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' 129 East Center Street October 14, 1993 <br /> Manteca, California Page: 2 <br /> Phase H Underground Tank Investigation <br /> ' 3.0 Site Work Plan <br /> This site investigation will involve one soil boring, to groundwater, drilled through the <br /> former tank excavation (Figure 2). Soil sampling will begin at a depth five feet below the <br /> surface and laboratory soil samples will be taken at five foot intervals including the <br /> capillary fringe. A minimum of three soil samples from the boring will be selected for <br /> ' analysis by the registered professional based on odor, discoloration, and PID readings. <br /> The laboratory analytical results will help determine if petroleum contaminants are present <br /> and/or the vertical limits if contamination is encountered. The other samples will be held <br /> by the laboratory pending the results of the first samples. <br /> An additional boring may be conducted in the area of the former tank if field observations <br /> ' during the initial boring warrant it. <br /> ' 3.1 Drilling <br /> Permits will be obtained as necessary for all wells (including borings) before <br /> ' drilling begins. The soil boring will be accomplished using a mobile mounted <br /> drilling rig employing the use of a hollow stem flight auger no less than 3" inch i.d. <br /> and 8" O.d. <br /> ' All drilling equipment will be thoroughly steam-cleaned before drilling begins, to <br /> prevent the introduction of contamination from off site, and steam cleaned between <br /> ' borings to prevent cross contamination. <br /> ' The borings will be logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Figure 3). The color, texture, <br /> moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil <br /> ' or bedrock characteristics, and any evidence of contamination will be noted. All <br /> water-bearing zones and the depths at which they were encountered will be noted <br /> on these logs. <br /> ' All borings will be drilled in such a manner as to prevent cross contamination <br /> between strata. Exploratory soil borings within the unsaturated zone will be <br /> ' backfilled with a concrete slurry mixture. <br /> The cuttings from the drilling operation will be containerized on-site during drilling <br /> ' for proper disposition. The proper method of disposal will be dependent upon <br /> results of laboratory analysis. This disposal will be the responsibility of the client <br /> unless other arrangements have been made. <br /> 1 <br />