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<br />. <br /> <br />. <br /> <br />. <br /> <br />Colorado Project No. NH 0504-042 <br />SH 50 at Rocky Ford <br />Construction Subaccount No. 1356] <br /> <br />7/2/01 <br /> <br />REVISION OF SECTION 206 <br />STRUCTURE BAcKFlLL <br /> <br />Section 206 of the Standard Specifications is hereby revised for this project as follows: <br /> <br />Subsection 206.02(a} shall include the following: <br /> <br />At the Contractor's option Structure Backfill (Special) meeting the following gradation requirements may be <br />substituted for Structure Backfill (Class I) or (Class 2) for backfilling culvert pipes, sewer pipes, and minor inlet <br />structures, but not the bridge: <br /> <br />Sieve Desi~nation <br />9.5 mm (3/8 inch) <br />4.75 mm (No.4) <br />2.36 mm (No.8) <br />1.18mm(No.16) <br />300 :m (No. 50) <br />75 :m (No. 200) <br /> <br />% By Weight <br />Passing Square Mile Sieves <br />100 <br />60-90 <br />0-45 <br />0-25 <br />0.6 <br />0.2 <br /> <br />Subsection 206.03 shall include the following: <br /> <br />Compaction of Structure Backfill will not be required if Structure Backfill (Special) is used. <br /> <br />The Contractor may substitute Structure Backfill (Special) for the required embankment material in trench <br />backfilling operations; however, the top I foot shall be the required embankment material. <br /> <br />7 <br />