20051096 Ver 1_Complete File_20050607

O?O?WAT ?qQG
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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
Augusttf, 2005
DWQ Project # 05-1406
Durham County
DB Builders, Inc.
Attn: Larry Thomas
9 Preakness Court
Durham, NC 27713
Subject Property:
Carpenter Pointe Phase 3
Durham, NC
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River
Buffer Protection Rules (15A NCAC 2B .0233) with Additional Conditions
Dear Mr. Thomas:
You have our approval, in accordance with the attached conditions and those listed below, to place fill
within or otherwise impact 0.047 acres of wetlands, 75 feet of streams and 7880 square feet (ft) of
protected riparian buffers for the purpose of constructing single family residential subdivision on the
subject property, as described within your application dated June 17, 2005, and received by the N.C.
Division of Water Quality (DWQ) on June 20, 2005. After reviewing your application, we have decided
that the impacts are covered by General Water Quality Certification Number(s) 3402 (GC3402). The
Certification(s) allows you to use Nationwide Permit(s) NW39 when issued by the US Army Corps of
Engineers (USACE). This letter shall also act as your approved Authorization Certificate for impacts to
the protected riparian buffers per 15A NCAC 2B .0233. In addition, you should obtain or otherwise
comply with any other required federal, state or local permits before you go ahead with your project
including (but not limited to) Erosion and Sediment Control, Non-discharge, and other regulations. Also,
this approval to proceed with your proposed impacts or to conduct impacts to waters as depicted in
your application shall expire upon expiration of the 404 or CAMA Permit.
This approval is for the purpose and design that you described in your application. If you change your
project, you must notify us and you may be required to send us a new application. If the property is sold,
the new owner must be given a copy of this Certification and approval letter and is thereby responsible for
complying with all conditions. If total fills for this project (now or in the future) exceed one acre of
wetland or 150 linear feet of stream, compensatory mitigation may be required as described in 15A
NCAC 21-1.0506 (h). This approval requires you to follow the conditions listed in the attached
certification and any additional conditions listed below.
The Additional Conditions of the Certification are:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific and general
conditions of this Certification (or Isolated Wetland Permit) are met. No other impacts are
approved including incidental impacts:
Noy` Carolina
401 Oversight/Express Permitting Unit
f!(Call?
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: http://h2o.enr.state.nc.us/ncwetlands
An Equal Opportunity/Affirmative Action Employer -50?7o Rccycled/10?7o Post Consumer Paper
DB Builders, Inc.
Page 2 of 3
August 1, 2005
Amount Approved (Units) Plan Location or Reference
Stream 75 (feet) PCN
404/CAMA Wetlands 0.047 (acres) PCN
Buffers 7880 (square ft.) PCN
2. Erosion & Sediment Control Practices
Erosion and sediment control practices must be in full compliance with all specifications
governing the proper design, installation and operation and maintenance of such Best
Management Practices in order to protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed,
operated, and maintained in accordance with the most recent version of the North Carolina
Sediment and Erosion Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control
measures must be such that they equal, or exceed, the requirements specified in the most
recent version of the North Carolina Sediment and Erosion Control Manual. The devices
shall be maintained on all construction sites, borrow sites, and waste pile (spoil) projects,
including contractor-owned or leased borrow pits associated with the project.
c. For borrow pit sites, the erosion and sediment control measures must be designed, installed,
operated, and maintained in accordance with the most recent version of the North Carolina
Surface Mining Manual.
d. The reclamation measures and implementation must comply with the reclamation in
accordance with the requirements of the Sedimentation Pollution Control Act.
3. No Waste, Spoil, Solids, or Fill of Any Kind
No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond
the footprint of the impacts depicted in the Pre-Construction Notification. All construction
activities, including the design, installation, operation, and maintenance of sediment and erosion
control Best Management Practices, shall be performed so that no violations of state water quality
standards, statutes, or rules occur.
4. No Sediment & Erosion Control Measures w/n Wetlands or Waters
Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum
extent practicable. If placement of sediment and erosion control devices in wetlands and waters
is unavoidable, they shall be removed and the natural grade restored within six months of the date
that the Division of Land Resources has released the project.
5. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer Rules, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401 Oversight/Express Review Permitting Unit, North Carolina
Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650.
6. Written Stormwater Management Plan (Final Plan Needed)
A final, written stormwater management plan (including a signed and notarized Operation and
Maintenance Agreement) shall be submitted to the 401 Oversight and Express Permitting Unit
DB Builders, Inc.
Page 3 of 3
August 1, 2005
(2321 Crabtree Blvd., Suite 250, Raleigh, NC, 27604) within 60 days of the issuance of the 401
Water Quality Certification. The stormwater management plans shall be approved in writing by
this Office before the impacts specified in this Certification occur per Condition No. 4 in GC No.
3402. You have the option of using the Express Review Program for expedited approval of these
plans. If you propose to use the Express Review Program, remember to include the appropriate
fee with the plan. The stormwater management plan must include plans, specifications, and
worksheets for stormwater management facilities that are appropriate for the surface water
classification and designed to remove at least 85% TSS according to the most recent version of
the NC DENR Stormwater Best Management Practices Manual. These facilities must be
designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality. Also, before any permanent building is occupied at the subject site,
the facilities (as approved by this Office) shall be constructed and operational, and the stormwater
management plan (as approved by this Office) shall be implemented. The structural stormwater
practices as approved by this Office as well as drainage patterns must be maintained in perpetuity.
No changes to the structural stormwater practices shall be made without written authorization
from the Division of Water Quality.
Violations of any condition herein set forth may result in revocation of this Certification and may result in
criminal and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct
impacts to waters as depicted in your application and as authorized by this Certification, shall expire upon
expiration of the 404 or CAMA Permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or
stream impacts), you may ask for an adjudicatory hearing. You must act within 60 days of the date that
you receive this letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of
the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center,
Raleigh, N.C. 27699-6714. This certification and its conditions are final and binding unless you ask for a
hearing.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts) shall be referred in writing to the Director for a decision. The Director's decision is
subject to review as provided in Articles 3 and 4 of G.S. 150B.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water
Act and the Neuse River Basin riparian buffer protection rule as described within 15A NCAC 2B .0233.
If you have any questions, please telephone Cyndi Karoly at 919-733-99721 or Deborah Edwards at 919-
733-9502.
Sincerely,
AWKlijm
r.Kl P.E.
DB Builders, Inc.
Page 4 of 3
August 1, 2005
Enclosures: GC 3402
Certificate of Completion
cc: Mr. Todd Preuninger, Soil & Environmental Consultants, PA, 11010 Raven Ridge Road, Raleigh, NC 27614
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
051096CarpenterftinteM (Durham)401+buffers
?O
Soil & Environmental Consultants, PA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
June 20, 2005
S&EC Project # 7559.w1
To: US Army Corps of Engineers N.C. Division of Water Quality
Raleigh Regulatory Field Office 401 Oversight and Express Permits Unit
Attn: Todd Tugwell Attn: Cyndi Karoly
6508 Falls of the Neuse Rd. 2321 Crabtree Boulevard, Suite 250
Suite 120 Raleigh, NC 27604-2260
Raleigh, NC 27615
From: Todd P o gee p@L-NW12
Soil & Environmental Consultants, P.A. P
110
10 Raven Ridge Road Raleigh, NC 27614
JUN 2 v 2005
Re: Carpenter Pointe Phase 3
Durham, NC 1'i'ETW0 AND STfORt,,"ra TER Emu
On behalf of the owner, D.B. Thomas Builders Inc., please find attached a complete application
and supplemental information requesting written concurrence from the U.S. Army Corps of
Engineers (USACE) and the N.C. Division of Water Quality (DWQ) that the activities proposed
below may proceed under Nationwide Permit 39 and General Water Quality Certification 3402.
Please contact me at [phone] if you have any questions or require additional information.
In addition, please consider this application our request for a no practical alternatives
determination and Authorization Certificate for impacts to riparian buffers protected under the
Neuse Buffer Rule.
PROJECT SUMMARY
Project Name Carpenter Pointe Phase 3
Project Type Residential Subdivision
Owner / Applicant D.B. Thomas Builders Inc.
Count Durham
Nearest Town Durham
Water Body Name UT to Panther Creek
Basin / Sub-basin Neuse 03-04-01
Index Number 27-6-(1)
Class WS-IV, NSW
IMPACT SUMMARY
Stream Impact (acres): 0.02 ac
Wetland Impact acres : 0.047 ac
Open Water Impact (acres): 0.0 ac
Total Impact to Waters of the U.S. (acres) 0.049 ac
Total Stream Impact (linear feet): 75'
Total Impact to Buffers 7,880 sf
Attachments:
• Pre-construction Notification (PCN)
Application Form
• Agent Authorization
• NE Durham, NC - USGS Map
• Durham Soil Survey Map Sheet No. 18 & 21
• Impact Maps
• NCDWQ Buffer Letter
• Level Spreader Worksheets, Operation &
Maintenance Agreement and Details
• $200 Application Fee to DWQ
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]
Fay. (1161 S1fl.RT2S
Office Use Only: Fonn Vcrsion March 05
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
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 Pen-nit Number(s) Requested: 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 coasta ounties (listed on page
4), and the project is within a North Carolina Division of Coas 11 I f
Environmental Concern (see the top of page 2 for further details), c k ere:
M1
2 u
II. Applicant Information JUN 2005
DENR _ WATER
Owner/Applicant Information I? DSANDSTORIAVATERBjW,CH
Name: DB Thomas Builders, Inc.
Mailing Address: Attn: Larry Thomas
9 Preakness Ct.
Durham, NC 27713
Telephone Number: 919-401-7643 Fax Number: 919-493-0147
E-mail Address: NA
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: Todd Preuninjer
Company Affiliation: Soil & Environmental Consultants, PA.
Mailing Address:_ 11010 Raven Ridge Rd.
Raleigh, NC 27614
Telephone Number: 919-846-5900 Fax Number: 919-846-9467
E-mail Address: TPreuningernsandec.com
Page 1 of 8
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: Carpenter Pointe Phase 3
2. T.I.P. Project Number or State Project Number (NCDOT Only): NA, not a DOT project
3. Property Identification Number (Tax PIN): 0852-01-28-6830
4. Location
County: Durham Nearest Town: Durham
Subdivision name (include phase/lot number): Carpenter Pointe-Phase 3
Directions to site (include road numbers/names, landmarks, etc.):From Raleigh take Hwy
70 northwest to Durham enter on to Interstate 85 North. Take exit # 180 turn ri Pit onto SR
1675. Turn left onto Farrell Rd (SR 1671. Turn right onto Carpenter Rd. (SR 1822). The
site is located on the north side of Carpenter Rd. approximately 0.5 miles from the
intersection of Carpenter Rd. and Farrell Rd.
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): 036.0286833 ON 078.8231527 °W
6. Property size (acres): 34.552 ac
7. Name of nearest receiving body of water: Panther Creek
8. River Basin: Neuse
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://12o.enr.state.nc.us/admin/maps/.)
Page 2 of 8
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. The majority of the
surrounding land is undeveloped / forested or residential property.
10. Describe the overall project in detail, including the type of equipment to be used: The
proposed project is the construction of a single family residential subdivision.
11. Explain the purpose of the proposed work: The basic project purpose is to construct a
single-family residential subdivision on the subject property.
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. Although this project is considered Phase 3 of an existing subdivision
the property owner is different than Phases I and 2. We are unaware of any pennitting or
impacts sustained from the construction of Phases 1 and 2 No previous permits have been
applied for or issued for this property (Phase 3). On August 24, 1999 Mr. Steve Mitchell of the
NC-DWQ made buffer determinations, (see attached letter NBRRO 99-215)
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 future permits are anticipated at this time.
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
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.
Page 3 of 8
I . Provide a written description of the proposed impacts: The proposed impacts consist
of the following. Impact 1 is a proposed sewer connection which would impact 1,609 square
feet of Neuse Buffers. Impact 2 is a proposed shared driveway which would impact 6,091
square feet of Neuse Buffers, 75 linear feet of stream channel and 193 square feet (0.094-ac)
of jurisdictional wetlands. Impact 3 is a proposed residential lot which would impact 1,880
square feet (0.043 ac) of jurisdictional wetlands.
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,
se aratel 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
2 Temporary, Forested / riparian no 0 0.004
excavation
3 Fill Emergent / headwater No 700 0.043
Total Wetland Impact (acres) 0.047
3. List the total acreage (estimated) of all existing wetlands on the property: 0.25 acre
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 Average Impact Area of
Number Stream Name Type of Impact Perennial Stream Width Length Impact
indicate on map) Intermittent?
Intermittent? Before Impact linear feet acres
2 UT to Panther Culvert Intermittent 2? 75' 0.02
Creek
Total Stream Impact (by length and acreage) 75' 0.02
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
Wate Type of Waterbody Area of
Site Number e)
(if applicable) Type of Impact (lake, pond, estuary, sound bay, Impact
indicate on ma ocean, etc. acres
NA NA NA NA NA
Total Open Water Impact (acres) 0.0
6. List the cumulative impact to all Waters of the U.S. resulting from the project.
Stream Impact acres): 0.02 ac
Wetland Impact (acres): 0.047 ac
Open Water Impact (acres): 0.0 ac
Page 4 of 8
Total Impact to Waters of the U.S. (acres) 0.049 ac
Total Stream Impact (linear feet): 75'
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.): NA
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): NA
Current land use in the vicinity of the pond: NA
Size of watershed draining to pond: NA Expected pond surface area: NA
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. Impact 1 is necessary two tie
into theexistinp sewer network therebv nrovidina utilitv to the nronosed subdivision. lmnact 2
is necessary to access an isolated area of upland for lot usage. Finally impact 3 is required to
construct a residential lot.
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
Page 5 of 8
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, available at
http://12o.enr.state.nc.us/ncwetIands/strmgido.htm1.
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.
Because the impacts to wetlands are less than 0.10 acre, impacts to streams occur on
intermittent streams, and because the proposed impacts have been minimized and avoided to
the maximum extent practicable we believe that no mitigation should be required.
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://h2o.enr.state.nc.us/wrp/index.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): 0.0
Amount of buffer mitigation requested (square feet): 0.0
Amount of Riparian wetland mitigation requested (acres): 0.0
Amount of Non-riparian wetland mitigation requested (acres): 0.0
Amount of Coastal wetland mitigation requested (acres): 0.0
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 ?
Page 6 of 8
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
(Neuse), 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 )? 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.
I Impact I Required
Zone* ,,,.. _„ I
Multiplier X4:.:__.:_
1 3,978 3 (2 for Catawba) NA
2 3,902 1.5 NA
Total 7,880 NA
* 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 I.
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. NA, no buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stonnwater
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 impervious will not exceed 24% as per Water Supply IV Watershed
regulations. The proposed impervious acreage on the site will be 8.3 acres. The total acreage on
Page 7 of 8
the site is 34.6 acres. The percent proposed impervious will equal 24% or less. Site area data is
provided on DWQ No. 1, 1 of 8 attached.
XIL 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.
The project will tie into Durham's existing sanitary sewer network.
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 pen-nit 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://h 2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description: We
have reviewed the "DRAFT Internal Policy, Cumulative impacts and the 401 Water Quality
Certification and Isolated Wetland Programs" document prepared by the NC Division of Water
Quality on October 3, 2002, version 1.6. The draft states that most residential subdivisions are
unlikely to cause cumulative impacts. Of the three criteria of private projects that can clearly
result in cumulative impact Carpenter Pointe Phase 3 only meets one. The project is not
relatively large for a residential development in northeast Chatham County, the project will
involve no commercial development, however the project will occur in an otherwise relatively
undeveloped landscape. Some of the current regulations protecting water quality associated with
this project include the 401, 404, and WS-IV, NSW water supply rules. We anticipate that you
will advise us if a qualitative or quantitative impact analysis is required.
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 pen-nits. 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).
NA
Applieant/Agent s Signature Datc
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 8 of 8
JUTA-13-2005 10:59 From:RL HORVATH
06/02/2005 11:10 FAX
l?
U002/002
Soil & Environmental Consultants PA
11010 haven Ridge Road - .Raleigh. North Carolina 27614 • Phone [phone]
- ( F+uc, [phone]
www.S?ndEC_com
AGENT AUTHOMAnON FORM
All Blanks To he 17illed 1n By The Current Landowner
Nance: j.__& MAS :euIL05,2S WG .
• Address:
Phone: 10,,
Ai
Project Name/ Description: CA??i ?nl 1 ??
Date: JIdIJri lD jl? The Department of the Army
U.S. Army Corps of Engineers, Wilmington District
P.O. Box 1890
Wilmington, NC 28402
Attn:
Field Office: 1-1
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
1, the current P1.2P_e_rtX owner, h° 2reby designate and authorize Soil & Environmental Consultants, PA to
act in my behalf as my agent in -:he processing of pexmtit applications, to furctish upon request
supple.tttental inforrnation in su:nport of applications, etc, from this day forward- Tlie '-? day of
IlAt.l'
This notification supersedes any previous correspondence concerning the agent for this project
NOTICE: This authorl=don, for liability and professional courtesy reasons, is valid only for
government officials to enter the property when accompanied by P&1vC staff. You should call S&EC
to arrange a site meeting prior to visiting the site.
Lag ?
Plitt Property Owner's Name
property ex's Signatur
cc. Ms. Cyndi Karoly cc: Mr. Todd Preuninger
NCOENR - DWQ Soil & Cnvironmexttal Consultants, PA
2321 Crabtree Boulevard
ru3 -
S.hA[?ollC ?)YLC
236 L4;Pb1l1ip Chart, Suite C rM=12o?:
Concord, NC 28025 3817-E Lawaduln 17livc
. NC
Phone: [phone] Mow-b 33 3 27455
F.?ix: [phone] Phone: (336) oo-HZ34
Fux: [phone]
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ect No.
P Figure 1 - USGS Map
559
Project Mgr.: Carpenter Pointe Phase 3
TP D.B. Thomas Builders Inc.

Durham County, NC
Scale:
1" = 2,000'
06/18105 NE Durham Quadrangle
RRI?\
0

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11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] - [phone]
Web Page: www.SandEC.cam
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Project No. j Figure 2 - Soil Survey Map
7559.W1 , PA
Soil & Environmental Consult?.nis
Project Mgr.: Carpenter Pointe Phase 3
11010 Raven Ridge Rd.• Raleigh, NC 27614
TP D.B. Thomas Builders, Inc. [phone] • [phone]
- - - Durham County, NC Web Page: u,ww.SandEC.com
Scale:
V = 1,320'
06/18/05 Durham County Soil Survey
SI'Z'E SUMMARY
D-r-kFL OP??
D 9. THOMAS 6UILOERS, /NC.
406 iYYNFORD CT.
DURHAM, NC 27707
PHONE [phone]
SITE AREA DATA:
PARCEL !D: 170921
PIN: 0852--01-28-68,30
AREA PROPOSED
SITE ZONING' IMPERVIOUS
AC SF SF `7
PHASE III PDR 1.98 34.552 1,505,085 361,220 24.00
NOTES:
ZONING: PDR 1.98
PROPOSED USE: SINGLE FAMILY RESIDENTIAL
SITE INSIDE OF CITY LIMIT
SITE INSIDE URBAN GROWTH AREA
DURHAM WATERSHED: F/J-B OVERLAY
STATE WATERSHED: NEUSE
WETLAND AREAS WERE DELINEATED BY SOIL & ENVIROMENTAL CONSULTANTS, PA.
R.L. HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
PROJECT VICINITY MAP
Carpenter Pointe - Phase III Drwn By: NDA
CARPENTER ROAD Clik D :
Date: 04
14 05
Durham, North Carolina Scale: 1 "= N/A
Dwg No.
1
I of l;
SITE LEGEND
D D D
D p D p D p 100 YEAR FLOOD PLAIN
.. ......... FLOODWAY
; ?--, w, PHASE LINE
? 111 Il / ` `\
1+
SHEET 4? '
% .
\ \ SHEET 3
I
I I, i'?"
50NEUSEv
STREAM BUFFER I I %i ?•%A
%
SHEET
-- ------------
---------------
- - DOVCr4L DRIVr
A I j------- ; ?, 1 ?? \\ \ 111 I ;*, ?'1 t I A, i '1 : ?:
%
%
, 1 t t
v POND %
1 L-'
e
#3 t
%
-7717
T y 77-••,/1,3-
.1x. '? y .A? ?V??
%
>` %
A
%
!. I 1 v 1 v
=
.
I
I
+? r, 1 `• i
%
%
I. ?
1 1 ! \
POND %
It II i l V ?I: I 7 - -- #2 ' V ?4.
1
--?? POND 1 1 I ? , ?`? 1100,'' I
? f ? ?? raaw w? wwi• w• „ 1,`
\ III
1 ? \
50' NEUSE
1 'l
` STREAM BUFFER
I I ,1
t ?
IQ?Dl
R.L. HORVATH ASSOCIATES
2? 16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
O'JERALL PROJECT SITE PLAN
Carpenter Pointe - Phase III Drwn By. NDA Dwg No.
Carpenter Road Chk B: 2
Date: 04 14 05
Durham, North Carolina Scale: 1 200' 2 of 8
ANNEL
O
u?
50' S BUF

1 IMPACT "
'ZONE 2 ,. -
1PRAP APRON
2'(L)x14'(W)x "(D
24"o FOP
A
R.L HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
WETLAND IMPACT #1 SITE PLAN
Carpenter Pointe - Phase III Drwn By., NDA Dwg No
Carpenter Road Chk B : 3
Date: 04 14 05
Durham, North Carolina Scale: 1 "- 40' 3 of d
IMPACT TYPE SQ. FT. LINEAR FT.
LOCATION (CH and WL) (CH ONLY)
1 NB
Z1 908 ----
Z2 701 ----
TOTAL 1,609
CH - - - -
----

(77T771-17)
R.L. HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
IMPACT
LOCATION TYPE SQ. FT.
(CH and WL) LINEAR FT.
(CH ONLY)
NB
Z I 3,070 ----
Z2 3,201 ----
TOTAL 6,091
WETLAND IMPACT #2 SITE PLAN
Carpenter Pointe - Phase III Drwn By: NDA Dwg No
Carpenter Road Chk B : 4
Date: 04 14 OS
Durham, North Carolina Scale: 1 "- 40' 4 of ti

R. L HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
IMPACT TYPE SQ. FT. LINEAR FT.
LOCATION (CH and WL) (CH ONLY)
NB
Z1 ---- ----
Z2 ---- ----
TOTAL ----
WETLAND IMPACT #3 SITE PLAN
Carpenter Pointe - Phase III Drwn By NDA DKg No
Carpenter Road Chk B : 5
Date: 04 14 OS
Durham, North Carolina Scale: 1 "- 40' of B

/? -- TOP OF DRIVEWAY
INVERT ELEV.
---- ----- _ ?--?- ? 301.92
/\/-/lam
R.L. HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
RCP PROFILE IMPACT #2
Carpenter Pointe - Phase III Drrrn By: NDA DFyg No:°
Carpenter Road Cht, By: 6
Date: 04/14/05
Durham, North Carolina Scale: f d/A 6 of Q
f
E MA i
SIZE ABOVE
PLAIN VIEW
PIPE
SIZE VARIES
CLASS I RIPRAP JUTE MAT
SEE SIZE ABOVE / SEE SIZE ABOVE
1
"`-NAT!JRAL GROUND LEVEL
TRY,-IN z xl
SECTION 'A' - 'A'
?- LEVEL SPREADER CALCULATIONS
PIPE LOCATION 0 FLOW (CFS) * RIPRAP DIFFUSER SIZE LEVEL SPREADER LENGTH xk
POND #1 6.75 9' L x 11' W x 22" D
POND #2 7.89 5' L x 7' W x 9" D 8'-8"
POND #3 3.85 12' L x 14' W x 22" D 50'-0"
* FLOW THROUGH DETENTION BASIN RISER/BARREL ONLY
** FROM NCDWQ DRAFT LEVEL SPREADER DESIGN VERSION 1.0, PIPE IS
15" OR 18" 0 RCP W/ <6 CFS OR 10 CFS RESPECTIVELY. PLUNGE
POOL WITH LEVEL SPREADER LIP IS PROVIDED
R.L. HORVATH ASSOCIATES
16 CONSULTANT PLACE, SUITE 201
r DURHAM, NORTH CAROLINA 27707
919.490.4990 FAX [phone]
LEVEL SPREADER INFORMATION
Carpenter Pointe - Phase III Drwn By: N DA
Carpenter Road Chk By.
/1405
Durham, North Carolina Date: 04 Scale: N/A
Dry;; Alo ;
7
i'
7 of 6
CLr'ES I RIPRA,
SEE SIZE ABOVE

Zarzecki:
September 15, 1999
Robert Zarzecki
S&EC,Inc.
244 West Miilbrook Road
Raleigh, N. C. 27609
-NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
ALEIGH REGIONAL OFFICE
HE !I
SEP 2 1999 ?? ;,
'U U V
Subject: Neuse River Basin Riparian Buffer Rules
NBRRO 99-215
S&EC #99-4871
Carpenter RV Resort
Durham County
On August 24, 1999 I met with you onsite and conducted a site visit. This project is referenced by the
Raleigh Regional Office as NBRRO 99-215. The features represented on the Wake County Soils and the
USGS maps were evaluated to determine their subjectivity to the Neuse Buffer Rule.
It was determined from the site visit that there is one named creek, a pond, and three features present on this
property. Panther Creek runs from property line to property line, cast to west near the northern edge, and
is are subject to the Neuse River Basin: Nutrient Sensitive Waters Management Strategy; Protection and
Maintenance of Existing Riparian Areas, Administrative Code T15A:02B.0233 (NCAC 0233).
The two features and the pond to the south of Panther Creek are not subject to the Neuse Buffer Rule. The
feature exiting the pond does become subject at S & EC Flag 113 and remains so until its confluence with
Panther Creek. The unnamed tributary to the north is subject to buffer protection from the property line to
its confluence with Panther Creek.
Thank you for your attention to this matter and if this Office can be of any assistance or if you have
additional questions, please do not hesitate to contact us.
Sincerely,
Steve Mitchell
Environmental Scientist
RRO/Dorney
Wake County
\nbrlet.for\neuse.buf Tvpark.215
9800 BAR RETT DRIVE, SUITE 101, RALEIGH, NORTH CAROLINA 27608
PHONE [phone] FAX G19-571-4718
AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/10% POST-CONSUMER PAPER

W Pik
Mil
ltxark Ral, RI20 (919)84(r59()() Fax [phone](7 // O / / \ \ ` ?, a,r/? t
CARPENTER ROAD RV RESORT ?_. v e??? 1tt1
Y- I
Project: SfiEC, INC. 994871 114 i J./.
Preliminary Wetland Approximation /
x Soiuble for Rehimin.ry Maani t Only
J63!
S&EC rep, the rigN to modify tht. map bard at more r'ielduvt• '.\
?t \ uwcypl diircatiorn.r anyalxr adJitiorul 44irnwtian
( Alr.o.im.tior• .nee m.plcd o.i?t Ior g.phic malt and V-aw trvilr% /
If Itxx area .re to be wed. they -,d b..pp -d rd
t "•'\'S p-ned by IN U.S. A Tny Corp of
M 41
1 MIII{II11
LEGEND its
- WETLANDS S.
=
;0 STREAM CHANNELS role
?? •
?? • • ? NON-IURISDICTIONAL DRAINAGE (ibis area does rte( contain waters or wetlands
•
• jurisdictional by the USACE or subject to the Nense River Riparian Buffers. Howtvcr. an
intamixent stream channel is depicted on the Durham County Soil Survey. Therefore, 335.8
verification should be obtained from the D WQ that this area is nM subject to the buffers.) '
E pate '? ? PbND
= POND (Jurisdictional water regulated by the USACE and potential subject to the Neuse River 11 I " t
Riparian BufTers.)
?? ?? • `?= POTENTIAL START POINTS OF THE 50-FOOT NEUSE RIVER BUFFERS O 3G8
®= FLOODPLAIN (Does not contain jurisdictional areas except for the stream channels.) y 1 i
r'
?_ - LM M OF EVALUATION (Me limits of evaluation extend north to the abandoned railroad) 1 \ / s5)1 I SAl'
BZ8/17199
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LEVEL SPREADER OPERATION AND MAINTENANCE AGREEMENT
LEVEL SPREADER #1, #2, AND #3
The level spreader systems are defined as the level spreaders and plunge pool velocity dissipaters.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the level spreader systems for sediment accumulation, erosion, trash accumulation, vegetated
cover, and general condition.
2. Level spreader systems or other structures that provide diffuse flow shall be maintained every six months.
All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the 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: Larry Thomas
Title: Owner
Address: 8 Consultant Place, Durham, NC 27707
Phor
Sign
Date
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 president.
I,??Xnrr? a Notary Public for the State of
County of ? ? YX??i c?lr r ? do hereby certify that \ \:' -- N -?
personally appeared before me this\-\_ day of and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
v=
pvwco
4111111110 -
SEAL
My commission expires ?_N
Page I of I
RL HORVATH ASSOCIATES, INC.
CIVIL ENGINEERS - PLANNERS - LANDSCAPE ARCHITECTS
CARPENTER POINTE PHASE III
LEVEL SPREADER DESIGN
Carpenter Pointe Phase III
Carpenter Road
Durham, North Carolina
RLH Project Number: 0433
April 20, 2005
Prepared for: D.B. Thomas Builders, Inc.
406 Wynford Ct.
Durham, North Carolina 27707
[phone]
Prepared by: RL Horvath Associates, Inc.
Engineers - Planners - Landscape Architects
P.O. Box 51806
Durham, North Carolina 27717
[phone]
Site Development • Land Planning
Residential • Commercial • Industrial • Municipal
0-77)
16 Consultant Place Suite 20127707 537 Market Street Suite LL20
P. 0. Box 51806 Durham, NC 27717 Chattanooga, TN 37402
9191490-4990 FAX [phone] 4231266-4990 FAX [phone]
CARPENTER POINTE PHASE III
LEVEL SPREADER DESIGN
General Description
The subject site is approximately 34.552 acres located on Carpenter Road. The site is
bordered to the north by Panther Creek, to the south by Carpenter Road, to the east by a
wooded area, and to the west by Carpenter Pointe Phases I and II. The site is located
outside the Durham City Limits, and inside of the F/J-B watershed. The site is located in
the Neuse River Basin and all discharges from the site are to be in the form of sheet flow.
The following narrative and accompanying calculations detail the design of the level
spreaders, bypass systems and preformed scour holes with level spreader systems.
Three dry detention basins are proposed for the site. Each basin will have a preformed
scour hole (plunge pool) and a level spreader or level spreader apron. The level spreaders
are labeled as Level Spreader #1, #2, and #3. This is consistent with the labeling of the
dry detention basins which are also labeled as Detention Basin #1, #2 and #3. The design
of each level spreader system is detailed below.
Level Spreader #1
The level spreader system for Level Spreader #1 consists of a preformed scour hole with
a level spreader apron. This is consistent with North Carolina Division of Water Quality
"Draft Level Spreader Design Options, Version 1.0". The outlet structure of the
proposed detention basin consists of an 18" diameter RCP. The peak outflow of the
detention basin in the 10-year rainfall event is 6.75 cfs, which is lower than the maximum
allowed peak flow of 10 cfs. The slope at the discharge point is relatively flat, but the
preformed scour hole will be constructed on a flat surface by cutting back into the natural
ground. This detention basin passes the runoff resulting from the 100-year storm event
with a minimum of 1-feet of freeboard entirely through the primary outlet structure. For
this reason, no emergency spillway will be required for this detention basin and no
bypass system is provided.
Level Spreader #2
Detention Basin #2 discharges into an existing draw. For this reason, a conventional
level spreader cannot be constructed. The primary outlet structure from this basin is a 15-
inch diameter RCP. The peak flow resulting from the 10-year storm event through this
pipe is 0.55 cfs. The proposed preformed scour hole and level spreader apron will be cut
into the existing ground such that it is on a flat surface. It will then discharge directly
into the existing draw. The emergency spillway is adjacent to the primary outlet structure
but will discharge into a draw that is to the side of the preformed scour hole. The bypass
flow across this spillway is approximately 23.65 cfs.
This detention basin detains the peak flow resulting from the 1-year rainfall event. In the
case of this stonn event, the emergency spillway is not activated and all of the discharge
from the basin is from the 3-inch diameter orifice in the riser of the outlet structure. The
peak flow is therefore 0.53 cfs and the preformed scour hole should serve to minimize
any further erosion in the downstream channel.
Level Spreader 93
Level spreader 93 is the most conventional of the proposed level spreaders. Detention
Basin #3 also has an emergency spillway that is activated in the 10-year storm event.
The peak flow across the emergency spillway is 59.66 cfs while the discharge through the
primary outlet structure is 3.85 cfs. The level spreader is therefore sized appropriately for
the 10-year stonn event. The emergency spillway is sited in the detention basin such that
the outflow from the spillway will discharge into a totally separate hydraulic area than the
level spreader system. Flow from both systems will only converge downstream from the
detention basin in the stream channel.
The peak flow resulting from the 1-year stonn event is 3.57 cfs through the 8-inch
diameter orifice in the side of the riser structure. This level spreader system will also
consist of a preformed scour hole that will be cut into the side of the slope such that it is
flat. The scour hole should provide some additional sediment removal prior to
discharging into the level spreader.
Conclusion
All level spreader systems are designed to best address each situation. A Level Spreader
Worksheet is provide for each level spreader system, and each level spreader system
adheres to the NC DWQ "Draft Level Spreader Design Options, Version 1.0".

Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
Draft Level Spreader Design Options Version 1.0
October 10, 2001
Using Level Spreaders to Provide Diffuse Flow Through Buffers for Compliance with Riparian Area Protection Rules
Level spreaders are one means of providing diffuse flow through protected buffers. It is always preferable to not
concentrate stormwater initially and provide as many outfalls as possible. This can reduce or even eliminate the need for
engineered devices to provide diffuse flow. However, this is not feasible in many cases. Some buffer protection rules such
as the Neuse, Catawba, and Tar-Pamlico Riparian Area Protection Rules do not allow direct discharges of stormwater
through the protected buffers. However, it is "allowable" with written approval from the DWQ to provide best management
practices (BMPs) that remove the nutrients or pollutants in question in order to discharge directly through the buffer.
These measures could include the use of the buffer itself as a forested filter strip, for instance, to remove the desired
substances. In addition to providing diffuse flow, level spreaders can be used to distribute flow into filter strips.
There are certain criteria that apply to every design that utilizes level spreaders to provide diffuse flow:
1) The entire system must safely pass a 10 year storm event without failing or causing erosion, gullies or rills.
2) The design of the level spreader must take into consideration site specific conditions such as topography, vegetative
cover, soil and other geologic conditions. If diffused flow is not attainable based on site conditions they should not be
used. (i.e. the slope of the natural ground away from or parallel to the level spreader should be relatively smooth in
the direction toward the stream so that the flow will not reconcentrate.)
3) Level spreaders should have a minimum length of ten feet and an absolute, maximum length of 300 feet.
4) It is always easier to keep flow distributed than to redistribute it after collection.
5) The type and amount of vegetative ground cover must also be considered.
6) Level spreaders must be level.
Level Spreader Design Options:
Conventional level spreader design option where entire discharge is passed through the level spreader with
no bypass conveyance for larger storms:
• For grass or thick ground cover vegetation:
i)13 feet of level spreader for every 1 cfs flow (Based on Q10 discharge)
ii) maximum length of 300 feet per level spreader
iii) Slopes of 8% or less from level spreader to top of stream bank
• For forested areas with little or no ground cover vegetation:
i) 100 feet of level spreader for every 1 cfs flow (Based on Q10 discharge)
ii) maximum length of 300 feet per level spreader
iii) slopes of 6% or less from level spreader to top of stream bank
Another conventional level spreader design technique that can be used to accommodate steeper slopes where grading is
allowed or exempt in zone 2 of protected buffers is to provide level spreaders in series as follows:
• Can be used on slopes of up to 15% for forested areas and 25% for grass or thick ground cover
• Structural level spreader just outside of zone 2 followed by a grassed berm level spreader just outside of zone 1
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), htto://h2o.enr.state.nc.us/ncwctlands/
Page 2 of 2
• Maximum Q10 discharge of 1 cfs per 100 feet of level spreader for forested areas and 1 cfs per 13 feet of level
spreader for grass or thick ground cover
In some instances, because of topography, the size and imperviousness of the drainage area, or other site constraints,
conventional level spreader designs are not appropriate. However, there are alternative designs, like the ones listed
below, that would allow a level spreader to function properly by bypassing the larger discharge events. This is based on
the assumption used in designing most water quality BMPs that the "first flush" of stormwater discharge contains the
most substances of concern. These other alternatives are "allowable (require written approval from DWQ)" for protected
buffers in the Neuse, Tar-Pamlico and Catawba basins, but would not be allowable in protected buffers of the Randleman
watershed.
Level spreader with bypass for larger drainage areas that require 85% TSS removal or where lateral constraints limit the
level spreader length severely:
• Dry detention basin designed per NCDENR Stormwater BMP Manual' sized to detain 1" rain and release it over 2-5
days" through a level spreader.
• Level spreader length based on the maximum release rate discharge
• Discharges from greater than a 1" rain can be bypassed via an appropriate conveyance such as a grassed swale (rip
rap lined ditch or pipe may be used if necessary)
• Maximum discharge of 1 cfs per 100 feet of level spreader for forested areas and 1 cfs per 13 feet of level spreader
for grass or thick ground cover
in order to meet 85% TSS Removal criteria)
Another bypass alternative can be used that would not be considered to remove 85% TSS:
• Detention basin such as a type B silt basin preceding the level spreader
• Level spreader length based on the 1" per hour intensity storm
• A system designed to bypass the greater than 1" in per hour intensity storm through an appropriate conveyance such
as a grassed swale (rip rap lined ditch or pipe may be used if necessary)
• Maximum discharge of 1 cfs per 100 feet of level spreader for forested areas and 1 cfs per 13 feet of level spreader
for grass or thick ground cover
Yet another design that can be used in very specific areas with virtually flat slopes is a Preformed Scour Hole with a Level
Spreader Apron (typical detail attached):
• Discharge area must have virtually flat slopes such as those in flood plains or wetlands
• Must be located outside of zone 2
• B = 3 x discharge pipe size for pipes of either 15 or 18 inches B= base width (see detail)
• Maximum allowable discharge (Q10) of 6 cfs for a 15 inch pipe and 10 cfs for an 18 inch pipe
• Minimum apron width of 4 feet.
Any of the above options will be considered acceptable if designed in accordance with the outlined criteria. Please keep in
mind that some of the above practices may still require written approval, for instance when a direct bypass discharge is
proposed through a protected buffer in the Neuse or Tar-Pamlico River Basin.
Am, Itl L,5Y,61, SP9649EIZ 4PJ-
DWQ Project
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following
Project Name: CARP-NTFy? pOINTe
Contact Person: Te t1 n i5 5 C+1 1'V y"
Level Spreader ID:. L
ation):
6 111
Phone Number:
Level Spreader Length ft.
Drainage Area 3 ac.
Impervious Area 1- A 3 ac.
Maximum Filter Strip/Buffer Slope %
grass
Max. Discharge from a 10 Year Storm cfs
Max. Discharge to Level Spreader b, 5 cfs
Filter Strip/Buffer Vegetation 'fhiA6hoirri? cprte
Pre-treatment or Bypass Method DRY V"C -TIM
REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)*
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and 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
_?/!>t Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.,10fg-' PACODRM&Q SCOtdR HOLE FOR IB"RCP
Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers*
If bypass method specified in the Draft Level Spreader Design Option Document:
dhl Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
* Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
HMS * Summary of Results for Pond 1
Project : 0433 Pond 1
Start of Run 02Jan05 1600
End of Run 03Jan05 1600
Execution Time 24Mar05 1428
Run Name : 10 year post
Basin Model Postdevelopment
Met. Model 10 yr post
Control Specs 1 minute dt
Computed Results
Peak Inflow 20.821 (cfs) Date/Time of Peak Inflow 03 Jan 05 0404
Peak Outflow 6.7477 (cfs) Date/Time of Peak Outflow 03 Jan 05 0417
Total Inflow 3.82 (in) Peak Storage 0.29351(ac-ft)
Total Outflow 3.81 (in) Peak Elevation 343.80(ft)
0433 Pond #1.xls
HEC-HMS Outputs
Basin Routing Summary
IIEC-HMS Projcct Name: 0433 Pond #1
Designer: Greg Brickham
Checker: John Schrum, P.E.
3/24/2005
Pre-Development Post-Development
Drainage
Point
Identification 1 Year
Discharges
(CFS) 2 Year
Discharges
(CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CPS)
1 Year Discharges
(CFS) 2 Year
Discharges
(CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CFS)
DP #1 4.74 6.67 11.55 19.12 10.13 14.32 20.32 30.75
Pond #1 N/A N/A N/A N/A 4.69 5.35 6.75 16.66
Peak Pond
Elevation
N/A
N/A
N/A
N/A
342.10
342.57
343.30
344.72
Freeboard N/A N/A N/A N/A 3.90 3.43 2.20 1.28
To of Benn 346
*Cells Nv/ values in red denote required user inputs from IIEC-II11S Outputs
Minimum 1 Foot of Freeboard Attained w/ 100-Year Storm? (+ - 4%) FYTT-71
0433 Pond #1.x1s
Stage-Storage Calcs
Stage Storage Calculations
Project Name: Carpenter Pointe- Phase III
Designer: Greg Brickham
Checker. John Schrum, P.E.
Job 4: 0433
Date: 3/24/2005
Designer: Greg Brickham
Checker: John Schrum, P.E.
3/24/2005
Average Incremental Accumulated
Contour Area Contour Contour Contour
Contour (Feet) Stage (Feet) (SF) Aica (SF) Volume (CF) Volume (CF)
340.0 0.0 1651
342.0 2.0 3288 2470 4939 4939
344.0 4.0 5192 4240 8480 13419
346.0 6.0 7361 6277 12553 25972
Storage vs. Stage
30000 -- --
25000
20000 Y = 1722.1x1.5034
tsooo Rz = 0.9989
10000
0
5000
0
0.0 1.0 2-pt, (F3-1 4.0 5.0 6.0 7.0
Ks = 1722.1
lb = 1.5034
10-Year Storm WSE = 343.80 Feet
10-Year Storm Elevation = 3.80 Feet
* 10-Year Storm Surface Area = 5069.8601 SF
10-Year Storm Volume= 12814.599 CF
Feet
Hydraulic Depth =M
*Surface Aread = Ksb(zd(b-1))
d=design storm return period in years
ICells w/ values in red denote required user inputs
0433 Pond #1.xls
Riser-Barrel Calcs
Circular Riser-Barrel Rating Curve Calculations
RiserlBarrel Scenario ==>
Constant TW Elevation =
Riser Crest =
Riser Diameter =
Barrel Diameter =
Barrel Invert In Elevation =
Barrel Manning's n =
Barrel Length =
Barrel Slope =
BalTcl Invert Out Elevation =
Number of Identical Barrels =
Cw =
Cd =
Ke =
Orifice Outlet =>
340.00 feet
344.00 feet
4 feet
18 inches
340.00 feet
0.013
36 feet
1.00 percent
?3q 64
1
3.0 Weir coefficient
0.59 Coefficient ofDischarge
1.5 Aggregate Loss Coefficient
Orifice Diameter = I ` inches
Orifice Invert = 340.0 feet
Cd = 0.59
Emergency Spillway Scenario =>
Length = 0.0 ft.
Crest Elevation = 0.0 R.
Cw = 0.0 Weir coefficient
Stage-Storage Function =>
Ks = 1722.1
b = 1.5034
Zo = 340.0
Basin Storage Basin Riser Kiser Barrel TW Barrel IlW Emergency Orifice Storage
WSEL Outflow as Wcir as Orifice Conditions Conditions Spillway
(feet) (acre-ft) (cfs) (cfs) (cfs) (cfs) (cfs) (cfs) (cfs) (ft3) (acre-ft)
340.00 0.000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0
340.25 0.005 0.33 0.00 0.00 0.00 0.00 0.00 0.33 214 0.0049185
340.50 0.014 0.93 0.00 0.00 0.00 0.00 0.00 0.93 607 0.0139445
340.75 0.026 1.71 0.00 0.00 0.00 0.00 0.00 1.71 1117 0.025653
341.00 0.040 1.63 0.00 0.00 0.00 0.00 0.00 2.63 1722 0.039534
341.25 0.055 3.21 0.00 0.00 0.00 0.00 0.00 3.22 2409 0.0552923
341.50 0.073 3.72 0.00 0.00 0.00 0.00 0.00 3.72 3168 0.0727287
341.75 0.092 4.16 0.00 0.00 0.00 0.00 0.00 4.16 3994 0.0916967
342.00 0.112 4.55 0.00 0.00 0.00 0.00 0.00 4.55 4882 0.1120828
342.25 0.134 4.92 0.00 0.00 0.00 0.00 0.00 4.92 5828 0.1337956
342.50 0.157 5.26 0.00 0.00 0.00 0.00 0.00 5.26 6828 0.1567594
342.75 0.181 5.58 0.00 0.00 0.00 0.00 0.00 5.58 7880 0.1809103
343.00 0.206 5.88 0.00 0.00 0.00 0.00 0.00 5.88 8982 0.2061933
343.25 0.233 6.17 0.00 0.00 0.00 0.00 0.00 6.17 10130 0.2325605
343.50 0.260 6.44 0.00 0.00 0.00 0.00 0.00 6.44 11324 0.2599695
343.75 0.288 6.70 0.00 0.00 0.00 0.00 0.00 6.70 12562 0.2883826
344.00 0.318 6.96 0.00 0.00 0.00 0.00 0.00 6.96 13842 0.317766
344.25 0.348 15.65 18.85 119.00 19.88 15.65 0.00 7.20 15163 0.3480891
344.50 0.379 16.20 53.31 168.29 20.45 16.20 0.00 7.44 16523 0.3793239
344.75 0.411 16.73 97.95 206.11 21.01 16.73 0.00 7.67 17923 0.4114449
345.00 0.444 17.25 150.80 237.99 21.56 17.25 0.00 7.89 19359 0.4444286
345.25 0.478 17.75 210.74 266.08 22.09 17.75 0.00 8.10 20833 0.4782533
345.50
P O.Sl3 18.24 277.03 291.48 22.61 18.24 0.00 8.32 22342 0.5128989
345.75 0.54S 18.71 349.10 314.84 23.12 18.71 0.00 8.52 23886 0.5483466
346.00 0.585 19.17 426.52 336.57 23.62 19.17 0.00 8.72 25464 0.5845788
Designer: Greg Brickham
Checker: John Schrum, P.E.
3/24/2005
'Cells w/ Values in Bold Italic Denote Dentention Basin Inputs for NEC-IINIS
*Cells iv/ Values in red denote required user inputs
?1ON'P2 L&Yr
.t irK?RaDWQ Project No.

DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following
Project Name : CAR PENTCR PolmrEr
Contact Person: BONN t' 5GHR11m/ E
Level Spreader ID:.
Level Spreader Length
Drainage Area
Impervious Area
Maximum Filter Strip/Buffer Slope
grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter Strip/Buffer Vegetation
ft.
5. Stl ac.
?.D ac.
23.1 %
no rE
RN.? cfs
0. S5 cfs
7Nttk CIt0VND L?YEa
Pre-treatment or Bypass Method
VRY251E ON
REQUIRED ITEMS CHECKLIST
Phone Number:
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)'
bsStN yr 5fg4R&6S JNro V- 06A OF
GBNCENTRA-r,5P fzmJ
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and 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
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter. PLV1q (,0 MPL 7b BEF rmi sri( oc,1 ED Z ECG //t/ SIDE o)c yie. e..
_ Pre-Form Scour Holes are on flat slopes only is " 4,-)g
No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
HMS * Summary of Results for Pond 2
Project : 0433 Pond 2
Start of Run 02Jan05 1600
End of Run 03Jan05 1600
Execution Time 30Mar05 1534
Run Name : 10 year post
Basin Model Postdevelopment
Met. Model 10 yr post
Control Specs 1 minute dt
Computed Results
Peak inflow 29.972 (cfs) Date/Time of Peak Inflow 03 Jan 05 0404
Peak Outflow 24.157 (cfs) Date/Time of Peak Outflow 03 Jan 05 0408
Total Inflow 3.92 (in) Peak Storage 0.57918(ac-ft)
Total Outflow 3.04 (in) Peak Elevation 341.65(ft)
0433 Pond #2.xls
HEC-HMS Outputs
Basin Routing Suni nary
IIEC-IMIS Project Name: 0433 Pond 2
Designer: Greg Brickham
Checker: John Schrum, P.E.
3/30/2005
Pre-Development Post-DevClopment
Drainage
Point
Identification 1 Year
Discharges
(CFS)
2 Year
Discharges (CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CFS) 1 Year
Discharges
(CFS) 2 Year
Discharges
(CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CPS)
DP /;2 0.56 N/A N/A N/A 14.95 2090 29.97 43.86
Pond IQ N/A N/A N/A N/A 0.53 3.01 24.16 40.54
Peak Pond
Elevation
NIA
N/A
N/A
N/A
340.71
341.17
341.65
341.94
Freeboard N/A N/A N/A N/A 5.29 4.83 4.35 4.06
I Top of Berm 17346.00
*Cells w/ values in red denote required user inputs from IIEC-IIIIIS Outputs
Minimum 1 Foot of Freeboard Attained w/ 100-Year Storm? (+ - 4%) YES
0433 Pond #2.xls
Stage-Storage Calcs
Stage Storage Calculations
Project Name: Carpenter Pointe
Phase: III
Designer: Greg Bricklranr
Checker: John Schrum, P.E.
Job #: 0433
Date: 4/6/2005
Designer: Greg Brickham
Checker: John Schrum, P.E.
4/6/2005
Incremental Accumulated
Contour Contour
Contour Stage Contour Average Contour Volume Volume
(Feet) (Feet) Area (SF) Area (SF) (CF) (CF)
336.0 0.0 1751
338.0 2.0 3296 2524 5047 5047
340.0 4.0 5280 4288 8576 13623
342.0 6.0 7511 6396 12791 26414
344.0 8.0 10021 8766 17532 43946
346.0 10.0 12820 11421 22841 66787
Storage vs. Stage
x0000
70000 p
60000 y= 1582.1x•5988
w 50000 R2 = 0.9969
U 40000
u 30000
R 20000
Ln
10000
0'
0.0 2.0 4.0 6.0 8.0 10.0 12.0
Stage (Feet)
Ks = 1582.1
lb = 1.5988
1-Year Storm WSE = 3.10.71 Feet
1-Year Storm Elevation= 4.71 Feet
*1-Year Storm Surface Area = 6397.8 SF
1-Year Storm Volume = 18847.8 CF
Hydraulic Deptlr = 2.95 Feet
*Surface Aread = Ksb(zd(b-1))
d=design storm return period in years
0433 Pond #2.x1s
Riser-Barrel Calcs
Riser/Barrel Scenario -
Circular Riser-Barrel Rating Curve Calculations
Constant TW Elevation -
Riser Crest =
Riser Diameter =
Barrel Diameter =
Barrel Invert In Elevation =
Barrel Manning's n =
Barrel Lengtb =
Barrel Slope =
13MTCl Invert Out Elevation -
Number of Ideutical Barrels =
Cw =
Cd -
Ke =
Orifice Outlet =>
336.00 feet
341.50 feet
4 f: cl
15 inches
336.00 feet
0.013
56 fact
1.00 percent
335.4 feet
1
3.0 Weir coelticicnt
0.59 Coefficient of Discharge
1.5 Aggregate Loss Coefficient
Orifice Diameter = 3 inches
Orifice Invert = 336.0 feet
Cd - 059
Emergency Spillway Scenario =>
Length - 10.0 ft.
Crest Elevation = 341.0 ft.
Cw= 3.0 Weir coefficicia
Stage-Storage Function =>
Ks= 1582.1
b= 1.5988
Zo = 336.0
Basin Storage Basin Riser Riser BarrelT'WBarrel 11W Emergency Orifice Storage
WSEL Outflow as Weir as Orifice Conditions Conditions Spillway
(feet) (acre-ft) (cfs) (cfs) (cfs) (cfs) (cfs) (cfs) (cfs) (ft3) (acre-ft)
336 00 0 000 0 00 0.00 0 00 0.00 0.00 0.00 0.00 0 C
336 25 0 004 0.08 0.00 0.00 0.00 0,00 000 0.08 172 0.003958882
336 50 0 011 014 0.00 0.00 000 0.00 0.00 0.14 522 0.011991108
3 36.75 0 073 0 18 0.00 0.00 0.00 0.00 0,00 0.18 999 0.02292947
337.00 0 036 0.11 0 00 0.00 0 00 0 00 0.00 0.22 1592 0.036320018
337.25 0051 075 0.00 0.00 0.00 0.00 0.00 0.25 2260 0.051890257
337.50 0 069 0.27 0.00 0 00 0010 0 00 0.00 0.27 1025 0.069451362
33775 0089 030 0.00 000 000 0.00 0.00 0.30 3871 0088861838
338.00 0110 031 0.00 0.00 0C( 0.00 000 032 4792 0110010165
33815 0.133 0.34 0.00 0.00 0.CO 0.00 0900 0634 5785 0.132805319
33850 0157 036 000 0.00 000 0.00 0.00 0676 6946 0.157171047
338.75 0 183 0 38 000 0.00 0 00 0600 0.00 0.39 7973 0.183042176
339.00 0.110 0.39 0900 0.00 0.00 000 0.00 0.39 9161 0.210362112
339.25 0239 0.41 000 0.00 0.00 0.00 000 041 10414 0239081062
339.50 0 269 0 43 0.00 0001 0900 0.00 0.00 0.43 11724 0626915475
339.75 0.301 044 0.00 0.00 0.00 0.00 0600 0.44 13092 0.300543438
340 00 0.333 0 46 0 OC 0.00 000 0.00 0.00 0.46 14515 0.333211187
34025 0.367 047 000 0.00 O.OC 0600 0.00 0,47 15992 0.367125272
340650 0.401 0.49 0.00 0.00 000 0.00 0.00 0,49 17522 0.402255718
34075 0439 0.50 0900 0000 0.00 000 0.00 0.50 19104 0.43857497
341.00 0476 031 0.00 0.on 0.00 0600 0.00 0.51 20737 0.47605739
341.25 0.515 4.18 0.00 0900 0cc 0.00 2.75 0.53 22419 0.514679362
341.50 0554 11.15 0.00 0.00 0900 0.00 10.61 0.54 24150 0.557418777
0597 3264 1985 11900 1407 13.15 149 055 25929 0595254942
0637 4347 57.71 16819 1418 13.47 30.00 0.5fi 27755 0.617169473
0 680 5571 97.95 206.11 1467 13.78 41 93 058 29627 0690141118
J 0724 6920 15090 237.99 1496 14.09 55.11 0.59 31544 0724155668
0769 8383 210.74 26608 1515 38 69.45 060 37506 0769195848
0815 9952 271.03 29149 15 061 35512 0.815246243
23 0861 11621 349.10 314.84 IS.EO U.96 101.25 0.62 37561 0.862292213
343.50 0910 13387 426.52 31637 16.07 15.27 118.59 0-63 39654 0,9103198181
343. 75 0.959 15132 504.94 356.99 1634 15.51 13611 064 41799 0959315857
344 00 1.009 171.66 595.08 37630 16.60 15.78 155.88 0 65 41964 16009267598
34115 I C60 191 81 687.69 394467 16.86 16.04 175077 0 66 46181 1.060162974
344 50 1.111 111.74 78356 412622 17.11 16.71 196,44 0.67 48419 101119904
341.75 1.165 134.41 883.52 429.05 17.36 16.56 217.86 068 50736 1.164738778
34500 1.218 25681 987.40 44514 17.61 16.82 240.00 069 53073 1118397456
345.15 1.273 279,91 109506 460.87 17.85 17.06 26185 0.70 55450 1.272956203
345.50 1.328 303 69 1205.37 475 99 18.C9 17.71 2861' 9 0 57965 1.328405177
34575 1385 31811 172112 49064 IR.71 17.55 310.57 60119 /314714901
34600 1.442 35320 1439.49 SOJB6 IR.56 17.79 775.41 62811 1.441916248
Designer: Greg Brickham
Checker: John Schrum, P.E.
3/30/2005
'Cells a/Yalues in Italic Denote Dentention Basin Irpuls jor llEC-IMIS
`Cells w/ %'aloes in bold denote required user inputs
1•171,41/ _-Ky L_cc rGc. p r n-1,,, t?-r,-
DWQ Project N
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMA
Project Name : _
Contact Person:
Level Spreader ID:
Level Spreader Length 50 ft.
Drainage Area 1 .3 ac.
Impervious Area ac.
Maximum Filter Strip/Buffer Slope S. 3 %
grass
Max. Discharge from a 10 Year Storm cfs
Max. Discharge to Level Spreader cfs
Filter Strip/Buffer Vegetation ?HIek6 UND aWk
Pre-treatment or Bypass Method 9 AY yere t4
II. REQUIRED ITEMS CHECKLIST
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for forested, leaf littler cover, 8% for thick ground cover)'
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
Initial in the space provided to indicate the follo\Mng 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 Initial
414, Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers'
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
No structures are located in protected buffers.
Plan details for the bypass and outlets are provided.
The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
mis * summary of Results for Pond 3
Project : 0433-Pond 3 revised Run Name : 10 year post
Start of Run 0lJan05 1600
End of Run 02Jan05 1600
Execution Time 2224ar05 1553
Basin Model Postdevelopment
I2et. tdodel 10 yr post
Control Specs 1 minute dt
Computed Results
Peak Inflow 66.984 (cfs)
Peak Outflow 63.511 (cfs)
Total Inflow 3.82 (in)
Total Outflow 3.80 (in)
Date/Time of Peak Inflow : 02 Jan 05 0404
Date/Time of Peak Outflow s 02 Jan 05 0406
Peak Storage 0.85107(ac-ft)
Peak Elevation 307.76(ft)./
0433 Pond #3.xls
HEC-HMS Outputs
IIEC-III\IS Outputs
HEC-HMS Project Name: 0433 Pond 0
Greg Brickham
3/24/2005
Pre-Develo went Post-Develo ment
Drainage
Point
Identification 1 Year
Discharges
(CFS) 2 Year
Discharges
(CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CFS)
1 Year Discharges
(CFS) 2 Year
Discharges
(CFS) 10 Year
Discharges
(CFS) 100 Year
Discharges
(CFS)
DP #1 10.705 15.18 26.09 43.01 33.33 45.71 66.98 99.37
Pond 91 N/A N/A N/A N/A 4.90 24.44 63.51 98.17
Peak Pond
Elevation N/A N/A N/A N/A 307.03 307.37 307.76 308.02
*Cells w/ values in bold denote required user inputs lront life:-t1A1J uutputs
Minimum 1 Foot of Freeboard Attained w/ 100-Year Storm? (+ - 4%) YES
0433 Pond #3.xls
Stage-Storage Calcs
Stale Storage Calculations
Project Name: Carpenter Pointe- Phase III
Designer: Greg IJrickham
Job 4: 0433
Date: 3/24/2005
Greg Brickham
3/24/2005
Average Incremental Accumulated
Contour Area Contour Contour Contour
Contour (Feet) Stage (Feet) (SF) Arca (SF) Volume (CF) Volume (CF)
302.0 0.0 2924
304.0 2.0 5137 4031 8061 8061
306.0 4.0 7705 6421 12842 20903
308.0 6.0 10598 9152 18303 39206
309.0 7.0 12127 11363 11363 50569
Storage vs. Stage
60000
50000
40000
U 30000
20000
0
Vn
10000
0
0.0 1.0
2.0 Stage (Feet) 4.0 5.0 6.0 7.0 8.0
1-Year Storm WSE = 307.03 Feet
1-Year Storm Elevation = 5.03 Feet
*I -Year Storm Surface Area = 8829.74 SF
1-Year Storm Volume = [30418.18 CF
Hydraulic Depth = 3.44 Feet
*Surface Aread = Ksb(zd(b-1))
d=design storni return period in years
y = 2875.9x1.4601
RZ = 0.9987
ICells w/ values in bold denote required user inputs
0433 Pond #3.x1s
Riser-Barrel Calcs
Circular Riser-Barrel Rating Curve Calculations
Riser/Barrel Scenario ==>
Constant TW Elevation =
Riser Crest =
Riser Diameter --
Barrel Diameter=
Barrel Invert In Elevation =
Barrel Mamunos n =
Barrel Length =
Barrel Slope =
Number of Identical Barrels =
Cw =
Cd =
Ke =
Orifice Outlet =>
302.00 feet
308.00 feet
4 feet
24 inches
302.00 feet
0.013
40 feet
1 percent
1.0
3.00 Weir coefficient
0.6 Coefficient of Discharge
1.5 Aggregate Loss Coefficient
Orifice Diameter = 8
Orifice Invert = 302.0
Cd = 0.59
inches
feet
Emergency Spillway Scenario =>
Length = 30.0 ft.
Crest Elevation = 307.0 ft.
Cw = 3.00 Weir coefficient
Stage-Storage Function ==>
Ks = 2875.9
b = 1.4601
Z.o = 302.0
Basin Storage Basin Kiser 1Zser Barrcl'I'WBarrel llW Emergency Orifice Storage
WSEL Outflow as Weir as Orifice Conditions Conditions Spillway
(feet) (acre-fl) (cfs) (efs) (efs) (cfs) (cfs) (efs) (cfs) (ft3) (acre-ft)
302.00 0.000 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0
301.25 0.009 0.22 0.00 0.00 0.00 0.00 0.00 0.22 380 0.008722
302.50 0.024 0.62 0.00 0.00 0.00 0.00 0.00 0.62 1045 0.0239967
302.75 0.043 1.07 0.00 0.00 0.00 0.00 0.00 1.07 1890 0.0433773
303.00 0.066 1.35 0.00 0.00 0.00 0.00 0.00 1.35 2876 0.0660216
303.25 0.091 1.58 0.00 0.00 0.00 0.00 0.00 1.58 3984 0.0914501
303.50 0.119 1.79 0.00 0.00 0.00 0.00 0.00 1.79 5199 0.1193429
303.75 0.149 1.97 0.00 0.00 0.00 0.00 0.00 1.97 6511 0.1494672
304.00 0.182 2.13 0.00 0.00 0.00 0.00 0.00 2.13 7912 0.1816435
304.25 0.216 2.29 0.00 0.00 0.00 0.00 0.00 2.29 9397 0.2157285
304.50 0.252 2.43 0.00 0.00 0.00 0.00 0.00 2.43 10960 0.2516043
304.75 0.289 1.57 0.00 0.00 0.00 0.00 0.00 2.57 12596 0.2891716
305.00 0.328 1.70 0.00 0.00 0.00 0.00 0.00 2.70 14303 0.3283452
305.25 0.369 2.81 0.00 0.00 0.00 0.00 0.00 2.82 16076 0.3690514
305.50 0.411 2.94 0.00 0.00 0.00 0.00 0.00 2.94 17913 0.4112251
305.75 0.455 3.05 0.00 0.00 0.00 0.00 0.00 3.05 19811 0.4548089
306.00 0.500 3.16 0.00 0.00 0.00 0.00 0.00 3.16 21769 0.499751
306.25 0.546 3.27 0.00 0.00 0.00 0.00 0.00 3.27 23784 0.546005
30650 0.594 3.37 0.00 0.00 0.00 0.00 0.00 3.37 25854 0.5935284
306.75 0.642 3.47 0.00 0.00 0.00 0.00 0.00 3.47 27978 0.6422827
307.00 0.692 3.57 0.00 0.00 0.00 0.00 0.00 3.57 30154 0.6922325
307.25 0.743 14.91 0.00 0.00 0.00 0.00 11.25 3.66 32380, 0.7433451
307.50 0.796 35.58 0.00 0.00 0.00 0.00 31.82 3.76 34656 0.7955903
307.75 0.849 62.30 0.00 0.00 0.00 0.00 58.46 3.85 36980 0.8489399
308.00 0.903 93.93 0.00 0.00 0.00 0.00 90.00 3.93 39351 0.9033677
303.25 0.959 144.63 18.85 119.00 44.53 34.08 125.78 4.02 41767 0.9588492
308.50 1.015 200.22 53.31 168.29 45.42 34.88 165.34 4.10 44229 1.0153615
308.75 1.073 244.02 97.95 206.11 46.28 35.67 208.35 4.19 46735 1.072883
Greg Brickham
3/24/2005
SOIL & ENVIRONMENTAL CONSULTANTS, PA
NC Division of Water Quality
Tran N Invoice Type Date Reference
7231 0617051 Invoice 06/17/05 7559.W1
Check 17unber: 17645
Date: 06/17/05 Check Amt: $200.00
Balance Discount Pay Amount
$200.00 $0.00 $200.00
PC?C D w12 p
D
JUN ? V 2005
DENR - WATER QUALITY
V, 7r W,'DS AND STORMWATER BRAIKH
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OVERALL PROJECT STORM DRAINAGE
aym
RL HORVATH ASSOCIATES Carpenter Pointe -Phase III Dn?n By. NDA Dwg No,
16 CONSULTANT PLACE, SUITE 201 Chk B : 8 DURHAM, NORTH CAROLINA 27707 Carpenter Road Date: 04/14/05
919.490.4990 FAX [phone] Durham, North Carolina 1 1 8 of 8 Scale: 00