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KLEINFELDER 14, 2005, about 12 inches of water was placed in the holes for pre-soaking. On June 15, 2005, the percolation tests were started at about 8:30 AM in accordance with SJCEHD accepted guidelines, using clear potable water. None of the holes exhibited a sloughing or caving. The holes were 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 30-minute intervals for four hours, refilling as necessary to maintain the prescribed amount of water over the gravel (SJCEHD Procedure #2). -S' Under the observation of a representative from the SJCEHD, the last 30-minute reading of the 4-hour period was used to calculate the percolation rate in minutes per inch. Copies of our field percolation test results are attached (Plates 8 and 9).�", G f Additional details regarding each test can be found on the attached percolation test sheets. On July 11 2005 samples of_groundwat—or were obtained using clean procedures from a spigot at the head of the irrigation well located near the middle of the property. A permit fort the well was not on file with . 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 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 3 should be considered approximate. 6. GROUNDWATER y Groundwater was not encountered in the 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 L 1999) show groundwater levels in the project area ranging from about 20 to 30 feet below ground surface. Based on Lines of Equal Elevation of Groundwater contour maps, the groundwater gradient in the project area is generally to the north and Lnorthwest. Local gradient variations may occur due to well usage. We understand that a new well will be constructed on the property y water for the new facility. We anticipate that the predominant use of groundwater will be for domestic and landscaping purposes. LThe results of the groundwater tests to determine the concentratio of nitr to (N) in the water sampled from the on-sit wwe indicate ..6.�Qonceotration s2f 0. g/I. DBCP was not present in detectable amounts. This i ate concentration is elo foie state drinking water standard. Copies of the test re Its and the chain-of-custody are ` presented on Plate 10. p 43498.G01/ST05R1014 Septennt 27,201 L Copyright 2005 Kleinfelder, Inc. \ � � �/ 4</crp. f 7