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1.0 INTRODUCTION 1.1 Site Location and Description The subject property is located at 2072 W Yosemite Avenue in Manteca, California at the intersection of Yosenute Avenue and Airport Way (Figure 1) The site is on the southeast corner of the intersection in a commercial and residential area The site currently has several uses including a ung station and convenience store, automobile repair,U-Haul truck rental and propane sales There were six underground tanks(four gasoline and two diesel tanks)at the site Each is made of steel and has a 10,000 gallon capacity The age of the service station and tanks is unknown The sate is currently owned and operated by Mr Frank Guinta I1.2 Background Tank Removals, Soil Borings and Sampling by GeoAudit, Inc. A Prelirrunary Investigation and Evaluation Report was prepared by Geological Audit Services (GeoAudit), Inc of Stockton, California in February 1995 The work was performed for the Bank of Stockton The GeoAudit report stated that in September 1994 three 1,000 gallon motor oil tanks and one waste oil tank had been removed from the site(Figure 2) They reported that there had been no significant contaminants found at the time of the tank removals (Geological Audit Services,Inc., Preliminary Investigation and Evaluation Report,Franks Food Mart,2072 W.Yosemite Ave., Manteca, California, February 1995). In addition, GeoAudit drilled 10 mechanical bonngs and three hand au ered bonngs on the site The g g y collected and analyzed 21 soil samples and nine groundwater samples GeoAudit reported 18,000 ppm TPH-d, 1400 ppm TPH-g, 1 2 ppm ethylbenzene and 8 3 ppm xylenes at a depth of three feet in boring IW, hand augered boring adjacent to the diesel dispenser, east of the UST location They also reported 590 ppm TPH-g, 9 1 ppm TPH-d, 2 5 ppm benzene, 4 4 ppm toluene, 2 4 ppm ethyibenzene and 1 2 ppm xylenes at a level of 15 feet bgs in boring GB8, approximately 50 feet northwest of the dispenser islands, near Yosemite Avenue See Figure 3 for boring locations and 1 Tables 1 and 2 for further results I` Soil Borings and Sampling by Remedy, Inc. IIn April 1997, Remedy completed ten (10) soil bonngs at the site The Remedy bonngs were advanced around the fuel tanks and dispenser islands The borings were completed using Geo-Probe equipment The final depth of bonngs was approximately 16 feet Boring B-4, west of the dispenser island closest to the building, was terminated at a depth of 7 feet due to an underground concrete obstruction, believed to be associated with the previous structures on the site No samples were collected from this boring (Remedy, Inc., Initial Site Characterization Report, 2072 W. Yosemite Avenue, Manteca, California, April 23, 1997). Remedy, Inc Interim Investigation and Remediation Report September 16, 1998 Frank's One Stop, 2072 W Yosemite Avenue Manteca CA 0151IR RPT 1 '