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2.4 Well Construction Vadose zone observation wells were planned at the site, however the desired drill depths could not be attained, therefore, no wells were constructed 2.5 Disposal of Contaminated Materials Drill cuttings (if any) from the boreholes, are currently stored in 55-gallon drums located at the site Decontamination liquids were contained in 55-gallon drums, as they were produced, and stored on-site. Stockpiled cuttings and water are currently being profiled and scheduled for disposal at appropriate facilities 3.0 Results 3.1 Site Geology During drilling activities conducted in the facility basement, approximately 4.5 feet of foundation fill material was encountered, which consisted of gravels and assorted debris (rebar, bricks, etc ) with intermittent concrete layers Native soils were encountered at approximately 4.5 feet below the basement floor. A particle size analysis, using the hydrometer method, was conducted on a native soil sample collected from borehole VW-1. Results indicated the sample was composed of 26% fines and 74% coarse grained material, which can be described as brown silty sand with gravel using the Unified Soil Classification System (USCS) Identification of soil stratigraphy underlying the abandoned tanks was not possible due to auger refusal, however, review of boring logs for wells located surrounding the site indicates that the site is underlain by unconsolidated fluvial sediments consisting of layers of lean clay and sand with varying amounts and sand and fines respectively (Figures 4 and 5). Copies of the IT Corporation boring logs for wells MW-1, MW-2, and MW-3 are included as Appendix C of this report. 3.2 Site Hydrogeology No groundwater was encountered during this investigation, however, groundwater is known to exist at the site at a depth of approximately 41 feet below grade Groundwater flow vanes from east to northeast under a shallow gradient. MZ/09-06-94/UST/940138 mer 6