SW7090501_HISTORICAL FILE_20091210

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW 7D 1
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

�e r
NC®ENR
North Carolina Department of Environment and
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
December 10, 2009
Mr. Robert S. Hall, Senior Ex. Vice -President
State Employees' Credit Union
1000 Wade Avenue
Raleigh, NC 27605
0a:Rd
Natural Resources
Subject: Approved Plan Revision
SECU - Windsor
Stormwater Project No. SW7090501
Qertie County
Dear Mr. Hall:
Dee Freeman
Secretary
On December 10, 2009, the Washington Regional Office received a plan revision request for
Stormwater Management Permit Number SW7090501. The plan revision request is for the removal of the
vegetated filter strip located at the outfall of the constructed wetland system. Based on the current Division of
Water Quality Guidance on this issue your plan revision request is hereby approved. This guidance, which was
approved prior to this permit being issued, does remove the vegetated filter requirement from the discharge of
constructed wetlands. It has been determined that a formal stormwater permit modification is not required for
the proposed changes. We are forwarding you an approved copy of the revised plans for your files. Please add
the attached plans to the previously approved plan sheets dated June 2, 2009. Please remember to execute a
designer's certification verifying that the stormwater system and project has been constructed per the approved
plans as required under Section 11.8 of the permit and to submit the originally signed certification to the
Division.
Please be aware that all terms and conditions of the permit issued on June 2, 2009 remain in full force
and effect. Please also understand that the approval of this revision to the approved plans for the subject State
Stormwater Permit is done on a case -by -case basis. Any other changes to this project must be submitted to and
approved through the Division of Water Quality prior to construction. The issuance of this plan revision does
not preclude the permittee from complying with all other applicable statutes, rules, regulations or ordinances
which may have jurisdiction over the proposed activity, and obtaining a permit or approval prior to
construction.
If you have any questions concerning this matter, please do not hesitate to call me at [phone].
Sincerely,
Scott Vinson
Environmental Engineer II
AH\sv: K:\SAV\K-Stormwater\PLANREVISIONS\SW7090501
cc: Jamie Gollings - Jacobs Engineering Group
,/Washington Regional Office
Central Files
North Carolina Division of Water Quality Internet. v .nmaterqualhy.org One 1
943 Washington Square Mall Phone'. 252-946-64811 FAX, 252-946-9215 t v Urth Carol I n it
Washington, NC 27889 FAX, 252-946-9215
An Equal Opportunity 1 Affirmative Action Employer Naturally

Please check top of file
cabinet for plans for
this project.

JACOBS
December 8, 2009
NCDENR — Division of Water Quality
Attn: Scott Vinson
943 Washington Square Mall
Washington, NC 27889
[phone]
111 Corning Road
Suite 200
Cary, North Carolina 27518 USA
1.919.859.5000 Fax 1.919.859,5151
DEC 1 0 2009
RE: SECU — Intersection of US HWY 13 By -Pass & Grabtown Rd., Windsor, NC
Removal of By -Pass Vegetated Filter Strip from Constructed Wetland
Dear Scott,
I am writing you on behalf of Jamie Gollings regarding a plan revision to an approved Constructed
Wetland for the above referenced project. As you know, NCDENR has issued a Guidance Document
that removes the requirement of the by-pass vegetated filter strip as a major design element. It is my
understanding that you have spoken with Jamie about the deletion of the level spreader and vegetated
filter strip from the constructed wetland design and that this was verbally agreed to as acceptable.
Per your request, attached are two (2) copies of the latest constructed wetland plan which shows this
revision. Please review and confirm that this minor change will be acceptable.
Please call me if you have any questions.
Thank you and take care,
J( �Gt-
Josh Lambert, El
cc. Jamie Gollings, PE
David Kaiser, RLA
Jacobs Engineering Group Inc.

I]qDJACOBS
Carter Burgess
TO: Scott Vinson
NCDENR (252.946.6481)
943 Washington Square Mall
Washington, NC 27889
FROM: Jamie Gollinos
PROJECT: SECU -Windsor
PROJECT#: CB090229
Please find the following items for:
Review and Comment
FX Approval
0 Pick-up
[x Your Use
LETTER OF TRANSMITTAL
DATE: 26 May 2009
FAX: [phone]
PHONE: [phone]
Transmitted via:
Fax
Mail
0 Delivery
�X UPS
# Of Fax pages
COPIES
DATE
DESCRIPTION
2
N/A
Revised first page of supplement
2
26 May 09
Additional calculations related to 1-year peak flows
2
26 May 09
Revised sheet C5101 for removal of weeping love grass
2
26 May 09
Revised sheet L-1301
CARTER & BURGESS, INC., 111 CORNING ROAD SUTIE 200, CARY, NC 27618
TELEPHONE [phone] FAX [phone]

FX I'o t 1 c CA t. C_ CL jA't ION S
Type.... To Calcs Page 1.01
Name.... SUBAREA 10 '=NC�.•Z CK"
-YQ Fww Ytik- VcJ(to:ED
File.... W:\JOB\090229 - SECU Windsor\DESIGN\CALCS\Stormwater BMP\existing to calc.ppw
............................................... ... .... ... ...............
............................................... ..................... ....
TIME OF CONCENTRATION CALCULATOR
........................................................................
........................................................................
_. Segment #1: To: TR-55 Sheet
a .,
" "
pa97 5
4,
�solia6191ly�
C•AR0 A//i
Mannin s n
.1500
MAY 2
8 2009
X\'1SN
; oP FV-SS/o••`,p�'
Hydraulic Length
150.00 ft
Syr, 29hr P
Slope
00 in
ft/ft
_ 59
.0067006700
102
_
Avg. Velocity
.13 ft/sec
• Ch� CLQ'O g
c/rrE c,
%y . .
Segment #1 Time:
.3210
hrs y/F 11;11,
zc- ,h p1' ?cNJg
Segment #2: To: TR-55 Shallow
Hydraulic Length
300.00 ft
Slope .003000
ft/ft
Unpaved
Avg.Velocity
.88 ft/sec
------------------------------------------------------------------------
Segment #2 Time:
.0943
hrs
hrs z as M.N.
Total To:
4153
90
Ir'/ka-
Pn c-V'VCwoEo
�, 1ZAT�ONn1. C
56% w000s /Se1, ntea%/6rads/6kr> SJAcg
( kS/a P') (kSb IG')
C.),= Cc'A
0.53(a,-40(3,44) ncwn�.
S. 40 CFS <<< bft wl o-"
FZWCF OF'
0,03CFS�/
OR, l*'NG C,.1YN4- 0,1
( ocAs c�P<r 4ACE ( 1 Q, 14' (Q.S�)(G.13)(3,47)
C'' 00 CONP�S\TC C. O •S� 11t "fie 0.0-50
G 0.54 G = O.L, f - 0.25 Cvs »> D"WCA
I t�AZ E
SIN: Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 3:47 PM 5/20/2009

Type.... Tc Calcs
Name.... SUBAREA 10
Page 1.02
File.... W:\JOB\090229 - SECU Windsor\DESIGN\CALCS\Stormwater BMP\existing tc calc.ppw
__________________________________________
Tc Equations used...
------------------------------------------------------------------------
SCSTR-55 Sheet Flow =_________—______—__________________________
Tc = (.007 ((n Lf)**0.8)) / ((P**.5) . (Sf**.4))
Where: Tc = Time of concentration, hrs
n = Mannings n
Lf = Flow length, It
P = 2yr, 24hr Rain depth, inches
Sf = Slope, S
SCSTR-55 Shallow Concentrated Flow _______________________________
Unpaved surface:
V = 16.1345 . (Sf**0.5)
Paved surface:
V = 20.3282 * (Sf"0.5)
Tc = (Lf / V) / (3600sec/hr)
Where: V = Velocity, ft/sec
Sf = Slope, ft/ft
Tc = Time of concentration, hrs
Lf = Flow length, ft
SIN: Bentley Systems, Inc.
Bentley PondPack (10.00.027.00) 3:47 PM 5/20/2009

Table 2-2.
Values of SCS CN and Rational C for various cover conditions
(Based upon SCS,1986)
Cover Descri lion
SCS Curve Number
Rational C
Percent
HSG
A
HSG
B
HSG
C
HSG
D
HSG
A
HSG
B
HSG
C
HSG
D
Impervious
Fully developed urban areas
Open space
Poor condition (60%
ass
68
79
86
89
0.36
0.58
0.72
0.78
Farr condition (50 -75%
ass
49
69
79
84
0.15
0.38
0.58
0.68
Good condition (>50%
ass
39
61
74
80
0.15
0.22
0.48
0.60
Impervious areas
Pavement roofs
98
98
98
98
0.96
0.96
0.96
0.96
Gravel
76
85
89
91
0.52
0.70
0.78
0.82
Dirt
72
82
87
89
0.44
0:64
0.74
0.78
Urban districts
Commercial and
business
89
92
94
95
0.78
0.94
0.88
0.90
85
Industrial
81
88
91
93
0.62
0.76
0.82
0.86
72
Residential areas (by lot size
1/8 acre (town houses,
condos
77
85
90
92
0.54
0.70+
0.80
0.84
65
1/4 acre.
61
75
83
87
0.22
0.50
0.66
0.74
38
1/3 acre
57
72
81
86
0.15
0.44
0.62
0.72
30
1/2 acre
54
70
80
85
0.15
OAO
0.60
0.70
25
1 acre
51
68
79
84
0.15
0..36
0.58
0.68
20
2 acres
46
65
77
82
0.15
0.30
0.54
0.64
12
Agricultural areas
Pasture grassland
Poor
68
79
86
89
0.36
0.58
0.72
0.78
Far
49
69
79
1 84
0.15
0.38
0.58
0.68
Good
39
61
1 74
1 M
0.15
0.22
0.48
FO
Meadow mowed
30
58
71
78
0.15
0.16
0.42
0.56
Brush
0.15
0.15
0.15
0.15
-
Poor
48
67
77
83
0.15
0.34
0.54
0.66
_ Fair
35
56
70
77
0.15
0.15
0.40
0.54
Good
30
48
55
73
0.15
0.15
0.30
0.46
Woods and grass orchard
Poor
57
73
82
86
0.15
0.46
0.64
1 0.72
Fair
43
65
76
82
0.15
0.30
0.52
0.64
Good
32
58
72
1 79
0.15
0.16
0.44
0.58
Woods
Poor
45
66
77
1 83
0.15
0.32
0.54
0.66
Far
36
60
73
79
0.15
0.20
0.46
0.58
Good
30
55
70
77
0.15
0.15
0.40
M4
Row crops, straight, good
67
78
85
89
6.34
0.56
0.70
0.78
Row crops, contoured, good
65
75
82
86
0.30
0.50
0.64
0.72
Small grain, good
63
75
83
87
0.26
0.50
0.66
0.74
Farmsteads
59
74
82
86
0.18
0.48
0.6 4
0.72
In the table values of Rational C were computed from C = 0.020 CN -1.0
Copyright H.R. Malcom, 2003 [2-10] Hydrologic estimates

NC ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
May 15, 2009
Mr. Robert S. Hall, Sr.Ex. Vice -President
State Employees' Credit Union
1000 Wade Avenue
Raleigh, NC 27605
Subject: Stormwater Review SW7090501
SECU - Windsor
Bertic County
Dear Mr. Hall:
Dee Freeman
Secretary
This office received a Coastal Stormwater permit application and plans for the subject project on March 2, 2009.
A preliminary review of the project indicates that before a State Stormwater permit can be issued the following additional
information is needed.
I. Please revise the Wetland Supplement Form and provide calculations to include the "Peak Plow Calculations"
under Section 11. Design Information. Session Law 2008-211, Section 2.(b)(4)c, requires that the structural
control "Discharge the storage volume at a rate equal to or less than the predevelopment discharge rate for the
one-year, 24-hour storm."
2. Please remove weeping love grass from the seeding specifications on sheet C5101. Weeping love grass is not an
approved sediment & erosion control vegetation.
3. Plcase provide calculations for determining the length of the level spreader for the vegetated filter strip.
4. Please note that if the entire bottom of the forebay area is to be covered in rip rap for energy dissipation, the
routine sediment clean out will be very difficult. Can some be removed?
5. Please remove all woody vegetation from the 3:1 slopes of the constructed wetland shown on the Planting Plan,
sheet 1,1301. Trees and shrubs may be located on the "shallow land", but not on the slopes. Please clearly
separate & define the hatching for the planting areas between the shallow water zone and shallow land zone. Also
remove and/or fix the "MULCH" leader arrows around the wetland basin on this plan sheet as well.
6. Please do not forget to have any plans, calculations, supplements, narrative, etc. revised, signed, sealed and dated
as necessary when re -submitting.
The above requested information must be received in this office prior to May 26, 2009 or your application will be
returned as incomplete. The return of this project will necessitate resubmittal of all required items including the
application fee. If you need additional time to submit the required information, please mail or fax your request for
time extension to this office at the Letterhead address.
North Carolina Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
Internet: wm.nmalerquality.org
Phone. [phone] FAX: [phone]
FAX [phone]
One
NorthCarolina
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An FnurA Oonnrtunity 1 Affirmative AnIion Fmnlovnr

You should also be aware that the Stormwater Rules require that the permit be issued prior to any developrne-nt
activity. Construction without a permit is a violation of 15A NCAC 214.1000 and North Carolina General Statute 143-
215.1 and may result in civil penalties of up to $10,000 per day.
Please reference the Stormwater Project Number above on all correspondence. If you have questions, please feel
free to contact me at [phone].
cc: Jamie Gollings, PE (email)
David Kaiser, RLA, ASLA (email)
Washington Regional Office
Sincerely,
Scott Vinson
Environmental Engineer
Washington Regional Office
North Carolina Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
An Enual Onnom pity 1 Affirmative Aclion Emnlnvnr
Internet: www.nmaterquality.org
Phone: [phone] FAX: [phone]
FAX: [phone]
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