SHI Builders West Orange NJ Prelim GI SWM Report 1

Frost Coverage Embedment Depth: Footings subject to frost action should be placed at least 36 inches below adjacent exterior grades or as required by the local building code to provide protection from frost penetration. If applicable, interior footings not subject to frost action (including during the period of construction) may be placed at a minimum depth of 18 inches below the slab subgrade. 5.3 Preliminary Floor Slab Recommendations Dynamic Earth anticipates that approved structural fill placed and/or on-site soils will be suitable for support of the proposed floor slabs provided these materials are properly evaluated, compacted and proofrolled in accordance with Sections 5.2 and 5.3 of this report. Due to the existing fill and moisture sensitive on-site soils encountered, the contractor should anticipate at least partial overexcavation and replacement and/or subgrade stabilization within the area of proposed floor slab. Depending on construction phase evaluation, overexcavation may be limited with the use of subgrade stabilization techniques, such as geogrid stabilization, as directed by Dynamic Earth. Any areas of the slab that become softened or disturbed as a result of wetting and/or repeated exposure to construction traffic should be removed and replaced with compacted structural fill. The properly prepared on-site soils are preliminarily expected to yield a minimum subgrade modulus (k) of 125 psi/in. A minimum four-inch layer of stone should be installed below the floor slabs to provide a capillary break. A vapor barrier beneath the floor slab is recommended. Total and post-construction settlements of floor slabs installed in accordance with the recommendations outlined in this report are estimated to be less than one-quarter inch. 5.4 Preliminary Earthwork Considerations Demolition and Surface Cover Stripping: Prior to the start of construction, all utilities should be identified and secured. If encountered, existing structural elements, such as concrete foundations, slabs, and remnant basement walls, should be removed entirely from below proposed foundations and slabs and excavated to at least two feet below pavement subgrades. Remnant structural elements may remain in-place below these depths below pavements provided they do not interfere with future construction. Any slabs left in-place should be thoroughly fractured to promote

nt structural elements may remain in-place below these depths below pavements provided they do not interfere with future construction. Any slabs left in-place should be thoroughly fractured to promote vertical drainage in the presence of a qualified Geotechnical Engineer and should be backfilled with structural fill in accordance with the recommendations included herein. The surface cover materials, including vegetation and topsoil, should be removed from within, and at least five feet beyond, the limits of the proposed building and new pavement areas as well as any other area which will require fill placement. If required, removal of any trees should include root mats and tree stumps. As evident by the soil profile pits performed, relatively deeper root mats should be anticipated. The contractor is responsible for restoring grades with structural fill SHI Builders 10 4266-99-001E