20052015 Ver 3_More Info Letter_20070219

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
February 19, 2007
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. George Bailey
George Bailey & Associates, Inc.
PO Box 1225
Cary, NC 27513
Subject Property: Lot 37 Evans Estates Subdivision
UT to Crabtree Creek [030402, 27-33-(1), C, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Bailey:
DWQ Project # OS-2015v.3
Wake County
On October 19, 2006, the Division of Water Quality (DWQ) received your Pre-Construction Notification
application dated August 22, 2006, with additional information and your Minor Variance application
received on January 19, 2007 by DWQ, to impact 46 square feet of Zone 2 Neuse River basin protected
riparian buffer for the proposed house at the above referenced site. The DWQ has determined that your
minor variance application was incomplete and/or provided inaccurate information as discussed below.
The DWQ will require additional information in order to process your application to impact protected
wetlands and/or streams on the subject property. Therefore, unless we receive the additional information
requested below, we will have to move toward denial of your application as required by 15A NCAC 2H
.0506 and will place this project on hold as incomplete until we receive this additional information.
Please provide the following information so that we may continue to review your project.
Additional Information Requested:
1. The Operation and Maintenance agreement that you provided for your proposed rain barrels and
level spreaders was not signed. Please complete and return the attached O&M agreement.
Please respond within three weeks of the date of this letter by sending this information to me in writing
and Mike Horan of the DWQ Raleigh Regional Office. If we do not hear from you within three weeks, we
will assume that you no longer want to pursue this project and we will consider the project as withdrawn.
This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] /Internet: htto //h2o enr state nc us/ncwetlands
No ehCarolina
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An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper

Mr. George Bailey
Page 2 of 2
February 19, 2007
authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Ms. Amy Chapman at 919-733-
1786 if you have any questions regarding or would like to set up a meeting to discuss this matter.
Sincerely,
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Cyndi Karoly, Supervisor
401 Oversight/Express Review Permitting Unit
CBKlasc
Enclosures: O&M Agreement
cc: Mike Horan, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Central Files
Kris Newcomb; Hal Owen & Associates, Inc; 266 Old Coats Rd; PO Box 400; Lillington, NC 27546
Filename: 052015v3Lot37EvansEstates(W ake)On_Hold2

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BMP OPERATIONS AND MAINTENANCE AGREEMENT
RAIN BARRELS:
The rain barrels are set into a gravel dissipation pad surrounded by landscape timbers for flow dissipation.
Maintenance activities shall be performed as follows:
1. The rain barrel(s) shall be inspected at least every month and more frequently during the
fall season and after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed if required.
b. Inspect barrel drain orifice to remove any blockage. Barrel(s) should be empty
24 hrs after fmal rain fall.
c. Inspect the gravel pad and remove any debris and keep level.
d. Repair any eroded areas leading from the landscape timbers. Replace or repair
and reseed area as needed.
2. Inspect and repair the collection system (gutters, downspouts, etc.) four (4) times a year
to maintain proper functioning.
LEVEL SPREADER:
The level spreader is defined as an elongated, level threshold, designed to diffuse stormwater runoff.
Maintenance activities shall be performed as follows:
1. After construction and until vegetation has been established, level spreader(s) shall be
inspected after every rainfall. Thereafter, level spreader(s) shall be inspected at least every
month and more frequently during the fall season and after heavy rainfall events:
a. Accumulated sediment, leaves, and trash shall be removed, and repairs made if-
required.
b. Inspect level spreader(s) for evidence of scour, undercutting, settlement of the
structure, and concentrated flows downhill from the level spreader(s).
c. A level elevation shall be maintained across the entire flow-spreading structure at all
times. Repair or replace the level spreader if it is damaged.
d. Mow vegetative cover to a height of six (6) inches and prune plants if they cover
over half of the level spreader surface.
e. Repair eroded areas and replace/replant dead or damaged vegetation.
2. The contractor should avoid the placement of any material on and prevent construction traffic
across the structure. If the measure is damaged by construction traffic, it shall be repaired
immediately.
3. Inspect and repair the collection system (e.g., catch basins,. pipes, swales, riprap) four (4)
times a year to maintain proper functioning.
UNDERGROUND INFILTRATION WELL:
The dry well is defined as a short, deep, rock-filled trench with no outlet that receives stormwater runoff.
Runoff is stored in the void space between the stones and infiltrates through the bottom and into the soils.
Maintenance' activities shall be performed as follows:
1. After every runoff-producing event and at least monthly inspect the bypass/overflow structure
for blockage and deterioration and the infiltration system for erosion, grass cover, and general
condition.
2. Repair eroded areas immediately, reseed as necessary to maintain adequate vegetative cover,
mow vegetative cover to maintain a maximum height of 6 inches, and remove trash and
blockages as needed to maintain system performance.

3. If the dry well does not drain or if unusual ponding is noted (over a three month period) then a
possible failure of the dry well shall be reported to the Town of Chapel Hill immediately.
4. If the Town of Chapel Hill determines that the system is failing, the system will immediately
be repaired or replaced to original design specifications with the addition of a monitoring
well. If the system cannot be repaired to perform its design function, other stormwater control
devices as allowed by the Town of Chapel Hill must be designed, approved and constructed.
5. If repair or replacement is required the system shall be restored to the original depth without
over-excavating. Over-excavating may cause the required water table separation to be reduced
and may compromise the ability of the system to perform as designed. Removed sediment
shall be disposed of in an appropriate manner and shall not be handled in a manner that will
adversely impact water quality (i.e. stockpiling neat a stormwater treatment device or stream,
etc.).
A benchmark shall be established in the infiltration system. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used to
determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the depth at the benchmark reads ,the accumulated sediment
shall be removed from the system
Design Information:
Soils Type Sandy Loam`
Infiltration rate 0.52 ir-/hr or cf/hr/sf (circle appropriate units)
Design Volume 125 cf
Design Storm 1-inch event
Perforated Pipe Size 12 inch diameter
Perforated Pipe Length ft
No. Observation Wells 1
Stone Type 1-1/2"-2"
Stone Void Ratio 0.4
Basin Dimensions 13.5 ft wide X 18 ft Long X 3 ft Deep
Volume provided 196 cu.ft
Bottom Elevation finsl (feet mean sea level)
Storage/Overflow fmsl
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 Wake County DWQ of any problems with
the system or prior to any changes to the system or responsible party.
Print name and Title:

;<
Title:
Address:
Phone:
Signature:
Date:
Note: The legally responsible party should not be a homeowners association unless more than
50% of the lots have been sold and a resident of the subdivision has been named the president.
I, , a Notary Public for the State of
,County of , do hereby certify that
personally appeared before me this day of
,and acknowledge the due execution of the forgoing wet
[wetland] detention basin maintenance requirements. Witness my hand and official seal,
SEAL
My commission expires