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ARCADIS Mr.Walter Hanley December 23,2005 The background environmental information for the Site is based on a review of the Phase I Environmental Site Assessment(ESA)Report completed for the Concrete Batch Plant(B SK Associates, 2004),the Report on Former Diesel Tank Removal Soil and Pit Water Sampling completed for Nelson Ready Mix(1120GEO.L,2004), and a letter from the SJCEHD(SJCEHD, 2005; copy provided in Attachment 1). Field Investigation In accordance with A.RCADIS' Work Plan,three direct-push temporary boring were installed to evaluate the vertical and lateral extent of impacts from the UST. Prior to initiating drilling, a well permit was obtained from the SJCEHD(copy included in Attachment 2). In addition, Subdynamics,Inc.and Underground Service Alert were contacted to clear the proposed drilling locations of underground utilities prior to the initiation of field activities. As required, a site-specific HASP was prepared in accordance with the Occupational Safety and Health Administration(OSHA)"Hazardous Waste Operations and Emergency Response" guidelines(29 Code of Federal Regulations 1910.120) and the California Occupational Safety and Health Administration(Cal-OSHA)regulatory requirements.The HASP incorporated site-specific considerations including known hazards,emergency evacuation routes,emergency response procedures,and the location of the nearest hospital. Prior to initiation of field activities,the HASP was communicated to all project staff. On November 21,2005 ARCADIS advanced the three temporary borings(SB-1,.SB- 2,and SB-3) at the locations shown on"Figure 2. SBA, SB-2,and SB-3 were advanced to 20, 24,and 20 feet below ground surface(bgs),respectively. The borings were advanced using the 2-inch-diameter direct-push method and GeoprobeTM sampling equipment,which was operated by Precision Sampling Inc., a licensed C-57 drilling contractor.The GeoprobeTM sampling rig utilizes hydraulically actuated equipment to drive a hollow,cylindrical drive casing into the ground. The borings were continuously cored from the ground surface to the total depth bgs using 1.75-inch-diameter by 3-foot length acrylic sleeves. An on-site ARCADIS representative recorded the subsurface lithology of the borings in accordance with the Unified Soil Classification System(USCS)(ASTM D2487)using the continuous core.Boring logs are provided in Attachment 3. gAprojects-active\Ikq Stockton\phase iik2059 navy drive site inv.doc - 3/8 i I