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8. Unless otherwise approved, pavement cuts shall be made parallel or perpendicular <br /> to the centerline of the public way. <br /> 9. Trench backfill within the public way shall be compacted to a minimum of 95% <br /> Relative Maximum Density as determined by AASHTO T99, method D as corrected <br /> for oversize by AASHTO T-224. Compaction shall be accomplished using <br /> mechanical vibrators or impact tampers. Wheel rolling by a truck or backhoe shall <br /> not be acceptable. <br /> Within streets, alleys and sidewalks trench backfill shall consist of 3/4"-0 Crushed <br /> Base Aggregate or, with prior approval, controlled density fill. Pea gravel shall not <br /> be allowed as an option. <br /> In trenches crossing a street or alley right-of--way at right angles to the alignment, <br /> cement-added aggregate with a minimum of 1 '/z sacks of portland cement per cubic <br /> yard or CDF may be used. Excavated materials shall not be allowed for use as <br /> trench backfill except in unimproved portions of the public way. <br /> Controlled density fill (CDF), also known as flowable backfill, is a cementious <br /> material mixed, transported, and delivered using normal ready mixed concrete <br /> operations. CDF is a mixture of cement, aggregates, water, and admixtures such <br /> as fly ash proportioned to provide anon-segregating, self consolidating, free-flowing <br /> and excavatable material. CDF is a hardened, dense, non-settling fill that requires <br /> no compaction effort. <br /> Traffic may temporarily be placed directly upon CDF prior to paving as soon as it <br /> has sufficiently hardened so that the surface will withstand traffic or construction <br /> equipment loading without deformation. If CDF is used as a temporary surface <br /> restoration material, the surface shall be maintained and repaired due to damage <br /> by traffic. <br /> 10. All portland cement concrete used in the replacement of streets, alleys or sidewalks <br /> shall obtain a minimum breaking strength of 3,300 psi in 28 days and conform to <br /> sections 212 through 215 of the Standard Specifications. <br /> 11. All ornamental surfacing shall be replaced "in-kind" to that surfacing removed. <br /> 12. Where sections of sidewalk are requested to be removed by the permittee, they <br /> shall be removed to the nearest existing score or joint in each direction. <br /> 13. Where sections of curb or curb and gutter are removed by the permittee, a minimum <br /> of ten (10) linear feet of curb and gutter shall be removed and replaced. An <br /> alternative to this requirement shall be removing and replacing three (3) linear feet <br /> of curb and gutter with the new curb and gutter tied into the existing curb by <br /> inserting 6"X #4 rebar dowels into drilled one-half inch diameter by three (3) inch <br /> deep holes in the adjoining existing curbs and gutters, one dowel in the curb and <br /> two dowels in the gutter at each end of the replaced section. <br /> <br /> Utility & R/W Permit Policy 18 02/09/98 <br /> <br />