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_ Paul Madson and <br /> Associates, Ltd. <br /> • Project BABX-92-813 <br /> � January 6, 1993 <br /> Page 4 <br /> be at least 2 1/2 feet square. We estimate total and differential settlement of the foundations <br /> will be less than 1!2 inch under this loading. <br /> We recommend the perimeter footings bear a minimum of 3 1/2 feet below exterior grade for <br /> frost protection. Interior footings may be placed immediately beneath the floor slab, unless <br /> construction is to take place during the winter. During winter construction, we recommend all <br /> footings be placed a minimum of 3 1/2 feet below grade for frost protection. <br /> C.4 Floor Slabs <br /> Prior to placement of the floor slab, we recommend the removal of all topsoil from within the <br /> building footprint. To provide a capillary moisture break and reduce the floor slab dampness, <br /> we recommend the upper 6 inches of fill below the floor slab consist of a clean sand with less <br /> than 10 percent of the soil by weight passing the number 200 sieve. If an impermeable floor <br /> covering, a hardened concrete finish or sealer will be used, we also recommend a moisture <br /> vapor barrier be installed under the sand cushion. <br /> C.5 Site Grading and Drainage <br /> We recommend landscaped areas around the house be sloped a minimum of 6 inches within <br /> 10 feet of the house and slabs be sloped to permit drainage away from the house. If site grades <br /> are raised and a basement is constructed, we recommend the basement walls be dampproofed <br /> and an exterior drain tile system be installed. Collected seepage should be routed to a sump to <br /> be drained. <br /> D. Construction <br /> D.1 Excavation <br /> It is our opinion the majority of the soils encountererl in the borings can be excavated with a <br /> backhoe. However, because footing grade will be fairly close to the water levels in the <br /> wetlands, areas of water may be encountered during excavation. This water will likely be <br /> controllable with sump pumps. If the bottom of the footing excavation becomes soft prior to <br /> placing concrete, we recommend the footing trenches be subcut an additional 1 foot and <br />