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GENERAL & SELECT FILL , FILTER MATERIAL , BACKFILL <br /> AND COMPACTION <br /> 1 ) SCOPE <br /> A) The Contractor shall furnish all of the material , equipment , plant, labor, transportation and <br /> supervision necessary so as to complete the Work as shown on the Plans and specified herein . <br /> 2) GENERAL <br /> A) Where structures or unsuitable material have been removed suitable backfill or fill material shall <br /> be provided , placed and compacted to elevate the site to the finish grade as shown on the <br /> grading plans . Pre-fill compaction shall be accomplished prior to this operation , as specified <br /> herein . <br /> 3) MATERIAL <br /> A) General Fill - All humus , peat ; spongy material , roots , stumps , muck , paving materials , and other <br /> objectionable materials shall be unsuitable for backfill . Suitable material for backfill shall consist <br /> of sandy-loam , ' clayey-sand , sand , gravel , soft shale , or crushed stone . The Engineer shall be <br /> the sole judge of what constitutes suitable and unsuitable material for backfill other than those <br /> materials listed above . <br /> B) Select Fill - Shall consist of uniform , clean , free draining sand , containing less than 3% fines <br /> passing a No . 200 sieve . Laboratory test results of this fill shall be submitted to the Engineer for <br /> his approval . <br /> C) Filter Material - Shall consist of a washed sand containing less than 1 % fines passing a No . 200 <br /> sieve and must have a uniformity coefficient of 1 . 5 or greater but not more than 4 . 0 . Effective <br /> grain size shall be been 0 . 20 and 0 . 55 millimeters diameter. <br /> 4 ) BORROW <br /> A) If there . is not sufficient excavated material of a suitable quality to complete the work , the <br /> Contractor shall provide and deliver the necessary suitable additional material to the job site . <br /> 5) UNSUITABLE MATERIAL REPLACEMENT <br /> A) Fill material shall be placed and spread evenly in layers not to exceed eight inches before <br /> compaction . All fill material shall be free from vegetable matter, wood , and other deleterious <br /> substances , and shall not contain rocks or clods having a diameter of more than three inches . <br /> B) If soil cement paving is proposed , local yellow sand or hard pan shall not be used for the <br /> subgrade nor in the base . <br /> 6) PRE -FILL COMPACTION <br /> A) Should the pre-fill surface elevation be below that required for the base of proposed building <br /> foundations or paving subgrade , the areas within road rights-of-way , under parking areas , and the <br /> areas under and within five feet of proposed buildings shall be precompacted . This <br /> precompaction shall be performed equally on existing ground and on surfaces which have been <br /> excavated to remove unsuitable material . The top one foot of said areas shall be compacted to a <br /> minimum density of 95 % of maximum as determined by AASHTO T- 180 . The maximum spacing <br /> between density tests shall be 150 feet. <br /> 7 ) COMPACTION <br /> A) Backfill material shall be compacted to 95 % of maximum density per AASHTO T- 180 . Equipment <br /> suitable and adequate for uniform compaction to the specified density shall be used for backfill <br /> SW-3- 1 <br />