20081515 Ver 1_401 Application_20081008

1 -?
September 30, 2008
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Page 1 of 2

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T O W E R
4
0 ENGINEERING
10
PROFESSIONALS O 8
Division 1 5 1 5
of Water Quality COURTESY
401 / Wetlands Unit Op Y
1650 Mail Service Center
Raleigh, NC 27699-1650
Subject: Pre-Construction Notification (PCN)
Nationwide Permit Number 39 Notification
Project Name: Dollar General - Saxapahaw Site
Cape Fear Watershed
Alamance County PIN 9708847780 Q T 1 2008
Alamance County, NC
Lat: N35.9062 Long: W79.3074 oE'wA??°u'wrr
yETuwoSariosTORwATER +
TEP # 081329.02-E
To Whom It May Concern:
Tower Engineering Professionals (TEP) has been contracted by Mr. Matt Lowder of Triangle Site Design,
PLLC to provide environmental services for the aforementioned proposed Dollar General Store in the
Community of Eli Whitney in southeastern Alamance County, NC. The property is owned by Dream Land
Homes, Incorporated. Mr. James D. Lamm, President of Dream Land Homes has signed and dated a
Statement of Authorization Form authorizing George T. Swearingen, III of Tower Engineering
Professionals to act as his agent (see enclosed letter). The proposed store location is located in the
southwest quadrant of the intersection of NC Hwy 87 & Greensboro-Chapel Hill Road, in Eli Whitney,
NC. The property in question is divided by an unnamed tributary of Mary's Creek flowing from south to
north through the central portion of the property.
The proposed construction activities do not involve any wetland impacts. However, 34.5 linear ft. (-182-
sq.ft.) of an unnamed intermittent tributary of the aforementioned unnamed tributary of Mary's Creek that
divides the property will be filled as a result of the proposed development. In addition, three utility lines
will be bored beneath the active channel of the unnamed tributary that divides the property. The proposed
utility lines will be bored at least 4-ft below the base of the active channel of the unnamed tributary and the
boring pits will be located outside the limits of any wetlands or streams located on the property. The
proposed utility lines will consist of a 1.25" electrical conduit, a 2" sanitary sewer line, and a 1" water
supply line.
Per a telephone conversation with Susan Homewood, this submittal is a "courtesy copy because written
approval for the 401 Certification is not required" thus no "application fee" has been included.
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
gswearingen(2tepgro up. net
2 ?
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T O W E R
ENGINEERING
PROFESSIONALS
September 30, 2008
Page 2 of 2
TEP personnel have conducted onsite meetings with Andrew Williams, USACOE-Raleigh Field Office.
Attached you will find the following documents required for the processing of this "courtesy copy".
• Completed PCN form
• Executed Agent Authorization Form from James D. Lamm, President Dream Homes, Inc.
• Site Vicinity Map
• A portion of the Saxpahaw, NC 7.5 Minute Topographic Quadrangle w/ parent property boundary
depicted
• A portion of the Alamance County Soil Survey pg. 32 w/ parent property boundary depicted
• Alamance County Tax Map
• Rain Garden Engineering Design Calculations
• Erosion Control Engineering Design Calculations
• Wetland Delineation map
• Rip-Rap Apron details
• Wetland & upland Data forms for Wetland location 1 & Wetland location 3
• Plan Sheets C-1, C-3, C-4, C-5, C-7, & C-8
Please don't hesitate to contact me with questions or concerns.
Sincer y,
Tower Engineering Professionals, Inc.
George T. Swearingen, III
Environmental Manager
3703 Junction Boulevard, Raleigh, NC 27603-5263 O) 919.661.6351 F) 919.661.6350
gswearin en _,tepgroup.net
Office Use Only: Form Version March 05
08-1515
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
C RJ c7•
1. Processing ro-py
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ? Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
? 401 Water Quality Certification ? Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide 39
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here:
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ?
II. Applicant Information Er?ULNWINN
1. Owner/Applicant Information 0 C T 1 2008
Name: James D. Lamm DENR - WA1 ER QUALITY
Mailing Address: 7354 Lindley Mill Road WETLANDS ANDSTORMWATERBRANGM
Graham North Carolina 27253
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: lammfarm(a?bellsouth.net
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: George T. Swearingen, III
Company Affiliation: Tower Engineering Professionals, Inc.
Mailing Address:3703 Junction Blvd
Raleigh, North Carolina 27603
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: gwwearingen cctepgroup.net
Updated 11/12005
Page 5 of 13
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Dollar General - Saxapahaw
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): Alamance County PIN-9708847780
4. Location
County: Alamance Nearest Town: Eli Whitney
Subdivision name (include phase/lot number): N/A
Directions to site (include road numbers/names, landmarks, etc.): From I-85 take Exit 147
South on NC Highway 87 qpproximately 13 miles until the intersection of NC Highway 87
and Greensboro-Chapel Hill Road in Eli Whitney, NC. The property is located in the
southwest quadrant of the aforementioned intersection.
5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that
separately lists the coordinates for each crossing of a distinct waterbody.)
Decimal Degrees (6 digits minimum): 35'54'22.66"N 79'18'27.17"W
6. Property size (acres): Proposed purchase of 2.21 Acres of the original Tract of 10.01 Acres
7. Name of nearest receiving body of water: Unnamed tributary of Mary's Creek
8. River Basin: Cape Fear
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site is currently undeveloped land with an unnamed
tributary of Mary's Creek flowing from south to north through the central portion of the
proposed purchase tract. The site is located in the southwest quadrant of the intersection of
NC Hwy 87 and Greensboro - Chapel Hill Road in the Community of Eli Whitney.
Updated 11/12005
Page 6 of 13
10. Describe the overall project in detail, including the type of equipment to be used: The site is
the proposed location of a Dollar General retail store. The project will involve the boring of
three utility lines (electrical, sanitary sewer, and potable water) at least four feet beneath the
channel base of the unnamed tributary of Mary's Creek that flows from south to north
through the central portion of the property. No impact to waters of the United States is
anticipated associated with aforementioned boring beneath the unnamed tributary of Maryy's
Creek. However, approximately 182-ft2 of impacts to an unnamed intermittent tributary of
the aforementioned unnamed tributary of Mary's Creek will be impacted as part of the
structural improvements associated with the proposed retail store. A pipe boring machine
will be used to bore and install the aforementioned electrical, water and sewer lines. In
addition, track hoes, back hoes, bulldozers, and multiple axle dump trucks will be used
during the development of the property in question.
11. Explain the purpose of the proposed work: The proposed work is required for the
construction of a proposed Dollar General Retail store and the associated improvements.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. Not applicable
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
No other permit requests are anticipated for this project
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
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
Updated 11/1/2005
Page 7 of 13
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: 182-ft2 of impacts to an unnamed
intermittent tributary of the unnamed tributary of Mary's Creek.
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
Site Number
(indicate on map)
Type of Impact Type of Wetland
(e.g., forested, marsh,
herbaceous, bog, etc.) Located within
100-year
Floodplain
(yes/no) Distance to
Nearest
Stream
(linear feet) Area of
Impact
(acres)
None

Total Wetland Impact (acres)
3. List the total acreage (estimated) of all existing wetlands on the property: 0.01437 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
Number
(indicate on map)
Stream Name
Type of Impact
Perennial Intermittent t? Average
Stream Width
Before Impact Impact
Length
(linear feet) Area of
Impact
(s q. ft.)
1 Unnamed tributary Fill Intermittent 5.275-ft 34.5 182

Total Stream Impact (by length and acreage) 34.5 182
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.
Updated 11/1/2005
Page 8 of 13
Open Water Impact
Site Number
(indicate on map) Name Waterbody

(if ap
applicable) )
Type of Impact Type of Waterbody
(lake, pond, estuary, sound, bay,
ocean, etc.) Area of
Impact
(acres)
None

Total Open Water Impact (acres)
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Impact (acres): 0.0042
Wetland Impact (acres): 0
Open Water Impact (acres): 0
Total Impact to Waters of the U.S. (acres) 0.0042
Total Stream Impact (linear feet): 34.5-ft
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:
VII. Impact Justification (Avoidance and Minimization)
Expected pond surface area:
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. The proposed undertaking has
minimized and avoided impacts to streams and wetlands within the nronertv in auestion to the
extent feasible. The unnamed tributary of Mary's Creek that dissects the property limits the
ability to alter the proposed undertaking.
Updated 11/1/2005
Page 9 of 13
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
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina (see DWQ website for most current
version.).
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
No compensatory mitigation is proposed as the proposed impacts are below the typical
thresholds limits established by the Wilmington District Corps of Engineers for
compensatory mitigation. The proposed project includes on site avoidance of 311 linear feet
of stream and 0.01437 acres of adjacent wetlands.
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
website at http://www.nceep.net/pages/inlieureplace.htm. If use of the NCEEP is proposed,
please check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet):
Updated 11/1/2005
Page 10 of 13
Amount of buffer mitigation requested (square feet):
Amount of Riparian wetland mitigation requested (acres):
Amount of Non-riparian wetland mitigation requested (acres):
Amount of Coastal wetland mitigation requested (acres):
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 V 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.
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 3 (2 for Catawba)
2 1.5
Total
* 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.
Updated 11/1/2005
Page 11 of 13
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.
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. See attached.
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
All onsite wastewater will be treated onsite via a septic tank and associated drain field (See
attached).
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application? Yes ? No
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
development, which could impact nearby downstream water quality? Yes ? No
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description:
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
Updated 11/1/2005
Page 12 of 13
/if-W Z2 o v Y 2-! ?M
Applicant/Agent's Signature ate
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Updated 11/1/2005
Page 13 of 13
US Army Corps of Engineers - Statement of Authorization
I hereby authorize George T. Swearingen, III of Tower Engineering Professionals, Inc. to act in my behalf
as my agent in the processing of this application for the US Army Corps of Engineers and NC Division of
Water Quality and to furnish, upon request, supplemental information in support of this permit
application.
Applicant's Name (Print) yIA MCS ,). LAm rr?
Applicant's Signa
r
Date 1 ?b.?y
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Soil Map-Alamance County, North Carolina
Dollar General
Map Unit Legend
Hiamance county, norm caronna trvLouuif
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
EbC3 Efland silty clay loam, 6 to 10 0.2 3.9%
percent slopes, severely
eroded (Badin)
GaB2 Georgeville silt loam, 2 to 6 2.4 43.5%
percent slopes, eroded
GbC3 Georgeville silty clay loam, 6 to 1.6 28.5%
10 percent slopes, severely
eroded (Tarrus)
Ld Local alluvial land, well drained 0.3 4.9%
We Worsham silt loam, 2 to 6 1.1 19.3%
percent slopes
Totals for Area of Interest (AOI) 5.5 100.0%
CSDA Natural Resources Web Soil Survey 2.0 9/24/2008
?? Conservation Service National Cooperative Soil Survey Page 3 of 3
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Page 1 of 1
Parcel ID 9708847780 Owner Name (Use % for DREAM LAND Property Address (Use % for S NC 87
(PIN): Wildcard): HOMES INC Wildcard): HWY
Old Tax ID: 8-12-88 Owner Address: 7354 LINDLEY Owner City: GRAHAM
MILL RD
Owner ST: NC Owner Zip: 27253 2nd Owner Name:
Deeded
Acres: 10.01 Lot #: LT 1 GIS Calc Acres: 10.01
Mkt Land
Value: 125994 Mkt Build Value: 0 Mkt Total Value: 125994
Build Sq Ft: 0 Year Built: 0 Sale Amnt: 154500
Date Sold: 20050603 Deed Book: 2253 Deed Page: 15
Plat Book: 069 Plat Page: 0453 Bedrooms: 0
Full Baths: 0 Basement: N Garage: N
RSINFO: 394747.255534
1:228 feet
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Rain Garden Design RG-1
Runoff Depth (in.) _ (P-0.2S)^2/(P+0.8S)
P= Precipitation (in.) = Drainage Area = 0.78 ac 33977 sf
S=1000/CN - 10
CN=Curve number Desired depression depth (in.) = 0
CN= 85
therefore, S= 1.76
Runoff depth = 0.17 in.
Runoff Volume = 5898 sf-in 492 cf
Required Surface Area (Vol/Depth) = 54.61492
Actual surface area of Rain Garden from drawings = 200 sf
Actual SAIDA 0.59%
IV. BIO-RETENTION DEPTH AND SOIL TYPE
Minimum depth of bio-retention area (optimum for cost and vegetation), (ft) ?J
Table 2 - Hydraulic Conductivity for Soil Types
found in Bio- Retention Areas Sitespecific Soil Type:
Soil Conductivity
in/hr
Sand 6
Loamy Sand 2
Sandy Loam 0.5 - 1
Soil Conductivity
in/hr
Alluvial 6
Use: 4 (conservative)
S Water
Fill Soil Layer- With Set Hydraulic
Conductivity (K). K expected to range 0 H
From 0.5 to 6 in/hr (1-2 in/hr TYP) AL
Rock -Laver w/ Drain Pines
Calculating Water Draw Through Rate
q=(2.3E-5)*K*A*H/L
Where;
Q = Flow (Rate of draw) through Bio-Retention Soil (cfs)
K = Hydraulic Conductivity of Soil (in/hr)
A = Surface Area of Bio-Retention Area (sf)
H = Height of water above gravel envelope/drainage pipe zone
L = Thickness of Soil (as determined above)
H - L, (or unless L is small, such as 2.0 feet), allow HIL =1
Find Drawdown Rate:
K (in/hr)= 4
A= 200
H =12.75
L=2
Q= 0.0184 cfs
Find time to drawdown water from inundation to saturation at surface:
V., = 150 cf
Time to remove Vis of water at flowrate, Q Time to drawdown 1" storm V= 492
Ts., = Vj-dQ
T.4 = 8152 seconds T.-I = 26714 sec
T.4 = 2 hours T.-I = 7.42 hr
Time to drawdown water from saturation at surface to X feet below surface: X = 0
Porosity, n = 0.45
Calculate volume of water to drawdown in soil:
V12=X(ft)*SA*n
V,-2 = 180 cf
Time to remove water from VAX:
Tr?2 = Vs-x/Q
T,-2 = 9783 seconds
T,-2 = 3 hours
Total time to draw water through soil:
Time = Ts, + T12
Time = 5 hours
Sizing Underdrain Pipes and Gravel Envelope
Q = 0.0184 cfs
Size drains so they are able to carry 10X the soil drawdown
Q = 0.184 cfs
Manning Roughness Coefficients:
Pi Type and Diameter Manning Roughness Coefficient
4" Single Wall Corrugated Plastic 0.0145
4" Smooth Wall Plastic 0.0105
6" Single Wall Corrugated Plastic 0.0145
6" Smooth Wall Plastic 0.0105
8" Single Wall Corrugated Plastic 0.0155
N * D = 16 * (Q*nls"0.5)".375
n = 0.0105
s =10.005
N * D = 4.1 inches
D= 6
N= 1
Therefore, one 6" pipe is required.
The gravel envelope surrounding the drainage pipe should be 6" deep at a minimum.
Sizing the Bio-Retention Outlet:
Find the peak flow:
QP = C*I*A
C = 0.75
1= 7.1
A = 0.78
Qp = 4.2 cfs
Find Total Wier Length:
L = Q/(C,H * H") CW = 3
H = 0.5 (feet above wier water can rise)
L = 3.92 feet
wier height is to be set 9" above the bottom of the depression.
Raib Garden Design RG-2
Runoff Depth (in.) _ (P-0.2S)^2/(P+0.8S)
P= Precipitation (in.) = Drainage Area = 0.2 ac 8712 sf
S=1000/CN - 10
CN=Curve number Desired depression depth (in.) = 0
CN= 85
therefore, S= 1.76
Runoff depth = 0.17 in.
Runoff Volume = 1512 sf-in 126 cf
Required Surface Area (Vol/Depth) = 14.00383
Actual surface area of Rain Garden from drawings = 152 sf
Actual SAIDA 1.74%
IV. BIO-RETENTION DEPTH AND SOIL TYPE
Minimum depth of bio-retention area (optimum for cost and vegetation), (ft) 0
Table 2 - Hydraulic Conductivity for Soil Types
found in Bio- Retention Areas Site s ?eCiflc Soil Tv-:
Soil Conductivity
in/hr
Sand 6
Loamy Sand 2
Sandy Loam 0.5 - 1
Soil Conductivity
in/hr
W B 6
Use: 4 1(conservative)
0 Water
Fill Soil Layer- With Set Hydraulic
Conductivity (K). K expected to range
from 0.5 to 6 in/hr (1-2 in/hr TYP)
Rock -Layer w/ Drain Pi
Calculating Water Draw Through Rate
q=(2.3E-5)'K'A'H/L
Where;
Q = Flow (Rate of draw) through Bio-Retention Soil (cfs)
K = Hydraulic Conductivity of Soil (in/hr)
A = Surface Area of Bio-Retention Area (sf)
H = Height of water above gravel envelope/drainage pipe zone
L = Thickness of Soil (as determined above)
H
?L
H - L, (or unless L is small, such as 2.0 feet), allow H/L = 1
Find Drawdown Rate:
K (in/hr)= 4
A = 152
H =12.75
L=2
Q= 0.013984 cfs
Find time to drawdown water from inundation to saturation at surface:
Vs, = 114cf
Time to remove VI-5 of water at flowrate, Q Time to drawdown 1" storm V= 126
T., = Vi_dQ
TB_I = 8152 seconds T.-I = 9013 sec
T6., = 2 hours T.-I = 2.50 hr
Time to drawdown water from saturation at surface to X feet below surface: X = 0
Porosity, n = 0.45
Calculate volume of water to drawdown in soil:
Vs2 = X (ft)' SA' n
V8.2 = 136.8 cf
Time to remove water from VAX:
Ts2 = V.X/Q
T,-2 = 9783 seconds
Te.2 = 3 hours
Total time to draw water through soil:
Time = T?j + T12
Time = 5 hours
Sizina Underdrain Pipes and Gravel Envelo
Q = 0.013984 cfs
Size drains so they are able to carry 1 OX the soil drawdown
Q = 0.13984 cfs
Manning Roughness Coefficients:
Pi Type and Diameter Manning Roughness Coefficient
4" Single Wall Corrugated Plastic 0.0145
4" Smooth Wail Plastic 0.0105
6" Single Wall Corrugated Plastic 0.0145
6" Smooth Wall Plastic 0.0105
8" Single Wall Corrugated Plastic 0.0155
N * D = 16 * (Q*nls"0.5)".375
n = 0.0105
s =10.005
N * D = 3.7 inches
D= 4
N= 1
Therefore, one 4" pipe is required.
The gravel envelope surrounding the drainage pipe should be 6" deep at a minimum.
Sizing the Bio-Retention Outlet:
Find the peak flow:
QP = C*I*A
C = 0.75
1= 7.1 (from IDF Charts for location, 25-yr, 24 hr)
A = 0.2
Qp = 1.1 cfs
Find Total Wier Length:
L = QI(CW * H'-) C. = 3
H = 0.75 (feet above wier water can rise)
L = 0.55 feet
Wier height is to be set 9" above the bottom of the depression.
EROSION CONTROL CALCS (RIP-RAP CALCULATIONS)
Project Information
Project Name: Dollar General - Saxapahaw
Project #: 004003
Designed by: Date:
Revised by: Date:
Checked by: Date:
Pipe Outfall
Driveway Pipe Outfall
Pipe Diameter d= 30
Pipe Slope s= 0.73 %
Manning's number n= 0.013
Flow Q= 20.2 cfs
Velocity V = 5.80 ft/s
Dissipator Dimensions ' Zone = 2
Stone Filling Class = B
Entry Width ( 3 X Do ) = 7.5 ft
Length (6X Do) = 15.0 ft
Width (La + Do) = 17.5 ft
Min. Thickness = 22 inches
Min. Stone Diameter= 6 inches
7.
AN units are in feet
" Dssipator pad designed for full flow of pipe
Pipe Diameter d= 18 in
Pipe Slope s= 1 %
Manning's number n= 0.013
Flow Q= 10.5 cfs
Velocity V = 6.70 ft/s
Dissipator Dimensions ` Zone = 2
Stone Filling Class = B
Entry Width ( 3 X Do ) = 4.5 ft
Length (6X Do) = 9.0 ft
Width (La + Do) = 10.5 ft
Min. Thickness = 22 inches
Min. Stone Diameter- 6 inches
4.
2007 NCDENR EC Spreadsheet - compiete 9/19/2006 Page 1 of 2
AN units are in feet
Dssipator pad designed for full flow of pipe
PARKING LOT OUTFALL
Pipe Diameter d= 15 in
Pipe Slope s= 0.5 %
Manning'snumber n= 0013
Flow Q= 2 cfs
Velocity V = 150 ft/s
Dissipator Dimensions " Zone = 1
Stone Filling Class = B
Entry Width ( 3 X Ap) = 3.8 ft
Length (6XAa)= 7.5 ft
Width (La + AD) = 8.8 ft
Min. Thickness= 22 inches
Min. Stone Diameter- 6 inches
3.
2007 NCDENR EC Spreadsheet - complete 9/19/2008 Page 2 of 2
All units are in feet
Dssipator pad designed for full flow of pipe
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DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
Project/Site: Dollar General-SE
Applicant/Owner: James D. Lamm
Investigator: George T. Sweari
haw Store # 11418 Date:
County
III State:
8-21-08
Alamance
NC
Do Normal Circumstances exist on the site? es No Community ID: Wetland Data Point 1
Is the site significantly disturbed (Atypical Situation)? Yes No Transect ID:
Is there area a potential Problem Area? Yes No Plot ID: Wetland 1
if needed, explain on reverse.
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Acer rubrum tree FAC 9.
2. Liquidambar styraciflua tree FAC+ 10.
3. Polygonum pensylvanicum herb FACW 11.
4. Rosa multifbra shrub UPL 12.
5. 13.
6. 14.
7. 15.
8. 16.
Percent of Dominant Species that are OBL, FACW or
FAC (excluding FAC-).
75%
Remarks:
HYDROLOGY
X Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
X Aerial Photographs
X Other - Soils map
No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 Inches
X Water Marks
Drift Lines
Sediment Deposits
Field Observations: X Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water (in.) Oxidized Root Channels in Upper 12 Inches
X Water-Stained Leaves
Depth to ee Water in Pit: Local Soil Survey Data
(in.)
FAC-Neutral Test
Depth to Saturated Soil: (in.) Other (Explain in Remarks)
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
SOILS
Map Unit Name
(Series and Phase): Worsham silt loam (variant) Drainage Class:
Poorly Drained
Taxonomy -
Field Observations
(Subgroup): thermic Typic Endoaquults Confirm Mapped Type? Yes No
Profile Descri ption:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
inches Horizon Munsell Mast Munsell Mast Abundance/Contrast Structures, etc.
0-14 A 10YR 4/4 7.5YR5/8 5-10% Silt loam
14-18 B1 2.5Y 5/2 7.5YR5/8 15% Silt loam
18-24+ B2 2.5Y6/1 7.5YR5/8 5-10% Silty clay loam
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
X Reducing Conditions Listed on National Hydric Soils List
X Glayed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
WETLAND DETERMINATION
Hydrophytic Vegetation Present
Wetland Hydrology Present?
Hydric Soils Present?
No (Circle)
No
No Is this Sampling Point Within a Wetland?
No
(Circle)
G;)
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
Project/Site: Dollar General-Saxa ahaw Store # 11418 Date: 8-21-08
Applicant/Owner: James D. Lamm County: Alamance
Investigator: George T. Swearingen, III State: NC
Do Normal Circumstances exist on the site? Yes No Community ID: Upland Data Point 1
Is the site significantly disturbed (Atypical Situation)? Yes No Transect ID:
Is there area a potential Problem Area? Yes No Plot ID: Upland 1
if needed, explain on reverse.
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Liquidambar styraciflua tree FAC+ 9.
2. Acer rubrum tree FAC 10.
3. Rubus alle heniensis shrub UPL 11.
4. 12.
5. 13.
6. 14.
7. 15.
8. 16.
Percent of Dominant Species that are OBL, FACW or
FAC (excluding FAC-).
66%
Remarks:
HYDROLOGY
X Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
X Aerial Photographs
X Other - Soils map
_ No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 Inches
Water Marks
Drift Lines
Sediment Deposits
Field Observations: Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water (in.) Oxidized Root Channels in Upper 12 Inches
Water-Stained Leaves
Depth to Free Water in Pit: (in.) Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) Other (Explain in Remarks)
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
SOILS
Map Unit Name
(Series and Phase): Worsham silt loam (variant) Drainage Class: -Poorly Drained
Taxonomy Field Observations
(Subgroup): thermic Typic Endoaquults Confirm Mapped Type? GD Yes
Profile Descri ption:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
inches Horizon Munsell Mast Munsell Mast Abundance/Contrast Structures, etc.
0-18 A 10YR 4/6 7.5YR 5/8 5-10% Loam
18+ B 2Y 5/2 7.5YR 5/8 15% Loam
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Glayed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
WETLAND DETERMINATION
Hydrophytic Vegetation Present es (Circle) (Circle)
Wetland Hydrology Present? es
Hvdric Soils Present? Yes No Is this SamDlina Point Within a Wetland? Yes N
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
Project/Site: Dollar General-Saxa ahaw Store # 11418 Date: 8-21-08
Applicant/Owner: James D. Lamm County: Alamance
Investigator: George T. Swearingen, III State: NC
Do Normal Circumstances exist on the site? es No Community ID: Wetland Data Point 3
Is the site significantly disturbed (Atypical Situation)? Yes No Transect ID:
Is there area a potential Problem Area? Yes No Plot ID: Wetland 3
if needed, explain on reverse.) I
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1 . Polygonum pensylvanicum herb FACW 9.
2. Commelina communis herb FAC 10.
3. Sambucus canadensis shrub FACW- 11.
4. Liquldambar styracidua tree FAC+ 12.
5. Solidago sp herb - 13.
6. Urtica dloca herb FAC+ 14.
7. Mikania scandens vine FACW+ 15.
8. 16.
Percent of Dominant Species that are OBL, FACW or
FAC (excluding FAC-).
85%
Remarks:
HYDROLOGY
X Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
X Aerial Photographs
X Other - Soils map
_ No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
X _ Saturated in Upper 12 Inches
Water Marks
Drift Lines
Sediment Deposits
Field Observations: X Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water (in.) Oxidized Root Channels in Upper 12 Inches
Water-Stained Leaves
Depth to Free Water in Pit: Local Soil Survey Data
4 (in.)
FAC-Neutral Test
Depth to Saturated Soil: 1 (in.) Other (Explain in Remarks)
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
SOILS
Map Unit Name
(Series and Phase): Worsham silt loam (variant) Drainage Class: -Poorly Drained
Taxonomy Field Observations
(Subgroup): thermic Typic Endoaquults Confirm Mapped Type? Yes No
Profile Description:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
inches Horizon Munsell Mast Munsell Moist Abundance/Contrast Structures, etc.
0-11 A 2.5YR 4/2 absent absent Coarse sand
11-18+ 61 7.5YR 4/2 absent absent Sandy clay loam
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
X Reducing Conditions Listed on National Hydric Soils List
X Glayed or Low-Chroma Colors Other (Explain in Remarks)
Remarks: Hillside /streamside seep coarse sand overlaying heavy Sandy clay loam adjacent to perennial stream.
WETLAND DETERMINATION
Hydrophytic Vegetation Present No (Circle) (Circle)
Wetland Hydrology Present? No
Hydric Soils Present? Ye No Is this Sampling Point Within a Wetland? Ye
No
Remarks:
DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
1. Solidago altissma herb FACU+ 9.
2. Junlperous vkginiana tree FACU- 10.
3. Eupatorium frstulosum herb FAC+ 11.
4. Liquidambar styraciflua tree FAC+ 12.
5. Li ustrum si . nense shrub FAC 13.
6. Liqiudambar styraciflua tree FAC+ 14.
7. 15.
8• 16.
Percent of Dominant Species that are OBL, FACW or
FAC (excluding FAC-).
66%
Remarks:
HYDROLOGY
X Recorded Data (Describe in Remarks):
Stream, Lake or Tide Gauge
X Aerial Photographs
X Other - Soils map
No Recorded Data Available Wetland Hydrology Indicators:
Primary Indicators:
Inundated
Saturated in Upper 12 Inches
Water Marks
Drift Lines
Sediment Deposits
Field Observations: Drainage Patterns in Wetlands
Secondary Indicators (2 or more required):
Depth of Surface Water (in.) Oxidized Root Channels in Upper 12 Inches
Water-Stained Leaves
Depth to Free Water in Pit: (in.) Local Soil Survey Data
FAC-Neutral Test
Depth to Saturated Soil: (in.) Other (Explain in Remarks)
Remarks:

DATA FORM
ROUTINE WETLAND DETERMINATION
(1987 COE WETLANDS DELINEATION MANUAL)
SOILS
Map Unit Name
(Series and Phase): Worsham silt loam (variant) Drainage Class: -Poorly Drained
Taxonomy Field Observations
(Subgroup): thermic Typic Endoaquults Confirm Mapped Type? No Yes
Profile Descri ption:
Depth Matrix Color Mottle Colors Mottle Texture, Concretions,
inches Horizon Munsell Mast Munsell Moist Abundance/Contrast Structures, etc.
0-12 A 7.5YR 4/6 absent absent Clay loam
12-18+ B1 7.5YR 4/6 10YR 3/1 2% Clay loam
18-24 B2 7.5YR 4/6 10YR 7/4 45% Loam
Hydric Soil Indicators:
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer in Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Glayed or Low-Chroma Colors Other (Explain in Remarks)
Remarks:
WETLAND DETERMINATION
Hydrophytic Vegetation Present Yes (Circle) (Cir?NNJ
Wetland Hydrology Present? es
H dric Soils Present? Yes No Is this Sampling Point Within a Wetland? Yes Remarks:

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