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G _DEC 1 8 199a <br />Lo <br />0 <br />0 <br />BACKFILL <br />SEE STD DWG 610 <br />12` <br />MIN <br />I <br />PIPE ZONE <br />SEE STD DWG 611 <br />{ M{N <br />FOUNDATION MATERIAL i <br />AS REOUIRED I <br />SEE STD DWG 611 I <br />mcc;c�7ro L------ <br />SECTION <br />121n�ol <br />I. ALL BACKFILL MATERIAL SHALL BE PLACED <br />IN LIFTS NOT TO EXCEED 12 INCHES BEFCRE <br />COMPACTION UNLESS AUTHORIZED BY THE <br />ENGINEER DUE TO THE CHARACTER OF THE <br />MATERIAL AND THE COMPACTING EQUIPMENT. <br />2. MECHANICAL COMPACTION OF BACKFILL MATERIAL <br />SHALL NOT BEGIN UNTIL THE DEPTH OF <br />COMPACTED BACKFILL MATERIAL IS 2 FEET <br />ABOVE THE TOP OF PIPE. <br />3. EACH LIFT SHALL BE MECHANICALLY <br />COMPACTED TO THE REOUIRED DENSITY PRIOR <br />TO PLACING SUCCEEDING LIFTS OF BACKFILL <br />MATERIAL. <br />I TOP 3' <br />MIN COMPACTION <br />95%•MAX DENSITY <br />MIN COMPACTION <br />90% MAX DENSITY <br />ION <br />90% MAX DENSITY <br />ION <br />90% MAX DENSITY <br />1 <br />4. COMPAC-ICN TESTS SHALL BE AS REQUIRED BY <br />THE C17Y ENGINEER, BUT. IN NO CASE LESS <br />THAN 2 TESTS EVERY 200 FEET OF TRENCH <br />(ONE AT SUBGRADE AND ONE AT 50% OF TRENCH <br />DEPTH) <br />5.IN-PLACE DENSITY WILL BE DETERMINED BY ONE <br />OR MOTE OF THE FOLLOWING METHODS. <br />(A) ASTM D1556, TEST FOR DENSITY OF SOIL <br />IN -PLACE BY THE SAND CONE METHOD. <br />(B) ASTM 02167 - (RUBBER BALLOON METHOD) <br />(C) ASTM D2922 - (NUCLEAR METHOD) <br />6.LABORATORY DENSITY WILL BE DETERMINED BY <br />ASTM �698, MOISTURE -DENSITY RELATIONS OF <br />SOILS AND S01L-AGGREGA7E MIXTURES. <br />TYPICAL TRENCH COMPACTION 12-16-91 I 615 <br />date number <br />CITY OF EVERETT — PUBLIC WORKS DEPARTMENT <br />Inaoil--iv-p <br />