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Surface &Subsurface Contamination Report Page 3 Sandbu Property Project No. 522.1 March 9.2006 Agricultural chemicals reportedly have not been used since about 1990 when the trees were removed and the Property was converted to use to produce hay. Environmental Conditions Impacting Site from Off Site Properties As a part of this investigation, EDR was contracted to perform a search of State and Federal electronic environmental databases for an areas around the Property (see Appendix D). The Property was not identified in the EDR database report. An adjacent site at 35100 S. Highway 33, Western Farm Service, was identified as the target of an ongoing remedial investigation of a ; surface release of fertilizer that has impacted the underlying groundwater. Another nearby site at 35275 S_ Welty Road is the target of a remedial investigation of a release of petroleum products and crude oil. Based on the results of the EDR report, the two sites described above were further investigated by requesting access to records on file with the San Joaquin County Environmental Health Department (Section 3.2 &Appendix E). Based on the information reviewed (Appendix E), Western Farm Service has released agricultural chemicals that have impacted the shallow groundwater -- under the southern part of the Property with elevated concentrations of nitrates, ammonium, and volatile organic compounds derived from pesticides. Based on lab tests of nearby water production wells, it appears tha only the shallow / �, r undwater has been impacted and the water supply wells in the area r uncontaminated_ Public wells in the area produce water from below 150 feet, which most likely is below the major aquitard in the area (the Corcoran Clay). It is likely that these deeper aquifers will produce groundwater that meets established standards for drinking water quality_ The site across Highway 33 from Western Farm Service (35275 S_ Welty Road) has reported releases of crude oil a*d diesel fuel. } The crude oil is from a decommissioned crude oil transmission`pipeline that runs along the UPRR railroLdoels "n'0�00a-ppear r . Based on available groundwater sample data (Appendix E), i the petroleum hydrocarbons have impacted the groununder the subject Property, but they have been detected under the western side of the Western Farm.-Service site, only a short distance from the subject Property_ A ohne station formerly was present at the southeast corner of Welty Road an=gway 33. The station does not appear to have been specifically investigated, but groundwater samples collected loin gear the site in connection with the other two remedial investigations do not suggest that a significant gasoline release has impacted the groundwater.- 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, CA 95356 Fax: (209)569-0295