20170276 Ver 1_Details_20170413

6. For all utility lines constructed within wetlands, an anti-seep collar shall be placed at the
downstream (utility line gradient) wetland boundary and every 150 feet up the gradient until
the utility exits the wetland. Anti-seep collars may be constructed with class B concrete,
compacted clay, PVC pipe, or metal collars. Wetland crossings that are directionally drilled,
and perpendicular wetland crossings that are open cut and less than 150 feet long do not
require anti-seep collars. The compacted clay shall have a specific infiltration of 1 X 10-1
cm/sec or less. A section and plan view diagram is attached for the anti-seep collars. [15A
NCAC 02H .0506 (b)(4) and (c)(4)]
The following specifications shall apply to class B concrete:
a. Minimum cement content, sacks per cubic yard with rounded course aggregate 5.0
b. Minimum cement content, sacks per cubic yard with angular course aggregate 5.5
c. Maximum water-cement ratio gallons per sack 6.8
d. Slump range 2" to 4"
e. Minimum strength - 28 day psi 2,500
7. The applicant shall have a specific plan for restoring wetland contours. Any excess material
will be removed to a high ground disposal area. [15A NCAC 02H .0506 (b)(2) and (c)(2)]