HomeMy WebLinkAbout20120227 Ver 1_More Info Received_20120413Coulter Jewell Thames, PA
ENGINEERING LAND SURVEYING LANDSCAPE ARCHITECTURE
LETTER OF TRANSMITTAL
Date 4/11/2012
To NCDWQ
Attn Karen Higgins
WE TRANSMIT TO YOU HEREWITH
# Copies
■
Project The Reserve
Sheet No Date Description
4/11/2012 Low Density Supplement
2/18/2012 Cross Section Details
Remarks
Please let me know if you need anythm9 else
Thanks
Copies To
Daniel A Jewell ASLA RLA
James W Thames PE
Jeffrey P Williams PLS
From Preston Royster PE
Main Office 111 West Main Street Durham NC 27701
Phone 919 682 0368 Fax 919 688 5646
Email proyster(ftitpa com
lon.,06'�_ "L 7
ECEIVE
APR 1 3 2012
Permit No 131— O D- -a-1
(to be provided by DWO
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
LOW DENSITY SUPPLEMENT
Tins form may be photocopied for use as an original
A low density project is one that meets the appropriate criteria for built upon area and transports stormwater
runoff primarily through vegetated conveyances Low density projects should not have a discrete stormwater
collection system as defined by 15A NCAC 2H 1002(18) Low density requirements and density factors can be
found in Session Law 2008 211, 15A NCAC 2H 1000, Session Law 2006 246, and the DWQ BMP Manual
Curb and gutter systems are allowed provided they meet the requirements in 15A NCAC 2H 1008(g)
I PROJECT INFORMATION
Project Name -?W lkst,K�
Contact Person ;01Y FoSf, , gRr Phone Number ( 'ST& ) 5411- Ono
Number of Lots Z/ Allowable Built Upon Area (BUA) Per Lot* Zq%l SF �- /t1r;A"J>
N ber of Dwelling Units Per Acre ** a ;L �'4w++A' wj&
Low Density Development (check one) [] without curb & gutter ❑ with curb & gutter, outlets to (check one)
❑ Swales ❑ Vegetated Area
*If lot sizes are not uniform, attach a table indicating the number of lots, lot saes and allowable built upon area for each lot.
The attachment must include the project name, phase page numbers and provide area subtotals and totals BUA shall be
shown in units of square feet.
* *(Phase H Post - Construction (non SA) only)
H BUILT UPON AREA
Refer to DWQ s forms and applications website for specific language that must be recorded in the
restrictions for all subdivided projects (http //h2o enr state nc us /su/bmp_forms htm)
Complete the following calculation in the space provided below where
• SA Site Area the total project area above Mean High Water
DF Density Factor the appropriate percent built upon area divided by 100
RA Road Area the total unpervious surface occupied by roadways
Z y uUU
w o
N
O
• OA Other Area the total area of impervious surfaces such as clubhouses, teems courts, sidewalks, etc
No of Lots the total number of lots in the subdivision
• BUA per Lot the computed allowable built upon area for each lot including driveways and impervious
surfaces located between the front lot line and the edge of pavement
Total allowable lot BUA the computed allowable built upon area for all lots combined
Total BUA from lot listing the sum of built upon area allocated for each lot on the list of non uniform lots
Form SW401 Low Density Rev 3 2/10/09 Page 1 of 4
Calculation
For uniform lot sizes
(SA ft2 x DF ) — (RA ft2) — (OA ft2) = BUA per Lot = ft2
(No of Lots )
For non - uniform lot sizes
a (SA rn0j, 2 x DF ate) — (RA M%Irft) — (OA 0 ft2) = Total allowable lot BUA
b Total BUA from lot listing 75'9Z9L sf b must be :5 a
III DESIGN INFORMATION
Complete the following table If additional space is needed the information should be provided to the same
format as Table 1 and attached to this form Rainfall intensity data can be found in Appendix 8 03 of the State
of North Carolina Erosion and Sediment Control Planning and Design Manual or at
http //hdsc nws noaa gov/hdsc /pfds/
Table I Swale design information based on the 0-year storm
Swale No
Drainage
Area (ac)
Impervious
Area (ac)
Grassed
Area (ac)
C
Q
(cfs )
Slope
Vale °w
(f
ps)
V8C1ial
(fps)
Flow
Depth (ft)
1
SEE Mr
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Form SW401 Low Density Rev 3 2/10/09 Page 2 of 4
IV REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the North Carolina Administrative Code Section 15A
NCAC 2H 1000 NCDENR BMP Manual (2007) Session Law 2006 246 and Session Law 2008 211
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 that the following requirements
have been met and supporting documentation is provided as necessary If the applicant has designated an agent
on the Stormwater Management Permit Application Form the agent may initial below If any item is not met,
then justification must be attached Only complete items n through p for projects with curb outlets
Page/Plan
At a minimum, swales are designed to carry the 10 year storm velocity at a non erosive rate
Initials Sheet No
Swales discharging to wetlands are designed to flow into and through the wetlands at a non
NP. a t
For projects in the 20 coastal counties Per NCAC 2H 1005, a 50 foot wide vegetative buffer
P69 p : k
is provided adjacent to surface waters For Redevelopment projects a 30 wide vegetative
P, -f _
buffer adjacent surface waters is provided
FW P'P 5 b t
For HQW or ORW projects outside the 20 coastal counties A 30 foot wide vegetative buffer
F,p- I -
is provided adjacent to surface waters
?f;R F?-'g c t
For Phase H Post Construction projects All built upon area is located at least 30 feet
Sit
landward of all perennial and intermittent surface waters
P 411' wAd
Deed restriction language as required on form SWU 101 shall be recorded as a restrictive
t Protects in the Neuse, Tar Pamlico, Catawba River basins, and Randleman Lake may require additional buffers
covenant A copy of the recorded document shall be provided to DWQ within 30 days of
Ud
platting and prior to the sale of any lots
r3r. A0040e
Built upon area calculations are provided for the overall project and all lots
N LA f
Project conforms to low density requirements within the ORW AEC (if applicable per
15A NCAC 2H 1007)
l AtrAtJ+d�
Side slopes of swales are no steeper than 3 1, or no steeper than S 1 for curb outlet swales
Sig
n k6kgbh
Longitudinal slope of swales is no greater than 5% for non curb outlet projects calculations
for shear stress and velocity are provided if slope is greater than 5%
P i
—
At a minimum, swales are designed to carry the 10 year storm velocity at a non erosive rate
91
Pt_
Swales discharging to wetlands are designed to flow into and through the wetlands at a non
D•i -
erosive velocity (for this flow requirement into wetlands non erosive is velocity < 2 ft/s)
P69 p : k
Swale detail and permanent vegetation is specified on the plans
Dt-
M9 co, : 1
Swale detail provided on plans includes grass type(s) for permanent vegetative cover
Saa
►,tcwpm
Swales are located in recorded drainage easements
t & n tt
Length of Swale or vegetated area is at least 100 feet for each curb outlet
/A 011
The system takes into account the run off at ultimate built out potential from all surfaces
draining to the system (delineate drainage area for each swale)
N A. p tt
Curb outlets direct flow to a swale or vegetated area
t Protects in the Neuse, Tar Pamlico, Catawba River basins, and Randleman Lake may require additional buffers
tt Only complete these items for projects with curb outlets
Form SW401 Low Density Rev 3 2/10/09 Page 3 of 4
Apr 09 12 03 53p Discount Furniture World
V SWALE SYSTEM MAINTENANCE REQUIREMENTS
33bb8442b2 p 1
Mowing will be accomplished as needed according to the season Grass height mill not exceed six inches
at any time and grass will not be mowed too close to the ground or scalped
2 Swales will be inspected monthly or after evL ry runoff producing rainfall event for sedunent butld up
erosion and trash accumulation
3 Accumulated sediment and trash will be iemoved as necessary Swales will be reseeded or sodded
following sediment removal
4 Eroded areas of the swales will be repaired and reseeded Swales will be reLegetated as needed and in a
timel) manner based on the monthly inspections Side slopes must be maintained at the permitted slope
5 Catch basins curb cuts velocity reduction de-., ices and piping will be inspected monthly or after every
significant runoff producing rainfall event Trash and debris will be cleared awa) from gates, curb cuts
velocity reduction devices and piping
6 Swales will not be altered piped or filled ui without approval from NCDENR Division of Water Quality
I acknowledge and agree by my signature below that I am responsible for the performance of the six
maintenance procedures listed above 1 agree to notify DWQ of any problems with the system or pnor to any
changes to the system or responsible party
Print Name and Title
Address 3s� ~ I
Phone �
Date Z--
Signature
Note The legall} responsible party shou d not tie a humeor hers asmtciattnn Unless more than )0% of Me lots hare been sold and a
resident of the subdivision has been mimed ahc presicluit
l — —tZ4'1-C.X4 b1G a Notary Public for thc. State of��pyYG [ t c ,� County of
do hereby certify that _ i�Lt personally
dz� of P y appeared before me this
had �Q1� and acMo►tiledge the due execution of the forgoing Swale maintenance requirements
Witness ml hand and official seal
c06
gNo/sTena
to C
GOmrn F %P L)
s g 6 '2014 Z
SEAL
AU B\-� �� F
4 tVcE GOB 0
p aA
Form SW401 Low Density Rev 3 110109
Vtv commission expires 3 8, .2A 1�
Page 4 of 4
ATTACHMENTS
REQUIRED ITEMS CHECKLIST — JUSTIFICATION
d The deed restriction language from form SWU 101 is not recorded as a restrictive covenant Per a
phone conversation with Annette Lucas this language is not required because the allowable built upon
area is high It was determined that it is unlikely that the actual built upon area will be close to the
allowable value
g The side slopes for the swales are 3 1 on the road side of the Swale and 21 on the back side of the
swale 2 1 slopes are used to minimize the amount of disturbance The calculations for depth velocity
and shear stress have been performed based on the 21 slopes
Additional rip rap aprons will be provided at the downstream end of swales 17L 17R 18R and 2011
since they discharge into the wetlands Calculations for the rip rap aprons are attached
m All of the swales are located inside of the right of way
I.J
9
Lvr-S s
Z-1 c % IM
WWA,4An�>
lVrAL
60 a oc D 23f s
tD -
�_- � ---- -- = T —7d,71, Sc I LdT
DESIGN INFORMATION
TABLE 1
DITCH
DRAINAGE
AREA
ACRES
IMPERVIOUS
AREA
ACRES
GRASS
AREA
ACRES
RUNOFF
COEFF
Q(10)
FLOW
CFS
SLOPE
(/)
VELOCITY
ALLOW
FPS
VELOCITY
ACTUAL
FPS
FLOW
DEPTH
1L
010
007
003
076
055
136/6
950
412
023
1R
014
009
005
072
073
140%
950
445
025
2L
076
012
023
036
197
930/
950
491
040
2R
028
010
015
053
108
51/0
500
337
036
3L
040
008
012
039
112
64%
500
371
035
4L
012
002
004
039
034
20/6
5 00
178
028
5L
064
013
019
039
180
48%
500
375
044
511
014
006
008
058
058
48/o
950
282
059
6L
074
007
067
039
209
18/0
5 00
269
056
611
060
009
042
040
175
40%
500
348
045
7R
160
024
112
040
466
200/
500
342
074
8L
069
017
052
049
242
320/
500
347
053
8R
061
009
052
042
186
37%
500
343
047
9L
096
024
072
049
336
32%
500
376
060
10L
101
025
076
049
354
260%
1500
836
041
11L
016
005
011
052
060
113%
950
393
025
11R
054
005
027
034
133
30%
500
291
043
12L
011
003
008
052
041
30%
500
217
027
13L
012
004
008
055
048
70%
500
310
025
13R
067
010
023
036
173
76%
9 50
441
040
14L
004
002
002
064
018
85%
500
261
017
14R
110
011
033
031
249
1 92/o
950
519
044
15L
006
003
003
064
028
28%
500
192
024
15R
146
009
022
026
279
3 1 /o
500
355
056
16L
022
007
015
052
082
88%
950
386
029
16R
040
005
019
036
104
88%
550
410
032
17L
033
010
023
052
123
186%
1050
546
027
17R
045
007
020
037
121
180%
1050
537
027
18R
062
005
017
030
132
155%
950
519
029
19R
034
003
012
032
079
690/
500
350
030
20R
047
003
014
029
099
168%
950
516
028
21R
088
011
037
035
224
103/o
950
527
041
22L
027
Oil
016
058
1 13
79%
950
402
034
22R
1 024
008
016
055
095
88/
950
401
031
23L
010
005
005
064
046
17/
5 00
181
032
23R
022
004
015
044
070
15%
500
191
038
24L
007
004
004
064
032
150/
500
157
029
24R
006
002
004
058
025
20/
500
165
025
25L
023
006
014
047
077
97/
9 50
395
028
25R
011
004
007
058
046
93%
500
341
023
26L
1 040
008
024
043
124
115/
950
124
032
26R
015
006
009
058
063
130/
950
4 19
025
27R
133
033
067
045
435
17%
500
317
074
28L
022
009
013
058
092
34%
500
278
036
28R
013
005
008
055
051
33%
500
238
029
29R
010
004
006
058
042
32%
500
2 24
027
30L 1
102
020
061
043
315
1 90/ 1
500
3 05
064
30R
011
004
007
055
043
20%
500
1 89
0 30
31L
030
008
023
049
105
22/o
500
244
041
32L
013
004
009
052
048
150%/.
500
174
033
32R
014
006
008 1
058
058
170/
500
191
035
33R
007
004
.004
064
032
4 7%
5 00 I
2 41
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RIP-RAP C C O
Slope = 18 601Y
Q(10) = 123 cfs (from Rational Fon
V(10) = 5 46 fps (from Flowmaster)
ZONE 2
APRON MATERIAL
STONE FILLING (MEDIUM) CL B
L1
MULTIPLYER = 3
L1= 45 R
L2
MULTIPLYER = 6
L2= 9 It
WIDTH = 45 ft
RIP -RAP CALCULATIONS
Slope - 15 50 A
Q(10) - 132 CIS (from HydroCAD)
V(10) - 5 19 fps (from Flowmaster)
ZONE 2
APRON MATERIAL
STONE FILLING (MEDIUM) CL B
L1
MULTIPLYER 3
L1- 45 It
L2
MULTIPLYER - 6
L2- 9 ft
WIDTH = 45 ft
RIP RAP SWALE 17R
Slope = 18 00%
0(10) - 121 cfs
V(10) = 5 37 fps
ZONE 2
APRON MATERIAL
STONE FILLING (MEDIUM) CL B
L1
MULTIPLYER - 3
L7 45 It
L2
MULTIPLYER = 6
L2= 9 ft
WIDTH = 45 ft
Slope - 16 80 /
Q(10) = 099 cfs (from Hydraflow)
V(10) = 518 fps (from Flowmaster)
ZONE 2
APRON MATERIAL
STONE FILLING (MEDIUM) CL B
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MULTIPLYER = 3
L1= 45 ft
L2
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L2- 9 ft
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