12-28-2015 Council Packet - Laserfiche WebLink

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5. Dress complete embankment, backfill, or fill with allowance for topsoil, surfacing, or slope protection where applicable. B. Foundation Preparation: 1. Compact upper 12 inches of foundation soils to 100 percent of maximum dry unit weight as determined by ASTM D698. 2. Replace unsuitable foundation soils in accordance with Subparagraph 3.06.E.3. C. Backfill Around Structures: 1. Backfill to top of structures, unless otherwise shown, with free draining granular soil, less than 12 percent by weight passing a #200 sieve, in 6 -inch lifts. Compact each lift to minimum 95 percent of the Standard Proctor Density as determined by ASTM D698. 2. Fine grained soils are moisture sensitive and are often wet (water content exceeds the "optimum moisture content" defined by the Proctor test). In this case, the soils shall be scarified and dried to achieve suitable water content for compaction. D. For areas beneath unpaved roadways, place materials in accordance with MnDOT Spec. 2105.3.E, except as follows: 1. Upper 3 Feet of Roadbed: Maximum 8 inch thick loose lifts. Compact to minimum of 100 percent of maximum unit weight determined in accordance with ASTM D698 standard compactive effort. 2. Remainder of roadbed, maximum 12 inch thick lifts. Compact to minimum of 95 percent of maximum unit weight determined in accordance with ASTM D698 standard compactive effort. 3. Provide moisture control for compaction requirements. 4. All common material shall be used from on Site and be incidental to the Contract. E. Replace excavation carried below grade lines shown as follows: 1. Beneath Fill or Backfill: Same material as shown for overlying fill or backfill. 2. Permanent Cut Slopes (where overlying area is not to receive fill or backfill). Replace excavated material with Granular Borrow. 3. Beneath Footings and Base Slabs: a. Remove softer, fine and fill with clayey soils to retain foundation slab grades. Fill material shall be sandy lean clay or clayey sand compacted to: 1) 100 percent Standard Proctor Density (ASTM D698) required to attain grade for footings. 2) 100 percent Standard Proctor Density (ASTM D698) required to support floor slab only (outside the 1:1 oversized zone below footings). 4. Fill placed under floor slabs/foundations shall extend from planned edges of the foundations to a distance equal to at least 1 foot for each vertical foot of compacted fill required beneath the foundation at that location (1:1 oversize), refer to Drawings. 3.07 DISPOSITION OF EXCAVATED MATERIAL A. Conform to MnDOT Spec. 2105.3D, or as modified herein: 1. Strip topsoil consistent with Section 31 10 00. 2. No disposition of bituminous millings will be permitted. 3.08 PLACING EMBANKMENTS A. Conform to MnDOT Spec. 2105.3E, or as modified herein: 1. Topsoil placement shall conform to Section 32 92 00. EXCAVATION AND FILL © 2015 Stantec 1 19380XXXX 31 23 00 - 5