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`./ tial <br /> Technical Approach <br /> The technical approach to this project is to build upon the previous work. A review of the <br /> groundwater monitoring data of and other investigators indicates that residual soil contaminants <br /> and groundwater contamination is moving northerly towards the eastern edge of THS and <br /> northeast towards H.J. Heinz (Heinz). Property access permission is required to place any <br /> borings or monitoring wells off-site. Wright has secured right-of-entry agreements with THS <br /> for further investigative work and future groundwater monitoring. As of October 4, 1995, <br /> access to the Heinz property has been denied for any further investigative work discussed <br /> within this workplan. <br /> Temporary exploratory boreholes and samples using a direct push sampling technology (DPT) <br /> will be used at the locations shown on Figure 2 in an effort to define the site. An on-site state <br /> certified mobile laboratory will be used during this phase of investigative work. DPT and the <br /> use of a mobile laboratory will provide a rapid subsurface assessment which will to be used in <br /> conjunction with previously collected data. <br /> Scone of Work <br /> Exploratory Borings <br /> Up to ten exploratory borings (based upon field observations) will be drilled and at least two <br /> additional monitoring wells will be constructed at locations shown on Figure 2. Drilling and <br /> well installation permits will be secured from the PHS-EHD. Wright will prepare a site <br /> specific health and safety plan, notify Underground Service Alert, and perform a private utility <br /> location prior to the start of field work. <br /> Up to four of the exploratory borings will be placed at locations in the immediate vicinity of the <br /> former tank location to allow for a rapid reconnaissance of the soil plume configuration. This <br /> can provide data for interim remedial measures for removing suspect contaminated soil which <br /> may be a source for continuing groundwater contamination. One boring will be placed on the <br /> upgradient side of the former tank location in an effort to define possible off-site sources, <br /> lateral movement of the site plume, and to determine a possible well location. Up to four <br /> additional borings will be located off-site to further delineate the downgradient dissolved <br /> groundwater plume. Once the downgradient extent of the plume is mapped, additional <br /> groundwater monitoring wells will be installed for long term groundwater monitoring. All the <br /> collected data will assist in mapping and designing the remedial approach for the site. <br /> The boreholes will be drilled with direct push drilling and sampling equipment. All equipment <br /> and sampling tools will be cleaned prior to arriving and before leaving the site. The direct push <br /> technology is a thin wall tube about 2 inches in diameter, connected to a sampling device to <br /> collect soil. Water samples will be collected using 0.5 inch Teflon disposable bailers lowered <br /> through the center of the drilling probe rods and placed in 40ml VOA's. Soil samples may be <br /> collected at discrete intervals, or continuously as needed. The sampler will be advanced to the <br /> desired sampling depth interval, and a soil sample core collected. When soil samples are <br /> retained for laboratory chemical analysis the sampler will be equipped with clean liners. The <br /> sampler will then be retrieved and dissembled, and the soil filled brass liner will be sealed with <br /> Mr. Ed's Muffler Workplan (Cox and Cox) <br /> Page 2 <br />