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<br />GEC #5130 - Page 4 <br /> <br />Refer to the attached sheet for general information regarding ground water <br />conditions and observations. <br /> <br />General <br />Subsurface conditions can vary from that encountered in the borings at <br />other locations. depths. and times. Depending on the degree of variabi- <br />lity, this could: 1) necessitate altering our conclusions and recommen- <br />dations for design and construction procedures, and 2) affect the cost of <br />design and construction. The degree of variability could be evaluated by <br />additional exploration. <br /> <br />DISCUSSION, CONCLUSIONS, AND RECOMMENDATIONS <br /> <br />BUILDING AREAS <br /> <br />Controlled Earthwork - General <br />Controlled earthwork should be employed where surficial soils are present <br />below proposed footi ngs and floor sl abs. Refer to Tabl e I for the depths <br />of surficial soils encountered at the individual boring locations. Basal <br />soils will be discussed later. Controlled earthwork consists of excavating <br />the surficial soils from below and within the zone of influence of the pro- <br />posed building areas. The excavation is then backfilled with an engineered <br />fi 11 . <br /> <br />To provide resistance against lateral stress distribution, excavations and <br />fills should be oversized at a 1:1 ratio outward and downward beyond pro- <br />posed footings. Elevations of footings may be lowered to reduce the amount <br />of excavation and fill necessary to meet oversize requirements. <br /> <br />HUD Data Sheet 79G requires that a soil engineer be present to examine the <br />base of excavations prior to the placement of any fill below footings and <br />floor slabs. <br />