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Mr.Mike Oliphant—CEMC Soil and Groundwater Investigation Report March 29,2013 Ahern Road—Vernalis Page 2 of 6 Area starting in the early 1900s; operations ceased in the 1930s for the OVP and in the 1960s or 1970s for the TAOC pipelines. For a brief period,the TAOC used a cutter stock with the crude oil to facilitate transport. The Site is located east of the former pipeline ROWs along Highway 33 approximately '/a mile north of the Welty Road intersection. Historical pipeline as-built maps show the former OVP and TAOC pipelines located between 75 and 150 feet west of the railroad tracks throughout most of the Site. The Site includes properties that are zoned residential and agricultural and is bounded to the south by the US Can—Welty Road site (Figure 2). SAIC and others performed many investigations at the adjacent US Can—Welty Road site (Attachment A). SAIC advanced soil borings SB-38 through SB-41 and SB-43 as part of the US Can-Welty Road investigation in November 2008 and March 2009 within a portion of the Union Pacific Railroad ROW,that now falls within the boundary of the Site6. SAIC noted affected soil and groundwater in these borings, and due to the distance from the US-Can-Welty Road site,the Ahern Road-Vernalis site was created and includes the above borings. FIELD ACITIVITIES SAIC obtained an encroachment permit through the California Department of Transportation (Caltrans), soil-boring permits from the San Joaquin County Environmental Health Department(SJCEHD), and a site access agreement for the private property located on San Joaquin County assessor parcel number(APN) 255-180-15. Underground utility notifications were requested through Underground Service Alert at least 48 hours prior to subsurface investigation work. Cruz Brothers Locators, a private utility locator, cleared the borings of potential overhead and underground hazards. All work was performed under the direction of a California Professional Geologist. Permitting, access, and safety procedures are included as Attachment B. Drilling activities were conducted in the Highway 33 ROW on February 28 and March 5, 2012, following field and sampling methods included as Attachment C. PeneCore Drilling advanced soil borings SB-1 through SB-3 to depths ranging from 55 to 85 feet below ground surface (bgs). SAIC observed indications of hydrocarbons in the soil cores from SB-1, SB-2, and SB-3 (including visual and photoionization detector [PID] readings). Indications of hydrocarbons were observed between approximately 38 and 74 feet bgs in SB-2. PeneCore Drilling was retained on September 10 and September 28, 2012, to advance step-out borings on APN 255-180-15, in the presumed down-gradient direction of SB-I through SB-3. Borings SB-4 through SB-6 were advanced to depths ranging from 40 to 45 feet bgs. There were no indications of hydrocarbons in the soil cores of these borings, however, groundwater samples collected indicated the presence of hydrocarbons in groundwater. Based on the analytical results from borings SB-4 through SB-6, PeneCore Drilling was retained on December 10, 13 and 14, 2012, to advance additional step-out borings on 6. SAIC,2009. Well Destruction and Soil and Groundwater Investigation Report, US Can-Welty Road, 35275 Welty Road, Vernalis, California. September.