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FFile No. 20-3821-O1.G01 h" KLEINFELDER January 6, 1995 • Results of laboratory tests, including Resistance-Value (R-Value) • Recommendations for type and depth of foundations, including recommended maximum allowable soil bearing pressures • Recommendations for support of slab-on-grade floors • Recommendations for site preparation and grading • Recommended pavement sections • Results of percolation testing and comments for use in drainage basin design IV. SITE CONDITIONS At the time of our field explorations, the project site was relatively flat and had recently been disked. A small amount of disked vegetation covered the site. An irrigation standpipe was present between the project site and Harlan Road. The locations of any underground utilities are not known to our firm at this time. V. FIELD EXPLORATIONS The field explorations for this project were performed on December 7, 1994, and consisted of drilling four test borings to depths of approximately 10 to 211/2 feet below the existing ground surface. The borings were located previous to our field explorations by Siegfried Engineering I and were drilled with truck-mounted drill equipment using 6-inch diameter, continuous-flight J augers. Continuous logs of the soils encountered in each boring were maintained by a field engineer of our firm, and relatively undisturbed soil samples were obtained for visual observation, classification, and laboratory testing. The soil samples were collected by driving 1 a 2-inch inside-diameter sampler into the soil using a 140-pound hammer falling approximately 30 inches. The number of blows required to advance the sampler into the soils is noted on the Logs of Borings, Plate A-3 through A-6, at the corresponding sample locations. i VI. SOIL CONDITIONS The surface soil conditions encountered at the locations explored generally consisted of loose, silty sands that extended to a depth of approximately 2 feet below the ground surface. Below the loose surface soils, silty sand and sandy silt soils were encountered that extended to depths of 6 to 9 feet below the existing ground surface. In boring B-1, the silty sands were underlain by alternating layers of sandy silty clay and sandy silts that extended to the maximum depth explored of 211/2 feet. In boring B-2 the silty sand was underlain by a relatively-clean sand that extended to a depth of approximately 15 feet, which was then underlain by a silty sand that extended to the maximum depth explored of 161/2 feet. In boring B-3 the silty sand was underlain by a layer of sandy silt that extended to the maximum depth explored of approximately 10 feet. The soils encountered below the loose surface soils varied in Copyright 1995 Kleinfelder, Inc. Page 2 of 9