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s AUGEAS Corporation California Natural Products Problem Assessment Report June,1991 Task 2-Installation of additional groundwater monitoring well(s) to substantiate the areal extent of contamination. Continued sampling and analysis of water from all wells, following the installation of the soil venting system,will take place on a monthly basis fora period of six months.The results of this sampling program will determine the need for groundwater remediation. Task 3 - Aeration of soil cuttings. Soil cuttings generated by the drilling activities conducted during this and subsequent investigations will be aerated onsite. Total volume to be aerated consists of only Three to five cubic yards. If groundwater concentrations of aromatic hydrocarbons are still above action levels, following the • collection of six months of analytical data, a second phase of remediation will be initiated. This second phase of remediation will consist of groundwater extraction and treatment.In addition,if its is determined during Phase I that the groundwater plume is moving and could potentially migrate off-site, Augeas Corporation will immediately initiate the second phase of remediation. Phase H Task 1 - Installation of an extraction well for the pumping and treatment of groundwater. Treatment of contaminated groundwater will be by biological means with polishing by carbon filtration. Treated groundwater will be released onsite and used for irrigation. The vapor extraction system proposed in Phase I involves the application of a vacuum to the soil to enhance the volatilization and the removal of organic compounds.The system will consist of a series of"dry wells" drilled into the vadose zone.The wells will be designed so that the screened interval penetrates the entire thickness of the contaminated soil. On the surface, the wells will be manifolded together and connected to a vacuum pump by a subsurface piping. The pump applies a vacuum to the wells, extracts the vapors and passes them through an activated carbon absorber.The activated carbon system captures the volatile hydrocarbon compounds effectively "cleaning" the vapor emissions. It is expected that the vapor extraction system will operate from six to twelve months.Verification drilling will be used to effectively evaluate subsurface conditions once a substantial decline in vapor extraction has been obtained.The spacing of wells will be based on empirical data obtained from bench studies and soil permeability data, but will initially be placed on 50-foot centers. 5