Erosion and Sediment Pollution Control Program Manual.pdf

4. The maximum spacing between collars should be 14 V or LS (number of collars minus 1).
For the example temporary basin, the maximum spacing would be 14 X 3 = 42 feet. This would use
84 feet of the 87 total for LS.
Therefore, the maximum spacing for the example permanent basin would be 43.5 feet.
Minimum spacing should be 5 X V.
5. Anti-seep collars and their connections to the pipe, or barrel, should be watertight.
6. Anti-seep collars should be located below the phreatic line in the embankment and should be
evenly spaced.
7. They should not be located closer than 2 feet to a pipe joint.
8. There should be sufficient distance between collars for hauling and compacting equipment.
9. Metal anti-seep collars may be used on temporary basins and should meet the standards of
Standard Construction Detail #7-15. Plastic anti-seep collars may be an acceptable alternative.
Concrete anti-seep collars should be used on permanent basins and should meet the standards
of Standard Construction Detail #7-16. For most basins, the concrete anti-seep collar shown in
PennDOT’s RC-71M, dated 2008 is an acceptable alternative. Wood, fabric, and other
degradable materials are not acceptable. Other nondegradable materials may be approved on a
case-by-case basis.
10. The dimension of one side (S) of each collar is equal to 2V + Barrel diameter.
363-2134-008 / March 31, 2012 / Page 205