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. Paul M adson and <br /> Associates, Ltd. <br /> • Project BABX-92-813 <br /> January 6, 1993 <br /> Page 5 <br /> replaced with a crushed rock. This will provide a more stable working platform for <br /> construction of footings, if needed. <br /> D.2 Observations <br /> We recommend that all excavation, footing and slabs be observed by a geotechnical engineer to <br /> evaluate if the subgrade soils are similar to those encountered by the borings, adequate to <br /> support the proposed construction and adequately oversized. These observations should be <br /> conducted prior to placing backfills, fills or forms for footings. <br /> After excavating for footings, we recommend that tests be conducted on the subgrades to <br /> evaluate if the bearing capacity is at least 3,000 psf. Typical instruments used for these tests <br /> include hand augers, penetrometers and sample tubes. <br /> D.3 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 below footings bearing on frost-susceptible soil since such <br /> freezing could heave and crack the footings and/or foundation walls. <br /> E. Procedures <br /> E.1 Drilling and Sampling <br /> The penetration test borings were performed on December 15, 1992, with an off-road mounted <br /> core and auger drill equipped with 3 1/4-inch inside diameter hollow-stem auger. Sampling for <br /> the borings was conducted in general accordance with ASTM D 1586, "Penetration Test and <br />