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will likely require side-slopes significanfly flatter than those for Type C soils. Temporary <br /> excavations in Type C soiLs should be constructed at a minunum of 11/z foot horizontal to <br /> every 1 foot vertical within excavations. <br /> The underling clay till soiLs encountered in the borings will generally be Type B soils under <br /> Departrnent of Labor Occupational Safety and Health Administration(OSHA)guidelines. <br /> Temporary excavations in Type B soils should be constructed at a minimum of 1 foot <br /> horizontal to every 1 foot vertical within excavations. <br /> We recommend the required slopes be further evaluated during construction. If site <br /> constraints do not allow the construction of slopes with these dimensions then temporary <br /> shoring may be required. <br /> 5.2 Observations <br /> A geotechnical engineer should observe the excavation bottoms to evaluate if the subgrade <br /> soils are similaz to those encountered in the borings and adequate to support the proposed <br /> construction. <br /> 5.3 Backfill and Fills <br /> We recommend density tests of backfill and fills placed during grading activities.Samples of <br /> the proposed materials should be submitted to our laboratory prior to placement for <br /> evaluation of their suitability and to determine their optimum moisture content and <br /> maximum dry density(Standard Proctor). <br /> 5.4 Testing <br /> We recommend density tests of backfill and fills placed for the proposed house foundaiion. <br /> Samples of the proposed materials should be submitted to our laboratory prior to placement <br /> for evaluation of their suitability and to determine their optimum moisture content and <br /> maximum dry density(Standard Proctor). <br /> 5.5 Winter Construction <br /> If site grading and construction is anticipated to proceed during cold weather,all snow and <br /> ice should be removed hom cut and fill areas prior to additional grading and placement of <br /> fill. No fill should be placed on frozen soil and no frozen soil should be used as fill or <br /> backfill. <br /> Concrete delivered to the site should meet the temperature requirements of ASTM and/or <br /> AQ. Concrete should not be placed on frozen soil. Concrete should be protected from <br /> freezing until the necessary strength is obtained. Frost should not be permitted to penetrate <br /> below the footings. <br /> 8 <br />