20070936 Ver 1_Stormwater Info_20071105

o~-oq3.~
TF~ JOHN R McADAMS COMPANY, INC.
LETTER OF TRANSMITTAL
To: Ms. Annette Lucas Date: November 2, 2007
NC Division of Water Quality
401/Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250 ** FEDERAL EXPRESS *''
Raleigh, North Carolina
Re: 77 Overlook Plat Job No.: BCP-07000
919-733-1786
I am sending you the following item(s):
COPIES DATE NO. DESCRIPTION
3 Res onse to Comments Letter
3 Co of 10/22/07 DWQ Comments
3 Si ned O&M A reement (1 Ori final-2 co ies)
3 401 Extended Detention Wetland Worksheet
3 Construction Plans
These are transmitted as checked below:
® As requested
® For approval
® For review and comment
Remarks
® For your use
___
Copy to: Signed: ~ ~~ ~~~~ /~P
ames W. Caldwell, PE
Project Man e
FOR INTERNAL USE ONLY
^ Copy Letter of Transmittal Only to File NUV 5 lO~l
® Copy Entire Document to File DENk - n~.~i c,, ..:; . ~,-~
~~AI~lAlltlp iT1/tT6R BR~eh
CIVIL ENGINEERING LAND PLANNING SURVEYING
5311 Seventy-Seven Center Drive, Suite 66 Charlotte, North Carolina 28217
704-527-0800 (office) 1 [phone] 704-527-2003 (fax)

~'in~
i~. THE JOHN R.
~'~
November 2, 2007
~ ~ r ~ ~ ~° Since 1979
McADAMS COMPANY, INC.
Ms. Annette Lucas
North Carolina Division of Water Quality
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard, Suite 250
Raleigh, North Carolina 27604
~ ~~~~ ~~
~~:
N~iv 1(17 ..
E . fz _ tiVh; ~h uuA~i71'
Re: 77 Overlook Park
Response to Comments dated October 22, 2007
BCP-07000
Dear Ms. Lucas:
Below please find our response to your comments for the above referenced
project:
Comment 1: The plan details indicate that the Stormwater BMP is a
Stormwater wetland; however, a wet detention basin supplement
form was submitted in the Stormwater management plan. Please
submit a Stormwater wetland supplement form if that is the
BMO that you are intending to use on this site. The current
version of the stormwater wetland supplement form can be
accessed at the following web site:
http://h2o.enr.state.nc.us/su/bmpforms.htm. In your resubmittal,
please provide both worksheets of the supplement form (Design
Summary and Required Items Checklist) and provide all of the
items listed in the Required Items Checklist.
Research Triangle Park, NC
Post Office Box 14005
Research Triangle Park,
North Carolina 27709
2905 Meridian Parkway
Durham, North Carolina 27713
800-733-5646
919-361.5000
919-361-2269 Fax
Charlotte, NC
5311 Seventy-Seven Center Drive,
Suite 66
Charlotte, North Carolina 28217
800-733-5646
704-527-0800
704-527-2003 Fax
www.johnrmcadams.com
Response 1: A revised Stormwater Wetland Supplement Form has been
submitted with these revisions. Since this facility was designed
aizd submitted before October 1, 2007, design parameters from
the 1999 version of the NC DWQ BMP Design Manual were
used. Therefore, the "old"form has been revised and provided
as all of the items on the new form are not pertinent to the
design.
Comment 2: Please provide a properly designed forebay that will capture the
sediment prior to the Stormwater entering the constructed
wetland. Plants should not be specified in the forebay in order to
maximize sediment storage and facilitate clean out.
Response 2: The forebay has been revised to provide a design more
conducive to capturing the sediment as Stormwater enters the
facility. Also, the wetland vegetation leas been removed from
this area.
Comprehensive Land Development Design Services
We help our clients succeed.

Since X979
THE JOHN R. McADAMS COMPANY, INC.
Ms. Annette Lucas
BCP-07000
November 2, 2007
Page 2
Comment 3: Please submit a signed and notarized inspection and
maintenance form for a stormwater wetland. The form that has
been submitted pertains to a wet detention basin.
Response 3: A signed and notarized inspection and maintenance form has
been submitted with these revisions.
Consideration of this response is greatly appreciated. If you should have any
questions or require additional information, please do not hesitate to contact
me at [phone].
Sincerely,
THE JOHN R. MCADAMS COMPANY, INC.
mimes W. Caldwell, PE
Project Manager
Stormwater and Environmental Department
Enclosures

F wkTF
~Q,~.~=^°~_ ~j ~ Michael ~. Lasky, Governor
~ williatn G. Ross Jr., Secretary
~ ~ r North Carolina Department oC Environment and Natural Rcsourres
~-I
O ' 4' `C Colecn II. Sullins, Director
Division of Water Quality
October 22, 2007
DWQ Project # 07-0936
Mecklenburg County
CERTIFIED lY1ALL: RETURN RECEIPT REQUESTED
Beacon #18, LLC
AtM: Jon IVIoz-ris
933 1larris Corners Parkway, Suite 250
Charlotte, NC 28269
Subject Property: 77 Overlook Park
UT to Long Creek [030834, 1 I-120-(0.5), C]
REQUEST FOR ItiIORE INFORMATION: STORIVIWATER ]VTANAGEMENT PLAN
Dear Mr. Morris:
On July 16, 2007, the Division of Water Quality (DWQ) issued a 401 Water Quality Certification to
impact to impact 300 linear feet of unnamed tributary to Long Creel: to construct the transportation center
described in your application received by the DWQ on May 29, 2007. In order to meet Condition 6 of the
40i Certification for this project, a stormmvater management plan was submtted to the DWQ on August 1,
2007. On August 27, 2007, the DWQ sent you a stormwater Duplicity of Effort Notice. Since that time,
your consultant, John R. McAdams Company, Inc., has demonstrated. that this project does not fall under
this policy and that the DWQ is the appropriate stozTrzwater reviewing authority for this project.
The DWQ has reviewed the storn~water management plan far this project and determined that your
storn~water management plan was incomplete as discussed belaw.
Additional Information Reciucsted:
The plan details indicate that the stormwater BMP is a stormwater wetland; however, a wet
detention basin supplement form was submitted in the stornnvater management plan. Please
submit a stormwater wetland supplement form if that is the BMP that you are intending to use on
this site. The cuzrent version of the stormwater wetland supplement form can be accessed at the
following web site: httpa, h2o.enr.state.nc.us,'suibmp forms.htm. In your resubmittal, please
provide both worksheets of the supplement form (Design Summary and Required Items
Checklist) and provide all of the items Iisted in the Required Items Checklist.
2. Please provide a properly designed forebay that will capture the sediment prior to the stormwater
entering the constzvcted wetland. Plants should not be specified in the forebay in order to
maximize sediment storage and facilitate clean out.
3. Please submit a sig~t~ed and notarized inspection and maintenance form for a stormwater wetland.
The form that has been submitted pertains to a wet detention basin.
D ~~~~~~
one
~ itlCatolintl
401 OvcrsighU[~press Revierv Permitting Unit NQ v $ ~pf17 ~~~ntnrall~
i 650 Mail Service Center, Raleigh, North Carolina 27G99-E G50
2321 CYabtrec Boulevard, Suite 250, Raleigh, North Carolina 27G04
Phone: [phone](1 / rA\ 919-733-C,893 / Inicmt.t. h(t.t~; h''c cnr;iate ne.u.'nciv_~tl;inris ~Nh ` I'1'~17w"rt t1i,..., ,
An 1=quai OpportunitylAfnrmative Action Gmployer - 50°S, Recycled/10% Post Consumer Paper

Mr. Jon Morris
Page 2 of 2
October 22, 2007
The DWQ will require the above additional inforn~ation to finalize review of the stornZwater management
plan for the subject property. Please provide the following information so that we may continue to review
your project. You are welcome to contact me at 919-715-3=125 if you have questions or would like to set
up a meeting.
Sincerely,
Annette Lucas, Environmental .Engineer IlI
401 Oversight/Express Review Permitting Unit
AML/an:l
cc: Alan Johnson, DWQ Mooresville Regional Office
USAGE Asheville Regulatory Field Office
File Gopy
Central Files
Filename: U7093G_770verlookPark(Ivtecklenburg}_Flold_SW

stormwater Wetland Inspection and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the stormwater wetland is established, the wetland plants will
be watered twice weekly if needed until the plants become established
(commonly six weeks).
- No portion of the stormwater wetland will be fertilized after the first initial
fertilization that is required to establish the wetland plants.
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the wet detention basin.
- Once a year, a dam safety expert will inspect the embankment.
After the wet detention pond is established, I will inspect it once a month and within 24
hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal
County). Records of inspection and maintenance will be kept in a known set location
and will be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential roblem: How I will remediate the roblem:
The entire BMP Trash/debris is resent. Remove the trash/debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to
wetland erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer a lication.
Vegetation is too short or too Maintain vegetation at a height of
lon a roximatel six inches.
The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the
Swale a licable . sediment off-site.
The pipe is cracked or Replace the pipe.
otherwise damaged (if
a licable .
Erosion is occurring in the Regrade the swale if necessary to
swale (if applicable). smooth it over and provide erosion
control devices such as reinforced
turf matting or riprap to avoid
future roblems with erosion.

BMP element: Potential roblem: How I will remediate the roblem:
The forebay Sediment has accumulated in Search for the source of the
the forebay to a depth that sediment and remedy the problem if
inhibits the forebay from possible. Remove the sediment and
functioning well. dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Erosion has occurred. Provide additional erosion
protection such as reinforced turf
matting or riprap if needed to
revent future erosion roblems.
Weeds are present. Remove the weeds, preferably by
hand. If a pesticide is used, wipe it
on the lants rather than s ra in .
The deep pool, shallow Algal growth covers over Consult a professional to remove
water and shallow land 50% of the deep pool and and control the algal growth.
areas shallow water areas.
Cattails, phragmites or other Remove the plants by wiping them
invasive plants cover 50% of with pesticide (do not spray) -
the deep pool and shallow consult a professional.
water areas.
Shallow land remains flooded Unclog the outlet device
more than 5 days after a immediately.
storm event.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide aone-time
fertilizer application to establish the
ground cover if a soil test indicates
it is necessar .
Best professional practices Prune according to best professional
show that pruning is needed practices.
to maintain optimal plant
health.
Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth possible. Remove the sediment and
of the deep pools (see dispose of it in a location where it
diagram below). will not cause impacts to streams or
the BMP.

BMP element: Potential roblem: How I will remediate the roblem:
The embankment A tree has started to grow on Consult a dam safety specialist to
the embankment. remove the tree.
An annual inspection by an Make all needed repairs.
appropriate professional
shows that the embankment
needs re air.
Evidence of muskrat or Use traps to remove muskrats and
beaver activity is present. consult a professional to remove
beavers.
The micropool Sediment has accumulated Search for the source of the
and reduced the depth to 75% sediment and remedy the problem if
of the original design depth possible. Remove the sediment and
(see diagram below). dispose of it in a location where it
will not cause impacts to streams or
the BMP.
Plants are growing in the Remove the plants, preferably by
micropool. hand. If a pesticide is used, wipe it
on the lams rather than s ra in .
The outlet device Clogging has occurred. Clean out the outlet device. Dispose
of the sediment off-site.
The outlet device is dama ed Re air or re lace the outlet device.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality 401 Oversight Unit at 919-
outlet. 733-1786.

I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Print
a~
Title:
Address:9335 Harris Corners Parkway, Suite 250 Charlotte, North Carolina 28269
Signature:/ \,~ C e~ ~/ f ~~
tcl3~~i=~
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
,1~J~~,~~~~ 1~ • ~~~~~~, a Notary Public for the State of
///.~~/~ /~~u.,~County of , do hereby certify that
~.~, •
personally appeared before me this 30
day o QD ,and acknowledge the due execution of the
forgoing wet detention basin maintenance requirements. Witness my hand and official
seal,
SEAL
My commission expires ~~ a%~;~~Y`'' 2 7 ~d0~

DWQ Project No. ~~ ~~ ~~
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : }]7 ~ yP~'1Cek ~~ K
Contact Person: ~ IQYYI~ S ~/ • C Ci I G~~_~.l 1 Phone Number. (q I~) 31o t- ~G~
For projects with multiple basins, specify which basin this worksheet applies to: Tc~ WP~-l Qy1G(
Permanent Pool Elevation ~ ~ ~' ft. (elevation of the orifice invert out)
Temporary Pool Elevation _f ?~~ • 3 ft. (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
21 y sq. ft
l ~I . to3 ac.
Ll•2~j ac.
sq. ft
2 sq. ft
~ sq. ft
2 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%)*
Temporary Pool Volume ~3~j X21 ~ cu. ft
SA/DA used `3
Diameter of Orifice 7 in.
II. REQUIRED ITEMS CHECKLIST
(volume detained on top of the permanent pool)
(surface area to drainage area ratio)*
(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
requin;ment 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
J~C. The temporary pool controls runoff from the 1 inch rain.
J W C, The basin side slopes are no steeper than 3:1.
,~ ~nI C A planting plan for the marsh areas with plant species and densities is provided.
v~! Vegetation above the permanent pool elevation is specified.
~~ An emergency drain is provided to drain the basin.
W L The temporary pool draws down in 2 to 5 days.
S VJ C Sediment storage is provided in the permanent pool.
vv L A sediment disposal area is provided.
VII C_ Access is provided for maintenance.
~i W C, A site specific, signed and notarized operation and maintenance agreement is provided.
ci WL The drainage area (including any offsite area) is delineated on a site plan.
1 W L Access is provided for maintenance.
S W ~, Plan details for the wetland are provided.
W C. Plan details for the inlet and outlet are provided.
~ A site specific operation and maintenance agreement, signed and notarized by the responsible pariy is provided (see
http://h2o.ehnr.state.nc.us/ncwetlands/oan dm.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.