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Size (mm) Sieve % Passing <br />_ . 9.52 3/8" 100% <br />4.76 #4 95 - 100% <br />2.38 #8 75 - 100% <br />1.19 #16 50 - 85% <br />- 0.590 #30 25 - 60% <br />0.297 #50 10 - 30% <br />0.149 #100 2 - 10% <br />- 0.074 #200 less than 4% <br />This gradation is a composite of ASTM C-33 and USBR Concrete <br />__ Manual and represents a concrete sand as tested by AASHTO T27. <br />2. Atterberg Limits shall comply with the following criteria: <br />Liquid Limits: Less than 5% <br />Plasticity lndex: Less than 2% <br />- D. Type 4 Material ' <br />The Contractor may be able to use on-site materials from the area near the <br />_ river to obtain this materiel. He should be cognizant of the fact that most <br />on-site material used for Type 4 material will require screening to obtain <br />proper gradations. All Type 4 materiel shall conform to the following <br />criteria: <br />__ ~ - 1. Gradation shall conform to the following: <br />- Size (mm) Sieve % Passing <br />38.1 1-1/2" 100% <br />19.1 3/4" 55 - 15% <br />9.52 3/8" 25 - 45% <br />4.76 #4 10 - 25% <br />2.38 #8 0 - 10% <br />1.19 #16 0% <br />This test is performed in accordance with AASHTO T27. <br />2.04 Structural Bedding Material <br />The foundation of all structures except those structures within or adjacent to pond <br />embankments shall be excavated a minimum of 12 inches and backfilled with t-1/2 <br />inched washed rock. The material shall be placed to form a uniform compacted <br />gravel mat. The foundations of structures within pond embankments (such as outlet <br />towers) shall be prepared by overexeavating a minimum of 2 feet and backfilling <br />the overexcavated zone with Type 1 or Type 2 material compacted to 100% of <br />ASTM D-698 Standard Proctor Density. Backfilling of areas beneath foundations <br />shall be accomplished in uniform l.fts of approximately 6 to 8 inches and shall be <br />compacted at plus or minus 3% of optimum moisture content. <br />• <br />02200-4 <br />