have been placed. Materials that may be used to control grades include, but
are not limited to, sections of cardboard tubes or Styrofoam.
F. CONTRACTOR shall ensure that:
1. The geosynthetics remain intact during the installation of the overlying
soil;
2. No foreign material is mixed into the soil; and
3. No vehicles drive on the uncovered geosynthetics.
3.10 RIPRAP
A. Riprap shall be placed on top of a nonwoven geotextile.
B. Riprap shall be placed to its full thickness in one operation and in such a
manner as to avoid displacing the underlying material or damaging the
geotextile.
C. The larger stones shall be well distributed such that there are no large
accumulations of either the larger or smaller sizes of stone.
D. Adense riprap section, in which all sizes of material are placed in their proper
proportions, should be produced. Hand-placing or rearranging of individual
stones by mechanical equipment may be required to secure the results
specified.
E. Unless otherwise authorized by ENGINEER, riprap shall be placed in
conjunction with the dressing and preparation of the drainage channels.
CONTRACTOR shall not delay placement of riprap.
F. The edge of riprap areas shall be blended into existing slope contours.
3.11 PERFORATIONS
A.
Perforations in the compacted soil that must be filled shall include, but not be
limited to:
1. nuclear density test probe locations; and
2. test probes.
Perforations in the compacted soil shall be backfilled with similar soil and
compacted. The filled perforation shall be completed to the satisfaction of
ENGINEER.
File No. 3066.09 Earthwork 02200 - 12 of 14 December 2017
