Geotechnical Evaluation report-2004

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Aulik Associates Project BL-04-06716 October I1, 2004 Page 10 D.S. Cold Weather Construction If site grading and construction is anticipated during cold weather, we recommend that good winter construction practices be observed. All snow and ice should be removed from cut and fill areas prior to additional grading. No �11 should be placed on soils that have frozen or contain frozen material. No frozen soils should be used as fill. Concrete delivered to the site should meet the temperature requirements of ASTM C-94. Concrete should not be placed upon frozen soils or soils which conta.in frozen ma.terial. Concrete should be protected from freezing until the necessary strength is attained. Frost should not be pernutted to penetrate below footings bearing on frost-susceptible soils since such freezing could heave and crack the footings and/or foundation walls. E. Procedures E.1. Drilliag and Sampling We performed the penetration test borings on September 28,2004,with a truck-rnounted core and auger drill equipped with 3 1/4-inch inside diameter hollow-stem auger. Sampling for the borings was conducted in general accordance with AST'M D 1586, "Penetration Test and Split-Barrel Sampling of Soils." We advanced the boreholes with the hollow-stem auger to the desired test depths. A 140-pound harnrner falling 30 inches was then used to drive the standard 2-inch split-barrel sampler a total penetration of 1 1/2 feet below the tip of the hollow-stem auger. The blows for the last foot of penetration were recorded and are an index of soil strength characteristics. Samples were taken at 2 1/2-foot vertical intervals to the 15-foot depth and then at S-foot intervals to test boring termination. A representative portion of ea.ch sample was then sealed in a glass jar. E.2. Soil Classification The drill crew chief visually and manually classified the soils encountered in the borings in general accordance with ASTM D 2488, "Description and Identification of Soils (Visual-Manual Procedure)." A summary of the ASTM classification system is attached. The samples were then returned to our laboratory for review of the field classifications by a soils engineer. Representative samples will remain in our Minneapolis of�'ice for a period of 60 days to be available for your examination.