20110260 Ver 1_More Info Received_20110325

. T

March 25, 2011
Mr. Andrew Williams
Regulatory Project Manager
U.S. Army Corps of Engineers
Wilmington District, Raleigh Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Reference: Response to February 24, 2011 Notice of Incomplete Application
SAW-2010-01840
The University of North Carolina at Chapel Hill
Orange County
North Carolina
Dear Mr. Williams:
11-oa--,o
GC?L?
MAR 2 5 2011
The following response and attached documentation are provided to address the remark
contained in your February 24, 2011 Notice of Incomplete Application pertaining to the
Individual Permit (IP) Application for Carolina North. The United States Army Corp of
Engineers' (USACE) remark is provided in italics and The University of North Carolina
at Chapel Hill's (UNC-CH or University) response follows:
Remark
Based on a review of your application, you propose impacts to 8 jurisdictional stream
channels. In order to minimize degradation of water quality, flow within these channels
should be diverted around the work (fill) area during construction. Please provide additional
details regarding your proposed method of stream diversion. If you plan to use temporary
coffer dams, vlease be aware that coffer dams are considered as temporary fill and
update/adjust your application and plans accordingly Please include a restoration plan for
any temporaryfills.
In your February 16, 2011 response to the remark above, you state that during construction
activities that impact streams, the water will be diverted around the work area. You state
that you plan to use sand bags to create temporary dams upstream of the work areas.
However, you do not quantify the amount of temporary impact associated with the sandbags
for each stream. Please indicate the amount of stream length in each stream that will be
temporarilyfilled with the sandbags. Please update any tables within the application that
show total impacts for the site.
The University of North Carolina at Chapel Hill
Department of Environment, Health & Safety
1 120 Estes Drive Ext., CB# 1650
Chapel Hill, North Carolina 27599-1650-
The University has quantified the amount of temporary impact to streams, in linear
feet, associated with the sandbags for each stream. Tables D-9, D-10 and D-11 have
been updated to show these temporary impacts for the site.
In the report section of the IP application, pages 51-52 of the report have been
revised. The table entitled "Phase 1 Carolina North Stream and Wetland Impacts (D-
9)" has been revised to show the 10 linear feet of temporary stream impacts to stream
1. Please replace pages 51-52 with the attached replacement pages, dated March 25
2011, Revision 2.
In the report section of the IP application, pages 53-54 of the report have been
revised. The table entitled "Phase 2 Carolina North Stream and Wetland Impacts
Table A (D-10)" has been revised to show 10 foot temporary impacts to streams 2, 8,
13, 14B, Bolin Creek, and Crow Branch, for a total of 60 linear feet of temporary
stream impact. Please replace pages 53-54 with the attached replacement pages,
dated March 25, 2011, Revision 2.
In the report section of the IP application, pages 55-56 of the report have been
revised. The table entitled "Phase 2 Carolina North Stream and Wetland Impacts
Table B (D-11)" has been revised to show 10 foot temporary impacts to streams 2, 8,
13, 14B, Bolin Creek, and Crow Branch, for a total of 60 linear feet of temporary
stream impact. Please replace pages 55-56 with the attached replacement pages,
dated March 25, 2011, Revision 2.
In Appendix D, Table D-9 entitled "Phase 1 Carolina North Stream and Wetland
Impacts" has been updated to show a 10 linear foot temporary stream impact to
stream 1. Please replace Table D-9 with the attached revised Table D-9, March 25,
2011, Revision 2.
In Appendix D, Table D-10 entitled "Phase 2 Carolina North Stream and Wetland
Impacts Table A" has been updated to show 10 foot temporary impacts to streams 2,
8, 13, 14B, Bolin Creek, and Crow Branch, totaling 60 linear feet. Please replace
Table D-10 with the attached revised Table D-10, March 25, 2011, Revision 2.
In Appendix D, Table D-11 entitled "Phase 2 Carolina North Stream and Wetland
Impacts Table B" has been updated to show 10 foot temporary impacts to streams 2,
8, 13, 14B, Bolin Creek and Crow Branch, for a total of 60 linear feet of temporary
impact. Please replace Table D-11 with the attached revised Table D-11, March 25,
2011, Revision 2.
Based on a request made during a phone conversation between the USACE and
UNC-CH on February 24, 2011, UNC-CH is providing a Pump-Around Detail with
explanatory text to present additional information on the nature of the temporary
{00027550.DOC) {00027550.DOC}Page 2 of 3
stream impacts associated with the Pump-Arounds. Please insert the Pump-Around
Detail, March 25, 2011, Revision 2, behind Table D-11 in Appendix D.
If you have any questions regarding this information or need additional information,
please contact me at [phone] or Ms. Jill Coleman at [phone].
Sincerely,
Ck
"J'? Sharon A. Myers, L. G.
Environmental Compliance Officer
cc: Ms. Jill Coleman
Dr. Daniel Elliott
Ms. Mary Beth Koza
Mr. Ian McMillan
Mr. Kevin Nunnery
Mr. Bruce Runberg
Ms. Anna Wu
Attachments: Revised Pages 51-52, dated March 25, 2011, Revision 2
Revised Pages 53-54, dated March 25, 2011, Revision 2
Revised Pages 55-56, dated March 25, 2011, Revision 2
Table D-9, March 25, 2011, Revision 2
Table D-10, March 25, 2011, Revision 2
Table D-11, March 25, 2011, Revision 2
Pump Around Detail, March 25 2011, Revision 2
{00027550.DOC) {00027550.DOC}Page 3 of 3
Table D-9 Phase 1 Carolina North Stream and Wetland Impacts
Wetlands
W
tl
d Impact Miti
ti
R
i Mitigation Cost
e
an (ac) ga
on
at
o acres $62,210/acre
2 0.005 2:1 0.010 $622
SUBTOTAL 0.005 0.010 $622
rounded up to the nearest .25 acre 0.250 $15,553
S treams
Temporary Permanent
Impact* Impact Mitigation Cost
Stream
(If) Mitigation
Ratio
(If) Mitigation
Ratio total
If
$338/If
1 10 none 31 2:1 62 $20,956
SUBTOTAL 10 31 $20,956
*temporary impacts are associated with pump-around devices for culvert extension installations,
see pump-around detail illustration at the end of Appendix D
Jordan Lake Buffer Impacts

Impact Zone l
(ft) Zone 2
(ft)
Mitigation Cost
Stream (If) 3:1 1.5:1 total ftZ $.96/sf
1* 0 0 0 0 $0
total impact 0 0 0 0 $0
* Jordan Lake buffer rules do not apply to stream 1
TOTAL WETLAND + STREAM + BUFFER = $36,509
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The following pump-around detail illustrates the linear extent of temporary stream channel impacts
associated with clean water and sediment sandbag dikes. The pump-around technique is often used
when extending culverts for road widening. These dikes are temporary, and their impacts do not require
mitigation.
APPROVED DEWATERING DEVICE
DISCHARGE HOSES
STREAM DIVERSION
PUMP
•-- P
DEWATERING PUMP
?. ? INTAKE
P HOSE
swoop qmn?
A A'
}
INTAKE
FLOW HOSE I
SEDIMENT SANDBAG DIKE POOL
CLEAN WATER SANDBAG DIKE '12" TO 1W
DEEP, 7 DIA.'
4000M r00 ammum 600owft rnowr
PUMPS SHOLD DISCHARGE
ONTO A STABLE VELOCITY
DISSIPATOR' MADE OF SANDBAGS
??--. WORKAREA
EDGE OF WATER PLAN VIEW
IMPERVIOUS SHEETING
f-
8
WORK AREA m FLOW
m 00
Q LL
N
U
J APPROXIMATELY 5' FOR
CLEAN SEDIMENT SANDBAG DIKE E SECTION A-A'
DIMENSIONS ARE SIMILAR
PUMP AROUND DETAIL
NOT TO SCALE
Appendix D
March 25, 2011 Revision 2
Carolina North Individual Permit Application - December 2010
• banks and in-lieu fee programs typically involve larger, more ecologically
valuable parcels;
• banks and in-lieu fee programs typically involve more rigorous scientific and
technical analysis planning and implementation than permittee-responsible
mitigation;
• on-site mitigation failure rates are historically high;
• on-site mitigation activities are particularly sensitive to land use changes, as
land use changes often alter local hydrology
Phase 1(2011-2016)
Unavoidable impacts associated with construction of the Research Building and related
infrastructure improvements (See Figure E-1 in Appendix E).
The University is proposing unavoidable impacts to 0.005 acre of jurisdictional wetlands and 31
linear feet of jurisdictional stream, as shown in the attached table. The USACE requires
mitigation for these impacts. There are no Jordan Lake Buffer impacts in this phase. The
University will acquire a one quarter-acre credit to cover the unavoidable wetland impact to
0.01 acre (0.005 acre of impact multiplied by a 2:1 mitigation ratio = 0.01 acre) in this Phase. The
credit purchased in this Phase will be applied to Phase 2 impacts. See the table below and in
Appendix D, Table D-9.
Phase 1 Carolina North Stream and Wetland Impacts (D-9)
Wetlands
W
l
d Impact i
i
i
i Mitigation Cost
et
an (ac) M
gat
on Rat
t
o acres $62,210/acre
2 0.005 2.1 0.010 $622
SUBTOTAL 0.005 0.010 $622
rounded up to the nearest.25 acre 0.250 $15,553
Streams
Temporary Permanent
St Impact* Miti
ti Impact Mi
i
i Mitigation Cost
ream (If) ga
on
Ratio (If) gat
t
on
Ratio total If $338/lf
1 10 none 31 2'1 62 $20,956
SUBTOTAL 10 31 $20,956
*temporary impacts are associated with pump-around devices for culvert extension installations,
see pump-around detail illustration at the end of Appendix D
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 51
Carolina North Individual Permit Application - December 2010
Jordan Lake Buffer Impacts
Impact Zone 1 (ftZ) Zone 2 (ftZ) Mitigation Cost
Stream (If) 3:1 1.5:1 total ftZ $.96/sf
1* 0 0 0 0 $0
total impact 0 0 0 0 $0
* Jordan Lake buffer rules do not apply to stream 1
I TOTAL WETLAND + STREAM + BUFFER = $36,509
Phase 2 (2016-2051)
Impacts associated with the remainder of the proposed 50-year Carolina North development
(See Figure E-1 in Appendix E).
The USACE is currently reviewing a position paper from UNC-CH related to mitigation for
wetlands that occur on the former municipal landfill. UNC-CH believes that these wetlands are
part of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)
program and, as such, impacts to them should not require mitigation. Until there is a
determination regarding the status of these wetlands, mitigation costs for Phase 2 cannot be
finalized. The attached tables summarize impacts and associated mitigation in two different
ways, one with the landfill wetland impacts excluded and one with the landfill wetland impacts
included.
A: Landfill wetland impacts excluded (Please see Phase 2, Table A, below and in Appendix D,
Table D-10.)
The University is proposing unavoidable impacts to 0.821 acre of jurisdictional wetlands and 247
linear feet of jurisdictional streams. The USACE requires mitigation for these impacts.
In addition, the University is proposing to impact 28,877 square feet (0.66 acre) of Jordan Lake
buffers. The DWQ requires mitigation for the Jordan Lake buffer impacts.
Total impacts in Phase 2A are 0.821 acre of wetlands, 247 linear feet of streams, and 28,877
square feet (0.66 acre) of Jordan Lake buffers.
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 52
Carolina North Individual Permit Application - December 2010
Phase 2: Carolina North Stream and Wetland Impacts Table A (Table D-10)
Wetlands
Impact Mitigation Cost
Wetland (ac) Mitigation Ratio acres $62,210/acre
A 0.099 1.1 0.099 $6,159
AB 0.572 1.1 0.572 $35,584
3 0.011 2.1 0.022 $1,369
T (5) 0.014 2.1 0.028 $1,742
6 0.037 2.1 0.074 $4,604
17 0.023 2.1 0.046 $2,862
18 0.065 2.1 0.130 $8,087
SUBTOTAL 0.821 0.971 $60,406
rounded up to the next.25 acre 1.000 $62,210
credit for Phase 1 payment 0.250 $15,553
balance for Phase 2 0.750 $46,658
Streams
Temporary Permanent
St Impact* Mitigation Impact Mitigation Mitigation Cost
ream (If) Ratio (If) Ratio total If $338/If
2 10 none 27 2:1 54 $18,252
8 10 none 47 2.1 94 $31,772
13 10 none 60 2.1 120 $40,560
14A** 0 none 174 none 0 $0
14B 10 none 20 2:1 40 $13,520
Bolin Creek 10 none 21 2:1 42 $14,196
Crow Branch (Wetland A) 10 none 72 2:1 144 $48,672
SUBTOTAL 60 421 $166,972
*temporary impacts are associated with pump-around devices for culvert extension installations,
see pump-around detail illustration at the end of Appendix D
**channel designated as Ephemeral by NC DWgand Unimportant by USACE-no mitigation required
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 53
Carolina North Individual Permit Application - December 2010
Jordan Lake Buffer Impacts

Impact Zone 1
(ft) Zone 2
(ft2)
Mitigation Cost
Stream (If) 3:1 1.5:1 total ft2 $.96/sf
2 27 2,805 2,966 $12,349
8 47 3,825 2,799 $15,047
13 60 3,700 1,915 $13,414
14A** 174 0 0 $0
14B** 20 0 0 $0
Bolin Creek 21 1,809 1205 $6,945
Crow Branch (Wetland A) 72 5,211 2,642 $18,812
total impact 421 17,350 11,527 28,877 $66,567
total required mitigation 52,050 17,291 69,341 $66,567
credit for stream restoration 22,680 15,120 37,800 $36,288
SUBTOTAL: net impact 29,370 2,171 31,541 $30,279
* please refer to figures in Appendix C for individual buffer area calculations
** Stream does not fall under the jurisdiction of the Jordan Lake Buffer Rules
I TOTAL WETLAND + STREAM + BUFFER = $243,908
B: Landfill wetland impacts included (Please see Phase 2, Table B, below and in Appendix D,
Table D-11.)
The University is proposing to impact 2.179 acres of jurisdictional wetlands and 247 linear feet
of jurisdictional streams. The USACE requires mitigation for these impacts.
In addition, the University is proposing to impact 0.228 acre of isolated wetlands, 100 linear feet
of isolated stream and 38,242 square feet (0.88 acre) of Jordan Lake buffers. The DWQ requires
mitigation for the isolated wetland, isolated stream and Jordan Lake buffer impacts.
Total impacts in Phase 26 are 2.407 acres of wetlands, 347 feet of stream and 38,242 square
feet (0.88 acre) of Jordan Lake buffers.
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 54
Carolina North Individual Permit Application - December 2010
Phase 2: Carolina North Stream and Wetland Impacts Table B (Table D-11)
Wetlands
Impact Mitigation Mitigation Cost
Wetland (ac) Ratio acres $62,210/acre
A 0.099 1.1 0.099 $6,159
X* 0.143 2:1 0.286 $17,792
XA* 0.025 2.1 0.050 $3,111
XB* 0.06 2:1 0.120 $7,465
Y 0.13 1.1 0.130 $8,087
Z 1.214 1.1 1.214 $75,523
AA 0.014 1'1 0.014 $871
AB 0.572 1.1 0.572 $35,584
3 0.011 2.1 0.022 $1,369
T (5) 0.014 2.1 0.028 $1,742
6 0.037 2.1 0.074 $4,604
17 0.023 2.1 0.046 $2,862
18 0.065 2.1 0.130 $8,087
TOTALS 2.407 2.785 $173,255
rounded up to the next.25 acre 3.000 $186,630
credit for Phase 1 payment 0.250 $15,553
balance for Phase 2 2.750 $171,078
*isolated wetlands
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 55
Carolina North Individual Permit Application - December 2010
Streams
Temporary Permanent
Impact* Impact Mitigation Mitigation Cost
Stream (If) Mitigation Ratio (If) Ratio total If $338/If
2 10 none 27 2:1 54 $18,252
5A** 0 none 100 2.1 200 $67,600
8 10 none 47 2:1 94 $31,772
13 10 none 60 2.1 120 $40,560
14A*** 0 none 174 none 0 $0
14B 10 none 20 2:1 40 $13,520
Bolin Creek 10 none 21 2.1 42 $14,196
Crow Branch (Wetland A) 10 none 72 2:1 144 $48,672
SUBTOTAL 60 521 694 $234,572
*temporary impacts are associated with pump-around devices for culvert extension installations,
see pump-around detail illustration at the end of Appendix D
**isolated stream
***Channel designated as Ephemeral by DWQ and Unimportant by USACE-no mitigation required
Jordan Lake Buffer Impacts*

Stream
Impact Zone l
(ft) Zone 2
(ft2)
Mitigation Cost
(If) 3:1 1.5:1 $.96/sf
2 27 2,805 2,966 $12,349
5** 100 6,255 3,110 $22,493
8 47 3,825 2,799 $15,047
13 60 3,700 1,915 $13,414
14A*** 174 0 0 $0
14B*** 20 0 0 $0
Bolin Creek 21 1,809 1205 $6,945
Crow Branch (Wetland A) 72 5,211 2,642 $18,812
total impact 521 23,605 14,637 38,242 $89,060
total required mitigation 70,815 21,956 92,771 $89,060
credit for stream restoration 22,680 15,120 37,800 $36,288
SUBTOTAL: net impact 48,135 6,836 54,971 $52,772
* please refer to figures in Appendix C for individual buffer area calculations
**isolated stream
***Channel designated as Ephemeral by DWQ and Unimportant by USACE-no mitigation required
I TOTAL WETLAND + STREAM + BUFFER = $458,421
Prepared by: Biohabitats, Inc. March 25, 2011 Revision 2 Page 56