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6W <br /> June 15, 2006 <br /> rim NOA Project Number: E06057A <br /> 3.5 Current Off-Site Sources of Contamination <br /> No above- or below-ground potential or known sources of contamination to the subject property <br /> v were identified from current uses of the surrounding properties, except for the following: <br /> • Surrounding properties are use for agriculture;agricultural chemicals may be applied to <br /> these properties. <br /> • Debris pile to the west of the property. <br /> 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES <br /> .. Agricultural chemical residues may remain on the property. No evidence was found, however, to <br /> indicate that the chemicals were applied inappropriately. <br /> Dead vegetation appeared to be in an area of natural growth and does not appear to be abnormal. <br /> The pile of tires on the property could cause contamination if remained on the property. <br /> The abandon vehicles on the property may contain batteries, motor oil, or other contaminants. If <br /> left on the property they could cause contamination. <br /> At least one structure has been removed from the property. Any remnants of structures may <br /> contain lead paint or asbestos. <br /> Oil appeared to be leaking into the irrigation canal. This can cause water contamination if not <br /> maintained in a timely manner. <br /> If water wells are not properly operated and maintained, they can serve as contamination conduits <br /> to groundwater. Septic systems may be used for inappropriate disposal of hazardous substances. <br /> r In this case, it appeared that one domestic well was no longer in use. <br /> Two monitoring wells were identified onsite. They appear to be part of the monitoring of the <br /> `. river and no indications of contaminations were identified. <br /> 10 <br /> "004 <br /> r. <br />