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i6a Onsite and Offsite Assessment Report 1 `Zr The Southland Corporation,2725 Country Club Boulevard,Stockton California November 30,1998 1.0 INTRODUCTION This report is submitted by Fluor Daniel GTI, Inc. (Fluor Daniel GTI)to summarize the results of initial site assessment at Southland Store No. 14117 and adjacent property owned by Patmon Company, Inc. (Patmon Company). Southland Store No. 14117 (Southland 14117)is located at 2725 Country Club Boulevard, and the Patmon Company property(Patmon Property) is located at 2733 Country Club Boulevard (Figures 1 and 2). The scope of work included drilling and sampling 17 soil borings(6 of which were located on the Patmon Property), laboratory analysis of selected soil samples and one groundwater sample from each boring, and preparation of this report. The work was conducted to meet the requirements of the San Joaquin County Department of Public Health Services (SJCPHS), Environmental Health Division for initial site assessment, and to address real-estate transaction issues relating to the Patmon Property. The work described in this report was completed from September 29 through October 2, 1998,in accordance with the scope of work outlined in Fluor Daniel GTI's Underground Storage Tank Removal Report and Workplan for Farther Site Investigation,dated September 25, 1998. 1.1 Background Southland 14117 is bounded to the north and west by the Patmon Property(residential condominiums), +� to the east by a USA(former Exxon) Service Station, and to the south by Country Club Boulevard. There are reported dry cleaning facilities in the general site area. The following section outlines the previous environmental history of the Southland facility. It is noted that the USA/Exxon facility has reportedly experienced a release of hydrocarbons, but detailed �. information regarding the status of investigation and/or remediation at the USA/Exxon site is not available at this time for inclusion in this report. Future reports on the Southland site may include relevant information on the USA/Exxon site as further information is obtained from SJCPHS files. On July 17, 1998,three 10,000-gallon single-wall underground storage tanks (USTs)were removed from Southland 14117,and were replaced by new USTs (Figure 2). The new tanks were installed in a +•• newly-excavated tank pit, located east of the old tank pit near the eastern site property line. The USA/Exxon site is located just east of the new tank pit area. During Southland's tank removal,six soil samples were collected from the floor of the UST excavation beneath each end of the three USTs at a depth of 13.5 feet to 14.5 feet BGS. One groundwater grab sample was also collected from beneath each of the USTs. All soil and groundwater sampling was conducted at the direction and observation of Mr.Michael Kith of the SJCPHS. All samples were submitted to a California state-certified laboratory for analysis under legal chain-of-custody. tat 17saupt FLUOR DANIEL GTI C,?