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~8 <br />grange County Trigon Project No 036-00-016D <br />Hillsborough Landfill Site _ July 19, 2000 <br />considered for the site, Trigon could assist the design team with developing the most practical <br />and cost-effective design and construction options for development. <br />Excavation and Grading <br />Excavation at the project site could encounter refuse and debris that may require off-site disposal <br />at a permitted landfill. To avoid this situation, it is recommended that planned grades be based <br />on raising the site with structural fill and supporting new construction on, or in the new structural <br />fill. The new fill will also serve as a positive barrier to minimize exposure to any of the existing <br />refuse and rubble fill materials, <br />LiPhtly Loaded Structures <br />In our opinion, lightly loaded structures could be supported on shallow depth mat foundations <br />designed to spread the structural loads over a large area, thereby significantly reducing the <br />bearing pressures that could be transmitted into the existing FILL soils. Provided the mat is <br />designed to be a structurally rigid member, it is anticipated that the movement caused by <br />settlement could be tolerated without resulting in structural failure. <br />Moderate to Heavily Loaded Structures <br />Although the existing FILL soils generally appear to be firm to stiff, the magnitude of settlement <br />under moderately to heavily loaded foundations cannot be estimated within reasonable design <br />tolerances. Furthermore, the refuse encormtered in several borings is unsuitable for support of <br />most structures for the same reason, and is likely to exist in localized to widespread deposits <br />throughout the site. <br />Moderate to heavily loaded structures would require the use of foundations extending into the <br />natural undisturbed soils underlying the existing FILL soils. The most common foundation <br />options would include: <br />I) Shallow depth spread foundations. However, this option would require removing the <br />existing FILL soils and replacing with a controlled structural fill to support the spread <br />foundations, <br />T/UGGN ENGINEERING CGN$UITiiNr$ INC. _ Page 6 <br />