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Firestone Tire andO bber Company Page 2 Stockton, CA , Work Plan During the tank removal and soil sampling activities, a representative from the Public Health Services, San Joaquin I County, was on-site to record, inspect, and assist in the location of each soil sample retrieved for laboratory analysis . Each soil sample was taken by driving a brass tube within soils scooped into a backhoe bucket At least two to three inches of ' soils were scraped from the surface of the soils in the backhoe bucket, prior to sample retrieval After soil samples were taken, each brass tube was sealed with teflon tape, capped, ' logged, and placed on ice. The soil samples and chain-of-custody forms were then taken to a certified California laboratory for analysis . Analysis selected ' for each tank ' s soil sample (s) was in accordance with the PHS permit . Results of the analysis are summarized in Table 2 and copies of the laboratory sheets and chain-of-custody forms are ' included in Attachment A No water was noticed in the excavation during the tank removals ' Groundwater was reported by Mr Al Betterman, of the PHS to be between 55 and 60 feet below grade at the site. Additionally, groundwater flow is in a southwest direction at the site There are no known wells within the general area of the site, although, ' there may be a series of wells south of the site, along N El Dorado St (near or on Channel, weber, Main and Market Sts . ) . These wells have apparently been installed to assess hydrocarbon ' releases from other underground tanks or site operation activates The soils in the general area of the tank excavations varied from general site fill to between silty and dense clay material . The dense clay material is brown and easily visible in the tank excavations This material was encountered primarily in Tanks 8 thru 15 sites, and Tanks 6 and 16 . However, in Tank 6 , the bottom of the excavation and the soils retrieved during the soil sampling work were clays intermixed with fine sand material . ' Tank 5 excavation was a relatively homogeneous mix of silty/clay and clayey-sand. However, the soil sample at Tank 5, retrieved in assumed native sods, was characterized as clay, dry, with 1 little plasticity. The underlying soils at the site are generally a clay-type material as reported by Mr Al Betterman, of the PHS, and by 1 inspection of a generalized summary soils map located at the PHS offices The information gained through Mr Betterman and the generalized soil map confirms the soil type observed during the ' tank excavation and soil sampling work. 1 i i