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� <br /> E Cohesive and other materials with over 20 percent fines assin #200 sieve must be <br /> p 9 compacted m <br /> lifts 6 to 8 inches thick using a sheepsfoot, vibratory roller, or pneumatic tire roller making several <br /> fpasses. Cohesionless structural fill must be placed in compacted lifts 10 to 12 inches thick using <br /> smooth vibrarollers making several passes. Use a power tamper or vibro-plate compactor to <br /> I place structural fill in confined areas with loase lifts up to 4 inches thick compacted by making <br /> several passes. Water content of structural fill must be controlled and maintained between 2 <br /> - percent dryer and 1 percent wetter than optimum water content as evaluated by Standard Proctor <br /> Imethod (ASTM: D698). Compaction of structural fill must meet recommendations in TABLE C. <br /> TABLE C COMPACTION REQUIREMENTS FOR STRUCTURAL FILL <br /> I , . Relative Density <br /> Standard Proctor Standard Proctor ASTM D4253 <br /> I Construction Applications ASTM D698 ASTM D698 ASTM D4254 <br /> Cohesive soi! Cohesionless soil Cohesionless soil <br /> (lean clay) (sand and gravel) (sand and gravel) <br /> (%) (%) (%) <br /> • Foundations for buildings and � � � <br /> other structures ; 95 ; 98 ' <br /> � Roadway subgrades ; : ; 75 <br /> • Critical backflll areas � � i <br /> � � c <br /> -•--�-��-----�----�----•�-�-------------------------.._--•-----•--'--------•-----�-- ' � <br /> • --�-----�---------------------------___.._.._--•-----------------••--------•--•-�--.._..-- <br /> � , ; <br /> • Minor surface subsidence is ; ; � <br /> possible and allowable � ; ; <br /> • Backfill adjacent to structures � � ; <br /> that do not support other ; ; � � <br /> structures � 90 � 93 � 45 <br /> • Backfill will not support other � � ; <br /> structures and buildings ; � � <br /> • Backfill for pipe or utility � � � <br /> trenches � • ' <br /> � ; <br /> '. � ; <br /> --------�•-----------•-•--•---_..-----•-•---.__..-----•--------��-•-------------•-----•------ : . <br /> Backfill in non-critical areas � ?-----------..___�.__._._..__�.._..___..----___..----••-•--••----- <br /> . � <br /> where moderate surtace ; 85 ; 88 � <br /> subsidence is possible and � � � 20 <br /> allowable ; � � <br /> � ; <br /> Note (A) Use relative density technique (ASTM D4253 and D4254) where Standard Proctor (ASTM D 698) <br /> cu►ve does not have a clear peak at maximum dry soil density and optimum water content. <br /> Before compaction, structural fill material should be mixed thoroughly to make its water content <br /> uniform and within optimum water content range. If this material's water content is excessively wet <br /> and above this range, this material should be dried. Aerate this wetter material by spreading it out <br /> or scarifying it to make it suitable as structural fill meeting this range. Blending this wetter material <br /> with drier material to make suitable structural fill meeting this range may be considered. If <br /> Allied Project 05039 9 July 31, 2005 <br />