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. I <br /> 10-1. UNDERDRAIN <br /> Clean Imported #3 sand_ underdraiiis shall conform to the provisions in Section <br /> 68-1.025,"Underdrains,"of the Standard Specifications and these special provisions. <br />' Material shall meet the following gradation requirements <br /> U S Sieve %Passim <br /> #6 (3.35mm) 100 <br /> 48 (2.36mm) 99+/- 1 <br /> #12(1.70mm) 59+/- 12 <br /> #16(1.18rnm) 9+/-5 <br /> #20(850um) 2+/- 1 <br /> #30(600 um) <br /> 9.5 nu-n(0.374")Pea gavel shall conform to these special provisions <br /> Material shall meet the following gradation requirements <br /> U.S Sieve %Passing <br /> '/a" (6.35mm) 100 <br /> #4 (4.75mm) 98+/-2 <br /> #6(1.70mm) 76+/-10 <br /> #8(1.18mm) 21+/-10 <br /> #12(850um) <br />