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.. January 7,2004 NOA ENVIItONMENTAL PROJECT NUMBER LE03-354 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES Because methomyl was last applied to the subject property in 2000,residues of that chemical are most likely no longer present in soils on the site. Groundwater is shallow in the Tracy area, and a drain sump is used on the subject property. The potential exists that methomyl or other agricultural chemicals may be found in on-site groundwater. Because no records of leaks from the former underground storage tanks at the site are on record at the EBD, contamination from these tanks is not likely to represent a current environmental threat. The two large above-ground storage tanks on the property appear to be within sufficient secondary containment. The butane and propane tanks do not present an environmental threat. The smaller dispenser tanks observed within the equipment storage areas, however, may represent a potential threat of release. The pile of tires on the property represents a recognized environmental condition. The inoperable vehrc ees-and miscellaneous equipment may present a threat of release. Oil stains in the equipment storage areas are evidence that minor past releases have occurred. A certain amount of equipment, fuel, and chemicals are to be expected at a major farm operation. Because the property will continue to be used for its present use, general housekeeping at the site may be sufficient to satisfactorily mitigate the above issues. 5.0 CONCLUSIONS AND-RECOMMENDA TIONS' -- --~---_---_ 6. Tires, inoperable vehicles, used chemical containers, debris, and other deleterious materials should be removed from the site and disposed of according to all applicable local, state, and federal; re _... __.. _ Any demolition or renovation of buildings on the property should be performed with an awareness of potential lead-based paint and asbestos issues and according to all applicable regulations for the handling of these materials. All above-ground storage tanks on the property should be secured within secondary containment. LL7 Prudence would dictate that, if any changes take place in operation, maintenance, or zoning of the property, groundwater samples be collected from the on-site water wells and tested for a broad spectrum of agricultural chemicals. 15