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LFR Inc. 1.0 INTRODUCTION This work plan was prepared by LFR Inc. (LFR) on behalf of the California Integrated Waste Management Board (CIWMB) and presents proposed methods and procedures to install, develop, and sample one groundwater monitoring to be located approximately 150 feet north of the Tracy Tire Fire Site, located in San Joaquin County, California ("the Site"; Figures 1 and 2). Installation of the well is proposed to further evaluate groundwater quality downgradient from well MW-6 and soil borings SB-01 and SB-02, as described in Section 1.1. 1.1 Background and Objective The objective of this work plan is to install a groundwater monitoring well (MW-8) at a location downgradient from well MW-6 and soil borings SB-01 and SB-02 (Figure 2). Total petroleum hydrocarbons as diesel-range hydrocarbons (TPHd; carbon range CIO to C24) were detected in the groundwater samples collected from well MW-6 (330 micrograms per liter [µg/11) and soil borings SB-01 (5,100 µg/1) and SB-02 (51,000 µg/1) during November 2005 (summary to be submitted under separate cover). Monitoring well MW-8 will be used to monitor groundwater quality downgradient from these detected concentrations of TPHd. 1.2 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 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 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 eastern 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 fire materials in these piles caught fire on August 7, 1998, and were finally extinguished by a subcontractor under the direction and supervision of the CIWMB during December 2000. Material burned in the fire also included thousands of used oil filters, abandoned vehicles, trailers, and other miscellaneous equipment and debris. wp-MW-08 Install-FebO6-final-M2506.dx:LFR Page 1