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Mr.Mike Oliphant—CEMC Soil Investigation Work Plan May 10,2013 Former Tracy Pump Station Page 2 of 3 River Oil Fields (in and near Bakersfield)to the Richmond Refinery. The pipeline and associated pump stations operated from 1903 until the early to mid 1930s. The OVP was again used during the early 1940s to primarily transmit Bunker C fuel oil from the Richmond Refinery to railroad hubs in Tracy. The pipeline northwest of Tracy may have also been used to transport crude oil to various markets in the Bay Area until the late 1960s;the OVP was reportedly abandoned in 1970. Where the pipeline was not abandoned in place, it was removed and the trenches were likely backfilled with native soil. The former OVP ROW at the Site is aligned with the south side of West Byron Road(Figure 2). The former TAOC ROW lay within the UPRR ROW. The TAOC system was constructed in 1907 and transmitted heated crude oil from the southern San Joaquin Valley to the Bay Area. The pipelines reportedly transmitted a cutter stock with the crude oil between Coalinga and the Bay Area;the cutter stock was used to reduce the viscosity of the oil. The TAOC pipelines were abandoned in the 1970s. SAIC performed several environmental investigations at the Site under the direction, and to the satisfaction, of the Central Valley RWQCB. SAIC also performed a remedial excavation at the Site in 2011. Previous environmental activities are summarized in Appendix B of SAIC's January 2012 Remedial Action Report. I SCOPE OF WORK The purpose of the investigation is to confirm the extent of a potential near-surface SPO seep previously observed at the Site, following additional geophysical evaluation at the Site. The seep was identified near a fenced area, northwest of the former pump house building. A site map is shown on Figure 2. SAIC proposes to advance up to 10 soil borings based on the results of the geophysical investigation. The exact locations of soil borings will be dependent on the results of the geophysical investigation. Soil samples will be visually evaluated for the presence of residual hydrocarbons. Soil samples will not be collected for chemical analysis. The scope of work will be implemented in accordance with the following investigation activities: • Verify access agreements for the private property on which borings are proposed. • Obtain soil boring permits from the San Joaquin County Environmental Health Department. • Mark boring locations for Underground Service Alert(USA), and notify USA at least 48 hours in advance, as required by law. • Subcontract a private utility locator to clear the site of any potential overhead and underground hazards and/or other potential obstacles. • Subcontract a California-licensed(C-57) driller to advance soil borings using a hand auger to a maximum depth of 5 feet below ground surface. 1. SAIC,2012. Remedial Action Report, Tracy Pump Station, Tracy,San Joaquin County, California. January.