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Mr. Gary Gleason, P.E. 9 January 17, 2001 <br /> GME Project No. 9256 <br /> We recommend that an underdrain system be placed in all of the NFS sand <br /> subgrades, consisting of minimum 4 inch diameter continuous plastic pipe, <br /> slotted or perforated, and factory-wrapped in a geofabric sock. We <br /> recommend that these drain pipes be spaced no more than 20 feet <br /> on-center. They should be connected to one or more headers, and drained <br /> tp the stormwater pond located in the southeast corner of the site. The <br /> purpose of the drainage system is to remove water infiltrating into the <br /> free-draining NFS sand fill . <br /> In a11 footing excavations, we recommend that the contractor use a <br /> backhoe with a smooth edged bucket rather than a toothed bucket, to avoid <br /> tearing or ripping the bearing soiT . The sandy and clayey silt soils <br /> would be difficult to re-import . Each excavation base �areas should then <br /> be covered with a "mud mat" of 2 to 3 inches of lean concrete. The forms <br /> and reinforcing steel can be set on the "mud mat . " <br /> BuildinQ Foundations <br /> After the site has been prepared as described above, the building may be <br /> supported on conventional spread footing foundations. We recommend that <br /> the bottom of exterior footings for the heated building bear at least 4 <br /> feet below final outside grade for protection from frost penetration. <br /> The bottom of interior footings should typically bear about 18 to 24 <br /> -� <br /> OME CONdULTANTS,INC. <br />