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r- <br /> tantec Consulting Corporation <br /> /+ 017 Kilgore Road, Suite 100 <br /> 1 Rancho Cordova CA 95670-60-6 <br /> 150 <br /> Tel: (916)861-0400 <br /> Fax: (916)861-0430 <br /> Stantec <br /> April 24, 2009 <br /> Ms. Knsti Shelton <br /> Central Valley Regional Water Quality.Control Board. <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 94670-6114 <br /> Reference: Remedial Excavation Work Plan <br /> PG&E Former General Construction Yard <br /> 401 East French Camp Road,French Camp, California <br /> Dear Ms. Shelton: <br /> Stantec Consulting Corporation (Stantec),on behalf of Pacific Gas and Electric Company(PG&E), has <br /> prepared this Remedial Excavation Work Plan(Work Plan)for the former PG&E General Construction Yard <br /> located at 401 E. French Camp Road in French Camp, California (the site, see Figure 1). The scope of work <br /> described herein is based on recent correspondence from the Central Valley Regional Water Quality Control <br /> Board (the Board), specifically the Board's letter dated December 30, 2008_and addressed to Ms. Anne <br /> Conner of PG&E. <br /> The proposed scope of work consists of the following actions: , <br /> ❑ Abandonment of three groundwater monitoring wells and one domestic well; <br /> ❑ Advancement of up to six direct-push soil borings to confirm the proposed limits of excavation, and to <br /> collect soil chemical data used to profile the soil for disposal; <br /> Removal, transport, and disposal of up to 146 tons of impacted soils. Following collection of post- <br /> excavation soil samples to ensure that cleanup goals have been met, the excavation will be backfilled <br /> and the upper two feet compacted to 90% relative compaction; and <br /> ❑ Submittal of an implementation report and related closure documentation to the Board. <br /> BACKGROUND <br /> Previous work at the site has identified and delineated fuel hydrocarbons in soil and groundwater originating <br /> from historical aboveground storage tanks. In 2007, Stantec(formerly SECOR) excavated approximately 40 <br /> cubic yards of impacted soils, and observed additional chemical impacts to a depth of at least 8 feet below <br /> ground surface(bgs). Subsequent investigation identified impacted soils to approximately 20 feet bgs, and- <br /> minor impact to shallow groundwater. Groundwater monitoring wells,vve`re installed and sampled in May 2007, <br /> and sampled for four consecutive quarters between November 2007 and August 2008."Minor concentrations <br /> of gasoline-and diesel-range fuel hydrocarbons were reported in source-area well MW-1 during the initial <br /> sampling event. Gasoline was not detected during subsequent events, and concentrations of diesel in MW-1 <br /> i <br /> I <br />