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' Page 6 = West Lauffer Road Property February 16,2006 Job No. 2836-001 Jbetween the early 1960's and mid-1970's. The approximate locations and limited information regarding these wells are presented within the appended EDR Report. The drilling of oil and/or natural gas wells occasionally include pits containing drilling mud's containing heavy metals and hydrocarbons. Information gathered during past environmental investigations on other similar properties revealed that significant contamination conditions associated with gas well locations are rare, although low levels of _ hydrocarbon contamination may exist in soils beneath natural gas well locations. In our opinion, the likelihood of significant contamination conditions attributed to these former wells is slight. Polychlorinated Biphenyls (PCBs) /We observed no obvious evidence of PCB-containing equipment on the subject property. Ten pole- mounted transformers were observed on the property. The transformers appeared in good condition, F.+ with no evidence of stains or leakage. The transformers are owned and operated by the Pacific Gas and Electric (PG&E). Past communications with PG&E personnel have indicated that transformers of this type typically do not contain PCBs, although actual contents cannot be confirmed without testing. If necessary, PG&E will sample and analyze transformer contents for a fee. / Solid Waste Disposal Y Our research and reconnaissance have not revealed any evidence of past or present solid waste disposal on the property. F Pits, Ponds, and Lagoons 1/ We observed no evidence of past or present use of pits,ponds, or lagoons for wastewater treatment on the subject property. Agricultural Chemicals We are not aware of any significant past or present use of agricultural chemicals on the property. However, the property has been used for agricultural purposes (vineyards and orchards) for more than 90 years. In our experience, properties that have supported many years of orchard farming have the potential to exhibit elevated concentrations of agricultural chemicals such as lead-arsenate and organochlorinated pesticides. Additional pesticide contamination is also commonly attributable to the rinsing of application equipment after field application, when rinsing occurs in one place over a period of time. Such rinsing activities are usually performed at a farming headquarters or at an airport supporting crop dusting aircraft. Our research indicates that the subject property did not support any activities related to crop dusting; however, it is possible that the property did support farming headquarters at the on-site residential areas. /Communications with a San Joaquin County Public Water System representative, Ms. Adrian to Ellsaesser, indicate that other potential sources of contamination identified on farm lands and rural farm residences can be attributed to the long-term use of fertilizers and septic systems. According to Ms. Ellsaesser, a common contaminant known as dibromochlorporpane (DBCP), which is derived from a fungicide, is not commonly used in the general vicinity of the subject property. Ms. Ellsaessar further stated that nitrate issues associated with long-term septic use are usually site specific and can not be determined without further evaluation of site soils; however, Ms. Ellsaessar did mention that - regular analytical testing of groundwater in the general site vicinity has not revealed any known elevated nitrate contamination issues.