9910 EVERGREEN WAY SPRINT ANTENNA 2018-01-01 MF Import

� � • LSI Adapt Materials: Structural fill includes any fill materials placed under footings, pavements, dri��eways, and other such structures. T37�ica] materials used for structural fill include: clean, well-graded sand and gravel (pit-run); dea^ sand; crushed rock; controlled-density fill (CDF); lean-mix concrete; and various soil mixtures of silt, .. nd, and gravel. Recycled concrete, asphalt, and glass, derived from pulverized parent materials may also be used as structural fill. Placement and Comnaction: Generally, CDF, and lean-mix concrete do not require special placement and compaction procedures. In contrast, pit-run, s�nd, crushed rock, soil mixtures, and recycled materials should be placed in horizontal lifts not exceeding 8 inches in loose thickness, and each lifr should be thoroughly compacted with a mechanical compactor. Using the modified Proctor maximum dry densiry (ASTM: D-1557) as a standard, we recommend that structural fill used for various on-site applications be compacted to the following minimum densities: Fill Aaplication Slab/Footing subgrade Gravel drive subgrade (upper 1 Sooi) Gravel drive subgrade (below 1 fool) Minimum Comoaction 90 percent 95 percent 90 percent Suberades and Testinc: Regardless of location or material, all structu�al fill should be placed uver firm, unyielding subgrade soils. We recommend that a representative from Adapt be retained to observe the condition of subgrade soils before fill placement begins, and to pedorm a series of in-place density tests during soil fill placement. In this way, the adequacy of soil compaction efforts may Ue evaluated as earthwork progresses. Fill Content: Soils used for structunl fill should not contain individual particles greater than about 6 inches in diameter and should be free of organics, debris, and other deleterious materials. Given these prerequisites, [he suitability of soils used for sWcmral fill depends primarily on the grain-size distribution and moisture content of the soils when they are placed. When the "fines" content (that soil fraction passing the U.S. No. 200 Sieve) increases, soils become more sensitive to small changes in moisture content. Soils containing more than about 5 percent fines (by weight) cannot be consisiently compacted to a firm, unyieldino condition when the moismre content is more than about 2 percentage points above optimum. The near-surface soils al this site below the topsoil consist of silt}• sands witi� organics and should be considered extremely moisture sensitive. The use of "clean" soil is necessary for fill placement during wet-weather site work, or if the in-situ moisture content of the site soils is too high to allow adequate compaction. Clean soils are defined as granular soils thai have a fines content of less than 5 percent (by weight) based on the soil fractiompassing the U.S. No.3/4-inch Sieve. CLOSURG Sprinl PCS Augusi 4, 2003 �� Adapt Projea No. WA03-9720 Page 9 ��