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\,a ../ ,. 31 August 2004 AGE-NC Project No.04-1188 Page 3 of 24 Hydrogeologic Group, which includes moderate infiltration rates. The corrosion potential for uncoated steel was high. The San Joaquin County ground water map data provided in Lines of Equal Depth to Groundwater, Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD) and Lines of Equal Elevation of Groundwater, Spring 1999, also published by the FCD&WCD does not extend to the north Tracy area. It is inferred that the subject property is in a shallow-groundwater area. 4.0. HISTORICAL USE The history of the subject site from as early as 1914 to present was research.Q,d by-reviewing aerial photographs,topographic maps,Pesticide Use reports and a personal interview. Based on available 1575 rmatlon, subject property use appears to have been undeveloped or agricultural land for at least 90 years. The 1914 topographic map shows the property as undeveloped land, the 1957, 1982 and 1993 aerial photographs show the property as agricultural land planted in what appear to be row crops.The current use of the property is to grow tomatoes;there is a small residential complex at the northeast corner. 4.1. AERIAL PHOTOGRAPHS Aerial photographs were utilized to determine the developmental history of the subject property and surrounding areas.Three aerial photographs,dated 1957, 1982 and 1993,were provided by EDR and one USGS aerial photograph, dated 1993,was reviewed on the Microsoft TerraServer Internet site ( http://terraserver.microsoft.com ). Not all of Parcel 27 is shown on the photographs. Subject Property:The property is shown as agricultural land,planted in what appears to be row crops or grasses. A levee extends between Parcels 26 and 27,a small pond or other water feature is noted on the north portion of the property and appears to extend along the west side of the levee. A residential complex at South Wing Levee Road is visible on all three photographs. Surrounding Properties. Surrounding properties in all directions appear utilized for agricultural purposes.A road is visible at the northwest corner of the property and a river extends along the south and southeast boundaries of the property.Additional residences are visible along South Wing Levee. Aerial photographs of the subject area predating 1957 and subsequent to 1993 were not readily available for review. No items of potential environmental concern for the subject property were Advanced GeoEnvironmental,Inc.