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Agenda Stewart Property February9,1990 Page: 2 f 4. An extra 10,000 gallon swin_r,tank was installed and two carbon ' absorption drums were installed ready to filter the water from one lank to the next. 5. The site was cleaned and a fence.was installed surrounding the excavation. ' Additional site characterization was performed by redeveloping the three monitoring wells, i collecting ground water sample and measuring ground water gradient. The monitoring well data is attached as GT-18,MW-1 through MVV-3,and a map is attached showing,ground Ovate. gradient. ;i Geological Technics and SEMCO propose to widen the excavation about 5 feet to thQ westf-id up to 15 to 20.feet to the north to remove the remaining soil contaminated with p�etroleun% hydrocarbon. There still may be a thin layer of soil contamination above the water table that would not be cost effective to excavate. However,this is not thought to be a significant threat to ground water in the future. One major drawback is the cost for removing this extra material. it will not be inexpensive and the cost of the project as it now exists may push your current resources. The cost for the additional work is approximately for$ SEMCO, approximately $2,000 for analytical fees, and approximately $2,000 for Geological Technics' services. However, if this contaminated material could be removed at this time, it would make the ground water remediation much less expensive as the hydrocarbons may leach into the ground W-rter for years to come. As an interim remedial measure,Geological Technics proposes to pump out of MW-1 and treat the extracted water by air stripping and carbon absorption filtration. This work could be j performed cost effectively and could drastically reduce the overall cost of the ground water remediation project. The proper permits would be ebtained before this work proceeds. It is our understanding that the ground water contamination plume has not migrated very far. ' The reason for this is that approximately.6 months ago when the p!-elirninary site assessment was performed MW-I had extremely low hydrocarbon content. However, to date the levels have increased which means that the plume is migrating to the north. The main goal of this meeting is to obtain a decision from RWQCB on these proposals and get a definite direction to proceed so a budget can be established so that the work cap.proceed. This property must be put back into operation as soon as possible. It is a financial.drain and an eye sore. f 1 _i i : :i