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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 mechan- <br />ical vibrators or impact tampers. Whee! rolling by a truck or backhoe shall not be <br />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 %2 sacks of portland cement per <br />cubic yard or CDF may be used. Excavated materials shall not be allowed for use <br />as 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- <br />flowing and excavatable material. CDF is a hardened, dense, non-settling fill that <br />requires 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. !f 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 />17 . 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 mini- <br />mum of ten (10) linear feet of curb and gutter shat! 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 />Utility & R/V1/ Permit Policy 17 06/01/97 <br />