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I Mut Ma a Me — VEI wa 2.0 FIELD INVESTIGATION 2.1 TANK REMOVAL Removal of the underground tanks was accomplished on September 1, 1989, by Siebold Construction Co. The tanks were uncovered and blocks of dry ice were placed in the tanks to displace the air and act as fire retardant. The tanks were m- pulled using a trackhoe. A chain was passed through the fill and vent ports at one end of the tank and attached to a lifting hook on the trackhoe bucket. The tank was then dragged/lifted from:he excavation. 2.2 SOIL SAMPLING Yy A total of six (6)soil samples were taken within the fuel tank excavation(Figure 2). Two(2)samples were taken from the waste oil tank excavation and four(4)samples were taken from points along the product piping excavations(Figure 2). ._.- Samples from the tank excavations were taken from material contained in the bucket of the trackhoe. This material was excavated from a depth of about 15 feet at each of the six points indicated by the San Juaquin County Public Health Service s inspector. The samples were taken using a hand held drive sampler and brass liners. Samples from the piping excavations were obtained directly from the bottom of the excavations using the drive sampler. Once the sample was obtained the ends of the brass liner were covered with Teflon sheeting and plastic caps. The caps were secured with PVC tape. The tube was .r then labeled using a permanent marker. The label consisted of a sample number, date, time, sampler's initials and analyses to be per,,.i. e. :The sample was then sealed in a zip-loc bag and ;!Aced in a cooler containing ice for transport to the analytical laboratory . A sample of material from each soint was taken for a field head space test using an H NI U photoionization detector and a cursory soil description. These data, along -- with sample number, location, avid depth, were, recorded in the project field — ---- notebook.- Table 2-1 is a compilation of this information. . 5 _