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<br /> <br />TABLE 2-1 <br />DRAIN COVER FILL <br />GRADATION SPECIFICATION <br /> <br />_ 1!/z-inch 100 <br />%-inch ? 70 -100 <br />No. 4 5-50 <br />No. 200 0-8 <br /> <br />r <br />r <br />z maoama.oao. Golder Associates