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Mr. Stephen R Thumlert 3 Siegfried Engineering, Inc. Page 2 of 3 Lane also reviewed an aerial photograph provided by the United States Department of Agriculture (early 1970s) for information regarding historical site uses. 2.0 PROPERTY DESCRIPTION 2.1 Site Description The subject property is located near the center of Section 11, Township 4 North, Range 7 East, Mount Diablo Base and Meridian, in San Joaquin County, California. The parcel is currently used as rural residential. One permanent structure is located in the southeastern portion of the property, a private residence identified as 24270 Sowles Road,.Acampo. Other improvements include a fenced I horse corral and a small wooden shed with no foundation. The majority of the parcel is currently undeveloped and is not actively used for agriculture. According to the current property owner, Mr. David Long, oat hay had been grown on a portion of the property approximately three years ago. 2.2 Physical Setting The site is situated on relatively flat terrain, varying in elevation from approximately 95 to 100 feet above mean sea level. A copy of a partial topographic map (USGS 7 t/2 Minute Quadrangle, Lockeford, California) is included in Attachment B. No surface water bodies are located within the property boundaries. However, shallow surface water was present over a small portion of the property in the north-central portion of the parcel. The southwest flowing Mokelumne River is located approximately,2.3 miles southeast of the property. According to the U.S. Department of Agriculture's "Soil Survey of San Joaquin County, California," soil units at the property include Bruella sandy loam and San Joaquin loam. Excerpts from the USDA Soil Survey report that describe these soil types are included in Attachment C. 3.0 POTENTIAL ENVIRONMENTAL HAZARDS 3.1 Potential Non-point Sources of Hazardous Materials The current property owner has no specific knowledge of any chemical usage at the property. Oat hay was grown on a portion of the property approximately three years ago. An aerial photograph circa 1970s (USDA) indicates that the parcel was either fallow or used for wheat/hay during that timeframe. 3.2 Potential Point Sources of Hazardous Materials No evidence of surface spilling, underground tanks, above ground tanks, or chemical storage areas were observed during the site reconnaissance. A copy of an Environmental Site Assessment Questionnaire completed by Mr. Long is included in Attachment D. Attachment D also includes an environmental database report for the property pursuant to ASTM Designation E-1528, Standard !� Practice for Environmental Site Assessments: Transaction Screen Process. The site address does not appear on any databases covered by the report. The residence, located in the northwestern portion of the parcel, was reportedly built in 1978. The septic tank and leach field is reportedly located on the north side of the residence, well away from G:\Data1GROLTNDZE\PHASEI\sieg-tong2.doc