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SAIC - Engineering and Infrastructure Health and Safety Plan for Chevron EMC Field Operations Job Name: Mountain House Development Site #5 Soil and Groundwater Investigation Site Histo Site description: The site is located among agricultural areas in the community of Mountain House, California. The site is relatively flat-lying and is situated at elevations ranging from 40 to 50 feet above mean sea level. The site is located alongside Byron Road about 1,900 feet southeast of the intersection of Byron Road and Kelso Road and approximately 5 miles northwest of the City of Tracy. The study area contains the Former Old Valley Pipeline (OVP), Former Tidewater Associated Oil Company(TAOC) Pipelines, Kinder Morgan Pipeline (KML), and the Bay Area Products Line(BAPL). The right of way(ROW)for these pipelines is located south of Byron Road. Currently, the property use is agricultural. The OVP was operated as a hot-oil line from 1903 until the early to mid 1930s. The OVP lines north of Tracy were operated until the late 1960s. The TAOC pipeline system was constructed in 1907 and operated as a hot-oil line until the 1970s. The former pipelines carried heated crude oil and Bunker C fuel oil. Currently, Byron Road mainly serves residential properties and small businesses located to the north or to the south of the road. Locally, the study area is situated at an approximate elevation of 40 feet above mean sea level and topographically is relatively flat lying, sloping gradually to the northeast. Groundwater in the upper water-bearing zone flows in a northeasterly direction and was encountered at depths ranging from 11.5 to 18 feet below ground surface (bgs) during a 2005 investigation. Soils encountered at this site and other sites in the vicinity are low- permeability, unconsolidated silts and clays with minor amounts of poorly graded sand and gravel. Scope of work to be performed by SAIC and subcontractors: Advance three soil borings as temporary wells, constructed with pre-packed well screens. The temporary wells will be on private property located north of Byron Road. SAIC proposes to collect soil and groundwater samples and use results to define the extent of dissolved-petroleum constituents in groundwater and soil. Borings will be advanced to a target depth of 36 feet below ground surface (bgs). Borings will be cleared to a depth of 8 feet using a hand auger or other low impact device. Geoprobe or hollow-stem auger-type equipment will then be used to advance the borings. The borings will be continuously cored and field screened using a photo-ionization detector(PID)to detect the presence of residual petroleum in soil. All down-hole equipment will be cleaned using a Liquinox®/water solution to prevent cross-contamination. Grab groundwater samples will be collected using pre- packed well screens. SAIC will submit soil boring permit applications to San Joaquin County Environmental Health Department (SJCEHD). Borings on private property will require an access agreement, which CEMC will secure prior to any fieldwork. While marking proposed excavation locations, potential safety concerns and obstacles to the proposed scope of work will be observed and noted. These include overhead lines, marked and unmarked underground lines, pedestrians, and automobile traffic. Underground Service Alert (USA)will be notified of all proposed excavation locations at least 48 hours prior to any intrusive field activities. All USA ticket alerts will be confirmed and cleared prior to any intrusive field activities. In addition, SAIC will subcontract a private utility locator to clear the proposed excavation locations for underground utilities. All fieldwork will be conducted in accordance with SAIC's standard procedures,. All investigation-derived waste will be placed in Department of Transportation (DOT) approved, 55-gallon drums that will be properly stored pending disposal by CEMC's approved contractor, Sturgeon &Son Inc. As needed, a composite soil sample of the waste will be collected and submitted to a laboratory for waste profiling. SAIC has prepared a Journey Management Plan (JMP)to help prevent losses associated with motor vehicle- related incidents, including injuries to drivers, passengers other supplier personnel, pedestrians, and damage to motor vehicles and third-party property. 6 r r!,Asion 6 — 1-2007