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SECTIONTHREE Scope of work 3.1 INVESTIGATION ACTIVITIES This investigation will include the installation of soil gas probes at four locations along the rail spur located on the western side of the facility. 3.1.1 Soil Gas Survey Prior to beginning the soil gas investigation, a utility clearance will be conducted at each location. The utility clearance will include clearance of public property by Underground Services Alert (USA), and clearance of private property using a private utility company. USA will be contacted a minimum of 48 hours prior to commencement of field activities. URS will obtain all of the necessary drilling permits from the San Joaquin County Environmental Health Department (SJCEHD) prior to beginning field activities. There are two rail spurs located along the western side of the facility. Two soil gas probes will be driven at two locations along each rail spur (Figure 3-1). Two of the samples (one on each spur) will have samples collected from 5, 10, 15, 30, 45, and 70 feet bgs. The two other probes (one on each spur) will have soil gas samples collected from 5, 10, and 15 feet bgs. Sol] gas samples will be collected by using a CPT rig to advance rods to the desired sampling depths. The rods are equipped with a dual-threaded fitting that allows the probe to be driven to the sampling depth; the probe is then unscrewed and retracted slightly to allow soil gas to enter the sampling tube. Poly tubing is attached to the probe, and runs to the gas collection equipment in the CPT rig. One-liter Tedlar bag samples will be collected for off-site laboratory analyses and field screening using an organic vapor meter (OVM). All of the soil gas samples collected from 5, 10, and 70 feet bgs will be analyzed for VOCs by the off-site laboratory. The soil gas samples from 15, 30, and 45 feet bgs will be field screened with the OVM. If elevated concentrations (above background) of VOCs are detected with the OVM, a soil gas sample from that depth will be submitted to the laboratory for analysis. Tedlar bag samples will be collected using an evacuated chamber (i.e., lung) sampling apparatus. The lung is a sealed chamber with an attached pump, sampling port, and release valve. A bag is placed inside the lung and attached to the sampling port. The lung is closed and the pump is used to create a vacuum chamber. The vacuum causes the bag (attached to the sample port) to inflate. The release valve is used to release the vacuum so that the bag can be removed from the lung. UMVADow\CeloteASoil Gas WPISaI Gas WP.doc 3-1