20060738 Ver 3_More Info Received_20080122

ENGINEERS I PLANNERS I SURVEYORS
111 MacKenan Drive
CARY, NORTH CAROLINA, 27511
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WITI-I ERA ~~lw
January 20, 2008
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NC-Division of Water Quality JAN 2 2 2008
Attn: Ms. Cyndi Karoly
2321 Crabtree Blvd. DENR-WATERQUAl1TY
Raleigh, North Carolina 27604 WERANDS AND STORMWA7ER BRANCH
Re: Request for Additional information - TW Alexander Drive and ACC Boulevard Connection
W&R Project #: 0204276.1
DWQ Project #: 06-0738 Ver.3
Dear Ms. Karoly,
We received your request for additional information regarding the locations of the stream crossings,
EEP acceptance, and stormwater from adjacent development. I have included a brief response to
each of your requests below. Your letter asks for the following information:
1) Please re-design your crossings to more perpendicular locations.
Attached is a memo prepared by the project engineer that addresses the proposed alignment and
project constraints, such as fixed tie-in points and DOT standards.
2) Please provide documentation that NC EEP has approved your mitigation credits requested.
The EEP acceptance letter is included with the attachments.
3) Are the level spreaders designed to handle stormwater from adjacent development or will that
be required by local governments?
The level spreaders are designed to handle stormwater that is collected on the road. The local
govemmenfs will n:quire any development that occurs adjacent to T.W. Alexander and ACC
Boulevard to comply with the Phase 11 stormwater regulations as well as the City of Raleigh
stormwater requirements. In addition, the developers will also be required to comply with the
Neuse Riparian Buffer Rules.
Please feel free to call if you have questions or require additional information.
Sincerely,
WITHERS cS~RAVENEL, INC.
~f ~~? l/-----`~
Todd Preuninger
Director of Wetlands and Biological Sciences
Attachments:
1) Memorandum
2) DWQ request for additional information
3) EEP Acceptance Letter
4) Bridge Alternatives Analysis
RAV E IV E L
ENGINEERS I PLANNERS I SURVEYORS
iii MacKenan Drive i Cary, NC z75ii i tel: [phone] i fax: [phone] i www.withersravenel.com
7040 Wrightsville Avenue i Suite Io1 i Wilmington, NC z84o3 i tel: 9io.z56.9z77 i fax: 91o.z56.z58p
Brunswick Surveying i Ioz7 Sabbath Home Rd, SW i Supply, NC z8462 i tel: 91o.84z•9392 i fax: 91o.84z.8o19

('
WlTNERS ~.`'~~ RAVENEL
ENGINEEitS 1 PLANNERS I SURVEYORS
MEMORANDUM
TO: Todd Preuninger -Withers &Ravenel
CC: Lynn Raynor -City of Raleigh
FROM: Ken Dunn -Withers &Ravenel 7G`U~
DATE: 1!16/08
PROJECT: T. W. Alexander Drive and ACC Boulevard Connection - DWQ Project #: 06-0738, Ver.3
SUBJECT: Alternatives Analysis -Bridges
Pursuant to our conversation on January 10, 2008 regarding the permitting concerns as expressed in
the letter from NCDWQ dated December 19, 2007 to the Army corps of Engineers, we are
providing this memorandum as an alternatives analysis for the installation of bridges on the above
referenced project.
There are several factors to support why bridges are not viable alternatives to culverts on this
project. NCDOT generally prefers to install culverts instead of bridges whenever possible. The
maintenance costs of a culvert are much less than the costs associated with bridges. Second, the
master plan for this area has a focus on pedestrians and culverts generally provide for safer
pedestrian travel than bridges, since culvert installations offer a slope for pedestrians to seek refuge
on in case a dangerous condition arises.
Lastly, bridges are not a viable option for this project due to cost of construction. We need to
compare the cost of a bridge installation to the cost of a culvert at the same location. We have
prepared cost analysis and takeoffs on the culvert crossing shown in Figure 1 of the Wetland and
Buffer Impact Maps for this project so we would like to use this crossing to compare the estimated
costs of bridges vs. culverts. A preliminary design of the bridge shows that the bridge would require
approximately 9,100 square feet (70' wide x 130' span) of bridge decking, 2 bridge piers and 2 end
abutments. A reasonable estimate for the cost of bridge decking, including piers and the bridge
substructure, is approximately $160 /square foot. This would calculate to an estimated cost of
approximately $1.5 million. On the contrary, an engineer's estimate previously prepared by
Withers &Ravenel estimated the cost of the 72" RCP installation to be approximately $85,000.
Therefore, the cost of the bridge is greater than 17 times the cost of the 72" RCP installation. We do
not believe this cost increase justifies the use of bridges at any crossing on this project, especially
considering the size of the drainage areas for each crossing.
Please convey this information to Ms. Karoly for her consideration and feel free to call with
questions or if you require any additional information. ~/
iii MacKenan Drive I Cary. North Carolina 275ii I te1:919-469.334° ( X919.467.6008 I www.wither~
logo Wrightsville Ave I Suite io1 Wilmington, North Carolina z84o3 I tel: 91o.z56.9z77 I fax: 91o.z56.
1027 Sabbath Home Rd., SW I Supply, NC 28462 I tel: [phone] (fax: 91o.84z.8oi9

WITHERS ~`' RAVEN EL
ENGINEERS 1 PLANNERS 1 SURVEYORS
MEMORANDUM
TO: Todd Preuninger -Withers &Ravenel
CC: Lynn Raynor -City of Raleigh
FROM: Ken Dunn -Withers &Ravenel ~}~
DATE: 1 /16/08
PROJECT: T. W. Alexander Drive and ACC Boulevard Connectiion
DWQ Project #: 06-0738, Ver.3
SUBJECT: Response to NCDWQ Request for Information
Pursuant to our conversation on January 10, 2008 regarding the permitting concerns as
expressed in the Request for More Information in the NCDWQ letter dated December 19,
2007, we are providing this memorandum for justification of the proposed alignments on the
above referenced project.
Item 1 of the Request for More Information states:"Please re-design your crossings to more
perpendicular locations."
The roadway corridor of TW Alexander Drive was agreed upon over 10 years ago by
representatives from CAMPO, NCDOT, NCDWQ and the City of Raleigh. The beginning
point and terminus of the proposed TW Alexander Drive along this corridor was tied at each
end of the alignment in a manner consistent with the existing and proposed roadway
network(s) of the area. This portion of TW Alexander Drive being permitted begins at the
existing T. W. Alexander Drive/US 70 intersection and ends at Brier Creek Parkway, at a
location approximately 3000' northeast of the US 70/Brier Creek Parkway intersection. Per
the City's Transportation Plan, TW Alexander Drive is also required to have another proposed
intersection with ACC Boulevard, which is located roughly midway between US 70 and Brier
Creek Parkway.
Per the permit package, there are two main stream corridors along the roadway alignment.
Please note the original roadway corridor discussed previously crossed the two streams in the
vicinity of other stream confluences, which could have resulted in up to four separate stream
impacts. However, the alignment was revised during design to shift the roadway further
south at the western stream crossing and further north at the eastern stream crossing, which
avoided both stream confluences and reduced the project to only two stream impacts.
However, since the roadway alignment was shifted in opposite directions at each stream
crossing, and due to the skew of the existing intersection at US 70, TW Alexander Drive
required a series of horizontal curves in order to keep the roadway alignment along the
iii MacKenan Drive ~ Cary, North Carolina z75ii I te1:919.469.334o I fax:9i9.467.6008 I www.withersravenel.com
7040 Wrightsville Ave I Suite ioi Wilmington, North Carolina z84o3 I tel: 9io.256-9z77I fax: 92o.z56.2584
zo27 Sabbath Home Rd., SW I Supply, NC 28462 I tel: 9io.84z.939z I fax: 9io.842.8oi9

Page 2 of z
northeasterly corridor between US 70 and frier Creek Parkway, as well as reduce the skew
angles at each stream crossing. Furthermore, the intersections at ACC Boulevard and Brier
Creek Parkway also need to be designed perpendicular to promote safe and efficient traffic
movements.
Given the beginning/endingterrnini of the project, the small distances between each stream
crossing (1200'+/-and 1500'+/-), the three intersections involved, and the design speed of
the roadway (50 mph) we believe the current design is the best practical alternative to meet
the design criteria, while also reducing environmental impacts along the roadway corridor.
Please convey this information to Ms. Karoly for her consideration and feel free to call with
any questions or if you require additional information.
ui MacKenan Drive Cary, tynrth Carolinaz75ii tel:9ig.469.334o fax:9i9.467.6008 www.withersravenel.com

FlG. FROM TO LENGTH ~
INVERT UPSTREAM GROUND
ELEVATION DOWNSTREAM
INVERT DOWNSTREAM GROUND
ELEVATION
1 PE f51 PE x150 263' 347.24' 348.24' 343.12' 344.12'
2 INV IN IWV OUT 199' 346.80' 347.80' 345.00' 346.00'
3 EX.IIW NEW HW 263' 337.1Y (Ex) 337.2'1+/-) 335.17' 335.2'1+/-1
4 INV M INV OUT 253' PraOminary Preliminary -
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NOTES:
1. WETLANDS DELINEATED BY WITHERS & RAVENEL
AND SURVEYED BY JOHN A. EDWARDS & COMPANY.
2. EXISTING TOPOGRAPHY TAKEN FROM FIELD SURVEYS
BY JOHN A. EDWARDS & COMPANY.
GRAPHICAL SCALE
400' 200' 0 400' 800'
a
a
'! INCH = 400 FEET
CHANNEL NdPACi SUMMARY TABLE
(ROAD CROSSINGS)
MAPACi 7YPE CH SF LINEAR FT.
NO. (CH)
1C CH 2125 SF 421 LF
2C CH 550 SF 180 LF
3C CH 833 SF 58 LF
4C CH 3631 SF 390 LF
TOTAL: 7239 SF 1049 LF
CH=CHANNEL, NB=NEUSE BUFFER,
Z1=20NE7, ZZ=ZONE2
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Aso END CC
BUFFER IMPACT SUMMARY TABLE
(ROAD CROSSINGS)
MAPACi TYPE IMPACT AREA
NO. ISF)
to NRB-Z2 10,636 SF
1B NRB-Z1 20,556 SF
2A NRB-Z2 5,225 SF
26 NRB~1 8,712 SF
3A NRB-Z2 822 SF
~ NRB Z1 1,991 SF
4A NRB 22 11,134 SF
48 NRB-Zi 20,930 SF
TOTAL: 80,006 SF
CH=CHANNEL, NB=NEUSE BUFFER,
21=ZONE7, Z2=ZONE2
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WETLAND AND BUFFER IMPACTS
WITHERS RAVENEL T.W. ALEXANDER AND U.S. HIGHWAY 70
ENGINEERS 1 PLANNERS I SURVEYORS
mwdrn.~ w~. c.~.. wam r..w~. z~5n w:mwo a.:rs~.aooe .,..,.~ RALEIGH, NORTH CAROLINA
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PROGRAM
November 20, 2007
Lynn Raynor
City of Raleigh, Public Works
222 Hargett St
Raleigh, NC 27602 Expiration of Acceptance: May 20, 2008
Project: TW Alexander Extension County: WAKE
The purpose of this letter is to notify you that the North Carolina Ecosystem Enhancement Program (NCEEP) is willing to
accept payment for impacts associated with the above referenced project. Please note that this decision does not assure that
the payment will be approved by the permit issuing agencies as mitigation for project impacts. It is the responsibility of the
applicant to contact these agencies to determine if payment to the NCEEP will be approved.
This acceptance is valid for six months from the date of this letter and is not transferable. If we have not received a copy of
the issued 404 Permit/401 Certification/CAMApermtt within this time frame, this acceptance will ezpire. It is the
applicant's responsibility to send copies of the permits to NCEEP. Once NCEEP receives a copy of the permit(s) an invoice
will be issued based on the required mitigation in that permit and payment must be made prior to conducting the authorized
work. The amount of the In Lieu Fee to be paid to NCEEP by an applicant is calculated based upon the Fee Schedule and
policies listed at www.nceep.net.
Based on the information supplied by you the impacts that may require compensatory mitigation are summarized in the
followin table.
NEUSE Stream (feet) Wetlands {acres) Buffer I Buffer II
03020201 {Sq. Ft.) (Sq. Ft.)
Cold Cool Warm Ri arian Non-Ri arian Coastal Marsh
Impacts 0 0 1,049 0 0 0 50,198 26,996
Credits 0 0 2,098 0 0 0 i 50,594 40,493
Upon receipt of payment, EEP will take responsibility for providing the compensatory mitigation. If the regulatory agencies
require mitigation credits greater than indicated above, and the applicant wants NCEEP to be responsible for the additional
mitigation, the applicant will need to submit a mitigation request to NCEEP for approval prior to permit issuance. The
mitigation will be performed in accordance with the Memorandum of Understanding between the N. C. Department of
Environment and Natural Resowces and the U. S. Army Corps of Engineers dated November 4, 1998.
If you have any questions or need additional information, please contact Kelly Williams at (919) 716-I921.
Sincerely,
~•
William .Gilmore, PE
Director
cc: Cyndi Karoly, NCDWQ Wetlands/40I Unit
Jamie Shern, USACE-Raleigh
Ian McMillan, NCDWQ Wetlands/401 Unit
Todd Preuninger, agent (email)
File
R~storu~... ~ ... Prol~-~ Oct,Y Stc~,t~
~~~IR
North Carolina Ecosystem Enhancement Program, 1652 Mail Service Center, Raleigh, NC 27699-1652 / 919-715-0476 / www.nceep.net