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0 0 Soil Sampling Work Plan anteagroup Stockton, CA -SJRRC Property Exchange 1.0 INTRODUCTION AnteaTmGroup has prepared this Soil Sampling Work Plan to outline a proposed scope of work to evaluate potential concerns for future railway workers on the property involved in a potential property exchange between Union Pacific Railroad (UPRR) and the San Joaquin Regional Rail Commission (SJRRC), near the intersection of Alpine Avenue and West Lane in Stockton, CA (Figure 1). Provided herein is a site summary, and a proposed scope of work. 1.1 Site Description The area of potential property transfer from the SJRRC to UPRR would include the 100 foot by approximately 1600 foot rectangular area west of the tracks, included in parcel number 117-09-014 (Figure 2). Buildings on the lot have been razed,and the property is currently a vacant,dirt lot. The site is relatively flat,and lies at approximately 20 feet above mean sea level. Surrounding land use is mixed, consisting of commercial, industrial, protected agricultural(cemeteries)and residential areas. 1.2 Background The site's case extends to a larger 62 acre area including parcel numbers 117-090-01, 117-090-13 (OU 1) and 117- 090-14, 125-360-04, 127-280-34 (OU-2). A review of parcel maps and historic documents suggest that parcel 127-80-034 was incorporated into parcel 127-21-215. The proposed property transfer area is included in OU-2, which lies within parcel 117-090-114(Figure 2). The collective site (OU-1 and OU-2) was used for wood products manufacturing by several companies (Stockton Box Company, American Forest Products Company (AFPC), and American Moulding and Millwork Company (AMMO)) from 1921 to 1993. During this time, petroleum products and solvents were used and stored onsite, and burn pits were used to dispose of some waste products. Numerous environmental investigations and remedial efforts have taken place across the site, and are summarized in AMEC Geomatrix Inc.'s (AMEC) October 6, 2009 report. MCD-Lazares, LLC (MCD) acquired the site out of bankruptcy in 2006, and committed to complete the required provisions of the Voluntary Cleanup Agreement for assessment and cleanup of structures and soil at the site. Concurrently, AFPC and the URS Corporation (URS) conducted groundwater remediation associated with former underground storage tanks at the site. MCD sold the collective site to the SJRRC in 2008(AM EC 2009). A Human Health Risk Assessment (HHRA) prepared for the collective site was approved on December 17, 2007, and the addendum was approved on October 22, 2008. The HHRA established a risk based remediation goal (RBRG) for 2,3,7,8-tetrachlorodibenzo-p-dioxin (2,3,7,8-TCDD TEQ) of 0.220 µg/kg for a 1.0X10-5 cancer risk (DTSC 2008). 1 www.anteagroup.com