20110608 Ver 1_More Info Received_20111031

i
309 Cameronwood Drive
LEE R. NINES, J R., PE Fuquay-Varina, NC 27526
10 Phone [phone]
Email [e-mail]
October 24, 2011
Mr. Ian McMillan
NC DWQ, 401 /Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Subject: Highway 42 Commercial Subdivision` t
Johnston County¢
Dear Ian,
Please find attached the additional information that you requested in your letter dated September 21,
2011. I added a concrete level spreader at the outlet of the wet detention basin and an engineered
filter strip after the spreader and prior to the riparian buffer. Five copies of the plan details for the
level spreader and filter strip and the LS-VFS Supplement form are attached for your review.
I trust that this is sufficient for your review, but please feel free to contact me if you have any
questions or need additional information.
Sincerely,
?&r
Lee R. Hines, Jr. (Richie), PE
LRH/
cc: Highway 42 Associates, LLC RR "'?- 9 MR D
OCT 3 1 2011
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTI FICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
f. PROJECT INFORMATION
Project name Highway 42 Commercial Subdivision
Contact name Lee R. Hines, Jr. (Richie), PE
Phone number [phone]
Date October 20, 2011
Drainage area number One
II. DESIGN INFORMATION
The purpose of the LS-VFS Buffer Rule: Diffuse Flow
Stormwater enters LS-VFS from A BMP
Type of VFS Engineered fitter strip (graded & sodded, slope < 8%)

Explanation of any "Other" responses above

If Stormwater Enters the LS•VFS from the Drainage Area h
Drainage area fe Do not complete this section of the form. r y?
Impervious surface area fe Do not complete this section of the form.
Percent impervious % Do not complete this section of the form.
Rational C coefficient Do not complete this section of the form.
Peak flow from the 1 in/hr storm cfs Do not complete this section of the form.
Time of concentration min Do not complete this section of the form.
Rainfall intensity, l0-yr storm in/hr Do not complete this section of the form.
Peak flow from the 10-yr storm cfs Do not complete this section of the form.
Design storm Pick one:
Maximum amount of flow directed to the LS-VFS crs Do not complete this section of the form.
Is a flow bypass system going to be used? (Y or N) Do not complete this section of the form.
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from a BMP
Type of BMP Wet detention pond
Peak discharge from the BMP during the design storm cfs
Peak discharge from the BMP during the 10-year storm 14.19 cfs
Maximum capacity of a 100-foot long LS-VFS 10 cfs
Peak flow directed to the LS-VFS 10 cfs
Is a flow bypass system going to be used? Y (Y or N)
Explanation of any "Other" responses above
LS•VFS Design
Forebay surface area sq ft
Depth of forebay at stoater entry point
Depth of forebay at stormwmnvater exit point in
in
Feet of level lip needed per cfs 10 ft/cfs D
Computed minimum length of the level lip needed 100 ft g
O C T
Length of level lip provided 3 201,
100 ft
Width of VFS 80 ft
Elevation at downslope base of level lip 184.00 fmsl DEW - WATER QU4p
ADD
Elevation at the end of the VFS that is farthest from the LS 180.50 hsl
STOFA0*? MWIM
Slope (from level lip to the end of the VFS) 4.38 %
Are any draws present in the VFS? N (Y or N) OK
Is there a collector swale at the end of the VFS? N (Y or N)
Form SW401 - LS-VFS - 27Ju12011 - Rev.9 page 1 of 3
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10-year storm)
freeboard (during the 10-year stone)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
Y (Y or N)
Y (Y or N) Please provide plan details of flow splitter & supporting calcs.
3.00 ft
3.00 It
15.00 ft
0.29 It
1.48 ft
3.73 ft/sec
Pick one:
N (Y or N)
Y (Y or N)
W
B 1
Form SW401 - LS-VFS - 27Ju12011 - Rev.9 page 2 of 3
III. REQUIRED ITEMS CHECKLIST
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. M incomplete submittal package will result
in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the
following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been
met, attach justification.
Requried item:
1. Plans (1"- 50' or larger) of the entire site showing:

ild
t I ' ' Page or plan shed number and any notes: p

w V C ft ? KK SJ ?Itk f L5?y
5n i
-ou
,
- Design at ultimate bu
Off-site drainage (if applicable), ?Q
?tr?tA ?S°-Z ?? I? 1/(r

Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable), q
( p
sold 64 fl lrVIA l ff A ? V ? ?
Hgh flow bypass system,
Maintenance access 40W0
NA

, .
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
"
'
or larger) for the level spreader showing:
2. Plan details (1
= 30
- Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build-out.

"
' ii c {
v S ~ +
= 20
or larger) showing:
3. Section view of the level spreader (1
- Underdrain system (d applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
calculations (if a
licable)
il
of the flow s
littin
device and su
ortin
4
Pl
d
t ??++????+rr?? //11 7
WVl W Ip ?/?p a tv ?
f ?V?f1
AAM
.
g
pp
g
pp
.
an
e
a
s
p ,
l

5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
h of the VFS showing
ineered VFS is bein
then
rovide a
hoto
ra
If a non-en
used
6 } VW !I 1' ?/?
D IO VW r ?V ""` by t a -
g
p
p
g
p
g
,
.
that no draws are present.
LA& v?ali00(' Aig'[W
7. The supporting calculations.

8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
Form SW401 - LS-VFS - 27Ju12011 - Rev.9 page 3 of 3
Permit Number:
(to be provided by DWQ)
Drainage Area Number:
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC, 1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo e of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
(if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversi ht Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev. 3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Highway 42 Commercial Subdivision
BMP drainage area number:One
Print name:Charles D. Mast
Title:Member, Highway 42 Associates, LLC
Address:Post Office Box 119 Smithfield. NC 27577
Phone
Signa
Date:
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, WY1 ?'L N? L1 h , a Notary Public for the State of
/l1&'dn C6W 6 b AX, County of ? D{,t) , do hereby certify that
Chayto A personally appeared before me this a1151
day of OCtO 10V ZD I I , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
- - - - - - - - - - - - - - - - - - - -
Z
STEPHANIE W. MEDLIN
NOTARY PUBLIC
JOHNSTON COUNTY, NC
SEAL
My commission expires ?1 ' aq 1 41 g 015
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3

309 Cameronwood Drive
F uquay-Varina, NC 27526
LEE R. HINES, JR., PE phone [phone]
Email [e-mail]
DESIGN CALCULA'T'IONS
LEVEL SPREADER AND SPLITTER BOX
[PCN APPLICATION]
HIGHWAY 42 COMMERCIAL SUBDIVISION
JOHNSTON COUNTY, NORTH CAROLINA
OCTOBER 201 1
00?N ACA R
FO
ESs/py
SEAL
22993
?,<F FNGINEE? Q-'
''? R• HINES ????`?

DATE
e2' '? ? a a<
October 2011
PROJECT NAME PROJECT NO LEE IL HlTiE? JR
J"
Hi hway 42 Commercial Subdivision 10 03
LOCATION BY
Johnston County LRH
Use the 10-Year Discharge from the BMP to Determine the Flow Into the Splitter Box
Q 10 year= 14.19 cis
From Hydraflow Calcs
Only the Discharge from the 10-Year Storm (up to 10 cis) Should be Directed to the Level Spreader.
All Additional Flow Should Bypass the Spreader.
Q 10 Year= 14.19 cis
I Use 24-inch Pipe Into Splitter Box
HW/D < 1
From Chart C 200.3
Q 10 year = 10.00 Flow to Level Spreader (cfs)
Calculated Diameter (in) 19.5
Use 24-inch Pipe w / 19.5-inch Orifice
Plate to Level Spreader
10 year bypass 4.19 Bypass Flow cfs Use 15-inch Pipe Out of Splitter Box
HW/D < 1
Spreader Length
10 ft per 1 cis is Requ'd 100.0 ft 10 feet minimum length
Use 100 It 100 feet maximum length
The Height of the Weir Inside the S litter 19.5 inches
Q 10 year Bypass Flow = 4.19 cfs
From Manning Equation
From Chart C 200.3
Use the Q 10 Discharge in the Pemmanent Lining Calculations for the Bypass Channel.
?.
.; :
DATE
October 2011
.?
PROJECT NAME PROJECT NO
i
LEE
R HIKES, JR
Highway 42 Commercial Subdivision 10 03 4
LOCATION BY
Johnston County LRH
BYPASS CHANNEL DESIGN
STREET NAME
CHANNEL NUMBER LEVEL SPREADER #1 BYPASS CHANNEL
INTENSITY(2 yr) 5.76 in/hour
INTENSITY(10 yr) 7.22 in/hour
RATIONAL "C" 0.80
USE THE NORMAL-DEPTH PROCEDURE TO FIND THE DEPTH OF FLOW (Y) AT 02 & Q10 DISCHARGES IN A TRAPEZOIDAL CHANNEL
OF GIVEN DIMENSIONS. USE THE DEPTH TO FIND THE VELOCITY OF FLOW M AND THE SHEAR STRESS (T) TO DETERMINE THE
TYPE OF CHANNEL LINING THAT IS REQUIRED.
PROPOSED CHANNEL INFORMATION
PROPOSED BOTTOM WIDTH: 3.00 ft PROPOSED SIDE SLOPE: 3 :1
ALLOWABLE DEPTH OF FLOW: 1.00 ft
PROPOSED LINER INFORMATION
Straw with Netting PERMISSIBLE SHEAR: 1.55 Ib/ft^2
PERMISSIBLE VELOCITY: 5.5 ft/sec
TEMPORARY LINING

Q2= 0.86 Design Discharge [cfs] Note: The Entire 2-Year Storm Even
M = 3 Horizontal Component of Side Slope Is Directed to the Level Spreader and
n = 0.03 Manning Roughness Coefficient There is No Bypass Flow to Channel.
S = 4.10% Longitudinal Channel Slope [ft/ft]
B = 3 Bottom Width of Channel [ft]
Zreq = 0.09 Required Value
B Y A P R Zav
3 0.23 0.8487 3.61 0.24 0.32
V = 1.01 Water Val of Normal Depth Section [ft/sec]
T= 0.59 Shear Stress [lb/ft^2] TEMP LINING OK

USE: STRAW W/NETTING
+ --------------- -------------- -------------------- ---------------- +
PERMANENT LINING
Q10 = 4.19 Design Discharge [cfs] (Bypass Flow from Splitter Box)
M = 3 Horizontal Component of Side Slope
n = 0.03 Manning Roughness Coefficient
s = 4.10% Longitudinal Channel Slope [ft/ft]
B = 3 Bottom Width of Channel [ft]
Zreq = 0.42 Required Value
B Y A P R Zav
3 0.29 1.12 4.83 0.23 0.42 DEPTH OK
V = 3.73 Water Val of Normal Depth Section [ft/sec] VELOCITY OK

USE: GRASS

CHART 1O
180 10.000
144 4,000 EXAMPLE (1) ( 2? t 3)
138 8,000 o•K tR" to t.at
b.

144 5.000 a• t=0 a. 3
b.
4,000
I i
t32 fto

3,000
3'
4.
UT u u 4.
120 0 ti r.4
2,000 A La t.t 4.
3
too
'D tR t? .
3.
9b 1,000 3.
400

N
400 --
:--
500

x2
400 _
= 300 1.3 1.5
V
z N
40 u 200 VA. I.s
---
V s4
A
/ W
48 t00 =
00
/
u = 40 1.0

c 42 v
c
so 1(w SCALE EXTRA ?
40 0 T
W 34 30 (11 ?tia? MN dtU ; .9
e
r? .9
` 33 M
c 20 elm _ , e e
30
131 MM p/
27 MN?tM
10
t
4 4 .T
8 To rNuw10w(31rolw
ZI bowl"wev ft "do (1). IN*
4 "d HNtgN IWIRM 1{M MNM
O a/ O NMN, v rfN/N N .4 .b
3 stt..r..nw
Ib
2
../ 1-.3 L.s
L L Lo .5
I2 HEADWATER DEPTH FOR
HEADWATER SCAt.E3 263 GONGRETE PIPE CULVERTS
REVISIT MAY 1914 WITH INLET CONTROL
9UR9^0 Os ruw¢ MAGI iA& uu
181
t
a

n

417
,,'' a a Y
??.
Approximate Area of Level Spreader

I-f

411

Approximate Area of Filter Strip

NC 42 Commercial Subdivision PCN Application