20120280 Ver 3_Stormwater Info_20130606

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J T-6omas Engineering, Inc.
civil engineering . Planning
143 Charlotte Avenue, Suite 104
Sanford, North Carolina 27330
(919) 777 -6010 phone
www.jthomasengineering.com
License No. C -3389
May 31, 2013
Ms. Annette Lucas
NC DWQ, Webscape Unit
512 North Salisbury Street
Raleigh, N.C. 27604
Reference: Marketplace at Tramway— Revisions to Approved SWM Plan (12 -0280)
Lee County, North Carolina
Dear Annette:
Please find enclosed for your review one (1) copy of the revised Stormwater Management
(SWM) Plans and Computations for the Marketplace at Tramway (12 -0280). The SWM plans
have been revised because the Owner recently purchased additional property (approximately
six (6) acres) adjacent to the project site that is better suited for the BMP wet detention pond
location. The revised plans show the BMP wet detention pond in this new location. Also, the
total impervious area shown on the SWM plan increased slightly due to some additional parking
added where the BMP wet detention pond was originally sited (however the % impervious has
decreased from the original plan due to the increased site area). The revised Impervious Area
Summary is also enclosed.
If you require any additional information, please contact me at your convenience. Thank you
for your assistance on this project.
Sincerely,
J Thomas Engineering, Inc.
z ;4.
Jeremy R. Thomas, P.E.
President
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MARKETPLACE AT TRAMWAY STORMWATER MANAGEMENT PLAN
STORMWATER MANAGEMENT PLAN
2/1/2012 ( *REV MAY 2013 *)
IMPERVIOUS AREA SUMMARY
TOTAL SITE AREA:
IMPERVIOUS AREAS (PER SITE PLAN)
BUILDINGS
ROADS / PARKING
TOTAL IMPERVIOUS AREA:
PERCENT IMPERVIOUS AREA:
MAX. IMPERVIOUS AREA ALLOWED PER ZONING
51.0 AC +/-
250,000 SF
1,070,000 SF
1,320,000 SF
59%
80%

Stormwater Management Computations
BMP Design
MARKETPLACE AT TRAMWAY
Sanford, North Carolina
FEBRUARY 2012
*REVISED MAY 2013*
Prepared by:
Thomas Engineering, Inc.
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civil engineering • planning 27 c
143 Charlotte Avenue, Suite 104
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Sanford, North Carolina 27330 'df Yd.
(919) 777 -6010 phone
www.jthomasengineering.com /
License no. C -3389

Permit No.
(to be provded by DWQ)
��� \o��F W A
T F9O�r
y
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WET DETENTION BASIN SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along wdh all of the required information.
I. PROJECT INFORMATION
107,535 ft OK
Project name
MARKETPLACE AT TRAMWAY
Contact person
JEREMY R THOMAS, P E
Phone number
919 - 777 -6010
Date
May -13
Drainage area number
1
II. DESIGN INFORMATION
fe
Site Characteristics
to
Drainage area
2,001,750 le
Impervious area, post -development
1,320,000 ft
% impervious
65.94%
Design rainfall depth
1.0 in
Storage Volume: Non-SA Waters
Minimum volume required
107,535 ft OK
Volume provided
115,198 fe
Rational C, pre - development
OK, volume provided is equal to or in excess of volume required,
Storage Volume: SA Waters
( unitless)
1.5" runoff volume
N/A fe
Pre-development 1 -yr, 24-hr runoff
fe
Post-development 1 -yr, 24-hr runoff
fe
Minimum volume required
to
Volume provided fe
Peak Flow Calculations
Is the prelpost control of the 1yr 24hr storm peak flow required?
N (Y or N)
1 -yr, 24-hr rainfall depth
in
Rational C, pre - development
(unitless)
Rational C, post - development
( unitless)
Rainfall intensity. 1 -yr, 24-hr storm
in/hr
Pre - development 1 -yr, 24-hr peak flow
NIA fe /sec
Post - development 1 -yr, 24-hr peak flow
NIA fe /sec
Pre/Post 1 -yr, 24-hr peak flow control
#VALUE! fe/seC
Elevations
Temporary pool elevation
476.00 fmsl
Permanent pool elevation
474.30 fmsl
SHWT elevation (approx. at the perm. pool elevation)
frost
Top of 1Oft vegetated shelf elevation
474.80 fmsl
Bottom of 1Oft vegetated shelf elevation
473.80 fmsl Data not needed for calculation option #1, but OK if provided.
Sediment cleanout, top elevation (bottom of pond)
469.00 fmsl
Sediment cleanout, bottom elevation
468.00 fmsl Data not needed for calculation option #1, but OK if provided.
Sediment storage provided
1.00 ft
Is there additional volume stored above the state - required temp. pool?
N (Y or N)
Elevation of the top of the additional volume
fmsl
Form SW401 -Wet Detention Bas"ev 8-0/17109 Parts 1.811. Design Summary, Page 7 of 2

11. DESIGN INFORMATION
Surface Areas
Area, temporary pool fe
Area REQUIRED, permanent pool 60,053 fe
SAIDA ratio 3.00 ( unitless)
Area PROVIDED, permanent pool, Ap„_„i 62,057 fe OK
Area, bottom of 1Oft vegetated shelf, Ab,, ,hg 47,559 fe
Area, sediment cleanout, top elevation (bottom of pond), A)o,-p-d 35,772 fe
Volumes
Volume, temporary pool 115,198 fe
Volume, permanent pool, Vp,,, ,,, 269,443 fe
Volume, forebay (sum of forebays if more than one forebay) 51,892 fe
Forebay % of permanent pool volume 193% %
SAIDA Table Data
Design TSS removal
Coastal SAIDA Table Used?
Mountain/Piedmont SAIDA Table Used?
SAIDA ratio
Average depth (used in SAIDA table):
Calculation option 1 used? (See Figure 10 -2b)
Volume, permanent pool, Vp rm_pw
Area provided, permanent pool, Ap,,,_P,,,
Average depth calculated
Average depth used in SAIDA, d„„ (Round to nearest 0.5ft)
Calculation option 2 used? (See Figure 10 -2b)
Area provided, permanent pool, Ap,,,_p,,,
Area, bottom of 10ft vegetated shelf, Ab„ snerc
90%
N (Y or N)
Y (Y or N)
3 00 (unitless)
Y (Y or N)
269,443 fe
62,057 ft'
4.34 ft
4.5 ft
N (Y or N)
62,057 fe
47,559 ff
Area, sediment cieanout, top elevation (bottom of pond), Abo_p a 35,772 fe
"Depth' (distance btw bottom of 1Oft shelf and top of sediment) 480 It
Average depth calculated ft
Average depth used in SAIDA, d,,,, (Round to nearest 0.5ft) ft
Drawdown Calculations
Drawdown through onfice?
Diameter of orifice (if circular)
Area of orifice (if- non - ircular)
Coefficient of discharge (CD)
Driving head (H,)
Drawdown through weir?
Weir type
Coefficient of discharge (C„,)
Length of weir (L)
Driving head (H)
Pre - development 1 -yr, 24-hr peak flow
Post - development 1 -yr, 24-hr peak flow
Storage volume discharge rate (through discharge orifice or weir)
Storage volume drawdown time
Additional Information
Vegetated side slopes
Vegetated shelf slope
Vegetated shelf width
Length of flowpath to width ratio
Length to width ratio
Trash rack for overflow & orifice?
Freeboard provided
Vegetated filter provided?
Recorded drainage easement provided?
Capures all runoff at ultimate build -out?
Drain mechanism for maintenance or emergencies is:
y (Y or N)
6.00 in
in
0.60 ( unitless)
1.45 ft
WA (Y or N)
( unitiess)
( unitiess)
ft
ft
NIA ft'Isec
NIA ft' /sec
0.65 ft'Isec
2.05 days
OK
OK
OK
OK
OK, draws down In 2 -5 days.
Permit No.
(ro be provided by DWQ)
3 .1
OK
10 :1
OK
10.0 ft
OK
3 :1
OK
15-1
OK
Y (Y or N)
OK
Y ft
OK
N (Y or N)
OK
Y (Y or N)
OK
Y (Y or N)
OK
POND DRAIN AT BOTTOM OF RISER
Form SW401Met Detention BashAev 8- 9/17/09 Parts I & 11 Design Summary, Page 2 of 2

MARKETPLACE AT TRAMWAY
STORMWATER MANAGEMENT PLAN
May -13
POND STAGE - STORAGE TABLE
BMP 01
MAIN POND
ELEVATION (FT)
AREA (SF)
INC. VOLUME (CF)
CUM. VOLUME (CF)
BOTTOM
469
35,772
0
0
470
38,120
36,946
36,946
471
40,525
39,323
76,269
472
42,986
41,756
118,024
473
45,504
44,245
162,269
474
49,300
47,402
209,671
PERM POOL
4743
51,957
15,189
224,860
475
57,069
38,159
263,019
TEMP POOL
476
59,888
58,479
321,497
477
76,702
74,109
395,606
478
80,103
78,403
474,008
479
85,559
82,831
556,839
TOP OF BERM
480
88,929
87,244
644,083
FOREBAY
BOTTOM
469
6,640
0
0
470
7,276
6,958
6,958
471
7,938
7,607
14,565
472
8,626
8,282
22,847
473
9,339
8,983
31,830
474
10,076
9,708
41,537
PERM POOL
474.3
10,100
3,026
44,563
475
10,838
7,328
51,892
TEMP POOL
476
11,627
11,233
63,124

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,; r� r � � � CONSTRUCTION IN ITS DRAINAGE AREA. ONCE CONSTRUCTION IS COMPLETE AND THE GROUND
\ / i civil engineering planning
COMPLETELY STABILIZED WITH GROUND COVER, THE BASIN SHALL BE CLEANED OF ACCUMULATED vg
--� •
\x \ ; \ / f ( + SEDIMENT AND AND INTERIOR SLOPES FINE GRADED WHEN CONVERTING THE SEDIMENT BASIN TO
THE PERMANENT WET DETENTION BASIN. THE VEGETATED SHELF SHALL NOT BE FINE GRADED OR
PLANTED UNTIL THE SEDIMENT BASIN IS CONVERTED TO THE PERMANENT WET DETENTION BASIN.
.- 1 � � ' LPN ., � ,• ` `\ , \ ` , � °;;� • ..
:. J, ! 143 Charlotte Avenue Suite 104
- - �✓' \ . \ \\ j ! f ( ONCE THE POND IS CONVERTED TO THE PERMANENT BMP, ANY DISTURBANCE IN THE UPSTREAM
I.._. - Me , f Sanford North Carolina 27330
/ Vm - -- - Mp J } _ DRAINAGE BASIN MUST BE TREATED BY AN APPROPRIATE EROSION CONTROL MEASURE.
f
919 777 -6010 hone
2. CONTRACTOR TO VERIFY DIMENSIONS AND ELEVATIONS TO ACTUAL FIELD CONDITIONS PRIOR TO } p
F
,.� ..,,. \ .. .� ;; �_ _ ,., �� �� ... , ': t; , � , � -- - -- CONSTRUCTION. (9 9} 7 fax
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3. THE BERM CORE SHALL BE CONSTRUCTED FROM GOOD CLAY MATERIAL AND COMPACTED TO 95% www.jthomasengineering.com
\ \ I -_ _ __- -. -- OF THE MATERIALS MAXIMUM DRY DENSITY. license no. C -3389
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_, �- ,,,r I + 4 CONTRACTOR TO PROVIDE STRUCTURAL DESIGN OF REINFORCED CONCRETE RISER
46
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5. CONCRETE PIPE USED FOR THE BARREL SHALL HAVE O-RING GASKETS INSTALLED TO CREATE
\ -
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WATERTIGHT JOINTS.
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\.8 6. THE STRUCTURAL DESIGN OF ANY RETAINING WALLS USED TO CREATE THE WET DETENTION POND .�
\ \o Top t
- �.:.. = � / ,.-�.. --�. ._ e � ._ �\ � .. _ __ - . _ \ � '� SHALL BE PROVIDED BY THE CONTRACTOR.
\ \ F�._,\ H EXACT LOCATION OF E EMERGENCY LW IDENTIFIED 3
_ `._, . _ - __ _:.: •. . 7. THE E C OCA I TH E GE Y SPIL AY SHALL BE I E FIED IN THE FIELD. THE
�, - / ! / s �� ,\ \ \ \. �\\ \\ \\ CLASS I STONE
/, /
\ \ ` 1 \ / \
_ \ ; - `_. ENTIRE BOTTOM WIDTH OF THE SPILLWAY SHALL BE PLACED IN CUT.
8. FILTER FABRIC SHALL BE PLACED UNDERNEATH ALL RIP RAP. k. 77
9. SEED POND BERM AND SLOPES WITH CENTIPEDE GRASS OR FESCUE.
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10. SEE SHEET C5 FOR THE DETAILS ON PLANTING THE VEGETATED SHELF. •a y
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COf e:.CRETE
',ARREL
RISER / I \ \ \ �� \ \ \ LEVEL PORTION CONTROL SECTION
\ \ APPROACH PROFESSIONAL ENGINEER'S SEAL
(P. SP[LWAY) \ \� \\ \` ` \\ CHANNEL
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\\\A \ - -- - - --
°�' \ \ Q) / / / / � \- � - \ FLOW
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WET DETEN LION BASIN.. I y
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NOTE:
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NEITHER THE LOCATION NOR
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BERM
}\ i ✓ i c9,� i e ✓ / \ \ \ \\ ` \ \ f/ `\ \ i��. �.............. ..... ®— �M�N OI'4TROL
\ ALIGNMENT OF THE C
�p.S SECTION HAS TO COINCIDE _
\\ i \ \ \ / /% \ \ \ \ Y%✓ i -% / ,. / gMP EMBANKMENT
� EMBANKMENT
WITH THE CENTERLINE CF THE
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DAM.
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PLAN
\ \ NX
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\\ \ \� \ \ , A(�i / i EGE LINE EMERGENCY SPILLWAY WITH
\ PERMANENT TURF REINFORCEMENT MATTING WATER
SURFACE _
BERM ,a CONTROL SECTION
-----------------------
/ �✓ GG� FREEBOARD 1 MIN
FOREBAY \ \ \ \ \ \\ \�\,.. \ , /--� �/ P
✓ � ' / � ` \, \ \\ \ \ \ � � ` ` ( ) �
\ \ ` t \ \� P ! / SPILLWAY INVERT ELEV - - - -- -. i EXIT SECTOR /�/ C�
° x ' i��, > SEE PLANS FOR LINER LENGTH
ii
EXTEND LINER 1' BELOW �< �l V
I -r r
BOTTOM E E VEO
100 S-1 "k
CITY OF \ \ \ \ \ \ L
GREATER
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' APPROACH PROFILE ALONG CENTERLINE
ry
CHANNEL "
_ S. \, \ \\
W
OEM (-
WATER TOWED 4 1�.�u_
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RIP RAP LINED � �-Ti>� ����11 -"
U =\ I� i 't�I C�t>J'
itI I(1r, -1115 lit r l.l_In fill l ll Ir 1 \tom _ill l III,_ ''
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25' —i Milli 0
- CROSS SECTION AT CONTROL SECTION
L6 V 1
TYPICAL EXCAVATED EARTH SPILLWAY
NTS
N MOO t / J =,0 �u� I E N V „�. A �\ � ALUMINUM GRATING ce
DRAIN VALVE OPENING
M C C O L U M MECHANISM
TEMPORARY POOL -
50 0 25 50 100 �_, 18— �I 6"
6_fd OUTLET ORIFICE
SCALE: 1"=50' SCALE: 1" = 50' �+.r - - 6 0 CUTLET
— — PERMANENT POOL V ORIFICE
ALUMINUM CAGE
FASTENED TO WALL ALUMINUM CAGE W REVISIONS
CENTER ON ORIFICE FASTENED TO WALL
2" X 2" OPENINGS CONCRETE RISER FACE 2" X 2" OPENINGS U
z
O
v
30 MAY GATE VALVE 2013: RELOAT -10th OF M S PO D, CHANIGEl
W/ G
12" } POND DRAIN DIP PROJECT AREA, AND IMPERVIOUS AREA
-
FRONT VIEW SIDE VIEW
TYPICAL ORIFICE OUTLET CONFIGURATION
NTS
ALUMINUM HINGES
REINFORCED CONCRETE RISER
5.5'x 5.5' (I.D.)
r d TOP WIDTH
HANDLES (2) �_� �_ - - -- C/L
HEAVY DUTY ALUMINUM GRATING (350 LB /FT ^2 RATING) _ _
APPROX. 3" X 3" OPENINGS \• \ 1� VEGETATED SHELF �I I TOP OF BER , EL = 480.0
STEPS I ENDWALL WITH WINGWALLS
10'______ -_ (FRAME AND GRATE SECURELY FASTENED TO BOX) � I -�
VEGETATED SHELF PROVIDE HINGE, HANDLES, AND LOCKING MECHANISM \ ' ( (NCDOT STANDARD PRECAST STRUCTURE)
INFLOW SWALE / PIPE - \
\ \ EMERGENCY SPILLWAYLEL = 478.0_
TOP CF FOREBAY BERM
7 EL = 476.0 i TE,14PORARYPOOL, EL -476.0 FILTER DIAPHRAGM 3 1 MqY
---- -,m — ®— ------------- - - - - -- P - - --
j ORIFICE ( ( —i (CONCRETE T THICK)
— — EARTHEN DAM
10:1 — — —I — PERMS' (VENT POOL, EL = 474.3 p
SEASONABLE HIGH — — — — — — — — — — — — — — — — I REINFORCED I AGENCY REVIEW ONLY
V,ATER TABLE 3:1 /N RISER
AX I „)
FOREBAY BOTTOM, EL = 469.0 POND BOTTOM, EL = 469.0 IN I I INV IN EL = 469.0 64 LF 48" RCP BARREL @ 1.6%
--------- - - - - --
SEDIMENTSTORAGE - R. CONCRETE BASE INV OUT Scale Drawn b
EL = 468.0 E L = 468.0 y'
�` ®®
SEE .SCALE BAR JRT
NOTE: JOINTS SHALL BE WATERTIGHT \ \ \
THE BIiP SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE CONSTRUCTION SPECIFICATIONS PROVIDED IN 8':ri 8'X 1.5' REINFORCED CONCRETE BASE (O -RING GASKETS) \ `., Sheet: Designed by;
NCDWu1STORMWATER BEST MANAGEMENT PRACTICES MANUAL, DATED JULY 2007. ` 2" PVC DRAIN
KEY TRENCH
(NON- PERFORATED) RIP RAP OUTLES'PROTECTION JRT
(3' BELOW EX. GROUND, 5' INSTALL PERFORATED PVC Reviewed by:
WIDE AT BOTTOM) CAP AT EACH END OF PVC 2" PVC DRAIN
T DETENTION PON ® SECTION EXTEND FILTER T AROUND SIDES DRAIN PIPE [�'N OUT ELEV = 467.0 Of JRT
OF PIPE AND 1 ABOVE TOP AND Project Number: Date:
NTS BELOW BOTTOM OF PIPE
11 -007 FEB 2012
i

I=
SHELF TOP
WATER SURFACE
SHELF BOTTOM
WIVINY
50."TYPI-CAL------------
REPEAT PATTERN ALONG ENTIRE SHELF
wllli�,1111�
SYMBOL
BOTANICAL NAME
COMMON NAME
MATURE SIZE
CONT. SIZE
SPACING
EMERGENT PLANTS (SHALLOW WAjY'9)--
JbAf.
4�
1w
PELTANDRA VIRGINICA
ARROW ARUM
18-24" HT.
LARGE PLUG
36"
SA ITTARIA LATIFOLIA
DUCK POTATO
12' -18' HT.
LARGE PLUG
36"
PONTEDARIA CORDATA
PICKERLWEED
12-18" HT.
LARGE PLUG
36"
HERBACEOUS PLANTS (SHALLOW UTZ)
HIBISCUS MOSCHEUTOS
MARSH HISBISCUS
36-72" HT. 24-36" W
TUBELING
36"
0
MIMULUS ALATUS
MONKEYFLOWER
18-24" HT.
LARGE PLUG
36"
IRIS VIRGINICA
BLUG FLAG IRIS
18-36" HT.
LARGE PLUG
36"
PLANTING DETAILS - VEGETATED SHELF
NTS