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TERRA PACinc GROUP 13900 AltonPa"way Suite122,Irvine,CA92618
<br /> (949)297-0444•FAX(949)297 3625
<br /> Environmental Engineering,Consulting,and Construction
<br /> September 14,2007
<br /> Ms.Julie Shortridge
<br /> ARCADIS BBL
<br /> 2033 North Main Street,Suite 340
<br /> Walnut Creek, CA 94596
<br /> RE: Workplan Summaries —Six Central Valley Sites
<br /> Dear Ms. Shortridge:
<br /> This document presents site-specific workplan summaries of the proposed sampling to be
<br /> conducted by Terra Pacific Group Incorporated (TPG) at the seven Pacific Gas and Electric
<br /> Company (PG&E) active substation facilities located in California's Central Valley. These
<br /> investigations are focused on the oil-handling buildings and mineral oil distribution systems
<br /> (excluding piping) which were used historically for regular maintenance and repair of transformers at
<br /> each substation. The seven substation facilities are located at the following Central Valley locations:
<br /> • Stockton A Substation,540 S. Center Street, Stockton, California
<br /> • Bollota Substation, 24400 E. Flood Road,Farmington, California
<br /> • Wilson Substation, 4400 E. Highway 140 (at N. Tower Rd.),Merced, California
<br /> • Los Banos Substation, 16182 Jasper-Sears Rd.,Santa Nella, California
<br /> • Panoche Substation,West of Panoched Rd.,2 miles east of 1-5,Mendota, California
<br /> • Gates Substation,West Jayne Avenue, 1 mile west of Lassen Ave.,Huron, California
<br /> • Midway Substation,40358 Highway 58,Buttonwillow, California
<br /> The scope of the sampling activities proposed at each substation was developed based on the review
<br /> of facility plans provided by PG&E,site visits to each facility on September 4, 5, and 6, 2007,and, in
<br /> some cases, interviews with onsite personnel. The work summarized in this document will be
<br /> conducted in accordance with the Arcadis BBL'S "General Work Plan for Oil House Soil
<br /> Investigations, Pacific Gas and Electric Company Substations Throughout California," dated
<br /> September 1, 2007.
<br /> The site-specific workplan summaries for each substation facility are attached to this letter. The
<br /> workplan summary for each facility includes (1) a brief summary of the site conditions and identified
<br /> key oil handling features, (2) a table presenting the soil sampling program and rationale, and (3) one
<br /> to three figures showing site features and sampling locations.
<br /> At each facility, soil sampling is proposed in the vicinity of key existing or former oil handling
<br /> features, including transformer repair/handling buildings, transformer hoists or handling structures,
<br /> aboveground storage tanks (ASTs) used to store mineral oil, and immediately adjacent oil-handling
<br /> underground pipelines.
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