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Harding Lawson Associates January 14, 1998 38737004 Ms. Mary Meays San Joaquin County Public Health Services Environmental Health Division 304 East Weber Avenue,Third Floor Stockton, California 95202 Summary of Meeting Agreements and Work Plan Addendum Proposed Supplemental Site Investigation Tri Valley Growers Plant T 26200 Noxell Road Thornton, California Site Code: 1920 Dear Ms. Meays: On January 7, 1998, a meeting was held at the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) office that was attended by yourself and Ms. Margaret Lagorio of the PHS/EHD, Mr. Chris Savage of Tri Valley Growers(TVG), and Mr. Michael Leacox and Mr. Gary D. Haeck of Harding Lawson Associates(HLA). The purpose of the meeting was to discuss issues raised in the November 19, 1997 PHS/EHD letter to TVG regarding the proposed Supplemental Site Investigation at the above referenced Site (PHS/EHD, 1997). During the meeting it was collectively agreed that the Site appears to qualify as a low-risk groundwater site and the purpose of the supplemental investigation is to collect the remaining additional site data required to submit a site closure request in accordance with the criteria outlined in Appendix B to the Tri Regional Board Staff Recommendations (RWQCB, 1996). WORK PLAN ADDITIONS AND MODIFICATIONS In response to requests in the above referenced PHS/EHD letter to TVG dated November 19, 1997, the following additions and modifications to the work plan were agreed on: The fractured casing on the top of monitoring well MW-1 will be repaired during the proposed y ( , investigation. The procedures utilized will be documented along with the results of the investigation in the Closure Report requesting No Further Action (NFA) in accordance with Appendix B (RWQCB, 1996). • The monitoring wells will be resurveyed to a common datum by licensed surveyor following installation of monitoring well MW-7. • Two hydropunch samples (at depths of first water and 20 feet below ground surface (bgs)) will be collected from each of the two 20-foot borings and three hydropunch groundwater samples will be collected from the 30-foot boring (at depths of first water, 20 feet bgs, and 30 feet bgs). • In accordance with RWQCB letter dated August 30, 1997 (RWQCB, 1997), during the proposed Supplemental Site Investigation, one soil and one groundwater sample will be analyzed for the following chemicals by EPA Method 8260 to satisfy RWQCB closure requirements: tertiary butyl alcohol (TBA) • methyl tertiary butyl ether(MTBE) Engineering and Environmental Services 10265 Rockingham Drive,Suite 150,Sacramento,CA 95827 916/364-0793 Fax:916/364-5633