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` KLEINFELDER 2. PRESENT AND PAST USE The area of the proposed parcel has not recently been used. Based on information provided by a O the property owner, the parcel was used for a period of approximately six years for grazing of animals. Prior to that, to the best of our knowledge, the site was an undeveloped, unused field. 3. SEPTIC PERMITS AND PERFORMANCE 3. % 3 SJCEHD files were searched to identify septic permits at parcels in the project vicinity. There _ was one SJCEHD septic permit on file for the new installation of the existing septic system at the subject parcel. Fourteen permits were reviewed for ten parcels located adjacent to or near the subject property. These permits were for new installations and repairs/additions to existing septic systems. The majority of the permitted sewage disposal systems were for conventional septic/leach field systems with 25-foot deep seepage pits. A summary of the permit information is presented on Plate 3, and copies of the permits are attached. 4. GROUNDWATER ` — Groundwater was not encountered in our soil profile boring 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 (1981 to 1999) show ` groundwater levels in the project area ranging from about 110 to 145 feet below ground surface. Based on Lines of Equal Elevation of Groundwater contour maps, the groundwater gradient in the project area is generally from south to north. Local gradient variations may occur due to well usage. Groundwater from the on-site well is currently used for domestic purposes. We anticipate that ` the predominant use of groundwater will remain the same upon completion of the proposed improvements. On November 30, 2004, samples of groundwater were obtained using clean procedures from a spigot at the head of the domestic well located near the existing residence. A permit for the ` well was on file with SJCEHD. The permit states that the well was installed in August of 1988 to a depth of about 250 feet. An 8-inch diameter casing was installed in the well, and the well was sealed to a depth of about 50 feet. The water samples obtained from the well were delivered to a laboratory on ice that same day using chain-of-custody procedures for DBCP and nitrate (N) testing. The results of the analysis indicate a nitrate (N) concentration of 2.5 ms/1 and that DBCP was not present in detectable amounts. This nitrate concentration is below the state drinking water standard. Copies of the test results and the chain-of-custody are attached. We do not know of groundwater contamination issues at the site at this time. Although the majority of the surrounding land is not currently farmed, the potential exists for groundwater to be contaminated through the use of pesticides and herbicides. Potential sources of nitrate to 51727.G01/ST04R1700 December 17,2004 ©2004 Kleinfelder,Inc. Page 2 of 6