20070076 Ver 1_Stormwater Info_20070719

~ Kimley-Horn ~ ~~~~~~ ,~ o~ _ ,~o~ ~,
~ and Associates, Inc.
r1 -7 Suite 300
~ 'v , ~ ~ ~ ( 4651 Charlotte Park Dive
Charlotte, NC 28217
C~~NR - ~NA11rK QUAU1'1'
~TLMiO$ ~~ rQ~},~S!AT~R BRANCH TEL [phone]
FAX [phone]
Transmittal
Date: July 18, 2007 Job Number: 018253007.2700
Project Name: Crescent Project at Concord Mills -DWQ #07-0076
To: NCDWQ Wetlands Program Development Unit
Attention: Annette Lucas
2321 Crabtree Blvd.
Raleigh, NC 27604
[phone]
We are sending these by
^ U.S. Mail ® FedEx Priority Box ^ Hand Deliver
^ Other:
We are sending you
® Attached ^ Under separate cover via
the following items:
^ Shop Drawings ®Prints/Plans ^ Samples ^ Specifications ^ Change Orders
^ Other:
Copies Date No.
Description
1 1 Copy of DWQ Permit #07-0076
1 2 401 Extended Detention Worksheet for Wetlands I and 2
1 3 Crescent Apartments Drainage Calculations
I 4 Paving and Grading Plan Sheets C-9 and C-22
I 5 Wetland Landscape Plan Sheets L8-01 - L8-05
1 6 Operation and Maintenance Agreement

These are transmitted as checked below:
® For your use ^ Approved as submitted ^ Resubmit ^ Copies for approval
^ As requested ^ Approved as noted ^ Submit ^ Copies for distribution
^ For review and comment ^ Returned for corrections ^ Return ^ Corrected prints
Remarks: Annette, enclosed is the required storm water management information for the Crescent
Multi-Family site (portion of Rocky River Landing Phase 1) for your review. Please give me a call
with any questions or if you require additional information at 704/9~~54~~-7~~ 490. Thank you.
Copy to: Brian Natwick via: 980.321.6240 Signed C/"~`
Chris Ralph, P. .
P:\018253 Crescent\007 Concord Multi-Family\Correspondence\Trans\DWQ_Sub.doc

O~O~ ~Ax~R~G
-•!
Cfl ~
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Cazoina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
March 27, 2007
DWQ# 07-0076
Cabarrus County
Mr. David Niekamp
Crescent Resources, LLC
400 S. Tryon St., Suite 1300
Charlotte, NC 28285
Subject: Rocky River Landing Development, Phase I
APPROVAL of 401 Water Quality Certification with Additional Conditions
Dear Mr. Niekamp:
You have our approval, in accordance with the attached conditions and those listed below, to
fill 0.49 acre of wetland and 150 linear feet (If) of unnamed stream to the Rocky River in order to
construct the proposed development in Cabarrus in Union County, as described in your application
received by the Division of Water Quality (DWQ) on January 16, 2007. After reviewing your
application, we have determined that this project is covered by Water Quality General Certification
Number 3402, which can be viewed on our web site at http://h2o.enr.state.nc.us/ncwetlands. The
General Certification allows you to use Nationwide Permit Number 39 once it is issued to you by the
U.S. Army Corps of Engineers. Please note that you should get any other federal, state or local
permits before proceeding with your project, including those required by (but not limited to) Sediment
and Erosion Control, Non-Discharge, and Water Supply Watershed regulations. This Certification
replaces the one issued to you on February 22, 2007. Please note the revision of condition #7
of the previous approval letter.
The above noted Certification will expire when the associated 404 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. If you change your project, you must notify us in
writing, 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 the Certification and approval letter; and is thereby
responsible for complying with all conditions.
In addition to the requirements of the certification, you must also comply with the following
conditions:
1. The Mooresville Regional Office shall be notified in writing once construction at the approved impact
areas has commenced.
2. Stream impacts for future phases for the project shall be considered "cumulative" for the project.
N~°` Caro na
turul~ly
North Carolina Division of Water Quality 610 East Center Ave., Suite 301 Mooresville, NC 28115 Phone [phone] Customer Service
Internet: navaterqulaity.org FAX [phone]
An Equal OpportunitylAffirmative Action Employer- 50°k Recycled110% Post Consumer Paper

3. All wetlands, streams, surface waters, and riparian buffers located on the project site where impacts
are not allowed shall be clearly marked (example- orange fabric fencing) prior to any land disturbing
activities.
4. We understand that you have chosen to contribute to the Ecosystem Enhancement Program (EEP)
in order to compensate for the impacts the stream. In accordance with 15A NCAC 2R .0402 and
15A NCAC 2B .0242(7), this contribution will satisfy our compensatory mitigation requirements
under 15A NCAC 2H .0506(h) and 15A NCAC 2B .0233(10). Until the EEP receives and clears your
check (made payable to: DENR -Ecosystem Enhancement Program), the stream impact shall not
occur. The in-lieu-of fee coordinator should be contacted at [phone] if you have any
questions concerning the EEP. You have one month from the date of this Certification to make this
payment. For accounting purposes, this Certification authorizes the fill of 0.49 acre of wetlands and
150 linear feet of perennial streams in the Yadkin River Basin, Cataloging Unit 03040105, and 150
linear feet of stream mitigation is required. Please be aware that the EEP rules require rounding of
stream impacts to the nearest foot and wetland impacts to the nearest quarter acre (15A NCAC 2R
.0503(b)).
5. Use of native vegetation and other soft stream bank stabilization techniques must be used where
practicable instead of riprap or other bank hardening methods. If riprap is necessary, it shall not be
placed in the stream bed, unless approved by the DWQ.
6. Storm water discharge structures at this site shall be constructed in a manner such that the potential
receiving streams (of the discharge) will not be impacted due to sediment accumulations, scouring
or erosion of the stream banks.
7. (Revision) A final written storm water management p{an shall be approved in writing by this Office
prior to the construction of any permanent facilities at the subject site (Phase I). The storm water
facilities must be designed to treat the runoff from the entire project, unless otherwise explicitly
approved by the Division of Water Quality. Before any permanent building is occupied in Storm
water Treatment Zone A, the storm water facilities, as approved by this Office, shall be constructed
and operational and the storm water management plan as approved by this Office, shall be
implemented. Before any permanent building is occupied in Storm water Treatment Zone B, the
storm water facilities, as approved by this Office, shall be constructed and operational and the storm
water management plan as approved by this Office, shall be implemented. Before any permanent
building is occupied in Storm water Treatment Zone C, the storm water facilities, as approved by this
Office, shall be constructed and operational and the storm water management plan as approved by
this Office, shall be implemented
8. No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond
the footprint of the impacts depicted in the Preconstruction Notification application. All construction
activities associated with this project shall meet, and/or exceed, those requirements specified in the
most recent version of the North Carolina Sediment and Erosion Control Manual and shall be
conducted so that no violations of state water quality standards, statutes, or rules occur.
9. Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum
extent practicable. If placement of sediment and erosion control devices in wetlands and waters is
unavoidable, they shall be removed and the natural grade restored within two months of the date the
Division of Land Resources has released the project.
10. Upon completion of the project, the applicant shall complete and return the enclosed "Certificate of
Completion" form to the 401NVetlands Unit of the NC Division of Water Quality. Please send

photographs of the upstream and downstream sides of each culvert site to document correct
installation, along with the Certificate of Completion form.
11. Continuing Compliance. The applicant (Crescent Resources, LLC) shall conduct all activities in a
manner so as not to contravene any state water quality standard (including any requirements for
compliance with section 303(d) of the Clean Water Act) and any other appropriate requirements of
state and federal law. If DWQ determines that such standards or laws are not being met (including
the failure to sustain a designated or achieved use) or that state or federal law is being violated, or
that further conditions are necessary to assure compliance, DWQ may reevaluate and modify this
certification to include conditions appropriate to assure compliance with such standards and
requirements in accordance with 15 A NCAC 2H.0507(d). Before codifying the Certification, DWQ
shall notify the applicant and the US Army Corps of Engineers, provide public notice in accordance
with 15A NCAC 2H.0503, and provide opportunity for public hearing in accordance with 15A NCAC
2H.0504. Any new or revised conditions shall be provided to the applicant in writing, shall be
provided to the United States Army Corps of Engineers for reference in any permit issued pursuant
to Section 404 of the Clean Water Act, and shall also become conditions of the 404 Permit for the
project.
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 that conforms to Chapter 1508 of the North Carolina General Statutes to the Office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This Certification and
its conditions are final and binding unless you ask for a hearing.
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 Mr. Alan Johnson in the Mooresville Regional
Office at 704-663-1699 or Ms. Cyndi Karoly in the Central Office in Raleigh 919-733-9721.
Sirtrely, ,a ~~'~
~y, , ~,~ ,a'/
~ '.w~,,., f~ ,,.r.. ..,+... i4,
t. _ . _, SI/_/11
1
for Alan W. Klimek, P.E.
cc: Army Corps of Engineers, Asheville
Ian McMillan, Wetlands Unit
Cabarrus County Development Svc.
Becky Fox, EPA
Central Files
File Copy
Len Rindner

DWQ Project No. ~ 7 ` ~d ~ (e
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET") WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : Crescent Apartments at Concord Mills - Phase I
Contact PerSOn: Chris Ralph Phone Number: (~04) 954-7490
For projects with multiple basins, specify which basin this worksheet applies to: ExTENDED DETENTION WETLAND # 2
Permanent Pool Elevation
Temporary Pool Elevation
594.0 ft
595.55 ft.
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
Permanent Pool Surface Area
Drainage Area
Impervious Area
Forebay Surface Area
Marsh 0"-9" Surface Area
Marsh 9"-18" Surface Area
Micro Pool Surface Area
Temporary Pool Volume
SA/DA used
Diameter of Orifice
II. REQUIRED ITEMS CHECKLIST
a51o sq. ft.
5.16 ac.
2. a1 ac.
1353 sq. ft.
z 614 sq. ft.
3o~z sq. ft.
1471 sq. ft.
(water surface area at permanent pool elevation)
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(at permanent pool elevation approximately 15%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 15%)'
17437 cu. ft. (volume detained on top of the permanent pool)
z . 06 (surface area to drainage area ratio)*
2 . o in. (draw down orifice diameter)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Applicants Initials
(Q The temporary pool controls runofffrom the 1 inch rain. csEE NOTE 1>
CIQ The basin side slopes are no steeper than 3:1.
CQ A planting plan for the marsh areas with plant species and densities is provided.
c Vegetation above the permanent pool elevation is specified.
~ An emergency drain is provided to drain the basin.
~ The temporary pool draws down in 2 to 5 days.
~~ Sediment storage is provided in the permanent pool.
<R A sediment disposal area is provided.
~ Access is provided for maintenance.
~Q A site specific, signed and notarized operation and maintenance agreement is provided.
CR The drainage area (including any offsite area) is delineated on a site plan.
C R Access is provided for maintenance.
~ Plan details for the wetland are provided.
R Plan details for the inlet and outlet are provided.
C R A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http:l/h2o.eh nr.state.nc. uslncwetlandsloandm.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.
NOTE 1: PER THE CITY OF CONCORD STORMWATER ORDINANCE, THE TEMPORARY POOL WAS SIZED TO
DETAIN THE DIFFERENCE IN VOLUME OF RUNOFF BETWEEP7 THE PRE AND POST 1 YR - 24 HR STORM
EVENTS SINCE THIS VOLUME IS LARGER THAN THE 1" STORM EVE[~IT.

DWQ Project No. Q ~ - UU 7 6
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: .crescent Apartments at Concord Mills - Phase
Contact PerSOn: Chris Ralph Phone Number: [phone]
For projects with multiple basins, specify which basin this worksheet applies to: ExTENDED DETENTION WETLAND # 1
Permanent Pool Elevation
Temporary Pool Elevation
Permanent Pool Surface Area
Drainage Area
Impervious Area
Forebay Surface Area
Marsh 0"-9" Surface Area
Marsh 9"-18" Surface Area
Micro Pool Surface Area
Temporary Pool Volume
SA/DA used
Diameter of Orifice
II. REQUIRED ITEMS CHECKLIST
594.0 ft
595.15 ft.
32652 sq. ft.
11.43 aC.
6.59 aC,
4634 sq. ft.
1252s sq. ft.
10886 sq. ft.
4607 sq. ft.
(elevation of the orifice invert out)
(elevation of the outlet structure invert in)
(water surface area at permanent pool elevation)
(on-site and off-site drainage to the basin)
(on-site and off-site drainage to the basin)
(at permanent pool elevation approximately 15%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 35%)*
(at permanent pool elevation approximately 15%)*
41238 cu. ft. (volume detained on top of the permanent pool)
2.0 6 (surface area to drainage area ratio)*
7 . o in. (draw down orifice diameter)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Applicants Initials
CR The temporary pool controls runoff from the 1 inch rain. (sEE NOTE 1 >
R The basin side slopes are no steeper than 3:1.
~~ A planting plan for the marsh areas with plant species and densities is provided.
~, Vegetation above the permanent pool elevation is specified.
~~ An emergency drain is provided to drain the basin.
CQ The temporary pool draws down in 2 to 5 days.
~e Sediment storage is provided in the permanent pool.
~R A sediment disposal area is provided.
« Access is provided for maintenance.
R A site specific, signed and notarized operation and maintenance agreement is provided.
Ci' The drainage area (including any offsite area) is delineated on a site plan.
CL Access is provided for maintenance.
C ~ Plan details for the wetland are provided.
CQ Plan details for the inlet and outlet are provided.
C A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http://h2o.eh nr.state.nc. us/ncwetlands/oandm.doc).
* Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS -See pp. 19 and 20 of the NC DENR
stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.
NOTE 1: PER THE CITY OF CONCORD STORMWATER ORDINANCE, THE TEMPORARY POOL WAS SIZED TO
DETAIN THE DIFFERENCE IN VOLUME OF RUNOFF BETWEEr~7 THE PRE AND POST 1 YR - 24 HR STORM
EVENTS SINCE THIS VOLUME IS LARGER THAN THE 1" STORM EVENT.

r
'D `1 - ooh L
EXTENDED WETLAND DETENTION OPERATION AND MAINTENANCE AGREEMENT (1/2007)
Name of Project: Crescent Apartments at Concord Mills -Phase 1
Address: Proposed Thunder Road Extension, Concord, NC
Maintenance activities shall be performed as follows:
MAINTENANCE ACTIVITY FREQUENCY
Debris and litter control checks for inlet, outlet and After every storm producing runoff.
orifice obstruction
Provisions for routine vegetation management and As needed during growing season
mowin
Maintenance and Inspection of: Every six months
• Sediment buildup and the need for removal
• Erosion along the bank and the need for
reseeding or stabilization and, if reseeding is
necessary, a reseeding schedule
• Erosion at the inlet and outlet and methods of
stabilization
• Seepage through the dam/control structure
• Operation of any valves or mechanical
components
• Debris buildup in pocket wetlands and need
for removal
Maintenance and Inspection of: Once per year
• Obstructions of the inlet and outlet devices by
trash and debris
• Excessive erosion or sedimentation in or
around the basin
• Cracking or settling of the dam/control
structure
• Deterioration of inlet or outlet pipes
• Condition of the emergency spillway
• Stability of side-slopes
• Up and downstream channel conditions
• Woody vegetation in or on the dam
• Wetlands after a rain event to ensure the
basin is operating as designed
• Clo in of the outlet or too ra id a release
Page 1 of 2

r`
EXTENDED LOCATION ON SITE (DESCRIBE) HOW WILL IT BE ACCESSED?
WETLAND NO.
Larger wetland located in the northern portion Wetland can be accessed using a roll
1 of the Phase 1 site. curb and proceeding along an existing
ridge on the northern side of the
wetland.
2 Smaller wetland located in the eastern portion
of the Phase 1 site. Wetland can be accessed using a roll
curb placed at the head of a parking
s ace between Buildin s 11 and 12.

I acknowledge and agree by my signature below that I am responsible for the performance of the
maintenance procedures listed above. I agree to notify DWQ and/or the City of Concord of any problems
with the system or prior to any changes to the system or responsible party.
Print name: Brian J. Natwick ~i6 Crescent Resources LLC
Title: Development Manager
Address: 400 South Tryon Street, Suite 1300 Charlotte, NC 28202
Phone: [phone] n ~ /I _
Signature:
Date: S S '
I, l~/' fir' ~ ° , a Notary Public for the State o~~.~c.s-e~-,~.~,
County of , do hereby certify that
personally appeared before this ~J day of a o ,and acknowledge the
due execution of the forgoing wet [wetland] detention basin m ' tenance requirements. Witness my hand
and official seal,
No1oy lAubNc
M~nbap Co~iq-
llaw- a Noon Ccrolno
SEAL
My commission expires • ~O aO~d
Page 2 of 2