20000034 Ver 1_COMPLETE FILE_20000111

O?O? SAT F9QG
Cl)
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
DIVISION OF WATER QUALITY
March 12, 2001
Memorandum To: John Dorney
rl/
From: Todd St. John
JSubject: DPM of the Carolinas
Cabarrus County
DWQ# 000034
Please find the attached plans for a stormwater management plan designed to remove 85%
TSS and an approval from the WRP to use the fund for mitigation. This is an after the fact impact, so I
recommend that they be required to pay the WRP within a given time frame. I also recommend that
we require the proposed stormwater facilities be built/retrofitted and operational within 60 days based
on the plans submitted by Law Engineering dated March 9, 2001. The applicant had relocated 270
feet of perennial channel (according to our records and the permit application). As such, 270 feet of
mitigation should be required. They have proposed paying into the WRP. I recommend that we issue
the 401 WQC provided that they maintain the stormwater facilities and mitigate for the stream
impacts.
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)
!1111 7 4?on /..L.......1 n4n 14. GM'' 11....1 hN..•//Mn......r ni..+.. r... .... /.........II.....J../

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NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
Mr. Michael Iagnocco
LAW Engineering
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Dear Mr. Iagnocco
Subject: Project Name: DPM of
DWQ 000034
County: Cabarrus

3
i
The purpose of this letter is to notify you that the North Carolina Wetlands
Restoration Prograin (NCWRP) will accept payment for stream impacts associated
with the subject project in accordance with the Memorandum of Understanding
between the North Carolina Department of Environment and Natural Resources and
the U.S. Army Corps of Engineers dated November 4, 1998. Based on information
supplied by you in a fax dated August 2, 2000, an application requesting
authorization to impact 270 linear feet of stream channel has been submitted for the
subject project. The NCWRP will provide mitigation as specified in the 401 Water
Quality Certification and/or Section 404 permit (up to 350 linear feet of stream
restoration) for impacts associated with the subject project in Cataloging Unit
03040105 of the Yadkin River basin.
If you have any questions or need additional information, please contact
Crystal Braswell at [phone].
REF/cvb
cc: John Domey Wetlands/401 Unit
Steve Chapin, USACOE
Michael Parker, DWQ-MRO
file
August 18, 2000
s
t. ?
Sincerely,
Ronald E. Ferrell,
Program Manager

WETLANDS RESTORATION PROGRAM
1619 MAIL SERVICE CENTER, RALEIGH, NC 27699-1 6 1 9
website: h2o.enr.state.nc.us PHONE [phone] FAX [phone]
AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/10% POST-CONSUMER PAPER
mitigation
Subject: mitigation
Date: Fri, 11 Aug 2000 1.4:01:06 -0400
From: Jeff Jurek <[e-mail]>
Organization: NC Wetlands Restoration Program-DENR
To: Peter Colwell <[e-mail]>, Rob Ridings <rob. ridings @ ncmail.net>
The purpose of this email is to notify you of the North Carolina
Wetlands
Restoration Program's (NCWRP) intention to accept payment into the
Wetland
Restoration Fund for compensatory mitigation for stream/wetland impacts
for
the following project:
Project name:DPM of the Carolinas
River Basin: Yadkin
8digit catalog unit: 03040105
County: Cabarrus
DWQ Project # (if known): 000034
COE Project # (if known):
CAMA Project # (if known):
Wetland impact:
Stream impact: 270 ft
Wetland mitigation:
Stream mitigation: 350 ft
If for any reason you feel that the NCWRP should not accept payment for
the
above project, please notify me (Jeff Jurek) by email or phone 919
733-5316
within 5 working days upon receipt of this message. If no response is
received within 5 working days, NCWRP assumes you concur with this
payment.
..
Jeff Jurek <[e-mail]>
1 of 1 8/11/00 2:06 PM
Michael F. Easley
Governor
Sherri Evans-Stanton, Acting Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
March 20, 2001
Cabarrus County
DWQ Project # 000034
APPROVAL of 401 Water Quality Certification and ADDITIONAL CONDITIONS, WRP
DPM of the Carolinas
80 Spring Street SW
Concord, NC 28025
Dear Sirs:
You have our approval, in accordance with the attached conditions and those listed below, to
place fill material in 270 linear feet of streams for the purpose of constructing a commercial development at
US 29/601 intersection in concord, NC in Cabarrus County, as you described in your application dated
January 10, 2000 and March 9, 2001. After reviewing your application, we have decided that this fill is
covered by General Water Quality Certification Number 2671. This certification allows you to use
Nationwide Permit Number 26 when the Corps of Engineers issues it. In addition, you should get any other
federal, state or local permits before you go ahead with your project including (but not limited to) Sediment
and Erosion Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed regulations. This
approval will expire when the accompanying 404 or CAMA permit expires unless otherwise
specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application except as
modified below. If you change your project, you must notify us and you may be required to send us a new
application for a new certification. 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
wetland fills for this project (now or in the future) exceed one acre, compensatory mitigation may be
required as described in 15A NCAC 2H .0506 (h). For this approval to be valid, you must follow the
conditions listed in the attached certification and any additional conditions listed below.
1. Deed notifications or similar mechanisms shall be placed on all remaining jurisdictional wetlands and
waters to notify the state in order to assure compliance for future wetland and/or water impact. These
mechanisms shall be put in place within 30 days of the date of this letter or the issuance of the 404 Permit
(whichever is later).
2. An additional condition is that a final, written stormwater management plan shall be approved by this Office
before the impacts specified in this Certification occur. The stormwater management plan must be
built/retro--filled and operational within 60 days based on the-plans submitted by Law Engineering dated - - - -
March 9, 2001. Also, before any permanent building is occupied at the subject site, the stormwater
management facilities, as approved by this Office, must be constructed and operational, and the
stormwater plan, as approved by this Office, shall be implemented.
. We understand that you have chosen to contribute to the Wetland Restoration Program in order to
compensate for these impacts to wetlands and/or streams. In accordance with 15A NCAC 2R .0402, this
contribution will satisfy ou_r compensatory mitigation requirements under 15A NCAC 2H .0506(h).
According to 15A NCAC 2H .0506(h), feet of restoration will be required. Until the Wetland Restoration
Program receives and clears your check (made payable to:, DENR - Wetland Restoration Program),
wetland or stream fill shall not occur. Mr. Ron Ferrell should be contacted at 919-733-5083 ext. 358 if you
have any questions concerning the Wetland Restoration Program. You have one month from the date of
this Certification to make this payment.
NCDENR
Division of Water Quality 1650 Mail Service Center Raleigh, NC 27699-1650
Wetlands/401 Unit: [phone]
Fax: [phone]
F WAIF
Michael F. Easley
\0?0 G
9Q Governor
r Sherri Evans-Stanton, Acting Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
NORTH CAROLINA-DIVISON OF WATER QUALITY
401 WATER QUALITY CERTIFICATION
SUMMARY OF PERMITTED IMPACTS AND MITIGATION REQUIREMENTS
In accordance with 15A NCAC 2 H .0500, DPM of the Carolinas has permission as outline below for
the purpose(s) of proposed commercial development. All activities associated with these authorized
impacts must be conducted with the conditions listed in the attached certification transmittal letter. THIS
CERTIFICATION IS NOT VALID WITHOUT THE ATTACHMENTS.
COMPENSATORY MITIGATION REQUIREMENT WETLAND RESTORATION PROGRAM
LOCATION
COUNTY:
BASIN/SU BBASI N
Hwy 29/601 Site
Cabarrus
030712
As required by 15A NCAC 2H .0506, and the conditions of this, certification, you are required to
compensate for the above impacts through the restoration, creation, enhancement or preservation of
wetlands and surface waters as outlined below prior to conducting any activities that impact or degrade the
waters of the state.
Note: Acreage requirements proposed to be mitigated through the wetland Restoration Programs must be
rounded to one-quarter acre increments according to 15 2r.0503(b)
acres of Class WL wetlands
acres of riparian wetland
acres of non-riparian wetlands
acres of Class SWL wetlands
270 linear feet of stream buffers
(other)
One of the options you have available to satisfy the compensatory mitigation requirements is
through the payment of a fee to the Wetlands Restoration Fund per NCAC 2R .0503. If you choose this
option, please sign this form and mail it to the Wetlands Restoration Fund at the address listed below. An
invoice for the appropriate amount of payment will be sent to you upon receipt of this form. PLEASE
NOTE, THE ABOVE IMPACTS ARE NOT AUTHORIZED UNTIL YOU RECEIVED NOTIFICATION THAT
YOUR PAYMENT HAS BEEN PROCESSED BY THE WETLANDS RESTORATION PROGRAM. - - - --
Signature
Date
WETLANDS RESTORATION PROGRAM
DIVISON OF WATER QUALITY
1619 Mail Service Center
RALEIGH, N.C. 27669-1619
[phone]
E
Division of Water Quality
Wetlands/401 Unit: [phone]
Fax: [phone]
1650 Mail Service Center Raleigh, NC 27699-1650
o? W A r?9Q?
Michael F. Easley
Governor
Sherri Evans-Stanton, Acting Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
DWQ Project No.:
Applicant:
Project Name:
Date of Issuance of 401 Water Quality Certification:
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 this certificate
to the 401/Wetlands Unit, North Carolina Division of Water Quality, 1621 Mail Service Center,
Raleigh, NC, 27699-1621.This form may be returned to DWQ by the applicant, the applicant's
authorized agent, or the project engineer. It is not necessary to send certificates from all of these.
Applicant's Certification
I, , hereby state that, to the best of my abilities, due care
and diligence was used in the observation of the construction such that the construction was
observed to be built within substantial compliance and intent of the 401 Water Quality Certification
and Buffer Rules, the approved plans and specifications, and other supporting materials.
Signature: Date:
Agent's Certification
I, , hereby state that, to the best of my abilities, due care
and diligence was used in the observation of the construction such that the construction was
observed to be built within substantial compliance and intent of the 401 Water Quality Certification
and Buffer Rules, the approved plans and specifications, and other supporting materials.
Signature: Date:
If this project was designed by a Certified Professional
I, , as a duly registered Professional (i.e.,
Engineer, Landscape Architect, Surveyor, ect.) in the State of North Carolina, having been
authorized to observe (periodically, weekly, full time) the construction of the project, for.the
Permittee hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the construction such that the construction was observed to be built within
substantial compliance and intent of the 401 Water Quality Certification and Buffer Rules, the
approved plans and specifications, and other supporting materials.
Signature ---Registration No. _ _ . _ _ _ _ - -Date
*A
NC1EA.
Division of Water Quality 1650 Mail Service Center Raleigh, NC 27699-1650
Wetlands/401 Unit: [phone]
Fax: [phone]
County:
O?OF W ATFRQG
Michael F. Easley
Governor
r Sherri Evans-Stanton, Acting Secretary
> Department of Environment and Natural Resources
o
Kerr T. Stevens
Division of Water Quality
For accounting purposes, this Certification authorizes the fill of 030712 river and subbasin
and 270 linear feet of stream restoration are required. Please be aware that the Wetland
Restoration Program (WRP) rules require rounding of acreage amounts to one-quarter acre
increments (15A 2R .0503(b)).
If you do not accept any of the conditions of this certification, 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, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and its conditions
are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean
Water Act. If you have any questions, please telephone John Domey at 919-733-9646.
Attachment
cc: Corps of Engineers Asheville Field Office
Mooresville DWQ Regional Office
Ron Ferrell; Wetland Restoration Program
File copy
Central Files
Todd St. John
William Pritt; LawGibb Group
Mike Ingnocco; Law Environmental
av?
OEiift
Sincerely,
to s

Division of Water Quality 1650 Mail Service Center Raleigh, NC 27699-1650
Wetlands/401 Unit: [phone]
Fax: [phone]
O?O? W AT ?RQG
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr'I. Stevens
Division of Water Quality
!i
April 4, 2001
Mr. Todd Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, NC 28025
Re
Dear Mr. Dickens:
DPM of the Carolinas
Cabarrus County
DWQ # 000034
This Office is in receipt of the plans dated March 9, 2001 for the stormwater management ponds at the
subject facility prepared on your behalf by Law Engineering. Staff from the Wetlands Unit reviewed the plans
and found them acceptable. Please note that this approval shall not be construed as an approval of the dam
design for Dam Safety purposes.
If you have any questions regarding this matter, please contact Mr. Todd St. John at [phone].
cc: Mooresville DWQ Regional Office
Todd St. John
Central Files
Dave Penrose
600/1r. Michael lagnocco, LawGibb, 2801 Yorkmont Road, Charlotte, NC 28208
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)
nin moo 400 i..i..--- % non Tic aao? Is-% tiw...in,n....... ..s.,s.. .... .... i------ "--A-1
W AT ?RpG
co r
o ?
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
April 4, 2001
Mr. Todd Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, NC 28025
Re: DPM of the Carolinas
Cabarrus County
DWQ # 000034
Dear Mr. Dickens:
This Office is in receipt of the plans dated March 9, 2001 for the stormwater management ponds at the
subject facility prepared on your behalf by Law Engineering. Staff from the Wetlands Unit reviewed the plans
and found them acceptable. Please note that this approval shall not be construed as an approval of the dam
design for Dam Safety purposes.
If you have any questions regarding this matter, please contact Mr. Todd St. John at [phone].
cc: Mooresville DWQ Regional Office
Todd St. John
Central Files
Dave Penrose
Mr. Michael lagnocco, LawGibb, 2801 Yorkmont Road, Charlotte, NC 28208
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)
non 'n9 4- /-L -....N n•n -C ca-'30 K....A L.N... NL.n.. n... ..•.. •.+.... uw /.........•L....dnl

WATER
II ?QG
y
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
DIVISION OF WATER QUALITY
March 12, 2001
Memorandum To: John Dorney
From: Todd St. John
Subject: DPM of the Carolinas
Cabarrus County
DWQ# 000034
Please find the attached plans for a stormwater management plan designed to remove 85%
TSS and an approval from the WRP to use the fund for mitigation. This is an after the fact impact, so
recommend that they be required to pay the WRP within a given time frame. I also recommend that
we require the proposed stormwater facilities be built/retrofitted and operational within 60 days based
on the plans submitted by Law Engineering dated March 9, 2001. The applicant had relocated 270
feet of perennial channel (according to our records and the permit application). As such, 270 feet of
mitigation should be required. They have proposed paying into the WRP. I recommend that we issue
the 401 WQC provided that they maintain the stormwater facilities and mitigate for the stream
impacts.
C
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)
nin 700 I7On /..L........\ nin 74= C0137 /1....N
t,u...//wn.......,.a..?.. ..,. .... /.........al.....ln/
APR 03 2001 15:19 FR ENVIROMENTAL 7043571622 TO 919197336893 P.01/01
LAW
LAWGIBB Group Member
FACSIMILE TRANSMYTTAL SHEET
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
2801 Yorkmont Road
Claurlette, North Carolina 28208
To: -To DO -1'. J? +1 From: ,
Companyt I)ENIL - W a Date Transmitted., `f is /01
Phone Number: % 1'157?)15 194 Telephone Number: 704-357-8600
Fax Number: 9 1 9 7 3 3 ( 59 '?), Fax Number: -704-357-8638
-WM E401 er avAs.t t,i C-?C.T.
Subject. 'D m a 11; O G 4
Hard Copy to follow: Yes No
Number of pages transm;tted (iinel. cover):
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CONIrIDENTIALITY NOTIM This message Is Intended only for the use of the Individual or entity to which it to addressed, and
contain informatioo that is priv,7eggid, confidential, and exempt Prom disclosure under applicable law. If the reader of this message is not
the intended recipienl, or the emplpyee or agent respopsible for delivering the message to the intended recipient, you arc lereby notified
that any diascminrtion, distribution, or copying of this comrnUni"HOU is africtty PFQnistitcd, ItyQU hp Vg reseiVed tbb eommunieadoo in
error, please notify us immediately by telephone and return the original mcssagc to na at the above address via the US Postal Service.
nonk You
If transmission is not received In good order, please call
** TOTAL PAGE.01 **

LAWGII]BBB
GROUn
March 9, 2001
Mr. Todd St. John
N.C. DENR Division of Water Quality, Wetlands Unit
2321 Crabtree Boulevard, Suite 250
' Raleigh, N.C. 27604-2260
Subject: DPM of the Carolinas, HWY 29/601
' 401 Water Quality Certification Requirements
Cabarrus County
DWQ # 000034
' LAW Project No. 30100-1-0020
1;,/T f7l>

' Dear Mr. St. John:
In accordance with our telephone discussions on March 2, and March 5, we have reviewed the proposed
Stormwater Management Plan for the DPM of the Carolinas (DPM) HWY 29/601 site. Based on this
' review and your comments, we have made modifications to the Plan necessary to comply with the 401
Water Quality Certification requirements.
The modifications proposed consist of an additional length of Grassed Swale and revisions to the outlet
works for the Extended Dry Detention Basin. Attached are details supporting the revisions to the Plan that
we propose, including revised figures, tables and associated design calculations. This information
supercedes any conflicting information contained in the report we submitted to you on February 22, 2001
' entitled "Report of Stormwater Management for DPM of the Carolinas, Concord, North Carolina".
It is our understanding that pending your review and approval of the attached information, DPM can
' proceed with construction of the proposed Plan facilities. We further understand that, upon completion of
the work DPM will have then met the 401 Water Quality Certification BMP requirements for the site.
Please confirm our understanding or advise as to what additional information or actions will be required.
If you need additional information or have any questions, please do not hesitate to call us at (704) 357-
8600.
J
L

Sincerely,
ALAWineer",
Senior Engineer
cc: Mr. Bo Dickens
Attachments
Services, Inc.
Scott D. Stone
Managing Principal
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 • Charlotte, NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area of over 50 years

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Summary of Revisions to
Proposed Stormwater Management Plan for
HWY 29/601 DPM of the Carolinas Site
Concord, Cabarrus County, N.C.
DWWQ # 000034
A review of the above referenced Stormwater Management Plan by Mr. Todd St. John of
the N.C. DENR Division of Water Quality (DWQ), raised several questions about
drainage areas contributing to the Best Management Practices (BMP) facilities proposed
for the site. Mr. St. John also had questions about the associated impervious areas for full
site build out. In discussions about the design assumptions in the report, Mr. St. John
indicated that the BMP's proposed for the site would have to function for all contributing
drainage areas, assuming full site development.
As a result of these discussions, and design criteria clarifications, the contributing area
and imperviousness assumptions were re-evaluated and revised to more accurately reflect
current and proposed site drainage and development conditions. These revisions in turn
necessitated revisions to the proposed design of both the Grassed Swale and Extended
Dry Detention Basin BMP's proposed for the site. The following paragraphs and the
attached tables, figures, and calculations explain all of the proposed modifications to the
Stormwater Management Plan previously submitted to DWQ. The information presented
here supercedes any conflicting information contained in the original report.
Site drainage areas contributing to the proposed BMP's as well as surface and subsurface
drainage patterns and impervious surfaces at full site buildout were re-assessed and
revised as shown on the attached Figure 1 (revised). The corresponding revised
hydrologic data for the site is shown in the attached Table 1 (revised). The revisions to
the contributing drainage areas and the associated percent impervious assumptions
necessitated revisions to both the Grassed Swale BMP design and the Extended Dry
Detention Basin BMP design. The following paragraphs discuss the revisions proposed
for each BMP. Supporting assumptions and calculations are included as an appendix to
this summary
Grassed Swale
The results of the drainage area re-evaluation, and DWQ's requirement that a Grassed
Swale BMP's length be determined according to the entire contributing drainage area, not
just the contributing impervious area, will require that the proposed length of swale be
increased to 290 linear feet (L.F.). This is based on the criteria of 100 L.F. of swale per
acre for 2.9 acres of contributing area. This added length of swale can be accomplished
by adding a 75-foot length of Swale along the southern property boundary, as shown on
the attached Figure 2 (revised). The revised swale will handle the runoff from 0.75-acre
contributing to the swale from sub-basins 5 and 6, and from the "out-tract" adjacent to the
southeast comer of the site. The original 224 L.F. swale will be used to treat runoff from
the remaining 2.15 acres of contributing area at full site build-out. Table 1 (rev.) presents
the details of contributing areas to each of the swales, by sub-basin.

Extended Drv Detention Basin
The Extended Dry Detention Basin, as proposed, provides sufficient volume to capture
the runoff from the 1-inch storm event, for full site build-out. It also has sufficient
volume to serve as a stormwater detention facility for the 10-year design storm. This
basin is sized to include a 20 percent sediment storage volume as well, per DWQ's
guidelines.
However, the outlet works as initially proposed will need to be modified so that the basin
will function properly as a BMP for full site buildout conditions. The proposed outlet
facilities will need to be modified as follows:
? The orifice for discharge of the 1-inch storm event runoff will need to beset at
elevation 624.0. The opening size of the orifice remains at 1 square inch, to achieve
draw down of this detained runoff over the 2 day minimum period
The outlet riser pipe crest elevation will need to be revised to activate at 627.0
? The emergency spillway crest is proposed to be set at elevation 628.5.
Storm routings through the revised basin, for a range of return frequency events were
performed and the results are as follows:
Storm Event Maximum Peak Outflow Rate Freeboard*
Frequency WSEL in BMP (cfs) (feet)
2-year 627.3 1.3 2.0
10-year 628.4 3.1 0.9
50-year 628.8 11.6 0.5
100-year 628.9 14.6 0.4
*Maximum Top of Berm elevation is 629.3
I
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Appendix
Assumptions and Calculations
for Revisions to
Proposed Stormwater Management Plan for
HWY 29/601 DPM of the Carolinas Site
Concord, Cabarrus County, N.C.
DWWQ # 000034

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... ............................

JOB NO. SHEET OF
PHASE TASK
JOB NAME. LJf ' { yk- L GC i a ??""-?

BY DATE
CHECKED BY DATE 319 A
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DPM of the Carolinas
HWY 29/601 Site (DWQ # 000034)
TABLE 1 rev Site Hydrologic Conditions for Full Site Buildout
Area
Area NOT Draining to Area ProRata "C"
Sub-Basin Draining to Swale/Basin Runoff for Total Area
Number Total Area Swale/Basin Total Pervious Impervious Coefficient to Swale/Basin
(See Figure 1 rev) (acres) (acres) (acres) (acres) (acres) "C" (area/total) X (area "C")
1 0.60 0.20 0.40
0.12 0.30 0.01

-
-
- 0.28. 0.95 0.09
-
-----
2 --
-
-
0.40 ------
0.40 ----
0.00 ----- ----- ----- ----------
-------
3
------- -----
0.23
----- ------
0.00
-- ----
0.23 ----- -----
0.23 -----
0.95 ----------
0.08

4
0.59 ----
0.00 ----
0.59 ----- -----
0.59 -----
0.95 ----------
0.19
-
-------
5 -----
0.79 ------
0.00 ----
0.79 ----- ----- ----- -
--------
0.39 0.95 0.13
0.26 0.55 0.05

-- 0.14 0.30 0.01
-------
6 --
-
1.30
- ------
0.60 ----
0.70 -----
0.70 ----- -----
0.30 ----------
0.07
-------
7
- ---
-
0.09 ------
0.09 ----
0.00 ----- ----- ----- ----------
0.00
------
Out-tract at -----
0.19 ------ -----
0.19 ----- ----
0.19 ----
0.95 ---- -----
0.06
So.East Corner
TOTAL 4.19 1.29 2.90 1.22 1.68 0.69

JOB NO. 3) tUPr I'-COZO SHEET ! OF i
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CHECKED BY WW DATE 3 '? G
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BY DATE -31314)1
CHECKED BY DATE a
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4
Outlet Structure Configuration
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Outlet Structure Configuration for DPM Detention Basin Design
Stage 1: Rectangular Orifice
Invert Elevation = 624 feet
Width = .1 feet
Height = .1 feet
Discharge Coefficient = .6
Stage 2: Riser Pipe
Crest Elevation = 627 feet
Effective Perimeter = 2.1 feet
Effective Flow Area = .35 square feet
Discharge Coefficient = 3.1
Stage 3: Emergency Spillway
Crest Elevation = 628.5 feet
Crest Length = 15 feet
Discharge Coefficient = 3

Basin Rating Curve
Outlet Rating Table for DPM Detention Basin Design
Basin Basin Riser Box Tailwater Outfall
Water Outflow Water Elevation Culvert
Elevation (cfs) Elevation (ft) Control
623.00 0.00 N/A N/A N/A
623.25 0.00 N/A N/A N/A
623.50 0.00 N/A N/A N/A
623.75 0.00 N/A N/A N/A
624.00 0.00 N/A N/A N/A
624.25 0.02 N/A N/A N/A
624.50 0.03 N/A N/A N/A
624.75 0.04 N/A N/A N/A
625.00 0.05 N/A N/A N/A
625.25 0.05 N/A N/A N/A
625.50 0.06 N/A N/A N/A
625.75 0.06 N/A N/A N/A
626.00 0.07 N/A N/A N/A
626.25 0.07 N/A N/A N/A
626.50 0.08 N/A N/A N/A
626.75 0.08 N/A N/A N/A
627.00 0.08 N/A N/A N/A
627.25 0.90 N/A N/A N/A
627.50 1.88 N/A N/A N/A
627.75 2.28 N/A N/A N/A
628.00 2.62 N/A N/A N/A
628.25 2.92 N/A N/A N/A
628.50 3.20 N/A N/A N/A
628.75 9.07 N/A N/A N/A
629.00 19.59 N/A N/A N/A
629.25 33.13 N/A N/A N/A

Discharge
(cfs)
34.0
27.2
20.4
13.6
6.8
0.0
6
Stage-Discharge Curve
).0
u?uFVC seg PIPe I MtiPb q
Set LL WA?
Elevation (feet)
3vIOD-l-oe2,D
' pPM 313161 14?G
Modified Puls Routing F11TU -?
Inflow Hydrograph: G:\PROJECTS\30140E-1\STORMW-1\DPM-CA-I\DESIGN\FUT-2.HYD
' Storage/Elevation Curve: G:\PROJECTS\30140E-1\,STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINALFUT.E,
1 Basin Bypass Capacity = 0.0 cfs
Starting Pool Eleva tion = 624.00 feet
Time Interval =.025 hours

Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
' (hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.00 0.00 0.00 0.014 624.00 0.00 0.00
0.03 0.38 0.38 0.014 624.01 0.00 0.00
0.05 0.77 0.77 0.016 624.03 0.00 0.00
0.08 1.15 1.15 0.018 624.06 0.01 0.01
' 0.10 1.54 1.54 0.020 624.11 0.01 0.01
0.13 2.07 2.07 0.024 624.17 0.02 0.02
0.15 2.60 2.60 0.029 624.25 0.02 0.02
' 0.18 3.14 3.14 0.035 624.35 0.03 0.03
0.20 3.67 3.67 0.042 624.47 0.03 0.03
0.23 5.19 5.19 0.051 624.63 0.04 0.04
' 0.25 6.72 6.72 0.063 624.84 0.04 0.04
0.28 8.24 8.24 0.078 625.10 0.05 0.05
' 0.30
0.33 9.76
8.72 9.76
8.72 0.097
0.116 625.42
625.74 0.06
0.06 0.06
0.06
0.35 7.68 7.68 0.133 626.03 0.07 0.07
' 0.38
0.40 6.64
5.60 6.64
5.60 0.147
0.160 626.28
626.49 0.07
0.07 0.07
0.07
0.43 4.86 4.86 0.170 626.67 0.08 0.08
' 0.45
0.48 4.11
3.36 4.11
3.36 0.179
0.187 626.83
626.96 0.08
0.08 0.08
0.08
0.50 2.61 2.61 0.193 627.06 0.27 0.27
' 0.53
0.55 2.45
2.29 2.45
2.29 0.197
0.201 627.13
627.19 0.52
0.72 0.52
0.72
0.58 2.12 2.12 0.204 627.24 0.88 0.88
0.60 1.96 1.96 0.206 627.28 1.03 1.03
0.63 1.78 1.78 0.208 627.31 1.14 1.14
0.65 1.60 1.60 0.209 627.33 1.21 1.21
0.68 1.42 1.42 0.209 627.34 1.25 1.25
' 0.70 1.24 1.24 0.209 ` 627 34 1.26 1.26
0.73 1.19 1.19 0.209 627.34 1.25 1.25
0.75 1.13 1.13 0.209 627.34 1.24 1.24
0.78 1.08 1.08 0.209 627.33 1.22 1.22
0.80 1.03 1.03 0.209 627.33 1.20 1.20
0.83 0.99 0.99 0.208 627.32 1.18 1.18
' 0.85 0.95 0.95 0.208 627.31 1.15 1.15
0.88 0.91 0.91 0.207 627.31 1.12 1.12
' 0.90 0.87 0.87 0.207 627.30 1.09 1.09

Event Hydrograph Basin Storage Elevation Basin Outflow
' Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.93 0.84 0.84 0.206 627.29 1.06 1.06
0.95 0.80 0.80 0.206 627.28 1.03 1.03
0.98 0.77 0.77 0.206 627.28 1.00 1.00
1.00 0.74 0.74 0.205 627.27 0.97 0.97
1.03 0.72 0.72 0.205 627.26 0.94 0.94
1.05 0.69 0.69 0.204 627.25 0.91 0.91
i 1.08 0.67 0.67 0.204 627.24 0.88 0.88
1.10 0.65 0.65 0.203 627.24 0.86 0.86
1.13 0.63 0.63 0.203 627.23 0.83 0.83
' 1.15 0.61 0.61 0.202 627.22 0.81 0.81
1.18 0.59 0.59 0.202 627.22 0.79 0.79
' 1.20
1.23 0.57
0.55 0.57
0.55 0.202
0.201 627.21
627.20 0.76
0.74 0.76
0.74
1.25 0.54 0.54 0.201 627.19 0.72 0.72
1.28
1.30 0.52
0.50 0.52
0.50 0.200
0.200 627.19
627.18 0.70
0.68 0.70
0.68-
1.33 0.49 0.49 0.200 627.18 0.66 0.66
1.35
1.38 0.48
0.46 0.48
0.46 0.199
0.199 627.17
627.16 0.64
0.62 0.64
0.62
1.40 0.45 0.45 0.199 627.16 0.60 0.60
1.43
1.45 0.44
0.43 0.44
0.43 0.198
0.198 627.15
627.15 0.59
0.57 0.59
0.57
1.48 0.42 0.42 0.198 627.14 0.55 0.55
' 1.50
1.53 0.41
0.40 0.41
0.40 0.198
0.197 627.14
627.13 0.54
0.52 0.54
0.52
1.55 0.39 0.39 0.197 627.13 0.51 0.51
1.58 0.38 0.38 0.197 627.13 0.49 0.49
' 1.60 0.37 0.37 0.197 627.12 0.48 0.48
1.63 0.36 0.36 0.196 627.12 0.47 0.47
1.65 0.35 0.35 0.196 627.11 0.46 0.46
1.68 0.34 0.34 0.196 627.11 0.44 0.44
1.70 0.34 0.34 0.196 627.11 0.43 0.43
1.73 0.33 0.33 0.196 627.10 0.42 0.42
1.75 0.32 0.32 0.195 627.10 0.41 0.41
1.78 0.32 0.32 0.195 627.10 0.40 0.40
1.80 0.31 0.31 0.195 627.09 0.39 0.39
1.83 0.30 0.30 0.195 627.09 0.38 0.38
1.85 0.30 0.30 0.195 627.09 0.37 0.37
1.88 0.29 0.29 0.195 627.09 0.36 0.36
' 1.90 0.28 0.28 0.194 627.08 0.36 0.36
1.93 0.28 0.28 0.194 627.08 0.35 0.35
1.95 0.27 0.27 0.194 627.08 0.34 0.34
' 1.98 0.27 0.27 0.194 627.08 0.33 0.33
2.00 0.26 0.26 0.194 627.07 0.33 0.33
2.03 0.26 0.26 0.194 627.07 0.32 0.32
' 2.05 0.25 0.25 0.194 627.07 0.31 0.31
2.08 0.25 0.25 0.193 627.07 0.31 0.31
2.10 0.24 0.24 0.193 627.07 0.30 0.30
Event Hydrograph Basin Storage Elevation Basin Outflow
' Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
2.13 0.24 0.24 0.193 627.06 0.29 0.29
2.15 0.24 0.24 0.193 627.06 0.29 0.29
2.18 0.23 0.23 0.1§3 627.06 0.28 0.28
' 2.20 0.23 0.23 0.193 627.06 0.28 0.28
2.23 0.22 0.22 0.193 627.06 0.27 0.27
2.25 0.22 0.22 0.193 627.06 0.27 0.27
' 2.28 0.22 0.22 0.193 627.05 0.26 0.26
2.30 0.21 0.21 0.193 627.05 0.26 0.26
2.33 0.21 0.21 0.192 627.05 0.25 0.25
' 2.35 0.21 0.21 0.192 627.05 0.25 0.25
2.38 ..0.20 0.20 0.192 627.05 0.24 0.24
2.40 0.20 0.20 0.192 627.05 0.24 0.24
' 2.43 0.20 0.20 0.192 627.05 0.23 0.23
2.45 0.19 0.19 0.192 627.04 0.23 0.23
2.48 0.19 0.19 0.192 627.04 0.23 0.23
' 2.50 0.19 0.19 0.192 627.04 0.22 0.22
Total Routing Mass Balance Discrepancy is 0.01%
I
I

-SDltfD-I-of3ZO
DPM 313J01 M(-
Modified Puls Routing 10 JK
Inflow Hydrograph: G:\PROJECTS\30140E-1\.STORMW-I\DPM-CA--I\DESIGN\FUT-10.HYD
' Storage/Elevation Curve: G:\PROJECTS\30140E-1VSTORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINALFUT.E-
' Basin Bypass Capacity = 0.0 cfs
Starting'Pool Elevation = 624.00 feet
Time Interval = .025 hours
'
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used • Above MSL Outflow Total
' (hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.00 0.00 0.00 0.014 624.00 0.00 0.00
' 0.03 0.73 0.73 0.015 624.01 0.00 0.00
0.05 1.47 1.47 0.017 624.05 0.00 0.00
0.08 2.20 2.20 0.021 624.12 0.01 0.01
' 0.10 2.94 2.94 0.026 624.21 0.02 0.02
0.13 3.69 3.69 0.033 624.32 0.02 0.02
0.15 4.45 4.45 0.041 624.47 0.03 0.03
' 0.18 5.20 5.20 0.051 624.63 0.04 0.04
0.20 5.95 5.95 0.063 624.83 0.04 0.04
0.23 7.87 7.87 0.077 625.07 0.05 0.05
0.25 9.79 9.79 0.095 625.38 0.06 0.06
0.28 11.71 11.71 0.117 625.76 0.06 0.06
0.30 13.63 13.63 0.143 626.21 0.07 0.07
' 0.33 12.34 12.34 0.170 626.66 0.08 0.08
0.35 11.06 11.06 0.193 627.07 0.31 0.31
0.38 9.77 9.77 0.213 627.40 1.50 1.50
' 0.40 8.48 8.48 0.228 627.66 2.14 2.14
0.43 7.49 7.49 0.240 627.86 2.44 2.44
0.45 6.49 6.49 0.249 628.02 2.65 2.65
' 0.48 5.49 5.49 0.256 628.14 2.79 2.79
0.50 4.50 4.50 0.260 628.21 2.88 2.88
0.53 4.27 4.27 0.263 628.26 2.94 2.94
' 0.55 4.03 4.03 0.266 628.31 2.99 2.99
0.58 3.80 3.80 0.268 628.34 3.02 3.02
0.60 3.57 3.57 0.269 628.36 3.05 3.05
' 0.63 3.30 3.30 0.270 628.38 3.06 3.
0.65 3.03 3.03 0= 0 Z8,3
3.07
3.07

' 0.68
0.70 2.75
2.48 2.75
2.48 0.270
0.269 628.37
628.36 3.06
3.04 3.06
3.04
0.73 2.40 2.40 0.268 628.34 3.02 3.02

' 0.75
0.78 2.31
2.23 2.31
2.23 0.266
0.265 628.31
628.29 2.99
2.97 2.99
2.97
0.80 2.14 2.14 0.263 628.26 2.94 2.94
0.83 2.07 2.07 0.262 628.23 2.90 2.90
' 0.85 2.01 2.01 0.260 628.20 2.87 2.87
0.88 1.94 1.94 0.258 628.17 2.83 2.83
' 0.90 1.88 1.88 0.256 628.14 2.79 2.79
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.93 1.82 1.82 0.254 628.11 2.75 2.75
0.95 1.77 1.77 0.252 628.07 2.71 2.71
0.98 1.72 1.72 0.250 628.04 2.67 2.67
' 1.00 1.67 1.67 0.248 628.01 2.63 2.63
1.03 1.63 1.63 0.246 627.97 2.59 2.59
1.05 1.58 1.58 0.244 627.94 2.54 2.54
' 1.08 1.54 1.54 0.242 627.91 2.49 2.49
1.10 1.50 1.50 0.240 627.87 2.45 2.45
1.13 1.46 1.46 0.238 627.84 2.40 2.40
' 1.15 1.43 1.43 0.237 627.81 2.36 2.36
1.18 1.39 1.39 0.235 627.77 2.31 2.31
1.20 1.36 1.36 0.233 627.74 2.27 2.27
' 1.23 1.33 1.33 0.231 627.71 2.22 2.22
1.25 1.30 1.30 0.229 627.68 2.17 2.17
1.28 1.27 1.27 0.227 627.65 2.12 2.12
' 1.30 1.24 1.24 0.226 627.62 2.07 2.07
1.33 1.22 1.22 0.224 627.59 2.02 2.02
1.35 1.19 1.19 0.222 627.56 1.98 1.98
' 1.38 1.17 1.17 0.221 627.53 1.93 1.93
1.40 1.15 1.15 0.219 627.51 1.89 1.89
1.43 1.12 1.12 0.218 627.48 1.81 1.81
' 1.45 1.10 1.10 0.216 627.46 1.72 1.72
1.48 1.08 1.08 0.215 627.44 1.64 1.64
1.50 1.06 1.06 0.214 627.42 1.56 1.56
1.53 1.04 1.04 0.213 627.40 1.50 1.50
1.55 1.02 1.02 0.212 627.39 1.44 1.44
1.58 1.01 1.01 0.211 627.37 1.38 1.38
1.60 0.99 0.99 0.211 627.36 1.33 1.33
1.63 0.97 0.97 0.210 627.35 1.29 1.29
1.65 0.96 0.96 0.209 627.34 1.25 1.25
' 1.68 0.94 0.94 0.209 627.33 1.21 1.21
1.70 0.92 0.92 0.208 627.32 1.17 1.17
1.73 0.91 0.91 0.208 627.31 1.14 1.14
' 1.75 0.90 0.90 0.207 627.30 1.11 1.11
1.78 0.88 0.88 0.207 627.30 1.08 1.08
1.80 0.87 0.87 0.206 627.29 1.05 1
05
' 1.83 0.86 0.86 0.206 627.28 1.03 .
1.03
1.85 0.84 0.84 0.206 627.28 1.01 1.01

' 1.88
1.90 0.83
0.82 0.83
0.82 0.205
0.205 627.27
627.27 0.98
0.96 0.98
0.96
1.93 0.81 0.81 0.205 627.26 0.94 0.94
' 1.95
1.98 0.80
0.78 0.80
0.78 0.204
0.204 627.26
627.25 0.93
0.91 0.93
0.91
2.00 0.77 0.77 0.204 627.25 0.89 0.89

' 2.03
2.05 0.76
0.75 0.76
0.75 0.204
0.203 627.24
627.24 0.88
0.87 0.88
0.87
2.08 0.74 0.74 0.203 627.24 0.85 0.85
' 2.10 0.73 0.73 0.203 627.23 0.84 0.84

Event HYdrograPh Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
2.13 0.72 0.72 0.203 627.23 0.83 0.83
2.15 0.72 0.72 0.203 627.22 0.82 0.82
2.18 0.71 0.71 0.202 627.22 0.81 0.81
2.20 0.70 0.70 0.202 627.22 0.79 0
79
2.23 0.69 0.69 0.202 627.21 0.78 .
0.78
2.25 0.68 0.68 0.202 627.21 0.77 0.77
2.28
2.30 0.67
0.67 0.67
0.67 0.202
0.201 627.21
627.20 0.76
0.75 0.76
0.75
2.33 0.66 0.66 0.201 627.20 0.74 0.74
2.35
2.38 0.65
0.64 0.65
0.64 0.201
0.201 627.20
627.20 0.73
0.72 0.73
0.72
2.40 0.64 0.64 0.201 627.19 0.71 0.71
2.43
2.45 0.63
0.62 0.63
0.62 0.201
0.200 627.19
627.19 0.71
0.70 0.71
0.70
2.48 0.62 0.62 0.200 627.19 0.69 0.69

i 2.50 0.61 0.61 0.200 627.18 0.68 0.68

I Total Routing Mass Balance Discrepancy is 0.01%

L
u
0

u

3plaU -= i -eo?.a
Modified Puls Routing F071) V- E - 5o ?. ?
Inflow Hydrograph: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FUT-50.HYD
' Storage/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-14STORMW-I\DPM-CA-I\DESIGN\FINALFUT.E,
' Basin Bypass Capacity = 0.0 cfs
Starting Pool Elevation = 624.00 feet
Time Interval =.025 hours
t
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
' (hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.00 0.00 0.00 0.014 624.00 0.00 0.00
0.03 1.27 1.27 0.015 624.02 0.00 0.00
0.05 2.54 2.54 0.019 624.09 0.01 0.01
0.08 3.81 3.81 0.026 624.20 0.02 0.02
' 0.10 5.08 5.08 0.035 624.36 0.03 0.03
0.13 6.09 6.09 0.046 624.55 0.03 0.03
0.15 7.10 7.10 0.060 624.79 0.04 0.04
' 0.18 8.11 8.11 0.076 625.05 0.05 0.05
0.20 9.13 9.13 0.093 625.35 0.06 0.06
0.23 11.47 11.47 0.114 625.72 0.06 0.06
' 0.25 13.80 13.80 0.140 626.16 0.07 0.07
0.28 16.14 16.14 0.171 626.69 0.08 0.08
0.30 18.48 18.48 0.206 627.28 1.01 1
01
0.33 16.94 16.94 0.239 627.84 2.41 .
2.41
0.35 15.40 15.40 0.267 628.32 _ 3.00 3.00 N 5 c Fs 8isc-11"e
0.38 13.85 13.85 0.287 628.66 6.97 6.97 ?n 0-11;M P• Fr
0.40 12.31 12.31 0.295 628.80 11.23 11.23
v,. _.....
- 7usT 6CF0a,1;
UIJAM ?4GTi wa VD
SP
*4 Ac "*T
5
0.43 11.04 11.04 0.295 628.81 11.61 11 1.61 I
0
' 0.45
0.48 9.76
8.49 9.76
8.49 0.294
0.292 628.79
628.76 10.58
9.34 10.58
9.34
0.50 7.22 7.22 0.290 628.72 8.39 8.39
' 0.53
0.55 6.90
6.59 6.90
6.59 0.288
0.287 628.69
628.67 7.61
7.10 7.61
7.10
0.58 6.28 6.28 0.286 628.65 6.71 6.71
' 0.60
0.63 5.96
5.58 5.96
5.58 0.285
0.284 628.63
628.62 6.36
6.02 6.36
6.02
0.65 5.19 5.19 0.283 628.60 5.65 5.65
' 0.68
0.70 4.81
4.42 4.81
4.42 0.282
0.281 628.59
628.57 5.27
4.88 5.27
4.88
0.73 4.30 4.30 0.281 628.56 4.58 4.58
' 0.75
0.78 4.17
4.05 4.17
4.05 0.280
0.280 628.55
628.54 4.38
4.22 4.38
4.22
0.80 3.92 3.92 0.279 628.54 4.08 4.08
0.83 3.82 3.82 0.279 628.53 3.96 3.96
' 0.85 3.72 3.72 0.279 628.53 3.85 3.85
0.88 3.62 3.62 0.279 628.52 3.75 3.75
' 0.90 3.53 3.53 0.278 628.52 3.65 3.65

Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.93 3.45 3.45 0.278 628.52 3.55 3.55
' 0.95 3.36 3.36 0.278 628.51 3.47 3.47
0.98 3.28 3.28 0.278 628.51 3.38 3.38
' 1.00 3.20 3.20 0.277 628.50 3.30 3.30
1.03 3.14 3.14 0.277 628.50 3.23 3.23
1.05 3.07 3.07 0.277 628.50 3.20 3.20
' 1.08 3.01 3.01 0.277 628.49 3.19 3.19
1.10 2.94 2.94 0.276 628.48 3.18 3.18
1.13 2.88 2.88 0.276 628.48 3.17 3.17
' 1.15 2.83 2.83 0.275 628.46 3.16 3.16
1.18 2.77 2.77 0.274 628.45 3.15 3.15
1.20 2.72 2.72 0.274 628.44 3.13 3.13
' 1.23 2.67 2.67 0.273 628.42 3.11 3.11
1.25 2.62 2.62 0.272 628.41 3.10 3.10
1.28 2.58 2.58 0.271 628.39 3.08 3.08
1.30 2.53 2.53 0.270 628.37 3.06 3.06
1.33 2.49 2.49 0.269 628.35 3.04 3.04
1.35 2.45 2.45 0.267 628.33 3.02 3.02
' 1.38 2.41 2.41 0.266 628.31 2.99 2.99
1.40 2.37 2.37 0.265 628.29 2.97 2.97
1.43 2.33 2.33 0.264 628.27 2.95 2.95
1.45 2.30 2.30 0.262 628.25 2.92 2.92
1.48 2.26 2.26 0.261 628.23 2.90 2.90
1.50 2.23 2.23 0.260 628.20 2.87 2.87
' 1.53 2.19 2.19 0.259 628.18 2.84 2.84
1.55 2.16 2.16 0.257 628.16 2.81 2.81
1.58 2.13 2.13 0.256 628.13 2.79 2.79
' 1.60 2.10 2.10 0.254 628.11 2.76 2.76
1.63 2.07 2.07 0.253 628.09 2.73 2.73
1.65 2.05 2.05 0.252 628.06 2.70 2.70
' 1.68 2.02 2.02 0.250 628.04 2.67 2.67
1.70 1.99 1.99 0.249 628.02 2.65 2.65
1.73 1.97 1.97 0.248 628.00 2.62 2.62
' 1.75 1.94 1.94 0.246 627.97 2.59 2.59
1.78 1.92 1.92 0.245 627.95 2.56 2.56
1.80 1.89 1.89 0.244 627.93 2.53 2.53
1.83 1.87 1.87 0.242 627.91 2.49 2.49
1.85 1.85 1.85 0.241 627.88 2.46 2.46

' 1.88
1.90 1.83
1.81 1.83
1.81 0.240
0.239 627.86
627.84 2.44
2.41 2.44
2.41
1.93 1.79 1.79 0.237 627.82 2.38 2.38

' 1.95
1.98 1.77
1.75 1.77
1.75 0.236
0.235 627.80
627.78 2.35
2.32 2.35
2.32
2.00 1.73 1.73 0.234 627.76 2.29 2.29
' 2.03
2.05 1.71
1.69 1.71
1.69 0.233
0.232 627.74
627.72 2.26
2.23 2.26
2.23
2.08 1.67 1.67 0.230 627.70 2.20 2.20
2.10 1.66 1.66 0.229 627.68 2.17 2.17
i?
.J
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
' (hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
2.13 1.64 1.64 0.228 627.66 2.14 2.14
' 2.15 1.62 1.62 0.227 627.65 2.11 2.11
2.18 1.61 1.61 0.226 627.63 2.09 2.09
2.20 1.59 1.59 0.225 627.61 2.06 2.06
' 2.23 1.57 1.57 0.224 627.60 2.03 2.03
2.25 1.56 1.56 0.223 627.58 2.01 2.01
' 2.28 1.54 1.54 0.222 627.56 1.98 1.98
2.30 1.53 1.53 0.222 627.55 1.96 1.96
2.33 1.52 1.52 0.221 627.53 1.93 1.93
2.35 1.50 1.50 0.220 627.52 1.91 1.91
2.38 1 A9 1.49 0.219 627.51 1.89 1.89
2.40 1.47 1.47 0.218 627.49 1.85 1:85
' 2.43 1.46 1.46 0.218 627.48 1.80 1.80
2.45 1.45 1.45 0.217 627.47 1.75 1.75
2.48 1.44 1.44 0.216 627.46 1.71 1.71
' 2.50 1.42 1.42 0.216 627.45 1.68 1.68
Total Routing Mass Balance Discrepancy is 0.03%

r

0

7

Modified Puls Routing
36 t UD -I --DI)?)
Dem AJ C-
RurUg-eT to i4
Inflow Hydrograph: G:\PROJECTS\30140E--1\STORMW-I\DPM-CA-I\DESIGN\FUT-100.HYD
' Storage/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-1\DPM-CA--I\DESIGN\FINALFUT.E,
Basin Bypass Capacity = 0.0 cfs
Starting Pool Elevation = 624.00 feet
Time Interval =.025 hours

7

Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs) .
0.00 0.00 0.00 0.014 624.00 0.00 0.00
0.03 1.49 1.49 0.016 624.03 0.00 0.00
0.05 2.98 2.98 0.020 624.11 0.01 0.01
0.08 4.47 4.47 0.028 624.24 0.02 0.02
0.10 5.96 5.96 0.039 624.42 0.03 0.03
0.13 7.07 7.07 0.052 624.65 0.04 0.04
0.15 8.17 8.17 0.068 624.92 0.04 0.04
0.18 9.27 9.27 0.086 625.22 0.05 0.05
0.20 10.37 10.37 0.106 625.57 0.06 0.06
0.23 12.85 12.85 0.130 625.98 0.07 0.07
0.25 15.33 15.33 0.159 626.47 0.07 0.07
0.28 17.81 17.81 0.192 627.05 0.25 0.25
0.30 20.28 20.28 0.229 627.68 2.17 2.17
0.33 18.66 18.66 0.264 628.28 2.96 2.96
0.35 17.03 17.03 0.290 628.71 8.17 8.17
0.38 15.40 15.40 0.300 628.88 14.62 14.62
0.40 13.78 13.78 0.300 628.88 14.59 14.59
0.43 12.41 12.41 0.298 628.85 13.31 13.31
0.45 11.04 11.04 0.296 628.82 11.96 11.96
0.48 9.68 9.68 0.294 628.79 10.60 10.60
0.50 8.31 8.31 0.292 628.75 9.23 9.23
0.53 7.97 7.97 0.291 628.73 8.54 8.54
0.55 7.62 7.62 0.289 628.71 8.10 8.10
0.58 7.28 7.28 0.288 628.69 7.72 7.72
0.60 6.94 6.94 0.288 628.68 7.36 7.36
0.63 6.51 6.51 0.287 628.66 6.99 6.99
0.65 6.09 6.09 0.286 628.64 6.58 6.58
0.68 5.66 5.66 0.285 628.63 6.17 6.17
0.70 5.24 5.24 0.284 628.61 5.75 5.75
0.73 5.10 5.10 0.283 628.59 5.41 5.41
0.75 4.96 4.96 0.282 628.58 5.18 5.18
0.78 4.82 4.82 0.282 628.58 5.01 5.01
0.80 4.68 4.68 0.281 628.57 4.86 4.86
0.83 4.57 4.57 0.281 628.56 4.72 4.72
0.85 4.45 4.45 0.281 628.56 4.60 4.60
0.88 4.34 4.34 0.280 628.55 4.48 4.48
0.90 4.23 4.23 0.280 628.55 4.37 4.37
Event Hydrograph Basin Storage Elevation Basin Outflow
' Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.93 4.14 4.14 0.280 628.55 4.26 4.26
0.95 4.05 4.05 0.280 628.54 4.16 4.16
0.98 3.96 3.96 0.279 628.54 4.07 4.07
' 1.00 3.87 3.87 0.279 628.53 3.98 3.98
1.03 3.79 3.79 0.279 628.53 3.89 3.89
1.05 3.72 3.72 0.279 628.53 3.81 3.81
1.08 3.64 3.64 0.279 628.52 3.74 3.74
1.10 3.57 3.57 0.278 628.52 3.66 3.66
1.13
1.15 3.50
3.44 3.50
3.44 0.278
0.278 628.52
628.51 3.59
3.52 3.59
3.52
1.18 3.38 3.38 0.278 628.51 3.46 3.46
' 1.20
1.23 3.31
3.26 3.31
3.26 0.278
0.278 628.51
628.51 3.39
3.33 3.39
3.33
1.25 3.21 3.21 0.277 628.50 3.27 3.27
1.28
1.30 3.15
3.10 3.15
3.10 0.277
0.277 628.50
628.50 3.22
3.20 3.22
3.20
1.33 3.05 3.05 0.277 628.49 3.19 3.19
' 1.35
1.38 3.00
2.96 3.00
2.96 0.277
0.276 628.49
628.48 3.18
3.18 3.18
3.18.
1.40 2.91 2.91 0.276 628.47 3.17 3.17
1.43
1.45 2.87
2.83 2.87
2.83 0.275
0.274 628.46
628.45 3.16
3.15 3.16
3.15
1.48 2.79 2.79 0.274 628.44 3.13 3.13
1.50 2.75 2.75 0.273 628.43 3.12 3.12
1.53 2.71 2.71 0.272 628.41 3.10 3.10
1.55 2.67 2.67 0.271 628.40 3.09 3.09
1.58 2.64 2.64 0.270 628.39 3.07 3.07
' 1.60 2.60 2.60 0.270 628.37 3.06 3.06
1.63 2.57 2.57 0.269 628.35 3.04 3.04
1.65 2.54 2.54 0.268 628.34 3.02 3.02
1.68 2.51 2.51 0.267 628.32 3.00 3.00
1.70 2.47 2.47 0.266 628.30 2.98 2.98
1.73 2.45 2.45 0.265 628.28 2.96 2.96
' 1.75 2.42 2.42 0.263 628.27 2.94 2.94
1.78 2.39 2.39 0.262 628.25 2.92 2.92
1.80 2.36 2.36 0.261 628.23 2.90 2.90
1.83 2.33 2.33 0.260 628.21 2.88 2.88.
1.85 2.31 2.31 0.259 628.19 2.85 2.85
1.88 2.28 2.28 0.258 628.17 2.83 2.83
1.90 2.26 2.26 0.257 628.15 2.81 2.81
1.93 2.23 2.23 0.256 628.13 2.78 2.78
' 1.95 2.21 2.21 0.255 628.11 2.76 2.76
1.98 2.19 2.19 0.253 628.09 2.74 2.74
2.00 2.16 2.16 0.252 628.07 2.71 2.71
' 2.03 2.14 2.14 0.251 628.05 2.69 2.69
2.05 2.12 2.12 0.250 628.03 2.67 2.67
2.08 2.10 2.10 0.249 628.02 2.64 2.64
2.10 2.08 2.08 0.248 628.00 2.62 2.62

Event
Time
(hours) Hydrograph
Inflow
(cfs) Basin
Inflow
(cfs) Storage
Used
(acre-ft) Elevation Basin
Above MSL Outflow
(feet) (cfs) Outflow
Total
(cfs)
2.13 2.06 2.06 0.247 627.98 2.59 2.59
2.15 2.04 2.04 0.246 627.96 2.57 2.57
2.18 2.02 2.02 0.244 627.94 2.54 2.54
2.20 2.00 2.00 0.243 627.92 2.52 2.52
2.23 1.98 1.98 0.242 627.90 2.49 2.49
2.25 1.97 1.97 0.241 627.89 2.47 2.47
2.28 1.95 1.95 0.240 627.87 2.44 2.44
2.30 1.93 1.93 0.239 627.85 2.42 2.42
2.33 1.91 1.91 0.238 627.83 2.40 2.40
2.35 1.90 1.90 0.237 627.82 2.37 2.37
2.38 1.88 1.88 0.236 627.80 2.35 2.35
2.40 1.87 1.87 0.235 627.78 2.33 2.33
2.43 1.85 1.85 0.234 627.77 2.31 2.31
2.45 1.84 1.84 0.233 627.75 2.28 2.28
2.48 1.82 1.82 0.233 627.74 2.26 2.26
2.50 1.81 1.81 0.232 627.72 2.23 2.23
Total Routing Mass Balance Discrepancy is 0.04%
r
i
i
.
12?zfd?
Rational Formula Hydrograph 7UTO P, t'77
M (?
Yarnell Rainfall Intensity Values Z
2 Year,1 Hour Rainfall: 1.45 inches at Future Development
Time of Concentration: 6 min.
Drainage Area: 2.900 acres.
Weighted 'C' Factor: 0.690
Rainfall Rainfall
Time Incr. Total Intensity Flow
(min) (inches) (inches) (in/hr) (cfs)
0 0.00 0:00 0.00 0.00
6 0.08 0.08 0.77 1.54
12 0.18 0.26 1.83 3.67
18 0.49 0.75 4.88 9.76
24 0.28 1.03 2.80 5.60
30 0.13 1.16 1.30 2.61
36 0.10 1.26 0.98 1.96
42 0.06 1.32 0.62 1.24
48 0.05 1.37 0.51 1.03
54 0.04 1.41 0.43 , 0.87
60 0.04 1.45 0.37 0.74
At time = 150 minutes, the flow is 0.19 CFS.

Rational Formula Hydrograph , 1
Yarnell Rainfall Intensity Values FUT L) Y2-c - 10 yl?
10 Year,1 Hour Rainfall: 2.36 inches at Future Development
Time of Concentration: 6 min.
Drainage Area: 2.900 acres.
Weighted 'C' Factor: 0.690
Rainfall Rainfall
Time Incr. Total Intensity Flow
(min) (inches) (inches) (in/hr) (cis)
0 0.00 0.00 0.00 0.00
6 0.15 0.15 1.47 2.94
12 0.30 0.44 2.98 5.95
18 0.68 1.13 6.81 13.63
24 0.42 1.55 4.24 8.48
30 0.22 1.77 2.25 4.50
36 0.18 1.95 1.78 3.57
42 0.12 2.08 1.24 2.48
48 0.11 2.18 1.07 2.14
54 0.09 2.28 0.94 1.88
60 0.08 2.36 0.83 1.67
At time = 150 minutes, the flow is 0.61 CFS.

Rational Formula Hydrograph
Yarnell Rainfall Intensity Values
50 Year, I Hour Rainfall: 3.66 inches at Future Development
Time of Concentration: 6 min.
Drainage Area: 2.900 acres.
Weighted 'C' Factor: 0.690
31zI b1 ?(C
45D yK
Rainfall Rainfall
Time Incr. Total Intensity Flow
(min) (inches) (inches) (in/hr) (cfs)
0 0.00 0.00 0.00 0.00
6 0.25 0.25 2.54 5.08
12 0.46 0.71 4.56 9.13
18 0.92 1.63 9.24 18.48
24 0.62 2.25 6.15 12.31
30 0.36 2.61 3.61 7.22
36 0.30 2.91 2.98 5.96
42 0.22 3.13 2.21 4.42
48 0.20 3.32 1.96 3.92
54 0.18 3.50 1.76 3.53
60 0.16 3.66 1.60 3.20
At time = 150 minutes, the flow is 1.42 CFS.
LAwGiBB
GROL7P
f4
`l
MAR
March 1, 2001 .n?'!
Mr. Todd St. John
N.C. DENR Division of Water Quality, Wetlands Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604-2260
RE: DPM of the Carolinas, HWY 29/601
401 Water Quality Certification Requirements
Cabarrus County
DWQ # 000034
LAW Project 30100-1-0020
Dear Mr. St. John:
Transmitted herewith is an executed Maintenance Agreement for the structural BMP's proposed
for the DPM project site at 371 Concord Parkway in Concord, North Carolina. This Agreement is
a supplement to the Stormwater Management Plan that was submitted to you on February 27,
2001.
If you need additional information or have any questions, please do not hesitate to call us at (704)
357-8600.
Sincerely,
LAW NGINE;FI: G A ENVIRONMENTAL SERVICES, INC. k??
illiam C. Pruit, Scott . Stone, P.E.
Senior Engineer Managing Principal
cc: Mr. Bo Dickens
Attachments
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 • Charlotte NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area for over 50 years
G',Projects\.30140 fimvironmemal\Stomiwater\DPM-Carolinas\repons\dwgwgmtnce_lt .doc
ice=
Division of Water Quality (DWQ) of any problems with the system, or prior to any
changes to the system or responsible party.
Print name:
Title: -Mwv'1,Vi4 V wwu- ' /? L-?
Address: VO ? P I pjl, W w-3 Nt' M 2?'-
Phone: -10 - 7? ? - ?43 4-
Signature:
Date:
I, L. O 0. C. & a & J' , a Notary Public for the State of
r 6tt County of `.LA ar 0' ? S do hereby
certify that ?. ;c??v15 Sr. personally appeared before me this
S day of ilY?t , j, and acknowledged the due execution of the
foregoing extended dry detention basin and grassed swale maintenance requirements.
Witness my hand and official seal,
My commission expires ? - Z -0'3
Page 3 of3
J:\Projects\30140 Environmental\Stormwater\DPM-Carolinas\reports\bmpmtnceagree.doc
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State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
Maintenance Agreement for
Stormwater Management Structural BMP's
DPM of the Carolinas, HWY 29/601 Site, Cabarrus County
The stormwater management structural BMP's at the DPM of the Carolinas, HWY 29/601 Site, in
Concord, N.C. consist of an Extended Dry Detention Basin and a Grassed Swale.
Site drainage and BMP conditions will be monitored on an ongoing basis by regular field
inspections. Erosion will be repaired and stabilized. Excessive sediment buildup in the facilities
will be removed and disposed of properly, as will trash and debris accumulations in the facilities.
The improvements will be kept in good condition to ensure that they continue to function in their
intended manner.
Specific Extended Dry Detention Basin maintenance activities shall be performed as
follows:
1. After every significant runoff producing rainfall event and at least monthly:
• Inspect the basin for erosion, problems on the banks and berm, erosion at the inlet
and outlet, sediment accumulation, condition of the emergency spillway, clogging of
the outlet, woody vegetation in the embankment, and general condition.
• Check and clear the orifice of any obstructions such that draw down of the temporary
pool occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of 12 inches, and remove trash as needed.
3. Remove accumulated sediment for the basin semi-annually or when depth is reduced to 75% of
the original design depth. Removed sediment shall be disposed of in an appropriate a manner and
Page 1 of 3
JAProjects\30140 Environmental\Stormwater\DPM-Caro linas\repons\bmpmtnceagree.doc
0- k
shall be handled in a manner that will not adversely impact water quality (i.e., stockpiling near a
stream).
4. All components of the dry detention basin system shall be maintained in good working
order.
Specific Grassed Swale maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
• Inspect the swale and the associated piping for erosion, bare spots, erosion at the inlet
and outlet, sediment accumulation, clogging of the outlet, and general condition.
• Check and clear the outlet pipe of any obstructions that prevent it from functioning as
designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover,
mow vegetative cover to maintain a maximum height of 6 inches, and remove trash as needed.
3. Excess sediment shall be removed as necessary, but at least once annually, with the original
contours and grading restored annually to ensure that flow in the swale is evenly distributed
across the bottom. Removed sediment shall be disposed of in an appropriate manner and shall be
handled in a manner that will not adversely impact water quality (i.e., stockpiling near a stream).
4. The swale will be mowed regularly throughout the growing season, and as necessary during
other periods, to a maximum height of six inches.
5. All components of the grassed swale system shall be maintained in good working
order.
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 N.C. D.E.N.R.
Page 2 of 3
JAProjects\30140 Environmental\Stormwater\DPM-Carolinas\reports\bmpmtnceagree.doc

Rational Formula Hydrograph ®` M"c
-
Yarnell Rainfall Intensity Values F(OD 06 Q&
100 Year, I Hour Rainfall: 4.18 inches at Future Development
Time of Concentration: 6 min.
Drainage Area: 2.900 acres.
Weighted 'C' Factor: 0.690
Rainfall Rainfall
Time Incr. Total Intensity Flow
(min) (inches) (inches) (in/hr) (cfs)
0 0.00 0.00 0.00 0.00
6 0.30 0.30 2.98 5.96
12 0.52 0.82 5.18 10.37
18 1.01 1.83 10.14 20.28
24 0.69 2.52 6.88 13.78
30 0.42 2.93 4.15 8.31
36 0.35 3.28 3.47 6.94
42 0.26 3.54 2.62 5.24
48 0.23 3.78 2.34 4.68
54 0.21 3.99 2.11 4.23
60 0.19 4.18 1.93 3.87
At time = 150 minutes, the flow is 1.81 CFS.
i
1
FUTUeF C (\)I) i °I oN S
SCS Segmental Travel Time DP"
D1AIN4f A 3010Q
Summary for Future Conditions - PIZIM
---- S46ET 2-0f 2
Segment 1: Overland Flow
L =100 ft, S = .005 ft/ft, n = .011, P(2yr/24hr) = 3.12 in
Travel Time = 2.1 minutes
Segment 2: Concentrated Flow
L = 350 ft, S = .02 ft/ft, Paved surface
Travel Time = 2 minutes
Segment 3: Concentrated Flow
L = 250 ft, S = .02 ft/ft, Unpaved surface
Travel Time =1.8 minutes
Total Travel Time = 5.99 Minutes
s
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2001
LAWGIMBB
Gxour
REPORT OF
STORINIWATER MANAGEMENT PLAN
DPM OF THE CAROLINAS
CONCORD, NORTH CAROLINA
Prepared For:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND
NATURAL RESOURCES
2321 Crabtree Boulevard, Suit- 250
Raleigh, North Carolina
Prepared By:
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina
February 22, 2001
LAW Project 30100-1-0020
?ZU? I
f
LAwGiBB `
GROUP
February 19, 2001
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. John R. Dorney
Non-discharge Branch/Wetlands/401 Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
1,4812 '9 zoo,
z _ FF
Subject: Approval of Payment into the NC Wetlands Restoration Program
DPM of the Carolinas
After-the-Fact Permit
U.S. Highway 29/601 Office Building Site
DWQ Project No. 000034
Cabarrus County, North Carolina
LAW Project 30100-9-4882
Dear Mr. Dorney:
As you are aware, Law Engineering and Environmental Services, Inc. (LAW) is the authorized
agent for DPM of the Carolinas with respect to the Section 404 Wetlands Permit and Section 401
Water Quality Certification in the above-referenced matter. Your written correspondence dated
April 6, 2000 revealed that proposed on-site stream mitigation did not meet stream restoration as
defined in North Carolina Water Quality General Certification #3257 and that other forms of
mitigation, such as payment to the Wetlands Restoration Program, must be arranged in order to
provide a complete Water Quality Certification application.
LAW is submitting this letter to inform you that the North Carolina Wetlands Restoration Program
(WRP) will accept payment for the relocation of approximately 270 linear feet of stream channel
associated with the U.S. Highway 29/601 Office Building project located in Cabarrus County,
North Carolina (see attached letter). Subsequently, DPM has elected to pay into the NC Wetlands
Restoration Fund (WRF) as compensation for the above-mentioned stream impacts. LAW's storm
water engineers recently discussed the requirements associated with storm-water management on
the subject property. It is anticipated that the requisite storm-water management plan will be
forwarded to Todd St. John by February 21, 2001.
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 - Charlotte, NC 28208
704-357-8600 - Fax: [phone]
Serving the Charlotte area for over 50 years
s . ,
Mr. John Dorney
February 19, 2001
Page 2
Your assistance and continued processing of the subject water quality certification is appreciated.
LAW would appreciate your written concurrence with regards to payment into the WRF for
impacts associated with the U.S. Highway 29/601 Building project. If you have any questions or
comments, please contact me at [phone] extension 5543, or at [e-mail].
Sincerely,
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
Michael A. I g cco Richard B. Darling, C.E.
Senior Envir nmental Scientist Principal
Environmental Scientist
MAI/RBD: jet
cc: Mr. Todd St. John, Division of Water Quality
Mr. Todd Dickens, DPM of the Carolinas
Mr. Samar Bou-Ghazale, Mooresville Regional Office
Mr. Ronald E. Ferrell, WRP

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LAwGiBB
GROUP
February 22, 2001
Mr. Todd St. John
N.C. DENR Division of Water Quality, Wetlands Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604-2260
RE: DPM of the Carolinas, HWY 29/601
Report of Stormwater Management
401 Water Quality Certification Requirements
Cabarrus County, North Carolina
DWQ # 000034
LAW Project No. 30100-1-0020
Dear Mr. St. John:
' On behalf of Mr. Bo Dickens and DPM of the Carolinas (DPM), we are pleased to submit to you,
this proposed Stormwater Management Plan to address the 401 Water Quality Certification
requirements for the DPM project site at 371 Concord Parkway in Concord, North Carolina.

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The proposed Plan includes a Grassed Swale BMP and an Extended Dry Detention Basin BMP,
both of which are defined in the "NC DENR Stormwater Best Management Practices Manual -
April 1999 (BMP Manual). The plan also includes other incidental site modifications to
supplement stormwater management for the site. Details of the plan are included in the attached
report.
It is our opinion that the proposed plan satisfies the necessary stormwater management plan
requirements for 401 Water Quality Certification for the DPM site. Your review and approval of
this proposed plan would be appreciated.
If you need additional information or have any questions, please do not hesitate to call us at (704)
357-8600.
Sincerely,
Yfia/mjC. GINEERING AND
Prui tt, P.E.
Senior Engineer
cc: Mr. Bo Dickens
Attachments
ONMENTAL SERVICES, INC.
Scott D. Stone
Managing Principal
Assisting Vice President
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 v Charlotte, NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area for over 50 years

DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
TABLE OF CONTENTS
COVER LETTER ............................................................................................ii
1. PROJECT BACKGROUND .................................................................................................1-1
2. SITE DESCRIPTION ............................................................................................................2-1
3. PROPOSED STORMWATER MANAGEMENT PLAN .....................................................3-1
4. STORMWATER MANAGEMENT PLAN DESIGN ..........................................................4-1
4.1 EXTENDED DRY DETENTION BASIN .....................................................................4-2
4.2 GRASSED SWALE .......................................................................................................4-4
4.2 MODIFICATIONS TO EXISTING STORMWATER DEVICES ................................4-5
4.3 OTHER DRAINAGE MODIFICATIONS ....................................................................4-5
5. EROSION AND SEDIMENT CONTROL DURING CONSTRUCTION ...........................5-1
6. LONG TERM MAINTENANCE OF BMP'S .......................................................................6-1
LIST OF TABLES
Table 1 Site Hydrologic Conditions
LIST OF FIGURES
Figure 1 Site Plan and Drainage Areas
Figure 2 Proposed Stormwater Management Plan BMP's
Figure 3 Section A-A Extended Dry Detention Basin
Figure 4 Section B-B Extended Dry Detention Basin
Figure 5 Section C-C Extended Dry Detention Basin
Figure 6 Profile of Grassed Swale and Outlet Pipe
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DPM of the Carolinas- Report of Stormwater Management
LAW Project No. 30100-1-0020
APPENDICES
Appendix I Site Runoff Calculations
Appendix 2 Detention Basin Volume Calculations
Appendix 3 Water Surface Elevation's in Un-named Tributary
Appendix 4 Detention Basin Routing Calculations
Appendix 5 Grassed Swale Calculations
iii
February 22, 2001
' DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
1 PROJECT BACKGROUND
DPM conducted site modification (grading) activities to support commercial development on its
' property at 371 Concord Parkway in Concord, North Carolina. Site modifications consisted of
fill to level the site to suitable grades, and the unauthorized relocation of approximately 300 linear
' feet of jurisdictional stream. Subsequent to the submittal of an After-the-Fact Permit application,
the US Army Corps of Engineers (USACE) issued a Section 404 Nationwide Permit 26 (Action
' I.D. 200030391) / N.C D.E.N.R. Division of Water Quality (DWQ). One of the requirements of
the corresponding Section 401 Water Quality Certification is the development and
' implementation of a stormwater management plan that includes BMP's designed to remove 85%
of Total Suspended Solids (85% TSS). Representatives from DWQ visited the site subsequent to
substantial completion of activities at the site and determined that stormwater management
' devices that had been constructed for the site did not meet these requirements. DWQ advised
DPM that these deficiencies would have to be addressed before a 401 Water Quality Certification
' could be issued. DPM in turn, retained Law Engineering and Environmental Services (LAW) to
assist it in developing a plan to meet DWQ's 401 Water Quality Certification requirements.

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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
2 SITE DESCRIPTION
The DPM site at 371 Concord Parkway is a 7-acre site, and is located on the west side of the
highway. An un-named tributary to Irish Buffalo Creek cuts across the site, and the commercial
development activity that has been accomplished is all located on the southern portion of the site.
This southern developed portion of the site is the focus of this stormwater management plan.
This portion contains approximately 4 acres, of which 0.82 acre has been converted to impervious
surface in the form of buildings, sidewalks and parking lots.
There are three outfall points for runoff from the site. For reference purposes, these outfalls have
been named as Lower, Middle and Upper Outfalls, concurrent with the slope of the receiving
creek. The Middle and Upper Outfalls receive the majority of flow from the impervious portion
of the site, and both have small detention basins intended to serve as the site's Stormwater
management.
Topography at the site reflects the fill activity to convert the original steeply sloped site to one
more suitable for commercial development. The portion of the site covered by the stormwater
management plan, generally slopes from east to west, and the slope of the developed portion
generally varies from 1 to 3 percent. Fill slopes are typically 21-1: IV.
The site, including developed areas, is shown on Figure 1.
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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
3 PROPOSED STORMWATER MANAGEMENT PLAN
A review of physical characteristics for each of the existing Stormwater management devices
confirmed that the facilities did not meet minimum design requirements for DENR's approved
BMP's. Field inspection of the devices and the site in general, as well as an evaluation of the
site's topographic and planimetric constraints, revealed that the device at the southwestern
portion of the site (upper outfall) was the only one suitable for retrofit to meet the requirements of
any BMP. Although this device is located at the upstream end of the site, there is sufficient relief
available from the improvements (fill) made at the site to accommodate this drainage scheme.
Further review of the topographic and planimetric constraints at the upper location revealed that
only an Extended Dry Detention basin could reasonably be constructed at the location. This was
largely due to the limited area available between the toe of the current fill slope and the existing
stream, and the location of a sanitary sewer and the associated easement. If designed and
constructed according to DWQ's specifications, an Extended D?tentcorrasitpfsTMS(?4
W
efficient at removing TSS from stormwater runoff. Ja left.a 35% shortfa9,Il'n'ineeting .the 85%
' TSS removal '1&gWrg eft.
' Use of a Grassed Swale BN1P1 o*nake ,up the TSS removal shortfall is the most practical
alternative. This type of 13W could be located on the upper, more level portion of..the site, and
function in series with the >?xtende? n. If designed and constructed according
to DWQ's specifications, a Grassed Swale is 35% efficient at removing TSS from stormwater
runoff, which would address the 35% TSS removal shortfall.
Further review and assessment of the stormwater management device located at the midpoint
' along the stream indicated that although after retrofit, the device would still not meet the design
criteria specified by DWQ for a specific BMP, this device could still provide some measure of
stormwater treatment. Accordingly, this element has also been included in the plan presented here
as an,Added riieasure''ofst©rmwater-management.
Implementation of the three principal elements of the proposed stormwater management plan,
' will require reconstruction of the existing upper detention basin, modification of the alignment
and lining of an existing rip-rap swale, and modification of the current drainage patterns to ensure
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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
that all i ftpemious areas drain=through the. proposed Grassed'?Swal'e"and Extended Dry Detention
B?iri .-s<?.?•
A site plan showing the proposed BMP's and incidental site modifications is included as Figure 2.
This figure shows both planimetric and topographic data for the facilities.
3-2
' DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
4 STORMWATER MANAGEMENT PLAN DESIGN
' Design criteria for elements of the stormwater management plan developed herein, come
primarily from DENR's BMP Manual. The goal of the plan is to remove 85% of the TSS carried
' in stormwater runoff from impervious surfaces constructed at the site. BMP's identified and
approved by DENR can be used alone or in combination to achieve the required pollutant
' removal efficiency. Detailed design specifications and an associated removal efficiency for each
BMP have been developed by DWQ, and have been followed in the development of this plan.
' The BMP's proposed for the site are designed for the impervious areas developed at the site and
' are designed to meet hydraulic requirements as well as non-erosively pass the 10-year storm
event. In addition, the Extended Dry Detention Basin has been designed to non-erosively pass the
50-year event.
' A review of the site drainage indicated that the roof drains from the building on site discharged to
the existing stormwater management device located midway along the creek. This plan calls for a
revision to this drainage pattern to redirect this roof runoff back to the Grassed Swale BMP. The
' remainder of the site drainage patterns for impervious areas will all flow through the two
proposed BMP's as they exist.
The areas draining to each of the site's three outfalls were delineated using available site
' planimetric and topographic data, and field observations. Runoff from the areas is conveyed by
several means including sheet flow, roof drains, and drainage swales and pipes. Sub-basin
' delineations based on similar land use within each area were also determined. A total of seven
discrete sub-basins have been defined and the drainage characteristics (area, percent
' imperviousness, runoff travel path and time) for each have been computed. Table 1 provides
hydrologic details about each of the seven basins, including which outfall each area currently
' contributes to. A drainage sub-basin map for the portion of the site of interest has been developed
to compliment the Table, and is included as Figure 1.
' Stormwater discharge rates from the site for a range of event frequencies were determined using
the Rational Method. Data for each sub-basin, and cumulative sub-basins are included in Table 1.

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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
The data shown reflects the proposed modifications to the roof drainage discharge described
above. Details of the discharge calculations are included as Appendix 1.
The following paragraphs describe the details of the design for each of the proposed BMP's.
4.1 Extended Dry Detention Basin
The Extended Dry Detention Basin proposed for the site will serve as both a water quality device
and also as a peak flow control measure to meet the City of Concord's stormwater detention
requirements for the site development. Based on these two primary criteria, an initial estimate of
the volume required in the basin was determined for both the runoff from the 1-inch storm, and
for detention of the 10-year post development condition storm to maintain predevelopment runoff
rates. Additionally, a 20 percent allowance for sediment storage was added to the volume
estimate. The volumes calculated are as follows:
1 Inch Storm Runoff 3191 cu.ft. ( 0.073 acre-feet)
Sediment Accumulation 638 cu. ft. (0.015 acre-feet)
Detention Volume Estimate 7318 cu. ft. (0.168 acre-feet)
TOTAL Volume 11147 cu. ft. (0.256 acre-feet)
Details of the volume calculations are included as Appendix 2.
Using the initial estimate of volume required for the basin, along with the geometric design
requirements for the basin and site topographic constraints, a trial and error process was
undertaken to lay out a basin for the site that met all of the BMP design criteria. The proposed
basin will require reconstruction of the existing stormwater management basin, and will have
slopes of 3H:1 V. The exterior slopes of the containment berm will be at 2H:1 V, and will not
encroach on the existing creek. The bottom of the pond will be graded for positive drainage and
small earthen berms (1-1.5 feet high) will be incorporated in the bottom of the pond to ensure that
the flow path for the 1" storm inflow is at a 3:1 length to width ratio in the basin. The proposed
basin plan view is shown on Figure 2, and Figures 3, 4, and 5 present cross sectional views
through the basin.
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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
The outfall facility for the pond will consist of a conventional riser pipe outlet with trash rack,
supplemented by a rip-rap lined emergency spillway. The 8" CMP riser pipe is sized and set at an
activation elevation to pass the ten-year flow at a rate not to exceed the 10-year pre development
runoff rate. It will also include a 1-inch square orifice, which is sized to meet the release rate
requirement for the 1-inch storm. The flow through the riser pipe will be conveyed to discharge
into the creek via a 15-inch CMP, with an invert elevation at the pipe outfall of 622.5. The
emergency spillway proposed is a 15-foot wide weir set at elevation 627.0, which will allow the
routed 50-year storm event to pass with only a 0.15 foot head. Figure 5 includes a profile of the
outlet works.
The bottom of the basin as proposed is a minimum of 2.4 feet above the creek bottom. Normal
flow depth in the creek is typically less than 1 foot. Tailwater conditions in the unnamed
tributary adjacent to the proposed BMP were calculated, to ensure that the basin would function
as intended and discharge against the flow in the creek. The 2-year, 10-year, and 50-year storm
event discharges in the creek were computed to be 93, 258, and 461cfs respectively. The normal
depths of flow in the creek for these storm events were computed to be 1.5 feet, 2.6 feet, and 3.5
feet, respectively, using Manning's equation. This data translates to tailwater water surface
elevations at the outfall of 621.4, 622.5 and 623.4, respectively. Details of these calculations are
included as Appendix 3.
The 2-year, 10-year and 50-year storm events were routed through the basin to determine
maximum water surface elevations (WSEL) in the pond for each event. Details of the
computations are included in Appendix 4. The computed results are as follows:
Storm Event Maximum WSEL
2-year 625.92
10-year 626.64
50-year 627.15
The basin will be vegetated with native species that are readily available from commercial
suppilers. The bottom of the dry-basin detention pond will be seeded with at least three of the
following species: Deertongue (Dichanthelium clandestinum), Sundrops (Oenothera biennis),
Pennsylvania smartweed (Polygonum pensylvanicum), Ironweed (Vernonia noveboracensis),
River oats (Chasmanthium latifolium), and Partridge-pea (Chamaecrista fasciculata). The
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' DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
' approximate percentages of each species in the final mix will be a variation of the following rates,
which incorporates all six potential species. The final percentages will depend upon the number
' of species included. Suggested percentages are: 30 percent Deertongue, 15 percent Sundrops, 10
percent Pennsylvania smarlweed, 5 percent Ironweed, 15 percent River oats, and 25 percent
Partridge-pea. This mix should be applied at a rate of 0.05 pounds per 100 square feet (sf).
For immediate and temporary erosion control, the basin will be overseeded with 0.05 pounds per
' 100 sf of Rye-grain (Secale cereale), if initially seeded during the winter dormant season; or with
0.05 pounds per 100 sf of German millet (Setaria italica), if initially seeded during the growing
season.
' The slopes of the berm should be seeded with a 50-50 mixture of Deertongue and Switchgrass
(Panicum virgatum) at a rate of 0.75 pounds per 100 sf. Comparable species may be substituted,
depending on availability. The slopes should also be seeded with Rye-grain or German millet, as
appropriate for the season, at a rate of 1 pound per 100 sf.
'
4.2 Grassed Swale
' The Grassed Swale proposed for the site will serve to convey all runoff from impervious areas at
the site and will discharge via an 18-inch pipe to the Extended Dry Detention Basin. The swale
will run from the lower end of the existing parking lot pavement to the top of the fill slope. A
plan view of the proposed BMP is shown on Figure 2. The proposed swale will have a 10 foot
bottom width with 3:1 side slopes. Depth of the swale varies from 1 foot deep at its upper end to
two feet deep at its lower end. The longitudinal slope of the swale is 0.014. Total length of the
' Swale as proposed is. X20- fee3 which provides over twice the required length foie;0, 82_.a fe
impervious area at the site. ?.
'
The swale outlet at the top of the existing slope will include a horseshoe shaped berm as shown
' on the plan view to help prevent overflow of runoff from larger events. The swale is designed to
convey the 10-year flow with a normal depth no greater than 0.41 feet and a velocity of 2.2 feet
' per second. The 18-inch pipe that serves as an outfall from the swale into the basin will follow the
slope of fill and will be buried with 2 feet of cover. The pipe will discharge into the basin
' approximately 1 foot above the basin floor. Riprap protection will be installed at the outfall to
prevent erosion.
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DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
The swale will be seeded with a 50-50 mixture of Deertongue and Downy oat-grass (Danthonia
sericea) at a rate of 0.75 pounds per 100 square feet (sf). Comparable species may be substituted,
depending on availability. The swale should also be overseeded with Rye-grain or German
millet, as appropriate for the season, at a rate of 0.5 pound per 100 sf.
Figure 6 presents a profile of the swale and the associated 18 inch discharge pipe into the basin.
Design calculations are included for the swale design in Appendix 5.
4.3 Modifications to Existing Stormwater Devices
Review and assessment of the existing stormwater management basin located at the midpoint
along the stream indicated that even after retrofit, the device would still not meet the design
criteria specified by DWQ for any type of BMP. However, runoff from the fill slopes could be
routed through the facility to provide some measure of additional TSS removal.
The device is a small bowl shaped basin with a riprap protected weir as the only discharge
structure. A construction sediment control basin for the site was converted to create the device.
The basin is approximately 6 feet deep and its bottom is approximately 2 feet above the stream
bottom. The basin's dimensions are approximately 75 feet by 21 feet, and it has a surface area of
0.037 acre.
Proposed modifications to the basin consist of cleaning out sediment accumulations, planting
wetlands vegetation in the bottom, including necessary grading and soil preparation, and
repairs/modifications to the outlet works to allow for non-erosive discharge and also draining of
the basin.
4.4 Other Drainage Modifications
The proposed stormwater management plan requires that runoff from the roof of the new building
constructed on site be redirected to the Grassed Swale BMP. This will be necessary to have all
runoff from impervious surfaces pass through the BMP's proposed for the site. This action will
require a combination of re-grading of surface drainage in the immediate vicinity of the upstream
end of the proposed Grassed Swale and also redirecting the roof downspouts and underground
piping.
4-5
t 22
2001
F
b
ruary
,
e
DPM of the Carolinas- Report of Stormwater Management
LAW Project No. 30100-1-0020

The southwestern edge of the proposed berm for the Extended Dry Detention Basin will encroach
' on a drainage swale, and piping will be necessary to construct the berm. Installation of 26 linear
feet of 18-inch flexible pipe will be required along the invert of the existing swale through the
' area where the berm encroaches, to maintain drainage in this area. Runoff in the swale will be
piped under the berm and discharged back into the open swale before discharging into the creek.
The slope of the existing swale is approximately 0.19 feet per foot, therefore, riprap at the pipe
outlet will need to be installed to dissipate excess energy and prevent erosion. Included in the
' drainage modifications at this site will be inlet protection for the new pipe in the form of riprap,
and cutoff collars installed along the new pipe to prevent the pipe trench from acting as an
' underground drain. The proposed piping of the affected portion of the swale is shown on Figure
2.

1

4-6

DPM of the Carolinas- Report of Stormwater Management
LAW Project No. 30100-1-0020
February 22, 2001
5 EROSION AND SEDIMENT CONTROL DURING CONSTRUCTION
Total disturbed area associated with the site modifications proposed for the plan presented herein
will be approximately 0.63 acre (27,500 square feet). Standard approved erosion and sediment
control practices will be adhered to during the construction of the stormwater management
facilities proposed.
The initial activity to implement the proposed plan elements will to be modify/reconstruct the
Extended Dry Detention Basin. The primary erosion and sediment control measures during this
construction activity will be sediment fencing along the existing creek bank. As the basin is
reconstructed, it will serve as a temporary sediment control facility as well.
Once the basin is completed and stabilized, the Grassed Swale and outlet piping to the basin will
be constructed. After the swale is constructed and stabilized, the roof drainage for the building
will be diverted into the swale.
5-1

r
L

L!

r

r

DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
6 LONG TERM MAINTENANCE OF BMP'S
Once the elements of the proposed stormwater management plan have been constructed and
stabilized, an ongoing maintenance plan for the BMP's will be implemented. Generally, site
drainage and BMP conditions will be monitored on an ongoing basis by regular field inspections.
Erosion observed will be repaired and stabilized. Excessive sediment buildup in the facilities will
be removed and disposed of properly, as will trash and debris accumulations in the facilities. The
improvements will be kept in good condition to ensure that they continue to function in their
intended manner.
In addition to the above general maintenance activities the following activities will also be
implemented for the detention basin:
• Grassed areas will be mowed as necessary to keep grass heights at or below 12
inches.
• Bare spots in grassed will be stabilized and re-seeded as necessary to minimize cover
loss.
• Debris will be removed when it accumulates, or at least annually.
• The basin will be inspected at least annually after a rain event to ensure acceptable
operation.
• The basin will be inspected after every significant (> 5-year frequency) rain event to
verify basin integrity and identify conditions needing repairs.
• Inspections of the basin should at least address erosion or operating problems on the
banks, erosion at the inlet and outlet, sediment accumulation, condition of the
emergency spillway, clogging of the outlet, and woody vegetation in the
embankment.
Swale maintenance will be performed as follows:
• Excess sediment will be removed as necessary, but at least once annually, with the
original contours and grading restored.
• Erosion and bare spots will be repaired as necessary, but at least once annually to
ensure that flow in the swale is evenly distributed across the bottom.
• The swale will be re-vegetated as necessary to prevent bare spots, but at least once
annually.
6-1
' DPM of the Carolinas- Report of Stormwater Management February 22, 2001
LAW Project No. 30100-1-0020
' • The swale will be mowed regularly throughout the growing season, to a maximum
height of six inches.
i
F
GAProjects\30140 Environmental\Stormwater\DPM-Carolinas\reports\dwgwgplan.doc

P

C

1 6-2
Appendix 1
Site Runoff Calculations

C!
F

7

Appendix 1
Site Runoff Calculations

Appendix 2
Detention Basin Volume Calculations
Appendix 3
Water Surface Elevations in Unnamed Tributary
%
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Strip ?•
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1 t (WEGO) Boo ;
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76
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391 1 1 S b9750,
fa
tation(
in
135°22'30='.
80`7'30 535 1520000 FEET 536
?Z0 Mapped, edited, and published by the Geological Survey
<?dal Control by USGS, USC&GS, and North Carolina Geodetic Survey
,p())?raphy by photogrammetric methods from aerial
'-I-I:'-whs taken 1965. Field checked 1969
0

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IF
( 65
537 35' 538
V'r 6-1v
MN r
1 I"

SCS Segmental Travel Time
Summary for DPMcreek
Segment 1: Overland Flow
L =100 ft, S =.1 ft/ft, n = 0.6, P(2yr/24hr) = 3.12 in
Travel Time =15.8 minutes
Segment 2: Concentrated Flow
L = 500 ft, S =.02 ft/ft, Unpaved surface
Travel Time = 3.7 minutes
Segment 3: Channel Flow
A = 40 sq. ft, P =17.3 ft, L = 4000 ft, S = .027 ft/ft, n = .04
Travel Time = 6.2 minutes
Total Travel Time = 25.68 Minutes
t?Yr r i VV -4-1
--
Z414101 AIC-
A3-9
t h IL b 11"PA/s"Al

SCS TR55 Tabular Method
UI'?rf
2,1141 b I Ai
A 3-4
Ofit',`, k,, Lllf. aj
Watershed Title: Unnamed Tributary to Irish Buffalo Creek
2 Year Type II Storm: Precipitation = 3.12 inches
Individual Subarea and Composite Hydrographs
Subarea Time (hrs)
11.0 11.9 12.2 12.5 12.8 13.2 13.6 14.0 15.0 17.0 20.0 26.0
1 0 1 2 34 93 64 32 21 13 8 6 0
Composite 0 1 2 34 93 64 32 21 13 8 6 0
[jEe:pe:a:k:f1owis 93.4 cfs at 12.8 hrs.
1
1
1
1
1
1
1
SCS TR55 Tabular Method
Z1r41o i Ajc,
/13 - 5
Watershed Title: Unnamed Tributary to Irish Buffalo Creek
10 Year Type II Storm: Precipitation = 4.8 inches
Individual Subarea and Composite Hydrographs
Subarea Time (hrs)
11.0 11.9 12.2 12.5 12.8 13.2 13.6 14.0 15.0 17.0 20.0 26.0
1 5 12 25 141 257 144 67 44 27 17 12 0
Composite 5 12 25 141 257 144 67 44 27 17 12 0
The peak flow is 257.5 cfs at 12.8 hrs.

SCS TR55 Tabular Method
Watershed Title: Unnamed Tributary to Irish Buffalo Creek
50 Year Type II Storm: Precipitation = 6.48 inches
l.lf'1ri ?Divv-? .....?--
Z( i 410 l AJC
A-3-(0
C RAO wGP gun
Individual Subarea and Composite Hydrographs
Subarea Time (hrs)
11.0 11.9 12.2 12.5 12.8 13.2 13.6 14.0 15.0 17.0 20.0 26.0
1 11 28 58 286 461 234 105 68 41 26 18 0
Composite 11 28 58 286 461 234 105 68 41 26 18 0
The peak flow is 461.1 cfs at 12.8 hrs.

L-A / I JV I V L) I l/tJ ? %-J
Swale Design
I.
Lo
Input Information
Normal Depth = 1.507 feet
Manning's n = .035
Channel Grade = 0.0275 ft/ft
Left Sideslope = 1.5H:1 V
Right Sideslope = 1-5H: 1V
Bottom Width = 6 feet
Channel Capacity = 93 cfs Z y r (? ;n 5-j-re0.vi4-
Solution Output
Area = 12.45 square feet
Hydraulic Radius = 1.09 feet
Froude Number = 1.21
Velocity = 7.471 ft/s
VxRh = 8.13 square feet/s
Top Width = 10.52 feet
Critical Depth = 1.69 feet
Rip Rap Size (D50) = 5.21 inches

I_I
1 Swale Design
Input Information
Normal. Depth = 3.512 feet
' Manning's n =.035
Channel Grade = 0.0275 ft/ft
Left Sideslope = 1.5H:1 V
' Right Sideslope = 1.5H: 1V
Bottom Width = 6 feet
Channel Capacity = 461 cfs -? 50 yr a %v) SirfCLVYi
' Solution Output
' Area = 39.57 square feet
Hydraulic Radius = 2.12 feet
Froude Number= 1.33
' Velocity = 11.651 ft/s
VxRh = 24.70 square feet/s
Top Width = 16.53 feet
Critical Depth = 4.08 feet
Rip Rap Size (D50) = 30.81 inches
J
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2-11L( lot &jc-
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wt 211401

Appendix 4
Dry Detention Basin Routing Calculations
I

7

Outlet Structure Configuration
Outlet Structure Configuration for DPM Detention Basin Design
Stage 1: Rectangular Orifice
Invert Elevation = 623.7 feet
Width = .1 feet
Height = .1 feet
Discharge Coefficient = .6
Stage 2: Riser Pipe
Crest Elevation = 625.5 feet
Effective Perimeter = 2.1 feet
Effective Flow Area = .35 square feet
Discharge Coefficient = 3.1
Stage 3: Emergency Spillway
Crest Elevation = 627 feet
Crest Length = 15 feet
Discharge Coefficient = 3
Urrri )oIvv - o- vve,p
-&,I 20 10 1
F1 NA LCN I . GSA,
ao 0GP Z-th-/ (
A4-1

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Z? ZOO
t NAi-GRIT. OSC
Basin Rating Curve Al- 2
Outlet Rating Table for DPM Detention Basin Design
Basin Basin Riser Box Tailwater Outfall
Water Outflow Water Elevation Culvert
Elevation (cfs) Elevation (ft) Control
623.00 0.00 N/A N/A N/A
623.50 0.00 N/A N/A N/A
624.00 0.02 N/A N/A N/A
624.50 0.04 N/A N/A N/A
625.00 0.05 N/A N/A N/A
625.50 0.06 N/A N/A N/A
626.00 1.86 N/A N/A N/A
626.50 2.61 N/A N/A N/A
627.00 3.18 N/A N/A N/A
627.50 19.58 N/A N/A N/A
628.00 49.10 N/A N/A N/A
628.50 87.15 N/A N/A N/A
629.00 132.12 N/A N/A N/A
i
133.0 -
106.4
79.8
53.2
26.6
0.0
623.0
5i-PCE - U-Sr -? C-LLVV
FT
"•?"fsE ?FVL?^1-OQG?
/'? ?6.. 2(ZU rA?
/44-3
&&Z,3,17 624.2 625.4 5 626.6 2?,o 627.8 629.0
M

1
1
7q - 9
Modified Puls Routing
' Inflow Hydrograph: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\RCRNT2.HYD
Storage/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.EO

Basin Bypass Capacity = 0.0 cfs
Starting Pool Elevation = 623.7 feet
Time Interval = 2.083333E-02 hours
Event Hydrograph Basin Storage Elevation -Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
' 0.00 0.00 0.00 0.010 623.70 0.02 0.02
0.02 0.35 0.35 0.010 623.72 0.00 0.00

' 0.04
0.06 0.69
1.04 0.69
1.04 0.011
0.012 623.78
623.89 0.01
0.02 0.01
0.02
0.08 1.38 1.38 0.014 624.01 0.02 0.02
0.10
0.12 1.81
2.24 1.81
2.24 0.017
0.021 624.05
624.11 0.03
0.03 0.03
0.03
0.15 2.67 2.67 0.025 624.18 0.03 0.03

r 0.17
0.19 3.10
4.17 3.10
4.17 0.030
0.036 624.27
624.37 0.03
0.04 0.03
0.04
0.21 5.23 5.23 0.044 624.51 0.04 0.04
0.23
0.25 6.29
7.36 .6.29
7.36 0.054
0.065 624.68
624.88 0.05
0.05 0.05
0.05
0.27 6.65 6.65 0.077 625.08 0.06 0.06
0.29 5.95 5.95 0.088 625.27 0.06 0.06
' 0.31 5.24 5.24 0.098 625.43 0.06, 0.06
0.33 4.54 4.54 0.106 625.57 0.34 0.34
0.35 3.97 3.97 0.112 625.68 0.60 0.60
0.37 3.40 3.40 0.117 625.77 0.95 0.95
0.40 2.84 2.84 0.121 625.83 1.21 1.21
0.42 2.27 2.27 0.123 625.86 1.38 1.38
0.44 2.14 2.14 0.124 625.89 1.48 1.48
0.46 2.00 2.00 0.125 625.90 1.55 1.55
0.48 1.87 1.87 0.126 625.91 1.60 1.60
' 0,50 1.74 1.74 0.126 625.92 1.63 1.63 P&d-
0.52 1.59 1.59 0.126 625.92 1.63 1.63
0.54 1.43 1.43 0.126 625.92 1.62 1.62
0.56 1.28 1.28 0.126 625.91 1.58 1.58
0.58 1.13 1.13 0.125 625.90 1.54 1.54
0.60 1.08 1.08 0.124 625.89 1.48 1.48
' 0.62 1.03 1.03 0.124 625.87 1.43 1.43
0.65 0.99 0.99 0.123 625.86 1.38 1.38
0.67 0.94 0.94 0.122 625.85 1.33 1.33
' 0.69 0.90 0.90 0.122 625.84 1.28 1.28
0.71 0.87 0.87 0.121 625.83 1.23 1.23
0.73 0.83 0.83 0.120 625.82 1.18 1.18
' 0.75 0.80 0.80 0.120 625.81 1.14 1.14

u
1

1
1

?I

Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.77 0.77 0.77 0.119 625.80 1.09 1.09
0.79 0.74 0.74 0.119 625.79 1.05 1.05
0.81 0.71 0.71 0.118 625.78 1.01 1.01
0.83 0.69 0.69 0.118 625.77 0.97 0.97
0.85 0.66 0.66 0.117 625.76 0.94 0.94
0.87 0.64 0.64 0.117 625.76 0.90 0.90
0.90 0.62 0.62 0.116 625.75 0.87 0.87
0.92 0.60 0.60 0.116 625.74 0.84 0.84
0.94 0.58 0.58 0.115 625.73 0.81 0.81
0.96 0.56 0.56 0.115 625.73 0.78 0.78
0.98 0.55 0.55 0.115 625.72 0.75 0.75
1.00 0.53 0.53 0.114 625.72 0.72 0.72
1.02 0.51 0.51 0.114 625.71 0.70 0.70
1.04 0.50 0.50 0.114 625.71 0.67 0.67
1.06 0.48 0.48 0.113 625.70 0.65 0.65
1.08 0.47 0.47 0.113 625.70 0.64 0.64
1.10 0.46 0.46 0.113 625.69 0.63 0.63
1.12 0.45 0.45 0.113 625.69 0.62 0.62
1.15 0.43 0.43 0.112 625.68 0.60 0.60
1.17 0.42 0.42 0.112 625.68 0.59 0.59
1.19 0.41 0.41 0.112 625.67 0.58 0.58
1.21 0.40 0.40 0.111 625.67 0.57 0.57
1.23 0.39 0.39 0.111 625.66 0.56 0.56
1.25 0.38 0.38 0.111 625.66 0.55 0.55
1.27 0.37 0.37 0.111 625.65 0.53 0.53
1.29 0.36 0.36 0.110 625.65 0.52 0.52
1.31 0.35 0.35 0.110 625.64 0.51 0.51
1.33 0.35 0.35 0.110 625.64 0.50 0.50
1.35 0.34 0.34 0.109 625.63 0.49 0.49
1.37 0.33 0.33 0.109 625.63 0.48 0.48
1.40 0.32 0.32 0.109 625.62 0.47 0.47
1.42 0.32 0.32 0.109 625.62 0.46 0.46
1.44 0.31 0.31 0.108 625.61 0.45 0.45
1.46 0.30 0.30 0.108 625.61 0.44 0.44
1.48 0.30 0.30 0.108 625.61 0.43 0.43
1.50 0.29 0.29 0.108 625.60 0.42 0.42
1.52 0.28 0.28 0.108 625.60 0.41 0.41.
1.54 0.28 0.28 0.107 625.60 0.40 0.40
1.56 0.27 0.27 0.107 625.59 0.40 0.40
1.58 0.27 0.27 0.107 625.59 0.39 0.39
1.60 0.26 0.26 0.107 625.58 0.38 0.38
1.62 0.26 0.26 0.106 625.58 0.37 0.37
1.65 0.25 0.25 0.106 625.58 0.36 0.36
1.67 0.25 0.25 0.106 625.57 0.36 0.36
1.69 0.24 0.24 0.106 625.57 0.35 0.35
1.71 0.24 0.24 0.106 625.57 0.34 0.34
1.73 0.23 0.23 0.106 625.57 0.33 0.33
1.75 0.23 0.23 0.105 625.56 0.33 0.33
14?-q
Aq-io
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
'
1.77 0.23 0.23 0.105 625.56 0.32 0.32
1.79 0.22 0.22 0.105 625.56 0.31 0.31
1.81 0.22 0.22 0.105 625.55 0.31 0.31
1.83 0.21 0.21 0.105 625.55 0.30 0.30
1.85 0.21 0.21 0.105 625.55 0.30 0.30
1.87 0.21 0.21 0.104 625.55 0.29 0.29
1.90 0.20 0.20 0.104 625.54 0.28 0.28
1.92 0.20 0.20 0.104 625.54 0.28 0.28
1.94 0.20 0.20 0.104 625.54 0.27 0.27
1.96 0.19 0.19 0.104 625.54 0.27 0.27
1.98 0.19 0.19 0.104 625.54 0.26 0.26
1 2.00 0.19 0.19 0.104 625.53 0.26 0.26
2.02 0.19 0.19 0.104 625.53 0.25 0.25
2.04 0.18 0.18 0.103 625.53 0.25 0.25
2.06 0.18 0.18 0.103 625.53 0.24 0.24
2.08 0.18 0.18 0.103 625.53 0.24 0.24
'
Total Routing Mass Balance Discrepancy is 0.03%

1

1

n

Vj D U c F Ie?D LU 44EMT- 10 l?-
Modified Puls Routing
,6,1 lI ? wIUV-1-1000
z! r 3/0 l
Inflow Hydrograph: G:\PROJECTS\30140E-1\,STORMW-ICDPM-CA-I\DESIGN\RCRNTIO.HYD
Storage/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.EO
Basin Bypass Capacity = 0.0 cfs
Starting Pool Elevation = 623.7 feet
Time Interval = 2.083333E-02 hours
Event Hydrograph Basin Storage Elevation Basin Outflow
' Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
' 0.00 0.00 0.00 0.010 623.70 0.02 0.02
0.02 0.63 0.63 0.010 623.74 0.00 0.00
0.04 1.26 1.26 0.012 623.85 0.01 0.01
t 0.06 1.89 1.89 0.015 624.01 0.02 0.02
0.08 2.52 2.52 0.018. 624.07 0.03 0.03
0.10 3.12 3.12 0.023 624.16 0.03 0.03
` 0.12 3.71 3.71 0.029 624.26 0.03 0.03
0.15 4.31 4.31 0.036 624.37 0.04 0.04
0.17 4.90 4.90 0.044 624.51 0.04 0.04
0.19 6.23 6.23 0.053 624.67 0.05 0.05
0.21 7.56 7.56 0.065 624.87 0.05 0.05
23
0 8.89 8.89 0.079 625.11 0.06 0.06
.
0.25 10.22 10.22 0.095 625.39 0.06 0.06
0.27 9.35 9.35 0.112 625.67 0.58 0.58
0.29
0.31 8.48
7.62 8.48
7.62 0.125
0.136 625.90
626.09 1.55
2.00 1.55
2.00
0.33 6.75 6.75 0.145 626.24 2.24 2.24
0.35
0.37 6.01
5.26 6.01
5.26 0.152
0.157 626.35
626.45 2.41
2.54 2.41
2.54
0.40 4.52 4.52 0.161 626.52 2.62 2.62

' 0.42
0.44 3.78
3.59 3.78
3.59 0.164
0.165 626.56
626.59 2.68
2.71 2.68
2.71
0.46 3.41 3.41 0.167 626.61 2.74 2.74
0.48 3.22 3.22 0.168 626.63 2.76 2.76
0.50 3.04 3.04 0.168 656. 2.78 2.78 ?4-I!
0.52 2.81 2.81 0.169 626.64 2.78 2.78
0.54 2.59 2.59 0.168 626.64 2.78 2.78
' 0.56 2.37 2.37 0.168 626.63 2.77 2.77
0.58 2.14 2.14 0.167 626.62 2.75 2.75
0.60 2.07 2.07 0.166 626.60 2.73 2.73
0.62 2.00 2.00 0.165 626.58 2.70 2.70
0.65 1.93 1.93 0.164 626.56 2.68 2.68
0.67 1.86 1.86 0.162 626.53 2.65 2.65
0.69 1.80 1.80 0.161 626.51 2.62 2.62
0.71 1.75 1.75 0.159 626.49 2.59 2.59
0.73 1.69 1.69 0.158 626.46 2.56 2.56
0.75 1.63 1.63 0.156 626.44 2.52 2.52
A q-Iz
Event Hydrograph Basin Storage Elevation Basin Outflow
Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
0.77 1.59 1.59 0.155 626.41 2.49 2.49
0.79 1.54 1.54 0.153 626.38 2.45 2.45
0.81 1.50 1.50 0.152 626.36 2.41 2.41
?. 0.83 1.45 1.45 0.150 626.33 2.37 2.37
0.85 1.42 1.42 0.149 626.30 2.33 2.33

? 0.87 1.38 1.38 0.147 626.28 2.30 2.30
- 0.90 1.35 1.35 0.146 626.25 2.26 2.26
0.92 1.31 1.31 0.144 626.22 2.22 2.22
' 0.94 1.28 1.28 0.142 626.19 2.18 2.18
0.96 1.25 1.25 0.141 626.17 2.14 2.14
0.98 1.22 1.22 0.139 626.14 2.09 2.09
1.00 1.19 1.19 0.138 626.12 2.05 2.05
1.02 1.16 1.16 0.136 626.09 2.01 2.01
1.04 1.14 1.14 0.135 626.07 1.97 1.97
1.06 1.11 1.11 0.134 626.04 1.92 1.92
1.08 1.09 1.09 0.132 626.02 1.88 1.88
1.10 1.07 1.07 0.131 626.00 1.85 1.85
1.12 1.04 1.04 0.129 625.97 1.81 1.81
1.15 1.02 1.02 0.128 625.95 1.77 1.77
1.17 1.00 1.00 0.127 625.93 1.68 1.68
' 1.19 0.98 0.98 0.126 625.91 1.60 1.60
1.21 0.96 0.96 0.125 625.89 1.52 1.52
1.23 0.95 0.95 0.124 625.88 1.45 1.45
1.25 0.93 0.93 0.123 625.86 1.39 1.39
1.27 0.91 0.91 0.122 625.85 1.33 1.33
1.29 0.90 0.90 0.122 625.84 1.28 1.28
1.31 0.88 0.88 0.121 625.83 1.23 1.23
1.33 0.86 0.86 0.120 625.82 1.18 1.18
1.35 0.85 0.85 0.120 625.81 1.14 1.14
' 1.37 0.84 0.84 0.119 625.80 1.11 1.11
1.40 0.82 0.82 0.119 625.79 1.07 1.07
1.42 0.81 0.81 0.119 625.79 1.04 1.04
1.44 0.80 0.80 0.118 625.78 1.01 1.01
1.46 0.78 0.78 0.118 625.77 0.98 0.98
48
1 0.77 0.77 0.117 625.77 0.96 0.96
.
1.50 0.76 0.76 0.117 625.76 0.93 0.93
1.52 0.75 0.75 0.117 625.76 0.91 0.91
1.54
1.56 0.74
0.73 0.74
0.73 0.117
0.116 625.75
625.75 0.89
0.87 0.89
0.87
1.58 0.71 0.71 0.116 625.75 0.85 0.85
' 1.60
1.62 0.71
0.70 0.71
0.70 0.116
0.116 625.74
625.74 0.84
0.82 0.84
0.82
1.65 0.69 0.69 0.115 625.73 0.80 0.80
1.67 0.68 0.68 0.115 625.73 0.79 0.79
1.69 0.67 0.67 0.115 625.73 0.77 0.77
1.71 0.66 0.66 0.115 625.72 0.76 0.76
1.73 0.65 0:65 0.115 625.72 0.75 0.75
1.75 0.64 0.64 0.115 625.72 0.73 0.73
' lut` r ` -301UO- 1-()04:f- L)
Modified Puls Routing
Inflow Hydrograph: G:\PROJECTS\30140E-I\STORMW-I\DPM-CA-I\DESIGN\RCRNT50.HYD
Storage/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINAL.ES
Discharge/Elevation Curve: G:\PROJECTS\30140E-1\STORMW-I\DPM-CA-I\DESIGN\FINALCNT.E
Basin Bypass Capacity = 0.0 cfs
Starting Pool Elevation = 623.7 feet
Time Interval = 2.083333E-02 hours
Event Hydrograph Basin Storage Elevation Basin Outflow
1 Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)
' 0.00 0.00 0.00 0.010 623.70 0.00 0.00
0.02 1.06 1.06 0.011 623.76 0.01 0.01
0.04 2.11 2.11 0.013 623.96 0.02 0.02
0.06 3.17 3.17 0.018 624.07 0.03 0.03
0.08 4.23 4.23 0.024 624.17 0.03 0.03
0.10 5.01 5.01 0.032 624.31 0.04 0.04
0.12 5.79 5.79 0.041 624.47 0.04 0.04
0.15 6.57 6.57 0.052 624.65 0.05 0.05
0.17 7.35 7.35 0.064 624.85 0.05 0.05
' 0.19 8.96 8.96 0.078 625.09 0.06 0.06
0.21 10.57 10.57 0.094 625.38 0.06 0.06
0.23 12.17 12.17 0.113 625.70 0.78 0.78
0.25 13.78 13.78 0.133 626.04 1.92 1.92
0.27 12.75 12.75 0.152 626.37 2.41 2.41
29
0 11.72 11.72 0.169 626.65 2.78 2.78
' .
0.31 10.69 10.69 0.183 626.89 3.06 3.06
0.33 9.65 9.65 0.194 627.07 5.45 5.45 F F-A
0.35
0.37 8.72
7.78 8.72
7.78 0.198
0.198 627.14
627 7.88
8.12 7.88
8.12
0.40 6.85 6.85 0.197 627.13 7.60 7.60
0.42 5.91 5.91 0.196 627.11 6.80 6.80
0.44 5.67 5.67 0.195 627.09 6.14 6.14
0.46 5.42 5.42 0.194 627.08 5.75 5.75
0.48
0.50 5.18
4.93 5.18
4.93 0.194
0.193 627.07
627.06 5.46
5.19 5.46
5.19
0.52 4.62 4.62 0.193 627.05 4.92 4.92
0.54 4.31 4.31 0.192 627.04 4.63 4.63
0.56 4.01 4.01 0.192 627.03 4.32 4.32
0.58 3.70 3.70 0.191 627.03 4.02 4.02
0.60 3.59 3.59 0.191 627.02 3.78 3.78
' 0.62 3.49 3.49 0.190 627.01 3.62 3.62
0.65 3.39 3.39 0.190 627.01 3.51 3.51
0.67 3.29 3.29 0.190 627.01 3.40 3.40
' 0.69 3.21 3.21 0.190 627.00 3.30 3.30
0.71 3.12 3.12 0.190 627.00 3.21 3.21
0.73 3.04 3.04 0.189 627.00 3.18 3.18
' 0.75 2.96 2.96 0.189 626.99 3.17 3.17

Event Hydrograph Basin Storage Elevation . Basin Outflow
' Time Inflow Inflow Used Above MSL Outflow Total
(hours) (cfs) (cfs) (acre-ft) (feet) (cfs) (cfs)

0.77 2.89 2.89 0.189 626.99 3.17 3.17
0.79 2.83 2.83 0.188 626.98 3.16 3.16
0.81 2.76 2.76 0.187 626.97 3.14 3.14
0.83 2.69 2.69 0.187 626.95 3.13 3.13
0.85 2.64 2.64 0.186 626.94 3.11 3.11
' 0.87 2.58 2.58 0.185 626.93 3.10 3.10
0.90 2.53 2.53 0.184 626.91 3.08 3.08
0.92 2.47 2.47 0.183 626.89 3.06 3.06
0.94 2.43 2.43 0.182 626.88 3.04 3.04
0.96 2.38 2.38 0.181 626.86 3.02 3.02
0.98 2.33 2.33 0.180 626.84 3.00 3.00
' 1.00 2.29 2.29 0.179 626.82 2.97 2.97
1.02 2.25 2.25 0.178 626.80 2.95 2.95
1.04 2.21 2.21 0.176 626.78 2.93 2.93
1.06 2.17 1,17 0.175 626.76 2.90 2.90
1.08 2.13 2.13 0.174 626.73 2.88 2.88
1.10 2.10 2.10 0.173 626.71 .2.85 2.85
' 1.12 2.06 2.06 0.171 626.69 2.83 2.83
1.15 2.03 2.03 0.170 626.67 2.80 2.80
1.17 1.99 1.99 0.169 626.64 2.77 2.77
1.19 1.96 1.96 0.167 626.62 2.75 2.75.
1.21 1.93 1.93 0.166 626.60 2.72 2.72
1.23 1.90 1.90 0.165 626.57 2.69 2.69
1.25 1.87 1.87 0.163 626.55 2.67 2.67
1.27 1.85 1.85 0.162 626.53 2.64 2.64
1.29 1.82 1.82 0.161 626.50 2.61 2.61
' 1.31 1.80 1.80 0.159 626.48 2.58 2.58
1.33 1.77 1.77 0.158 626.46 2.55 2.55
1.35 1.75 1.75 0.156 626.44 2.51 2.51
' 1.37 1.72 1.72 0.155 626.41 2.48 2.48
1.40 1.70 1.70 0.154 626.39 2.45 2.45
1.42 1.68 1.68 0.153 626.37 2.41 2.41
' 1.44 1.66 1.66 0.151 626.35 2.38 2.38
1.46 1.64 1.64 0.150 626.33 2.35 2.35
48
1 1.61 1.61 0.149 626.31 2.32 2.32
.
1.50 1.59 1.59 0.148 626.29 2.29 2.29
1.52 1.58 1.58 0.146 626.27 2.26 2.26

' 1.54
1.56 1.56
1.54 1.56
1.54 0.145
0.144 626.25
626.23 2.23
2.20 2.23
2.20
1.58 1.52 1.52 0.143 626.21 2.17 2.17
1.60
1.62 1.50
1.49 1.50
1.49 0.142
0.141 626.19
626.17 2.14
2.11 2.14
2.11
1.65 1.47 1.47 0.140 626.15 2.09 2.09
1.67 1.45 1.45 0.139 626.13 2.06 2.06
' 1.69 1.44 1.44 0.138 626.11 2.03 2.03
1.71 1.42 1.42 0.137 626.10 2.01 2.01
1.73 1.41 1.41 0.136 626.08 1.98 1.98
1.75 1.39 1.39 0.135 626.06 1.96 1.96
Aq--15
i
Event
Time
(hours) Hydrograph
Inflow
(cfs) Basin
Inflow
(cfs) Storage
Used
(acre-ft) Elevation Basin
Above MSL Outflow
(feet) (cfs) Outflow
Total
(cfs)
1.77 1.38 1.38 0.134 626.05 1.93 1.93
1.79 1.36 1.36 0.133 626.03 1.91 1.91
1.81 1.35 1.35 0.132 626.02 1.88 1.88
1.83 1.34 1.34 0.131 626.00 1.86 1.86
1.85 1.32 1.32 0.130 625.98 1.81 1.81
1.87 1.31 1.31 0.129 625.97 1.76 1.76
1.90 1.30` 1.30 0.129 625.96 1.71 1.71
1.92 1.28 1.28 0.128 625.95 1.67 1.67
1.94 1.27 1.27 0.127 625.94 1.63 1.63
1.96 1.26 1.26 0.127 625.93 1.59 1.59
1.98 1.25 1.25 0.126 625.92 1.56 1.56
2.00 1.24 1.24 0.126 625.91 1.53 1.53
2.02 1.23 1.23 0.125 625.90 1.50 1.50
2.04 1.22 1.22 0.125 625.89 1.47 1.47
2.06 1.21 1.21 0.124 625.88 1.44 1.44
2.08 1.20 1.20 0.124 625.88 1.42 1.42
Total Routing Mass Balance Discrepancy is 0.03%
Aq--ico
Appendix 5
Grassed Swale Calculations

A5-3
Swale Design CHi?0 P, 716/61
Input Information
Normal Depth = 0.335 feet
Manning's n = .04
Channel Grade = .014 ft/ft
Left Sideslope = 3H: IV
Right Sideslope = 3H:1 V
Bottom Width = 10 feet
Channel Capacity = 7.36 cfs --?---?{ lS 7
Solution Output
Area = 3.69 square feet
Hydraulic Radius = 0.30 feet
Froude Number = 0.63
Velocity = 1.995 ft/s
VxRh = 0.61 square feet/s
Top Width = 12.01 feet
Critical Depth = 0.25 feet
Rip Rap Size (D50) = N/A
i
i
i
i
X15-4
Swale Design Q 7
Input Information
I No Dew = 0.406 feet
Manning's n = .04
Channel Grade = .014 ft/ft
Left Sideslope = 3H: 1V
Right Sideslope = 3H:1 V
Bottom Width = 10 feet
Channel Capacity = 10.22 cfs ---? 1 (?
Solution Output
Area = 4.56 square feet
Hydraulic Radius = 0.36 feet
Froude Number = 0.65
Velocity = 2.242 ft /s
VxRh = 0.81 square feet/s
Top Width = 12.44 feet
Critical Depth = 0.31 feet
Rip Rap Size (D50) = N/A
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NO. 340DR-10 DIETZGEN GRAPH PAPER DIETZGEN CORPORATION
' 10 X 10 PER INCH MADC IN U.N.A.

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NO. 340DR-10 DIETZGEN GRAPH PAPER DIETZGEN CORPORATION
10 X IO PER INCH - MADC IN U.S.A.
LAWGII]BBBAk
G R O U P
AUG 1 5 2000
August 11, 2000
UP
Mr. John Domey' .n W1 Q1l LtIY SEirT
Non-discharge Branch/Wetlands/401 Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
Subject: DPM of the Carolinas
After-the-Fact Permit
Unnamed Tributary of Irish Buffalo Creek
DWQ Project No. 000034
Cabarrus County, North Carolina
LAW Project No. 30100-9-4882
Dear Mr. Domey:
As you are aware, Law Engineering and Environmental Services, Inc. (LAW) is the authorized agent
for DPM of the Carolinas with respect to the Section 404 Wetlands Permit and Section 401 Water
Quality Certification in the above-referenced matter. This letter is being written in response to your
letter dated April 6, 2000 (Attachment A). Your written correspondence stated that the current on-
site stormwater management devices are not designed to meet 85% TSS removal. Since the issuance
of your letter, a copy of the NCDENR Storm Water Best Management Practices (dated April 1999)
has been forwarded to Mr. Harkey of DPM of the Carolinas, per his request. The current sediment
ponds are being redesigned by Mansour Edlin Consulting in an effort to meet the 85% TSS removal
criterion.
In addition, your letter revealed that on-site stream mitigation did not meet stream restoration as
defined in North Carolina Water Quality General Certification 43257 and that other forms of
mitigation, such as payment to the Wetlands Restoration Program, must be arranged in order to
provide a complete Water Quality Certification application. In response to this comment Ms. Lisa J.
Beckstrom, LAW Project Environmental Scientist, on behalf of DPM of the Carolinas, spoke with
Mr. Ron Ferrell of the N.C. Wetlands Restoration Program on August 2, 2000 to ask for
consideration of payment into the wetland restoration fund as compensatory mitigation for impacts
associated with this project. To date, we are awaiting a decision from Mr. Ferrell. Please hold this
application open until these tow items are provided to you in writing.
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 • Charlotte, NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area for over 50 years
Mr. John Dorney
August 11, 2000
Page 2
We appreciate your continued assistance in the processing of this After-the-Fact permit. Please call
Mike Iagnocco at [phone], extension 5543 if you have any questions.
Sincerely,
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
?co P/L/
Micha . Iagnocco Allen W. Conger, P.W.S.
Senior Environmental Scientist
gym-- WITH PERMISSION
cc: Mr. Todd St. John, Division of Water Quality
Mr. Bo Dickens, DPM of the Carolinas
Mr. Samar Bou-Ghazale, Mooresville Regional Office
Principal
Environmental Scientist
BY? WITH PERMISSION
APR-17-2000 MON 08:37 AM FAX NO. P. 01
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
Mr. Todd Dickens
DPM of the Carolinas
00 Spring Street, SW
Concord, NC 28025
NTWA
i
?
NCE'
1
April 6, 2000
Re: On-site Visit DPM of the Carolinas, IIWY
29/601 Unauthorized Stream Impacts
Cabarrus County
D W Q # 000034
Dear Mr. Dickens:
A site visit was conducted on April a, 2000 by Mr. Tcdd St. John and Mr. Dave Pcnrose of this Office, Mr.
Samar Bou-Ghaaale of DWQ's Mooresville Regional Office, and Mary C. Murray of LAW Engineerin&
As a result of this site visit, it has been determined that a stormwater management plan that includes RMPs
designed to remove 85% TSS per the NC DENR Stormwater Deg Management Practices Manual (April
1999) will be required as part of any 401 Water Quality Certification that may be issued. The current
stormwater management devices do not appear to meet this requirement. The stormwater management
requirement is a standard requirement for commercial developments and is in addition to the mitigation
requirements-for the stream impacts. (See 15A NCAC 211.0506)
Also, please be advised that in order to provide on site stream mitigation for the unauthorized stream
impacts, an on-site stream mitigation plan must be designed as a stream restoration as defined in North
Carolina Water Quality General Certification # 3257 (also discussed in our correspondence with Law
Engineering dated 22 February 2000):
"Stream restoration is defined as the process of converting an unstable, altered or degraded stream
corridor, including adjacenr riparian zone and flood-prone areas to its natural or referenced, stable
conditions considering recent and ficture watershed conditions. This process also includes restoring the
'Qeon?orphic dimension, pattern, and profile as well as biological and chemical integrity, includbig
n•nasport of warer and sediment produced by the stream's watershed in order to achieve dynamic
equilibrium. "
Staff diSCll55iong with your consultant, LAW Engineering have indicated that there may be some
misunderstanding regarding this matter. Please be advised that if an on-site stream mitigation plan can not
be made to meet the above definition, other forms of mitigation such as payment to the Wetlands
Restoration Program must be arranged in order for ro provide a complete Water Quality Certification
application. Also, it was brought up io our Stal'f, at the subject tneetin,-, that Staff from Cabarrus County
erosion control required that the channel be rip rapped in order to provide stability, and, as such, you were
concerned that there may be conflicting requirements. However, it appears that the lack of stability was
caused by the relocation and straightening of the stream. Rip rap is one means of providing stability to a
disturbed channel. However, this type of activity requires a 404 Permit (or coverage under an existing
Nationwide Permit) as well aS a 401 Water Quality Certification. Thesc types of impacts may also require
4401 Reedy Creek Road, Raleigh, NC 27^007 Telephone [phone] FAX [phone]
An E=qual Opportunity Affirma!ivo Action Brrploygr 50% recycled! 10% post-consumer papor
HVK-1 f-i UUU MON U3: 3 f AM FAX NO. . P. 02
stream mitigation in sonic instances, including the subject instance. In any event, there are other types of
stabilization and channel modification design practices that do not require the use of rip rap. These types of
practices attempt to provide a channel design that conrorms to a stream's natural tendencies in order to
provide natural stability ns well as habitat. This type of dcaign is called natural channel design, or, in this
case, stream restoration (see the above definition). Stream restoration is one way to provide mitigation for
the impacts resulting from the relocation and rip rapping of the Subject stream channel. Also, it is possible
under certain circumstances to receive a 401 Water Quality Certification to relocate and rip rap a ,$VCam;
however, as stated before, mitigation is often required for these types of impacts. In the subject case,
miti-ation shall be required for the unauthorized stream impacts in order to obtain a Water Quality
CcruCitation.
As such, we a re requesting that a stream mitigation plan as well as a stormwarer management plan that
meet the above requirements be submitted within 30 days of receipt of this letter in order to prevent your
401 Water Quality Certification application from being returned as incomplete.
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place
this project on hold due to incomplete information (15A NCAC 2II.0507(a)(4)). Also, please be advised
that the Division's Mooresville Regional Office sent you a Notice of Violation on 29 January 1999 for the
subject unauthorized impacts. The Mooresville Regional Office will determine if it will make a
recommendation for Enforcement to the Director based on your response to the Notice of Violation,
?incere?y,
Ffn Dorney
uality Cvication Program
Attachment
cc: Mooresville DWQ Regional Office
Todd St. John
Central Files
Dave PcnroAe
TO 19197339959

SHEET
P.02/06
P.01/06
LAW ENGINEERING AND ENVIRONMEVTAL SERVICES, INC.
2801 Yorkmout Roa
Charlotte, North Ca,ro,uto 11-48
? For Review ? Please Comment ? plea Reply ? Please Recycle
AUG 11 2000 16:59 FR LAW ENGINEERING
AUG 11 2000 16:59 FR LAW ENGINEERING
G R Q ,CJ
FACSIMILE TRANSMITT
To: - S4 From: .c.f J &C-
Company: /J a wQS? Date'Y'r+smitted: 8111 "
Phone Number: Q ,? 3 3 0 5q LJ Teleph+: [phone]
I
Fax Number: Fax Nu her: [phone] (J
Subject: vii. p Hard C y to Follow: Yes
No. pages transmitted (incl. cover)
CC:
COMMENTS:
3'78638 TO 19197339959
II
JO
l
s
No
CONFIDENTIALITY NOTICE: This message is intended only for a use of the individual or entity to which It is
addressed, and may contain information that is privileged, confidenti I, and exempt from disclosure udder applicable
low. If the reader of this message is not the intended recipient, or the employee or agent responsible for delivering the
message to the intended recipient, you are hereby notified that an dissemination, distribution, or copying of this
communication is strictly prohibited. If you have received this commu}icntion in error, please notify us immediately by
telephone and return the original message to us at the above address vi the US Postal Service. Thank you.
If transmission is not received in good ¢rder, please call
AUG 11 2000 16:59 FR LAW ENGINEERING 378638 TO 19197339959 P.02i06
LAWGE?B
??.CD-?V
August l 1, 2000
Mr. John Domey
Non-discharge Branch/Wedands/401 Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
Subject: DPM of the Carolinas
After-tbe-Fact Permit
Unnamed Tributary of Irish Buffalo - _
DWQ Project No. 000034
CabuTus County, North Carolina
LAW Project No. 30100-9-4882
Dear Mr. Domey: i
As you are aware, Law Engineering and Environmental S Lc, lnc. (LAW) is the authorized agent
for DPM of the Carolinas with rasped to the Section 404 etlands Permit and Section 401 Water
Quality Certification in 1he above-referenced matter. This 1 is being written in response to your
letter dated April 6, 2000 (Attachment A). Your written omTespondeace stated that the current on-
site storrawater management devices are not designed tom 85% TSS removal. Since the issuance
of your letter, a copy of the NCDENR Storm Water Hest nageI?ent practices (dated April 1999)
has been forwarded to Mr. Harkey of DPM of the Caro ' per his request. The current sediment
ponds are being redesigned by Mansour Edlin Consulting in an effort to meet the 85% TSS removal
criterion.
i
In addition, your letter revealed that on-site stream mitigation did not meet stream restoration as
defined in North Carolina Water Quality General Certification #3257 and that other forms of
mitigation, such as payment to the Wetlands Restoration rogram, must be arranged in order to
provide a complete Water Quality Certification application. in response t0 this comment Ms. Lisa J.
Beckstrom, LAW Project Fnvironmeidal Scientist, or ^F IDPM of the Carolinas, spoke with
Mr. Rion Ferrell of the N.C. Wetlands Restoration P on August 2, 2000 to ask for
consideration of payment into the wetland restoration fund comipensatory mitigation for impadS
associated with this project. To date, we are awaiting a ' ion from Mr. Ferrell. Please hold this
application open until these tow items are provided to you iris writing.
LAW Engineering and Environment l Services, Inc.
2801 Yorkmont Road, Suite 100 • C riotte. NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area for ovgr 50 years
AUG 11 2000 16:59 FR LAW ENGINEERING 3178638 TO 19197339959 P.03i06
Mr. JWm Domey R
August 11, 2000
Page 1
act permit. Please call
Aftw-d 4r
We appreciate your caoactiiued assistance in the p=Ming 4,tt
Mske =o at [phone], a lion 5543 if ?,
Sincerely,
Law ENGINEEMCY AND ENVIRONMENTAL SERVIC , INC.
mit A uv:o
I
Senior F,mvii un? deatist
BY WriH PERMISVON
cc: Mr. Todd St. John, Diva= ofWater Quality
Mr. Bo Didkens, DPM ofthe Carolinas
Mr. Samar Bou-GW210, Mooresv0le Re&CW ol?
aLttA, Ul - 0&kw
ARM W. Coouge'r, P.W.S.
Principal
Envl Scientist
BY WITH PERMISSION -------- ?-w
AUG 11 2000 16:59 FR LAW ENGINEERING
APR-17-2000 MON 08:37 AM
r '
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
Mr. Todd Dickens
OPM of b., Carolina
80 Spring Street, SW
Concord, NC 28025
3578638 TO 19197339959
FAX NO.
April 6, 2000
P.05/06
P. 01
Ra: On site Visit DPM of the Carat ads, Ii'WY
2901 una,=rizcd stream Impacts
Ca arru$ County
V*Q # 000034
Dear Mr Dickens:
A site visit was conducted on April 4.2000 by Mt, Todd St. John nd Mr. Dave Penrose of this Office, Mr.
Samar Rou-Ghazale of DWQ's Mooresville Regional Ol iec, arullMary C. Murray of LAW Lngipcedng.
As a result of this site visit, it has been detonrtined that a stormwsiter management plan that includes i3MPs
designed to remove 85% TSS per the NC D NR Srormwarr• P-4 "A??o?e?ne?rr Practices Manual (April
1999) will be required as part of any 401 Water Quality CertiFt:a on that may be issued. The currant
stormwater management devices do not appear to meet this requi enL The stormwater management
requirement is a standard requirement for commercial deveiopm is and is in addition to the mitigation
requirements, for the stream impacts. (See 15A NCAC 211.0506)
Also, please be advised that in order to provide on site stream tai igation for die unauthorized stream
impacts, an on-size stream mitigation plan must be designed as trearn restoration as defined in North
Carolina Water Quality General Certification # 3257 (also discussed in our correspondence with Law
Engineering dated 22 Pebiumy 2000):
"Strea?n resrorallan is deft,tcd as the process of canyerrieig an w1srable, altered or degraded srrra,n
corriefor, Including adjacenr riparla?t zone euid flood-probe area, to im nanurtl or referenced. rrable
catdirions considering reeenr a:d f eture watershed eondirfa,es. hlr process also Include: MOOrin,Q rftd
.teomorpltic dimension, p4tre,7t, and profile as welt as biologica and chemical ittregrly, including
&,rinspoq t ;f worar uxd sEYlitnent produced by for srrertnl'J warty hec(ht order ro achleve dyaa„ric
equilibru,nt. "
Starr discussions with your consulmni, LAW Enginuering have i
misunderstanding regarding this matter. Please be advised that i,
be made to meet the above definition, other forms of mitigation
Rcrtoration Fro;ram must be arranged in order for to provido a
application. Also, it was brought up to our Start, at the subject n
erosion control required that the channel be rip rapped in order.i
concerned that, there may be conflieting requirements. However
caused by the relocation and straightening of the strcar: r, `-
dlsturbcd channel. ilowewr, this type of activity rcquires n404
Nationwide Permit) as well as a 401 Water Quality Cerdficatiol
4401 Reedy Creek Road, Raleigh, NO 27607 Tele
An Equal Opponunily Affirmative Action Errplwir 60%
idicated that there may be some
an on•silt stream lltitigntion plan Can net
uch as payment to the Wetlmds
omplete Water Quality Certification
acting, that Staff from Cabarrus County
provide stability. ands as such. you were
it appears that the lack of stability was
t -,=A of providing stability to a
'ermit (or coverage under an existing
These types of impacts may also require
919.733.1896 FAX [phone]
41 lo% post-consumer paper
AUG 11 2000 17:00 FR LAW ENGINEERING 3$78638 TO 19197339959 P.06i06
ArK-11-'d000 MUN ub:3 ( AM F. U2

stream mitigation in soma instances, including the subject instance. in any event. there are other types of
stabilization and channel modification design practices that do not roquire the use of rip rap. Those types of
practices attempt to provide a channel design that conformi to a stream's natural tendencies in order to
provide natural stability as well as habitat. This type of design is cared natural channel design, or, in this
case, stream restoration (see the above definition). Stream restoration is one way to provide titiga6on for
the iatpacts resulting from the relocation and rip rapping of the subject stream channel, Also, it is possible
under certain circumstances to receive a 401 Water Quality Certification to relocate and rip rap a stream;
however, as stated before, mitigation is often required for these types of impacts. in the subject case,
mki3atian shall be required for the unauthorized stream impacts in ¢rder to obtain a Water Quality
Certification,
As such. we a rc requesting that a strain mitigation plan as wall ac stormwater management plan that
meet the above requirements be submitted within 30 days of reecipi of this letter in order to prevent your
401 Water Quality Certification application from being return ul es Ineomplete.
I cats be reached at 919-733-1786 if you Nava any questions. Until This informatiun is received, I will place
this project on hold due to incomplete infortnation (15A NCAC 2I•II,0507(a)(4)). Also, please be advised
that the Division's Mooresville Regional Office sent you a Notice Violation on 29 January 1999 for the
subject unauthorized impacts. The Mooresville Regional Office wi I determine if it will make a
Recommendation far 1:nforcetnent to the Director bred on your re porde to the Notice of Violation.
Atmchment
cc: Mooresville DWQ Regional Office
Todd St. John ,
Central Files f
Dave Penrose
ugram
** TOTAL PAGE.06 **
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place
this project on hold due to incomplete information (15A NCAC 2H.0507(a)(4)). Also, please be advised
that the Division's Mooresville Regional Office sent you a Notice of Violation on 29 January 1999 for the
subject unauthorized impacts. The Mooresville Regional Office will determine if it will make a
Recommendation for Enforcement to the Director based on your response to the Notice of Violation.
cc: Mooresville DWQ Regional Office
Todd St. John
Central Files
Dave Penrose
Mr. Michael Iagnocco, LawGibb, 2801
Sincerely,
(? , i R. orney
ter Quality C ion Program
W rtific
Yorkmont Road, Charlotte, NC 28208
(?A?to
F

LAW
ENGINEERING AND ENVIPONMENTAL SERVICES
0 oaN
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
2801 Yorkmont Road, Suite 100 Date: December 23, 1999 Project No.: 30100-9-4882
Charlotte NC, 28208 Project Name: DPM of the Carolinas US Highway 29/601 site
[phone] FAX [phone] Attention: John Dorne
Re: After-t..e-Fact NWP No. 26, 'c ,ion
TO: Mr. John Dorney
Non-discharge Branch/Wetlands/401 Unit
1621 Mail Service Center 10
Raleigh, NC 27699-1621
LETTER OF TRANSMITTAL
WE ARE SENDING I OU X Attached Under separate cover via t c gllowin
Prints Plans Samples Specifications a
Copy of letter Change order Other
IF ENCLOSURES ARE NOT AS NOTED, KINDLY NO'1'1FY US A1' ONCE
COPIES DATE NO. DESCRIPTION
7 12/23/99 1 After-the-Fact NWP No. 26 Application
THESE ARE TRANSMITTED as checked below:
_L _For approval _ Approved as submitted
_ For your use _ Approved as noted
_ As requested _ Returned for corrections
For review and comment
_ Resubmit
_ Submit _
_ Return _
copies for approval
_ copies for distribution
corrected prints
REMARKS: Law Engineering and Environmental Services, Inc. is submitting the necessary documentation for the after
the fact Nationwide Permit (NWT) No. 26 permit (and DWQ processing check) for the DPM of the Carolinas US
Highway 29/601 site. Please contact Michael A. Ia.gnocco at (704)-357-8600, if you have apy questions regarding this
information.
RESPECTFULLY SUBMITTED,
.W ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
Michael A. Iagncco V
Senior Environmtal Scientist
Copy To: File
Allen W. Conger, P.W.S.
10_1? &I - I
Principal
Envi onmental Scientist
t3y aw With Permission
LAW
LAWGIBB rocs errs erA&
December 23, 1999
Mr. Steve Chapin
U.S. Army Corps of Engineers
Regulatory Branch
151 Patton Avenue, Rm. 143
Asheville, NC 28801-5006

t

u

Subject: After-the-Fact Nationwide Permit No. 26 Application
U.S. Highway 29/601 Office Building Site
Concord, North Carolina
LAW Project No. 30100-9-4882
USACE Action ID: 199930611
Dear Mr. Chapin:
tk
P4N&VT
1'tC?IVID
On behalf of DPM of the Carolinas (DPM) enclosed please find a completed Joint Form (Attachment
A) with accompanying figures for an after-the-fact Nationwide Permit No. 26 application in the
above-referenced matter. DPM has retained Law Engineering and Environmental Services, Inc.
(LAW) to provide stream channel restoration services for this project and to act as its agent in this
matter. An executed `Agent Certification of Authorization' form is enclosed (Attachment B). The
proposed U.S. Highway 29/601 Office Building site is located along the west side of U.S. 29/601 just
north of the U.S. 29/601 intersection in Concord, North Carolina (Attachment C, Figure 1).'WM
°MC'bias requested DPM submit an application' fbr°' an after-the-fact`" `permit "stream,,
m. ti at onlr tc ratr?ar?yplar #err the utranth rrzett relocation `nf appf6xim6tely 270 linear feet>,ofstream,,.,
chanavC--1taohment,D). Since the project's impacts total more than 150 linear feet of an above-the-
headwaters stream, this application and mitigation plan are being provided in accordance with the
Wilmington District's regional conditions for Nationwide Permit No. 26.
BACKGROUND
The DPM of the Carolinas (DPM) property encompasses approximately 7.0 acres. The subject site is
located immediately north of an existing laser tag facility (Jubilation Jungle). LAW was contracted by
Mansour Edlin Consultanting, Inc. (MEC) to conduct a preliminary wetlands review at the site prior to
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road • Charlotte, NC 28208
704-357-8600 • Fax: [phone]
¦
After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
¦
a
After-the-Fact Nation-vide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
the development of the site. An approximate 10,000 square foot office building was recently
¦
constructed on the subject property. A Notification of Unauthorized Activity/Permit Noncompliance
dated March 19, 1999 was issued by the USACE (Attachment E). The unauthorized activity; consisted?
of the?_relocation -of approximately 270 linear-feet of an unnamed tributary Irish Buffalo Creek The
relocation took place in the fall of 1998. The revised construction drawing plan entitled, "Drainage and
Erosion Control Plan" provided by MEC and Carlos Moore Architects dated, April 29, 1998, specified
the relocation of approximately 130 linear feet (Attachment C, Figure 2). The above-mentioned site
plan also included a realignment of a sanitary sewer line that involved two stream crossings. The stream
and sewer relocation were unavoidable in order to accommodate the 2:1 fill slopes associated with the
¦ construction of the 10,000-square foot office building. Sediment and erosion control measures
implemented during building construction included a network of silt fence, rock check dams, and
M sediment basins. Sediment basins were converted to permanent storm water detention basins following
stabilization of the site to facilitate long-term storm water management. The grading contractor, in
charge of executin.g. the construction ...Plan, straightened approximately 270 linear feet (1.f? of channel
_- - _ .?.-,..-. :...., ..:._ _u.... ,a wv. .» ....., ?, _ ?....v?aM...,,,W.
instead of the proposed approximately 130 if specified on the site plan. The relocated/straightened
channel totals approximately 230 If in length with 3:1 bank slopes. The relocation has resulted in a loss
of approximately 40 if of stream channel. During the construction process, stream flow was directed into
the relocated channel prior to stabilization. Consequently, in-stream conditions warranted the placement
of riprap fill and filter fabric into approximately 350 if of channel to stabilize erosion. The contractor/
l• DPM indicated that these stabilization activities were performed as directed by a representative of the
Cabarrus County Erosion Control (CCEC). To facilitate riprap placement, CCEC also advised that the
remaining streamside vegetation be removed.
As part of the Notification of Unauthorized Activity, the USACE has requested an application for an
after-the-fact permit for the aforementioned unauthorized activities, which must include an acceptable
stream mitigation/restoration plan. In effort to resolve this issue, DPM executed a contract with LAW in
August 1999 to provide Section 404 permitting and stream mitigation and restoration services. LAW
environmental scientists visited the site on August 25, 1999 to assess the conditions of the relocated
channel.
a

After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
Your prompt decision in this matter and corresponding processing of this permit will be greatly
appreciated. Seven copies of this PCN have been forwarded to Mr. John Dorney at DWQ. Please do
not hesitate to call Mike Iagnocco at [phone] ext. 5543, if you have any questions.
Sincerely,
LAW ENGINEERING AND ENVIRONMENTAL SERVICES INC.
Wa4rn?#Ar "
Mary C. Murray ichael A. la cc
Staff Environmental Scientist Senior Environ ent Scientist
Allen W. Conger, P.W. .
Principal
EnvironmenttPcientist VAdj With Permission
Enclosures: Attachment A - Joint Form - Nationwide Permit No. 26
Attachment B - Agent Authorization Form
Attachment C Figures
Attachment D - Photographs
Attachment E - Notice of Unauthorized Activity
Attachment F - Compensatory Stream Mitigation Plan
'
cc: Mr. John Dorney, DWQ
Mr. Mansour Edlin, P.E.
Mr. Todd H. Dickens, DPM

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
CERTIFIED MAIL RETURN RECEIPT REQUESTED
Mr. Todd Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, NC 28025
Dear Mr. Dickens:
A ??
NCDENR
April 6, 2000
Re: DPM of the Carolinas, HWY 29/601
Unauthorized Stream Impacts
Cabarrus County
DWQ # 000034
Please refer to the previous correspondence from this Office dated April 6, 2000. In that letter this Office
requested stream mitigation as well as stormwater management plans within 30 days of receipt of the
correspondence. Mr. Michael Iagnocco of LawGibb subsequently requested an extension of the above
deadline pending the release of our new stream mitigation policy. This policy was signed into effect on
May 10, 2000. The policy can be dowloaded from our web site from the following address:
http://h2o.ehnr.state.nc.us/ncwetlands/strmmito.htm. As such we are requesting that stream mitigation and
stormwater management plans be submitted by August 11, 2000. This Office is very concerned regarding
the amount of time it is taking to resolve these matters. As such, no further deadline extensions will be
granted. Failure to provide these plans will prolong the current violations of which you were notified in a
Notice of Violation dated January 29, 1999 by the Division's Mooresville Regional Office.
Please be advised that nothing in this correspondence should be construed as limiting the Division.from
pursuing enforcement action for the above mentioned violations at any time.
Again, we a re requesting that a stream mitigation plan as well as a stormwater management plan that meet
the requirements specified in our April 6, 2000 correspondence be submitted by August 11, 2000 in order
to prevent your 401 Water Quality Certification application from being returned as incomplete.
4401 Reedy Creek Road, Raleigh, NC 27607 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper
Apr 6 '00 8:37 P.02/03
;State of'North Cprollha.
Department'.of 6nvironrnent
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
January 29, 1999
CERTIFIED MAIL
RETURN RECEIPT REQUESTEII ;
Mr. Todd H. Dickens
DPM of the Carolinas
80 Spring .Street, SW
Concord, North Carolina 28025
SUBJEC : UNAUTHORIZED STREAM IMPACTS
OPM of the Carolinas
DPM Project located on Hwy 291601
Cabarrus County
Dear Mr. Dickens:
Om January 12, 1999 Mr. Samar:Bou-Ghazale from the Mooresville Regional
Office of the Division of Water Quality (DWQ) conducted an inspection at the subject
site. During the inspection, DWQ staff documented an unauthorized stream impact to an
unnamed tributary to Irish BO alo .Creek, which is classified as Class C waters.
Specifically, the inspector noted that approximately 200 feet of stream have been
relocated and ripped-rapped without obtaining a permit.; These activities require a
Section 404 Permit from the U.S. Army Corps ofEnginccrs (USACOE) and also require
a Section 401 Water Quality Certification from DWQ. No authorization for these stream
and wetland impacts has been issued. Therefore, we believe that you are in violation of
Section 301 of the Federal Clean Water Act. In addition, you are in violation of North
Carolina Administrative Code' 15A 2H .0500, which requires application to DWQ for
appropriate certification. U.S.:Army Corps of Engineers staff will confirm violations of
Federal Law (call your County VSACOE representative to arrange an inspection).
Please respond to this Notice of Violation within 21 days of receipt. Your
response should address why these unauthorized impacts occurred and what restorative
measures will be implemented to bring this project into compliance. Failure to respond
Wetlandd401 Unit 4401 Reedy Creek Road I Raleigh. North Carolina 27607
-rgIlephone.919-733-1786 ! FAX # [phone]
An Equal opportunity Affirmative Action Employer i SNo recycled/Me post consumer paper
i
NORTH CAROLINA DXPARTMENT OF
ENVIRONMENT AND N<WURAL REZOU11CC3
v?rl? A
mAr-
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21

L

Mr. Todd H. Dickens
DPMProject Located on AWT 291601
Notice Of Violation
Page 2
Apr 6 '00 8:38 P.03/03
to this Notice of Violation or. to adequately address these unauthorized activities may
result in an enforcement action beir4 recommended against you. In addition, stream
mitigation may be required by DWQ for these impacts.
If you should have any further questions regarding this matter, please contact Mr.
Samar Bou-Ghazale at 704-663-1.699.
Sincerely,
D.Aex 01cason, P.E.
Regional Water Quality Supervisor
CC: Eric Fleek-NCDWQ Central Office
Steve Chapin, USACOE-(Aslrev9t,-):Field Office
Kathy Matthews, USEPA
Apr 6 '00 8:31 P.01/03
. North Carolina Department of
Environment and 'Natural Resources
(Mooresville Regional Office
. E ? o t>r:.-::. h:air, Street
'Mooresville, North Carolina 28116
Phone; 704/66.3-16!39
Fax-, 704/665-5D40
From: s?r1,9k' c),j_. LO
Division: ici?
Section Gv -- - -
]ate: - - 7 a
To: '7 aA/
`ax Number-TA-W3 Number of pages (including cover):
' L ??v? / i .r / J G
Apr 6 '00 8:32 P.02i03
State of.North Carolina
Department of ?.ironr
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor'
Wayne McDevitt, S6cretary
A. Preston Howard, Jr., P.E.,Director
January 29, 1999
CT
U TED
Mr, Todd H, Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, North Carolina 28025
SUBJECT: UNAUTHORIZED STREAM IMPACTS
DPM of the Carolinas
DPM Project located on Hwy 291601
Cabarrus County
Dear Mr. Dickens:
On January 12, 1999 Mr.:Samar Bou-(Jhazale from the Mooresville Regional
Office of the Division, of Water Quahty (DWQ) conducted' an inspection at the subject
site. During the inspection, DWQ staff documented an unauthorized stream impact to an
unnamed tributary to Irish B4TO10 Creek, which is classified as Class C waters.
Specifically, the inspector noted thatt approximately 200 feet of streams have been
relocated and ripped-rapped without obtaining a permit. These activities require a
Section 404 Pemtit from the CJ.S. Array Corps of Engineers (USACOE) and also require
a Section 401 Water Quality Certi cation from DWQ. No authorization for these stream
and wetland impacts has been issued. Therefore, we believe that you are in violation of
Section 301 of the Federal Clean Water Act. In addition, you are in violation of North
Carolina Administrative Code 15A:2R .©500, which requires application to DWQ for
appropriate certification . U.S. Army Corps of Engineers staff will confirm violations of
Federal Law (call your County USACOJ representative to arrange an inspection).
r
Please respond to this Notice of Violation within 21 days of receipt. Your
response should address why these unauthorized impacts occurred and what restorative
measures will be implemented to bring this project into compliance Failure to respond
wctlanda/401 Unit 4401 Reedy Cre01c
Tl Raleigh, North Carolina 27607
etephvkc 919-733-1486 Road
An Equal OppoMmity Ah FAX II 733.9959
Irmuivt Aotion Employer 50% "clod/100% post conewner paper
NORTH CAROLINA DEPURTMENT OF
ENVIRONMENT AND NATUPtAL REsOURCEE
Apr 6 '00 8:32 P.03i03
Mr. Todd H. Dickens
DPMP%jtct Locate on Hwy 391601
Notice of Violation
Page 2
to this Notice of Violation and adeggately address these unauthorized activities may
result in an enforcement action ing recomme4ded against you. In addition, stream
mitigation may be required by DWQ for these impacts,
If you should have anyfu?thar questions ,regard;n this matter, please contact Mr.
Samar Bou-Ghazale at.704-6611' 699.
Sincerely,
D. Rex Gleason, P.E.
R410nat Water Quality Supervisor
Cc: Eric Fleck-.NCDWQ Ccntral Office
Steve Chapin, USACOE--(6hevi/4) Field Office
Kathy Matthews, USEPA '
MAR 29 2000 15:42 FR LAW ENGINEERING 3578638 TO 19197339959 P.01i02
LAW
LAWGIBB Group Member
FACSIMILE TRANSMITTAL SHEET
LAW ENGINEERING & ENVIRONMENTAL SERVICES, INC.
2801 Yorkmount Road, Suite 100, Charlotte, NC 28208
Phone: [phone] Fax: [phone]
To _Mr. Todd St. John From: Marv C._MwM
Company: DWO Date transmitted:-March 29, 2000
Fax Number: 919-733-9959 Telephone:[phone]
Subject:-Mgp for v2ur review Fax Number:704-357-8638
No. Pages transmitted (inel. cover) 2 Hard Copy to Follow: Yes No X
CC:
Urgent - For Review X Please Comment _ Please Reply _ Please Recycle _
COMMENTS:
S4dd,-ifyou have any augWons, Rlease feel free to cRU me at 704--157-8600,
Thank "You!
CA_NMIC1V'I'??1.IT !!M- This Message Is Intended only for the use of the individual or entity to wbioh it is addressed, and
may con?em maonna? that is privilogod, oonfidentlal, and exempt $om disclosure under applicable Iaw. It We reader of this message
Is not doe Intended reelpient, or the employee or agent respoasibic for deiiveried the mwsw to the intended rooiplem, you No hereby
notified flat any dissemination, d19dbudon, or cw ft of this cotmnunica ion is strictly prohibited. If you have received this
communication in error, Pieria notify us immediately by telephonc and return the original Messer to us at the above addsees via the
U.S. Postal Servlee. 7ttanltyou.
If transmission is not received In good order, please call
MAR 29 2000 15:42 FR LAW ENGINEERING 3578638 TO 19197339959 P.02i02
DPM - 371 Concord Pk North
1 tChalfunt
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73
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I
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Wed Mar 2g 14:57 2000
1 Scale 1:31,250 (at center)
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I Local Road
S US Highway !
Interstate/Limited Access
State Route
? Exit tins
! Utility/Pipe
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A . Ipp2$(8t.ne.
Pro
** TOTAL PAGE.02 **
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
Mr. Todd Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, NC 28025
Dear Mr. Dickens:
1 ? •
Alnlft 000%
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
March 8, 2000
DWQ # 000034
Cabarrus County
On February 22, 2000 the Division of Water Quality (DWQ) wrote your consultant
concerning your plan to fill wetland for the purpose of clarifing deficiencies in the stream
mitigation plain for your project (DPM of Carolinas US Hwy 291601 site) in Cabarrus County.
Please call me at 919-733-1786 if you have any questions or would require copies of our
rules or procedural materials. To date we have not received a response to pour letter. This project
will remain on hold as incomplete in accordance with 15A NCAC 2H.0502(c). The processing
time for this application will begin when this information is received.
ce el
o R. orney
cc: Samiar Bou-Ghazale DWQ Regional Office
File Copy
Central Files
Mike Iagnocci; Law Engineers & Environmental
Wetlands/401 Unit 4401 Reedy Creek Road Raleigh, North Carolina 27607
Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer
50% recycled/ 10% post consumer paper
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
AWW"
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
March 7, 2000
DWQ # 000034
Cabarrus County
Mr. Todd Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, NC 28025
Dear Mr. Dickens:
On February 22, 2000 the Division of Water Q ?defiitcyie (Dwr ote your consultant
concerning your plan to fill wetland for the purpose of ncies in the stream mitigation plain
for your project (DPM of Carolinas US Hwy 291601 site) in Cabarrus County.
Please call me at 919-733-1786 if you have any questions or would require copies of our
rules or procedural materials. To date we have not received a response to pour letter. This project
will remain on hold as incomplete in accordance with 15A NCAC 2H.0502(c). The processing
time for this application will begin when this information is received.
Si rely,
Joh r-
. rney
cc: Samiar Bou-Ghazale DWQ Regional Office
File Copy
Central Files
Mike Iagnocci; Law Engineers & Environmental
Wetlands/401 Unit 4401 Reedy Creek Road Raleigh, North Carolina 27607
Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer
50% recycled/10% post consumer paper
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
1 • •
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
22 February, 2000
Mr. Michael A. Iagnocco
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Regarding: DPM of the Carolinas
Cabarrus County
DWQ # 000034
Dear Mr. Iagnocco,
Thank you for the stream mitigation plan for the UT of Irish Buffalo Creek in Cabarrus
County. This is an After-the-Fact mitigation for unauthorized activity consisting of the
relocation of approximately 270 linear feet of this unnamed tributary. We agree with the
intent and specifications of the mitigation plan; however, it should be noted that this plan
does not constitute stream restoration as defined in DWQ General Certification 13 and 27.
Stream restoration is defined as the process of converting an unstable, altered or degraded stream corridor,
including adjacent riparian zone and floodprone areas to its natural or referenced, stable conditions
considering recent and future watershed conditions. This process also includes restoring the geomorphic
dimension, pattern and profile as well as biological and chemical integrity, including transport of water
and sediment produced by the stream's watershed in order to achieve dynamic equilibrium.
The UT to Irish Buffalo Creek appears to be a perennial system and would therefore
necessitate the plan either being redone as a stream restoration or payments made to the
Wetland Restoration Program for 350 linear feet of channel if they are willing to accept this
responsibility.
Sincerely,

Wetland I Unit 1621 Mail Service Center Raleigh, North Carolina 27699-1621
Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post consumer paper
Cc; Samar Bou-ghazale, Mooresville Regional Office
Central Files?c/
MEMORANDUM
TO: John Dorney Regional Contact:
Non-Discharge Branch WO Supervisor:
Date:
SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS
Facility Name DPM of the Carolinas US 29/601 Site
Project Number 00 0034
Recvd From APP
Received Date 1/11/00 Recvd By Region
Project Type re-engineering
Certificates
Permit Wetland Wetland Wetland Stream
Type Type Impact Score Index
26 Stream PT O N F 13-17-9-(
F-- F- DY ON F_
Mitigation Wetland
MitigationType Type Acres I
Samar Bou-ghazale
Rex Gleason
County Cabarrus
County2
Region
Mooresville
01 Stream Impacts (ft.) AL?
-
' C U)J
VV,0__?
Is Wetland Rating Sheet Attached? Q Y p N Did you request more info? Q Y QQ N
Have Project Changes/Conditions Been Discussed With Applicant? Q Y 0 N
Is Mitigation required? Q Y O N
Recommendation: Q Issue O Issue/Cond O Deny
Provided by Region: Latitude (ddmmss) 352427
Comments:
Longitude (ddmmss) 803636
cc: Regional Office
Central Office Page Number 1
Facility Name DPM of the Carolinas US 29/601 Site
Project Number 00 0034
Comments (continued from page 1):
County Cabarrus
Regional Contact: Samar Bou-ghazale
Date:
cc: Regional Office Page Number 2
Central Office
LAW
ENGINEERING AND ENVIRONMENTAL SERVICES 000034C
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
2801 Yorkmont Road, Suite 100 Date: December 23, 1999 Project No.: 30100-9-4882
Charlotte NC, 28208 Project Name: DPM of the Carolinas US Highway 29/601 site
[phone] FAX [phone] Attention: John Dome
Re: After-ui,--Fact NWP No. 26 hl 'c loon
TO: Mr. John Dorney
Non-discharge Branch/Wetlands/401 Unit
1621 Mail Service Center
Raleigh, NC 27699-1621
y ,w
v i< r Y
AFC/' T
Fn
LETTER OF TRANSMITTAL
WE ARE SENDING YOU X Attached Under separate cover via t?`?Qll wir
Prints Plans Samples Specifications
Copy of letter Change order Other
IF ENCLOSURES ARE NOT AS NOTED, KINDLY NOTIFY US AT ONCE
COPIES DATE NO. DESCRIPTION
7 12/23/99 1 After-the-Fact NWP No. 26 Application
THESE ARE TRANSMITTED as checked below:
__X _For approval _ Approved as submitted
_ For your use _ Approved as noted
_ As requested Returned for corrections
For review and comment
_ Resubmit
_ Submit _
Return
copies for approval
_ copies for distribution
corrected prints
REMARKS: Law Engineering _ and Environmental Services, Inc. is submitting the necessary documentation for the after
the fact Nationwide Permit (NWP) No. 26 permit (and DWQ processing check) for the DPM of the Carolinas US
Highway 29/601 site. Please contact Michael A. Iagnocco at (704)-357-8600, if you have any questions regarding this
information.
RESPECTFULLY SUBMITTED,
W ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
Michael A. Iagnco V
Senior Environm tal Scientist
Copy To:
Allen W. Conger, P.W.S.
Principal
Envi onmental Scientist
uy ao .,,,._With Permission
1

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t

s

1

11

LAW
LAWGIBB Group ember
December 23, 1999
Mr. Steve Chapin
U.S. Army Corps of Engineers
Regulatory Branch
151 Patton Avenue, Rm. 143
Asheville, NC 28801-5006
Subject: After-the-Fact Nationwide Permit No. 26 Application
U.S. Highway 29/601 Office Building Site
Concord, North Carolina
LAW Project No. 30100-9-4882
USACE Action ID: 199930611
Dear Mr. Chapin:

P4Ne/vT
REcE?VtD
On behalf of DPM of the Carolinas (DPM) enclosed please find a completed Joint Form (Attachment
A) with accompanying figures for an after-the-fact Nationwide Permit No. 26 application in the
above-referenced matter. DPM has retained Law Engineering and Environmental Services, Inc.
(LAW) to provide stream channel restoration services for this project and to act as its agent in this
matter. An executed `Agent Certification of Authorization' form is enclosed (Attachment B). The
proposed U.S. Highway 29/601 Office Building site is located along the west side of U.S. 29/601 just
north of the U.S. 29/601 intersection in Concord, North Carolina (Attachment C, Figure 1). `lie
? 1C sN.-re4d ie-d DPM submit an application` dr-W `'after=tlie=fact permit` stream`
tigat aialrest atran lan r he nrtauth r zed relocation of appi bxrri ately 270--iinear-feet,,of streann...,
channe&(AlLcsh en W). Since the project's impacts total more than 150 linear feet of an above-the-
headwaters stream, this application and mitigation plan are being provided in accordance with the
Wilmington District's regional conditions for Nationwide Permit No. 26.
BACKGROUND
located immediately north of an existing laser tag facility (Jubilation Jungle). LAW was contracted by
The DPM of the Carolinas (DPM) property encompasses approximately 7.0 acres. The subject site is
Mansour Edlin Consultanting, Inc. (MEC) to conduct a preliminary wetlands review at the site prior to
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road • Charlotte, NC 28208
704-357-8600 • Fax: [phone]
1
1

I

A

After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
the development of the site. An approximate 10,000 square foot office building was recently
constructed on the subject property. A Notification of Unauthorized Activity/Permit Noncompliance
of tt e xelacat q of appmximately.2.70 linear feet of an. unnamed ributary Irish BuOalo Creek 'The
Ea '
relocation took place in the fall of 1998. The revised construction drawing plan entitled, "Drainage and
dated March 19, 1999 was issued by the USACE (Attachment E).
Erosion Control Plan" provided by MEC and Carlos Moore Architects dated, April 29, 1998, specified
the relocation of approximately 130 linear feet (Attachment C, Figure 2). The above-mentioned site
plan also included a realignment of a sanitary sewer line that involved two stream crossings. The stream
and sewer relocation were unavoidable in order to accommodate the 2:1 fill slopes associated with the
construction of the 10,000-square foot office building. Sediment and erosion control measures
implemented during building construction included a network of silt fence, rock check dams, and
sediment basins. Sediment basins were converted to pen. nanent storm water detention basins following
stabilization of the site to facilitate long-term storm water management. The grading contractor, in
charge of executing the construction plan, Mstraightened approximately 270 linear feet (If) of channel
instead of the proposed aproximately 130 if specified on the site plan. The relocated/straightened
channel totals approximately 230 if in length with 3:1 bank slopes. The relocation has resulted in a loss
of approximately 40 if of stream channel. During the construction process, stream flow was directed into
the relocated channel prior to stabilization. Consequently, in-stream conditions warranted the placement
of riprap fill and filter fabric into approximately 350 if of channel to stabilize erosion. The contractor/
DPM indicated that these stabilization activities were performed as directed by a representative of the
Cabarrus County Erosion Control (CCEC). To facilitate riprap placement, CCEC also advised that the
remaining streamside vegetation be removed.
As part of the Notification of Unauthorized Activity, the USACE has requested an application for an
after-the-fact permit for the aforementioned unauthorized activities, which must include an acceptable
stream mitigation/restoration plan. In effort to resolve this issue, DPM executed a contract with LAW in
August 1999 to provide Section 404 permitting and stream mitigation and restoration services. LAW
environmental scientists visited the site on August 25, 1999 to assess the conditions of the relocated
channel.
2
After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
CURRENT CONDITIONS
Jurisdictional waters of the U.S. in the project area include above-the-headwaters portions of an
unnamed tributary to Irish Buffalo Creek. These waters are part of the Yadkin Pee Dee River Basin
and are classified by the North Carolina Department of the Environment and Natural Resources -
Division of Water Quality (DWQ) as Class C freshwaters. The site is located in an area dominated by
the Cullen-Cecil-Hiwassee general soil association. This includes gently sloping to strongly sloping,
well drained soils that have a clayey subsoil; formed in residuum from acidic and mixed acidic and
basic crystalline rock. The soil series associated with the stream are Chewacla (Ch) sandy loam,
frequently flooded. Surrounding upland soils consist of Enon (EnD) sandy loam, 8-15 percent slopes
(Attachment C, Figure 3, USDA Soil Survey Cabarrus County, NC, 1988.) The drainage basin of the
stream is approximately 0.3 square miles.
This undisturbed portion of the unnamed tributary has four to six foot average channel bottom widths
and a less than four-inch normal water depth (Attachment D - Photograph B). The vegetation
1 growing in and around the original channel, immediately up stream of the relocated section, consists
of coneflower (Rudbeckia laciniata), jewel-weed (Impatiens capensis), tearthumb (Polygonatum
sagittatum), false loosestrife (Ludwigia peploides), black willow (Salix nigra), and soft rush (Juncus
effusus).
1 The stream substrate upstream of the relocated portion of the channel is primarily composed of coarse
sand, cobble, and bedrock (Attachment D - Photograph A). Riparian vegetation growing along
undisturbed portions of channel consisted of sweet-gum (Liquidambar styraciflua), sycamore
(Platanus occidentalis) and red maple (Ater rubrum). This unnamed tributary is apparently sustained
by a combination of groundwater flow and precipitation. Undisturbed segments of the channel show
signs of bank instability (Attachment D - Photograph D).
Plants identified along the original undisturbed channel are also establishing themselves along the
banks of the relocated channel (Attachment D - Photograph E). Portions of the relocated channel are
also characterized by similar stream substrate to the undisturbed upstream channel (Attachment D -
Photograph B). TJVWALVML clr rmel appears to be stabilizing;; as evidenced by'several p-oint bar'

After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAWProject 30100-9-4882
deposits (sandbars) noted during field reconnaissance. The northwestern bank of the stream channel is
wooded with steep slopes.
Field observations of functional significance included wildlife tracks in the channel, channel substrate
(bedrock, coarse sand, and cobble), the presence of fish er ' ow. Based on guidance
provided by the USACE, the on-site portions of this above-the-headwaters stream are concluded to be
providing important aquatic function. DWQ requires mitigation for projects with impacts to greater
than 150 linear feet (If) of stream channel if aquatic vertebrates and large invertebrates are present
which require continuous water (i.e., fish, crayfish, clams/mussels or bullfrog tadpoles [which usually
require at least two years to mature]) ^*?rP * a c impacted by the relocation and
`,. ., .
' -
rr n ta?T1`ll'?TY1tiW as, concluded to be functionally significant-and,-perennial in accordance
th,L? W?,frn?floti.
PROPOSED PLAN
DPM proposes to mitigate the inadvertent impact to ..w ; JA of stream channel (combined 270 if o
relocated channel and 80 if of riprap) though the elect rerno?Aof.riprap? from the channel bottom and
the IMM- 'cif 1-* ;en`=iiieering. techniques to permanently stal ilize the banks-0of the relocated
channel. The portion of the stream channel immediately upstream of the culvert flowing beneath U.S.
Hwy 29/601 is currently overgrown with kudzu (Pueraria lobata). This invasive plant will be
eradicated/controlled to allow for the plantings associated with the bioengineering techniques to be
successful. A detailed stream mitigation/restoration plan is attached as Attachment F.

G
F.

After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT A
JOINT FORM - NATIONWIDE PERMIT No. 26

' DEM ID: CORPS ACTION ID: 199930611
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #): 26 (After-th6 Ease
PRE-CONSTRUCTION NOTIFICATION APPLICATION
FOR NATIONWIDE PERMITS THAT REQUIRE:>
1) NOTIFICATION TO THE CORPS OF ENGINEERS,
2) APPLICATION FOR SECTION 401 CERTIFICATION'
3) COORDINATION WITH THE N.C. DIVISION OF COASTAL MANAGEMENT
' SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD
OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (7) COPIES
SHOULD BE SENT TO THE N.C. DIVISION OF WATER QUALITY (SEE AGENCY ADDRESSES
SHEET). PLEASE PRINT.
1. OWNERS NAME: DPM of the Carolinas
2. MAILING ADDRESS: 80 Spring Street, S.W.
SUBDIVISION NAME: N/A
CITY: Concord STATE: NC ZIP CODE: 28025
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE): The U.S. Highway 29/601 Office Building and associated stream
relocation site is located at 371 Concord Parkway North (U.S. 29/601) along the west side of the
highway just north of the U.S. 29/601 intersection/function in Concord, North Carolina.
POC: Todd H. Dickens
TELEPHONE N
3. UMBER (HOME):. N/A (WORK): [phone]
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER: LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100, Charlotte, NC 28208
POC: Mr. Michael A. Iagnocco, Senior Environmental Scientist
4a. TELEPHONE NUMBER (WORK): [phone] Ext. 5543 (FAX): [phone]
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC
MAP OR AERIAL PHOTOGRAPHY WITH SCALE): (See Figure 1)
COUNTY: Cabarrus NEAREST TOWN OR CITY: Concord
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ETC The U.S. Highway
29/601 Office Building and associated stream relocation site is located at 371 Concord Parkway
North (U.S. 29/601) along the west side of the highwU just north of the U.S. 29/601 intersection in
Concord, North Carolina.

6. IMPACTED OR NEAREST STREAM/RIVER: Unnamed tributary of Irish Buffalo Creek
RIVER BASIN: Yadkin PeeDee
7a. IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER (SA),
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-II)? YES ? NO ® IF YES, EXPLAIN: Class C Freshwater
7b. IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES ?NO
7c. IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION?
N.A.
8a. HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PROPERTY? YES ?NO ® IF Y ES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS
r PERMIT AND ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401
CERTIFICATION):
8b. ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE?
YES ?NO ® IF YES, DESCRIBE ANTICIPATED WORK:
' 9a. ESTIMATED TOTAL NUMBER OF ACRES IN TRACT OF LAND: Approximately seven acres.
9b. ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
N.A.
10a. NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: 0.0
EXCAVATION: 0
FLOODING: 0 OTHER: 0
DRAINAGE: 0 TOTAL ACRES TO BE IMPACTED: 0.0
IOb. (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF
RELOCATED, PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION:
LENGTH BEFORE: 270 LINEAR FT. AFTER: 230 LINEAR FT.
a
WIDTH BEFORE (based on normal high water contours): Average width 4?6°F F
WIDTH AFTER: Average width 4-6 FT. (Relocated Channel)
2

ri

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r

L?

E
AVERAGE DEPTH BEFORE: unknown FT. AFTER: 0.3 FT. (Relocated Channel)
(2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: X
CHANNEL EXCAVATION:
PLACEMENT OF PIPE IN CHANNEL:
CONSTRUCTION OF A DAM/FLOODING:
OTHER: Placement of ripro along 350 If of channel
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TO THE POND? N/A
WHAT IS THE EXPECTED POND SURFACE AREA? N/A
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF
MECHANICAL EQUIPMENT TO BE USED (ATTACH PLANS: 8'/z" X 11" DRAWINGS
ONLY):
The unauthorized activity consisted of the relocation of approximately 270 linear feet and
placement of riprap along 350 If of an unnamed tributary to Irish Buffalo Creek. The relocation
took place in the fall of 1998. The revised construction drawing plan entitled, "Drainage and
Erosion Control Plan" provided by MEC and Carlos Moore Architects dated, April 29, 1998,
specified the relocation of approximately 130 linear feet (Attachment C Figure 2). The above-
mentioned site plan also included a realignment of a sanitary sewer line that involved two stream
crossings. The stream and sewer relocation were unavoidable in order to accommodate the 2:1
fill slopes associated with the construction of the 10,000-square foot office building. Sediment
and erosion control measures implemented during building construction included a network of
silt fence rock check dams and sediment basins. Sediment basins were converted to permanent-
storm water detention basins following stabilization of the site to facilitate long-term storm water
management
13. PURPOSE OF PROPOSED WORK:
The primary purpose of the project was the construction of a 10,000 square feet office building.
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT IN
WETLANDS. (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND IMPACTS):
Wetlands were not impacted by the project. The relocation of stream channel was unavoidable in
order to accommodate 2:1 fill slopes associated with construction of the 10,000 ft2 office building.
3

The grading contractor, in charge of executing the construction plan, straightened approximately
270 linear feet (if) of channel instead of the proposed approximately 130 if specified on the site
' plan The relocated/straightened channel totals approximately 2301f in length with 3:1 bank slopes.
The relocation has resulted in a loss of approximately 40 if of stream channel. During the
construction process stream flow was directed into the relocated channel prior to stabilization.
Consequently, in-stream conditions warranted the placement of riprap and filter fabric into
approximately 350 if of channel to stabilize erosion.
a
15. YOU ARE REQUIRED TO CONTACT THE U.S. FISH AND WILDLIFE SERVICE (USFWS)
AND/OR NATIONAL MARINE FISHERIES SERVICE (NMFS) (SEE AGENCY ADDRESSES
SHEET) REGARDING THE PRESENCE OF ANY FEDERALLY LISTED OR PROPOSED FOR
LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL HABITAT IN THE
PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE
CONTACTED: 12/22/99 (ATTACH RESPONSES FROM THESE AGENCIES.)
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) (SEE AGENCY ADDRESSES SHEET) REGARDING THE PRESENCE OF HISTORIC
PROPERTIES IN THE PERMIT AREA WHICH MAY BE AFFECTED BY THE PROPOSED
PROJECT. DATE CONTACTED: 12/22/99
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OR THE USE OF
PUBLIC (STATE) LAND?
YES ? NO ® (IF NO, GO TO 18)
a. IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT?
YES ? NO
b. IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE?
YES ? NO ?
IF ANSWER TO 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE
STATE CLEARINGHOUSE TO DIVISION OF ENVIRONMENTAL MANAGEMENT
REGARDING COMPLIANCE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY
ACT.

QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED
' ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OR FILL MATERIAL INTO
WETLANDS:
' a. WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29
AND 38). ALL STREAMS (INTERMITTENT AND PERMANENT) ON THE PROPERTY
MUST BE SHOWN ON THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET
OR 1 INCH EQUALS 100 FEET OR THEIR EQUIVALENT. See Figure 2 - Attachment C
b. IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WATERS OF THE U.S. TO BE
IMPACTED BY PROJECT. (Attachment D)
c. IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE. N/A
d. ATTACH A COPY OF THE STORM WATER MANAGEMENT PLAN IF REQUIRED. N/A
e. WHAT IS LAND USE OF SURROUNDING PROPERTY? Commercial
f. IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A
g. SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
Attachment B.
NOTE: WETLANDS OR WATERS OF THE U.S. MAY NOT BE IMPACTED PRIOR TO:
1) ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2) EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF
ENVIRONMENTAL MANAGEMENT (WATER QUALITY) CERTIFICATION, AND
3) (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE
NORTH CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE
PROPOSED ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL
'
ak-1j, ) . //" MANAGEMENT PROGRAM.
1qz'3 I99
OWNER'S/AGE T' SIGNATURE DATE
' (AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED (18G.))

Ll

After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT B
AGENT AUTHORIZATION FORM
Completion of this
form willallow the ent tori n all=future a lication curres" ndence
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After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT C
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After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT D
PHOTOGRAPHS

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After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT E
NOTICE OF UNAUTHORIZED ACTIVITY

I Action ID: 199930611

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County: Cabarrus
Notification of Unauthorized Activity/Permit Noncompliance
Responsible Party: DPM of the Carolinas
Address: 80 Spring Street, S.W.
Concord, NC 28025
Telephone Number: [phone]
Size and Location of Property (waterbody, Highway name/number, town, etc.):
Hwy. 29 / 601 project in Concord.
Description of Unauthorized Activity/Permit Noncompliance:
Unauthorized relocation and riprap fill on approx. 300 LF of an unnamed tributary to Irish
Buffalo Creek.
Indicate which of the following apply:
X Unauthorized Activity River & Harbor Act, Section 10 (33 USC 403)
Noncompliance with Permit _ Clean Water Act, Section 301 (33 USC 131 1)
Unless you have a Department of the Army permit for the above-described activity, it is a violation of federal law as specified
above. You have agreed to do no further work m waters or wetlands without the required Department of the Army permit. Any further
unauthorized work in waters or wetlands will be considered an intentional violation of federal law.
If you do no further work in waters or wetlands, and perform the remedial action requested below, the Corps of Engineers will take
no further action in this matter. If you continue to work in waters and wetlands without the required authorization, and/or fail
to perform the requested remedial action, the Corps will take further administrative action, and may request U.S. Attorney to file
suit against you. If you need further information about the Corps of Engineers regulatory program, please contact
Steve Chapin at [phone] .
Remedial Action Requested:
Apply for an after-the-fact permit for the above unauthorized activity. The application must
include an acceptable mitigation / restoration plan for the tributary.
Your signature acknowledges receipt of this notification.
Property Owner/Responsible Party Signature
Project Manager Signature S
Date: March 19, 1999
cc: NCDENR - DWQ; Law Environmental
CESAW Form 607
1 OCT 12
U.S. ARMY CORPS OF ENGINEERS
WILMINGTON DISTRICT
Lei Zu 77 1J -V-. I . vi' v-

State of North 'Carolina:
Department of Environment
and Natural Resources
Division of Water Quality

James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
ENV,
CAROLINA DEPARTMENT OF
ENT AND NAruRAL REsouROES
January 29, 1999
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
Mr. Todd H. Dickens
DPM of the Carolinas
80 Spring Street, SW
Concord, North Carolina 28025
SUBJECT: UNAUTHOP4ZED STREAM IMPACTS
DPlvi of the Carolinas i•
DPM P '. ject located on Hwy 291607
' Cabarrus County :.
Dear bir. Dickens:
On January 12, 1999 Mr. Samar Bou-Ghazale frorni.the Mooresville Regional
Office of the Division of Water Quality.:(DWQ) conducted! an inspection at the subject
site. During the:inspection, DWQ staff documented an unauthorized stream impact to an
r unnamed tributary to Irish Buffalo Creek, which is elassih, ed as Class C waters.
Specifically, the inspector noted that approximately 200 feet of stream have been
and.ripped-rapped without obtaining a P:e mit. These activities require a
Section 404 Permit from the U.S. Army. Corps of Engineers (USACOE) and also require
a Section 401 Water Quality Certification from DWQ. No authorization for these stream
and wetland impacts has been issued. Therefore, we believe that you are in violation of
Section 301 of the Federal Clean Water Act. In addition, you are in violation of North
Carolina Administrative Code 15A 2H.0500, which requiies application to DWQ for
appropriate certification. U.S. Army Corps of Engineers staff will confirm violations of
Federal Law (call your County USA COE representative to arrange an inspection).
Please respond to this Notice of Violation within 2 days, of receipt. Your
response should address why these unauthorized impacts occurred and what restorative
measures will be implemented to bring this project into compliance. Failure to respond
Wetlands/401 Unit 4401 Reedy Crock Road Raleigh, North Carolina 27607
T elcphone 919-733-1796 FAX # [phone]
An ggwl opportunity Affismsave Action Employer 503'ye tecyeleW10•h post conmamor paper

Mr. Todd H. Dickens
DPM Projectl ocated on Hwy 291601
Notice of Violation
Page 2
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to this Notice, of Violation onto adequately. address these tuiauthorixed activities may
result in an enforcement aetion being recommended against you. In addition, stream
mitigation may be required by DWQ for these impacts.
If you should have any ifurther questions regarding phis matter, please contact Mr.
Samar Bou-Ghazale at 704-663-1699.
Sincerely,
n, Rex Gleason, P.E.
Regional Water Q.xlity Supervisor
Cc: 'Eric Fleek NCDWQ Central Office i
Steve Chapin, USACO.!(Asheville) Field Mice
Kathy Matthews, USEPA
After-the-Fact Nationwide Permit No. 26 Application - DPM of the Carolinas December 23, 1999
LAW Project 30100-9-4882
ATTACHMENT F
STREAM COMPENSATORY MITIGATION PLAN
COMPENSATORY STREAM MITIGATION PLAN
RELOCATED STREAM ENHANCEMENT
in the matter of
APPROXIMATE 270 LINEAR FEET OF RELOCATED CHANNEL
ONE MILE NORTH OF US HIGHWAY 291601
CABARRUS COUNTY, NORTH CAROLINA
Applicant:
DPM of the Carolinas
80 Spring Street, S. W.
Concord, NC 28025
Contact: Todd H. Dickens
[phone]
Authorized Agent:
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Contact. Mike Iagnocco
[phone]
LAW Project No. 30100-9-4882
December 22, 1999

COMPENSATORY STREAM MITIGATION PLAN
RELOCATED STREAM ENHANCEMENT
in the matter of
APPROXIMATE 270 LINEAR FEET OF RELOCATED CHANNEL
ONE MILE NORTH OF US HIGHWAY 291601
CABARRUS COUNTY, NORTH CAROLINA
Applicant:
DPM of the Carolinas
80 Spring Street, S. W.
Concord, NC 28025
Contact: Todd H. Dickens
[phone]
Authorized Agent:
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100
Charlotte, North Carolina 28208
Contact: Mike lagnocco
[phone]
LAW Project No. 30100-9-4882
December 22, 1999

TABLE OF CONTENTS
1.0 INTRODUCTION .................................................................................................................1
2.0 SITE DESCRIPTION ............................................................................................................1
3.0 STREAM ENHANCEMENT PLAN ....................................................................................4
3.1 Planting Techniques .............................................................................................................4
3.2 Ground Cover .......................................................................................................................4
3.3 General Guidelines for Plant Handling ................................................................................ 5
3.4 Bioengineering Techniques - Stream Bank Stabilization .....................................................5
3.5 In-Stream Measures ..............................................................................................................6
4.0 MONITORING PLAN .......................................................................................................... 7
4.1 Maintenance and Monitoring ............................................................................................... 7
4.2 Remedial Action ...................................................................................................................9
5.0 REFERENCES .......................................................................................................................9

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1.0 INTRODUCTION
In response to a letter dated January 21, 1999, from the USACE regarding unauthorized stream
relocation impacts to an unnamed tributary of Irish Buffalo Creek associated with the DPM of
The Carolinas U.S. Highway 29/601 project, the following stream relocation enhancement plan is
provided as part of the after-the-fact Nationwide No. 26 permit application.
Approximately 270 linear feet (If) of channel has been straightened resulting in the creation of
230 if of relocated channel. Riprap was placed in the bed and bank of this channel for
approximately 350 if as an erosion control measure. The following plan is proposed for
enhancement of the relocated channel.
2.0 SITE DESCRIPTION
The site is located in Cabarrus County less than one mile north of the U.S. Highway 29/601
intersection. Currently, approximately 870 if of the unnamed tributary flows northeast through
the property. The relocation involved an approximate 270 if segment of a perennial unnamed
tributary to Irish Buffalo Creek. The resultant relocated channel is approximately 230 if
reflecting a loss of 40 if of channel. A total of approximately 350 if (including the relocated
segment) of channel has been impacted by the placement of riprap and filter fabric along stream
banks and channel bottom.
The site is located in an area dominated by the Cullen-Cecil-Hiwassee general soil association.
This includes gently sloping to strongly sloping, well drained soils that have a clayey subsoil;
formed in residuum from acidic and mixed acidic and basic crystalline rock. The soil series
associated with the stream are Chewacla (Ch) sandy loam, frequently flooded. Surrounding
upland soils consist of Enon (EnD) sandy loam, 8-15 percent slopes (USDA Soil Survey Cabarrus
County, NC, 1988, Attachment C, Figure 3.)
Jurisdictional waters of the U.S. in the project area include above-the-headwaters portions of an
unnamed tributary to Irish Buffalo Creek. Jurisdicational waters are confined to the bed and bank
of the stream. The tributary is part of the Yadkin Pee Dee River Basin and is classified by the
North Carolina Department of the Environment and Natural Resources - Division of Water
Quality (DWQ) as Class C,freshwater. The stream is characterized on the United States
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DPM of the Carolinas -U.S. Highway 291601 Site December 22, 1999
Stream Relocation Enhancement Plan
Department of Interior Fish and Wildlife Services, National Wetlands Inventory (NWI) map,
Concord, NC 1995 as palustrine, forested, broad-leaved deciduous temporarily flooded (PFOIA).
2.1 Stream Characteristics
The channel slope along the on-site stream segment is less than one percent as measured from the
USGS 7.5 minute quadrangle topographic map, Concord, N.C. 1969, photorevised 1987. The
measurement was calculated based on an approximate change in elevation estimated at seven feet
divided by the current approximate stream length (870') across the site. The estimated drainage
basin of the stream is approximately 0.3 square miles.
The relocated portion of the unnamed tributary has a four to six foot average channel bottom
widths and a less than four-inch normal water depth (Attachment E - Photograph H). According
to the site plan, the channel design includes filter fabric covered by an 18" layer of Class 1 Riprap
along the toe of slope and channel bed. The design slope is 3:1 and channel bottom is
approximately 10' wide. The designed bankfull width and depth are specified as 14, feet and 4.5
feet, respectively. The floodplain depth of approximately nine feet is identified as approximately
equal to two times the design bankfull depth of 4.5 feet. The floodplain width associated with
the nine-foot floodplain depth is greater than 30 feet along the relocated segment of the channel.
The entrenchment ratio, determined by floodplain width (>30 feet) divided by design bankfull
width (14 feet), is greater than 2.2. In-accordance with the Dave Rosgen stream classification
method, the channel is stream type "C" and' is considered slightly entrenched (Rosgen, 1996.)
The design bankfull width to depth-ratio (14^feet/4.5 feet) is estimated as "3.11" and is considered
to be very low. The estimated sinuosity for the original channel is "1.2", determined as the
estimated length of the approximate Thalweg (970 feet) divided by the estimated length of the
valley (800 feet) for the distance associated with the on-site segment of the stream. The sinuosity
for the relocated channel is assumed to be slightly less than "1.2". The relocated channel
substrate consists primarily of riprap and course sand deposits. Upstream-undisturbed channel
segments consist of coarse sand, gravel, and bedrock.
At the time of LAW's site reconnaissance on August 25, 1999, portions of the channel upstream
of the disturbed area had similar vegetation and stream substrate to downstream disturbed
portions (Attachment D - Photograph E through H). The relocated and riprap-lined segments of
2

DPM of the Carolinas -U.S. Highway 291601 Site
Stream Relocation Enhancement Plan
December 22, 1999
the new channel appear to be naturalizing and progressing towards a state of dynamic
equilibrium. The bank is well-vegetated and several point bar deposits (sandbars) were noted
during field reconnaissance. 0
' The vegetation in the drainage slightly up-gradient of the relocated channel consists of
coneflower (Rudbeckia laciniata), jewel-weed (Impatiens capensis), tearthumb (Polygonatum
sagittatum), false loosestrife (Ludwigia peploides), black willow (Salix nigra), and soft rush
(Juncus effusus). These plants are voluntarily establishing themselves along the banks of the
' relocated channel (Attachment D - Photographs E through H).
' The west side of the channel upstream of the relocation is wooded with steep slopes. During field
reconnaissance signs of bank instability were observed upstream of the relocated channel
' (Attachment D - Photograph D). A sanitary sewer is located parallel to the stream channel in the
vicinity of the project. The channel course has previously been disturbed by the alignment of the
sanitary sewer. The riparian buffer in the vicinity of the sanitary sewer has also been disturbed
during the installation of the sanitary sewer and as part of the routine maintenance of the
' permanent right of way. The drainage and erosion control plan for the site identifies a
realignment of the sanitary sewer along the lower portion of the tributary. The realignment was
performed as a result of conflicts with the grading plan for the site. The realigned sewer crosses
' the tributary in two locations upstream and downstream of the relocated channel segment. .
. Undisturbed upstream portions of this unnamed tributary are relatively incised with banks
averaging four to six feet in height. The stream substrate upstream of the relocated portion of the
' channel is primarily composed of coarse sand, cobble, and bedrock (Attachment D - Photograph
A). Riparian vegetation growing along undisturbed portions of channel consisted of sweet-gum
' (Liquidambar styraciflua), sycamore (Platanus occidentalis) and red maple (Ater rubrum). This
unnamed tributary is apparently sustained by a combination of groundwater flow and runoff from
precipitation.
' Field observations of functional significance included wildlife tracks in the channel, channel
substrate (bedrock, coarse sand, and cobble), the presence of fis ased on
' guidance provided by the USACE, the on-site portions of this above-the-headwaters stream are
concluded to be providing important aquatic function.
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DPM of the Carolinas -U.S. Highway 291601 Site
Stream Relocation Enhancement Plan
December 22, 1999
present which require continuous water (i.e., fish, crayfish, clams/mussels or bullfrog tadpoles
[which usually require at least two years to mature]). The entire stream channel impacted by the ??
relocation and placement of fill (riprap) was concluded to be functionally significant and meet
DWQ's definition of perennial.
3.0 STREAM ENHANCEMENT PLAN
The restoration will involve a variety of techniques to provide stabilization and promote the
establishment of improved aquatic habitat. These techniques include plantings, bioengineering,
and in-stream measures.
3.1 des
Hydrophytic vegetation currently present on-site will be used in connection with bioengineering
techniques for bank stabilization. Dormant cuttings, bare root, containerized plants, and seeds of
native wetland species will be supplied from a local nursery or locally harvested to insure
acclimation and native status. Nonnative and weedy species will not be used in this planting plan.
Soil bioengineering techniques will include live staking and fascine installation. Bioengineering
will optimally take place during plant dormancy, i.e., fall through early spring. All of the plant
species chosen have exhibited past success in local bioengineering projects and will provide food
and cover for wildlife. Some plants will be chosen on the bases of their high tolerance for
flooding and others for their ability to furnish food for wildlife (Table 1). Plants will be planted
on the basis of topography, flood tolerance, and existing hydrophytic vegetation density. Areas
subjected to erosion will be covered with erosion control fabric and seeded with a mixture of
native grasses to help reduce surface erosion.
3.2: , .
DWQ's Stormwater Best Management Practices Manual, (NCDENR, 1995) suggests the use of
bluejoint (Andropogon gerardi) and Switch grass (Panicum virgatum) as examples of native
species used as herbaceous ground cover. Native status, resistance to flooding, establishment
rate, and past success rates of each species will be considered in the selection of ground cover
species. Areas that are disturbed during construction will be planted with appropriate ground
cover and covered with erosion control fabric.
4
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DPM of the Carolinas -U.S. Highway 291601 Site
Stream Relocation Enhancement Plan
December 22, 1999
1 3.3 General Guidelines for Plant Handling

I

• Plant cuttings and roots must be kept moist at all times to insure their vitality.
• Care should be taken to insure that biotic materials are not mishandled or broken.
• Plant materials should be used as soon as possible after arriving on-site.
• If leaves are still on the stems when harvested, they should be removed before live
stacking.
• Specific requirements for ground cover and tree planting densities will follow
guidance contained in Stormwater BMPs for creation of bioretention areas-
(NCDEHNR, 1995).
3.4 Bioengineering Techniques - Stream Bank Stabilization
Two main bioengineering methods to be employed on the stream relocation include, "live
staking" and "fascines". Live staking involves the insertion of dormant stem cuttings into the soil
at a depth of six inches or greater. Silky dogwood (Corpus amomum) is growing on site and is a
good candidate for live staking into fine textured soils. Black willow (Salix nigra) is another
good candidate for staking, with rapid rooting and tolerance of a wide range of moisture
conditions. Density for live staking will be approximately 1.5 feet on center. Species more
resistant to flooding will be placed towards the toe of the slope (Table 2). Eradication of kudzu
will be required to prevent interference with the survival of livestake material. Eradication will
be performed using manual techniques (e.g., mowing and spot application of herbicides).
A fascine is a "bundle of cut branches" which are tied together with twine. Fascines are normally
about ten to twenty feet long and six inches in diameter. They are constructed of harvested plant
materials which are cut into five foot long sticks. These sticks are combined with inert materials
and other materials not likely to root to allow space for root growth and assist initial bank
stabilization. These bundles are then staked into a previously excavated trench and secured with
wooden stakes. Fascines are generally used to stabilize lower sections of a stream bank. Use of
fascines result in the creation of a densely covered and stable area.
1

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DPM of the Carolinas -U.S. Highway 291601 Site December 22, 1999
Stream Relocation Enhancement Plan
3.5 In-Stream Measures
, s. ill inclucferytlie "eleet i6il6'a" is ptil l tmbfriprapIfr6i i t 't ant=el
bottom to cr t han ed`habitat died promote iibpro??c iv?r?c?ua?itq along t?? acted 35O:.lf
ckn?Sl scgtn U Excess riprap along the channel banks (i.e., above bankfull stage) will be
removed and replaced with bioengineering measures including fascines or lives stakes as
appropriate. Fascines will be placed in the bank along the upper edge of the riprap zone. In-
stream measures will be located as appropriate in areas where natural fluvial geomorphic
processes are already encouraging re-establishment of habitat. Final design considerations will
include the minimization of conflicts with the sanitary sewer and will limit impacts to adjacent
channel segments. Slope and riparian shoreline disturbed during installation of enhancement
features will be reshaped and re-seeded as needed.
Pool areas will be created through installation of water impounding structures such as step pool
structures, boulder clusters, modified wedge dams, or single wing deflectors (See attached figures
approximately 85 feet are anticipated.
for details). Pool encouragement features will be spaced at appropriate- intervals approximately
equal to six times the bankfull width. No more than four instream structures 'spaced at
Additional habitat enhancement will be conducted as water flow establishes riffle, run, and pool
habitat after enhancement features are in place. At that time stream morphology will be carefully
evaluated, and if necessary, actions will be taken such as reconfiguration of the habitat
enhancement structures.
Emergent aquatic species will be planted immediately beside the streambed and along the edges
of created pool areas and woody tree and shrubs will be planted on sideslopes above the channel.
See Tables 1 and 2 for plant list. Plants will be either harvested locally or purchased from a local
nursery. The herbaceous species along the channel will encourage natural stabilization as an
alternative to riprap and will provide in-stream cover for both fish and benthic macro-
invertebrates in a relatively short timeframe. The trees and shrubs along the sideslopes of the
stream will create more substantial and complete stream canopy cover and a corridor of wildlife
habitat along the relocated channel.
6
7
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DPM of the Carolinas -U.S. Highway 291601 Site December 22, 1999
Stream Relocation Enhancement Plan
4.0 MONITORING PLAN
4.1 Maintenance and Monitoring
Monitoring of the planted vegetation and in-stream features of the relocated channel will include
a biannual visit, once during the fall and again in the spring. These visits will include monitoring
survival rates, percent cover, growth, and species diversity. Annual monitoring reports to the
USACE and to DWQ (in duplicate) will be provided. The established success criterion of 0
percent areal coverage of herbaceous vegetation in areas outside of the channel, and 50 percent
' areal coverage of woody plants in areas outside of the channel at the end of the monitoring
period, must be met in order to eliminate further monitoring requirements. The upstream segment
will be used as a reference site as well as a baseline study of the on-site enhancement area and the
identification of permanent sampling plots to observe re-establishment success. Reference
information for the monitoring success of the relocated channel will be taken from field notes and
photographs of the up-gradient system.
In-stream enhancement features will be inspected for maintenance needs. Planted areas will be
observed and evaluated for remedial solutions including replacement, modification, and no action
alternatives. The mitigation stream channel area will be evaluated and will be characterized by
segment, habitat type, perceived stability, and linear footage.
Vegetative monitoring will involve the establishment of transects along the riparian buffer. A
map of the mitigation area with the location and size of each transect will be provided. Sample
plots along each transect will be permanently marked in the field with semi-permanent survey
stakes and surveyor's flagging. The location of the sample plots will be determined based on
topography and inundation frequency and randomly placed along each transect. Transects will
run perpendicular to the stream flow in the relocated stream channel Trees, vines, and shrubs
will generally be monitored in II -foot radius circular plots, with herbaceous vegetation being
monitored within 3.28 ft by 3.28 ft square plots. At least four plots for woody cover and ten plots
for herbaceous cover will be monitored. All species are to be identified and the number of stems
surviving and percent area cover will be recorded for each plot. Live stakes will be examined for
viability, and vigor will be recorded as good, fair, poor, or dead.
Photo-monitoring will also be conducted at selected locations including cross sections at the
locations of in-stream features as well as along transects to document success over time.

DPM of the Carolinas -U.S. Highway 291601 Site December 22, 1999
Stream Relocation Enhancement Plan

Monitoring events will include:
1. Random recording of density and species diversity of plants within plots
along transects. This usually involves a random sampling of a larger
designated area through the use of a fixed sampling apparatus.
2. Monitoring of future canopy population by measurement of DBH, and
general health of planted trees.
2. Recording the viability and vigor for livestakes.
3. All data will be recorded on a standardized form and attached to USACE and
DWQ reports.
4. The percent areal cover of herbaceous and woody plants will be recorded
(USFWS, 1988).
5. Recent climatological data will be recorded.
6. Photo-monitoring of the site will occur at the same time as physical
monitoring and will include an on-site reference within each photograph.
4.2 Remedial Action
The applicant, DPM of the Carolinas, is committed to the design and implementation of a
successful on-site mitigation program. The applicant is hereby committed to taking necessary
remedial action if the mitigation efforts do not achieve pre-established success criteria. Remedial
activities may include replanting of areas, manipulation of hydrology, the identification of a
reference site for the comparison to similar headwater systems within the Piedmont region, or
discussions with involved parties regarding alternative solutions. One copy of all photos, data
forms, and maps of specific transects being monitored will be sent to the USACE and DWQ.
After three years, if the mitigation site has not met the minimum success criteria, then additional
measures for mitigation maybe discussed.

DPM of the Carolinas. -U.S. Highway 291601 Site December 22, 1999
Stream Relocation Enhancement Plan
5.0 REFERENCES
North Carolina Department of Environment, Health, and Natural Resources, Division
(NCDEHNR) of Environmental Management, Water Quality Section. November, 1995.
Stormwater Best Management Practices. Raleigh, NC.
i
NCDE14NR, Division of Environmental Management. June, 1994. A Field Guide to North
Carolina Wetlands. Raleigh, NC.
North Carolina Wildlife Resources Commission. January, 1999. Habitat Conservation Program
Division of Inland Fisheries. Draft Guidelines for Stream Relocation and Restoration in
North Carolina.
Mellichamp, T.L., J.F. Matthews, and M.C. Murray. 1996. Selection and Planting- Guide for
Aquatic and Wetland Plants in the Piedmont Region of North Carolina. H.A.R.P., U.N.C.
at Charlotte, NC.
Radford, A.E., H.E. Ahles, and C.R. Bell, 1968. Manual of Vascular Flora of the Carolinas. The
University of North Carolina Press. Chapel Hill, N.C. 1,183 pp.
Rosgen, David, D.L. 1996. Applied River Morphology. Wildland Hyrdology.
Seehorn, M.E. 1992. Stream Habitat Improvement Handbook, U.S. Forest Service, Southern
Region, Technical Publication r8-TP.
U.S. Department of Agriculture (USDA). June, 1998. Final Draft Stream Corridor Restoration -
Principles, Practices, and Processes.
USDA. Soil Conservation Service. October, 1992. Soil Bioengineering for Upland Slope
Protection and Erosion Control. In: Engineering Field Handbook. October, 1992.
USDA. Soil Conservation Service (SCS),1988. Soil Survey of Cabarrus County, North Carolina.
130pp. Plus maps.
U.S. Department of Interior, Fish and Wildlife Services, 1995. National Wetland Inventory Map:
7.5 minute quadrangle, Concord, N.C.
U.S. Department of Interior, Geological Survey. 1969, Photorevised 1987. 7.5-minute quadrangle
topographic map series: Concord, N.C.

11

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Table 1
DPM of the Carolinas
Partial Species List for Plantings3
Name Habitat value Flood tolerance' Rooting ability2 Size form
1. Woody vegetation:
Corpus amomum* Very good Medium Very good Small shrub
Silky Dogwood
Salix nigra* Good High Excellent Small tree
Black Willow
Salix sericea Good High Very good Large shrub
Silky Willow
Sambucus canadensis* Very good Medium Good Small shrub
Elderberry
Populus deltoides Good High Very good Tree
Eastern Cottonwood
Viburnum dentatum Good Medium Good Medium shrub
Arrowwood Viburnum
Cephalanthus occidentalis Very good High NA4 Small shrub
Button Bush
Betula nigra Good Medium NA Tree
River Birch
Fraxinus pennsylanica* Poor Medium NA Tree
Green Ash
Platanus occidentalis Good Medium NA Tree
Sycamore
II. Non-woody vegetation:
Peltandra virginica Fair High NA Herb
Peltandra
Sagittaria spp. Fair High NA Herb
Arrowhead
Iris pseudacorus Good High NA Herb
Yellow Iris
Iris virginica Good Medium NA Herb
Blue Iris
Acorus calamus Good High NA Herb
Sweet flag
Pontederia cordata Good High NA Herb
Pickerelweed
Juncus effusus * Fair High NA Herb
Common soft rush
' Tolerance to flooding:
• High - severely damaged after 10 to 30 days of flooding.
• Medium - severely damaged after 6 to 10 days of flooding.
• Low - severely damaged after 1 to 5 days of flooding.
2 Rooting ability refers to the plant's ability to root from dormant cuttings.
3 Information compiled from "A Field Guide to North Carolina Wetlands" (NCDEHNR, 1996) and "Soil
Bioengineering for Upland Slope Protection and Erosion Control" (USDA, 1992).
4 Species with an NA status indicates that there is little information regarding this species performance in
bioengineering techniques.
* Plant is presently growing on site.

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STREAM CORRIDOR RESTORATION
Principles, Practices, and Processes
Final Manuscript Draft-
This version has been made available due to the
immediate demand for this document. Please
note that this is the final draft and not
necessarily the final document and will contain
minor errors. If you find any, please note them
and contact us.
JUNE, 1998

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LAwGmB
GROZ.Jh
February 19, 2001
CERTIFIED MAIL 2 3 201T
RETURN RECEIPT REQUESTED
Mr. John R. Dorney
Non-discharge Branch/Wetlands/401 Unit
1621 Mail Service Center I ,
Raleigh, NC 27699-1621.
4,
Subject: Approval of Payment into the NC Wetlands Restoration Program
DPM of the Carolinas
After-the-Fact Permit
U.S. Highway 29/601 Office Building Site
DWQ Project No. 000034 \ A(j
Cabarrus County, North Carolina
LAW Project 30100-9-4882
Dear Mr. Dorney:
As you are aware, Law Engineering and Environmental Services, Inc. (LAW) is the authorized
agent for DPM of the Carolinas with respect to the Section 404 Wetlands Permit and Section 401
Water Quality Certification in the above-referenced matter. Your written correspondence dated
April 6, 2000 revealed that proposed on-site stream mitigation did not meet stream restoration as
defined in North Carolina Water Quality General Certification #3257 and that other forms of
mitigation, such as payment to the Wetlands Restoration Program, must be arranged in order to
provide a complete Water Quality Certification application.
LAW is submitting this letter to inform you that the North Carolina Wetlands Restoration Program
(WRP) will accept payment for the relocation of approximately 270 linear feet of stream channel
associated with the U.S. Highway 29/601 Office Building project located in Cabarrus County,
North Carolina (see attached letter). Subsequently, DPM has elected to pay into the NC Wetlands
Restoration Fund (WRF) as compensation for the above-mentioned stream impacts. LAW's storm
water engineers recently discussed the requirements associated with storm-water management on
the subject property. It is anticipated that the requisite storm-water management plan will be
forwarded to Todd St. John by February 21, 2001.
LAW Engineering and Environmental Services, Inc.
2801 Yorkmont Road, Suite 100 • Charlotte, NC 28208
704-357-8600 • Fax: [phone]
Serving the Charlotte area for over 50 years
Mr. John Dorney
February 19, 2001
Page 2
Your assistance and continued processing of the subject water quality certification is appreciated.
LAW would appreciate your written concurrence with regards to payment into the WRF for
impacts associated with the U.S. Highway 29/601 Building project. If you have any questions or
comments, please contact me at [phone] extension 5543, or at [e-mail].
Sincerely,
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
?. .
Michael A. gn o Richard B. Darling, C.E. J
at Q ea
Senior Envir nmental Scientist Principal
Environmental Scientist
MAI/RBD: jet
cc: Mr. Todd St. John, Division of Water Quality
Mr. Todd Dickens, DPM of the Carolinas
Mr. Samar Bou-Ghazale, Mooresville Regional Office
Mr. Ronald E. Ferrell, WRP
By r^ ____ With Permission