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Surface and Subsurface Contamination Report l��rracon 6671 & 7101 E. Highway 12 ■ Lodi, California September 22, 2015 ■ Terracon Project No. NA157033 3.3 Current On-Site Sources of Contamination No above- or below-ground on-site potential or known sources of contamination were identified from current uses of the site, except for the following: • Agricultural chemicals continue to be applied on the property. • Three pole mounted transformers potentially containing PCBs are located on the site. • An approximately 300 gallon AST used periodically for diesel fuel is located on site. 3.4 Past Offsite Sources of Contamination No above- or below-ground off-site potential or known sources of contamination were identified ,1 from past uses of the surrounding properties, except for the following: J • 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. • One approximately 300 gallon AST not located within secondary containment is located on the adjoining residential property address of 6671 E. Highway 12. 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES Agricultural chemical residues may remain on the property. No evidence was found, however, to indicate that the chemicals were applied inappropriately. The above-ground storage tank located on the site is not within a secondary containment area. Any and all leaks could potentially impact the soil. 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 �it,l) contaminant pathways on the site or vicinity. 5.0 CONCLUSIONS AND RECOMMENDATIONS Given the historical uses of agricultural chemicals and petroleum products on the site, 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, as is the case for this property. Responsive ■ Resourceful ■ Reliable 9