20131087 Ver 1_Adaptive Management Plan_20190412

fires
April 12, 2019
Paul Wiesner
NCDEQ — DMS
5 Ravenscroft Drive
Asheville, NC 28801
302 Jefferson Street, Suite 110
Raleigh, NC 27605
Corporate Headquarters
5020 Montrose Blvd. Suite 650
Houston, TX 77006
Main: 713.520.5400
RE: Poplin Ridge Stream Restoration Site — 2019 Monitoring Adaptive Management
Plan
Mr. Wiesner,
In July 2018, the IRT, NCDMS, and RES visited Poplin Ridge to evaluate the condition of UT2-2,
a passively restored stream reach through a drained pond bottom. The main problem was that a
distinct flow path was not obvious and the IRT determined credits were to be withheld above and
within the drained pond bottom. In September 2018 and April 2019, RES staff visited the site and
determined, using survey and visual assessment, that there is a preferred flow path but there are
several issues preventing flow from remaining within and defining a stream channel. Per the
request of NCIRT, RES is providing the following Adaptative Management Plan to address the
problems associated with the drained pond bottom.
Area 1
Issue: The log sill at the start of UT2-2 is set too high and is blocking flow during low flow
conditions.
Treatment: RES will notch the center of the log (approximately six inches deep and three to four
feet wide) to release flow downstream while still holding grade during high flow events.
Area 2
Issue: There are two headcuts forming downstream of Area 1 on UT2-2.
Treatment: RES will repair these headcuts by installing log sills to hold grade and to prevent
further bed degradation. A design detail depicting how the log sills will be installed is attached.
Area 3
Issue: The middle section of UT2-2 is relatively flat and the channel bed and bank is not well
defined.
Treatment: RES will excavate a baseflow channel through this section. The proposed channel
dimensions are a top width of four to six feet, a bottom width of two to three feet, and a depth of
six inches to one foot. Additionally, a minimum of three log sills will be installed throughout the
baseflow channel.
Area 4
Issue: The filter berm elevation at the downstream end of UT2-2 is too high and is therefore
impounding water within the lower third of the drained pond bottom.

Treatment: RES will notch the filter berm to allow flow to freely pass through the constructed
baseflow channel and to the culverts.
Area 5
Issue: The confluence of UT2-A and UT2-2 in the drained pond bottom is not well defined.
Treatment: RES will connect a baseflow channel on UT2-A to the baseflow channel on UT2-2.
Additionally, there is a lack of woody vegetation throughout the drained pond bottom. RES plans
to plant long (3-5') livestakes throughout the whole area. The livestakes will be inserted deep in
to the soil to increase the chance that their roots will be able to establish underneath the
unconsolidated muck. RES will plant species tolerant of very wet conditions like black willow
and buttonbush.
RES plans to have this work done in the summer of 2019 and will include documentation of the
repairs in the MY5 monitoring report. RES will also add two new cross sections to UT2-2 that
will be surveyed during normal monitoring in MY5 and MY7 with an additional survey in MY6.
RES plans to use visual assessment to determine the success of the livestakes.
Attached are photos and a map depicting the areas described above. Also attached is a design
detail depicting how the headcuts will be repaired using log sills.
Thank you,
P/W-V16z"�-L
Ryan Medric I Ecologist

Poplin Ridge Adaptive Management Plan Photos
Top of UT2-A looking upstream (01/29/2019)

UT2-1 looking upstream at constructed riffle (logs to be removed) (09/05/2019)

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UT2-1'
Withhold 490,ft
UT2-A
Area 1
s • ries
0 50 100
' Feet
1 inch = 100 feet
T2-2 Poplin Ridge Stream
Withhold 585 ft Restoration Project
MY5 2019
Area 3 t
Adaptive Management
Date: 4/3/2019 Drawn by: RTM
N =� �- .. s r • Area 4
LEGEND
'= Conservation Easement
Photo Station
-- BMP
Enhancement I
` Enhancement 11
UT2-A Preservation
Withhold 78 ft in Pond Footprint Restoration
As -Built Top of Bank
Pop_Ridge_Structures
® Flow Gauge
' O RIr 1, ain Gauge
Cross Section
Vegetation Plot
Installed January 2019 �.4.
1,
T
Area 2
Area 5

FROFO5ED
STREAM BED
Plow
l
BACKFILL WITH COARSE r
AGGUGATE (I" TO 5' DIA. f
NON -WOVEN
GEOTE TILE FADRIC
(NCDOT TYFE II)
MIN, v • _Y
TACK FABRIC
TO LD
F,EBAR OR DUCKBILL
ANCHOR
SECTION A -A
BACKFILL WITfii COARSE
AGGREGATE (I" TO 5" DIA.)
FOOL APPRO.
0.75' TO 1 .5' DEEP
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