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LOctber 13,2004 NOA Project Number: E04122A 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES L The potential for lead-based paint or asbestos-containing materials to be present on the property was not fully evaluated because the interiors of the residential areas were not inspected. Given the likely historical uses of agricultural chemicals on the subject property,meaningful conclusions L regarding the presence or extent of such material cannot be determined without soil sampling and analysis. j The possibility for surface contamination on the subject property from the surface debris observed Yr cannot be fully evaluated while the debris remains on the site. L No greater threat is posed to the subject property than to any other property in the neighborhood by the three open leaking underground storage tank cases. The subject property receives City water services, so contamination from these cases is not likely to present a health threat. LThe debris observed adjacent to the subject property does not appear to pose an immediate threat to / the property. However, the possibility exists that hazardous materials may be dumped at Mormon f Slough in the future. V Though there is no reason to believe that lasting contamination exists from the accidents on Highway 99, the subject property is located less than 150 feet east of the highway, and the potential for future accidents should be considered. The possibility of contamination to the subject property by the adjacent cement mixing facility could be minimized by the installation of a dividing wall or by other precautionary measures. 5.0 CONCLUSIONS AND RECOMMENDATIONS L If the property owners or EHD are concerned about the potential presence of lead-based paints or asbestos-containing materials in the older structures on the site,a survey to detect such materials should Lbe conducted. If the structures are to be demolished, all applicable laws and regulations should be followed regarding the handling and disposal of suspect material. LAll inoperable vehicles and debris on the subject property should be removed prior to site development. At that time,the site should be evaluated for any surface contamination that previously may have been ( obscured by debris. The debris removed should be disposed in accordance with all applicable laws and L regulations. L If the septic systems on the property are not to remain in use, they should be abandoned under EHD oversight. The history of the well or pump at the rear of the property should be investigated to ensure that it is not a conduit to groundwater. Any infrastructure or suspect materials discovered during site Ldevelopment should be removed and disposed in accordance with all applicable laws and regulations. L10 L