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PLACEMENT and COMPACTION OF ENGINEERED FILL <br />Unless otherwise superseded within the body of the Geotechnical Exploration Report, the following <br />criteria shall be utilized for placement of engineered fill on project. This includes, but is not limited to <br />earthen fill placement to improve site grades, fill placed below structural footings, fill placed interior of <br />structure, and fill placed as backfill of foundations. <br />Engineered fill placed for construction, if necessary should consist of natural, non-organic, competent <br />soils native to the project area. Such soils may include, but are not limited to gravel, sand, or clays with <br />Unified Soil Classification System (ASTM D2488) classifications of GW, SP, SM, CL or CH. Use of silt <br />or clayey silt as project fill will require additional review and approval of project Geotechnical Engineer <br />of Record. Such soils have USCS classifications of ML, MH, ML-CL, MH-CH. Use of topsoil, marl, <br />peat, other organic soils construction debris and/or other unsuitable materials as fill is not allowed. Such <br />soils have USCS classifications of OL, OH, Pt. <br />Engineered fill, classified as clay, should be tempered such that the moisture content at the time of <br />placement is equal to and no more than 3 percent above the optimum content for as defined by the <br />appropriate proctor test. Likewise, engineered fill classified as gravel or sand should be tempered such <br />that the moisture content at the time of placement is within 3 percent of the optimum content. <br />All engineered fill for construction should be placed in individual 8 inch maximum depth lifts. Each lift <br />of fill should be compacted by large vibratory equipment until the in-place soil density is equal to or <br />greater than the criteria established within the following tabulation. <br />Compaction Criteria <br />1 <br />(% respective Proctor) <br />Type of Construction Clay Sand or Gravel <br />Engineered Fill placed as Pavement Subgrade (more <br />Min. 95 Min. 95 <br />than 3 feet below bottom of final grade) <br />Engineered Fill placed as Pavement Subgrade (less <br />NA Min. 100 <br />than 3 feet below bottom of final grade) <br />Engineered Fill placed as Pavement Aggregate Base NA Min. 100 <br />Note 1 Unless otherwise required, compaction criteria shall be based on the Standard Proctor Test (ASTM <br />D698). <br />Density tests should be taken during engineered fill placement to document earthwork has achieved <br />necessary compaction of the material(s). <br />15 <br /> <br />