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` October 31,2005 NOA Project Number: E05132A �. 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. �. Because the adjacent underground storage tank was removed without a permit,the possibility exists that contamination may remain in the vicinity of that tank. �. Because of the distance from the two identified drug labs and one identified Local Oversight Program case to the subject property,no impact to the property from those sources is anticipated at this time. The five additional hazardous materials incidents are not anticipated to impact the subject property v. because in each case the incident was cleaned up by an appropriate agency or contractor. Based on the location of the Marley Cooling Tower Company to the north of the subject property,the detection of hexavalent chromium in groundwater to the south of the subject property may indicate that the groundwater beneath the subject property is contaminated with that constituent. r Due to the location of the above-ground storage tank and the content of the debris pile on the adjacent property to the east,no impact to the subject property is anticipated from these features at this time. The pipe discharging water to the ground on the adjacent property may be indicative of inappropriate i. waste disposal at that property; further investigation is warranted. L. 5.0 CONCLUSIONS AND RECOMMENDATIONS Given the historical use and storage of agricultural chemicals and petroleum products on the subject V property, meaningful conclusions regarding the presence or extent of such material cannot be determined without soil sampling and analysis. Such sampling and analysis is particularly warranted in the conversion of agricultural land to residential uses,as is the case with this property. NOA has been L, retained by Kimball Hill Homes to perform a Phase II Environmental Site Assessment on the subject property to investigate whether agricultural chemical residues remain in the soils of the property and whether contamination exists on the subject property in the vicinity of the former underground storage tank on the adjacent property. Once the drums and debris have been cleared from the interior and vicinity of the barn, a qualified environmental professional should be retained to inspect the area for evidence of contamination which previously may have been obscured by the debris. Because no staining was observed in the vicinity of the transformers, 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 from the transformers, PG&E should be contacted to test,retrofit, or replace the transformers. 12 r