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Stantec Consulting Corporation <br /> 3017 Kilgore Road Suite 100 <br /> Rancho Cordova CA 95670 <br /> Tel:(916)861-0400 <br /> Fax:(916)861-0430 <br /> sufftc <br /> February 9, 2010 <br /> File: 185702120.200.0002 <br /> Ms. Kristi Shelton <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova,California 94670-6114 <br /> Reference: Work Plan for Additional Site Characterization <br /> PG&E General Construction Yard <br /> 401 E. French Camp Road <br /> French Camp, California <br /> Case No. 1TMC120 . <br /> Dear Ms. Shelton: <br /> On behalf of Pacific Gas and Electric Company (PG&E), Stantec Consulting Corporation (Stantec) <br /> is submitting this Work Plan for Additional Site Characterization (Work Plan) to the Central Valley <br /> Regional Water Quality Control Board (RWQCB) for the PG&E General Construction Yard located <br /> at 401 E. French Camp Road (the site, see Figure 1). This Work Plan was prepared in response to <br /> the RWQCB letter dated December 16, 2009, requesting additional subsurface investigation to <br /> further define the vertical extent of petroleum hydrocarbon-impacted soils in the vadose zone at the <br /> site. In addition, the RWQCB requested modeling of the proposed soil concentrations remaining in <br /> the soil following excavation to determine if TPH will migrate to groundwater. <br /> The proposed scope of work consists of the following actions: <br /> • Advancement of three direct-push soil borings to ;provide vertical delineation of impacted <br /> soils; <br /> Application of the analytical model VLEACH to determine the potential for possible migration <br /> to groundwater, and <br /> • Preparation of a summary report documenting the results of the additional investigation and the <br /> VLEACH modeling. <br /> I:\PG&E\French Camp\2010 Remediation\Work Plans\PGE French Camp_2010 WP_fnl.doc ` <br />