SECTION 033000 - CAST-IN-PLACE CONCRETE

Sludge Treatment Project Engineered Container Retrieval and Transfer System December 2011
C. Compact soil materials to not less than the following percentages of maximum dry unit weight
according to ASTM D 1557:
1. Under structures, and pavements, compact top 12 inches of existing subgrade and each
layer of backfill or fill soil material at 92 percent.
2. Under building slabs, walkways and steps, compact top 12 inches of existing subgrade
and each layer of backfill or fill soil material at 95 percent.
3. Under unpaved areas, compact top six (6) inches below subgrade and compact each layer
of backfill or fill soil material at 85 percent.
4. For utility trenches not under structures or pavement, compact each layer of backfill soil
material at 85 percent.
3.13 GRADING
A. General: Uniformly grade areas to be free of irregular surface changes. Comply with
compaction requirements and grade to cross sections, lines, and elevations indicated.
B. Site Rough Grading: Slope grades to direct water away from buildings and to prevent
unintended ponding. Finish subgrades to required elevations within the following tolerances:
1. Unpaved Areas: Plus or minus one (1) inch.
2. Walks: Plus or minus 1/2 inch.
3. Pavements: Plus or minus 1/2 inch.
C. Grading inside Building Lines: Finish subgrade to a tolerance of 1/2 inch when tested with a 10
foot straightedge. Over excavation and trimming out excavations with gravel is anticipated.
3.14 BASE COURSES UNDER PAVEMENTS AND WALKS
A. Place base course on subgrades free of mud, frost, snow, or ice.
B. On prepared subgrade, place base course under pavements and walks as follows:
1. Shape base course to required crown elevations and cross-slope grades.
2. Place base course that exceeds six (6) inches in compacted thickness in layers of equal
thickness, with no compacted layer more than six (6) inches thick or less than three (3)
inches thick.
3. Compact imported subgrade and base course to not less than 95 percent of maximum dry
unit weight according to ASTM D1557. Material should be within two (2) percent of
optimum moisture content during compaction.
3.15 DRAINAGE COURSE UNDER CONCRETE SLABS-ON-GRADE
A. Place drainage course on subgrades free of mud, frost, snow, or ice.
B. On prepared subgrade, place and compact drainage course under cast-in-place concrete slabson-grade
as follows:
Contract 44577 KW Annex - Rev. D 44577-CSI-SPEC-001 312000 - 7