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May 5, 2005 NOA Project Number: E05057A 4.0 GROUND WATER INFORMATION 4.1 Ground Water Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground water depth and elevation maps were reviewed to determine the ground water levels near the Site. The Fall 1998 and Spring 1999 maps are the most current maps available from the county. Examination of these maps indicates that no water level data is available for the Delta area,which ` includes the Site, and no definite comments as to depth or gradient flow direction can be made. However, our office estimated that the ground water in the vicinity of the site lies between 0-5 feet below the ground surface. No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling of the percolation test holes to a depth of about three feet on April 11, 2005 and on April 25,2005. On April 12, 2005, our office drilled a ground water boring on the property;the location of this boring is depicted on Plate 1. Ground water was encountered just below three and a half feet in the boring. 4.2 Potential Ground Water Contamination Issues Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks,agricultural activities, dairies, septic systems, and storm water infiltration. Any past agricultural activities and the present use of septic systems in the area should be considered potential ground-water contamination sources. 4.3 Water Sample Location According to Ms. Rogers (personal communication April 25, 2005), one residential well is located on ` the property.The following permits were found for the subject property address of 6881 Roberts Road during EHD file review on April 6, 2005. 5