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LFR Inc. ' 1.0 INTRODUCTION This report presents the results of groundwater monitoring and sampling activities ' conducted on June 1 and 23, 2006 at the Tracy Tire Fire Site located in San Joaquin County, California ("the Site"; Figure 1). LFR Inc. (LFR) has prepared this report on behalf of the California Integrated Waste Management Board (CIWMB) for submittal ' to the Regional Water Quality Control Board (RWQCB) and Department of Toxic Substances Control (DTSC). Activities were conducted in accordance with the "Work Plan for Groundwater Monitoring Well and Production Well Installation and Quarterly ' Groundwater Monitoring at the Tracy Tire Fire Site, Former Royster Tire Facility, Tracy, California," prepared by LFR and dated May 6, 2003 ("the May 2003 Work Plan"). The May 2003 Work Plan was approved by the RWQCB in a letter to the ' DTSC and CIWMB dated May 5, 2003. 1.1 Site Description ' The Site consists of approximately 50 acres of land located between the Teichert ' Aggregate and RMC Pacific Materials aggregate mining operations in Tracy, California (Figure 1). The Site is located at 29425 South MacArthur Road (Section 9, Township 3 south, Range 5 east of the Mount Diablo Base Meridian) (Ecology & Environment, Inc. [EE11 2002). The Assessor's Parcel Number (APN) for the Site is ' 253-120-26. The Site is a former gravel quarry, with associated surface topography consisting of irregular hills and gravel pits. The surrounding natural grade is ' approximately 60 feet higher than the gravel pits within the Site (Figure 2). Land within 1,000 feet of the Site is typically used for mining aggregate material such as gravel, and other surrounding land is left as unused open space. There is a gunite-lined ' irrigation ditch adjacent to the east side of the project site that transmits fluctuating volumes of water throughout the year. ' 1.2 Site History Approximately 7 million tires were illegally stored in 34 distinct piles located in gravel ' pits at the Site (EEI 2002). Waste tire materials in these piles caught fire in 1998 and burned for approximately two years, leaving behind tire waste materials. The 34 burn areas are shown on Figure 2. Materials burned in the fire included drums of used oil ' filters, abandoned vehicles, trailers, and other miscellaneous equipment and debris. The fire began at the facility on August 7, 1998, and the remaining smoldering patches were extinguished by a subcontractor under the direction and supervision of the CIWMB during December 2000. ' Final GW Mon Rpt June 2006.doc:LFR Page 1