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December 23, 2005 NOA Project Number: E05150A Because three adjacent underground storage tank sites are separated from the subject property by East Main Street or Walker Lane, and based on the distance from the property and the overall southward Ldirection of groundwater flow,impacts to the property from those sources are not anticipated. 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 z ,i) 4 the groundwater beneath the subject property is contaminated with that constituent The pipe discharging water to the ground on the subject property may be introducing impacted groundwater to the land surface. Because no staining was observed in the vicinity of the three transformers along the eastern property boundary,the transformers are not considered an environmental threat to the subject property at this time. I �. Due to the approximate date of construction of the residence on the subject property,lead-based paints and asbestos-containing materials are likely to be present. The barn appeared to have been constructed of unpainted wood and,as such,is unlikely to contain such materials. 5.0 CONCLUSIONS AND RECOMMENDATIONS L. Given the historical use and storage of agricultural chemicals and petroleum products on the subject 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. L If the developer or the EHD are concerned about the potential for chemical residues across the property, contamination at the location of the former underground storage tank, or hexavalent chromium in the vicinity of the groundwater discharge near the barn,soil samples may be collected and analyzed. L Should the property owners or the EHD be concerned about PCB contamination from the Ltransformers,PG&E may be contacted to test,retrofit, or replace the transformers. Any wells or septic systems identified which will not remain in use should be abandoned under EHD L oversight. Any additional infrastructure or buried debris that may be encountered during site grading % �> or development should be removed or abandoned in accordance with all applicable regulations. L For further information on the Marley Cooling Tower site and local groundwater conditions, NOA recommends contacting Dudek&Associates. Questions or concerns regarding drinking water quality on the subject property and vicinity should be directed to the EHD and/or the California Water Service LCompany. 14 '044L L