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• Mr. Jim Stover <br />January 31, 1997 <br />page 2 <br />These test results are consistent with our experience with expansive soils. The expansion <br />potential is directly related to the soil moisture and density. This is why we recommended the <br />low percent of compaction and high moisture content for reclaimed fill placement. The lower <br />the density and the higher the moisture content, the lower the expansion potential. In our July, <br />1996 preliminary geotechnical engineering study we found portions of the clay overburden to <br />possess a very high expansion potential. These materials had a hard consistency with generally <br />high dry density and low moisture content. Although moisture-density relationship <br />determinations were not developed for all of these clays, we believe the in-situ conditions will <br />have a dry density at or above the maximum dry density and moisture contents below optimum. <br />It is our opinion that properly prepared reclaimed fill slopes will have adequate shear strength <br />for stability of the slope and that wetting of the fill material through natural precipitation and <br />runoff will not adversely affect the soil strength. In their in-situ conditions, soil expansion of <br />the hard clay is a consideration for structure and floor slab support; however, in a reclaimed fill <br />condition with controlled moisture and density soil expansion is not a consideration. <br />• If we can provide further information, please contact our office. <br />Respectfully submitted, <br />MAJQA4 <br /> <br />David H. Adams, P <br />Project Manager <br />Rev. By: AJL <br />/DHA <br />14486 ~Y+: <br />,_'~3 <br />• <br />