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0 SAIC - Engineering and Infrastructure Health and Safety Plan for Chevron EMC Field Operations FJobame: Tracy Byron Road Project- Additional Soil and Groundwater Investigation Site description: Site History The Tracy Byron road study area encompasses an approximate 7,000-foot long corridor along the south side of West Byron Road in Tracy, California. The corridor trends from northwest near the intersection of West Byron Road and Von Sosten Road, to southeast near the intersection of West Byron Road and Belconte Drive. The study area contains the former Standard Oil of California Wait-Mendota-Richmond Pipeline(OVP) right of way (ROW) and Tidewater Associated Oil Company(TAOC) pipeline ROW. The OVP pipeline ROW extends to the south side of West Byron Road and the TAOC pipeline ROW is on the north side of West Byron Road in the Union Pacific Railroad (UPRR) ROW. 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, West 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 35 feet above mean sea level and topographically is relatively flat lying. Groundwater in the upper water-bearing zone flows in a northerly direction and is hydraulically controlled by low-permeable unconsolidated sediments. Soils encountered appear to be fine- grained unconsolidated sediments, consisting mainly of silts and clays with minor amounts of poorly graded sand and gravel. The maximum concentration of chemicals of concern previously detected in soil at the site are: TPHc(7,900 mg/kg); toluene(9.2 mg/kg);ethylbenzene(1.1 mg/kg); and xylenes(9.5 mg/kg)at 8 feet bgs in SB-19. The following maximum concentrations were detected in groundwater samples: TPHd (8,900 pg/L in SB-8). Various PAHs were also detected at low concentrations. Scope of work to be performed by SAIC and subcontractors: To delineate the extent of petroleum-affected media, SAIC proposes 9 step-out soil borings to collect soil and groundwater samples. Borings will be advanced to a target depth of 35 feet 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 Geoprobe@ equipment or a temporary well casing and bailer or similar devices. SAIC will submit soil boring permit applications to San Joaquin County Public Health Services (SJCPHS). Borings on private property will require an access agreement,which CEMC will secure prior to any fieldwork. While marking boring locations, potential safety concerns and obstacles to the proposed scope of work will be observed and noted, such as overhead lines, marked and unmarked underground lines, and pedestrians and automobile traffic. Underground Service Alert(USA)will be notified of all proposed boring locations at least 48 hours prior to any field activities. All USA ticket alerts will be confirmed and cleared prior to any intrusive field activities. In addition, SAIC will subcontract Cruz Brothers Locators to clear the proposed boring locations for underground utilities. All investigation-derived waste will be placed in Department of Transportation (DOT)approved, 55-gallon drums that will be properly labeled and 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 Revision 2 - 11-2006