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Project No.E8062.WTP Phase I Environmental Site Assessment/Lathrop,CA October 21, 1999 3.1 Aerial Photographic Site Features Aerial photographs from the past 31 years revealed no significant changes occurring at the subject site. In 1968, the site was used entirely as farmland as it is today. The mobile home park existed to the west of the site, and there were orchards to the southwest. The other surrounding properties were mostly farmland and grazing land with private residences to the northwest, northeast, and to the south. By 1985, there were no longer orchards to the southwest, but a few structures were apparent on the property. No changes to the subject site or the surrounding properties were seen in any of the more recent photographs from 1992 and 1996. 3.2 Historical Topographic Map Site Features Historical topographic maps revealed no development or other features at the subject site for the past 87 years. In 1912, there were roads along the northern and southern of the property, and a residence was indicated to the northeast. Wells were shown on the properties to the northeast and to the southeast in 1946. The mobile home park to the west of the site was indicated in 1968. A few private residences were shown on the properties to the south of the site in 1987. 3.3 Interview with Property Owner TERRASEARCH, inc. interviewed one of the current property owners, Ms. Diane Holst, to inquire about the subject site. According to Ms. Holst, the site has been in her family since _ before 1946. Ms. Holst indicated that the site has been used for agricultural purposes exclusively, and that no development has ever occurred at the site. Ms. Holst also stated that in the 1960s, the U.S. Army Corps of Engineers built the levees around the San Joaquin River. Once the U.S. Army Corps of Engineers was completed with the levees, they placed the leftover construction materials and debris on the western portion of the site. This area was permitted through the California Regional Water Quality Control Board (CRWQCB) as a Class III non-hazardous waste landfill (Frewert Road Class III Disposal Site). Furthermore, she stated that no hazardous have ever been stored on the property, and that at least one well exists on the site. 4. REVIEW OF PUBLIC RECORDS OF REGULATORY AGENCIES 4.1 Primary Contamination Sources TERRASEARCH, inc. contacted the anuin County Environmental Health Division to review any files for the subject site. No files were o or the subject site, indicating t no USTs are present and that the site has never been reported as contaminated. In addition, TERRASEARCH, inc. contacted the Lathrop Fire Departmegt_to identify any files indicating that hazardous waste has been stored, used, and/or disposed at the subject site. There were no records or permits for USTs or other hazardous material storage at the subject site. TERRASEARCH, inc. Page 7