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2 . NON -TRAFFIC AND NON - CULTIVATED AREAS <br /> PIPE SIZE ( INCHES) DEPTH OF COVER* ( INCHES) <br /> 1 /2 11 - 11 /2 " 6" III <br /> 2 "-3 " 12" <br /> 6" AND LARGER 24" <br /> D . MAKE ALL PIPE JOINTS AND CONNECTIONS ACCORDING TO <br /> MANUFACTURER' S RECOMMENDATIONS , PERFORM ALL <br /> SOLVENT-WELD CONNECTIONS IN ACCORDANCE WITH ASTM D- <br /> 2855 . <br /> E . THRUST BLOCKS MUST BE FORMED AGAINST A SOLID , HAND- <br /> EXCAVATED TRENCH WALL UNDAMAGED BY MECHANICAL <br /> EQUIPMENT . THEY SHALL BE CONSTRUCTED OF CONCRETE , <br /> AND THE SPACE BETWEEN THE PIPE AND TRENCH SHALL BE <br /> FILLED TO THE HEIGHT OF THE OUTSIDE DIAMETER OF THE <br /> PIPE , <br /> F . AFTER INSTALLATION , BACKFILL AND COMPACT THE <br /> EXCAVATED SOIL TO MINIMIZE POST-CONSTRUCTION <br /> SETTLEMENT IN THE PIPE TRENCH . <br /> G . NATIVE EXCAVATED MATERIAL MAY BE USED TO BACKFILL THE <br /> PIPE TRENCH . HOWEVER , THE INITIAL BACKFILL MATERIAL <br /> SHALL BE FREE FROM ROCKS OR STONES LARGER THAN 1 - <br /> INCH IN DIAMETER . AT THE TIME OF PLACEMENT , THE <br /> MOISTURE CONTENT OF THE MATERIAL SHALL BE SUCH THAT <br /> THE REQUIRED DEGREE OF COMPACTION CAN BE OBTAINED <br /> WITH THE BACKFILL METHOD TO BE USED . THE INITIAL <br /> BACKFILL MATERIAL SHALL BE PLACED SO THAT THE PIPE WILL <br /> NOT BE DISPLACED , EXCESSIVELY DEFORMED , OR DAMAGED , <br /> THE INITIAL FILL SHALL BE COMPACTED FIRMLY AROUND AND <br /> ABOVE THE PIPE TO THE DENSITY SPECIFIED BY THE DESIGNER <br /> TO PROVIDE ADEQUATE LATERAL SUPPORT TO THE PIPE , IF <br /> THE WATER PACKING METHOD OF COMPACTION IS USED , FILL <br /> THE PIPELINE FIRST WITH WATER . THE INITIAL BACKFILL <br /> BEFORE WETTING SHALL BE OF SUFFICIENT DEPTH TO INSURE <br /> COMPLETE COVERAGE OF THE PIPE AFTER CONSOLIDATION . <br /> WATER PACKING IS ACCOMPLISHED BY ADDING ENOUGH <br /> WATER TO DICED LENGTHS OF THE TRENCH TO THOROUGHLY <br /> SATURATE THE INITIAL BACKFILL WITHOUT EXCESSIVE <br /> POOLING , AFTER THE BACKFILL IS SATURATED , THE PIPELINE <br /> SHALL REMAIN FULL OF WATER UNTIL AFTER THE FINAL <br /> BACKFILL IS MADE , THE WETTED FILL S-HALL BE ALLOWED TO <br /> DRY UNTIL FIRM BEFORE BEGINNING THE FINAL BACKFILL . <br /> H . THE TRENCH BOTTOM MUST BE UNIFORM, FREE OF DEBRIS , <br /> AND OF SUFFICIENT WIDTH TO PROPERLY PLACE PIPE AND <br /> SUPPORT IT OVER ITS ENTIRE LENGTH , BLOCKING OR <br /> F:\Engineering\Special Projects\Eagle Trace Phase 2\Contract Documents\Eagle Trace Subdivision Phase <br /> II\IRRIGATION SPECIFICATIONS from W. F . McCain .doc . 7 . <br />