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RVC Homes <br /> Project BABX-01-0124 <br /> April 12, 2001 <br /> Page 11 <br /> penetrate below footings bearing on frost-susceptible soil since such freezing could heave and crack the <br /> footings and/or foundation walls. <br /> E. Procedures <br /> E.1. Drilling and Sampling <br /> We performed the penetration test borings on March 23 and March 26, 2001, with a drill rig mounted <br /> on an off-road carrier, equipped with 3 1/4-inch inside diameter hollow-stem auger. Sampling for the <br /> borings was conducted in general accordance with ASTM D 1586, "Penetration Test and Split-Barrel <br /> Sampling of Soils." We advanced the boreholes with the hollow-stem auger to the desired test depths. <br /> A 140-pound hammer falling 30 inches was then used to drive the standard 2-inch split-barrel sampler <br /> a total penetration of 1 1/2 feet below the tip of the hollow-stem auger. The blows for the last foot of <br /> penetration were recorded and are an index of soil strength characteristics. Samples were taken at <br /> 2 1/2-foot vertical intervals to the 20 and 40-foot depths and then at 5-foot intervals to the termination <br /> depths of the borings. A representative portion of each sample was then sealed in a glass jar capped <br /> with a lid. <br /> E.2. Soil Classification <br /> Our drill crew chief visually and manually classified soils encountered in the borings in general <br /> accordance with ASTM D 2488, "Description and Identification of Soils (Visual-Manual Procedure)." <br /> A summary of the ASTM classification system is attached. All samples were then returned to our <br /> laboratory for review of the field classifications by a geotechnical engineer. Representative samples <br /> will remain in our office for a period of 60 days to be available for your examination. <br /> E.3. Groundwater Observations <br /> Immediately after taking the final samples in the bottoms of the borings, our drill crew probed the holes <br /> through the hollow-stem auger to check for the presence of groundwater. Immediately after withdrawal <br /> of the auger, the holes were again probed and the depths to water or cave-ins were noted. The borings <br /> were then immediately backfilled with quickset grout. <br /> F. General Recommendations <br /> F.1. Basis of Recommendations <br /> The analyses and recommendations submitted in this report are based upon the data obtained from the <br /> soil borings performed at the locations indicated on the attached sketch. Often. variations occur <br />