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07/13/2006 08:420 FAX 00 10 .7/028 Perforated PVC pipe. Before noon an May 17, 2006, about 12 inches of water was placed in the hole for pre-soaking. On May 18, 2006, the percolation test was started at about 7:00 AM in accordance with -SJCEHD accepted guidelines, using clear potable water. The hale did not exhibit sloughing or caving. The hole was empty of water prior to testing. From a fixed reference point (a marked location on the side of PVC pipe), the drop in water level was measured in approximate 10-minute intervals for the first hour and a half (SJCEHD Procedure ##3) and 30-minute intervals for the remaining three hours (SJCEHD Procedure #2), refilling as necessary to maintain the prescribed amount of water over the gravel. 10-minute readings were taken during the first hour and a half due to the fast percolation characteristics of the soil tested. Under the observation of a representative from the SJCEHD, the last 30-minute reading of the test was obser,(ed and the percolation rate, in minutes per inch, was calculated. The percolation rate was calculated using the reading taken at the end of the first hour Of the test (SJCEHO Procedure ##3) due to the fast percolation characteristics of the subgrade soil. The SJCEHD representative approved the test results for the percolation test hole P-1, A copy of our field percolation test result is,attached on Plate 7. On May 23, 2006, samples of groundwater were obtained using clean procedures from i a spigot at the head of the domestic well located near the existing residence. A permit for the well was not on 'Elle with SJCEHD. The water samples obtained from the well were delivered to a laboratory on ice that same day using chain-of-custody procedures for USCP and nitrate (N) testing. The boring and percolation test holes were located in the field by visual sighting and/or pacing from existing site features; therefore, the locations shown on Plate 2 should be considered approximate. 6. GROUNDWATER Groundwater was encountered in the soil profile boring drilled for this investigation at a depth of 7 feet below existing site grade. 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 9 to 26 feet below ground surface, Based on Lines of Equal Elevation of Groundwater contour maps, the groundwater gradient in the project area is generally from the northwest to the southeast. Local gradient variations may occur due to well usage. We understand that a new well will be installed on the property and will be used to supply water for the new facility. We anticipate that the predominant use of groundwater will be for public and landscaping purposes. r a 71324.G011ST00R759 July'3'2006 Copyrighl 2006 WeintcldCr.InC. raga,3 0,9