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LFR Levine-Fricke 1.0 INTRODUCTION This work plan presents proposed methods and procedures to install one groundwater monitoring well, one production well, and to conduct quarterly groundwater monitoring and reporting at the Tracy Tire Fire Site located in San Joaquin County, California ("the Site"; Figure 1). This work plan was prepared by LFR Levine-Fricke (LFR) on behalf of the California Integrated Waste Management Board (CIWMB) in response to a request from the Regional Water Quality Control Board (RWQCB). 1.1 Site Description The Tracy Tire Fire 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 and Environment, Inc. 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 f is approximately 60 feet higher than the gravel pits within the Site (Figure 2). Land within 1,000 feet of the facility 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. Approximately 7 million tires were illegally stored in 34 distinct piles located in gravel pits at the Site (Figure 2; Ecology and Environment, Inc. 2002). Waste tire materials in these piles caught fire in 1998 and burned for approximately two years, leaving behind tire waste materials. Material burned in the fire included drums of 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. 1.2 Site Geology and Hydrogeology Soils encountered at the Site during previous investigations consist of silty gravel with interbedded clayey silt lenses to a depth of approximately 25 feet below the average gravel pit elevation. Silt and sand with varying amounts of gravel and clay occur at a depth of 25 to 300 feet below ground surface (bgs). The Corcoran Clay is encountered j at depths ranging from 300 to 380 feet bgs (Ecology and Environment, Inc. 2002). Groundwater occurs in two water-bearing zones at the Site: an upper water-bearing zone and a lower water-bearing zone. The upper water-bearing zone (i.e., the water table) is encountered at an approximate depth of 75 feet bgs. The lower water-bearing unit is encountered at an approximate depth of 380 feet bgs, and is separated from the Tracyyvly-same-rpt-wrkpin(final):)EE Page 1