20061347 Ver 1_More Info Received_20070308

Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
March 8, 2007
S&EC Project # 6442.W 1
DWQ Project # 06-1347
N.C. Division of Water Quality
401 Oversight and Express Permits Unit
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
RE: Response to the 18 October 2006 Request for More Information
Howard Farms; North Flat River [030401, 27-3-2, WSIII, NSW]
To Whom It May Concern:
On October 20, 2006, S&EC received a letter from your office regarding DWQ No. 06-1347 requesting
additional information to process the permit application. Specifically, your office cited deficiencies in our
application related to the following:
1. The level spreaders were designed using the 1 "/hour storm, however, you submitted worksheets for the old
design guidance. Please resubmit the calculations using the correct worksheet.
2. The maximum slope has been exceeded for level spreaders No. 1, No. 2, and No. 4. Please correct this
discrepancy and resubmit your level spreader worksheets and sheet plans as necessary.
3. You are using a Type B silt basin for a forebay. Please check to be sure the forebay is sized correctly and
resubmit using the correct worksheet
S&EC contacted Ian McMillan within three weeks of receiving the request to notify DWQ that the engineer
was working on a resolution to these issues. In response to these requests, you will find the attached
documents to contain revised drawings, bioretention calculations, and the signed and notarized O&M for the
BMP devices. In addition, the original proposed stream impacts have been reduced. I have attached revised
copies of pages 4, 5, 7 & 8 of the PCN for your review. If you require further information or would like to
discuss the project in detail; I can be reached at our office or by mobile at [phone]. '
Sincerely,
~:~- s~
Jason Payne
Environmental Scientist
Attachments: 1) Revised l lx 17 Drawings
2) Bioretention Calculations
3) Signed & Notarized Operations & Maintenance Agreement
4) Revised sheets 4 5 7 & 8 of PCN ~ ` "~
5) Cover Sheet, Plan Profile, & Detail Sheet Packet 11~ ~,A.,, ~" < `° -x ~E~~
<.
cc: Mr. Lin Cates ~~~~ J'~;!~,
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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]

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DWQ Project No.
DIVISION OF WATER QUALITY • BIORETENTION AREA WORKSHEET
I. PROJECT INFOR ATION (pl ase complete the following information):
Project Name : ~~y,.~s Sde6diyts.... - Ph.~ a
Contact Person: .S~uie~ emu; ~x Phone Number: (~3~) 330- 036
For projects with multiple basins, specify which basin this worksheet applies to: ~.2
Permanent Pool Elevation Sabo ft. (elevation of the orifice invert out)
Temporary Pool Elevation Sa/, S ft. (elevation of the outlet structure invert in)
Bioretention Surface Area a~806 sq. ft.
Drainage Area ~ 83 ac. (on-site and off-site drainage to the basin)
Impervious Area ft ~ ac. (on-site and off-site drainage to the basin)
Rational C Coefficient O• ~~-
Size % % (either 5% in w/sand under drain or 7% in w/o)
Inlet Velocity ~ 77 fps ~ ~~t,1y „3" / ~~"
Inlet flow depth /, 3 in
Depth to Ground Water u ~rt-•~ ft.
Planting Soil Infiltration Rate O-Sa in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate l~(.,~,~,,, in./hr. (the soil layer below 4 feet or below the sand bed)
II. REQUIRED ITEMS CHECKLIST
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 specifications 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.
Applicants Initials
SB No vertical sand bed is proposed
.S~ The bioretention area is at least 40 feet by 15 feet.
513 Sheet flow is provided at inlet.
~,/,~~~w., Water table depth is greater than 6 feet.
.SB Minimum of 6" ponding is provided.
S~ The ponded area will draw down in less than 4 days.
SIB Planting soil infiltration rate is greater than 0.52 in/hr.
Gt;,,Gr,G,,,~ ~,~~,~d The in-situ soil infiltration rate is greater than 0.2 inlhr,
SP A planting plan with species and densities is provided.
~~ Mulch layer is specified in plans.
S~ Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
S~ Plan details for the bioretention area provided.
Sg Plan details for the inlet and outlet are provided.
;>~ An operation and maintenance agreement signed and notarized by the responsible party is provided.
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

'w
DWQ Project No.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFOIZ~IATION lease complete the followin intormanonl:
Project Name : ~~ ~ar~ ~'.+~s SaL,~v-s ion - ~~sc ~
Contact Person: Sin ~S'a~~~1 Phone Number: (33~) 3~0 -os68
For projects with multiple basins, specify which basin this worksheet applies to: ~a
Permanent Pool Elevation
Temporary Pool Elevation
S~ .o ft.
.S~ . S ft.
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
Bioretention Surface Area
Drainage Area
Impervious Area
Rational C Coefficient
Size
Inlet Velocity
Inlet flow depth
Depth to Ground Water
Planting Soil Infiltration Rate
In-Situ Soil Infiltration Rate
II. REQUIRED ITEMS CHECKLIST
S 3~ sq. ft.
~ ac.
t, 6 ac.
~~--
S`
/, ~ fps
j, J in .:
G(.~k.~ow., ft.
U'.S2 in./hr,
~! , ,~ ,~w~ in.lhr,
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(either 5% in wlsand under drain or 7% in wlo)
r~~~~s,,~y ~ / ,~
(the soil layer down to 4 feet)
(the soil layer below 4 feet or below the sand bed)
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 specifications 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.
Applicants Initials
S T~ No vertical sand bed is proposed
57~ The bioretention area is at least 40 feet by 15 feet.
Sg Sheet flow is provided at inlet.
Gf~,~,r,.w„ Water table depth is greater than 6 feet.
SI3 Minimum of 6" ponding is provided.
S The ponded area will draw down in less than 4 days.
S L~ Planting soil infiltration rate is greater than 0.52 'Inlttr.
~.~~~~~~n ~~.~!` The in-situ soil infiltration rate is greater than 0.2 in/hr.
~'%; A planting plan with species and densities is provided.
.. ~ Mulch layer is specified in plans.
ment
t M
~;,~~' _ anage
Planting soil meets minimum soil specifications (NCDENR stormwater Bes
Practices Manual, April 1999)
-~' Plan details for the bioretention area provided.
~' _ Plan details for the inlet and outlet are provided.
ned and notarized by the responsible party is provided.
t si
S1~ g
An operation and maintenance agreemen
Please note that underdrains beneath the planting soil are acceptable in the Piedmont and Mountains

`r
Bioretention Area Worksheet Addendum
Howard Farms Subdivision -Phase 2
Bioretention Areas #1 and #2
The depth to groundwater and in-situ soil infiltration rates at the two bioretention areas
have not been determined. The bioretention areas have been designed with gravel and
pipe underdrains. The underdrain pipes daylight approximately above the adjacent creek
banks.

HOWARD FARMS SUBDIVISION
PERSON COUNTY
BIORETENTION AREA CALCULATIONS
FOR:
Howard Farms of Person County, LLC
303 Salem Church Road
Hurdle Mills, NC 27541
February 19, 2007
Revised March 7, 2007
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Calculations By: Steven P. Bailey, PE
Coulter Jewell Thames. P.A.
Main Office Engineering Branch Office
111 West Main Street 212 South Lamar Street
Durham, NC 27701 PO Box 1086
Ph: 919-682-0368 Roxboro, NC 27573
Fax: [phone] Ph: 336-330-0368
Fax: [phone]

Narrative
The purpose of this project is to construct the subdivision road infrastructure for a
portion of the Howard Farms subdivision in Person County, North Carolina. The
infrastructure will include a public subdivision road constructed to NCDOT standards.
The road will have a pavement width of 18' and end in a cul-de-sac.
The project site is approximately 8 miles south of Roxboro in Person County. A
Vicinity Map showing the project location has been included on the Cover Sheet of the
Plans. Soils on the site are primarily Hydrologic Soil Group B. The site is located in the
Neuse River Drainage Basin.
Work on this project will include grading, road construction and installation of
required storm drainage pipes. Sediment and erosion control devices are shown on the
Plan and Profile Sheets. The Plan and Profile Sheets provide the profile of the centerline
the proposed roads. Erosion control devices include a temporary construction entrance,
erosion control matting, check dams and silt fence. The side ditches along the road have
been designed using temporary and permanent linings that will prevent erosion during the
10-year storm event.
Two bioretention areas are proposed to filter stormwater runoff from the roadside
ditches. The bioretention areas have been designed by the 1999 NCDWQ BMP Manual.
Bypass channels will route larger storms around the bioretention areas.

Bioretention Area #1
Draiange Area 2.83 ac
Impervious Area 0.62 ac
Impervious C 0.95
Pervious C 0.3
Composite C 0.44
Required Surface Area 0.063 ac (5%xCxDA)
2727 sf
Design Length ft
Design Width ft
Design Surface Area 2806 sf
Bioretention Area #2
Draiange Area 3.6 ac
Impervious Area 0.66 ac
Impervious C 0.95
Pervious C 0.3
Composite C 0.42
Required Surface Area 0.075 ac (5%xCxDA)
3287 sf
Design Length 32 ft
Design Width 105 ft
Desi n Surface Area 3360 sf

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Bio retention area #1 entrance (1=1"/hr)
Worksheet for Trapezoidal Channel
Project Description
Project File c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Worksheet Bio Area #1 entrance
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030
Channel Slope 0.005000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 15.00 ft
Discharge 1.25 cfs
Results
Depth 0.11 ft
Flow Area 1.62 ftZ
Wetted Perimeter 15.67 ft
Top Width 15.63 ft
Critical Depth 0.06 ft
Critical Slope 0.0337 26 ft/ft
Velocity 0.77 fUs
Velocity Head 0.01 ft
Specific Energy 0.12 ft
Froude Number 0.42
Flow is subcritical.
FlowMaster v5.15
03/07/07 Page 1 of 1
09:33:45 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]

Bio retention area #2 entrance (I=1 "/hr)
Worksheet for Trapezoidal Channel
Project Description
Project File c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Worksheet Bio Area #2 entrance
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030
Channel Slope 0.025000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 10.00 ft
Discharge 1.51 cfs
Results
Depth 0.09 ft
Flow Area 0.96 ft2
Wetted Perimeter 10.59 ft
Top Width 10.56 ft
Critical Depth 0.09 ft
Critical Slope 0.029798 ft/ft
Velocity 1.58 ft/s
Velocity Head 0.04 ft
Specific Energy 0.13 ft
Froude Number 0.92
Flow is subcritical.
FlowMaster v5.15
03/07/07 Page 1 of 1
09:33:24 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]

Channel to Bioretention #1
Worksheet for Trapezoidal Channel
Project Description
Project File c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Worksheet CHANNEL TO BIO #1
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030
Channel Slope 0.021000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 3.00 ft
Discharge 10.22 cfs
Results
Depth 0.56 ft
Flow Area 2.62 ftZ
Wetted Perimeter 6.54 ft
Top Width 6.36 ft
Critical Depth 0.58 ft
Critical Slope 0.0181 16 ft/ft
Velocity 3.90 ft/s
Velocity Head 0.24 ft
Specific Energy 0.80 ft
Froude Number 1.07
Flow is supercritical.
FlowMaster v5.15
02/19/07
10:17:30 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1

Bioretention #1 Bypass
Worksheet for Trapezoidal Channel
Project Description
Project File c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Worksheet BIO #1 BYPASS CHANNEL
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030
Channel Slope 0.120000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 3.00 ft
Discharge 10.22 cfs
Results
Depth 0.35 ft
Flow Area 1.42 ft2
Wetted Perimeter 5.22 ft
Top Width 5.10 ft
Critical Depth 0.58 ft
Critical Slope 0.0181 16 ft/ft
Velocity 7.20 ft/s
Velocity Head 0.81 ft
Specific Energy 1.16 ft
Froude Number 2.41
Flow is supercritical.
02/19/07 FlowMaster v5.15
10:36:02 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1

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Bioretention #2 Bypass
Worksheet for Trapezoidal Channel
Project Description
Project File c:\cjt\projects\0632 howard farm\eng\culvert.fm2
Worksheet BIO #2 BYPASS CHANNEL
Flow Element Trapezoidal Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030
Channel Slope 0.067000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Bottom Width 2.00 ft
Discharge 10.92 cfs
Results
Depth 0.50 ft
Flow Area 1.75 ft2
Wetted Perimeter 5.16 ft
Top Width 5.00 ft
Critical Depth 0.69 ft
Critical Slope 0.017822 ft/ft
Velocity 6.24 ft/s
Velocity Head 0.60 ft
Specific Energy 1.10 ft
Froude Number 1.86
Flow is supercritical.
02/19/07 FlowMaster v5.15
10:57:06 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone] Page 1 of 1

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02/19/2007 18:4 FAX [phone] Coulter Jewell Thames
HOWARD FARMS SUBDIVISION
PERSON COUNTY, NC
lQ 002/00
ORIGINAL COPY
BIORETENTION AREA QPERATION AND MAINTENANCE AGREEMENT
BIORETENTION AREAS #1 AND #2
The bioretention area system is defined as the bioretention area, inlet and outlet areas, and the vegetated
filter if one is provided.
Maintenance activities shall be performed as follows
1, At least twice per year.
a. Inspect for erosion around the facility, sedimentation deposits, trash, and debris.
b. After a rain event, verify that the bioretention area is functioning properly by allowing stormwater to
filter through the planting soil. Water should not be ponded more than ~ days after the end of a storm.
c. Inspect mulch layer for void areas.
d. Inspect shrubs and trees for death and disease.
2, Repair eroded areas immediately, re-seed as necessary to maintain good vegetative Cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed, Remulch any
void areas. Remove and replace dead or diseased vegetation.
3. If water remains ponded more than 4 days after a rain, remove mulch layer and portion of planting soil
that has been clogged with sediment. Replace planting soil and mulch that is removed,
4. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
5. All Components of the bioretention area system shall be maintained in good working order.
6. Maintain the grassed inlet and overflow areas. inspect for erosion and sedimentation at least twice per
year. Any erosion to these areas or down gradient erosion must be repaired and/or replanted as
necessary.
Page r of 2

02/19/2007 18:94 FAX [phone] Coulter Jewell Thames
~ 009/000
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print name: Marie Cates MemberlManaaer of Howard Farms of Person County. LLC
Title: Member/Mana er
Address: 303 Salem Church Road Hurdle Mills NC 27541
Phone: [phone]
Signature: ~~~ ~ r!~~/.T~,..~, ~~- ~~^"-` p
Date: ~ - 2a - d 7
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 preside`'nt~F.
I .~l-~ ~ ~r~ C . 'f-{~ c~~ s , a Notary Public for the State of ~ oY T"` ~~ ~' r~--
County of ~-~- s o r , do herd by certify that m~-~' ~ ~~ . C~~" e S _
personally appeared before me this ~- ° 'day of t-e~ ~'~-~ `~ ~° '1 ~ and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
q
1 ~ '~~
~-' ,
N~~a ~v` 6 ~,`~
SEAL ~ ~ ~~~~~~
My commission expires
Page 2 of Z

should be shown on a delineation map, whether or not impacts are proposed to these systems.
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:
The proposed road construction will result in approximately 106 linear feet of
important, perennial stream in Person County, NC.
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,
senarately 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

Total Wetland Impact (acres) 0
3. List the total acreage (estimated) of all existing wetlands on the property:
No wetlands were identified on the site during the preliminary evaluation.
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
1 UT North Flat River Road Crossing Perennial 15' 106 0.080
Total Stream Impact (by length and acreage) 106 0.080
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

Total Open Water Impact (acres) 0
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6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Im act (acres): 0.080
Wetland Impact (acres): 0
O en Water Im act (acres): 0
Total Im act to Waters of the U.S. (acres) 0.080
Total Stream Impact (linear feet): 106
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.
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.):
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.):
Current land use in the vicinity of the pond:
Size of watershed draining to pond: Expected pond surface area:
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It maybe 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.
The property is bisected from the northeast to the southwest by a large, perennial
stream. Due the configuration of the stream on the site in proximity. to the
property boundaries and adjacent points of ingress and egress, a road necessary
to access the northern portion of the site could not be constructed without
crossing the stream. The client has avoided impacts to other streams on-site and
cannot avoid the crossing proposed in this application.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
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IX. Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ^ No
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ^ No ^
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ^ No ^
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify: Meuse )? Yes ®No ^
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.
Road Crossing
Zone* Impact
s uare feet Multiplier Required
Miti ation
1 4,151 3 0
2 3,085 1.5 0
Total 7,236 0
Bioretention Area #1
Zone* Impact
s uare feet Multiplier Required
Miti ation
1 722 3 0
2 502 1.5 0
Total 1,224 0
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Bioretention Area #2
Zone* Impact
s ware feet Multiplier Required
Miti ation
1 132 3 0
2 98 1.5 0
Total 230 0
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
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.
Because the buffer impacts proposed are allowable within the regulations and
below the thresholds for buffer mitigation, we do not believe mitigation should
be 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.
The proposed development consists of two phases of construction; the first
phase (lots 1-24) did not require 404/404 permit authorization, as no impacts
occurred. The second phase (lots 25-39) will require permit authorization for
completion. The percent impervious surface for the development has been
broken down by phase for review:
Lots 1 - 24: Roads: 0.72 acres
Houses: 2400 sf/lot = 1.32 acres
Driveways: 1500 sf/lot = 0.83 acres
Total 2.88 acres
Total area 38.10 acres
impervious = 7.6%
Lots 25 - 39: Roads: 0.61-acres
Houses: 2400 sf/lot = 0.83 acres
Driveways: 1500 sf/lot = 0.52 acres
Total 1.96 acres
Total area 25.30 acres
impervious = 7.7%
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