20080867 Ver 1_More Info Received_20081107

LETTER OF TRANSMITTAL
DEVELOPMENT CONSULTING SERVICES, INC.
1401 Aversboro Road, Suite 206
Garner, North Carolina 27529
[phone] phone
[phone] fax
L
iN0V ? 2008
DENR - VgATER CU UTY
JdF LAND, AND STORMC..A•Fh 3FZ°.4CN
To: Annette Lucas
Company: NCDENR-DWQ
Address:
From: Dexter Howell
Date: Thursday, November 06, 2008
RE: Millstone Ridge Phase 2
URGENT F-] Reply ASAP r Please Comment Please Review 1:1 For Your Information
COPIES DATE NO. DESCRIPTION
5 11/06/08 Sets of plans
1 11/06/08 Scour Hole Calculations
1 11/06/08 O & M Agreement
1 11/06/08 Low Density Deed Restriction
1 11/06/08 Level Spreader 1,2 & 3 Calculations

Comments:

DRAINAGE AREA #3
(LEVEL SPREADER #2)
DESIGN CALCULATIONS
MILLSTONE RIDGE
JOHNSTON COUNTY, NORTH CAROLINA
Yv'??aa?J ?,ho
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
[phone]
??t,et+tuttN??i
"Alrp-? 'SEAL
023728' D I r
AV*i
NCDENR
P ?c
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, printed and submitted.
1I, PROJECT INFORMATION PROJECT INFORMATION
Project name Millstone PAdie - Phase 2
Contact name Deyelcpmen; Consulting Services, Inc. (Matt Collins)
Phone number [phone]
Date
Drainage area number 3 (Level Spreader #2)
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 54,450 fe
Impervious surface area 15,000 fig
Percent impervious 0,28
Rational C coefficient 0.55
Peak flow from the 1 in/hr storm 0.6875 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 4.96375 cfs
Where Does the Level Spreader Discharge ?
To a bioretention cell? N' (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 ft
Width of dense ground cover 50 ft
Width of wooded vegetation 0 ft
Total width 50 ft
Slope (from level lip to to top of bank) 6.5 %
Are any draws present? N (Y or N)
Level Spreader Design
Forebay surface area 30 sq ft
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr, 24-hr storm? Y (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 4.06 cfs
Is a bypass device provided? N (Y or N)
Please complete filter strip characterization below.
OK
OK
A bypass device is not needed.
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
65 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cis Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
* w
i
t--------- y ----------1 t
M M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 2 of 2
2
#II. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An 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.
Pagel Plan
Initials Sheet No.
"Dit C ^2 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
0--(, - Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
_DA ? C' Z 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
- Recorded drainage easement, and
Design at ultimate build-out.
C"Z 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4" 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
5. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
??n 5? 7. The supporting calculations.
?T. C 8. A copy of the signed and notarized inspection and maintenance (AM) agreement.
-1 J 9. A copy of the deed restriction.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2
Part III, page 1 of 1
3
Level Spreader #2

MILLSTONE RIDGE-PHASE 2
LEVEL SPREADER #2 - DRAINAGE AREA CALCUALTIONS
DRAINAGE AREA: 1.25 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.34 AC 27.2%
RUNOFF COEFFICIENT ( C )
Cpre= 1.25 AC x 0.25 + 0.00 AC x 1.0 =
0.25
1.25 AC .
Cpost= 0.91 AC x 0.25 + 0.34 AC x 1.0 =
0.45
1.25 AC .

10 YEAR STORM
Qpre=CIA= 0.25 x 7.22 x 1.25 = 2.26 cfs
Qpost=CIA= 0.45 x 7.22 x 1.25 = 4.10 cfs
STORM DATA
STORM EVENT INTENSITY (I) PRECIPITATION
DEPTH P
10 YEAR 7.22 in/hr 3.9"

DETERMINE SOIL STORAGE
CN= 98 x 0.27 + 55 x 0.18 + 61 x 0.55 = 70
S = 100 -10 = 69 90 -10 = 4.30°
RUNOFF DEPTH Q* _ (P-0.2*S)Z
(Q*) (P+0.8*S)
Q* x DA x 43560 SF/AC
TIME TO PEAK (Tp) Tp= 12 in/ft
1.39 x Qpost
10 YEAR STORM
* _ (3.9 - 0.2 x 4.3 )^2
Q (3.9 + 0.8 x 4.30) = 1.26 in.
1.26 in.
_ x 1.25 AC x 43560 SF/AC
Tp 12 in/ft = 16.7 min.
1.39 x 4.10 cfs
? PEAK 4.10 cfs @ 16.7 min.

DRAINAGE AREA #4
(LEVEL SPREADER #3)
DESIGN CALCULATIONS
MILLSTONE RIDGE
JOHNSTON COUNTY, NORTH CAROLINA
JJ
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SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
[phone]
ot"1H1111#10
??'(H CA e•
Ro
ES 0- Z 0.,
% 0110
SEAL
023728 ??a
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AMI
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
O? ?G
P Y
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled outnted and submitted.
ion "AM#711 Mai MMMM
?
f= t?.9?f1
,
I, PROJECT INFORMATION
Project name Millstone Ridge - Phase 2
Contact name Development Consulting Services, Inc. (Matt Collin;)
Phone number [phone]
Date
Drainage area number 4 (Level Spreader #3)
1II. DESIGN INFORMATION INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 11,326 fe
Impervious surface area 4,530 fe
Percent impervious 0.40
Rational C coefficient 0.7
Peak flow from the 1 in/hr storm 0.182006428 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 1.31408641 cfs
Where Does the Level Spreader Discharge ?
To a bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 0 It
Width of dense ground cover 50 ft
Width of wooded vegetation 0It
Total width 50 It
Slope (from level lip to to top of bank) 7 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 10 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr, 24-hr storm? Y (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 1.03 cfs
Is a bypass device provided? N (Y or N) A bypass device is not needed.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2 Parts I. and il. Design Summary, page 1 of 2

Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
18 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cis Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
W
,

M
y
j B j
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2
' t
----------1
0-000
M
Parts I. and Il. Design Summary, page 2 of 2
Z
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An 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.
Pagel Plan
Initials Sheet No.
1. Plans (1" 50' or larger) of the entire site showing:
Design at ultimate build-out,
- Off-site drainage (if applicable),
C-L Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
?? C Z 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
Recorded drainage easement, and
Design at ultimate build-out.
C"Z 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the t
e of ve
etation that is
t
yp
g
presen
.
5. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
`??? ?" 4' 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
7. The supporting calculations.
714C 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
7 `+'r :?D 9. A copy of the deed restriction.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2
Part III, page 1 of 1
3
Level Spreader #3
4

MILLSTONE RIDGE-PHASE 2
LEVEL SPREADER #3 - DRAINAGE AREA CALCUALTIONS
DRAINAGE AREA: 0.26 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.10 AC 38.5%
RUNOFF COEFFICIENT ( C )
Cpre= 0.26 AC x 0.25 + 0.00 AC x 1.0 =
0.25
0.26 AC .
Cpost= 0.16 AC x 0.25 + 0.10 AC x 1.0 = 0.54
0.26 AC

10 YEAR STORM
Qpre=CIA= 0.25 x 7.22 x 0.26 = 0.47 cfs
Qpost=CIA= 0.54 x 7.22 x 0.26 = 1.01 cfs
STORM DATA
STORM EVENT INTENSITY (I) PRECIPITATION
DEPTH P
10 YEAR 7.22 in/hr 3.9"
S
I
DETERMINE SOIL STORAGE
CN= 98 x 0.39 + 55 x 0.00 + 61 x 0.61 = 75
S= 100 -10 = 75.0 -10 = 3.26"
RUNOFF DEPTH Q* _ (P-0.2*S)2
(Q*) (P+0.8*S)
Q* x DA x 43560 SF/AC
TIME TO PEAK (Tp) Tp= 12 in/ft
1.39 x Qpost
10 YEAR STORM
Q* _ (3.9 - 0.2 x 3.3 )^2 = 1.62 in.
(3.9 + 0.8 x 3.26)
1.62 in.
_ x 0.26 AC x 43560 SF/AC
Tp 12 in/ft = 18.2 min.
1.39 x 1.01 cfs
? PEAK 1.01 cfs @ 18.2 min.
t?
a
SCOUR HOLE
DESIGN CALCULATIONS
N u y' 7 -
r-' 0j.
ULPdk - WAFER QUALI V
WETLANX AND STL(;",lAATE?- RRARCf j
MILLSTONE RIDGE - PHASE 2
JOHNSTON COUNTY, NORTH CAROLINA
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
[phone]
CAR, of ,
a y
SEAL
a
023728 10.
<'0'
R0
1011, 4f 9?? %
'floss mlls,00",
k t ls45fc f?'dgc
SCou v 4011 :? I -1,'ooqe _'Ayea. 4? 4
Q = o cFS 18 i cP
?L15e wed - W4 = 3 x ??;,e 3 X ?,5 - y.s?
use 4.5 ' x M. 5 SCOt?+r lno{t
SCbI r Hart -4 Z -D'Q.I," Prrea -* !5
Q = ;E?, 8 C7s l 8 " (zCP
Base W'i&I+L - Wg 3 X I.5/ _ Y-51
use 4-S' X4,S' -5Co4.r _"le k
Scour l?a(c *7, ?y-Wrage I?re.0. 9
Q = 5.8 v:5 (8ga-P
3a5e W?o?`I - wes = 3 x (A 4. S
use 4•s' X 4.s' scow, kolt
?'ou r 4a It 4 l??' a yc Iyrca -tt 8
Q = I.q cFS )8 It p?
?ase laid +4., - V'm = 3 X t.5' _ 4. S
Q = Z. 9 CFS 15 It
fZC j?
?ase Wiot$-L. - wg = 3 X I.zs' = 3.75
use 3."75 'X 3."7S' SCou.1- ?fl?e
?'IoFaP oA o Sca-w kotts S ?e Class 3 G?Sa" g ?

INi,: t (4 , 2Z of ?
Scow. kpk -4 la bvio ;oo. ja Are- .. * (p
Q = 2.9 CF;-9 is #
i3ase lil)ia?44A. - W8= 3X 1.Z5'= 3.75
u5e- 3.75 K 3.7 s' Scow. Ino(e
fZ:,p-r4.p OK cxM Scour kote_S >6,U fx Cl&ss B C? - oo ")
So ?
/' o.,pPI.

MILLSTONE RIDGE-PHASE 2
SCOUR HOLE #4 - DRAINAGE AREA CALCUALTIONS
DRAINAGE AREA: 1.94 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.58 AC 29.9%
RUNOFF COEFFICIENT ( C )
Cpre= 1.94 AC x 0.25 + 0.00 AC x 1.0 =
0.25
1.94 AC .
Cpost= 1.36 AC x 0.25 + 0.58 AC x 1.0 = 0.47
1.94 AC

10 YEAR STORM
Qpre=CIA= 0.25 x 7.22 x 1.94 = 3.50 cfs
Qpost=CIA= 0.47 x 7.22 x 1.94 = 6.64 cfs
STORM DATA
STORM EVENT INTENSITY( I) PRECIPITATION
DEPTH P
10 YEAR 7.22 in/hr 3.9"
R
DRAINAGE AREA #2
(LEVEL SPREADER #I)
DESIGN CALCULATIONS
MILLSTONE RIDGE
JOHNSTON COUNTY, NORTH CAROLINA
;
qv 7 200
?'4 W s r ?, ?zu??iTv
p._ > h i CIE RAhGH
WE-
SUBMITTED BY: DEVELOPMENT CONSULTING SERVICES, INC.
1401 AVERSBORO ROAD, SUITE 206
GARNER, NC 27529
[phone]
0 wttt01111Q11bI//
t'' ,C eo??C •a//? ` 0I
EAR., pq
Q2,1728
c' /? •nomno•••o ?j aA
ATA
NCDENR

O 1
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be filled out, rinted and submitted.
I.; PROJECT INFORMATION
Project name Millstone Ridge - Phase 2
Contact name Development Consulting Services, Inc. (Matt Collins)
Phone number [phone]
Date
Drainage area number 2 (Level Spreader #1)
111, DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 15,682 fe
Impervious surface area 5,236 - '' fe
Percent impervious 0.33
Rational C coefficient 0.1
Peak flow from the 1 in/hr storm 0.252006428 cfs
Time of concentration min
Rainfall intensity, 10-yr storm 7.22 in/hr
Peak flow from the 10-yr storm 1.81948641 cfs
Where Does the Level Spreader Discharge?
To a bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr, 24-hr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
0 ft
50 ft
0 ft
50 ft
7.5 %
N (Y or N) OK

10 _ sq ft OK
13 ftlcfs
N (Y or N)
Y (Y or N)
N (Y or N)
1.43 cfs
N (Y or N)
A bypass device is not needed.
Form SW401-Level Spreader, Fifter Strip, Restored Riparian Buffer-Rev.2 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr, 24-hr storm
Channel lining material
24 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cis Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
w

M

j B j
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.2
M
Parts I. and II. Design Summary, page 2 of 2
21
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An 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.
Pagel Plan
Initials Sheet No.
1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
- Recorded drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
V k C-7- 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Recorded drainage easement, and
Design at ultimate build-out.
C -Z 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
_ 5. An assurance that the installed system will meet design specifications upon initial operation once the

- project is complete and the entire drainage area is stabilized.
C
? 6. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
7. The supporting calculations.
''Ap
1tfT 74t'I6'X 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
_D A '?p _ 9. A copy of the deed restriction.
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.2
Part III, page 1 of 1
3
Level Spreader #1
4-

MILLSTONE RIDGE-PHASE 2
LEVEL SPREADER #1 - DRAINAGE AREA CALCUALTIONS
DRAINAGE AREA: 0.36 AC
EXIST. IMP AREA: 0.00 AC 0.0%
PROP. IMP. AREA: 0.12 AC 33.3%
RUNOFF COEFFICIENT ( C )
Cpre= 0.36 AC x 0.25 + 0.00 AC x 1.0 = 0.25
0.36 AC
Cpost= 0.24 AC x 0.25 + 0.12 AC x 1.0 = 0.50
0.36 AC

10 YEAR STORM
Qpre=CIA= 0.25 x 7.22 x 0.36 = 0.65 cfs
Qpost=CIA= 0.50 x 7.22 x 0.36 = 1.30 cfs
STORM DATA
STORM EVENT INTENSITY (I) PRECIPITATION
DEPTH P
10 YEAR 7.22 in/hr 3.9"
S
` M
DETERMINE SOIL STORAGE
CN= 98 x 0.34 + 55 x 0.00 + 61 x 0.66 = 74
S = 1000 -10 = 730 508 -10 = 3.59"
RUNOFF DEPTH Q* _ (P-0.2 *S)2
(Q*) (P+0.8*S)
Q* x DA x 43560 SF/AC
TIME TO PEAK (Tp) Tp= 12 in/ft
1.39 x Qpost
10 YEAR STORM
= 1.49 in.
Q* (3.9 + 0.8 x 3.59)
1.49 in.
x 0.36 AC x 43560 SF/AC
Tp= ^,, ;?,? = 18.0 min.
1.39 x 1.30 cfs
po? PEAK 1.30 cfs @ 18.0 min.

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 sputter device is Unclog the conveyance and dispose
(if applicable) clogged. of any sediment off-site.
The flow sputter device is Make any necessary repairs or
damaged. replace if damage is too large for
repair.
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Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
7A
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 a 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 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
1 6

(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:Millstone Ridge Phase 2
BMP drainage area number:
Print name:Crossroads Development Corporation
Title: Seeee, ?k rn< k
Address: 12400 NC Hn 50 North Willow Springs NC 27592
Phone:
Signature: vCt?
Date: ? b?o
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.
1, Nancy S. Stancil
North Carolina
Michael Coates
Permit Number:
a Notary Public for the State of
County of Johnston , do hereby certify that
personally appeared before me this 16th
day of July 1 2008 , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
41
i r
?j
SEAL
My commission expires
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
7-4-2009
1C

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('E"4'. r9Fl y
l.ow Density Residential Subdivisions K1CrLr, N,D?
Deed Restrictions it Protective Covenances
In accordance with Title 15 NCAC 21-1.1000, the Stormwater Management Regulations; deed restrictions
and protective covenants are required for Low Density Residential Subdivisions where lots will be
subdivided and sold. Deed restrictions and protective covenants are necessary to ensure that the
development maintains a "built-upon" area consistent with the applicable regulation governing the density
level.
11 dflck "/ _ ales acknowledge and affirm by my signature b21nx w, th I will cause the
following deed restrictions and protective covenants to be recorded for ? l"11A'atpe 4t Z
prior to the sale of any lot: -
1. The following covenants are intended to ensure ongoing compliance with State Stormwater
Management Permit Number-0.6--.2&Q--, as issued by the Division of Water Quality under
NCAC 2N.1000.
2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to
maintain compliance with the stormwater management permit -
3. These covenants are to run with the land and be binding on aft persons and parties claiming
under them.
4. The covenants pertaining to stormwater may not be altered or rescinded without the express
written consent of the State of North Carolina, Division of Water Quality.
5. Alteration of the drainage as shown on the approved plan may not take place without the
concurrence of the Division of Water Quality.
6. The maximum allowable built-upon area perlotis G 830 square feet This allotted amount
includes any built-upon area constructed within the to property boundaries, and that portion of the
right-of-way between the front lot line and the edge of the pavement Built upon area includes, but
is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, and coquina, but does
not include raised, open wood decking, or the water surface of swimming pools.
7. In the case of a lot within CAMA's regulated AEC, where the Division of Coastal Management
calculates a different maximum allowable built-upon area for that lot than is shown herein, the
governing maximum built upon area for that lot shall be the most restrictive of the two.
8. Filling in or piping of any vegetative conveyances (ditches, swales, etc.) associated with the
development except for average driveway crossings is strictly prohibited by any persons.
9. Each lot will maintain a 30 foot wide vegetated buffer between all impervious areas and surface
waters.
10. All roof drains shy# tefrrvina?te at 3'9jo9Yfrom t?,e mean high water mar/c of surface waters.
7/ zq,
I, Nancy S. Stancil , a Notary Public in the
State of North Carolina , County of Johnston
do hereby certify that Michael R. Coates personally appeared
before me this the 24th - day of July 20 08 , and acknowledge
the due execution of the foregoing instrument Witness my hand and official seal,
y
Signature
My Commission expires 7-4-2009
Form. DRPC-S Rev.1
Page 1 of 1

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