20001432 Ver 1_Handouts_20130320

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SEDIMENT and FLOW REMEDIATION PLAN
CAROLINA TRACE, NC
Our plan for remediation of the accumulated sediments and increased flow entering
Carolina Trace and Lake Trace is divided into three sections. Refer to the attached
annotated maps from Google Earth. Map 4 is an overall site map.
Area 1. Stonegate Pond. Map 1. This area is considered to be the most important as it
intercepts the majority of sediments being transported from the highway construction
site. It essentially acts as a sediment pond but is now ineffective as it is nearing
capacity and passes the sediment along. The plan is to lower the pond and remove
sediments by mechanical means such as small dozers and /or backhoes., There is
plenty of area surrounding the pond to deposit the excavated sediments. See Google
Map 2. The area will be graded and grassed such that the sediments will not erode
back into the pond. A similar thing was done in 2001. Estimates are still being
prepared, but quantities could be in the order of 8,000 CY.
Area 2. Mouth of Carrs Creek (Lake Trace). Map 2. This area is where Carrs Creek
empties into Lake Trace. The sediments not being collected in Stonegate Pond are the
main source of these sediments. The area affected is primarily between No. 5 tee box
and No. 18 bridge. Lake Trace will be lowered about 5 feet. As at Stonegate Pond,
excavation will be accomplished using mechanical equipment and sediments will be
deposited on nearby shorelines. Quantities could be in the order of 10,000 CY.
Area 3. CTCC Holes 9 and 10. Map 3. There is a small stream collecting runoff from
Highway 87 and entering Carrs Creek. Our contention is that the removal of a pond and
wetland area of approximately three acres during the construction of the Bypass /NC 87
interchange without local mitigation has resulted in both damage and additional costs to
modify the waterway so as to accommodate the increased flow. Our plan is to replace
the existing 36" pipe culvert with a 48" pipe to handle the additional flow. The entrance
area will be straightened to improve efficiency. The open stream along No. 10 will need
riprap to stabilize some of the banks on outside curves. The culverts near No. 10 green
will also be replaced with 48" culverts. The stream near these culverts will be increased
to 5 feet to handle the increased flow. The area where this stream enters Carrs Creek
will also need stabilization with riprap.
Our only intent for the upcoming meeting is to gain general agreement on our
remediation plan (or to make adjustments thereto) so that we can go out for contractor
cost estimates. After cost estimates are obtained, they will be submitted to DOT in a
Tort Claim. We are attempting to take the actions needed to comply with any DOT,
Corps, and DENR guidance, to expeditiously correct the problems we have, and to do
so at a reasonable cost. For the upcoming meeting we propose we sit down and review
the maps and discuss our situation and mitigation approach. We should then visit all
areas of interest. We should probably then get back together and summarize results of
effort.
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