HomeMy WebLinkAbout20170239 Ver 1_U-3109B - 4C Merger Meeting Minutes_20180409DRMP, INC.
PRINCIPALS
Wayne D. Chalifoux
Donaldson K. Barton, Jr.
Glenn J. Lusink
Jon S. Meadows
Mark D. Prochak
Mark E. Puckett
Lawrence L. Smith, Jr.
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www.DRMP.com
Memorandum
DRMP Job #: 16-0264.001
To
From:
Subject:
Craig Lee, P.E.
Ryan Mitchell, P.E.
8000 Regency Parkway, Suite 175, Cary, North Carolina 275180
Phone: 919.650.1038
Date: February 18, 2018
U-3109B — 4C Merger Meeting, Division 7, Alamance County
A 4C Merger Meeting was held on February 15, 2018 at 3:00 pm in the NCDOT Century Center
Complex, Structures Conference Room `C' in Raleigh, NC. Those in attendance were:
Bill Elam
Mark Staley (phone)
April Norton
Jim Mason
David Teague
Piotr Stojda
Nick Lineberger
David E. Bailey
Patty Eason (phone)
Chris Haire
Ryan Mitchell
NCDOT
NCDOT
DWR
NCDOT
NCDOT
NCDOT
NCDOT
USACE
NCDOT
DRMP
DRMP
— Hydraulics Unit
— REU
— ECAP
— Geotech
— Roadway
— Cong. Mgmt.
— Division 7
919-707-6718
919-707-2948
919-707-9111
919-707-6136
919-707-6877
919-707-6322
919-814-5079
919-554-4884 x30
336-4887-0000
919-230-7857
919-650-7859
belam@ncdot.gov
mstaley@ncdot.gov
April. norton@ncdenr. gov
Jsmason@ncdot.gov
dteague@ncdot.gov
pstojda@ncdot.gov
nclineb erger@ncdot. gov
David.bailey2 @asce. army. mil
peason@ncdot.gov
chaire@drmp. com
rmitchell@drmp.com
An overview and update of the project was provided. The proposed roadway will cross Mill Creek
and one (1) unnamed tributary to Mill Creek. The project is within a Water Supply-II (WS-II)
watershed and located along the '/z mile Critical Area (CA) buffer of the water supply reservoir.
This project will include protection measures such as Hazardous Spill Basin (HSB) and grass
swales to the maximum extent practical (MEP). This project has been grandfathered and the
Jordan Lake Buffer Rules do not apply.
The meeting included a discussion of all jurisdictional areas impacted by the project. The following
is a description of the topics discussed at each site:
• Site 1: A 12'x 6' reinforced concreate box culvert (RCBC) will be constructed to provide
conveyance of the unnamed tributary to Mill Creek, Jurisdictional Stream SA. The culvert
will include sills and baffles and will be buried one-foot below existing surface. The
hydraulic design includes HSBs for outfalls to this stream.
David Baily asked that the sill and baffle detail be added to the culvert profile sheet.
David Bailey and Jim Mason discussed if mitigation was needed for surface water impacts
at the downstream end of the culvert where riprap is to be installed in the stream bed.
Follow-up determination is to be provided by Jim Mason.
Site 2: The proposed roadway will include a single span, 160' steel girder bridge over
Mill Creek. Spill throughs will be at 1.5:1. Hydraulic design will include HSBs for
outfalls to this stream.
Bridge bents from revised bridge design to be removed from final permit plans.
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• Site 3: The crossing at Jurisdictional Stream SB will include a 42" cross pipe with headwall on upstream
end. The pipe will not be buried. Riprap end treatment to be used for pipe outfall.
• Site 4 and 5: The crossing at Jurisdictional Wetland WA and Jurisdictional Stream SC will include a 30"
cross pipe. Pipe will not be buried. No headwall and standard riprap pad at outfall. The location of the
Jurisdiction Stream on the plans will be revised by Location and Survey to match the pipe outfall location.
David Bailey stated that compensatory mitigation will not be required for Stream SC impacts due to low
aquatic function. 2:1 mitigation will be required for impacts to Wetland WA.
• Site 6: The crossing at Jurisdictional Wetland WB will include a 30" cross pipe. The pipe will not be buried.
No headwall and standard riprap pad at outfall. Cross pipe inverts to be placed at existing ground elevation
for all wetlands. Excavation for ditches in wetland areas will be minimal (approx. 4"-6"). The location of
the Wetland WB on the plans will be revised to match the pipe outfall location.
David Bailey noted that ditch detail "F" is not found on the ditch detail sheet. The call out for these ditches
will be revised to refer to ditch detail "N".
• Site 7: The crossing at Jurisdictional Wetland WC will include a 36" cross pipe with headwall on upstream
end. The pipe will not be buried. Riprap end treatment to be used for pipe outfall.
Wetland fill hatching to be added for rip rap outfall and accounted for in impact summary table.
Wetland boundary to be extended on south end of wetland to reflect actual boundary.
Explanation for why alignment was changed to this location needs to be added to permit narrative.
ACTION ITEMS
DRMP: Revise permit plans in accordance with comments stated in these meeting minutes.
NCDOT:
o Revise WB and WC wetland boundaries in WEX CADD file.
o Revise location of Jurisdictional Stream SC in FS CADD file.
o Determine mitigation needs for rip rap in stream bed for 12'x6' culvert outlet.
End of Memorandum
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