20140762 All Versions_R-2915B 4B Revised Meeting Minutes 20130729_20130729

Minutes from the Interagency 4B Hydraulic Design Review Meeting
R -2915B in Ashe County
June 20, 2013
Team Members:
Monte Matthews, USACE
(present)
Participants:
Marella Buncick, USFWS
(present)
Marshall Clawson, Hydraulics
Amy Euliss, NCDWQ
(present)
Vincent Rivers, Hydraulics
Marla Chambers, NCWRC
(present)
Josh Dalton, Sungate Design Group
Chris Militscher, EPA
(via phone)
Brad Smith, Sungate Design Group
Mitch Batuzich, FHWA
(present)
Tatia White, Roadway Design
Marls Staley, REU
(present)
Piotr Stojda, Roadway Design
Erin Cheely, NES
(present)
David Stutts, Strictures
Minutes:
Introductions were made by all
Josh Dalton proceeded through the plan sheets and drainage design
General:
Several plan sheets (8, 10 11, and 14) show rip rap devices extending beyond the right -
of -way lines. The right-of -irav sholrn on the plans is preliminary and hill be finalized
once the drainage design is complete. All rip rap devices bill be contained lrithin either
right-of- -lrav or Permanent Drainage, Easements.
grass swale treatment's of impervious surfaces. No comments.
Sheet 5:
Discussed grass swale treatment of impervious surfaces and separation of cross drainage
from roadway drainage to the maximum extent practicable. No comments.
Sheet 6:
Discussed grass swale treatment of impervious surfaces and separation of cross drainage
from roadway drainage to the maximum extent practicable. There will be impacts to the
wetland located left of station 180 +00 to 182 +10. The proposed fill slope covers the
existing wetland. A 6' base grassed swale will replace the wetland area which matches
the existing swale dimensions.
PDEA noted that there was no jurisdictional stream left of stations 177 +00 to 182 +50,
only wetlands. The FS file will be corrected by NCDOT.
The plans depict an existing "spring house" located on top of the stream right of station
189 +00. However, this is actually located on the top of bank. Pictures of the site were

reviewed. A question was asked regarding the slope of pipe 0615. Mr. Dalton could not
recall the slope of the pipe but would review the design calculations and revise as
necessary. A comment was also noted that pipe inlet 0613 should not be buried. (Slope in
original design iras 4.1 %. This has been revised to 1.0% by making structure 0614
deeper. Pipe inlet 0613 irill not be buried)
Sheet 7:
Discussed grass swale treatment of impervious surface
from roadway drainage to the maximum extent practici
The existing triple barrel box culvert will be
channel banks will be constricted and lined
existing culvert.
The survey file from NCDOT denotes the streak
the stream name is "Gap Creek ". The FS file wil
of cross drainage
with a three -span bridge. New
s II rip rap upon removal of the
Deep Gap Creek ". It was noted that
- orrected by NCDOT.
Reconfiguring the span arrangement was discussed with Strictures to possibly remove
the bents from the channel. A single span 72" MI3T was suggested but would require
raising the roadway grade several feet. This span arrangement was investigated during
design but was eliminated as an option due to site constraints.
All runoff from the
to the remnants of an
comment requesting in
spill basin. Mr. Dalton
hazardous Will basin. i
Sheet 8:
Discussed grass swale
from roadway drainag
swale calculation data
,posed roadway and off -site is discharged right of station 198 +00
xisting pond. The plans do not depict this area as a jurisdictional
rated that they would verify this was correct. It was noted that if
to be jurisdictional, then it should be considered a total take. A
e designers investigate changing the "filter berm" to a hazardous
stated that there was not adequate volume at this location for a
Hazardous spill basins are discussed belolr.)
nt of impervious surfaces and separation of cross drainage
maximum extent practicable. It was noted that the grass
asin4 left of station 215 +00.
Marshall Clawson stated that an elevation should be provided for the class II rip rap
located along the right fill slope. He recommended using an elevation one foot above the
100 -year event.
Sheet 9:
Discussed grass swale treatment of impervious surfaces and separation of cross drainage
from roadway drainage to the maximum extent practicable. A retaining wall has been
added to reduce impacts to the floodplain of Gap Creek. No comments.

There was a lengthy discussion regarding replacement of the existing 36" CMP. The
current design uses a grassed swale to convey stormwater along the north side of the road
all the way to the South Fork New River overflow bridge. The existing pipe 11411 be
replaced to maintain the OffS'lte existing drainage patterns.
Sheets 10:
PDEA noted that there was no jurisdictional stream at the overflow bridge, only
wetlands. The FS file will be corrected by NCDOT.
A comment was made that hazardous spill basins are needed at strictures 1019 and
1021. Basins would not be needed at strictures 1015 and 1017 due to the overland
distance from the main stream. Hazardous spill basins hill not be required after
discussion with DWQ. The storm hater outlets near the river hill be removed and the
water piped further allay to proposed P,�H's
Span arrangements for the bridge over the South Fork New River were discussed. Due to
the amount of freeboard, a two span stricture was feasible. However, that would place
the bent in the middle of the stream. The Agency members did not prefer this option.
Also, debris problems are recurrent at the existing bent in the channel. It was suggested to
investigate shifting the spans to possibly get one bent out ofthe stream (1 @80', 1 @100',
1 @80'). With this span arrangement, bent 91 would be further into the channel and
possibly cause debris problems. Also, bent 42 would be right at the top of bank which is a
bad location due to potential bank scour problems. It was determined that the proposed
span arrangement was the best option.
Strictures stated that a causeway will be required to remove the existing bridge and
construct the proposed bridge on the South Fork New River. They will provide the
It was noted that the "Committee for the New River" requested a river access point at this
location. Trent Beaver noted that property owners usually would not agree to this. Tatia
White stated that she would check on this item and address the comment.
A comment was made that hazardous spill basins are needed at strictures 1103, 1106,
1108, and 1111. The inlets should be tied together and outletted to a common hazardous
spill basin. Several options for basins were discussed including putting the basin up at the
shoulder point in fill or using a prefabricated tank system. (Hazardous spill basins are
discussed below.)
Reviewed photos of jurisdictional sites.
Meeting adjourned.