20052015 Ver 3_More Info Received_20070306

HAL OWEN & ASSOCIATES, INC.
SOIL & ENVIRONMENTAL SCIENTISTS
P.O. Box 400, 266 Old Coats Road
Lillington, NC 27546-0400
Phone [phone] /Fax [phone]
E-mail: [e-mail]
6 March 2007
Ms. Cyndi Karoly
DWQ 401 Permitting Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Reference: NBR Major Variance Request
Evans Estates Subdivision, Lot 37
Located at 102 Drakeford Drive, Cary, Wake County, NC
DWQ Project # OS-2015v.3
Dear Ms. Karoly,
We received notification in a letter dated 19 February 2007 that the processing of the
NBR Variance Request for the above referenced property has been placed on hold pending
submittal of additional information. The following information is provided as requested.
Item 1: Signed Operation and Maintenance agreement (enclosed).
We trust that this provides the additional information that you requested and that the
permitting process can proceed. If you have any questions or need additional information, feel
free to contact us at your convenience.
Sincerely,
Kam- _ ~~G--
Krissina B. Newcomb
CC: Mike Horan -DWQ Raleigh Regional Office, 3800 Barrett Drive, Raleigh, NC 27609
George Bailey - PO Box 1225, Cary, NC 27512
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Soil Science Investigations • Wetland Delineations, Permitting, and Consulting

. Mar, 6. 2007' 4:57PM~y~ Bailey Cont ract i ngNi t~ No, 6023' P. 2
BMP OPERATION'S AND N~I'ENANCE AGREEIVIENT
RAIN BARRELS:
The rain barrels are set into a gavel dissipation pad surrounded by landscape .timbers for flow dissipation.
Maintenance activities shall be performed as follows:
1. The rain barrel(s) shell 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, $arrel(s) should be oaipry
24 brs after final rain fall.
c_ Inspect the gavel pad and remov® any debris and keep level.
d. Repair ®ny eroded areas Ieading from the landscape timbers. Replace or repair
and reseed arcs as needed.
2. 1'nspect and repay the collection system (gutters, downspouts, etc_) Pour (4) [iu~as a year
t0 maintain proper fimctioT7nP,
LE'V'E SPREAbER:
The level spreader is defined as an elongaxed, level threshold, designed to diffuse stormwater runoff.
Maintenance activities xlxall 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. ,
6. Xnspect level spreader(s) Par avideaee of scour, undercutting, settlement of the
stricture, and concentrated flows downhill from the level Apreader(s).
c. A level elevation shall be maintaln~ed across the entire flow spreading structure at all
times. Repair or replace the level spreader if it is damaged.
d. Mo~vv vegetative cover, to a height of six (t;) inches and prune plants if they cover
over half of d~.e level spreader surfhce.
e. Repair eroded areas end replace/t~eplant dead or damaged vegetation.
2. The contractor should avoid the placement of any material on and prevent construction traffic
across the stnecture. If the measure is damaged by construction tra£'fio, ii shall be repaired
immediately.
3. Inspect anal repair the collection system (e.g., catch basins,.pipes, swales, ripiap) four (4)
times S year to maintain proper functioning.
C~TDERGROUND 1NFILTRATiON WELL
The dry well is defined as a short, deep, rock fflled trench with no outlet that receives stormwater runoff,
Runoff' i& stored zn the void space between the stones and infiltrates through the bottom and into the soils.
Maintenanae~activities shaIl be performed as fellows:
1. After every runoff-producing event and at least monthly inspect thebypass/overflow structure
forblockage 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 covet to maintain a maximum height of 6 inches, and remove trash and
blockages as needed to =gairjtais- system performance.
Received Time .Mar. 6. 3:51 PM

• Ma r• 6. 2007' 4:57PM~wi Bailey Contractingry~t~
No. 6023' P• 3~
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 Ht11 immediately.
4. If the Town of Chaprl Hill deterrinines that the system is fading, the system will immediately
bo ropaired or replaced to original desi,gri specifications with the addition of a monitoring
well. If the system cannot be repaired to perform its design function, othez stortnwater control
devices as allowed by the Town o£ Chapel 13111 must be designed, approved and constructed.
S. If repair or replacement is required the system shall be restored to the original depth without
over-excavating. Ovor-excavating may cause the required water table separation to bo reduced
and may. compromise rb,c ability of the sys~m.to perform as designed. lt~oved sediment
shall be disposed oEin an appropriate manner and shall not be•handled in a manner that will
adversely impact water quality (i.e, stoelcpiling neat a stormwater treatment device or stream,
etc.).
A benchmadc shall be established in the infiltration system. 'I'!•,e benchmark will dQCUment 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 thatff will give an accurate depth reading and not
readily penevate into accumulated sediments.
VVhen•the depth at the benchmark reads ,the accumulated sediment
sh$1l 6e removed from the system
Desii~ct ]fnfotmatxon:'
Soils Type _S _ Loam
~-filn-ation rate 0.4~ in/hr or cf/hr/sf (circle appropriate units)
beaten Volume I25 of
Design Si:ortn 1-inch evert
perforated Pipe Size ~ 12 .inch diameter
Perforated Pipe Length ft
IJo_ Observation'WeIls 1
Stone Type 1-I/2"-2"
Stone Void Ratio O,a
Basitt Dimensions 13.5 ft wide X 18 ft Long X 3 ft Deep
Volume provided ~~96 __ cu.ft
Bottom Elevation fZnsl (feet mean sea 1cve1)
Storage/Overflow ~,sl
I acknowledge and agree by my sig~tature below that 1 am responsible for the performance of the
maintenance procedures listed above.,I agree to notify Wake County UWQ of any ptoblenas with
the system or prior to as~y cl~nges to the system or respfx('s~ble party. j~
Print Warne and Title;
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Received Time Mar. 6, 3;51 PM

. Mar. 6, 2007 4:58PMi1V1 Bai 1 ey Cont ract I ngHit~

Title:
Address:
Phone:
Signature:
Date'
No, 6023/ P, 4b
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Note; The legally responsible party should not be a homeowners associatxon,uniess more than.
50% of the lots ha~va been.sold and a resident of the subdivision has been named the president.
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I, ,~~,~ ~ ' ~~ ' ~~ , a Notary Public for the State of
~; ~ ~~~ ~ County o ,~ do F~ereby certify that
• ,n,~ _,.. perSOlaally appeai:ed bePoro me this day of
~ ~ ~ '~ -~ . and acknowledge the due execution of the forgoing wet
[wetland.] detention basin maintenance requirement9. VV'itness my hand and official seal,
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Received Time Mar. 6. 3;51 PM