20060352 Ver 1_More Info Received_20060504

~ • Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, orth Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
Z
May 4, 2005
`' S&EC Project #SOOS.WO
~~ ~ DWQ Project #06-0352
Department of Environment and Natural Resources
Division of Water Quality ~ j ~ j
Attn: Cyndi Karoly ~_ ~ -
,~_,.
2321 Crabtree Boulevard ~~"
Suite 250
Raleigh, NC 27604
Re: Reply to the Division of Water Quality's Request for More Informati D ~ ~ ~ ~~~ D
Twelve Oaks Subdivision ~,~~~ 4 ~Q~~
Holly Springs, Wake County, NC
p~~K _ w~-r~a ~uALMrr
~~ s~c~n nwwcrl
Dear Ms. Karoly:
The purpose of this letter is to complete our response to your Request for More Information letter
requesting further information. On Apri17, 2006, S&EC provided further information on
questions #'s 1, 2, 3 & 6, this response will provide additional information for questions #'s 4 &
5. The original questions/requests are copied below as they appear on the March 15, 20061etter
and are then followed by our response to each.
Additionallnformation Requested:
4. Please specify the percent of the project imperviousness area based on estimated built
out conditions and provide an inventory of all impervious surfaces (building footprints,
roads, driveways, decks, sidewalks, gravel-covered areas, etc.).
The project imperviousness is estimated to be 19.3% (see attached breakdown).
S. This office believes that the wetland impact labeled on the plans as Impact Area 22 can
be moved or reconfigured to avoid the impacts to wetland: Please revise the plans to
avoid the impact.
From additional detailed planning, it seems that Impact Area #22 has increased due to fill slopes
needed along the cul-de-sac. In addition, Impact Area #16 has also increased due to accurate fill
slope details (see attached revised PCN sheets 4, 5, 6 & 7).
We anticipate that this answers all of the DWQ's questions in order to complete the final review
process fora 401 Water Quality Certification. If you have any further questions or any additional
explanation is needed, please don't hesitate to call.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]

Sincerely,
,/ ~ ~ -~
~~~~~
Sean Clark
Environmental Specialist
CC:
Mr. Monte Matthews (USAGE)
Attachments:
1) Impervious Area Estimation
2) PCN pages 4, 5, 6 & 7
3) Revised Impact Maps (2)
May 4, 2006
S&EC Project # SOOS.WO
2

Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts: Proposed permanent impacts
include only 0.125 acres of wetlands, 263 linear feet of perennial stream channel, and 668
linear feet of intermittent stream channel. Proposed temporary impacts include 353 linear
feet of perennial stream channel and 319 linear feet of intermittent stream channel.
Permanent stream channel impacts are due to road crossings. Permanent wetland impacts are
due to road crossings, driveway crossings, and fairway fill. Temporary impacts are due to
the sewer line installation.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
separately list impacts due to both structure and flooding.
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year Nearest Impact
(indicate on map) herbaceous, bog, etc.) Floodplain Stream (acres)
es/no (linear feet
3 (NWP 39) Road Crossing Herbaceous No +/- 50' 0.007
9 (NWP 39) Golf Course fill Herbaceous No +/- 10' 0.039
13 (NWP 39) Road Crossing Herbaceous No +/-175' 0.008
14 (NWP 39) Road Crossing Herbaceous No +/- 960' 0.004
22 (NWP 39) Road fill/Driveway Herbaceous No +/- 450' 0.013
Crossing
27 (NWP 18) Golf Course fill Herbaceous yes +/- 300' 0.046
(old farm ditch)
33 (NWP 12) Sanitary Sewer Herbaceous No +/- 150' 0.006
34 (NWP 12) Sanitary Sewer Herbaceous Yes +/- 300' 0.002
Total Wetland Impact (acres) 0.125
List the total acreage (estimated) of all existing wetlands on the property: +/- 8 acres
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.
Stream Impact
Perennial or Average Impact Area of
Number Stream Name Type of Impact
Intermittent? Stream Width Length Impact
(indicate on ma) Before Im act (linear feet) (acres)
Page 4 of 11

1 UT to White Oak Road Crossing Intermittent 1' - 2' 198 0.009
(NWP 39) Creek
2 UT to White Oak Road Crossing Intermittent 2' -3' 86 0.005
(NWP 39) Creek
3 UT to White Oak Road Crossing Intermittent 2' - 3' 73 0.004
(NWP 39) Creek
4 UT to White Oak Road Crossing Intermittent 3' - 4' 138 0.011
(NWP 39) Creek
x/
5
(NWP 39) UT to Little Branch Road Crossing Perennial 1' - 2' 84 0.003
6 UT to White Oak Sanitary Sewer
Perennial ,
5 - 6
23
0.003
(NWP 12) Creek p~~y).
7`~ e

(NWP 39) UT to Little Branch Road Crossing Per
1 4' - 5' 95 0.010
7B
UT to Little Branch Sanitary Sewer
Perennial
4' - 5'
35
0.004
(NWP 12) ~~~)
8 UT to White Oak Road Crossing Perennial 5' - 6' 84 0.011
(NWP 39) Creek
10 UT to White Oak Sanitary Sewer
Perennial ,
6 - 7
23
0.004
(NWP 12) Creek ~Lemhorary) s
11 UT to White Oak Sanitary Sewer Intermittent 2' - 3' 20 0.001
(NWP 12) Creek orary)
12 UT to White Oak Sanitary Sewer Intermittent 1' - 2' 42 0.002
(NWP 12) Creek ~~st~orary)
13 UT to White Oak Road Crossing Intermittent 4' - 5' 107 0.012
(NWP 39) Creek
15 UT to White Oak Road Crossing- Intermittent 2' - 3' 18 0.001
(NWP 39) Creek grading fill
16 UT to White Oak Road Crossing Intermittent 3' - 4' 35 0.003
(NWP 39) Creek
17 UT to White Oak Road Crossing Intermittent 2'-3' 13 0.001
(NWP 39) Creek
18A UT to White Oak Sanitary Sewer
Perennial ,
4 - 5
38
0.004
(NWP 12) Creek ,3~'~'Y)
18B UT to White Oak Sanitary Sewer Intermittent 2' - 3' 78 0.004
(NWP 12) Creek ~iporary)
Page 5 of 11

19 UT to White Oak Sanitary Sewer Intermittent 2' - 3' 38 0.002
(NWP 12) Creek ~orary)
20 UT to Little Branch Sanitary Sewer Intermittent 1' - 2' 21 0.001
(NWP 12) >~orary)
21 UT to Little Branch Sanitary Sewer perennial 2' - 3' 25 0.002
(NWP 12) '~(~~ry)
(NWP 12) UT to Little Branch S{hemp rte) r Perennial 4' - 5' 30 0.003
WP UT to Little Branch Sanitary S
w) r
e Intermittent 1'-2' 46 0.002
(N
)
12 ~
ry
WP UT to Little Branch Sanit~) r, Intermittent 1'-2' 21 0.001
)
(N
12
26 Little Branch Sanitary Sewer perennial 12'-13' 28 0.008
(NWP 12) ;'nPbirarY)
28 UT to Little Branch Sanitary Sewer perennial 5'-6' 21 0.003
(NWP 12) "~~-'~'Y)
29 UT to White Oak Sanitary Sewer Intermittent 2'-3' 31 0.002
(NWP 12) Creek pq~pszrary)
30 UT to White Oak Sanitary Sewer Intermittent 2' 22 0.001
(NWP 12) Creek ~,iorary)
31 UT to White Oak Sanitary Sewer perennial 3'-4' 21 0.002
(NWP 12) Creek (~mparary)
32 UT to White Oak Sanitary Sewer
` perennial 1'-2' 31 0.001
(NWP 12) Creek (1l~porary)
35 UT to White Oak Sanitary Sewer perennial 6'-7' 78 0.012
12
(NWP ) Creek
l,~t~ta~porary)
Total Stream Impact (by length and acreage) 1,603 0.132
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact
Name of Waterbody Type of Waterbody Area of
Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
indicate on ma ocean, etc. acres
N/A N/A N/A N/A N/A
Total Open Water Impact (acres)
Page 6 of 11

6. List the cumulative im act to all Waters of the U.S. resultin from the ro'ect:
Stream lm act (acres): 0.132
Wetland Im act (acres): 0.125
O en Water Im act (acres): 0
Total Im act to Waters of the U.S. (acres) 0.257
Total Stream Impact (linear feet): 1,603
7. Isolated Waters
Do any isolated waters exist on the property? ^ Yes ®No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
There are no isolated wetland or stream impacts on this property.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Current land use in the vicinity of the pond: N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
This nronosed subdivision and golf course has been desicned and re-desisned several times
to avoid unnecessary stream and wetland impacts resulting from lot fill or unnecessary road
alignments. Out of the +/- 687 acres there are on1~3 perennial stream crossingproposed, all
others are intermittent at near perpendicular angles.
VIII. Mitigation
Page 7 of 11

SPAULDING & NORRIS PA
Civil Engineering & Planning
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