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March 10,2003 <br /> NOA Environmental Project Nnmber:LE03-063 <br /> Page 7 <br /> areas the surface layer is sandy loam or loath... <br /> Permeability is moderate in the Kingdon soil. Available water capacity is high... <br /> T <br /> okay fine sandy loam: <br /> This very deep, well drained, nearly level soil in on low fan terraces. It formed in <br /> alluvium derived from granite rock sources... <br /> Typically, the surface layer is grayish brown fine sandy loam about 19 inches thick. <br /> The subsoil is grayish brown, brown, and pale brown fine sandy loam about 26 <br /> inches thick. The substratum to a depth of 60 inches is pale brown fine sandy loam... <br /> Permeability is moderately rapid in the Tokay soil. Available water capacity is <br /> high... <br /> In their UST Sampling Results and Recommendations for Further Action dated August 11, 1992, <br /> T&T Earth Services made the following statements about soil conditions encountered during baring <br /> in and around the former UST excavation pit: <br /> The surface units down to about 20 feet... should... be characterized as clays with <br /> a high sand component. <br /> Hydrologic conductivities within these units should be in <br /> the range of.002 to.1 meter per day: The clean sand unit from 20 to 25 feet should <br /> have a hydrologic conductivity:of.I to 2.5 meters per day. <br /> The entire sampled area is underlain by a tight clay unit at 34 to 35.feet. The bottom <br /> of this clay layer was not encountered but it was at least1.5 feet thick in hole 42. <br /> General Groundwater Conditions <br /> According to the San Joaquin County, California,Flood Control-and Water Conservation District <br /> Spring 1999 Groundwater Report, depth to water in the vicinity of the subject property is between <br /> 40 and 50 feet, and the groundwater gradient.slopes down to the east-northeast- at a rate of <br /> approximately twenty feet per mile. <br /> T & T Earth Moving Services stated the following about on-site ground water conditions: <br /> No ground water was encountered in any of the holes nor was evidence of seasonal <br /> saturation encountered. Investigation into the probable depth to water indicate <br /> seasonal fluctuations from about 45 to 60 feet below ground surface in the area. <br /> - r <br />