SITE INFORMATION AND CORRESPONDENCE

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Site Description and History site, around the former gasoline UST, contains The site is approximately five acres and is located in elevated levels of VOCs in the subsurface. In addition a commercial/industrial area of Tracy, California to VOCs in soil gas, there is evidence of minor (Figure 1). PG&E uses the site as a service center for impacts to groundwater in the area of the former storing and distributing material and equipment for gasoline UST.The soil gas and groundwater impacts PG&E's work crews. The site is entirely fenced and around the former gasoline UST are likely to be includes a parking lot, storage area, and a garage/ eliminated as a result of soil removal activities. office building. Human Health Risk Assessment From 1927 to 1930, a manufactured gas plant A Human Health Risk Assessment (HRA) shows operated at the site. This gas plant produced gas for that none of the chemicals present at the site pose a the lighting, cooking, and heating needs of local significant health risk to the on-site workers or residents. The plant was dismantled and removed nearby populations. However, PG&E has selected to from the property between 1930 and 1934; cleanup the site to allow for unrestricted land use, to however, some residues of the gas-making process the greatest degree possible. In order to do this, remain on site. DTSC has determined that PAHs and VOCs in the Site Investigations soil would require some form of cleanup if the site is Since the early 1980s, PG&E has conducted redeveloped at a later date for residential purposes. In investigations, monitoring, and remedial activities. order to restore the site to a condition that would be protective of all future land uses, some form of soil Since 1986, a series of environmental investigations cleanup is necessary. have been conducted at the site. Results of soil samples indicate that soil in six areas of the site Draft Removal Action Workplan contain residues from former MGP operations and/or The objective of a draft RAW is to evaluate the a release from an on-site gasoline underground nature and extent of impacts at the site and to storage tank (UST).The residues include PAHs, identify a preferred alternative which prevents or TPHs, and VOCs. Soil impacts are generally found reduces potential risks to public health and the at a depth of one to 13 feet below the ground's environment. Cleanup alternatives are evaluated surface,with the majority of impacts at a depth of based on a variety of factors including effectiveness, one to three feet. ability to be implemented, regulatory agency and Samples of soil gas (the air in between soil particles) public acceptance, and cost. indicate that one area in the northwest corner of the Before DTSC makes a final decision to approve, modify, or deny a draft RAW, it is made available for a public comment during a 30-day public comment t period.All comments are reviewed and considered °1 before the decision on the draft RAW is made. r ° Cleanup Alternatives Considered and Recommended DTSC and PG&E evaluated a variety of alternatives for cleanup of the soil and soil gas. DTSC examined four cleanup alternatives were evaluated for the site, as summarized below: t v 1. No Action-This alternative was evaluated to provide a baseline against which other cleanup alternatives can be compared. This alternative would involve no cleanup action and the site would remain in its current condition. Figure 1:Site Map