20070453 Ver 2_More Info Received_20070823

Soil & Environmental Consultants, PA
11 0 e~i ~q~j ~h, North Carolina 27614 Phone: [phone] Fax: [phone]
((~~ ~`''JJ c
~~('~ ~ j 107
www.SandEC.com
Division of Water Quality - 401 Oversight and Express Review Unit
Attn: Cyndi Karoly/Ian McMillan
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's 08/10/07 request for additional information
Panther Rock Subdivision
Wake County, North Carolina
Dear Ms. Karoly and Mr. McMillan:
This letter is in response to your letter dated August 10, 2007, which requested additional
information for the proposed Panther Rock Subdivision development. The following
restates your questions/comments and is then followed by our response.
Additional Information Requested
Please include a detailed site plan (scale 1 " = 100' or larger) that
depicts the following:
- Lot boundaries
- Lot numbers
- The stormwater drainage system (including all stormwater
outfalls
- Drainage area boundaries
- Locations of streams, wetlands and buffers
- The boundary of Phase I and the boundaries of future phases.
Please find the attached revised overall site plan for the Panther Rock Subdivision. It
should be noted that this plan includes lot numbers as well as building envelopes to
demonstrate that home sites can be constructed without additional impacts to protected
Neuse Riparian Buffers. Additionally, the developer is aware that deed restrictions will
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
August 23, 2007
ur:.M~~ _ ~~'t~~w ~A~iN S&EC Project # 10336.W5
,~~~„~~r~vD ~TOR!i~NATFR ~ DWQ No. # 07-0453v2

be required on all remaining streams, wetlands and protected riparian buffers to insure
that these features are protected in perpetuity.
2. Drawing S-2 shows the BMP as a dry detention basin, but the
worksheet submitted was for a wet detention basin.
The attached map correctly depicts the stormwater device as a wet pond.
3. Please describe the future phases of the development and the
associated percentage impervious cover.
The original submittal on July 5, 2007 included all phases of the proposed Panther Rock
Subdivision; however, those phases were not clearly labeled. Please see the attached
revised overall site plan which more clearly denotes phases 1, 2 and 3 of the proposed
subdivision. The anticipated impervious surface for the entire development is 28.7%, as
stated in the original Pre-Construction Notification application. Please see attached sheet
9 of 10, Section XI of the Pre-Construction Notification which has the anticipated
impervious surface breakdown.
4. Please provide detailed plans for the detention basin and the level
spreader. The level spreader worksheet states that a 56' level
spreader will be provided; however, the plan at the end of the
application shows a 13' level spreader. Please correct this
discrepancy.
Please see the attached design details for the level spreader and a corrected level spreader
worksheet. The original plan that showed a 13 foot level spreader was in fact correct and
the original worksheet was incorrect. The mistake has been corrected. Additionally, it
should be noted that since the anticipated velocities to the level spreader will not be
above 0.7 cfs, a bypass channel was not necessary.
Design details for the stormwater wet pond are not required for DWQ review as this
project meets with the Town of Knightdale's Phase II stormwater requirements. Per a
directive from Alan Klimek (formerly Director of DWQ) "If a local municipality has
been given delegated authority over the stormwater rules and has provided a written
approval of a project's stormwater plan, and that written approval is supplied to DWQ,
then DWQ does not need to approve the stormwater plan. " We are anticipating a letter
from the Town of Knightdale attesting to the proposed subdivision meeting with their
minimum stormwater requirements per the Phase II rules of their UDO and will forward

that letter to you once we receive it. Please find the attached stormwater details and
calculations that were supplied to and approved by the Town of Knightdale.
5. Please provide a signed and notarized operation and maintenance
agreement for the detention basin.
As stated in item No. 4 above, a DWQ stormwater management review is not required
and therefore, a signed and notarized O&M agreement for the proposed stormwater wet
pond is not necessary.
We assume that there are no other outstanding questions with regards to the issuance of
the requested 401 since no further information was requested. We are therefore
respectfully requesting that DWQ issue a 401 Approval for the Panther Rock Subdivision
development.
Please call if you have any questions or require further explanation.
Sincerely, ~-
Nicole J. Thomson
Regulatory Specialist
Attachments: 5 copies of Response letter
5 copies of Revised Overall Site Plan.
5 copies of Revised Level Spreader Detail
5 copies of Revised Level Spreader Worksheet
5 copies of Stormwater Wet Pond drawing
5 copies of Stormwater Calculations
CC: Mr. Jamie Shern (USAGE)
Ms. Lauren Witherspoon (NCDWQ Raleigh Regional Office)
Mr. Pablo Reiter, Terramor Communities, 6736 Falls of Neuse Rd, Suite 201, Raleigh, NC 27615
Mr. Howard D. Moye, III, Marlow &Moye, LLC, PO Box 20667, Raleigh, NC 27619

2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Zone* Impact
(s uare feet) Multiplier Required
Miti ation
1 7,750 3 (2 for Catawba) 23,250
2 5,000 1.5 7,500
Total 12,750 (0.29 Ac.) 30,750
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration /Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or .0260. Riparian buffer mitigation is not required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater
controls proposed in order to protect surface waters and wetlands downstream from the property. If
percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed
impervious level.
Quantity Area
s uare feet Area
(acres Proposed
Im envious
37' Roadways 1, 945 71, 965 1.65
27' Roadways 1,085 29,295 0.65
CuI-D-Sacs 4,420 4,420 0.10
Round-A-Bout 400 13,200 0.30
Sidewalk 5,740 28,700 0.66
Recreation Area 28,314 0.65
Lots 61 152,500 3.50
Total
Impervious Area 328,394 7.5 28'7%
(7.5 / 26.1)
Total Tract Area 26.1
Please refer to "Site Plan Information" and "Stormwater Pond Plan"for details. While
under construction, temporary, custom sedimentation basins will be installed outside of
the wetlands, streams, and riparian buffer areas to protect them against sedimentation
along with other aBpropriate sedimentation and erosion control measures in compliance
with the DWQ and Wake County Sedimentation and Erosion Control requirements. The
riparian area below the stormwater aond contains thick veaetation and nominal (4-8%)
slopes.
Page 9 of ] 0

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DWO Project No.
DMSION OF WATER QUALITY • LEVEL SPREADER WORKSHEET
L PROJECT INFO
Project Name :~
Contact Peson:_
Level Spreader ID:
Level Spreader Length
Drainage Area
Impervious Area
Ma~amum Filter Strip/Buffer Slope
grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter StripBuffer Vegetation
Pre-treatment or Bypass Method
II. REQUIRED ITEMS CHECKLIST
information):
Phone Number:
~ ft. (perpendicular to flow)
rT ac (on-site and off-site drainage to the level spreader)
-C~ ac. (on-site and off-site drainage to the level spreader)
_~% (6°~ for forested, leaf littler cover, 8% for thick ground cover)*
fl, cfs
S cfs
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. if a requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management
plan submittal includes a worksheet for each BMP, design calculations, plans and specfications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal
package will result in a request for additional information and will substantially delay final review and approval of the project.
A licant~ itials
Level spreader is at least 13 ft per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest
with leaf litter.
l~~tt Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
No structures are located in protected buffers.
~ Plan details for the bypass and outlets are provided.
~;dG The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25%
in areas with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This
potentially requires a minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone
1 of a protected buffer area.

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'~_ . _._..... .... .__._ - ~J-..... .. ..

0660 Pond Routing
0660 ~ 4/13/2007
Panther Rock- Phase 1 Pond Routing -1-Year Storm

Peak Flow = 1.1.6 _ Drawdown Orifice =
~ 3"
Time to Peak = 5 Riser Size = 2'x2'

Time (min) Inflow (cfs) Storage (cf) Stage (ft) Outflow (cfs)
0 0,0 p i 0 0
0
0.5 0.3 0 0
-- 0
8
--
1 1.1 8 0.00 0.0
33
--
-
1.5 2.4 41 0.01 OA
- 72
2 4.1 1 114 0.02 0:0
121 `~'
2.5 ' 5.8 234 ~ 0.05 0.1
- ~ 172
3 7.5 407 0.08.... 0.1
224
3.5 9.2 631 D.12 0.1
272
4 10.4 903 0.1 T 0.1
.310
4.5 11.4. 1214. 0:23. 0.1
338
5 11.6 1551 0.30 0.1
344
.....
5.5 11.4. , 1895 0.36
-- 0.1
-337
6 10.4 2232 0.42 0.2
- 309
6.5 9.9 2541 0.48- 0.2
291
-
7 8.6 2832 0.53 0.2
252
7.5 7.4 3084 :0.58 A.2
----
217
-
8 6.4 -
3301 0.62 0.2
- 186
8.5 5.6 , . 3487 0'.65 0.2
.:..161
9 4.9 3648 0.68 0.2
_140
- -
9.5 0.71
42 3789 0:2
1,99
10 ~ 3.6 3908 ~ 0.73
0.2
102
10.5 3.1 4010 i 0.75 0.2
--
~~ I 88

0660 Pond Routing
11 2.8 4098 0.77 ~ 0.2 ~
77
11.5 2.3 4175 0.78 0.2
63 I
12 2.1 4238 0.79 ; 0.2
56
12:5 1.7 4295 0.80 0.2
46
13 1.5 4340 0.81 0.2
39
13.5 1.3 4379 0.82 0.2
32
_
14 1.0 4411 0.82 0.2
25
14.5 0.8 4436 0.83 0.2
- 18
15 0.6 4454 0.83 0.2
11
15.5 0.3 4465 0.83 0.2

0660 Pond Routing
! 0660 4/13/2007 ~,
Panther Rock -Phase 1 Pond Routing -10-Year Storm
ppak Fi~u~ _ ~~ ~ Drawdown Orifice = 3"
:Time to Peak = 5 Riser Size = 2'x2'
i
__.
Time (min) Inflow (cfs) Storage (cf) Stage (ft) Outflow (cfs)
0 0.0 0 0 0
0
0.5 0.7 0 0 0
20
1 2.6 ' 20 0.00 0.0
79
1.5 5.8 98 0.02 DA
174
2 9.7 272 0.05 0.1
289
2.5 13.9 561 0.11 0.1
413 _ _
3 18.0 974 0:19 0.1
537 -
3.5 21.9 1514 0.29: 0.1
653 - -
-
-
4 24.9 2164 0.41 0.2
743
4.5 27.1 2907 0.55. 0.2
_ _.
__

' 809
------
_5 _
27.7 , 3717 0.70 0.2
-
-..825
5.5 -
27.1 4542 0.85 0.2'
808

6
24.9 __ ..
- 5349
1.00
0.2
741.
6:5 23.5 6090
. 1.13 0:3
' _
699.
7 20.5 6789 1.25 0.3
607:
7:5 17.7 7396 1:36
- 0.3
-
524 -
8 15.2
_ 7920 1.45 0.3
449 _
- --
- _:.
8.5 13.3 8368 1.52 0.3
.390
9 11.6 8758 1.59
0.3
:340
9.5 10.0 9098 1.65 0.3
290 '
10 8.6 9388 1.70 0.3
248
10.5 7.5 - 9637 1.74 0.3
215

0660 Pond Routing
11 , 6.6
- 9852 1.78 0.3
-- ---
'
190
11.5 5.5 10042 1.81 0.3
~ 157

12
5.0 _ _.
10198
1.83
0.3
140
-
12.5 4.2 10338 1.86 0.3

115 ___
13 3.6 10453 1:88 0.4
97
13.5 3.0 1.0550 1.89 0:5
77
14 2.5 10628 1.91 0.6
58
14.5 1.9 10686 1.91 D.6
39
15 1.4 10725 1.92 0.7
21
15.5 0.8 10746 1.92 0.7

0660 Pond Routing
0660.. --_ - __ _ __ _ 4/13/2007
Panther Rock- Phase 1 .Pond Routing - 100-Year Storm
-

'Peak Flow =
38.5 -
Riser Size = -
2'x2'
Time to Peak = 5 Em. Spillway 5' Width _ _j

Time (min) Inflow (cfs) Storage (cf) Stage (ft) Outflow (cfs)
0 0.0 0 0 0
~ 0
0.5 0.9 0 0 0
28
1 3.7 28 0.01 0.0
--
- 109
-
1.5 8.1 137 0.03 0.0
241
2 13.5 378 0.07 0.1
- -- 4
02
2.5 19.3 _
-' .781 0.15 0.1
575
3 25.0 1355. 0.26 0:1
747
3.5 30.4 2103 0.40 0.1
908
- _-
4 34.7 3011 0.57 0.2
-
1034 -
4.5 37.7 4045 0.76 _0.2
1126
5 38.5 5170 0.97 0.2
1148
5.5 37.7 6318 1.17 0.3
1124
6 34.7 7443 1.37 0.3
1031
6.5
: 32.7
- 8474 1.55 0.3
-- --
973
7 28:5
: 9447 1.71 0.3
_. _ _ 845'
:

7.5
24.6 _
-
10292
--
1.86
0.3
---
730
8 21.2 11022 1.98
- 1.3
596 .

8.5
18.5
11818 .
---
2.08
2.8
---_ _
472
__ .--
9 16.2 12089 2.15 4.2
361.
9:5 13.9 12450 2.21. 5.3
255: i
10 11.9 I 9 2705. 2.25 6.2
171
10.5 10.4 12876 2.28 6.9
__ 106.

0660 Pond Routing
11 9.2 12982 2.30 7.3
_
60
11.5 7.7 13042. 2.30. 7.5
7
12 6.9 13049 2.31 7.5
-17
-12.5 5.8 13032 2.30 7.4
-49 -- -
-
13 5.0 12983 " 2.29 7.2
-
-
-66 -
- 13.5 4.2 12917 2.28 7.0

- -81
14 ~
3.5 12835 2.27" 6.6
- - - -95
14.5 2.7 12740 2.25 6.3
__ -107
~
15 1.9 12633
-_ 2.24 5.9
_.._
-119
15.5 1.2 12514 2.22 5.4