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M 06/28/2006 12:48 FAX IZO07/027 perforated PVC pipe, Before noon on May 17, 2006, about 12 inches of water was placed in the bole for pre-soaking. On May 18, 2006, the percolation test was started h SJCEHD acce ted guidelines, nD*, at about 7:00 AM in accordance with p potable water. The hole did not exhibit sloughing or caving. The hole was noof water prior to testing. From a fixed reference paint (a marked location on t PVC pipe), the drop in water level was measured in approximate 30-minute intervals for four hours, refilling as necessary to maintain the prescribed amount of water over the gravel (SJCEHD Procedure #2). Under the observation of a representative from the SJCEHD, the last 30-minute reading of the four-hour period was used to calculate 'I thep ercolation rate in minutes per inch. 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 a spigot at the head of the domestic well located near the existing residence, A permit for the well was not on file 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 DECP 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 malas published in groundwater reports by-the Sari Joaquin County Flood Water Conservation District 1981 to 1999) show groundwater levols in Control and a ( the project area ranging from about 9 to 25 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 dua 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 predominan use ox groundwater will be for public and landscaping purposes. The results of the groundwater analysis to determine the concentrations of nitrate (N) in the water sampled from the on-site well indicated a concentration of 14 mg/l. This nitrate concentration is not below the state drinking water standard of 10 reg/l. DSCP was not present in detectable amounts. Copies of the test results and the chain-of- custody are presented on Plate 8. 71.124.GU91STO5Rf5U1 fur::�23,2QtiFi Ga�yri�h:200ki Kko€nl(kiK,Ind, I -