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KLEINFELDER 1. SITE DESCRIPTION / PROPOSED DEVELOPMENT At the time of our investigation, each of the approximate 5-acre subject parcels was composed of unused land. The parcels are zoned AL-5 (Limited Agriculture). The three parcels were bound on all sides by agricultural land with scattered single-family residences. We understand that a single-family residence will be constructed in each of the subject parcels. At the time of our original investigation, a building pad for a single-family residence was being prepared in the western portion of lots 16 and 17, and the extension of Watkinson Road that will provide axis to the site was being rough graded. A map showing the parcels with the proposed locations of the residences is presented on Plate 1 . 2. PRESENT AND PAST USE At the time of this investigation, the study area consisted of vacant land. Based on information provided by the property owner, agricultural uses, primarily the grazing of horses and cattle, are the only known site uses. No known commercial or residential uses of the study area are known. 3. SEPTIC PERMITS AND PERFORMANCE SJCEHD files were searched to identify septic permits at parcels in the project vicinity. There were no permits on file for the parcels proposed for development. Twelve permits were reviewed for eight parcels located adjacent to or near the subject property. These permits were for new installations and repairs/additions to existing septic systems. Each of the permitted residential sewage disposal systems was for conventional septic/leach field systems with 25-foot deep seepage pits. A summary of the permit information is presented on Plate 2, and copies of the permits are attached in Appendix B. 4. GROUNDWATER Groundwater was not encountered in our soil profile borings drilled for this investigation. Lines of Equal Depth to Groundwater contour maps published in groundwater reports by the San Joaquin County Flood Control and Water Conservation District (1982 to 1999) show groundwater levels in the project area ranging from about 120 to 165 feet below ground surface. Based on Lines of Equal Elevation of Groundwater contour maps, the groundwater gradient in the project area is generally from east to west. Local gradient variations may occur due to well usage. At the time of our original investigation, a well was being installed for the proposed residence at Lot 17 (Parcel 021-030-53). Domestic wells have since been installed at 57556.G01/ST05R687R August 25,2005 2005 Kleinfelder, Inc. Page 2 of 5