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TERRA PACIFIC GROUP 13900 Alton Parkway Suite 122 Irvine CA 92618 Environmental Engineering,Consulting,and Construction (949)297494•FAX(949)297-3625 September 14, 2007 Ms.Julie Shoruidge ARCADIS BBL 2033 North Main Street,Suite 340 Walnut Creek, CA 94596 RE: Workplan Summaries —Six Central Valley Sites Dear Ms. Shortridge: This document presents site-specific workplan summaries of the proposed sampling to be conducted by Terra Pacific Group Incorporated (TPG) at the seven Pacific Gas and Electric Company (PG&E) active substation facilities located in California's Central Valley. These investigations are focused on the oil-handling buildings and mineral oil distribution systems (excluding piping) which were used historically for regular maintenance and repair of transformers at each substation. The seven substation facilities are located at the following Central Valley locations: • Stockton A Substation, 540 S. Center Street, Stockton, California • Bollota Substation, 24400 E. Flood Road,Farmington, California • Wilson Substation, 4400 E.Highway 140 (at N. Tower Rd.),Merced, California • Los Banos Substation, 16182 Jasper-Sears Rd., Santa Nella, California • Panoche Substation,West of Panoched Rd.,2 miles east of I-5,Mendota, California • Gates Substation,West Jayne Avenue, 1 mile west of Lassen Ave., Huron, California • Midway Substation,40358 Highway 58,Buttonwillow, California The scope of the sampling activities proposed at each substation was developed based on the review of facility plans provided by PG&E, site visits to each facility on September 4, 5, and 6, 2007, and, in some cases, interviews with onsite personnel. The work summarized in this document will be conducted in accordance with the Arcadis BBL'S "General Work Plan for Oil House Soil Investigations, Pacific Gas and Electric Company Substations Throughout California," dated September 1,2007. The site-specific workplan summaries for each substation facility are attached to this letter. The workplan summary for each facility includes (1) a brief summary of the site conditions and identified key oil handling features, (2) a table presenting the soil sampling program and rationale, and (3) one to three figures showing site features and sampling locations. At each facility, soil sampling is proposed in the vicinity of key existing or former oil handling features, including transformer repair/handling buildings, transformer hoists or handling structures, aboveground storage tanks (ASTs) used to store mineral oil, and immediately adjacent oil-handling underground pipelines.