20061949 Ver 1_More Info Received_20061214

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Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com
December 14, 2006
S&EC Project #10535.W1
Department of Environment and Natural Resources
Division of Water Quality
Attn: Cyndi Karoly
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604
Subject: Brookfield Subdivision, Lot #45
65 Bethany Lane, Youngsville, Franklin County, NC
Dear Mrs. Karoly:
On December 5, 2006, Mr. Joe Procopio Jr. and I met with you to discuss the proposed Major Variance request that
is scheduled to be presented and reviewed by the Environmental Management Commission on January 10, 2007. To
meet this deadline it was requested of you that I submit the project title and description to you by December 14,
2006, along with the conceptual water quality bio-retention plan and riparian buffer restoration plan for the subject
site.
Please review the attached documents, if this information is acceptable or if revisions are needed, please email me at
dedwardsCa~sandec.com. After your review and approval of the attached, it is my intentions to have 18 hard copies
and one electronic copy of the application package and supplemental information to you by December 19, 2006.
Sincerely,
Debbie Edwards
Environmental Specialist
Attachments:
1) Title and Description
2) Property Survey
3) Preliminary Design Calculations & Concept Plan for Rain Garden and Riparian Restoration
Charlotte Office: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Law~}dale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]

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Request for Consideration of Major Variance to the Tar-Pamlico River Riparian Buffer
Protection Rule [2B .0259 (9) (c)J
Project Title:
Brookfield Subdivision, Lot 45
65 Bethany Lane, Youngsville, NC
Project Description:
This major variance request is fora 1,300 ft2 single family residence that is of median range for
an existing neighborhood, Holden Farms. Holden Farms is located just east of Youngsville,
Franklin County, North Carolina. This 0.34 acres lot is bisected by an unnamed tributary to
Brandy Creek (B, NSW), of this 0.34 acre lot, approximately 65% is riparian area.
The amount of requested impervious surface in Zone 1 is 160 ft2 with an additional requested
amount of impervious surface in Zone 2 of 814 ft2. Along with this impervious surface request is
an additional amount of area within Zone 1 to be maintained in grass, 1207 ft2, this is a 10' wide
side yard immediately adjacent to the structure to prevent the growth of large trees directly
against the structure.
The property owner, Mr. Joseph Procopio, Jr. isproposing a bio-retention area to treat the new
impervious surface areas for water quality protection. In addition, Mr. Procopio proposes
payment into the Ecosystem Enhancement Program for the proposed impervious surface area
within Zones 1 & 2, in addition to restoring the first 20' of the Zone 1 riparian area with trees
and shrubs.

IMPERVIOUS SURFACE TABLE SURVEY FOR
NDI~sE 1,006 SF.
PATIO 28 SF.
DPoVEWAY/SIDEWALK 020 SF.
TOTAL IMPERVIOUS AREA ,,as6 SF. JOE PROCOPPIO
TOTAL LOT AREA 1'5,024 SF.
PERCENTAGE OFIMPERNOUS AREA 1286%
ZONE 1-NET15E RIVER RIPARIAN BUFFER
rnuc~~ ,DEac- 16o s.F. LOT 45, BROOKFIELD SUBDIVISION
10' soE YARD BETHANY LANE ~~'
TO ~ MNNTNNED 1207 SF.
TOTAL AREA IMPACTED ZONE 1- 1,367 S.F. PIN # 1863-35-3596
ZONE 2-NEUSE RIVER RIPARIAN BUFFER D.B. 1498, PG. 54
smicn;~ CRETE, ETC.. • m4 S.F. VICINITY MAP
M.B. 2000, PG. 122
YARD TO BE MNNTNNED - 762 S.F.
TOTAL AREA wPACIED ZONE z< 1,s76 s.F. YOUNGSVILLE TOWNSHIP LEGEND:
TOTAL AREA IMPACTED FRANKLIN COUNTY, NORTH CAROLINA EIP -EXISTING IRON PIPE
NEUSE RIVER RIPARIAN EPK -EXISTING PK NAIL
BUFFER x,943 SF DECEMBER 4, 2006 NIP -NEW IRON PIPE SET
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R/W -RIGHT OF WAY
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CAWTHORNE, MOSS
& PANCIERA, P.C.
Professional Land Surveyors
239 E. Owen Ave.
Post Office Box 1253
Wake Forest, N.C. 27588
[phone]

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1 DECLARE THAT THIS SURVEY COMPLIES WITH THE NORTH
CAROLINA STANDARDS OF PRACTICE fOR SURVEYING,
(SECTION 1800) FOR CLASS A SURVEYS AND THAT THE
CALCULATED RATIO OF PRECISION BEFORE ADJUSTMENTS
IS 1:10,000+. FURTHERMORE, PROPERTY CORNERS SHOWN
ARE PRIMARY CONTROL MONUMENTAl10N FOR THE RE-
ESTABLISHMENT OF PROPERIY CORNERS IN THE ABSENCE
OF GRID MONUMENTS AND OTHER SUBDIVISION PROPERTY
CORNERS. 7HIS SURVEY IS NOT TO BE RECORDED WITH-
OUT THE WRITTEN AUTHORIZATION OF THE SURVEYOR.
PROFESSIONAL LAND SURVEYOR L-

PRELIMINARY DESIGN CALCULATIONS
& CONCEPT PLAN
RAIN GARDEN DESIGN
FRANKLIN COUNTY, NORTH CAROLINA
Prepared for:
Imperial Custom Homes, Inc.
Youngsville, NC 27596
December, 2006
S&EC Project No. 10535.D1
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Soil & Environmental Consultants, PA
11010 Raven Ttidge Road Raleigh, North Carolina 27614 Phone: [phone] Fax: [phone]
www.SandEC.com

Soil & Environmental Consultants, PA S&EC Project No 10535.D1
Procopio Property December 2006
Project Location
The project is located within the Town of Youngsville, in Franklin County, NC. The
property is owned by Imperial Custom Homes and consists of approximately 0.34 acres
located on the east side of Bethany Lane approximately 100 feet northeast of the
intersection of Bethany Lane and Holding-Young Road. See Figures 1, 2, and 3.
Storm Water Treatment
Treatment of stormwater runoff has been required by the Division of Water Quality
(DWQ) as part of the permitting requirements for impacts to the existing buffers
associated with this project. A significant portion of the structure and an attached deck
are located within the buffer (Zones 1 and 2). See Figure 3.
The concept plan calls for the construction of a single rain garden to be located on the
property. This rain garden will serve to treat stormwater runoff associated with the
impervious area including roof, sidewalk, and driveway.
Our preliminary evaluation of this feature has included device sizing for the removal of
Total Suspended Solids (TSS) reduction in accordance with generally accepted practice
as outlined in the North Carolina Department of Environment and Natural Resources
(NCDENR), Division of Water Quality (DWQ), Best Management Practices (BMP)
Manual (April 1999) and other applicable references.
Total Suspended Solids (TSS) and Total Nitrogen (TN) Removal
The BMP manual outlines design requirements necessary to meet the pollutant removal
design standard of 85 percent removal of Total Suspended Solids (TSS). Based on the
BMP manual, a rain garden is assumed to have a TSS removal efficiency of 85 percent.
Sized appropriately, a rain garden will meet the removal requirements for the residence
and other site impervious areas.
Constructed properly, rain gardens also contribute significantly to the removal of Total
Nitrogen. According to the Draft BMP Stormwater Manual from the N.C. Division of
Water Quality (DWQ), dated July 2005, and "Updates to Stormwater BMP Efficiencies"
Memo from DWQ, dated September 8, 2004, rain gardens are currently considered to
remove 35 percent of the TN from storm water inflow. And although it is our
understanding that no formal nitrogen removal evaluation is necessary, the use of rain
gardens will clearly provide considerable benefits to the quality of the surface water
reaching the receiving watercourse.
1 of 3

Soil & Environmental Consultants, PA
Procopio Property
Bioretention Area Planning & Design
S&EC Project No 10535.D1
December 2006
Preliminary calculations for the sizing of the total footprint of the rain garden have been
performed. All necessary preliminary storm water design calculations and supporting
documentation are attached.
From available site data provided by Cawthorne, Moss & Panciera, P.C. The rain garden
was sized to treat the rooftop, driveway, and sidewalk runoff. Using the methods
described in the BMP Manual we determined the required surface area for the rain garden
needed to treat site runoff (assuming 7% - no sand bed). Whenever possible, the
minimum length, width, and length to width ratio (and other sizing criteria) as described
in the BMP manual will be met or exceeded during final design.
For planning purposes, we have recommended that the Owner consider a total
construction area of 1.5 times the design surface area footprint required for the proposed
rain garden. This area will be integrated into the site landscaping plan to provide the
desired appearance. We have attached the required DWQ Worksheet for the proposed
rain garden. The following table provides a summary of our preliminary design results:
Total Impervious Weighted Required Rain Recommended
Area Rational Garden Area Construction Area
sq.ft. (ac.) Coefficient (sq. ft.) (sq. ft.)
1,936 (0.044) 0.95 255 383
Based on our previous discussions with the Division of Water Quality, we understand
that once treated for TSS storm water from a rain garden can be discharged directly into
the receiving watercourse (in this case the immediately adjacent stream). However, the
discharge must be non-erosive.
Once approval of this Concept Plan is received and the buffer variance is granted, a Final
Design including detailed Construction Drawings and Technical Specifications will be
prepared. The exact location and dimensions for the rain garden will be described in
detail in the final construction documents. Detailed design of the rain garden to include
but not limited to inflow distribution, treatment soil characteristics, ponding depth, outlet
structure sizing, and feature elevations will be determined during Final Design. Certain
planning assumptions have been made with regard to the collection of impervious area
runoff and the proposed discharge points. These assumptions will be confirmed during
Final Design and, if necessary, plans will be modified to meet regulatory requirements.
An Operations and Maintenance (O&M) Agreement will also be prepared at that time.
2 of 3

Soil & Environmental Consultants, PA
Procopio Property
List of Attachments and Figures
Attachments:
Preliminary Storm Water Calculations
Division of Water Quality Bioretention Area Worksheet
Figures:
Sheet 1 -Cover, Contents, & Vicinity Map
Sheet 2 -Overall Site Plan
Sheet 3 -Rain Garden Layout & Proposed Buffer Restoration
Sheet 4 -Planting Schedule & Planting Details
S&EC Project No 10535.D1
December 2006
4 pages
1 pages
3 of 3

PROCOPIO PROPERTY -RAIN GARDEN SIZING CALCULATIONS
Project Number: 10535.D1
Rain Garden Sizing
1. Runoff Depth, D = [(P-0.2`S)2]/[(P+0.8*S)], in
P =Precipitation (usually 1 inch)
S = [1000/CN]-10
CN = 98.0
S = 0.2
P = 1 inch
D = 0.791 inch
2. Runoff Volume , VR = A''D, (ft3)
A =Impervious Area (ft2)
D =Runoff depth (in)
A = 1936 ft2
D = 0.791 in
VR = 127.6 ft
3. Bioretention Surface Area , SA = VR/H, (ft2)
VR =Runoff volume (ft3)
H =Average depth of water, (optimal 6 inches)
VR = 127.6 ft3
H = 6 in
SA = 255.2 ft
Underdrain Sizing
1. Fill Soil Choice
Nitrogen Removal -Sandy Loam
K= 1 in/hr Soil Type: 12% Fines (Silt+Clay), 82-85% Sand, 3-6% Organic
Other Pollutant Removal -Loamy Sand
K= 2 in/hr Soil Type: 8% Fines (Silt+Clay), 86-90% Sand, 2-4% Organic
K= 1 in/hr
2. Minimum Flow, QMin = K * A"`(1/43200), (cfs)
Assumes ~H/L = 1.0
K =Fill soil choice (in/hr)
A =Bioretention surface area (ft2)
K = 1 in/hr
A = 255.2 ftz
QMin = 0.0059 CfS
3. Design Flow, QD - QMin * FS, (cfs)

QMin =Minimum flow, (cfs)
FS =Factor of safety (range between 2 and 10)
QMin = 0.0059 Cfs
FS = 2
Qp = 0.0118 cfs
4. Pipe Diameter, d = 16"[(Qo*n)/s0~5]~3~8~, (in)
Qp =Design flow, (cfs)
n = Manning's roughness coefficient
s =internal slope (recommended minumum 0.005 ft/ft)
Cep = 0.0118 cfs
n = 0.011 for smooth wall
s = 0.005 ft/ft
d = 1.51 inches
use d = 2.0 inches
5. Number of Pipes
Equivalent Pipe Diameters
D (in) No. of 4" diam
5.13 2
5.95 3
6.66 4
7.22 5
7.75 6
8.2 7
d = 2.00 inches
# of 4"diameter pipes = 2
Equivalent Pipe Diameters
D (in) No of 6" diam
7.84 2
9.11 3
10.13 4
# of 6" diameter pipes = N/A
Calculating Drawdown
1. Ponded Volume, Vp =Runoff Volume, VR
Vp = 127.6 ft
2. Time to Drain Ponding Zone , Tp = Vp /QMin (hr)
Vp =Ponded volume, (ft3)

Quo = 10-year flow, (cfs)
CWe1f =Weir coefficient
H =Height of water above weir, typically 2 (in)
Qio = 0.853 cfs
Cwefr = 3 for sharp-crested
H = 2 in
Lwe;~ = 4.18 feet
3. Outlet Size
1 side square outlet =Weir Length / 4
Lweir = 4.18 feet
Lwei~ = 50.15 inches
1 side = 12.54 inches
Square Dimensions:
12.54 x 12.54 inches
use 15 x 15 inches or larger
Sizing Outflow Pipe
1. Outflow Pipe Diameter, D~,ii = 16"[(Q~o"n)/Js]~3~8~, (ft)
Quo = 10-year flow, (cfs)
n = Manning's roughness coefficient
s =internal slope (recommended minumum 0.5%)
Quo = 0.853 cfs
n = 0.011 for smooth wall
s = 0.50%
Df,,,i = 7.50 inches
use 8 inches

QM;n =Minimum flow, (cfs)
VP = 127.6 ft3
QMin = 0.0059 Cfs
TP= 21600 seconds
TP = 6.00 hours
3. Volume in Top 24", Surface Volume , Vs = SA''n'2 (ft3)
SA =Surface area, (ft2)
n =Soil drainable porosity (range between 0.25 and 0.50)
SA = 255.2 ftZ
n = 0.45
VS = 229.7 ft3
4 Time to Drain Soil Zone , Ts = Vs /QMin, (hr)
Vs =Volume in top 24", (ft3)
QMin =Minimum flow, (cfs)
VS = 229.7 ft3
QMin = 0.0059 CfS
Ts= 38880 seconds
TS = 10.80 hours
5. Total Drawdown Time , Ttotai = TP + TS, (hr)
TP =Time to drain ponding zone, (hr)
TS = Time to drain soil zone (hr)
TP = 6.00 hours
TS = 10.80 hours
Ttotai = 16.80 hours
Sizing Overflow Weir
1. 10-year flow, Quo = C*i~o*A, (cfs)
C =Rational Coefficient (range between 0 and 1)
i~o = 10-year intensity, from IDF table, (in/hr)
A =Drainage area, (ft2)
C = 0.340
i~o = 7.21 in/hr
A = 15024 ft2
Quo = 0.853 cfs
total drainage area
2. Length of Weir, Lweir - Q10 / ICW*H1~51

DWQ Project No.
DIVISION OF WATER QUALITY - BIORETENTION AREA WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : PmC ~ ~y ~ri~D~,~~-\r
Contact Person: b S . 0.r ~ 1~. cPhone Number. (91°I 1 ~y tv - S`~0O
For projects vrith multiple basins, specify which basin this wor sheet applies to:
Permanent Pool Elevation TAD ft. (elevation of the orifice invert out)
Temporary Pool Elevation T$~ ft. (elevation of the outlet structure invert in)
BioretentionSurfaceArea ~5S sq. ft. R~o~,k„p ,, ~~,~e~-.~~,~
Drainage Area /,9 3 ~ ac. -
Impervious Area I ,q 3 L ac. (on-site and off-site drainage to the basin)
Rational C Coefficient 0 . ~ 3
Size % n 1't % (either 5% in w/sand under drain or 7% in wlo)
Inlet Velocity X817 fps
Inlet flow depth ~~ in
Depth to Ground Water i l~D ft.
Planting Soil Infiltration Rate X17 in./hr. (the soil layer down to 4 feet)
In-Situ Soil Infiltration Rate ~fl in.lhr. (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
~~ No vertical sand bed is proposed
/~ The bioretention area is at least 40 feet by 15 feet.
Sheet flow is provided at inlet.
Water table depth is greater than 6 feet.
Minimum of 6" ponding is provided.
The ponded area will draw down in less than 4 days.
~D Planting soil infiltration rate is greater than 0.52 in/hr.
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.
Planting soil meets minimum soil specifications (NCDENR stormwater Best Management
Practices Manual, April 1999)
Plan details for the bioretention area provided.
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
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Project Manager:
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Procopio Property
Imperial Custom Homes
Franklin County, NC
Source:
Franklinton Quadrangle

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11010 Raven Ridge Rd.• Raleigh, NC 27614
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VICINITY MAP
(U5~5 PRANKLINTON QUAD)
NOT TO SCALE
PRELIMINARY CONCEPT PLAN FOR:
PROCOPIO PROPERTY
RAIN GARDEN ~ BUFFER RESTORATION
FRANKLIN COUNTY, NC
ENVIRONMENTAL DESIGN FIRM:
SOIL ~ ENVIRONMENTAL
CONSULTANTS, PA
1010 Raven Ridge Road
Raleigh, NC 27614
(9 19) 846-5900
PREPARED FOR:
IMPERIAL CUSTOM 110ME5, INC.
65 Bethany Lane
Youngsville, NC 27596
(9 19) 872-2707
CONTENTS:
COVER, CONTENTS, ~ VICINITY MAP
2. OVERALL SITE PLAN
3. RAIN GARDEN LAYOUT ~ BUFFER RESTORATION
4. PLANTING SCHEDULE ~ PLANTING DETAILS
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2. RAIN GARDEN COMPONENTS INCLUDING FOOTPRINT,
LOCATION, DRAINS, ETC. ARE APPROXIMATE AND
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