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ry Y ' l; PROPOSED MEETING AGENDA Former STOCKTON PLATING Facility 632 South El Dorado Street Stockton, California Location: San Joaquin County Public Health Services - Environmental Health Services Date: 29 January 1998 Attending: Mr. Harlin Knoll and Ms. Margaret Lagorio - PHS-EHD Mr. William Little, Mr. Robert Marty, Mr. Nuel Henderson - Advanced GeoEnvironmental, Inc. I4 Proposed Discussion: f 1.'; With ground water well above the slotted intervals of ground water monitoring wells MW-1 through MW-3, these wells may not have been adequate to characterize the dissolved-phase hydrocarbon plume. 2. Detectable concentrations of hydrocarbons were present in both down gradient wells MW-4 and MW-5. The concentration of TPH-g and benzene in MW-5 appears to be declining slightly over the last four monitoring quarters, while the concentrations in MW-4 appear to be fluctuating between low concentrations and undetectable concentrations, suggesting that the well is at the margin of the dissolved hydrocarbon plunge. 3. The dissolved hydrocarbon plume margins are not well delineated north, west and southwest of VW-4 or south of VW-1. The estimated dissolved hydrocarbon plume is depicted in Figure 4. 4:- USTCF cost pre-approval of the soil vapor extraction and in-situ air sparging wells and system installation and operation has been granted. l - AGE recommends the following: • Collection of three grab water samples at the site to determine the western, southern and southwestern lateral extent of the dissolved plume (see Figure 4). Install an additional ground water monitoring well approximately 30 feet southeast of VW-1 or near the southern edge of the dissolved plume, as determined by the analysis of grab water samples (see Figure 4). Installation of soil vapor extraction and/or in-situ air sparging wells needed for preparation for active remediation at the site.;- Initiation ite.Initiation of the active in-situ remediation at the site, f i II --