20091070 Ver 1_Meeting Minutes_20080806

URS Memorandum

Date: July 23, 2008

Subject: Minutes from Interagency Hydraulic Design Review Meeting on July 23, 2008 for R-2612A
in Guilford County, 1:00 PM to 2:00 PM

Team Members:

David Wainwright - DWQ (present) Participants:
Amy Euliss - DWQ (present) Marshall Clawson, NCDOT Hydraulics
Andrew Williams - USACE (present) Vincent Rivers, NCDOT Hydraulics
Rachelle Beauregard - DOT - NEU (present) Dennis Hoyle, URS Corporation
James Pflaum- DOT - NEU (present) Eleni Riggs, URS Corporation
Brad Chilton - DOT - NEU (present) Susan Lancaster, NCDOT Roadway Design
Ashley Cox - DOT - NEU (present) Glenn Mumford, NCDOT Roadway Design
Karen Reynolds - PDEA (present) Roy Girolami, NCDOT Structure Design
Ron Lucas - FHWA (present)
Patty Eason - NCDOT Division 7 (present)

GENERAL NOTES

¦ The R-2612A project underwent a revision which removed a ramp and replaced it with a loop in
order to reduce the impacts to an Unnamed Tributary to Big Alamance Creek. This revision
reduced the impacts by approximately 100 feet.
¦ The R-2612A project has seven jurisdictional streams that cross the project and five wetland sites
in the vicinity of the project limits. The jurisdictional streams and wetlands are shown on the
following plan sheets: sheet 4, 6, 8, 10 and 11.

• At jurisdictional streams where pipes outlet, rip rap will be placed on banks and not in the channel
bottom.

Plan Sheet 4
¦ Pipe Crossing at Sta. 19+00 -L- (Existing 36" CMP) Jurisdictional Stream to wetlands and pond.
1600 Perimeter Park Drive
Morrisville, NC 27560
[phone] Phone
[phone] Fax

Page 2 of 4

¦ Pipe Crossing at Sta. 22+50 -Y1- (Proposed 42" Pipe) Wetlands to wetlands and pond.

- Preliminary investigation indicates that the pipe is in good condition.

- The outlet end of the existing pipe has an 18" scour hole.

- The discharge from the existing pipe currently flows into wetlands and then into a pond. The
proposed -Y1- line will fill portion of wetlands (0.17 acres). URS proposed to pipe under the -
Y1- line with a proposed 42" pipe and discharge into the wetlands and pond. Wetlands outside
of the proposed fill slope from the -Y1- line will remain.
Plan Sheet 6

¦ Pipe Crossing at Sta. 33+15 -L- (Existing 36" CMP) Jurisdictional Stream to pond.

- Preliminary investigation indicates that the pipe is in good condition.

- The fill slopes extend into the stream at this location and there was a discussion about
bringing the roadway fill slopes in at 1.5:1 instead of 2:1 to reduce the stream impacts. It was
decided that this would not reduce the impacts significantly and the slopes should remain at
2:1.
- URS proposed to place a junction box at the outlet of the existing 36" CMP and then have a
36" pipe from the junction box to the edge of the fill slope.

- Rip rap will be placed on the channel banks at this location since it is a jurisdictional stream.

¦ Pipe Crossing at Sta. 38+70 -L- (Existing 36" CMP) Jurisdictional Stream to wetlands and pond.

- Preliminary investigation indicates that the pipe is in good condition.

- The fill slopes extend into the wetlands at this location and there was a discussion about
bringing the roadway fill slopes in at 1.5:1 instead of 2:1 to reduce the wetland impacts
(impacted area estimated to be 0.05 acres). It was decided that this would be the best option
as it would bring the fill slopes in approximately 20' for almost 200 feet and reduce the wetland
impacts by almost one half. The steepened slopes will be rock plated to stabilize the slopes.
- URS proposed to place a traffic bearing drop inlet at the outlet of the existing 36" CMP and
then have a 36" pipe from the drop inlet to the edge of the fill slope. With the 2:1 fill slopes the
pipe was estimated to outlet at the waters edge of the pond so changing the slopes to 1.5:1
allows the water to be discharged from the pipe prior to reaching the pond.
¦ Pipe Crossing at Sta. 42+00 Rt. -L- (Existing Drop Inlet in US 421 median to 15" CMP) Pipe

system to Jurisdictional Stream.
- Preliminary investigation indicates that the pipe is in good condition.

vRS Page 3 of 4

The outlet end of the existing pipe is perched approximately 3 to 5 feet above the natural
ground, which caused a large scour hole and flows into a jurisdictional stream. The entire
stream is within the proposed fill slope. This stream is not required to be mitigated.
URS proposed to extend the existing 15" CMP pipe with pipe collars to the fill slope and outlet
into a lateral ditch.

Plan Sheet 8

¦ Pipe Crossing at Sta. 38+25 -Y- (Proposed 24" Pipe) Wetland to wetland

- This area was thought to be a jurisdictional stream but DOT - NEU pointed out that is was
actually a wetland. The wetland area is so small that the wetland symbol didn't show up on
the plan sheet. Approximately 0.09 acres of wetland will be impacted while approximately 60
linear feet at the outlet end will remain.
- URS proposed to place a 24" pipe under the -Y- line at the intersection of -RPC- and -RPD-.
There is a proposed TBDI with a 15" pipe that drains water from Ramp C directly into the
wetland area on the upstream end.

Plan Sheet 10

¦ Culvert Crossing at Sta. 12+30 -Y2- (Existing 3'X3' Box Culvert) Jurisdictional Stream under
Liberty Road.

- Preliminary investigation indicates that the culvert is in good condition.

- URS proposed to add special junction boxes at each end of the existing 3'x 3' box culvert and
extend to both fill slopes with a 48" pipe. Pipes will be angled to and from the junction boxes
in order to follow the existing stream flow.
- Rip rap will be placed on the channel banks at this location since it is a jurisdictional stream.

Plan Sheet 11

¦ Pipe Crossing at Sta. 17+60 -Y- (Existing 48" Concrete Pipe) Jurisdictional Stream under Woody
Mill Road.

- Preliminary investigation indicates that the pipe is in good condition on the upstream end. The
downstream end could not be accessed since it is now in a construction zone.
- URS proposed to add junction boxes at each end of the existing 48" concrete pipe and extend
to both fill slopes with a 48" pipe. Pipes will be angled to and from the junction boxes in order
to follow the existing stream flow.

URS Page 4 of 4

- Rip rap will be placed on the channel banks at this location since it is a jurisdictional stream.

¦ Culvert Crossing at Sta. 28+30 -Y- (Proposed 8'X8' RCBC) Wetland area to Jurisdictional Stream
under Woody Mill Road.

- The existing wetland area was a pond in the past with a large dam that was breached in the
past couple of years. The wetland area is no longer holding water but is filled with vegetation.
The pond area currently flows into a 60" CMP under Woody Mill Road.
- URS proposed to add an 8' x 8' RCBC paralleling the existing jurisdictional stream and
existing 60" CMP. The culvert inlet will be in the wetland area formed by the pond draining
when the dam was breached and the culvert will outlet into a lateral ditch that will flow into the
jurisdictional stream. The culvert outlet will be protected with rip rap on the channel banks.

- With the culvert being constructed parallel to the existing stream and 60" CMP, URS proposed
to construct the culvert in the dry. The construction of the culvert would be dependent on the
roadway's construction phasing and road closures which have not been determined yet.
There are pipes that connect into the culvert but their exact location can't be determined until
the construction phasing has been determined.

- The proposed culvert is approximately 680 feet long with a 2.2% slope. Because of this slope,
URS proposed to place three one foot high sills in the culvert, spaced at approximately 200
feet, in order to reduce the slope under 2%. Both the inlet and outlet of the culvert are
proposed to be buried one foot.
Meeting Adjourned