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.- <br />Siz_ <br />in MM <br />n. Burial <br />Depth <br />Condition.O <br />in I mm <br />Min. <br />in mm <br />Unpaved <br />18 <br />432 <br />12 <br />305 <br />Paved, min. 4" (100 mm) asphalt <br />12 <br />305 <br />8 <br />203 <br />2 <br />50 <br />Paved, min. 4" (140 mm) concrete <br />9 <br />229 <br />5 <br />127 <br />Paved, min. 6" (150 mm) concrete <br />9 <br />229 <br />3 <br />76 <br />Unpaved <br />20 <br />508 <br />14 <br />356 <br />3 <br />75 <br />Paved, min. 4" (100 mm) asphalt <br />13 <br />330 <br />9 <br />229 <br />Paved, min. 4" (100 mm) concrete <br />11 <br />279 <br />7 <br />178 <br />Paved, min. 6" (150 mm) concrete <br />10 <br />254 <br />4 <br />102 <br />Unpaved <br />20 <br />508 <br />14 <br />356 <br />4 <br />100 <br />Paved, min. 4" (100 mm) asphalt <br />14 <br />356 <br />10 <br />254 <br />Paved, min. 4" (100 mm) concrete <br />11 <br />279 <br />7 <br />178 <br />Paved, min. 6" (150 mm) concrete <br />10 <br />254 <br />4 <br />102 <br />Unpaved <br />36 <br />914 <br />14 <br />356 <br />6 <br />150 <br />Paved, min. 4" (100 mm) asphalt <br />24 <br />610 <br />10 <br />254 <br />Paved, min. 4" (100 mm) concrete <br />20 <br />508 <br />7 <br />178 <br />Paved, min. 6" (150 mm) concrete <br />16 <br />406 <br />4 <br />102 <br />a <br />n <br />51 <br />z <br />