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s QUARTERLY REPORT Geweke Land Development & Marketing 16 South Cherokee Lane Lodi, California December 1993 1.0 INTRODUCTION At the request of Mr. Mark Geweke of Geweke Land Development & Marketing (GLDM), and in accordance with Cleanup and Abatement Order No. 93-701, Geological Audit Services, Inc. (GeoAudit) has prepared this Quarterly Report of activities at 16 South Cherokee Lane in Lodi, California. 2.0 BACKGROUND 2.1 Problem Assessment Figure 1 shows the location of the site. Evidence of an unauthorized release of gasoline from underground fuel storage tanks (UST's) was encountered during the removal of three UST's from this site in 1985. Several environmental firms have been involved in the subsequent assessment of this release. The impact of this release on the vadose and saturated zones was initially investigated by J.H. Kleinfelder, Inc. (Kleinfelder) in the latter portion of 1985. Between 1986 and 1990, Brown and Caldwell Consultants (BCC)performed additional field investigations.Field work was performed by PES Environmental in 1991, and in July of that year, PES submitted a Problem Assessment Report that summarized all previous investigations and proposed remedial alternatives. The PAR became the basis for an FRP,which was submitted by GeoAudit in January 1992. The FRP focused primarily on a discussion of recommended methods for soil and groundwater remediation.No additional field work was performed, and new data on vadose- zone contamination were not generated. The Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health Division (PHS/EHD) found the FRP inadequate for several reasons, including the absence of maps and cross sections depicting vadose zone contamination. Therefore, GeoAudit submitted additional information in July 1992, but was unable to respond to all Board questions without collection of additional data. Oenbgol A da S,—,Ing. 1 13M-% DM QR 1