATION <br /> The site is located on the southeast corner of Grant Line Road and Toste Road in west Tracy, <br /> California (Figure 1) Interstate 205 is located approximately 1,000 feet northwest of the site The <br /> site is currently occupied by a gasoline service station and nuru-mart establishment <br /> 22 SITE ASSESSMENT <br /> It is our understanding that on 20 May 1993, soil samples were collected from beneath the former <br /> product lines at the site by Advanced Soil Technology (AST) Analysis of the soil samples indicated <br /> Ithat hydrocarbon-impacted soil was present in the area of the former product lines <br /> On 30 June 1993, three underground storage tanks (USTs) were removed from the site two 7,500- <br /> gallon unleaded gasoline tanks and one 5,000-gallon diesel tank The tank removal was performed <br /> by Walton Engineering During removal, ground water was encountered in the excavation, <br /> necessitating collection of water samples Analysis of the ground water samples indicated that ground <br /> water had been impacted <br /> On 5 January 1994, five soil borings were drilled at the site by AST Three of the borings were <br /> Icompleted as two-inch diameter ground water monitoring wells Laboratory analysis of soil samples <br /> from the borings indicated low concentrations of petroleum hydrocarbons in four of the five borings <br /> Impacted ground water was present in samples from two of the three monitoring wells <br />