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1. INTRODUCTION SOMA Environmental Engineering, Inc. (SOMA) has prepared this workplan on behalf of CEMEX to destroy monitoring well MW-4 at the Kerlinger Aggregate Plant located at 30350 S. Tracy Boulevard in Tracy, California (APN 235-130- 11). This Report has been prepared based on San Joaquin County - Environmental Health Department (SJCEHD)'s directive dated April 2, 2014. Figure 1 shows the site vicinity map. 1.1 Site Description The subject site is located within the boundaries of RMC Lonestar's Kerlinger Aggregate Plant at the above-stated address, east of Highway 580 at the southern edge of Tracy (Figure 1). CEMEX maintains an aggregate mining operation at the site, located in an area of industrial use and adjacent to the Tracy Municipal Airport. The facility has been in operation at this location for over 50 years and is expected to remain an active aggregate quarry in the future. Seven USTs were removed from the site between 1990 and 1999, including a 560-gallon waste-oil UST (State ID 11073004), a 1,000-gallon abandoned diesel UST (State ID 11073003), a 10,000-gallon diesel UST (State ID 11073002), a _ 7,000-gallon diesel UST (State ID 1798001), a 1,000-gallon diesel and a 1,000- gallon gasoline UST (State IDs unknown), and a 6,500-gallon asphalt UST (State ID 1798005). A map showing locations of former USTs and pertinent site features is shown in Figure 2. Investigations from 1999 to present focused on the area around the three USTs removed between 1996 and 1998 (State IDs 11073002, 1798001, and 1798005; 10,000-gallon diesel, 7,000-gallon diesel, and 6,500-gallon asphalt USTs). 1.2 Regional Geology and Hydrogeology The site is located in the Tracy Sub basin of the San Joaquin Valley of the Great Valley province, which is bounded on the west by the Coast Ranges and to the east by the Sierra Nevada Mountains (Geology of the Fresh Ground-Water Basin of the Central Valley, California, With Texture Maps and Sections, USGS _ Professional Paper 1401-C, 1986). The San Joaquin Valley is a large asymmetrical basin filled with relatively unaltered sediments and sedimentary rocks spanning the Upper Jurassic period to late Holocene. The deepest part of the basin lies near the western margin of the valley near the Coast Ranges. On the western side of the valley, older Jurassic and Cretaceous basin deposits are uplifted and deformed to form the eastern side of the northern Coast Ranges. On the eastern side of the valley, the basin deposits thin eastward and overlap crystalline rocks of the Sierra Nevada basement complex of pre-Tertiary age. The Quaternary and Upper Tertiary sediments are mostly terrestrial and were deposited as continental rocks, alluvial, and flood deposits from the San Joaquin Workplan for Decommissioning Monitoring Well MW-4 SOMA Environmental Engineering, Inc.