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Applied Geotechnology Inc. 7.0 FINDINGS AND CONCLUSIONS Based on a review of federal, state, and local governmental agency records, the title search our on-site exploration and testing, and other pertinent data we offer the following findings and conclusions regarding the USG Interiors' Stockton, California facility: o Federal, state, and local agencies have no records of releases of hazardous substances to the environment on the site. o No off-site releases documented in the federal, state, or local agencies data bases will likely impact the site. Most sites are either hydraulically downgradient or too far away to impact the site. o Previous to 1963, the subject site was used for agricultural purposes. Development began between 1963 and 1970 when the Santa Fe Land and Improvement and later the Flangeklamp Corporation of California owned the site. The purpose of their operations on- site are unknown. o Donn Corporation purchased the facility in 1980. The facility was used to manufacture acoustical ceiling the grids. Potential contaminants used at that time included oils, grease, and mineral spirits. o Groundwater flows toward the northwest. Surface water runoff from the paved area west of the building on-site is directed toward a i north-south trending property drainage ditch. At the head of this l ditch, high levels of fuel hydrocarbon, probably diesel, have been detected. l : o Nearby commercial facilities include: Laidlaw Corporation of the West; unnamed warehouses; PDM Strocal Inc. ; LIKA Corporation; Nelson Ready Mix; Mel Bokides Petroleum Inc. ; and Commercial Cardlock Service Station. LIKA Corporation and PDM Strocal Inc. have had releases of contaminants on-site. o The LIKA Corporation metal plating facility is the closest poten- tial off-site source of contamination for the subject site. It is located about 200 feet northeast of the subject site and exists on a parallel groundwater flow path that does not appear to be upgradient or downgradient of the subject site. A report by the State Water Resource Board for the 1989 Bond Expenditures Plan for the site titled "Responsible Party-Lead Site Cleanup Work Plan, LIKA-Navy Drive" notes that the LIKA site is currently undergoing remediation efforts for metals in soil and groundwater and that the recent round of groundwater monitoring indicates lead and nickel concentrations have dropped to background levels. No other metals as contaminants are noted in the report. I-. -34-