The permittee shall promptly refill any trenches or openings made with approved fill
material in layers not to exceed six (6) inches in thickness, thoroughly tamping each
layer with metal tampers having a tamping face of not more than twenty-five (25) square
inches or machine compacted. The backfill materials shall be in optimum moisture content
and shall be compacted within a tolerance of plus or minus twenty (20) percent as
compared to the theoretical maximum density determined in accordance with Virginia
Test Method I. On unimproved areas of the right-of-way, this process shall continue
until such trench or opening is filled level with the adjoining surface, leaving the
same smooth and ready to receive sod or seed. On improved areas of the right-of-way
of primary streets, this process shall continue to within fifteen (15) inches of the
surface grade where crusher run stone shall be used to complete the compaction process
level with the adjoining surface, leaving the same smooth and safe for travel. On
all other streets, the same shall apply, except that twelve (12) inches of crusher
run stone shall be used. The designation of primary street shall be made by the director
of engineering. Patching and repair of all streets shall be in accordance with city
standards and as designated in the permit.
Tunnels will be backfilled evenly and fully so that the density of the fill will not
be equal to that of the surrounding surfaces. Broken pavement, large stones, roots
and other debris shall not be used in the backfill.
(Ord. No. 3051-83; Ord. No. 3111-83, § 1; Ord. No. 3223-84)
