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1 • i <br /> ' TERRA PACIFIC GROUP 2635 Camino Del Rio South Suite 208 San Diego California 92108 <br /> Environmental Engineering,Consulting,and Construction (619)297-1991•Fax(619)297-1211 <br /> RECO VM <br /> ED <br /> ' January 8,2008 <br /> JAN 14 2008 <br /> ' ENVIRONMENT HEALTH <br /> Atm:Frank Girardi PERMIT/SERVICES <br /> San Joaquin County <br /> ' Environmental Health Department <br /> 600 E.Main Street <br /> Stockton, California <br /> (209) 468-3449 <br /> (209) 468-3433 fax <br /> ' RE: Drill Report <br /> Permit No. 0052042 <br /> ' PG&E Stockton A Substation <br /> 540 South Center Street <br /> Stockton, California <br /> ' PGE-1035.400 <br /> ' Dear Mr. Girardi: <br /> Drilling of fifteen soil borings and subsequent soil sampling was completed during the period <br /> ' October 9, through October 10, 2007 under San Joaquin County Environmental Health Department <br /> permit No. 0052042 at the Pacific Gas and Electric Company(PG&E) Stockton A Substation (Site) <br /> located at 540 South Center Street, Stockton, California (Figure 3-1). <br /> ' The fifteen soil borings were drilled by Precision Sampling of Richmond, California using a <br /> Geoprobe direct-push drill rig equipped with 2-inch outside diameter stainless steel rods. The total <br /> depth of the soil borings ranged from 2.25 feet to 10 feet below ground surface (bgs). A revised site <br /> ' plan is attached which shows the drilled location of these soil borings (Figure 3-1). <br /> Drilling and Soil Sampling Procedures <br /> 1 The top five feet of each soil boring was hand augered to ensure utility clearance. The soil was <br /> continuously observed as it was removed from the hand auger bucket for soil lithology and evidence <br /> ' of visual contamination (stain and odor). Soil deeper then five feet bgs was continuously cored with <br /> the direct-push drill rig operated by Precision Sampling using a 5-foot long, 2-inch diameter solid <br /> core barrel sampler lined with a five-foot by 1.75-inch acetate macro core liner. Once the sampler <br /> ' was driven to the desired depth, it was brought to the surface and the acetate core liner containing <br /> the soil core was extracted from the sampler. The core section was laid out on a table and cut open <br /> lengthwise. The core was inspected for soil lithology and evidence of visual contamination. The soil <br /> ' lithology and any evidence of visual contamination observed from the surface to the boring's total <br /> depth was recorded on boring log forms,which are included as Appendix A. <br /> 1 <br />