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PARSONS 2121 N.California Blvd.,Suite 500.Walnut Creek,CA 94596.(925)941-3700.Fax(925)979-9781 •www.parsons.com November 21, 2008 Mr. Robert Aragon California EPA Department of Toxic Substances Control 700 Heinz Avenue, Suite 200 Berkeley, CA 94710-2721 SUBJECT: Draft Final Summary Report for the Oversight of Excavation Operations for the Removal of Impacted Soil Spill Prevention Control and Countermeasure (SPCC) Containment Structure at the PG&E Tracy Service Center [Formerly the Tracy Manufactured Gas Plant (MGP)] Site Tracy, California Dear Mr. Aragon, On behalf of the Pacific Gas and Electric Company (PG&E), Parsons is submitting this Summary Report for the Oversight of Excavation Operations for the Removal of Impacted Soil - Spill Prevention Control and Countermeasure (SPCC) Containment Structure at the PG&E Tracy Service Center [Formerly the Tracy Manufactured Gas Plant (MGP)] Site (hereafter referred to as the "Report") for your review. This Report was prepared to comply with the Voluntary Cleanup Agreement (VCA) Docket No. HSA-VCA 07/08-072 between PG&E and the State of California Environmental Protection Agency (Cal/EPA), Department of Toxic Substances Control (DTSC). The work at the Site was conducted in accordance with the Final Workplan for the Oversight of Excavation Operations for the Installation of a Spill Prevention Control and Countermeasure (SPCC) Containment Structure at the PG&E Tracy Service Center (Formerly the Tracy Manufactured Gas Plant (MGP) Site, Tracy, California (hereafter referred to as "Workplan) submitted to DTSC in hard copy format on October 7, 2008. The Workplan was tentatively approved via email from Ms Tami Trearse (previous DTSC Project Manager) on October 6, 2008, pending inclusion of revisions based on Ms. Trearse's comments. The revisions were incorporated in the October 7, 2008 hard copy of the document submitted to DTSC. The final approval letter for the Workplan was received from DTSC on November 5, 2008. To improve present-day environmental operations at PG&E's Tracy Service Center, PG&E's Corporate Real Estate group planned to build an improved containment structure for hazardous materials storage (SPCC Containment Structure). This Report was prepared to provide documentation of the October 20 through 28, 2008 removal of MGP-impacted soil in the area where the SPCC Containment Structure is to be installed at the PG&E Tracy Service Center (formerly the Tracy MGP Site). As a precautionary measure, PG&E contracted with a hazardous waste contractor [Phillips Services Corporation (PSC)] to remove, and segregate for sampling and characterization, potentially impacted soils that could be encountered during construction of the SPCC Containment Structure. This Report outlines the measures and