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J&A Solari, Inc. Page 9 of 11 Our Project Number: NA157007 February 20, 2015 • Surrounding properties have been used for agriculture in the past; agricultural chemicals may have been applied to these properties. 3.5 Current Off-Site Sources of Contamination No above- or below-ground off-site potential or known sources of contamination were identified from current uses of the surrounding properties, except for the following: • Surrounding properties are used for agriculture; agricultural chemicals may be applied to these properties. 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES Agricultural chemical residues containing chlorpyrifos may remain on the property. This chemical has been identified as toxic to birds and aquatic organisms. No evidence was found however, to indicate that the chemicals were applied inappropriately. Underground infrastructure may exist on the subject property in the vicinity of the former structures. 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. 5.0 CONCLUSIONS AND RECOMMENDATIONS Given the historical uses of agricultural chemicals 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 especially warranted in the conversion of agricultural land into residential use. Should future residents of the subject property be interested in determining the quality of their drinking water, EHD should be contacted for direction regarding the potential for impacts to groundwater from the agricultural history of the property and vicinity. The oil staining around the agricultural well head at the northern property boundary should be cleaned up, and a well service should be consulted to address possible maintenance issues at both wells on the property. 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. Any wells or septic systems identified which will not remain in use should be abandoned under EHD oversight. ,.,44 ©2015 Neil O.Anderson&Associates,Inc. A Terracon Company