SW7061212_HISTORICAL FILE_20061211

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW�
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
ISTORICAL FILE
DOC DATE
DLa /a
YYYYMMDD

ARA
NCDENR
North Carolina department of Environment and Natural Resources aY�rC-t t�
943 Washington Square Mail, Washington NC 27889 [phone] FAX [phone],I, �E�
Request for Express Permit Review DEC 1 1 2006
FILL-IN all information below and CHECK required Permit(s).
1l1"- yq�n
Please include this with the application package upon submittal. Project application received-aiter02 noon�uvll�l be
stamped in the following work day. Thank you! Lyn Hardison lyn.hardlson(cD,ncmall.net
APPLICANT Name Nelson W. smith -Superintendent
Company Tyrrell County Board of Education
Address 210 N. Road Street City/State Columbia, NC Zip 27925
Phone [phone] Fax I Email
PROJECT Name Tyrrell County Middle School County Tyrrell
PROJECT LOCATION (ADDRESS) 920 Main street
ENGiNEER1CONSULTANT Robert S. Bartlett
Company Bartlett Engineering 8 Surveying, PC
Address 1906 Nash Street North City/State Wilson, NC Zip 27893
Phone [phone] Fax [phone] Email [e-mail]
State or National Environmental Policy Act (SEPA, NEPA) — EA or EIS Required []Yes 0 No
❑ STREAM ORIGIN Determination; # of Stream calls; Stream Name
© STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other
❑ Low Density -Curb & Gutter © High Density -Infiltration ❑ Off Site
PROJECT SYSTEM(S) TRIBUTARY TO UT to scuppernong River STREAM NAME Pasquotank RIVER BASIN
❑ COASTAL ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information
MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
------- ------- —---------- ------- ----------- -------- —-------- ---------- ------ ----- ------------ ------------- ---------- —---------- --------------- ----- -------------
[] LAND QUALITY x❑ Erosion and Sedimentation Control Plan with 2.0 acres to be disturbed. CK # 6a� ,
❑ WETLANDS (401) ❑ No Wetlands on Site (letter from COE) ❑Wetlands Delineated/No JD '
❑ Greater than 0.1 AC Wetlands Impacted ❑Jurisdictional Determination has been done
❑ Less than 0.1 AC Wetlands Impacted ❑Greater than 0.5 AC Wetlands Impacted
CIRCLE YIN: 401 Application ❑Yes ❑ No 404 Application in Process MUSCOE ❑Yes ❑ No
The legislation allows additional fees, not to exceed 50% of the original Express Review permit application
fee, to be charged for subsequent reviews due to the insufficiency of the permit applications.
CHECK # ` For DENR use only
�� �- � -1
SUBMITTAL DATES: Fee Split for multiple permits:
SW lam $ 3 s�154�
CAMA $
LQS f-,�l ` I,( O $
401 $
Total Fee Amount $ 4CU 0

BIORETENTION AREA -DESIGN CALCULATIONS
INCHES RUNOFF 1.00
RUNOFF VOLUME (CUBIC FEET)=AREA*RUNOFF DEPTH
DRAINAGE AREA (SQ FEET) 32813
STORAGE NEEDED CU FEET 2734
STORAGE PROVIDED CU FEET 3034
STORAGE DEPTH= 9 INCHES
BIORETENTION AREA NEEDED 3646
BIORETENTION AREA PROVIDED 3654 SQUARE FT (ELEV. 3.0')
BIORETENTION AREA/VOLUMES
AREA
INCR. VOL
CUMM. VOL
ELEV.
(SQ.FT.)
(CU.FT.)
(CU.FT.)
3.0'
3654.2
0
0
3.25'
3912.8
946
946
3.5,
4177.4
1011
1956.8
3.75'
4448
2023.7
3034.8
ASSUME PERMEABILITY OF 1 INCH/HOUR AND A FILL SOIL LAYER OF 2 FT THICK
qp 1.375 INIHR PER UNIT AREA
Drawdown Time 6.5 HRS TO BOTTOM SURFACE (3.0')
24.0 HRS TO DROP 2' BELOW BOTTOM SURFACE (1 .0')
Q (qp x area) 0.12
Q (10 X MINIMUM) 1.2 CU FT/SEC
USING MANNING'S EQUATION (N x D=16 x (Q x n Iso.5 )0.375)
N x D= 9.224788774 INCHES (AREA= 66.80 SQUARE INCHES)
6 INCHES (AREA= 28.26 SQUARE INCHES)
8 INCHES (AREA= 50.24 SQUARE INCHES)
THEREFORE, USE THREE 6 INCH DIAMETER UNDERDRAINS IN THE GRAVEL LAYER
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0 0.09 0.18 0.27 0.36 0.45 mi REUIIEW ED
Map center is 350 55` 09"N, 760 14` 46"W (WGS84/NAD83)
Columbia East quadrangle DEC 1 7 2006 M--10.539
Projection is UTM Zone 18 NAD83 Datum G--p, 731
http://www.topozone.com/print.asp?z=18&n-3975712&e=387574&s=25&size=l&u=6&dat... 8/1 /2006

re�
. DE
511-MM
December 1, 2006
Washington Regional Office
Department of Environment
and Natural Resources
Attn: Scott Vinson
943 Washington Square Mall
Washington, NC 27889
BARTLETT
ENGINEERING & SURVEYING, PG
1906 Nash Street North Wilson, NC 27893-1726
Phone: [phone] Fax: [phone]
[e-mail]
REFERENCE: STORNRVATER NARRATIVE-COI..UMBIA FIS/MS GYMNASIUM ADDITION
Dear Mr. Vinson:
The 16.19 acre school site consists of an unknown amount of existing impervious area. The existing 17,197 SF
gymnasium will be demolished and replaced with a new gymnasium and sidewalks consisting of 30,772 SF for a
net proposed impervious area of 13,575 SF or a 1.92% increase of built upon area. A proposed bioretention
area designed in accordance with the NC BMP manual will treat runoff collected from roof drains and
transported to the bio-retention area by two 12"pvc pipes from each side of the building. The existing ground
level of 2.Oft will be built up to a finished floor elevation of 5.2ft. The temporary pool elevation will be at
3.75ft with a planting elevation of 3.0ft (9" of storage) and a bottom elevation of 1-Oft with under drains. Fill
material used in the construction of the bio-retention area will consist of loamy sand with an infiltration rate of
at least 1"/hr. The soil type/infiltration rate of the In -Situ soil was not investigated since under -drains would
be used to discharge treated stormwater from the bio-retention area to a storm drainage system. Sheet flow
and a grassed buffer strip were not utilized at the inlet to the bio-retention facility since roof downspouts will
be piped to the area and due to the accessibility of the proposed gymnasium and adjacent structures.
If you have any questions or need additional information, please contact our office. Thank you.
Sincerely,
i
Environmental Specialist
Enclosure