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AMERICAN ENGINEERING TESTING, INC. AET Project No. 22-00012 <br /> pier should be installed at the foundation grade level. <br /> • All pier installation operations should be observed by the Geotechnical Engineer's <br /> representative, to reduce the potential for short pier elements and excessive aggregate lift <br /> thicknesses. <br /> If clay soils are used as fill to raise the building pad elevation prior to aggregate pier installation, <br /> you could consider"neat-cutting"the foundations to reduce backfilling. This technique involves <br /> cutting the foundation with a smooth edge backhoe bucket to the size of the footing, both pad <br /> and strip footings. With this method,there would be no forming of the footings, and the concrete <br /> would be placed"bank to bank"with the cut soil acting as the form. <br /> 6.3 Foundation Design <br /> After the site preparation described above,the buildings can be supported on conventional spread <br /> footing foundations bearing directly on naturally-occurring clay, on new engineered fill placed <br /> over naturally-occurring non-organic soils, or on aggregate pier improved soils. We recommend <br /> that perimeter foundations for heated building areas bear at a minimum depth of 42 inches below <br /> exterior grade for frost protection. Interior foundations in heated areas can be placed directly <br /> below the floor slab. The bottom of exterior foundations (those foundations not bordering heated <br /> building areas), including loading dock footings, should be extended to a minimum depth of 60 <br /> inches below exterior grade. <br /> Based on the conditions found in our borings, and our recommended grading/compaction <br /> procedures, it is our opinion that the footings can be proportioned for a maximum net allowable <br /> soil bearing capacity of 2,000 pounds per square foot (psf). With the aggregate pier alternative, <br /> we anticipate that the footings could be proportioned for a maximum net allowable soil bearing <br /> capacity of 3,000 psf. The final bearing pressure and settlement estimates for the aggregate pier <br /> alternative would be provided by the pier contractor after they perform on-site load tests of the <br /> piers. <br /> Page 15 of 28 <br />