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Cotta Property Page 10 of 12 Our Project Number: LES080021 March 28, 2008 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. There is potential for surface runoff surrounding the burn piles and chemical wash area, which could contain contaminants, to drain into surrounding agricultural land on the subject property. This can adversely impact soil and possibly water quality. 5.0 CONCLUSIONS AND RECOMMENDATIONS Given the historical uses 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 especially warranted in the conversion of agricultural land into residential use. Due to the continued agricultural use, no soil sampling is recommended. 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 stained soil under the leaking tractor, farm equipment parking, drive areas and fueling area should be removed from the site and disposed of appropriately. The 350 gallon_AST and 55 gallon motor oil tanks should be placed in a secondary containment to prevent further soil staining. Additionally, any ASTs or drums which are to remain in use on the subject property should be placed within secondary containment. The drums located at the southwest portion of the subject property which are not to be used should be removed from the site and disposed of appropriately, along with all tires, and other debris. If the property owner or the EHD are concerned about the potential for elevated levels of metals in the surface soils located near the southwest corner of the property as a result of metal debris storage at that location, soil samples may be collected and analyzed. The portion of Beaver Slough located north of the subject property should be periodically monitored for indiscriminate disposal of potentially hazardous materials. 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 transformer, PG&E should be contacted to test, retrofit, or replace the transformer. If 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. '404 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02008 Neil O.Anderson&Associates,Inc.