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Background <br /> 2.1 Site Location <br /> The site is located near Tracy, California in the southern portion of <br /> Section 9 and the northern portion of Section 16, Township 3 <br /> south, Range 5 east, of the Mount Diablo Meridian at Latitude 370 <br /> 41' 12"N and Longitude 1210 2521"W. The site is located at <br /> 29425 South MacArthur road about 3 miles south of Tracy, San <br /> Joaquin County, California. The site can be reached by driving <br /> south on South MacArthur Road, taking a left on Linne Road, <br /> traveling about '/4 mile,taking a left onto a dirt road, and then <br /> proceeding south for approximately J/z mile (Figure 2-1). <br /> 2.2 Site Description <br /> The Royster Tire Facility is located in an old gravel pit. The <br /> facility is situated below grade. It has been estimated that from <br /> two to seven million tires were stored at the facility. The facility <br /> stored tires in large disorganized piles, in more orderly piles, and in <br /> piles of bundled tires. The facility also stored drums of <br /> automobile, truck and equipment oil filters, old vehicles, trailers, <br /> and other miscellaneous equipment and debris. <br /> The site lies totally within an old gravel pit. The START has <br /> researched local geological features. A mining engineer employed <br /> by Teichert Gravel Company was interviewed. The Teichert site <br /> is located immediately to the east of the site. He reported that <br /> gravel operations become uneconomical when a very large clay <br /> layer is reached and are then discontinued. It is currently assumed <br /> by START that the tire fire site is underlain by a large clay layer. <br /> This would minimize the downward migration of contaminants. <br /> As the site is a large pit there is no path for the off site migration of <br /> surface waters. <br /> There has been no previous soil characterization inside the gravel <br /> pit since the tire fire. Three groundwater wells surrounding the site <br /> were sampled during an August 14, 1998 sampling event by <br /> START. The results from this sampling event will be used as <br /> background for groundwater. One of the three wells is at a <br /> residential property and is used for drinking, therefore EPA <br /> drinking water methods were used for analysis of the samples. <br /> 09:C:\MyFiles\PROJEMTncy_Tire\QASP\QASP_0339.wpd-11/30/98 2-1 <br />