SITE INFORMATION AND CORRESPONDENCE 1995-2004

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James L. Tjosvold, P.E. June 6, 1996 Page 3 3. Range of points of compliance for groundwater. • Groundwater beneath the site. • Groundwater at the perimeter of PG&E property. Proposed Feasibility Study Approach The following approach is planned in the feasibility study for evaluating alternatives with respect to the range of goals and points of compliance outlined above. 1. Identification and screening of technologies - General response actions will be developed followed by an initial screening and a secondary screening. During the secondary screening, the technologies will be evaluated against three criteria which will be weighted equally: effectiveness, implementability, and cost. The effectiveness criteria will consist of the following: 1) the ARARs identified for this site, 2) the soil goals, the range of groundwater goals and the points of compliance outlined above, 3) and the potential for the technology to handle the estimated volume of material, control mobility or toxicity of COPCs, reduce long-term exposure and minimize short-term impacts. 2. Development and screening of remedial action alternatives - A range of alternatives will be developed from the technologies identified in the secondary screening. These alternatives will then be screened down to a reasonable number for detailed evaluation. The basis for this screening will consist of effectiveness, implementability, and cost where effectiveness is defined as above. 3. Detailed evaluation of selected alternatives -The above screened down alternatives are evaluated against nine federal criteria which include long-term effectiveness; reduction of toxicity, mobility, or volume of COPCs; short-term effectiveness; compliance with ARARs; implementability; overall protection of human health and the environment; cost; acceptance by supporting agencies; and acceptance by community. A recommendation is made based on this detailed evaluation.