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'. -27- <br />' S-foot topsoil depth. Estimated shrinkage losses for excavated soils <br />are approximately 5 to 158 for the granular soils and 0 to 508 for the <br />stiff to hazel clays. These losses are based on approximated fill <br />' density and do rot take into account loss due to transport, wind, <br />etc. <br />' FIATER SOLUBLE SULFATES <br /> The concentration of water soluble sulfates rmasured in samples <br />' obtained from the exploratory test holes generally ranges from less <br /> than 0.0058 to approximately 0.1258 (Table I). These concentrations <br /> of water soluble sulfates in the soils and bedrocks at the site <br /> generally represent a negligible degree of sulfate attack on concrete <br /> d <br />i <br /> expose <br />to these mater <br />als. The degree of attacJc is based on a range <br />' of negligible, positive, considerable and severe presented in the U.S. <br /> Bureau of Reclamation Concrete ,•:anual. A negligible attack is <br />' predicted for percent water soluble sulfates in the range of 0.00 to <br /> 0.108. <br />' Based on this information, we do not believe that special sulfate <br />' resistant cement will be required for concrete exposed to the on-site <br /> soils. <br />' • <br /> LIMITATIONS <br />' This report has been prepared in accordance with the generally <br /> accepted geotechnical practices in the area for use try the client for <br />' desi <br />s <br />Th <br />l <br />i <br />d <br />d <br />i <br />b <br />itt <br />d i <br /> gn purpose <br />. <br />ons an <br />e conc <br />us <br />recommen <br />ons su <br />m <br />n <br />at <br />e <br />' this report are based upon the data obtained from the test borings <br /> <br /> <br />