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1 <br /> 1 B. Select Backfill (SB): Materials shall be predominantly sand and gravel, having a plasticity <br /> 2 index less than 6. <br /> 3 <br /> 4 1. SB-1: Gradation as follows: <br /> 5 <br /> 6 Sieve Size Percent Passing <br /> 7 <br /> 8 No. 4 100 <br /> s No. 8 <br /> 55 - 85 <br /> 10 No. 40 15 - 30 <br /> 11 <br /> 12 2. SB-2: Gradation as follows: <br /> 13 <br /> 14 Sieve Size Percent Passing <br /> 15 <br /> 16 1/2-inch 100 <br /> 17 No. 4 50 - 80 <br /> 18 No. 40 10 - 25 <br /> 1s <br /> 20 3. SB-3: Gradation as follows: <br /> 21 <br /> 22 Sieve Size Percent Passing <br /> 23 <br /> za 3/4-inch 100 <br /> 25 3/8-inch 55 - 80 <br /> 26 No. 40 10 - 25 <br /> 27 <br /> 28 4. SB-4: Gradation as follows: <br /> 2s <br /> 30 Sieve Size Percent Passing <br /> 31 <br /> 32 1-1/2-inch 100 <br /> 33 1/2-inch 45 - 75 <br /> 34 No. 40 10 - 25 <br /> 35 <br /> 36 C. Backfill (BF): <br /> 37 <br /> 38 1. BF-1: Materials shall be predominantly sand and gravel, having a plasticity index less <br /> 39 than 6, and graded as follows: <br /> 40 <br /> 41 Sieve Size Percent Passing <br /> 42 <br /> 43 1-1/2-inch 100 <br /> 44 1/2-inch 45 - 75 <br /> 45 No. 40 10 - 25 <br /> 46 <br /> UTILITY TRENCHING & BACKFILLING <br /> 042894 02221-2 <br />