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L LOctober 17, 2005 NOA Project Number. E05120A LIn both of the surrounding pipeline cases,the areas of crude oil contamination appear to be well defined and separated from the subject property by clean soil and ground water. Thetefore,no impact to the subject property from these cases is anticipated at this time. Because the clean-up of the diesel spill at the comer of Mountain House Parkway and Grant Line Road L and the drug lab north of the subject property were overseen by appropriate regulatory agencies, no impacts to the subject property from these incidents are anticipated. If water wells are not properly operated and maintained, they can serve as contamination conduits to groundwater. Septic systems may be used for inappropriate disposal of hazardous substances. In this case,there is no evidence to suggest that wells or septic systems may be contaminant pathways on the subject property or vicinity. 5.0 CONCLUSIONS AND RECOMMENDATIONS Given the historical use and storage of petroleum products and dairy manure on the subject property, meaningful conclusions regarding the presence or extent of target constituents cannot be determined y without soil and/or groundwater sampling and analysis. Based on the results of the Clayton Group L Services and NOA investigations,further action may or may not be warranted on the subject property. NOA agrees with the recommendation by Wallace Kuhl&Associates that all accumulated organics and redoxymorphic soils be removed from the bottoms of on-site ditches, ponds, corrals, and manure spreading areas. LIf the existing structures are to be renovated or demolished,a survey to detect lead-based paints and asbestos-containing materials should be conducted prior to any such activities. Any septic systems identified which will not remain in use should be abandoned under EHD oversight. If the septic system for which no abandonment permit was found was not properly abandoned, it should be re-abandoned under EHD oversight. Any additional infrastructure or buried debris that may be encountered during site grading or development should be removed and disposed of in accordance with all applicable regulations. Because no staining was observed in the vicinity of the transformers without a PCB-free stickers,the transformers are not considered an environmental threat to the subject property at this time. Should the property owners or the EHD be concerned about PCB contamination,PG&E should be contacted Lto either test or replace the transformers. As the site is developed,any stained soil or sources of contamination identified,such as those described in Section 3.3, should be characterized and properly disposed in accordance with federal, state, and local regulations. L 13 L "004 L