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s !I f� .4 !I �I i 4.4 SUMMARY AND CONCLUSIONS This soil and groundwater investigation focused on the evaluation of soil and groundwater conditions in areas ' of concern noted in SECOR's Phase I Assessment at the King Island and Holiday Harbor facilities. Several areas of concern were noted during the subsurface investigation. Subject to the limitations and/or exceptions identified below,in the professional opinion of SECOR International Incorporated(SECOR), based on the knowledge and information obtained from SECOR's performance of the services provided in the Services Description which includes the investigation of selected discrete locations at the Facility,it is unlikely that the Facility contains concentrations of regulated substances,petroleum products, ' hazardous substances,hazardous wastes,hazardous materials,pesticides,toxic substances or similar substances, residues,or wastes in concentrations which would require reporting or corrective action under applicable federal, state,or local law,statute,ordinance or regulation. It is also the opinion of SECOR,based on the knowledge and information obtained by SECOR from SECOR's performance of the Services, that it is unlikely that the groundwater underlying the Facility has been affected or degraded by the migration of regulated substances, petroleum products,hazardous substances,hazardous wastes,hazardous materials,pesticides;toxic substances ' or similar substances,residues or wastes that may have been located on ar under the facility to such an extent that remedial action at the Facility would be required. F 4 ' The above representations and assurances are subject to the following exceptions: i� Based on previous investigations it appears that at least two significant fuel leaks have occurred from the ' pipelines associated with the USTs located north of the store/marina office. The first occurred as a result of a diesel fuel line break under the marina store wlvcit was discovered in 1989. The line was purged and capped,and a large quantity of soil excavated between the store and the manna offices when the leak was discovered. The diesel as well as the two gasoline pipelines were subsequently run aboveground around the north,south and east sides of the store. A second break occurr a aboveground gasoline line at the southeast corner of the store building in 1990. !r RESNA's investigation which included the installation of six monitoring wells,appeared to focus on the gasoline ' break with the thought that the previous diesel spill had been remediated. However,diesel has been found both in RESNA's monitoring wells and in soil and groundwater samples collected during 3ECOR's recent subsurface ' investigation. Diesel has not been used at the site since approximately° 1992. Since the USTs and pipeline are located in and on the levee, it appears that much of the contamination is contained within the levee. Groundwaterwithin the levee appears to be perched above finer grained silts and clays at an elevation higher than the ground surface at the eastern base of the levee. Contamination previously found in the RESNA monitoring wells was probably a result of product which leaked at the surface. Free product of both gasoline and diesel still exists within groundwater in the levee. Two additional small areas of contamination were identified during the investigation. TPHmo was discovered ' in the groundwater near the boat dock to the west of the Marina office(SB5). This contamination does not appear related to the USTs or associated pipeline. The location of the contan ination appears to beat a depth that was probably the former ground surface prior to addition of approximately fire feet of fill soil added to the levee since ' the early 1980's as a result of levee settling. Since it is near the boat dock, it may be the result of a small spill or it �i ' S0133-0u1-02 j. .. ., •