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.r k'q KLEINFELDER We understand that the existing well on the property will be used to supply water for the new facility. No new wells are planned. We anticipate that the predominant use of 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 8.6 mg/I. This nitrate concentration is below the state drinking water standard of 10 mg/I. DBCP was present in detectable amounts at a concentration of 1.4 Ng/l. Copies of the test results and the chain-of-custody are presented on Plate 10. We do not know of any existing and/or potential groundwater contamination issues in the project vicinity. There are no existing gas stations or dairies adjacent to the property. Seasonal fertilization of the off-site agricultural land, if performed, and other septic tank/leach field systems in the project area is probably the largest contributor of nitrogen to groundwater in the project vicinity. 7. SOIL PROFILE The subsurface soil encountered in our soil profile boring consisted of low-plastic clay to a depth of less than 1 foot below site grade, followed silty sand to a depth of about 4 feet. The sand was underlain by low- to non-plastic sandy silt to a depth of about 7 feet, followed by highly-interbedded strata of clayey sand, silty sand, and clayey silt to the depth explored. The Soil Survey of San Joaquin County, California published by the U.S. Department of Agriculture, Soil Conservation Service (1992) refers to the near-surface soil within the project area as belonging to the Acampo Sandy Loam soil series (Map Symbol 101). This soil is described as having "moderate" percolation characteristics for septic tank absorption. Other attributes are given in the table below: Map Soil Name Available Water PH Organic S mbolCapacity, inches/inch Content, percent 101 Acampo Sandy Loam 0.10 - 0.14 6.6 - 8.4 1-3 8. PERCOLATION TESTING The results of our percolation tests are presented below. Copies of our field percolation test results are attached. b. 59149.G01/ST05R1062 December 15,2005 Copyright 2005 Kleinfelder,Inc. Page 4 of 7