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Hennepin Pazks , <br /> Project BABX-91-589 <br /> December 19, 1991 <br /> � Page 8 ' <br /> � <br /> D.4 Testin , <br /> g <br /> We recommend density tests be taken in the backfills and fills placed beneath footings, slabs <br /> and pavements. We also recommend� density testing of the compacted pavement subgrade and , <br /> gravel base course. Samples of proposed backfill and fill materials should be submitte� to our <br /> testing laboratory at least three days prior to placement for evaluation of their suitability and ' <br /> determination of the optimum moisture content and maximum dry density. <br /> D.5 Cold Weather � <br /> If site grading and construction is anticipated during cold weather, we recommend that good <br /> winter construction practices be observed. All snow and ice should be removed from cut and , <br /> fill areas prior to additional grading. No fill should be placed on soils which have frozen or <br /> contain frozen material. No frozen soils should be used as fill. ' <br /> Concrete delivered to the site should meet the temperature requirements of ASTM C 94. <br /> Concrete should not be placed upon frozen soils or soils which contain frozen material. , <br /> Concrete should be protected from freezing until the necessary strength is attained. Frost <br /> should not be permitted to penetrate betow footings bearing on frost-susceptible soil since , <br /> such freezing could heave and crack the footings and/or foundation walls. <br /> E. Procedures <br /> ' <br /> E.1 Drilling and Sampling 1 <br /> The penetration test borings were performed on November 25, 1991, with an off-road, rubber <br /> tired mounted core and auger drill equipped with 3 1/4-inch inside diameter hollow-stem ' <br /> auger. Sampling for the borings was conducted it� general accordance with ASTM D 1586, <br /> "Penetration Test and Split-Barrel Sampling of Soils." Using this method, we advanced the ' <br /> bore hole with the hollow-stem auger to the desired test depth. A 140-pound hammer falling <br /> 30 inches was then used to drive.the standard 2-inch split-barrel sampler a total penetration of <br /> 1 1/2 feet below the tip of the hollow-stem auger. The blows for the last foot of penetration , <br /> were recorded and are an index of soil strength characteristics. Samples were taken at <br /> 2 1/2-foot vertical intervals to the 10-foot depth 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. <br /> ' <br /> � <br />