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T MNSM 5.2 Phase loll - Carbon Adsorption System The Thermal Oxidizer was removed on July 13, 1992 and replaced with the Granulated Activated Carbon (GAC) treatment system The Phase II Carbon Adsorption System consists of one 5 horsepower regenerative blower and two 2000 pound granulated activated carbon vessel arranged for series operation The carbon vessels are utilized as the off-gas treatment technology to remove the residual hydrocarbon vapors from the vapor extraction wells Weekly monitoring has been conducted to document system performance During this ' monitoring, weekly influent and monthly effluent air samples have been collected Routine maintenance of the Carbon Adsorption System has been also conducted during this time ' Laboratory analyses from the Carbon Adsorption System will be submitted upon receipt Due to the limited timeframe associated with the sale and development of the site, RESNA Industries feels that soil closure sampling is warranted at this time Information gathered dunng closure sampling will be utilized as a basis to request for immediate regulatory closure for the soil 6.0 PROPOSED CLOSURE BORINGS RESNA Industries, on behalf of C M Weber Enterprises, Inc proposes to complete the following worksteps to provide data on current subsurface conditions This information will provide the basis for negotiations for obtaining closure of the vadose zone portion of the protect ' To document current hydrocarbon concentrations within the vadose zone, RESNA Industries proposes to drill, log, and sample 9 soil borings Proposed soil boring locations are shown in ' Figure 6 Boring locations, when possible, will be located near previously dnlled borings that contained known hydrocarbon concentrations All soil borings will be advanced to a total depth ' of 32 feet below grade Drilling will be conducted by a licensed drilling contractor using a hollow-stem auger drill rig R070792 TLP 7