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SAN. MIGUEL COUNTY ROAD DEPARTMENT <br />2007 GRADATION. SPECIFICATIONS <br />Base. Course - State Highway' Class 6 <br />Passing s/" Sieve 100% <br />Passing #4 Sieve . 30 _ 65% <br />Passing #8 Sieve 267-55%. <br />Passing #200 Sieve 3-12.%. <br />•