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,._ <br /> Page 7 - #4220 91-1043 <br />" Standard Proctor density. Available information indicates that the excavation-refill system ' <br />: extended beyond the limits of the present construction to provide a ,1:1 lateral excavation , <br /> oversize as measured from elevation of pertinent foundation elements. <br />; In our opinion, the su�cial fill, topsoil and softer portions of the fine alluvium should ; <br /> not be relied upon for structural support. At the location of boring. #3, located very <br />-- near the southwest corner of the existing building, the fill encountered at depth appears <br />� to consist of moderately well-compacted fill placed during the excavation-refill earthwork <br /> for construction of the existing building. The results of laboratory testing performed on <br />_ selected fill samples indicates the present dry density of the fill is comparable at this <br /> location to the dry densities obtained at compaction test locations performed during the <br />� initial earthwork. <br /> r We recommend the in-place fill, topsoil and soft portions of the fine alluvium be <br /> y removed from the planned building area. The excavation should be extended beyond the <br />� edge of the planned building a minimum of 1' for each depth of excavation required <br /> below planned foundation grade (i.e., 1:1 lateral oversize). The minimum depth of <br />� excavation required at the boring locations is indicated in the following tabulation. <br />� Actual depth of excavation required will likely vary throughout the site, especially within <br /> the presently inaccessible portions of the site to the south of the planned building and <br /> the west edge. <br />