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opinion of the Engineer , is not suitable for reuse shall be <br /> disposed of at a location and in a manner satisfactory to <br /> the Engineer at the Contractor ' s expense. <br /> 2. 03 BEDDING AND BACKFILL <br /> A. All backfill material shall be approved before use and be <br /> free of organic debris and other deleterious items. <br /> B. Bedding and initial backfill : Materials shall be <br /> predominantly sand and gravel, having a plasticity index <br /> less than 6 . Gradation as follows : <br /> Sieve Size Percent Passing <br /> 3/4 inch 100 <br /> 3/8 inch 55-80 <br /> No. 40 10-25 <br /> C. Top backfill: Native material clear of all debris. <br /> 2. 04 AGGREGATE BASE <br /> Material shall meet all requirements of Class 2 aggregate <br /> base as specified in Caltrans Standard Specifications <br /> Section 26-1. 02B for 3/4" maximum particle size. <br /> 2. 05 GRAVEL : Gravel specified on the drawings for structural <br /> drain rock shall conform to gradation requirements set forth <br /> in Caltrans Standard Specification, Class 1, Type B. <br /> PART 3 : EXECUTION <br /> 3 . 01 GENERAL <br /> A. Neither the elevation of the bottom of any completed <br /> excavation nor the top layer of compacted fill material <br /> shall vary more than 0 . 2 foot from the elevation indicated <br /> on the Drawings. <br /> 3 . 02 STRUCTURE EXCAVATION <br /> Excavation shall be made to the limits and dimensions shown <br /> on the drawings , and if not shown , to such widths as will <br /> give suitable room for construction of the structures , for <br /> bracing and supporting , pumping , and draining. The bottom of <br /> the excavations shall be rendered firm and dry and in all <br /> respects acceptable to the Engineer . <br /> 3 . 03 EXCAVATION FOR EMBANKMENT <br /> EARTHWORK <br /> 02200-4 <br />