barrier island status report - Coastal Protection and Restoration ...

eaches E4, W8, W9 and W10 (over 83,000 linear feet; approximately 16 miles of sand berm)
were constructed under the NOD-20 emergency permit (Figures 15 and 16). Reaches W11 and
E3 were not constructed.
Monitoring was required as a part of the emergency permit. Transects were established
perpendicular to the shoreline, beginning at a point 1,000 feet landward from the inside toe of the
berm and ending at the -20 foot NAVD88 isobath. The constructed berms were surveyed along
these transects at five (5) time-intervals: after construction (as-built), and at 30, 90, 180 and 360-
days post-construction to estimate sand-volume-changes (Table 1).
Figure 15. Borrow Area and Sand Berm (E4) locations on the eastern side of the
Mississippi River. Sand for E4 was mined from Hewes Point to the north and either
placed directly into the berm, or transported to a rehandling area (RH-2) using a hopper
dredge (from borrow area HD-A). Borrow Area 6A was used as a temporary borrow site
to begin work on the northernmost 2,000 linear feet of Reach E4 of the sand berm and
was backfilled with sand from Borrow Area CH-B.
22 | P a g e