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OLD RIVER GOLF COURSE Page No. 4 VI DESIGN STUDIES AND RECOMMENDATIONS From a soil engineering standpoint, it is our opinion that the site is suitable for construction of the proposed building, however, all of the conclusions and recommendations presented in this report should be incorporated in design and construction to avoid soil and foundation problems. The site is also suitable for _ installation of leach lines, however, a minimum of 1. 0 foot of fill will be required in the leach field area so that the bottom of the leach lines are at least 3 .0 feet above the estimated average ground water elevation of 5 .0 feet. The surface clay soil in the area of the proposed building pad is mildly expansive and subject to slight volume change with variations in moisture content. On site clay soils should be placed, compacted, and maintained in a moist condition until construction of the foundations and slab is complete. In order to provide a suitable building pad, the proposed building pad site should be cleared of any organic surface growth. The remaining loose soils should be removed and stockpiled for reuse. The depth of the loose soils may best be determined in the field but it is anticipated that it will be less than 1.0 foot. The subgrade thus exposed should be scarified and recompacted as _ recommended in Appendix A, Engineered Fill Specifications. If the subgrade consists of clay soils, the following modifications should be made to the specifications: All on site clay soil that is either scarified and recompacted or that is utilized for fill shall be compacted at a moisture content that is at least 3 percent over optimum moisture content. The value of this moisture content shall be furnished to the grading contractor by the soil engineer. The required density of the top 18 inches of the building pad shall be between 85 and 90 percent, but in no instance should exceed 90 percent. If compaction is in excess of 90 percent or the required minimum moisture content has not been achieved, the fill or recompacted subgrade will be considered unacceptable and reworking of the fill or subgrade shall be required. The required density for fill below the top 18 inches is 90 percent. After the subgrade has been compacted, fill may then be placed _ on the building pad. All fill should be placed as engineered fill as recommended in Appendix A. If on site non-clay or cohesionless soil is available, it should be utilized for fill. If on site clay pERSpY s z r — o � �ssoc�