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MOUNTAIN HOUSE TEIeIRA-SOUZA PROPERTY Page 2 WKA No. 5475.03 January 6, 2006 Laboratory testing for hazardous materials in the groundwater and subsurface soils beneath the property was beyond the scope of this assessment. Assessments for asbestos and lead-based paint were beyond the scope of this assessment. FINDINGS Site Description The subject property is located west of the city of Tracy in San Joaquin County, California. The subject property lies within a predominantly agricultural area west of Mountain House Parkway and north of West Grant Line Road (Figure 1). The rectangular-shaped property consists of approximately 90 acres of agricultural land and has San Joaquin County Assessor's Parcel Numbers (APNs)209-450-014, 209-450-015, and 209-450-016(Figure 2). Nick Kent-Basham, a WKA Staff Geologist, performed a field reconnaissance on December 29, 2005 to update the previously conducted Phase I ESA. The majority of the subject property consists of hay cropland. A dairy, undergoing waste-removal activities associated with the operations and maintenance of the dairy, is located on the eastern portion of the property, adjacent to Mountain House Parkway. A total of eight residences, all associated with the dairy, are located to the south of the main dairy operation. Five of the residences are single-family homes constructed of wood with wood/stucco siding. Three trailer- type mobile homes occupy the southwest comer of the residence area. A detached garage is located between the eastern most mobile home and the southernmost single-family residence. Although WKA could not find their buried locations, it is reasonable to presume that the rural residential sites operate with private septic systems and leach fields. There are at least two water supply wells on the subject property. One water supply well is located south of the cluster of residences in a pump house and one,possibly two, water supply wells are located just north of the former milking barn. The water supply well(s) located just north of the former milking barn may be a nested cluster of two wells possibly constructed in the same borehole, based on well head piping and pressure tanks observed during field reconnaissance. At the time of the previous field reconnaissance, performed by Jeffrey L. Gubac of WKA in June 2003, there were a total of five covered holding corrals located on the northern portion of the dairy INK WALLACE•KUHL &ASSOCIATES INC