ARCHIVED REPORTS XR0005957 - Laserfiche WebLink

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1.0 INT'RODUCT'ION Kwikee Foods is a convenience store and former gasoline filling station located on Country Club Boulevard in Stockton, California. In 1994, Upgradient Environmental Consultants began an investigation of the extent of soil and groundwater contamination beneath the property at the request of the owner, Mr. William Peters. The investigation has now completed and the purpose of this report is to summarize the results of the investigation and consider remediation alternatives. The investigation has been supervised by the Local Oversight Program of San Joaquin County Department of Health Services, Environmental Health Division(PHS/EHD). 2.4 BACKGROUND INFORMATION The project site is located at 2081 Country Club.Boulevard in west-central Stockton. The location of the site is shown in Figure 1, and the site facilities are shown in Figure 2. The site is located in a residential/commercial area, and the local topography is flat. A Chevron gasoline station was formerly located west of the site, but has been demolished and is presently undergoing soil and groundwater remediation caused by an unauthorized release of petroleum hydrocarbons. Numerous vapor extraction and air-sparging wells have been drilled at that site, along with more than a dozen groundwater monitoring wells, some of which are located in Franklin Street near the Kwikee Foods property boundary (labeled MW-b, etc. in Figure 2). A third UST site is under investigation on the west side of the former Chevron site, and free-phase gasoline has been reported in monitoring wells at that site. In addition, the property located directly south of the Chevron site on the south side of Country Club Avenue has a service-station type of canopy in the front and it may have been a filling station at one time, but this site has not been investigated. For reasons that are no longer clear,Geological Technics installed a groundwater monitoring well at Kwikee Foods in early 1990, and collected a water sample in April 1990. No soil samples from this well were analyzed(labeled KF-3 in Figure 2), but Total Petroleum Hydrocarbons in the gasoline range (TPH-g)were detected at a concentration of 81,600 µg/1 [parts'per billion(ppb)] in the water sample. Benzene, toluene, ethylbenzene, and xylene (BTEX) were detected at concentrations of 2,107, 2,029, 1,388, and 4,398 ppb in the same sample. Although further investigation was indicated,no further work was undertaken due to financial and other reasons. Under the threat of legal action by PHS/EHD, however, Mr. Peters contacted three local environmental firms in mid-1994 to prepare a cost estimate and work plan for site investigation. Mr. Peters subsequently retained Upgradient Environmental, and we submitted the,requested work' plan to PHS/EHD on December 1, 1994. 1