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, <br /> :.Y <br /> f . <br /> EXECUTIVE SUMMARY <br /> This report has been prepared by Pacific Environmental Group, Inc. (PACIFIC) to <br /> dac lmeat the findings of a soil and groundwater investigation performed at L``IOCAL <br /> Bulk Plant 0788 located at 8203 East 11th Street in Tracer, California. A summary of <br /> investigative find ngs is presented below: <br /> ry o A partially buried 5,000 gallon transmission fluid storage tank was <br /> rem <br /> d from the southeastern portion of the site on <br /> E December 13, 1989. Analytical results indicated that[ow levels of <br /> petroleum hydrocarbons remained in the soils adjacent to the <br /> excavation. <br /> o The San Joaquin County Public Health Services Department issued an <br /> _w "Unauthorized Storagt.Tank Release/Contamination Site Report"on <br /> January 30, 1990, and requested additional investigation. <br /> o PACIFIC installed Groundwater Monitoring Wells U-1 through U-3 <br /> on October?4 and 25, 1990. Three additional groundwater monitoring <br />- wells designated U-4 through U-6, and three exploratory soil borings, <br /> U-A through U-C,were installed an site on May 9, 1991. <br /> f o The site is underlain primarill .1 silts and clays to the maximum depth <br /> explored of 27 feet. Surficim sands were observed in the northwestern <br /> and southeastern portions of the site,at an approximate thickness of 5 <br /> to 8 feet. Significant subsurface sands were observed at approximate <br /> depths of 6 feet in U-6, 8-1/2 feet in U-B, 16-1/2 reef in U-C, and <br /> 20 feet in U-4. These Sands range from approximately 1 foot to 5 feet <br /> in thickness,but appear not to be laterally continuous across the site. <br /> o Hydrocarbon concentrations in soil samples collected during October <br /> 1990 and Olay 1991 ranged from none-detected to 1,800 parts per <br /> million(ppm)TPH-gasoline, and from none-detected to x,400 ppm <br /> TPH-diesel. Hydrocarbon concentrations were at a maximum at <br /> depths between and 3-1/2 Feet,with the maximum TPH-gasoline <br /> concentration occurring in U-1, and the maxirrs•rn TPH-diesel <br /> i <br /> 3100101/REPORT September <br />`.. - <br />