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ameO <br /> or equivalent chemical data information, for chemicals of concern will also be included in the <br /> HSP. The HSP will be distributed to all members of the field team. <br /> 3.2.2 Permitting and Site Access <br /> Prior to initiating field activities, AMEC will procure boring/well installation permits from the <br /> SJCEHD. As part of the pre-field effort, field work will be coordinated with Caltrans on-Site <br /> personnel. <br /> 3.2.3 Utility Location and Borehole Clearance <br /> r Prior to conducting field activities, AMEC will mark the proposed drilling locations and notify <br /> 1.. Underground Service Alert(USA) of planned subsurface work. In addition, AMEC will retain a <br /> private subsurface utility locating company to screen each proposed drilling location and the <br /> surrounding area for subsurface utilities. Prior to drilling, all boring locations will be cleared to <br /> five feet bgs using a hand auger or an air knife to help safeguard field workers, the public, and <br /> r infrastructure from the hazards posed by subsurface utilities. If subsurface utilities are present <br /> at a proposed sampling location, the boring will be relocated as close as possible to the initial <br /> location. <br /> 3.3 SOURCE AREA CHARACTERIZATION <br /> The rationale for the source area characterization activities and location of borings are <br /> described in the following sections. <br /> 3.3.1 Boring Location and Rationale <br /> At least four borings will be advanced with cone penetration testing (CPT) in the source area <br /> as shown in Figure 3 to characterize the extent of petroleum impacts. Membrane interface <br /> probe (MIP)technology will be used to provide vertical petroleum hydrocarbon concentration <br /> profiling data. The rationale for each proposed boring location is presented below: <br /> + CPT-1 —This boringwill be installed west of'VW-2 and within the former UST it. <br /> p <br /> Based previous soil sampling, this area is expected to have the highest petroleum <br /> hydrocarbon concentrations. <br /> • CPT-2 -This boring will be installed.southeast of VW-2 to identify the extent of <br /> petroleum hydrocarbon impacts in that direction. <br /> • CPT-3 -This boring will be installed between VW-1 and VW-2, within the former <br /> UST pit to determine the extent of petroleum hydrocarbon impacts to the-northwest. <br /> • <br /> CPT-4'-This boring will be installed near SB-1 and MW-3 to determine the extent <br /> of petroleum hydrocarbon impacts to the southwest. <br /> AMEC Geomatrix, Inc. <br /> P:\Project\14000s\14443_Caltrans\TO 10\11000_PLANSIAS WP—March 2010\AS WP.doc 6 <br />