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20-01 Variolite Street Reconstruction Ramsey, Minnesota NTI Project No. 19. MSP09109.000 PLACEMENT AND COMPACTION OF ENGINEERED FILL Unless otherwise superseded within the body of the Geotechnical Exploration Report, the following criteria shall be utilized for placement of engineered fill on project. This includes, but is not limited to earthen fill placement to improve site grades, fill placed below structural footings, fill placed interior of structure, and fill placed as backfill of foundations. Engineered fill placed for construction, if necessary should consist of natural, non -organic, competent soils native to the project area. Such soils may include, but are not limited to gravel, sand, or clays with Unified Soil Classification System (ASTM D2488) classifications of GW, SP, SM, CL or CH. Use of silt or clayey silt as project fill will require additional review and approval of project Geotechnical Engineer of Record. Such soils have USCS classifications of ML, MH, ML-CL, MH-CH. Use of topsoil, marl, peat, other organic soils construction debris and/or other unsuitable materials as fill is not allowed. Such soils have USCS classifications of OL, OH, Pt. Engineered fill, classified as clay, should be tempered such that the moisture content at the time of placement is equal to and no more than 3 percent above the optimum content for as defined by the appropriate proctor test. Likewise, engineered fill classified as gravel or sand should be tempered such that the moisture content at the time of placement is within 3 percent of the optimum content. All engineered fill for construction should be placed in individual 8 inch maximum depth lifts. Each lift of fill should be compacted by large vibratory equipment until the in -place soil density is equal to or greater than the criteria established within the following tabulation. Compaction Criteria (% respective Proctor) 1 Type of Construction Clay Sand or Gravel Engineered Fill placed as Pavement Subgrade (more than 3 feet below bottom of final grade) Min. 95 Min. 95 Engineered Fill placed as Pavement Subgrade (less than 3 feet below bottom of final grade) Min. 100 Min. 100 Engineered Fill placed as Pavement Aggregate Base NA Min. 100 Note 1 Unless otherwise required, compaction criteria shall be based on the Standard Proctor Test (ASTM D698). Density tests should be taken during engineered fill placement to document earthwork has achieved necessary compaction of the material(s).