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Lange Property Page 10 of 13 Our Project Number: LES08004 February 8, 2008 V/ .4 Past Off-Site Sources of Contamination No above- or below-ground off-site potential or known sources of contamination were identified from past uses of the surrounding properties, except for the following: • Surrounding properties have been used for agriculture in the past; agricultural chemicals i 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 I Agricultural chemical residues containing fenbutatin-oxide, fenpropathrin, and paraquat dichloride, may remain on the property. These chemicals are persistent or have been identified I as toxic to aquatic organisms or humans. No evidence was found, however, to indicate that the I chemicals were applied inappropriately. The potential exists of possible waterway contamination, given the proximity of Jahant Slough to the surrounding agricultural land and the reported application of agricultural chemicals toxic to aquatic life. However, no evidence was observed to indicate that the waterways are contaminants to aquatic organisms. Waterways such as Jahant Slough, can be used for indiscriminate disposal of potentially hazardous materials and can serve as contaminant pathways to surrounding property. 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. The waste water discharge ponds and land application area can serve as contaminant pathways into the soil and surrounding land if not maintained. In this case there are three monitoring wells in place which are being reported to the California Regional Water Quality Control Board(CRWQB) Central Valley Region, Order No. R5-2006-0088. 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 902 Industrial Way-Lodi,CA 95240-209.367.3701 -Fax 209.369.4228 02008 Neil 0.Anderson&Associates,Inc.