20060973 Ver 4_More Info Received_20091112

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Joyner Keeny, PLLC
Land Planning & Surveying
a small business " HUBZone' certified company
LETTER OF TRANSMITTAL Date: 11/10/09 Job No: 020386
Attention: Annette Lucas/Ian McMillan RE: DWQ Project # 06-0973 Birchwood Subd.
TO: North Carolina Department of Environment & Natural Resources ?RM&NOWLg
Division of Water Quality - 401 Oversight/Express Review Permitting Unit
1650 Mail Service Center NOV 1 2 2009
Raleigh, NC 27699

Phone: [phone] DENR - WMTER 1WAIITY
WETUNDS AND STORUWATEII BRANCH
WE ARE SENDING YOU THE FOLLOWING:
? Final Plat Prints ? Preliminary Prints ? Original Mylar ® See Below
? Final Plat Prints Stamped ? Sketch Plan Stamped ? Construction Plans
Preliminary Preliminary ? Legal Description
THESE ARE TRANSMITTED AS CHECKED BELOW:
? For Price ? Bid For Construction ? As Requested ? For Your File
® For Review & Comment ? Please Reply ? See Below
® Regular Mail ? FedEx ? UPS ? Delivered by JK ? Picked Up
-- Comes

5 Date I I --- Description
- -? - -
Response letter to 4'n Review Comments & Copy of DWQ 4th
Review Comments
5 Soil Scientist Dan Bliley) Letter regarding SHWT

5 Drainage Area Map, Approved plans Sh. LS-12 (Ditch X-Sections)
& Ditch Calcs.

REMARKS:
Annette/Ian,
Attached are five copies of the information I emailed to you yesterday to address your 4`h review commnets.
Please call me if you have any questions or require additional infor tion.
Thanks
Brent Niemann
Copy(s) TO: FILE SIGNED: krW / `
ZAadmin\Forms\JK Letter of Transmittal.doc
Post Office Box 7533 • 209 North Pearl Street. • Rocky Mount • North Carolina • 27804-7533
252- 977-3124 (office) • www.ioynerkeeny.com • 252- 985-6026 (fax)
,Joyner cr,,/, PL.La
Planning & Land Surveying
a small I winess "HL BZonC certified company
November 9, 2009
Ms. Annette Lucas/Mr. fail McMillan
North Carolina Department of Environment & Natural Resources
Division of Water Quality
401 Oversight/Express Review Permitting Unit
2321 Crabtree Boulevard
Raleigh, North Carolina 27604
Re: DWQ Project # 06-0973 (JK Project# 020386)
Birchwood Subdivision - Section 7
Town of Nashville, NC
Dear Ms. Lucas/Mr. McMillian:

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NO V 12 2009
SAND STTU"WAWiiil BRAM01
This letter is in response to your Request for More Information dated September 23, 2009. Following are
responses to the additional information requested.
1. Attached is a letter dated October 20, 2009 from Daniel J. Bliley, Licensed Soil Scientist,
detailing his findings from on-site hand augers to determine the Seasonal High Water Table.
As previously noted on the Dry Extended Detention Basin Supplement Form from our original
permit application on January 13, 2009, the existing dry detention basin on this site was designed
and constructed to meet the requirements of The Town of Nashville to restore the peak runoff of
the 2- & 10-Year Post-development storm to Pre-development levels. It was never the intent for
this basin to meet the standards of a Dry Extended Detention Basin as defined in Chapter 17 of
the NCDWQ Stormwater BMP Manual. Additionally, as previously requested by your office, we
provided a detailed breakdown of on-site impervious surfaces by drainage area, none of which
exceed 24%, thereby eliminating the requirement of a Stormwater Management Plan as part of
this permit process (see attached Drainage Area map, as previously submitted). Subsequently, the
design and construction of the existing dry detention basin does not fall within the jurisdiction of
NCDWQ, as it pertains to acquiring the 401 permit for Phase 1 of this site. Therefore, the
requirements of Chapter 17 of the DWQ BMP Manual do not apply to the existing dry detention
basin.
3. The existing ditch along the southern property line was analyzed for the existing contributing
drainage area plus the discharge from the dry detention basin. Per Sheet LS-12 of the approved
subdivision plans (attached for reference), a NAG C350 permanent liner was specified (see
Ditch#29). Additionally, I calculated that a permanent liner of 2"-6" Fescue is adequate as well.
All of my calculations are attached for your reference.
Post Office Box 7533. 1051 North Winstead Avenue • Rocky Mount • North Carolina • 27804
252- 977-3124 (office) • www.4oynerkeeny.com • 252- 985-6026 (fait)

Ms. Annette Lucas/Mr. Ian McMillan
Page 2 of 2
November 9, 2009
Please review the attached items and do not hesitate to call or email me if you have any questions or
require additional information.
Sin rely,
rent. Niemann, PE
Joyner Keeny, PLLC
DANIEL J. BLILEY SOIL AND LAND USE CONSULTANT
614 SOUTH SECOND STREET SMITHFIELD, NORTH CAROLINA 27577 [phone]
October 20, 2009
Mr. Brent Niemann
JOYNER-KEENY & ASSOCIATES, INC.
P.O. Box 7533
Rocky Mount, North Carolina 27804
Brent:
Attached with this letter is a sketch map showing the locations of the dry detention basin and associated
ditches , which are part of the storm water containment system for section 7 of Birchwood Subdivision
located in the Town of Nashville. Also shown on the sketch are the locations of soil borings that were made
recently as a means of estimating the depth to the seasonal high water table.
The locations of the features (including the soil borings) as shown on the map were estimated using a
Trimble mapping grade GPS receiver. These locations should be of sufficient accuracy for the present
discussion regarding the depth to the seasonal water table. The soil boring locations are marked with blue
flagging strips attached to the local vegetation.
You requested to know if there is evidence from the site and soils that the water table is within two ft. of
the bottom of the dry detention basin as constructed and if there is a possibility that the basin could serve as
sump to influence the natural drainage of the adjoining wetlands.
The soils at this site are formed in loamy and clayey Coastal Plain Sediments on a broad upland flat
depression in the Middle Coastal Plain province. These soils are mapped in the Rains soil series by the
USDA Soil Survey of Nash County. These soils are dominantly poorly drained. The present local
vegetation consists of a mixture of Loblolly Pine and Oak-Maple hardwoods less than 20 to 25 years in age.
The soils at sites 1 & 2 have very dark grayish brown loam surface layers 8 to 10 inches thick. The
underlying subsoils are gray heavy clay loam to sandy clay, that are mottled with reddish brown and
brownish yellow. The subsoils are underlain by light gray, grayish brown and light yellowish brown
structureless sandy loam layers at depths ranging from 40 to 48 inches from the soil surface. The subsoil
clays apparently have slow permeability, which is associated with the high clay content.
In their natural (pre-development, pre-settlement) condition these soils had a seasonal high water table
within 12 inches of the soil surface as evidenced by the dark colored surface organic rich surface layers and
the gray subsoil matrix colors. At present it is unlikely that the seasonal high water table will be within 12
inches of the soil surface except for relatively short periods during the winter months of the year and at
times following unusual rainfall events. This may be perched water affected by the clayey subsoils. Also
the natural hydrology of the site has been altered by the development of the adjoining properties (with
diversion of surface water) and the clean up and r-establishment of positive drainage in the existing ditch
(Old Ditch) that borders the southern edge of the property. Furthermore the evergreen (pine) vegetation on
the site will withdraw more water throughout the year from the soil via evapotranspiration than hardwoods.
At the time of these investigations (10/16/2009) the observed water table was below 60 inches from the soil
surface. It should be noted that wetland delineations in these soils areas are difficult to make and can often
be questioned because of the intermittent nature of the wetness condition and the wetland hydrology
indicators are seldom clearly defined.
Soil borings 1 & 2 are in close proximity to the elongated wetland area that adjoins and is impacted by
SOIL MAPPING - SITE INVESTIGATION - LAND RESOURCE DATA EVALUATION
Licensed Soil Scientist

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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
September 23, 2009
DWQ Project # 06-0973, Ver. 4
Nash County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
Mr. Claude Mayo
Maevco Development, LLC
3051 Sunset Avenue
Rocky Mount, NC 27804
Subject Property: Birchwood - AFTER-THE-FACT
Ut to Sapony Creek [030302, 28-55-(5.5), WSIV, NSW]
REQUEST FOR MORE INFORMATION
Dear Mr. Mayo:
On August 25, 2009, the Division of Water Quality (DWQ) received your After-The-Fact application
dated August 20, 2009, to fill or otherwise impact 0.243 acres of 404/wetland, and 0.00 square feet of
Zone 1 Tar-Pamlico River basin protected riparian buffer, and 0.00 square feet of Zone 2 Tar-Pamlico
River basin protected riparian buffer, to construct the proposed residential development at the site. The
DWQ has determined that your 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 five
copies of the additional information requested below, we will place this project on hold as incomplete
until we receive this additional information. If we do not receive the requested information, your project
will be formally returned as incomplete. Please provide the following information so that we may
continue to review your project.
Additional Information Requested:
1. Please provide the results of in-field soil testing to determine the level of the Seasonal High
Water Table (SHWT).
2. Per Chapter 17 of the DWQ BMP Manual, the SHWT must be at least two feet below the invert
of the dry detention basin. Given the proximity of the dry detention basin to the wetland, it is
extremely unlikely that this separation exists. Per the DWQ BMP Manual, the only detention
devices that may be used in an area with a high SHWT are wet detention basins and stormwater
wetlands.
3. Please provide calculations to show that the drainage feature that is receiving the flow from the
BMP will be able to convey the flow without becoming eroded.
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
Location: 2321 Crabtree Blvd., Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone]
Internet: http://h2o,enr.slate.nc.uslncwetlands/
North Carolina
Natu&11!
An Equal Opportunity 1 Affirmative Action Employer
Maevco Development, LLC
Page 2 of 3
September 23, 2009
Please submit this information within 30 calendar days of the date of this letter. If we do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn and
you will need to reapply with a new application and a new fee.
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 authorized (at
this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian McMillan at 919-733-1786 if you have
any questions regarding or would like to set up a meeting to discuss this matter.
Sincerely, 1
42,
CBKI m
Cyndi Karoly, Supervisor
I Oversight/Express Review Permitting Unit
cc: USACE Raleigh Regulatory Field Office
Lauren Witherspoon, DWQ Raleigh Regional Office
File Copy
Jay Keller, Keller Environmental, 7921 Haymarket Lane, Raleigh, NC 27615
Filename: 060973 Ver4Birchwood(Nash)On_Hold
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Hydrograph Plot 3
Hydraflow Hydrographs by Intelisolve
Hyd. No. 10
Birchwood---1-22-05
Hydrograph type = Reservoir
Storm frequency = 10 yrs
Inflow hyd. No. = 1
Reservoir name = Birchwood --1-22-05--wide
Storage Indication method used
Q (cfs)
30.00
25.0(
20.0(
15.00
10.00
5.00
Birchwood---1-22-05
Hyd. No. 10 --10 Yr
Q (cfs)
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0.0 0.2 0.3 0.5
Hyd No. 10 Hyd No. 1
Sunday, Jan 23 2005,12:42 PM
Peak discharge = 10.79 cfs
Time interval = 1 min
Max. Elevation = 182.52 ft
Max. Storage = 6,010 cuft
Hydrograph Volume = 8,956 cult
0.7 0.8 1.0
0.00
1.2
Time (hrs)

Channel Report
Hydraflow Express Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc. Monday, Nov 9 2009
Birchwood Subd - Section 7: Existing PL Ditch Analysis
Trapezoidal Highlighted
Bottom Width (ft) = 3.00 Depth (ft) = 1.84
Side Slopes (z:1) = 3.00, 3.00 Q (cfs) = 66.00
Total Depth (ft) = 4.00 Area (sqft) = 15.68
Invert Elev (ft) = 180.00 Velocity (ft/s) = 4.21
Slope (%) = 0.30 Wetted Perim (ft) = 14.64
N-Value = 0.020 Crit Depth, Yc (ft) = 1.55
Top Width (ft) = 14.04
Calculations EGL (ft) = 2.12
Compute by: Known Q
Known Q (cfs) = 66.00
Elev (ft)
185.00
184.00
183.00
182.00
181.00
180.00
179.00
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11/01/01 02438(v gl>?4100 40H. -5?G7"to?-S 4
TEtAPbAaY GWEv- AtAtycx-?, Use = iJaa--r4 AM6,94dW 0-?o-J
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ql Peiud Lh,.) RadwLlIIj D! 12th It I
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LINER RESULTS
Not W Scale

Reach Mating Type
;lability Anals- Vegetation Chatactnielits
P-mble
Cabulaled
Wely Fatty
Remarks
;leple Pallern Phase Class T,y Densly Sheer Stress
Pdl ;heel;ness
Ipall
sft.ghl C390 U-gelaled 1 3.20 032 991 STABLE
Staple E
E
5eLLret '.,4m Acr c-35o (Pe-p- 5ker bS-m OA Ngvk--D S;(*D. AAA )
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Oischage Peak Flow Vetoc4y[IAS) Area ls0.I11 llydraW'c Normal Urxe'xllorced Vegelali 1 00411
le Pergd lhr.l Radwsllll 05 litl
66.0 Ql 217 2671 1.41 1 2.53
S = 0.0030
30 Wdrh.3.00X D
LINER RESULTS
NIX I. Scale
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Reach Mall", Tyge
StabiliryAnalysis Vegetation Characterislice
Permissible
C
led
Safety Factor
Remarks
slavle Panern Phase clan ryve oena4y sneasness ,St
snaasre:,
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Slrer3hl Umeinlorced Vegetation 0 Bunch5075%. 3U U47 7.04 STAKE
Soil Loam 0035 0.040 0.87 UNS iAUL
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t _ ~ ~ 1 TOTAL. DRAINAGE AREA TO BMP 41.086 cc ; / ~ 1 1` > ° ~ ~ ~
/ / ON- ~ OFF-SITE AREAS ~ ! ° ° w ~
( ) .d 1 1 ° 1 ~ 1 ~ ~ ° l~~ t I , ` ~ ® ~
TOTAL SITE AREA (18 LOTS ~ COS)= 20.880 AC ON-51TE TO BMP = 15.813 AC 1 t t ~ u Y
ON-SITE BYPASS BMP = 5.067 AC ' >z 1 ' 1 ' 1 1 / ~ ~ ~ ~ 1 ~ ~
ON-•SITE_IMPERVIOU TO BMP_(ENTIRE R/W & 14 LOTS) r' ° ° 1 ' l , ~ ~ • ~ 1 ~ , , ~ ~
ASPHALT ROADS = 0.710 AC 1 ° / I 1 / ~ II ~ ~
l t T P. A, l . . IV CHES IN R W = 0.052 AC
DRIVEWAYS (14 LOTS) = 0.386 AC ! ! / ° 1 / 1 „ / HOU~$®(14 L T 0 57~ AC 1 -....-,1, / - ~ l.;' 1 1 -
'TOTAL. ON-SITE IMPERVIOUS TO BMP - 1.727 AC ~ l l 1 / 1 \ nom,,,, . 1 ~ tr T , X ~ I; , ~
Je ~,P~Ir I l/ \ `f\
ON-SITE AREA PERCENT IMPERVIOUS TO 8MP (1.727/15,$13 AC) = 10.9% ! / _ .,~1 t t ° i ,
~ ON.:~ITE IMPERVIOUS BY-PAS (-4 LOTS & COST / i £ 4f~~~o~ }r 1 1 1 ;ti ~ ~ ® .~t{,' Ir III /l \
,ASPHALT ROADS = 0.000 AC ° 1 t;~,, t / DRNE APPROACHES !N R/W = 0.000 AC 1 / l „ I 1 I T ~."fin ~1 "••I I I I ,
' DRIVEWAYS (4 LOTS) = 0.110 AG t 1 1 t l ! ~;..,..r M+ I I I t ~
f ~ ° I II II . 7 I t / ~ S f, i~ , ~ ~ I I F
/ 'OTAL ON-SITE IMPERVIOUS TO 8MP = 0.275 AC 1 , " I ; , t ,
ON-51TE AREA PERCENT IMPERVIOUS BY-PASS (0.275/5.067 AC) = 5.4% r l 1 ! V I 1 `F ' F J I~ I "~1j II ~i, I ~ . E f ~ I ~,e~ I ~ I I ~ II I I \ ~
1 1 1 I ~i, X y; : ' l !p®$ypX F ~ ~ ~
A I ! ,'i/ s TOTAL ON-SITE IMPERVIOUS AREA (1,727+0.275 AC = 2.OOZ AC
TOTAL ON-SITE PERCENT IMPERVIOUS (2,002/20.880 AC) 9.6% ( / 1 i r~ II ~ I I
r~~ i h l . Y, ~ 7 TOTAL AREA OF DEVELOPED LOT5 6c R/W = 91.202 AC ` . ~ ° ~ 1 / ~ ' ~ o ` I PROPERTY r ~ , I r ; i ~/T l BOUNDARY II I ~'1''~„ ~ I ~ I ~
TOTAL. PERCENT IMPERVIOUS OF pEVELOPED AREA (2.002/11.202 AC) = 17.9% 1 1 °a, F I (TYP) , I ,
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5 nthetic Liner such as
° NAG C350. ~ Synthetic Liner such as
~•0 ,'32 NAG C350. ~ S nthetic Liner such ae P i 2.5' J 1.6° ° NAG C3 P 2.5' 1.7 50. such as , Q • , : e . ; . • 1,06
2 4 2 P J f•`qP. .9."u. •'a:~ •.'e`' ~a P" Diameter
~ 2 NOT TO SCALE NOT TO SCALE 4
NOT TO SCALE
c ~ D®~5 ^'~~u
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3/4" Exterior
Plywood
~ 5 nthetic Liner such os - Fury Bottom
° ° NAG C350. ~ Synthetic Uner such as 1.5 0.79 of .Plywood
J O,q.S° NAG 0350. 0 Synth®tic liner such as t 1,0 P J ° 1.99' NAG C350. such as
2 ~ 2.5 J J 2 q
NOT TO SGAIf 2 NOT TO SGA1E ~ PLYWOOD INLET PROTECTION FOR STORM ,DRAIN UNDER CONSTRUCTION
NOT TO SCALE
C ~
C ~ Steel Fence
i Post ~
Upstream End r
of Storm Drain
~ S nthetic iner y L such os
° NAG C350, ~ Synthetic Liner such as 2,0 P 1'35' ry 1,59' NAG C350. ~ Synthetic Liner such as
_ P b.0' , P P 2,5° 1.6 NAG C350. such as ~ . ~ ~ . ,,`1
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J 1 2.5' i.55° -NAG 0350.
2 ~ 2 _ J 1' Hardware Cloth
NOT TO SCALE 4 m.___ NOT TO 5 , ~ CALF - Washed Stane Filter
NOT TO SCALE Across Pipe :Inlet
c L °`I9
CL -STONE FILTER INLET PROTECTION FOR STORM DRAIN UNDER CONSTRUCTION
i --____W__._ DATE
i I i OCT. 5, 2004
. ~7 Synthetic Liner such as _ _ _ SCALE
Synthetic liner such os _ _ _ = 0.63° NAG C350. - 9.5 J P 1.5' 0.89' NAG C350, - - - N/A _ ,
J J _ Not to Scale DRAWN BY
2 4 2 ¢ NOT TO SCALE DWM
NOT TO SCALE
t3.9` DRAWING FILE
CONST
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O - L _ . _ _ _ . _ _ - tti
TOP .OF DAM ~ 194,93 0.63 EMERGENCY
„ SPILLWAY ~ 194,30
® S nthetic Liner such as 9 ~
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P 1.5 J P Q. MIRAFI 14DN ~
2 _ 2 4 ; U
Nor To scALE NOT TO SCALE RETENTION- POND _ ® _
EMERGENCY SPILLWAY CROSS SECTION
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J P 2,5° 0.65 NAG C350. J J z
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