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Tt 3 7� 01 May 2007 AGE-NC Project No. 07-1516 t Page 12 of 39 T. 3.7 OIL AND GAS WELLS T. The EDR report references California Oil and Gas Well information as additional environmental record sources.The subject property appears to be located near the Vernalis Gas field;no wells were .r, shown on the property or adjacent properties; three wells were located between '/4 and ''/2 mile and 15 wells were located between '/z and one mile from the subject property. T The wells do not appear to be on or adjacent to the subject property;AGE has no direct evidence that the property has been impacted by gas field operations. T. 3.8. PRIOR AGRICULTURAL USE Aerial photographs show that the southern portion of the subject property was utilized as orchards from at least 1957 to 1963;the 1982 and subsequent photographs do not appear to show the property utilized for agricultural purposes. Agricultural use of land creates potential for soil and ground water to have been impacted by agricultural chemicals such as pesticides,herbicides and fertilizers.AGE found no direct indications, such as chemical storage or dumping, spilled powders, discolored or stained soil, or stressed vegetation, that the property has been significantly adversely impacted by agricultural chemicals. AGE notes that the property formerly stored and used agricultural chemicals,but the buildings and storage areas were removed by the time of the site reconnaissance. 3.9. PREVIOUS ENVIRONMENTAL INVESTIGATION AGE was not supplied reports or documentation from previous environmental assessments conducted on the subject property. The San Joaquin County Environmental Health Department had purged historical files and only a site map listing previous site investigations was available; AGE contacted the Department of Toxic Substances and Control (DTSC) on 27 March 2007 and was authorized for file review on 18 April 2007 for information concerning report files. The following information was compiled from various sources. Pesticide Discharge Area Investi ate? ions • 1982: The property was identified as a potentially contaminated property by San Joaquin County.Hazardous waste inspections,drive-bys and questionnaires performed in 1982 noted that the property was used as a crop dusting service from at least 1949 and the Tracy Rural Fire Department inferred that there was waste discharge of agricultural chemicals to the Advanced GeoEnviron mental,Inc.