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Veco Design Studio <br />June 3, 2024 <br />Project 10112-04 <br />Page 7 <br /> <br />b) The existing subgrade soils below the slab-on-grade are anticipated <br />to be disturbed during the demolition process and should be <br />reworked for a depth of 6 to 8 inches, subject to review during the <br />construction. <br /> <br />c) Wherever structural fills, if any, are to be placed, the upper 6 to 8 <br />inches of the exposed subgrade should be scarified and reworked. <br /> <br />d) Any loosening of reworked or native material, consequent to the <br />passage of construction traffic, weathering, etc., should be made <br />good prior to further construction. <br /> <br />e) The depths of overexcavation, if any, should be reviewed by the <br />Geotechnical Engineer during construction. Any surface or <br />subsurface obstructions, or any variation of site materials or <br />conditions encountered during grading should be brought <br />immediately to the attention of the Geotechnical Engineer for <br />proper exposure, removal or processing, as directed. <br /> <br />f) No underground obstructions or facilities should remain in any <br />structural areas. Depressions and/or cavities created as a result of <br />the removal of obstructions should be backfilled properly with <br />suitable materials, and compacted. <br /> <br />5.2.2 Material Selection (for any new fills) <br /> <br />After the site has been stripped of any debris, excavated on-site soils are <br />considered satisfactory for reuse in the construction of on-site fills. <br />Concrete pieces greater than 4 inches in diameter should not be <br />incorporated in compacted fill below slab-on-grade. <br /> <br />5.2.3 Compaction Requirements <br /> <br />a) Reworking/compaction shall include moisture-conditioning/drying <br />as needed to bring the soils too slightly above the optimum <br />moisture content. All reworked soils and structural fills should be <br />densified to achieve at least 90 percent relative compaction with <br />reference to laboratory compaction standard. <br /> <br />b) The optimum moisture content and maximum dry density should <br />be determined in the laboratory in accordance with ASTM Test <br />Designation D1557. <br /> <br />c) Fill should be compacted in lifts not exceeding 8 inches (loose). <br /> <br />