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2-1 2.0 INVESTIGATION METHODOLOGY The followmg sections of this chapter describe the methods used to complete the Phase H Investigation at the TCS, Inc facility These methods are generally consistent with the Work Plan 1 21 MOBILIZATION/DEMOBILIZATION Remcor mobilized to the Tracy, California site with a subcontracted drilling firm (Beyhk Drilling, Inc of North Highlands, Cahforrua) to complete the field tasks associated with this project on August 4, 1994 Prior to any drilling activities, local utility companies and plant personnel were notified so that they had an opportunity to locate all underground utilities The San Joaquin County Environmental Health Division was also contacted during project mobilization to provide their staff an opportunity to review the Work Plan, acquire drilling permits, and arrange oversight for the site investigation 2 2 DRILLING Drilling and sampling of soil borings and installation of monitoring wells was conducted on two separate occasions during this investigation The soil boring and monitoring well dril- ling locations were often dictated by cultural features (structures, fence, trees, underground and overhead utility Lines, etc ) present at the site All drilling locations are shown in Fig- ure 3 The following sections describe the drilling and sampling procedures used during the investigation A discussion of the soil sampling is presented in Section 2 3 and a discussion of the installation of monitoring wells is presented in Section 2 4 2 2 1 Initial Phase H Investigation Soil. Borings During the uutial Phase II Investigation, seven soil borings were advanced These borings were identified as SB-1 through SB-7 (Figure 3) Subsequent to the completion of Borings SB-1, SB-7, and SB-4, these bonngs were converted to monitoring wells that were identified as MW-1, MW-2, and 1AW-3, respectively 29025 REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS