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PHASE H HAZARDOUS MATERIALS ASSESSMENT WORK PLAN ACE Equipment Maintenance Facility Assessor's Parcel Numbers 167-070-08 and 177-020-25 Stockton, San Joaquin County, California 1.0 INTRODUCTION This Work Plan is for a Phase 11 Hazardous Materials Assessment for the proposed location of the Altamont Commuter Express (ACE) Equipment Maintenance Facility in Stockton, California. The proposed facility will occupy two parcels, Assessor's Parcel Numbers (APNs) 167-070-08 and 177-020- 25 (site), along the west side of the Union Pacific Railroad (UPRR) main line between Homestead Canal and Walker Slough. This section of the main line is located east of several businesses located on S. El Dorado Street between S. California Street and Walker Slough. The site is shown in Figures 1 and 2 in Appendix A. The Work Plan has been prepared at the request of the San Joaquin Regional Rail Commission (SJRRC) (client). The purpose of the site work is to investigate potential soil and groundwater contamination resulting from historical and current use of the site as an active railroad main line and siding,and from the presence of three aboveground storage tanks(ASTs) located on the northern portion of the site. All work conducted by Condor will be under the supervision of a California registered geologist or engineer. This Work Plan includes project background information; a description of the field, laboratory, and reporting procedures proposed to conduct the work; and a project schedule. 2.0 PROJECT BACKGROUND The site currently consists of railroad sidings and spurs located along the west side of the UPRR main line south of downtown Stockton. Historically, the site has been used similarly for several decades. The SJRRC is proposing to use the site for the new ACE Equipment Maintenance Facility. The proposed facility consists of an approximately 94,000 square-foot maintenance shop/office building/storage area structure, a service island, and a train wash facility. The large multi-use structure will be located no closer than 350 feet north of Walker Slough on the southern portion of the site. The service island and train wash facility will be located on the central and northern portions of the site,respectively. Given the site history, there is the potential for soil and groundwater contamination resulting from railroad use and the possibility of accidents, spills, and equipment maintenance at the site. Elevated levels of asbestos may be present in the site soils resulting from asbestos-containing train brakes. Three ASTs are located on the northern portion of the site and constitute another potential source of contamination. One approximately 500-gallon AST is indicated as containing waste. The other two ASTs appear to have several thousand gallon capacities and their contents are not indicated. All three ASTs are located within a concrete secondary containment structure. Possible groundwater contamination associated with certain properties in the site vicinity(Figure 3,Appendix A)may also impact the site. 3.0 SCOPE OF WORK The purpose of the Phase II Hazardous Materials Assessment is to investigate potential soil and groundwater contamination resulting from the use of the site as an active railroad siding and from the presence of three ASTs at the site. Ikku �.a CONDOR