20080308 Ver 1_Stormwater Site Plans_20080214

LINE TABLE
LINE
LENGTH
BEARING
L1
446.23
S12'48'S4 "W
L2
301.82
N00'49'31 "W
L3
106.55
S01'01'21 "E
L4
1575.44
S88'20'28 "W
L5
383.87
N02005'51 "E
L6
249.83
S01019'32 "E
L7
285.44
N88`30'45 "W
CURV
TABLE
DELTA TANGENT CHORD
CURVE
LENGTH
RADIUS
Cl
206.53
1514.99
7'48'39"
103.43
206.37
C2
184.30
1629.38
6'28'51"
92.25
184.20
C3
359.88
5336.92
3'51'49"
180.01
359.81
C4
455.09
6244.81
4'10'31"
227.64
454.99
C5
233.47
4811.25
2.46'49"
116.76
233.44
C6
336.56
5860.24
3.17'26"
168.32
336.51
C7
154.14
1514.99
5.49'46"
77.14
154.08
C8
424.03
5860.24
4.08'45"
212.11
423.94
C9
41.62
5860.24
0.2425"
20.81
41.62
C10
319.92
820.00
22.21'15"
162.02
317.90
C11
714.68
5322.97
7'41'33"
357.87
714.13
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THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
HQRZ SCALE:
CM-ENGINEERING
PUBLIC WORKS- ENV. PROGRAMS
DATE
VERT SCALE:
M- TRANSPORTATION
DATE
PLANNING
DATE
DRAWN BY: ACL
CHECKED BY: FDR
CM-BUILDING I
- TRANSPORTATION
DATE7-
DATE: 1-31-08
PUBLIC WORKS- WATER /SEWER
DATE
FIRE
A
PROJECT NO.
12070308A Cl
PUBLIC WORKS-ELECTRIC
A RKS, RECREATION &
DATE
CULTURAL RES.
SHEET NQ,
. C -1.3
PUBLIC WORKS-S&E
DATE
SHEET OF

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15 .
. GENERAL NOTES:
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GREY AREAS SHOWN INSIDE BOUNDARY
OF PROPERTY REPRESENT RCA
20' TYPE "B"
N /F
LEE BARFIELD & LEE W. SMITH
DB 4715 - PG 226
PIN: 0742995139
N /F
GREGORY P. & GLENDA C. MILLS
DB 2060 - PG 679
PIN: 0752093579
N /F
PRIYAVADAN M. & HARSHA P. SHAH
DB 3458 - PG 704
PIN: 0742998270
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GREY AREAS SHOWN INSIDE BOUNDARY
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20' TYPE "B"
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DB 4715 - PG 226
PIN: 0742995139
N /F
GREGORY P. & GLENDA C. MILLS
DB 2060 - PG 679
PIN: 0752093579
N /F
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DB 3458 - PG 704
PIN: 0742998270
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GENERAL NOTES:
1) NO SITE DEVELOPMENT ACTIVITY INCLUDING BUT NOT LIMITED TO TESTING,
CLEARING, INSTALLATION OF S &E MEASURES, OR GRADING, SHALL OCCUR
UNTIL REQUIRED PROTECTION FENCING HAS BEEN INSTALLED AND
. INSPECTED. A PROTECTION FENCING INSTALLATION PERMIT MAY BE
OBTAINED AT THE PLANNING DEPARTMENT OR BY CALLING (919)
249 -3426.
2) PROTECTION FENCING MUST BE PLACED AWAY FROM ANY SAVED TREE
ONE FOOT FOR EACH INCH OF TREE CALIPER. PROTECTION FENCING
MUST BE PLACED AT LEAST 10 FEET AWAY FROM ANY OTHER DESIGNATED
RESOURCE CONSERVATION AREA, SUCH AS BUT NOT LIMITED TO HISTORIC
BUILDINGS AND STRUCTURES, WETLANDS, AND PONDS. PROTECTION
FENCING MUST BE PLACED ALONG THE OUTSIDE LINE OF THE 100 -YEAR
FLOODPLAIN, AND THE OUTSIDE EDGE OF ANY RIPARIAN BUFFER. V)
ADDITIONAL PROTECTION FENCING MAY BE REQUIRED IN OTHER LOCATIONS z
CLOSE TO CONSTRUCTION ACTIVITY WHERE IT IS DEEMED NECESSARY BY O
THE ZONING ENFORCEMENT OFFICER; SUCH AREAS MAY INCLUDE BUT ARE
NOT LIMITED TO COMMON PROPERTY LINES OR NEAR PUBLIC AREA V)
(SIDEWALKS, ETC.)
3) ALL GRADING AND SUPPORT STRUCTURES ASSOCIATED WITH ANY W
RETAINING STRUCTURE SHALL NOT ENCROACH INTO ANY REQUIRED BUFFER ry 1­1
OR PROTECTED AREA (SUCH AS BUT NOT LIMITED TO, RCA AND CRITICAL U-
ROOTS ZONES OF TREES, PUBLIC UTILITY EASEMENTS AND 4-'
RIGHTS -OF -WAY, AND SHALL BE CONTAINED ENTIRELY ON SITE. Q
4) SITE ELEMENTS REQUIRED TO SATISFY RECREATIONAL REQUIREMENTS SUCH u
AS BUT NOT LIMITED TO PLAY FIELDS AND GREENWAY TRAILS AND ITEMS �
TYPICALLY ASSOCIATED WITH THEM (BENCHES, TRASH CONTAINERS, SIGNS, o
ETC.) MUST MEET ANY APPLICABLE STANDARDS FOUND IN THE TOWN OF U
APEX STANDARD SPECIFICATIONS AND CONSTRUCTION DETAILS AND THE z CK
0
REQUIREMENTS OF THE TOWN OF APEX PARKS AND RECREATION a_
DEPARTMENT. x °
w
5) RETAINING SYSTEMS PROVIDING A CUMULATIVE VERTICAL RELIEF GREATER a 0 0
THAN FIVE FEET IN HEIGHT WITHIN A HORIZONTAL DISTANCE OF 50 FEET 0
OR LESS, INCLUDING RETAINING WALLS OR MECHANICALLY STABILIZED Co
EARTH WALLS SHALL BE DESIGNED AND CONSTRUCTED UNDER THE o
RESPONSIBLE CHARGE OF A REGISTERED PROFESSIONAL ENGINEER AND < en
. COMPLY IN ALL ASPECTS WITH THE NC BUILDING CODE SECTION 1610. !
RETAINING SYSTEMS MEETING THIS CRITERIA WILL REQUIRE A SEPARATE
BUILDING PERMIT PRIOR TO START OF WORK. 0
6) ALL STORMWATER WET PONDS TO FUNCTION AS A TEMPORARY SEDIMENT o
BASINS DURING THE CONSTRUCTION PHASE. x
7) SELECT GRADING OF THESE INDIVIDUAL LOTS IS PROPOSED SO THAT THE a-.-
BUILDING SITES FOLLOW THE NATURAL TOPOGRAPHY OF THE OVERALL
SITE. ADDITIONAL GRADING MAY BE REQUIRED AT CONSTRUCTION PLAN
PHASE.
y A. LOTS 8,000 SQUARE FEET OR GREATER SHALL INSTALL LARGE TYPE CA
TREES WITH A MINIMUM 2 J" CALIPER AT INSTALLATION. EACH LOT a
SHALL BE SUPPLEMENTED WITH A MINIMUM OF 2 EVERGREEN SHRUBS, cto
2 DECIDUOUS SHRUBS, ONE EVERGREEN TREE, ONE DECIDUOUS TREE o
TO BE PLANTED IN THE FRONT, REAR OR SIDE YARD. :�
N
B. LOTS LESS THAN 8,000 SQUARE FEET IN SIZE SHALL INSTALL SMALL v
4.4
TYPE TREES WITH A MINIMUM 1 j" CALIPER AT INSTALLATION. EACH 91-I4 •o -W-0
LOT SHALL BE SUPPLEMENTED WITH A MINIMUM OF 4 EVERGREEN Cid t u�
SHRUBS, 4 DECIDUOUS SHRUBS, 2 EVERGREEN TREES & 2 DECIDUOUS . 0 g r,
TREES TO BE PROVIDED IN THE FRONT, REAR OR SIDE YARD. .-I Ln �
C. A UNIFIED THEME ALONG STREET OR SECTIONS OF STREETS MUST BE o +.4
DEMONSTRATED AN THE SITE PLAN, BUT DIVERSE SPECIES OF PLANT U u
MATERIAL MUST BE USED THROUGHOUT THE DEVELOPMENT. u • U
- ,14
8) ALL VALVE BOXES & COVERS, STORM DRAINAGE GRATES & MANHOLE T4 .En m;- 0
COVERS SHALL MEET ASTM A48, GRADE 35B IRON REQUIREMENTS. � •.� E
9) THIS SITE IS LOCATED IN THE PRIMARY WATERSHED OVERLAY DISTRICT. O 0
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NOTES: A GRADING PERMIT FROM THE BUILDING INSPECTION DIVISION IS REQUIRED PRIOR TO ¢ °
ANY GRADING ON THE SITE IN CONFORMANCE TO THE NC BUILDING CODE APPENDIX J U �.
I =
(GRADING). THE BUILDING PERMIT APPLICATION SHALL LIST THE GRADING CONTRACTOR En
AND SOILS FIRM OR INSPECTOR RETAINED TO OVERSEE THE SOILS COMPACTION ON THE Q o
SITE IN CONFORMANCE TO CHAPTER 17 OF THE NORTH CAROLINA STATE BUILDING CODE.
DAILY REPORTS BY THE SOILS INSPECTOR SHALL BE MADE AVAILABLE TO THE BUILDING
• OFFICIAL UPON REQUEST. THE COMPLETED FINAL SOILS REPORT SHALL INCLUDE THE U
INFORMATION REQUIRED BY SECTION 1801 THROUGH SECTION 1803 ALONG WITH A PLOT z
MAP LOCATING ALL TESTS SITES AND THE LIMITS OF THE COMPACTED FILL AREAS. THIS
REPORT MUST BE PRESENTED TO AND ACCEPTED BY THE BUILDING OFFICIAL PRIOR TO U) X
BUILDING PERMITS BEING ISSUED ON THE SITE. CONTACT JEPH ALLEN AT 247 --3379 FOR Z W
INFORMATION. CL
Q <C
LOTS DESIGNED TO RECEIVE MORE THAN 1 FOOT OF FILL ARE: 5, 49--5 79, _J U_
AND 131 -135. �} Q
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ANY PROPOSED RETAINING WALLS TO BE F"
SEGMENTAL BLOCK- -TYPE, UNLESS U) C45
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THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
W
o
Ht3RZ SCALE:
CM-ENGINEERING
DATPUBLIC
WORKS- ENV. PROGRAMS
DATE
VERT SCALE:
CM- TRANSPORTATION
DATE
PLANNING
A
IDRAWN BY: ACL
CHECKED BY: FDR
CM-BUILDING
PLANNING- TRANSPORTATION
DAT
DATE: 1-31-08
PUBLIC WORKS- WATER /SEWER
DATE
FIRE
A
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CULTURAL RES.
SHEET NO.
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' \
6 X50 TOWN OF APEX;; Q \ ( Dc �\ \ \ STORMWATER WETLANDS #1 - SIZING, CALCULATIONS, AND
REQUIREMENTS
P BLIC UTILITY EASEMENT.,;
REQUIRED VOLUME TO CONTROL THE 1" STORM
f ! \ \ \ RUNOFF COEFFICIENT (RV): STORM RUNOFF IN STORM RAINFALL
(IN)
. 0 0 \ `\ .
\, 40 PERCENT IMPERVIOUS I . DRAINAGE AREA AC IMPERVIOUS
s 39 q.\o U I ``� \ PORTION OF DA (AC.)
0 w \ \
X.
\ \ _ R V - 0.05 + .9 (1)
t -
\ CBW2 `�.. \, \ 0.05 + .9 * (4.71/10.78)
Of x CB#
\ \ `� = 0.44 IN /IN % '�;„ .,, \ \ N. REQ. VOL. FROM 1" OF RUNOFF= (DESIGN RAINFALL) * (RV)
~ ♦ ; . *` ` \
(DRAINAGE AREA)
3630 (1 ) (0.44 IN /IN) (10.78AC)
�� -.��( \ `� = 17217.82 CF
PROVIDED VOLUME FROM 1 " OF RUNOFF = 18,605 CF
±` \ '`� VOLUME PROVIDED > VOLUME REQUIRED
4
.~ \ 1...:. `t 1 \ \ \ \ `\ �..:. �\ 189605 > 17, 217.82 CF
PRIVATE""- I .Yy \_ �; \ S E T LA
EL LN .
MAINTENANCE \ I \
+
EASEMENT T `: �`� ` \ \ ``� f m ! REQUIRED SURFACE AREA FOR WETLAND
\~ . I \ \. \ \ 4 �. o a \ \ \ \
\ �/ \ 396.0a '4 . \, \ TOTAL DRAINAGE AREA TO BAISIN: 10.78 AC.
\� \ PERCENT OF IMPERVIOUS FOR DRAINAGE AREA. 43.7%
-' \ ..,-1 AVERAGE PERMANENT POOL DEPTH. 1 FT.
{, \ \* REQUIRED SURFACE AREA: SA = 179217.82 CF /1.0 FT Co
\ \ ~ REQUIRED SURFACE AREA: SA = 17,217.82 SF
~ w i \ RANAGE STRUCTURE STEPS �-OS, cj0 \ � PROVIDED SURFACE AREA: SA = 18,605 SF
STANDARD D A RGD N CD 0 T 8 4Q.6 6 -00, 36.0 0
` �""� A PROVIDED > SURFACE AREA REQUIRED
2 \ \ OREBAI�`� A
,\ �, 6 .� wS ET SURFACE AREA P 0 DED SU CE E
f
I 'IN `� \.
\ 3 .00R �.,�..v��� DEEPPOOL �"' `� �� `~- �., REQUIRED ORFICE DIAMETER FOR 2 -5 DAY DRAW DOWN
1 \ X395.75 \ -
€. TEMPORARY POOL VOLUME - 18,605 CF
402. \- HEIGHT OF TEMPORARY POOL = 1.0 FT
`� \�
0 � ..� \, SH Q LLO W WA �E R �4. •., \. 7�_� '\ � \ DRAWDOWN TIME = 2 DAYS OR 172,800 SEC
,\ 6 • a0 \ SHALL W WATER FLOWRATE = 18,605 CF 172,800 SEC = 0.108 CFS
`\ \, ,. ORIFICE COEFFICIENT 0.6
..... . \ AREA = Q C SQRT 2 *G *H
{ I SHALL W LAN D\ \ _
C \ \ / O \ \ (0.1 08/0.6)/SQRT (2) *(32.2) *(.33)
0.0394 SF
5.67 SQ IN
. STORMWATIIII,, �. \ 73
E r 50 N EU SE \ DIAMETER =SQRT AREA* 4)/P
\ \ k WE # 403. _
111 F R VER / \ = SQRT €(5.67) (4)/3.14j
I ?,. 404 39� = 2.69 INCHES
o:y REPARIAN USE 2.5 INCHES
SHALLOW LAND
f n BUFF
\ ; \ 95 \ .
.0. ,,.0 ~ ~.,� BOUYANCY CALCULATIONS
,# WEIGHT OF CONCRETE (DOWNWARD FORCE)
~ ,� ~ RISER: (2(4 x0.67) + 2(5.33x0.67 )) x 9.2 115 CF
SHALLOW WATER, + "`~~ FOOTING: 1' X 5.33' X 5.33' = 28.41 CF
z \ ~ `° GROUT: 1'X4'X4' =16 CF
DEEP POOL -- -- 395.75, CONCRETE VOLUME X CONCRETE DENSITY -
6 t
\ - = (115 CF + 28.41 CF + 16 CF) X 150 LBS. /CF
ME
23,911 LBS.
�, ����� -�,,, WEIGHT OF WATER DISPLACED (UPWARD FORCE)
S#871 `., RISER: 5.33 X 5.33 X 9.2 - 261.36 CF
\ `
RETAINING '�1(ALL
w._
- 41 CF
0-00 t \ \ �� _ _„_ -��--- WATER VOLUME X WATER DENSITY
._ ----- -�- - - + - �- �` � �``" �,. = 261.36 CF + 28.41 CF X 62.4 LBS. CF
____ -. _--- ---- -- \ `\ = 18,081.65 LBS .
\ \ ,402.00 STRUCTURE WILL NOT FLOAT
\ \
396.00
402
400 -
398
396
394 -
392 -
390 I
388
10 +00
100
�o Z#z
O 07
�Lo
N pp
O
00 Z
WF->
jw
TOP) OF BERM
ELEV: 402.00
82.43
p 1.
-- 4»
DIA RCP
RIP RAP
DISSI ATOR
STORMWATER WETLAND OUTLET STRUCTURE 11+
410
18605
SF
X
r
REQ.
REQ. SF
PROV. SF
PROVIDED
FOREBAY
10%
410
2003
10.77%
SHALLOW WATER
40%
7442
7747
408
SHALLOW LAND
30%
-------- ----- . w
408
38.78%
DEEP POOL
5 -10%
�
1640
8.81%
406
ELEV: 406.00
W
Q`J
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0
406
404
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.w .
404
402
i
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1 -YR. STORM
402
400
100 -. S
EL. 398.00
-mow.
•
-----
-7
400
LEN �_-Z
10-YR. STORtrI
'
E 99.40
398`
-
398
lz ............. w"'0000,'.00I 1 -YR. STORM
5/
EL 398.00
396
-- - - - - -- -
36" Of A RCP
D1 6
�
RCP_ •�••-•�•••�
396
- - -----------------------
---------
EEP POOL
---------- -------------
394
-
ELEV: 395.50
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.STORMWATER WETLAND # 1 - FOREBAY 'A'
SCALE: 1" = 40'H; 1" = 4'V
STORMWATER WETLANDS#1 WETLAND AREA DISTRIBUTION
TOTAL SURFACE AREA:
18605
SF
X
r
REQ.
REQ. SF
PROV. SF
PROVIDED
FOREBAY
10%
1860.5
2003
10.77%
SHALLOW WATER
40%
7442
7747
41.64%
SHALLOW LAND
30%
5581.5
7215
38.78%
DEEP POOL
5 -10%
�
1640
8.81%
STORUWATER WETLAND. #1 - PLAN N
STORMWATER WETLANDS SITE PREPARATION &GRADING
SCALE: 1" = 20'H 1. STOCKPILE AND PROTECT EXISTING TOPSOIL ON SITE (SEE STOCKPILED TOPSOIL LOCATIONS).
i DEEP POpL
ELEV: 395.50
BOTTOM OF
^,L .
ELEV=392.50
11 +00
STORMWATER WETLAND #1 - PROFILE
SCALE: 1" = 20'H; 1" = 21V
SHALLOW WATER
61.
MAX. ELE'V=396.00
12 +00
SH LLOW
LAN D
404
402
r 101SE:]
396
394
392
390
SEE DETAILED INTELLISOLVE HYDRAFLOW POND
SIZING REPORT FOR SPECIFIC INFORMATION
RELATED TO DETENTION SIZING AND SITE ROUTING
2. TEST THE TOPSOIL TO DETERMINE THE VIABILITY OF THESE SOILS AND THE AMENDMENTS (IF ANY) THAT WILL BE NEEDED.
3. UNWANTED VEGETATION IN THE STORMWATER WETLAND FACILITY AREA SHALL BE REMOVED DURING SITE PREPARATION. TREES DETERMINED TO BE
RETAINED MUST BE PROTECTED WITH ORANGE FENCING.
4. NO MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE ALLOWED WITHIN THE STORMWATER WETLAND FACILITY SITES AFTER SITE CLEARING AND
GRADING HAVE BEEN COMPLETED, EXCEPT TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS STORMWATER WETLAND BMPS.
5. THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY WITH THE EXCEPTION OF THE INTERIOR GRADING. THE INTERIOR GRADING WILL BE
CONSTRUCTED ONCE THE EROSION CONTROL PHASE IS COMPLETE.
6. ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE EROSION CONTROL INSPECTOR APPROVES THE REMOVAL OF THE SEDIMENT BASIN, THE
CONTRACTOR SHALL REMOVE THE TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. ALL SEDIMENT, TRASH, ETC., SHALL BE PROPERLY
DISPOSED OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY AFFECTED.
7. AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION CONTROL DEVICES REMOVED, THE CONTRACTOR SHALL CONSTRUCT THE INTERIOR GRADING
SHOWN ON THIS SHEET.
8. AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF ALL STORMWATER WETLAND FACILITIES INCLUDING CUT SLOPES AND FILL AREAS. THE
MAXIMUM PERMEABILITY RATE FOR THE LINER SHALL BE 0.72 CM /DAY. THE PROPOSED MATERIAL FOR THIS LINER SHALL BE TESTED BY A QUALIFIED
GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE RESULTS OF THIS TESTING SHALL BE SUBMITTED TO THE DESIGN ENGINEER FOR REVIEW PRIOR
TO PLACEMENT. THE RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE TOWN OF APEX, NC FOR APPROVAL.
9. THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN REPRESENT THE FINISH GRADE OF THE WETLAND SYSTEM.
10.ALL DISTURBED SUBSOILS SHALL BE TILLED BEFORE CAPPING WITH A MINIMUM OF 12 INCHES OF TOPSOIL. AREAS OF THE STORMWATER WETLAND
HAVING A PERMANENT POOL DEPTH OF 6 INCHES OR GREATER (E.G., THE FOREBAY AND DEEP POOL AREAS), WILL BE CAPPED WITH A MINIMUM OF 6
INCHES OF TOPSOIL. NO TILLING SHALL OCCUR WITHIN THE DRIP LINE OF EXISTING TREES. AFTER TILLING IS COMPLETED, NO OTHER CONSTRUCTION
TRAFFIC SHALL BE ALLOWED IN THE AREA, EXCEPT FOR PLANTING AND RELATED WORK.
11.STRUCTURAL BMP "AS BUILTS" WILL BE REQUIRED AND SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT APPROVAL (WITH RESPECT TO A
SUBDIVISION) OR CERTIFICATE OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP IS
CONSTRUCTED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION PLANS. AS -BUILT SURVEY REQUIREMENTS FOR THE STRUCTURAL BMP'S SHALL
INCLUDE BUT NOT BE LIMITED TO THE FOLLOWING: CONTRACTOR SHALL PROVIDE AS -BUILT TOPOGRAPHIC SURVEY PERFORMED BY A PROFESSIONAL
LAND SURVEYOR CERTIFYING STRUCTURAL BMP AREA DIMENSIONS, ELEVATIONS, INLET /OUTLET STRUCTURE INVERTS, ORIFICE DIAMETER, PIPE SIZES,
AND CLEANOUT LOCATIONS. * *IN THE CASE OF THE PROPOSED STORMWATER WETLANDS IT WILL BE NECESSARY TO PROVIDE BOTTOM ELEVATIONS FOR
THE FOREBAYS, DEEP POOLS, SHALLOW LAND, AND SHALLOW WATER ZONES **
INTERIOR WALL PROFILE NOT SHOWN
#4 BARS - WELDED IN
SYMMETRICAL PATTERN
(WITH LOCKABLE HATCH
FOR ACCESS)
N
i
5' -8"
RISER STRUCTURE
5, -4»
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I I I I
I I
1 I
I I
I
6 "0 ORIFICE
2.5 99 0 ORIFICE
3"0 ORIFICE
6"0 ORIFICE
TRASH GUARD
NOT TO SCALE
3" ORIFICE
INVERT = 397.
TOP OF RISER = 399.5 -
4-6" ORIFICE -
INVERT = 398.2
OUTLET BOX I
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FEB 14 2008
Z
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OEN�c•W?���� ,�., c �ANGN
( 1
10 -YR. STORM
1 -YR. STORM
'
EL. 398.00
i DEEP POpL
ELEV: 395.50
BOTTOM OF
^,L .
ELEV=392.50
11 +00
STORMWATER WETLAND #1 - PROFILE
SCALE: 1" = 20'H; 1" = 21V
SHALLOW WATER
61.
MAX. ELE'V=396.00
12 +00
SH LLOW
LAN D
404
402
r 101SE:]
396
394
392
390
SEE DETAILED INTELLISOLVE HYDRAFLOW POND
SIZING REPORT FOR SPECIFIC INFORMATION
RELATED TO DETENTION SIZING AND SITE ROUTING
2. TEST THE TOPSOIL TO DETERMINE THE VIABILITY OF THESE SOILS AND THE AMENDMENTS (IF ANY) THAT WILL BE NEEDED.
3. UNWANTED VEGETATION IN THE STORMWATER WETLAND FACILITY AREA SHALL BE REMOVED DURING SITE PREPARATION. TREES DETERMINED TO BE
RETAINED MUST BE PROTECTED WITH ORANGE FENCING.
4. NO MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE ALLOWED WITHIN THE STORMWATER WETLAND FACILITY SITES AFTER SITE CLEARING AND
GRADING HAVE BEEN COMPLETED, EXCEPT TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS STORMWATER WETLAND BMPS.
5. THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY WITH THE EXCEPTION OF THE INTERIOR GRADING. THE INTERIOR GRADING WILL BE
CONSTRUCTED ONCE THE EROSION CONTROL PHASE IS COMPLETE.
6. ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE EROSION CONTROL INSPECTOR APPROVES THE REMOVAL OF THE SEDIMENT BASIN, THE
CONTRACTOR SHALL REMOVE THE TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. ALL SEDIMENT, TRASH, ETC., SHALL BE PROPERLY
DISPOSED OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY AFFECTED.
7. AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION CONTROL DEVICES REMOVED, THE CONTRACTOR SHALL CONSTRUCT THE INTERIOR GRADING
SHOWN ON THIS SHEET.
8. AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF ALL STORMWATER WETLAND FACILITIES INCLUDING CUT SLOPES AND FILL AREAS. THE
MAXIMUM PERMEABILITY RATE FOR THE LINER SHALL BE 0.72 CM /DAY. THE PROPOSED MATERIAL FOR THIS LINER SHALL BE TESTED BY A QUALIFIED
GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE RESULTS OF THIS TESTING SHALL BE SUBMITTED TO THE DESIGN ENGINEER FOR REVIEW PRIOR
TO PLACEMENT. THE RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE TOWN OF APEX, NC FOR APPROVAL.
9. THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN REPRESENT THE FINISH GRADE OF THE WETLAND SYSTEM.
10.ALL DISTURBED SUBSOILS SHALL BE TILLED BEFORE CAPPING WITH A MINIMUM OF 12 INCHES OF TOPSOIL. AREAS OF THE STORMWATER WETLAND
HAVING A PERMANENT POOL DEPTH OF 6 INCHES OR GREATER (E.G., THE FOREBAY AND DEEP POOL AREAS), WILL BE CAPPED WITH A MINIMUM OF 6
INCHES OF TOPSOIL. NO TILLING SHALL OCCUR WITHIN THE DRIP LINE OF EXISTING TREES. AFTER TILLING IS COMPLETED, NO OTHER CONSTRUCTION
TRAFFIC SHALL BE ALLOWED IN THE AREA, EXCEPT FOR PLANTING AND RELATED WORK.
11.STRUCTURAL BMP "AS BUILTS" WILL BE REQUIRED AND SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT APPROVAL (WITH RESPECT TO A
SUBDIVISION) OR CERTIFICATE OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP IS
CONSTRUCTED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION PLANS. AS -BUILT SURVEY REQUIREMENTS FOR THE STRUCTURAL BMP'S SHALL
INCLUDE BUT NOT BE LIMITED TO THE FOLLOWING: CONTRACTOR SHALL PROVIDE AS -BUILT TOPOGRAPHIC SURVEY PERFORMED BY A PROFESSIONAL
LAND SURVEYOR CERTIFYING STRUCTURAL BMP AREA DIMENSIONS, ELEVATIONS, INLET /OUTLET STRUCTURE INVERTS, ORIFICE DIAMETER, PIPE SIZES,
AND CLEANOUT LOCATIONS. * *IN THE CASE OF THE PROPOSED STORMWATER WETLANDS IT WILL BE NECESSARY TO PROVIDE BOTTOM ELEVATIONS FOR
THE FOREBAYS, DEEP POOLS, SHALLOW LAND, AND SHALLOW WATER ZONES **
INTERIOR WALL PROFILE NOT SHOWN
#4 BARS - WELDED IN
SYMMETRICAL PATTERN
(WITH LOCKABLE HATCH
FOR ACCESS)
N
i
5' -8"
RISER STRUCTURE
5, -4»
I I I
I I I I
I I
1 I
I I
I
6 "0 ORIFICE
2.5 99 0 ORIFICE
3"0 ORIFICE
6"0 ORIFICE
TRASH GUARD
NOT TO SCALE
3" ORIFICE
INVERT = 397.
TOP OF RISER = 399.5 -
4-6" ORIFICE -
INVERT = 398.2
OUTLET BOX I
■r:zl
■ri■Ni
■WEN"
0
Z
O_
C)
LiJ
w
U-
C__
Q.
D
z
0
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0. U. LJ
0 w
W
Co
Ld
cy-
G..
� o
N
6 "0 ORIFICE p"� ,o
Cld ^
U
u V
O � �
PLAN %*#VV0 PSI REINF. Z .,.*
CONCRETE RISER � o
NOT TO SCALE STRUCTURE O . N 'It
Cd a� N �so
o• .-.� c�
U a N r- M •v
O o V 00
w z
� •X o1I
au
TRASH RACK SEE V o o
DETAIL Z cd 4
fwd -�aw�
W Z
Q ¢
� V
O�
Qo
U)
z
2.5" ORIFICE
X
Q
NVERT = 396.0
'SEE
� O
-
z a
�
SUBMERGED
ORIFICE
w
� Q
W
OUTLET
)ETAIL)
Q
�
0
�
D �� �
� �
�
�
FEB 14 2008
Z
o
O
SECTION
W
Q`J
O
_
0
H
NOT TO SCALE
I--
OEN�c•W?���� ,�., c �ANGN
( 1
DS D.
V' PVC SCREW A
TYPE PLUG 36" 3
4" P VIC TEE
�1 ■ ■ ■ ■ ■ ■ ■ ■ ■■ ■ ■ ■1r s
wlERMANENT -•• i ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■1 t ■
• . . 1 ■ ■ ■ ■■ ■ ■ ■ ■ ■ ■ ■ ■1 ■ •
1 ■ ■ ■ ■ ■ ■ ■ ■■ ■ ■ ■ ■i ■
rl ■ ■It ■ ■ ■ ■■ ■ ■ ■ ■ ■ EMBEDDED
SECTION
' VC CAP WITH
DRILL HOLE
3ED
litGAYtill; JI;ALL''
40' 0 40' 80'
( IN FEET )
1 inch = 40 ft.
STORMWATER WETLAND #1 - EXTERIOR WALL PROFILE
SCALE: 1" = 40'H; 1" = 4'V
LWELDED 1/2" STAINLESS STEEL
BARS WITH 2° SQUARE OPENINGS
� O
w
TRASH RACK DETAIL
J U)
w
�
�
Q
0
z
Z)
�
m
o
�
�
U)
W
Q`J
O
I--
/'Y T • TTTT lV rV /Y ♦ T T
U)
litGAYtill; JI;ALL''
40' 0 40' 80'
( IN FEET )
1 inch = 40 ft.
STORMWATER WETLAND #1 - EXTERIOR WALL PROFILE
SCALE: 1" = 40'H; 1" = 4'V

3630 * (1" ) * (0.59 IN/IN) * `(7.58AC) FOOTING: 1' X 5.33' X 5.33' = 28.41 CF
, 1 1
WATER VOLUME X WATER DENSITY
16,234 CF
#4 BARS WELDED IN
= (85.23 CF + 28.41 CF) X 62.4 LBS./CF
SYMMETRICAL PATTERN
SHALLOW LAND PROVIDED VOLUME FROM 1" OF RUNOFF 16,949 CF = 7,091.14 LBS. WITH LOCKABLE HATCH
J." C
FOR ACCESS)
6,9 STRUCTURE WILL NOT FLOAT
VOLUME PROVIDED > VOLUME REQUIRED l ' RIS#82
12 0 16,949 > 16,234 CF C-I
+ . 08
Ilk, ES#83
oo.e
N. --T 1 404
404
AREA FOR D
REQUIRED SURFACE WETLAND
A C4
--- --- ----- ----
V TOTAL DRAINAGE AREA TO RAISIN: 7.58 AC. 1 i 5 0-899
C
P POOL
�` �-- , 1 PERCENT OF IMPERVIOUS FOR DRAINAGE AREA: 60.3% 402 402 1 1 1 11-1
RISER STRUCTURE
AVERAGE PERMANENT POOL DEPTH: 1 FT.
'" ` ��` \ -'' ` t 1 �O 100-M, LF
_FORM 1124*37
--------------------- ------- -- - -------------
51 u
\�IIX
1 2\
:r IT
REQUIRED SURFACE AREA: SA = 169234 CF/1.0 FT 1 i 5' -4" 1
1 1 f REQUIRED SURFACE AREA: SA = 16,234 SF t 1 400 - - - - - - - - - 400
PROVIDED SURFACE AREA: SA = 16,949 SF
oo.61
%
00
1 s 6 SHALLOW LAND ------
$HALLOW WAT
8�HALLOW LAN [D ------ -------------- dop-
Nb
C 183 0 W TER
SHALL
x(18
-3�n-3tA
d �S�
V ♦ o A- . ........
FE #46
-33
0(; i<00" 9
-3
FORE Y A
V
ALLOW LAND
4Q1. 0 1
FOREBAY
A
35.5 9 J __ 9
PRIV TE BMP
\V
\ ♦ \
V,
\\M Al N Tf_N AN CE \ ♦ i I ---
�o
L
\'\EASEMENT
10I
x
I/ L
L 6 0 6 �
FES#33
,: :\ / V
Q)
1 02.0 °� \ t; { \ / . 1 `�� 404.0
\ \ 395.
1 395.5
'{ S TR,...o C R E
% WAINA I I TI
lilt t STEPS T NDARD CDOT
1 ._ I : a 8f0.6 6
4.N0 MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE ALLOWED WITHIN THE STORMWATER
WETLAND FACILITY SITES AFTER SITE CLEARING AND GRADING HAVE BEEN COMPLETED, EXCEPT
TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS STORMWATER WETLAND BMPS.
5. THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY WITH THE EXCEPTION OF THE
INTERIOR GRADING. THE INTERIOR GRADING WILL BE CONSTRUCTED ONCE THE EROSION
CONTROL PHASE IS COMPLETE.
6. ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE EROSION CONTROL INSPECTOR
APPROVES THE REMOVAL OF THE SEDIMENT BASIN, THE CONTRACTOR SHALL REMOVE THE
TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. ALL SEDIMENT, TRASH, ETC.,
k SHALL BE PROPERLY DISPOSED OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED
IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY AFFECTED.
7. AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION CONTROL DEVICES REMOVED, THE
CONTRACTOR SHALL CONSTRUCT THE INTERIOR GRADING SHOWN ON THIS SHEET.
8. AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF ALL STORMWATER WETLAND
FACILITIES INCLUDING CUT SLOPES AND FILL AREAS. THE MAXIMUM PERMEABILITY RATE FOR
THE LINER SHALL BE 0.72 CM/DAY. THE PROPOSED MATERIAL FOR THIS LINER SHALL BE
� TESTED BY A QUALIFIED GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE RESULTS OF
k O THIS TESTING SHALL BE SUBMITTED TO THE DESIGN ENGINEER FOR REVIEW PRIOR TO
PLACEMENT. THE RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE TOWN OF
k APEX, NC FOR APPROVAL.
9. THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN REPRESENT THE FINISH GRADE OF
THE WETLAND SYSTEM.
10. ALL DISTURBED SUBSOILS SHALL '8E TILLED BEFORE CAPPING NTH A MINIMUM OF 12 INCHES
OF TOPSOIL. AREAS OF THE STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH OF 6
MoNLZo UK GREATER LK (E.G.. THE FOREBAY T ANU ULLr rVVL mmr-A;D), WILL BE %.,/Ar-r-r_U WITH n /A
MINIMUM OF 6 INCHES OF TOPSOIL. NO TILLING SHALL OCCUR WITHIN THE DRIP LINE OF
EXISTING . AFTER TILLING , NO OTHER
STORMWATER WETLAND #3 PLAN ALLOWED NET HE AREA, EXCEPT IS FOR COMPLETED PLANTING AND RELATED WORKCONSTRUCTION TRAFFIC SHALL BE
SCALE: 1 20'H 11. STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND SUBMITTED PRIOR TO FINAL
INSPECTION AND RECEIVING PLAT APPROVAL (WITH RESPECT TO A SUBDIVISION) OR
CERTIFICATE OF OCCUPANCY (NTH RESPECT TO A SITE PLAN). THE AS-BUILT SUBMITTAL
SHALL CERTIFY THE STRUCTURAL BMP IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
CONSTRUCTION PLANS. AS-BUILT SURVEY REQUIREMENTS FOR THE STRUCTURAL BMP 'S SHALL
INCLUDE BUT NOT BE LIMITED TO THE FOLLOWING: CONTRACTOR SHALL PROVIDE AS-BUILT
TfIr_%PADW1r% CHOkig'Y orprnpurn Py A PP09717<Z<%,10NA1 I ANr) qHPVPYr)P r17PT117Y1Nr.
404
/3955
---------------
.................. - ------- - -
SURFACE AREA rNUVILkAj = SURFACE AREA REQUIRED
402
402
to
Cis
W-TrI
EL 399.25 STORM /
6A.-
---------
v
"I
.
-­-----------------------
It
REQUIRED ORIFICE DIAMETER FOR 2-5 DAY DRAW DOWN
398
TOP OF WALL 398.0 1
1-111. STORM--I
------------
-----------
4w*CR_
. ....... . . .
2
398
�7
10-YR. STORM
--- - ------ - -- -------- WALL AREA
617 SF ----- -- -------
EL. 400.13
EL 399.25
0
1 0.111
--------------
81111. 398.20
1-YR. STOR
.61%
_..
398
39
EL 398.20
r
E 99.25
398
/--3" SHALLOI 1 00.61%,
WATER 395 75
TEMPORARY POOL VOLUME = 16,949 CF
FT
396
------ -------
15 "RCP
Z-I SHALLOW
WATER 395.75
396
41
0
0
392
394
TRASH GUARD
N Co
+
------------------- -
HEIGHT OF TEMPORARY POOL = 1.0
-Y SHALLOW ------ -----------
396
1390
(::)
0
gg
WATER 395.7
4_4
396
BOTTOM OF m
--DEEp--pjo-oU---- ......
0
392
- -
ELEV=392.50-,-'
-------- ------------------
DRAWDOWN TIME = 2 DAYS OR 172,800 SEC
FLOWRATE = 16,949 CF /172,800 SEC = 0.098 CFS
0
En
390
< >
+
n 0
30'R%.or-
390
044"
u
NOT TO SCALE
u 3
0
-- ---------------
------- ---- ----------------------- - ,_.w ------ ------------ ------------ - - ---------- ------ -- -
ORIFICE COEFFICIENT = 0.6
384
FOREBA
DEEP POOL
wz
388
I
388
-- ------------------------ ------ b o
394
-----------
<
382
394
\L SH A LLO WATER
LEV
C*4
4 ui to (6 46
0) 0) 0 0 0)
i
394
(PFERNAA I, Pool-)
1
----------
AREA = (Q/C)/SQRT(2*G*H)
---------------- % f
MAX. ELEV=396.00
392
.............. ------
- ------
---- -------- --------------- ---------- ----------------------------------
-
I
Z
392
E-I.B2LF
= (0.098/0.6)/SQRTI(2)*(32.2)*(0.33)1
W
BOTTOM OF
E:: D
CL
<
W
1
1
I
- --
00
= 0.0354 SF
= 5.09 SQ IN
392
BOTTOM OF
O
IIII
an
392
6 "0 ORIFICE
1
LI
- - - - - - ----------- -
--------
390
------------------- DWEEP POI06--­-
Im
IJ
D-----------------
--------
4.00
DIAMETER = SQRT(AREA* 4)/P
ELEV=392.50
rI
CID
017
388
(0000
- --- -- --------------- R12, _R A2_­
---------------- ----- -
cr)
0 0-)
----------------------------- - - -- ------------------- -
388
= SQRTj(5.09)*(4)/3.14j
DISSIPAT
390
v- rn
(13C8
f_jc)
00' C14
KNII
III n
PAD
390
00 0 • * * 0
- - -er -
8
4 _099
8
/395.5
= 1.44 INCHES
�+M
+ plei
I . .
7 9 CZ
II
11+00
USE 1.5 INCHES
Zn
= 0 D
> >
--
2>>>
\4%
j
388
i& ri
tt oom.
E
_AK K
azz z
388
STORMWATER WETLANDS SITE PREPARATION & GRADING
1. STOCKPILE AND PROTECT EXISTING TOPSOIL ON SITE (SEE STOCKPILED TOPSOIL LOCATIONS).
10+00
6 0 ORIFICE
2. TEST THE TOPSOIL TO DETERMINE THE VIABILITY OF THESE SOILS AND THE AMENDMENTS (IF
S TO R
-
)A)
ANY) THAT WILL BE NEEDED.
SCALE: 1 40'H; 1
4'V
--
3. UNWANTED VEGETATION IN THE STORMWATER WETLAND FACILITY AREA SHALL BE REMOVED
DURING SITE PREPARATION. TREES DETERMINED TO BE RETAINED MUST BE PROTECTED WITH
I%r% A ► ^r- r-r-L ^ L
4.N0 MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE ALLOWED WITHIN THE STORMWATER
WETLAND FACILITY SITES AFTER SITE CLEARING AND GRADING HAVE BEEN COMPLETED, EXCEPT
TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS STORMWATER WETLAND BMPS.
5. THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY WITH THE EXCEPTION OF THE
INTERIOR GRADING. THE INTERIOR GRADING WILL BE CONSTRUCTED ONCE THE EROSION
CONTROL PHASE IS COMPLETE.
6. ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE EROSION CONTROL INSPECTOR
APPROVES THE REMOVAL OF THE SEDIMENT BASIN, THE CONTRACTOR SHALL REMOVE THE
TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. ALL SEDIMENT, TRASH, ETC.,
k SHALL BE PROPERLY DISPOSED OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED
IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY AFFECTED.
7. AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION CONTROL DEVICES REMOVED, THE
CONTRACTOR SHALL CONSTRUCT THE INTERIOR GRADING SHOWN ON THIS SHEET.
8. AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF ALL STORMWATER WETLAND
FACILITIES INCLUDING CUT SLOPES AND FILL AREAS. THE MAXIMUM PERMEABILITY RATE FOR
THE LINER SHALL BE 0.72 CM/DAY. THE PROPOSED MATERIAL FOR THIS LINER SHALL BE
� TESTED BY A QUALIFIED GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE RESULTS OF
k O THIS TESTING SHALL BE SUBMITTED TO THE DESIGN ENGINEER FOR REVIEW PRIOR TO
PLACEMENT. THE RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE TOWN OF
k APEX, NC FOR APPROVAL.
9. THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN REPRESENT THE FINISH GRADE OF
THE WETLAND SYSTEM.
10. ALL DISTURBED SUBSOILS SHALL '8E TILLED BEFORE CAPPING NTH A MINIMUM OF 12 INCHES
OF TOPSOIL. AREAS OF THE STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH OF 6
MoNLZo UK GREATER LK (E.G.. THE FOREBAY T ANU ULLr rVVL mmr-A;D), WILL BE %.,/Ar-r-r_U WITH n /A
MINIMUM OF 6 INCHES OF TOPSOIL. NO TILLING SHALL OCCUR WITHIN THE DRIP LINE OF
EXISTING . AFTER TILLING , NO OTHER
STORMWATER WETLAND #3 PLAN ALLOWED NET HE AREA, EXCEPT IS FOR COMPLETED PLANTING AND RELATED WORKCONSTRUCTION TRAFFIC SHALL BE
SCALE: 1 20'H 11. STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND SUBMITTED PRIOR TO FINAL
INSPECTION AND RECEIVING PLAT APPROVAL (WITH RESPECT TO A SUBDIVISION) OR
CERTIFICATE OF OCCUPANCY (NTH RESPECT TO A SITE PLAN). THE AS-BUILT SUBMITTAL
SHALL CERTIFY THE STRUCTURAL BMP IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
CONSTRUCTION PLANS. AS-BUILT SURVEY REQUIREMENTS FOR THE STRUCTURAL BMP 'S SHALL
INCLUDE BUT NOT BE LIMITED TO THE FOLLOWING: CONTRACTOR SHALL PROVIDE AS-BUILT
TfIr_%PADW1r% CHOkig'Y orprnpurn Py A PP09717<Z<%,10NA1 I ANr) qHPVPYr)P r17PT117Y1Nr.
404
---------------
.................. - ------- - -
404
402
402
to
Cis
402
100-YR. STORM
ELEV: 401.00
402
.
-­-----------------------
It
400
400
TOP OF WALL 398.0 1
400
------------
-----------
1uu_yN. �51C'Hm --------------------- .400
. ....... . . .
2
�7
10-YR. STORM
--- - ------ - -- -------- WALL AREA
617 SF ----- -- -------
EL. 400.13
EL 399.25
0
1 0.111
--------------
398
1-YR. STOR
23.83LF
_..
398
39
EL 398.20
r
E 99.25
398
/--3" SHALLOI 1 00.61%,
WATER 395 75
n1I
396
------ -------
15 "RCP
. .... .... ................ ...... ...
396
41
0
0
392
394
394
N Co
+
------------------- -
-Y SHALLOW ------ -----------
1390
(::)
0
gg
WATER 395.7
4_4
392
BOTTOM OF m
--DEEp--pjo-oU---- ......
0
392
- -
ELEV=392.50-,-'
-------- ------------------
396
0
En
390
< >
+
n 0
-----------
0+ C-0 4
390
044"
u
:i>>
u 3
0
-- ---------------
------- ---- ----------------------- - ,_.w ------ ------------ ------------ - - ---------- ------ -- -
- - - ---- - ---- - ---
384
DEEP POOL
wz
388
388
1.5"0 ORIFICE
2.5"0 ORIFICE
6"0 ORIFICE
2.5" ORIFICE
INVERT = 397.0
TOP OF RUSER =-_3219,4
4-6" ORIFICE
• INVERT = 398.2
--------------- -
404- 404 STRUCTURAL BMP AREA DIMENSIONS, ELEVATIONS, INLET OUTLET STRUCTURE INVERTS, ORIFICE 10+00
DIAMETER, PIPE SIZES, AND CLEANOUT LOCATIONS. **IN THE CASE OF THE PROPOSED
)
THE #
STORMWATER WETLANDS IT WILL BE NECESSARY TO PROVIDE BOTTOM ELEVATIONS FOR E STORMWATER WETLAND 3 FOREBAY B
-------- ------ - FOREBAYS, DEEP POOLS, SHALLOW LAND, AND SHALLOW WATER ZONES** SCALE: 1 40'H; 1 4'V
-----------------
402
---------------
-
404
404
402
to
Cis
402
ELEV: 401.00
402
400
-­-----------------------
It
2�
400
TOP OF WALL 398.0 1
------------
-----------
1uu_yN. �51C'Hm --------------------- .400
. ....... . . .
2
--- - ------ - -- -------- WALL AREA
617 SF ----- -- -------
EL. 400.13
0
00
--------------
10 Y R,,,- ` S�TO R 4 ------------- ------ -------- --- --
-- -- - - -- -
39
u
E 99.25
398
394
n1I
.4
-------------- I - ------ - -------------
mop.-
1 -YR. STORM
398
41
0
0
392
EL. 398.20
N Co
+
------------------- -
-Y SHALLOW ------ -----------
1390
(::)
0
WATER 395.7
4_4
396
------
00 ----------------- -----
- -
Cd Ln
-------- ------------------
396
0
En
388
< >
CIO
C6
$-4 ,
0 0 W4
(u
044"
u
W �-
M z-
u 3
0
-- ---------------
------- ---- ----------------------- - ,_.w ------ ------------ ------------ - - ---------- ------ -- -
- - - ---- - ---- - ---
384
DEEP POOL
wz
394
-- ------------------------ ------ b o
394
-----------
<
382
ZEV
\L SH A LLO WATER
LEV
C*4
4 ui to (6 46
0) 0) 0 0 0)
oil
10+00 11+00 12+00 13+00 14+00
(PFERNAA I, Pool-)
----------
---------------- % f
MAX. ELEV=396.00
392
.............. ------
- ------
---- -------- --------------- ---------- ----------------------------------
-
Z
392
E-I.B2LF
W
BOTTOM OF
E:: D
CL
<
W
.................
............ -------- ----------
- --
00
----------
---------------- -----
ELEV= 392.50
O
@1.00%
390
------
-------------------- - ------ --------------- -
LI
- - - - - - ----------- -
--------
390
L .. ....................
IJ
D-----------------
--------
• uu
00 Co
388
--------------------
- --- -- --------------- R12, _R A2_­
---------------- ----- -
cr)
0 0-)
----------------------------- - - -- ------------------- -
388
DISSIPAT
R
v- rn
PAD
00 0 • * * 0
- - -er -
of(ncZ
}
7 9 CZ
10+00
11+00
STORMWATER WETLAND #3 PROFILE
SCALE: 1" = 20'H; 1" = 2'V I
STORMWATER WETLAND #3 EXTERIOR WALL PROFILE
SCALE: 1" = 40'H; 1" = 4'V
FLAN
NOT TO SCALE
1.5" ORIFICE '
INVERT = 396.0
(SEE SUBMERGED
ORIFICE OUTLET
DETAIL)
I-
6"0 ORIFICE
n DC1 DCIKICI
CONCRETE RISER
STRUCTURE
TRASH RACK SEE
DETAIL
Z
0
V)
LLJ
0f
LJ
w I
L a
I-N
0
U_
N-,,
z
0
D
z
0
0
z w
0 0
F___ LL.
CL
LJ
V)
LAj
0 V)
<
C.)
0
CL
(u
404
404
to
Cis
402
0
Cis
402
400
It
400
TOP OF WALL 398.0 1
398
398
. ....... . . .
2
--- - ------ - -- -------- WALL AREA
617 SF ----- -- -------
-- - ------
0
... . ..............
396
-- -- - - -- -
39
u
-A.
394
.4
3
94
41
392
392
390
1390
(::)
------ - -----
4_4
cis Q�
0
It
Cid
Cd Ln
00 •
0
En
388
388
CIO
C6
$-4 ,
0 0 W4
(u
044"
u
0 to
wo
c)
u 3
0
386
386
- - - ---- - ---- - ---
384
It
wz
84
382
-----------
<
382
ZEV
LEV
C*4
4 ui to (6 46
0) 0) 0 0 0)
oil
10+00 11+00 12+00 13+00 14+00
STORMWATER WETLAND #3 EXTERIOR WALL PROFILE
SCALE: 1" = 40'H; 1" = 4'V
FLAN
NOT TO SCALE
1.5" ORIFICE '
INVERT = 396.0
(SEE SUBMERGED
ORIFICE OUTLET
DETAIL)
I-
6"0 ORIFICE
n DC1 DCIKICI
CONCRETE RISER
STRUCTURE
TRASH RACK SEE
DETAIL
Z
0
V)
LLJ
0f
LJ
w I
L a
I-N
0
U_
N-,,
z
0
D
z
0
0
z w
0 0
F___ LL.
CL
LJ
V)
LAj
0 V)
<
C.)
0
CL
00
z
OUTLET BOX
SECTION Z o O
NOT TO SCALE FEB 14 Z008 0 F-
49* PVC SCREW 1ASER-QUALITY
TYPE PLUG DF-t4R - % LIJ
4'9 PVC TEE w"OS AND gTi5k"ATER swo 1 U)
�/ `J
PERMANENT POOL 36 -311 Q � J
ELEV.=396.0 Ill If 11 111 1 1 1 ir
A C� M
0
Cq
4" PVC CAP WITH 1/2 0 BOLT W O z
1.5" DRILL HOLE %am, r-rI EMBEDDED 2" (TYP.) � U Q
A SECTION A-A -J
4" PVC STUBBED J z �-
INTO BOX L-WELDED 1/2" STAINLESS STEEL � O w
• BARS WITH 2 SQUARE OPENINGS >
SUBMERGED ORIFICE OUTLET TRASH RACK D
Klr)T Tr) 4ZrAl P` > w SEE DETAILED INTELLISOLVE HYDRAFLOW F-- o<
POND SIZING REPORT FOR SPECIFIC z )
INFORMATION RELATED TO DETENTION 0
SIZING AND SITE ROUTING
UJ
INTERIOR WALL PROFILE NOT SHOWN: U) Q o
GRAPHIC SCALE � �
STORMWATER WETLANDS #3 WETLAND AREA DISTRIBUTION. 40' 0 40" 809
TOTAL SURFACE AREA: 16949 SF
REQ. REQ. SF PROV. SF PROVIDED IN FEET
1 inch = 40 ft.
FOREBAY 10% 1694.9 2115 12.48%
SHALLOW WATER 40% 6779.6 7115 41.98%
SHALLOW LAND 30% 5084.7 6750 39.83%
FOR CONSTRUCTION..
DEEP POOL 5-10% 969 5.72%
• .. ... ....... .
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
HORZ SCALE:
CM-ENGINEERING DATE PUBLIC WORKS- ENV. PROGRAMS DATE VERT SCALE:
CM- TRANSPORTATION DATE PLANNING DA DRAWN BY: ACL
CHECKED BY: FDR
CM-BUILDING INSPECTIONS DATE PLANNING- TRANSPORTATION DATE
DATE: 1-31-08
PUBLIC WORKS -WATER /SEWER DATE FIRE DATE PROJEC-' NO. 12070308A C1
PUBLIC WORKS-ELECTRIC DATE PARKS, RECREATION & ­_'UTATE .
CULTURAL RES. sHEer .NO.
PUBLIC WORKS-
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TYPE PLUG DF-t4R - % LIJ
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PERMANENT POOL 36 -311 Q � J
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1.5" DRILL HOLE %am, r-rI EMBEDDED 2" (TYP.) � U Q
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• BARS WITH 2 SQUARE OPENINGS >
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POND SIZING REPORT FOR SPECIFIC z )
INFORMATION RELATED TO DETENTION 0
SIZING AND SITE ROUTING
UJ
INTERIOR WALL PROFILE NOT SHOWN: U) Q o
GRAPHIC SCALE � �
STORMWATER WETLANDS #3 WETLAND AREA DISTRIBUTION. 40' 0 40" 809
TOTAL SURFACE AREA: 16949 SF
REQ. REQ. SF PROV. SF PROVIDED IN FEET
1 inch = 40 ft.
FOREBAY 10% 1694.9 2115 12.48%
SHALLOW WATER 40% 6779.6 7115 41.98%
SHALLOW LAND 30% 5084.7 6750 39.83%
FOR CONSTRUCTION..
DEEP POOL 5-10% 969 5.72%
• .. ... ....... .
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
HORZ SCALE:
CM-ENGINEERING DATE PUBLIC WORKS- ENV. PROGRAMS DATE VERT SCALE:
CM- TRANSPORTATION DATE PLANNING DA DRAWN BY: ACL
CHECKED BY: FDR
CM-BUILDING INSPECTIONS DATE PLANNING- TRANSPORTATION DATE
DATE: 1-31-08
PUBLIC WORKS -WATER /SEWER DATE FIRE DATE PROJEC-' NO. 12070308A C1
PUBLIC WORKS-ELECTRIC DATE PARKS, RECREATION & ­_'UTATE .
CULTURAL RES. sHEer .NO.
PUBLIC WORKS-
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414
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STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH
414
40' 0 40' 80'
V
412
..........
EL. 409.70
---------------
412
410
--0 ~
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REQ. SF
410
412
10 -YR. STORM =
30.341.
0 0
10%
721.9
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(IN FEET
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------------
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-
408
EL. 408.18
EL. 409.70
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z
2809
416
­ - ----------------
.STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND
SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT
410
5 -10%
406
~-~~»
5.08%
FOR C
~
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410
0 -YR. STORM
=
L
OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE
414
L. 409.06
to
404
AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP
0
~ ~in
408
404
a
IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
0 to
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408
THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
1 -YR. STORM
00.50%
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402
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STORMWATER WETLAND OUTLET STRUCTURE
#4 BARS - WELDED IN
SYMMETRICAL PATTERN
(WITH LOCKABLE HATCH
FOR ACCESS)
co
N
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5' - 8,. I
I
RISER STRUCTURE
I I
5' -4.,
I
I I
STDRMWATER WETLAND # 4 FOREBAY 'B'I
SCALE: 1 " = 40'H; 1 it = 41V
414
TOTAL SURFACE AREA:
7219
s
I
414
i
STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH
412
40' 0 40' 80'
_
412
EL. 409.70
---------------
410
0
~
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410
PROVIDED
10 -YR. STORM =
30.341.
FOREBAY
10%
721.9
L- ,_A0U6.�. _ . Sl
°»
(IN FEET
OF EXISTING TREES. AFTER TILLING IS COMPLETED, NO OTHER
408
-
1 -YR. STORM
2887.6
�2,26ll
-
408
EL. 408.18
SHALLOW LAND
30%
2165.7
2809
416
.STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND
SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT
DEEP POOL
5 -10%
406
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5.08%
FOR C
~
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DEEP POOL
OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE
414
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404
AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP
0
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a
IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
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STORMWATER WETLAND #4 - PROFILE
SCALE: 1 = 20'H; 1" = 21V
6"0 ORIFICE
1 "O ORIFICE
3"0 ORIFICE
STORMWATER WETLAN #4 - FOREBAY 'A' 6 "0 ORIFICE
SCALE: 1 " = 40'H; 1 " = 4'V
BOUYANCY CALCULATIONS STORMWATER WETLANDS #4 - SIZING. CALCULATIONS. AND REQUIREMENTS
WEIGHT OF CONCRETE (DOWNWARD FORCE) REQUIRED VOLUME TO CONTROL THE 1" STORM
RISER: (2(4'x0.67') + 2(5.33x0.67')) x 3.7' = 46.26 CF
FOOTING: 1' X 5.33' X 5.33' = 28.41 CF RUNOFF COEFFICIENT (RV): STORM RUNOFF (IN) / STORM RAINFALL (IN)
GROUT: 1' X 4' X 4' = 16 CF PERCENT IMPERVIOUS (1): DRAINAGE AREA (AC) / IMPERVIOUS PORTION OF DA (AC.)
CONCRETE VOLUME X CONCRETE DENSITY = _
= (46.26 CF + 28.41 CF + 16 CF) X 150 LBS. /CF RV = 0.05 + 0.9 * (1)
= 139600 LBS. = 0.05 + 0.9 * (1.87/3.67)
=
WEIGHT OF WATER DISPLACED (UPWARD FOR 0.51 IN /IN
RISER: 5.33' X 5.33' X 3.7' = 105.11 CF REQ. VOL. FROM 1" OF RUNOFF= (DESIGN RAINFALL) * (RV) * ((DRAINAGE AREA ) INVERT = 407.5
3 ORIFICE
FOOTING: 1' X 5.33' X 5.33' = 28.41 CF = 3630 * (1" ) * (0.51 IN /IN) * (3.67AC)
WATER VOLUME X WATER DENSITY = 69794.3 CF
= (105.11 CF + 28.41 CF) X 62.4 LBS. /CF
= 8,331.65 LBS. PROVIDED VOLUME FROM 1" OF RUNOFF = 7,219 CF TOP OF RISER = 409.9
STRUCTURE WILL NOT FLOAT VOLUME PROVIDED > VOLUME REQUIRED
79219 > 6,794.3 CF --
4 --
)RMWATER WETLANDS SITE PREPARATION &GRADING -6" ORIFICE
INVERT = 408.2
,STOCKPILE AND PROTECT EXISTING TOPSOIL ON SITE (SEE REQUIRED SURFACE AREA FOR WETLAND
STOCKPILED TOPSOIL LOCATIONS).
TRASH GUARD
NOT TO SCALE
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JEST THE TOPSOIL TO DETERMINE THE VIABILITY OF THESE TOTAL DRAINAGE AREA TO BAISIN: 3.67 AC. � � � J U- Q
�
SOILS AND THE AMENDMENTS (IF ANY) THAT WILL BE NEEDED. PERCENT OF IMPERVIOUS FOR DRAINAGE AREA: 51% Q AVERAGE PERMANENT POOL DEPTH: 1 FT. Q. 06 . UNWANTED VEGETATION IN THE STORMWATER WETLAND 1" ORIFICE z
FACILITY AREA SHALL BE REMOVED DURING SITE
REQUIRED SURFACE AREA SA = 69794 CF /1.0 FT - INVERT = 406.5 Z
REQUIRED SURFACE AREA: SA = 6 794 F
S (SEE SUBMERGED PREPARATION. TREES DETERMINED TO BE RETAINED MUST BE Q O
PROTECTED WITH ORANGE FENCING. PROVDED SURFACE AREA: SA = 7,219 SF ORIFICE OUTLET) - �� F- Im L S. .NO MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE
SURFACE AREA PROVIDED > SURFACE AREA REQUIRED q U
ALLOWED WITHIN THE STORMWATER WETLAND FACILITY SITES
CLEARING A W
AFTER SITE CLE G ND GRADING HAVE BEEN COMPLETED,
EXCEPT TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS 4 2008 �„� C)
REQUIRED ORIFICE DIAMETER FOR 2 -5 DAY DRAW DOWN SECTION FEB
STORMWATER WETLAND BMPS. OUTLET BOX
NOT T
0 SCALE
THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY Z
TEMPORARY POOL VOLUME = 7,219 CF �MWgj��.���i�
WITH THE EXCEPTION OF THE INTERIOR GRADING. THE = DEN A %iN0 Q
HEIGHT OF TEMPORARY POOL 1.0 FT pS"T0'� LL
INTERIOR GRADING WILL BE CONSTRUCTED ONCE THE EROSION DRAWDOWN T1ME = 2 DAYS OR 172 800 __ 4" PVC SCREW V DS AN _..I
CONTROL PHASE IS COMPLETE. - - SEC TYPE PLUG � LL
.ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE FLOWRATE - 7,219 CF /172,800 SEC = 0.042 CFS __
ORIFICE COEFFICIENT = 0.6 -- "
EROSION CONTROL INSPECTOR APPROVES THE REMOVAL OF __ 4 PVC TEE A
THE SEDIMENT BASIN, THE CONTRACTOR SHALL REMOVE THE 'I • • Z
_ * * 3
TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. AREA (Q /C) /SQRT(2 G H) �-� --� -'1
ALL SEDIMENT, TRASH, ETC., SHALL BE PROPERLY DISPOSED = (0.042 /0.6) /SQRTI(2) (32.2) (.33)j - PERMANENT POOL z
OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED 0.015 SF =ELEV. =406.5 Q
IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY - 2.18 SQ IN 14 �, J
AFFECTED. * AR A RT 4)/P
1 oil
AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION DIAMETER = S Q C E W
CONTROL DEVICES REMOVED, THE CONTRACTOR SHALL = SQRT €(2.18) *(4) /3.14j _ 1/2 0 BOLT
CONSTRUCT THE INTERIOR GRADING SHOWN ON THIS SHEET. = 0.94 INCHES EMBEDDED 2 (TYP.)
AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF = USE 1.0 INCHES 4�' PVC CAP WITH A-J SF;TION A -A
1 DRILL HOLE LL'
ALL STORMWATER WETLAND FACILITIES INCLUDING CUT SLOPES
AND FILL AREAS. THE MAXIMUM PERMEABILITY RATE FOR THE 4" PVC STUBBED
LINER SHALL BE 0.72 CM /DAY. THE PROPOSED MATERIAL INTO BOX
FOR THIS LINER SHALL BE TESTED BY A QUALIFIED
GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE SUBMERGED ORIFICE OUTLET
RESULTS OF THIS TESTING SHALL BE SUBMITTED TO THE NOT TO SCALE
DESIGN ENGINEER FOR REVIEW PRIOR TO PLACEMENT. THE
RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE
TOWN OF APEX, NC FOR APPROVAL.
THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN STORMWATER WETLANDS #4 WETLAND AREA DISTRIBUTION
REPRESENT THE FINISH GRADE OF THE WETLAND SYSTEM.
v� W
'--WELDED 1/2" STAINLESS STEEL
BARS WITH 2' SQUARE OPENINGS
TRASH RACK DETAIL m o �
� w �
U) Q O
� rn
i. ALL DISTURBED SUBSOILS SHALL BE TILLED BEFORE CAPPING
WITH A MINIMUM OF 12 INCHES OF TOPSOIL. AREAS OF THE
TOTAL SURFACE AREA:
7219
s
I
�
~
STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH
40' 0 40' 80'
OF 6 INCHES OR GREATER (E.G., THE FOREBAY AND DEEP
0
REQ.
REQ. SF
PROV..SF
PROVIDED
416
FOREBAY
10%
721.9
1032
°»
(IN FEET
OF EXISTING TREES. AFTER TILLING IS COMPLETED, NO OTHER
SHALLOW WATER
40%
2887.6
3010
41.70%
1 inch = 40 Pt.
CONSTRUCTION TRAFFIC SHALL BE ALLOWED IN THE AREA,
EXCEPT FOR PLANTING AND RELATED WORK.
SHALLOW LAND
30%
2165.7
2809
416
.STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND
SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT
DEEP POOL
5 -10%
367
5.08%
FOR C
APPROVAL (WITH RESPECT TO A SUBDIVISION) OR CERTIFICATE
414
OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE
414
AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP
0
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
a
IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
SOLELY PER
THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
W
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TOP OF BERM
+ o
412
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EL. 409.06
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1 -YR. STORM
EL. 408.18
a
Z
43.59LF � I I I
406
» ...... �
406
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DEEP POOL
SHALLOW WATER
'
ELEV =406.00
(PERMANENT POOL)
MAX. ELEV = 406.50
404
2eRCP
404
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POOL
/
ELE X4.00
402
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396
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396
10 +00
11+00
12 +00
13 +00
STORMWATER WETLAND #4 - PROFILE
SCALE: 1 = 20'H; 1" = 21V
6"0 ORIFICE
1 "O ORIFICE
3"0 ORIFICE
STORMWATER WETLAN #4 - FOREBAY 'A' 6 "0 ORIFICE
SCALE: 1 " = 40'H; 1 " = 4'V
BOUYANCY CALCULATIONS STORMWATER WETLANDS #4 - SIZING. CALCULATIONS. AND REQUIREMENTS
WEIGHT OF CONCRETE (DOWNWARD FORCE) REQUIRED VOLUME TO CONTROL THE 1" STORM
RISER: (2(4'x0.67') + 2(5.33x0.67')) x 3.7' = 46.26 CF
FOOTING: 1' X 5.33' X 5.33' = 28.41 CF RUNOFF COEFFICIENT (RV): STORM RUNOFF (IN) / STORM RAINFALL (IN)
GROUT: 1' X 4' X 4' = 16 CF PERCENT IMPERVIOUS (1): DRAINAGE AREA (AC) / IMPERVIOUS PORTION OF DA (AC.)
CONCRETE VOLUME X CONCRETE DENSITY = _
= (46.26 CF + 28.41 CF + 16 CF) X 150 LBS. /CF RV = 0.05 + 0.9 * (1)
= 139600 LBS. = 0.05 + 0.9 * (1.87/3.67)
=
WEIGHT OF WATER DISPLACED (UPWARD FOR 0.51 IN /IN
RISER: 5.33' X 5.33' X 3.7' = 105.11 CF REQ. VOL. FROM 1" OF RUNOFF= (DESIGN RAINFALL) * (RV) * ((DRAINAGE AREA ) INVERT = 407.5
3 ORIFICE
FOOTING: 1' X 5.33' X 5.33' = 28.41 CF = 3630 * (1" ) * (0.51 IN /IN) * (3.67AC)
WATER VOLUME X WATER DENSITY = 69794.3 CF
= (105.11 CF + 28.41 CF) X 62.4 LBS. /CF
= 8,331.65 LBS. PROVIDED VOLUME FROM 1" OF RUNOFF = 7,219 CF TOP OF RISER = 409.9
STRUCTURE WILL NOT FLOAT VOLUME PROVIDED > VOLUME REQUIRED
79219 > 6,794.3 CF --
4 --
)RMWATER WETLANDS SITE PREPARATION &GRADING -6" ORIFICE
INVERT = 408.2
,STOCKPILE AND PROTECT EXISTING TOPSOIL ON SITE (SEE REQUIRED SURFACE AREA FOR WETLAND
STOCKPILED TOPSOIL LOCATIONS).
TRASH GUARD
NOT TO SCALE
C!)
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JEST THE TOPSOIL TO DETERMINE THE VIABILITY OF THESE TOTAL DRAINAGE AREA TO BAISIN: 3.67 AC. � � � J U- Q
�
SOILS AND THE AMENDMENTS (IF ANY) THAT WILL BE NEEDED. PERCENT OF IMPERVIOUS FOR DRAINAGE AREA: 51% Q AVERAGE PERMANENT POOL DEPTH: 1 FT. Q. 06 . UNWANTED VEGETATION IN THE STORMWATER WETLAND 1" ORIFICE z
FACILITY AREA SHALL BE REMOVED DURING SITE
REQUIRED SURFACE AREA SA = 69794 CF /1.0 FT - INVERT = 406.5 Z
REQUIRED SURFACE AREA: SA = 6 794 F
S (SEE SUBMERGED PREPARATION. TREES DETERMINED TO BE RETAINED MUST BE Q O
PROTECTED WITH ORANGE FENCING. PROVDED SURFACE AREA: SA = 7,219 SF ORIFICE OUTLET) - �� F- Im L S. .NO MATERIAL STORAGE OR HEAVY EQUIPMENT SHALL BE
SURFACE AREA PROVIDED > SURFACE AREA REQUIRED q U
ALLOWED WITHIN THE STORMWATER WETLAND FACILITY SITES
CLEARING A W
AFTER SITE CLE G ND GRADING HAVE BEEN COMPLETED,
EXCEPT TO CLEAN OUT SEDIMENT BASINS PRIOR TO USE AS 4 2008 �„� C)
REQUIRED ORIFICE DIAMETER FOR 2 -5 DAY DRAW DOWN SECTION FEB
STORMWATER WETLAND BMPS. OUTLET BOX
NOT T
0 SCALE
THE CONTRACTOR SHALL CONSTRUCT THE ENTIRE FACILITY Z
TEMPORARY POOL VOLUME = 7,219 CF �MWgj��.���i�
WITH THE EXCEPTION OF THE INTERIOR GRADING. THE = DEN A %iN0 Q
HEIGHT OF TEMPORARY POOL 1.0 FT pS"T0'� LL
INTERIOR GRADING WILL BE CONSTRUCTED ONCE THE EROSION DRAWDOWN T1ME = 2 DAYS OR 172 800 __ 4" PVC SCREW V DS AN _..I
CONTROL PHASE IS COMPLETE. - - SEC TYPE PLUG � LL
.ONCE THE UPSTREAM DRAINAGE AREA IS STABILIZED AND THE FLOWRATE - 7,219 CF /172,800 SEC = 0.042 CFS __
ORIFICE COEFFICIENT = 0.6 -- "
EROSION CONTROL INSPECTOR APPROVES THE REMOVAL OF __ 4 PVC TEE A
THE SEDIMENT BASIN, THE CONTRACTOR SHALL REMOVE THE 'I • • Z
_ * * 3
TEMPORARY DRAWDOWN RISER AND CLEAN OUT THE BASIN. AREA (Q /C) /SQRT(2 G H) �-� --� -'1
ALL SEDIMENT, TRASH, ETC., SHALL BE PROPERLY DISPOSED = (0.042 /0.6) /SQRTI(2) (32.2) (.33)j - PERMANENT POOL z
OF (I.E., TAKEN AWAY TO A LANDFILL), AND NOT STOCKPILED 0.015 SF =ELEV. =406.5 Q
IN AN AREA WHERE WATER QUALITY COULD BE ADVERSELY - 2.18 SQ IN 14 �, J
AFFECTED. * AR A RT 4)/P
1 oil
AFTER THE BASIN IS CLEANED OUT, AND ALL EROSION DIAMETER = S Q C E W
CONTROL DEVICES REMOVED, THE CONTRACTOR SHALL = SQRT €(2.18) *(4) /3.14j _ 1/2 0 BOLT
CONSTRUCT THE INTERIOR GRADING SHOWN ON THIS SHEET. = 0.94 INCHES EMBEDDED 2 (TYP.)
AN 8" CLAY LINER SHALL BE PROVIDED FOR THE BOTTOM OF = USE 1.0 INCHES 4�' PVC CAP WITH A-J SF;TION A -A
1 DRILL HOLE LL'
ALL STORMWATER WETLAND FACILITIES INCLUDING CUT SLOPES
AND FILL AREAS. THE MAXIMUM PERMEABILITY RATE FOR THE 4" PVC STUBBED
LINER SHALL BE 0.72 CM /DAY. THE PROPOSED MATERIAL INTO BOX
FOR THIS LINER SHALL BE TESTED BY A QUALIFIED
GEOTECHNICAL ENGINEER PRIOR TO PLACEMENT. THE SUBMERGED ORIFICE OUTLET
RESULTS OF THIS TESTING SHALL BE SUBMITTED TO THE NOT TO SCALE
DESIGN ENGINEER FOR REVIEW PRIOR TO PLACEMENT. THE
RESULTS OF THIS TESTING SHALL ALSO BE SUBMITTED TO THE
TOWN OF APEX, NC FOR APPROVAL.
THE CONTOURS, SPOT ELEVATIONS, AND GRADES SHOWN STORMWATER WETLANDS #4 WETLAND AREA DISTRIBUTION
REPRESENT THE FINISH GRADE OF THE WETLAND SYSTEM.
v� W
'--WELDED 1/2" STAINLESS STEEL
BARS WITH 2' SQUARE OPENINGS
TRASH RACK DETAIL m o �
� w �
U) Q O
� rn
i. ALL DISTURBED SUBSOILS SHALL BE TILLED BEFORE CAPPING
WITH A MINIMUM OF 12 INCHES OF TOPSOIL. AREAS OF THE
TOTAL SURFACE AREA:
7219
SF
GRAPHIC SCALE
STORMWATER WETLAND HAVING A PERMANENT POOL DEPTH
40' 0 40' 80'
OF 6 INCHES OR GREATER (E.G., THE FOREBAY AND DEEP
POOL AREAS), WILL BE CAPPED WITH A MINIMUM OF 6 INCHES
REQ.
REQ. SF
PROV..SF
PROVIDED
OF TOPSOIL. NO TILLING SHALL OCCUR WITHIN THE DRIP LINE
FOREBAY
10%
721.9
1032
14.30%
(IN FEET
OF EXISTING TREES. AFTER TILLING IS COMPLETED, NO OTHER
SHALLOW WATER
40%
2887.6
3010
41.70%
1 inch = 40 Pt.
CONSTRUCTION TRAFFIC SHALL BE ALLOWED IN THE AREA,
EXCEPT FOR PLANTING AND RELATED WORK.
SHALLOW LAND
30%
2165.7
2809
38.91%
.STRUCTURAL BMP "AS GUILTS" WILL BE REQUIRED AND
SUBMITTED PRIOR TO FINAL INSPECTION AND RECEIVING PLAT
DEEP POOL
5 -10%
367
5.08%
FOR C
APPROVAL (WITH RESPECT TO A SUBDIVISION) OR CERTIFICATE
OF OCCUPANCY (WITH RESPECT TO A SITE PLAN). THE
AS -BUILT SUBMITTAL SHALL CERTIFY THE STRUCTURAL BMP
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
a
IS CONSTRUCTED IN ACCORDANCE WITH THE APPROVED
SOLELY PER
THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
W
N
CONSTRUCTION PLANS. AS -BUILT SURVEY REQUIREMENTS
FOR THE STRUCTURAL BMP'S SHALL INCLUDE BUT NOT BE
LIMITED TO THE FOLLOWING: CONTRACTOR SHALL PROVIDE
AS -BUILT TOPOGRAPHIC SURVEY PERFORMED BY A
PROFESSIONAL LAND SURVEYOR CERTIFYING STRUCTURAL BMP
AREA DIMENSIONS ELEVATIONS INLET /OUTLET STRUCTURE
HORZ SCALE:
CM-ENGINEERING DATE PUBLIC WORKS- ENV. PROGRAMS DATE
VERT SCALE:
CM-TRANSPORTATION DATE PLANNING DATE DRAWN BY: ACL
CHECKEp E Y: FDR INVERTS, ORIFICE DIAMETER, PIPE SIZES, AND CLEANOUT CM-BUILDING N C I N S DATE PLANNING- I A
LOCATIONS. * *IN THE CASE OF THE PROPOSED STORMWATER DATE: 1-31-08
WETLANDS IT WILL BE NECESSARY TO PROVIDE BOTTOM PUBLIC WORKS -WATER /SEWER A FIR A E '� J �� NO.
ELEVATIONS FOR THE FOREBAYS, DEEP POOLS, SHALLOW 12070308A C1
LAND, AND SHALLOW WATER ZONES **
PUBLIC K- L I A A
CULTURAL RES. SHEET ��'
I I C-9.4
PUBLIC K -S &E DATE--
SHEET OF

PLANT MATERIAL NoTEs
1. All plant material must conform to the current American Standards for Nursery
Stock published by the American Association of Nurserymen.
2. Plant materials should be purchased from certified nurseries that have been
inspected by state or federal agencies.
3. All plant material specified in these plans must be propagated, germinated, or
otherwise developed from nurseries located in the same hardiness zone as the
project site.
4. A 10 -foot turfgrass buffer surrounding the stormwater wetlands shall consist of
Centipede sod.
STORMWATER WETLAND WATER MANIPULATION AND PLANTING NOTES
1. Water management is absolutely critical during plant establishment. Stormwater
wetland facility planting shall not occur between April 1St and October 1St
2. Emergent aquatic plants should be planted during the winter months. After the
initial planting of emergent vegetation, raise the water level to approximately 1
inch above the substrate. Too much water during the initial establishment of new
plants will result in severe stress. Maintain this water level for about one (1)
week. This will inhibit the germination and growth of any weed species that may
be present in the wetland soils.
Location
FARM
Common Name
Botanical Name
Quantity
S1Ze
Spacing
Shallow Water
H
Arrow arum
Peltandra virginica
45
Plug
36" O.C.
H
Yellow flag iris
Iris pseudacorus
40
quart
36" O.C.
• U
H
Giant curly rush
Juncus effusus 'Unicorn'
35
quart
36" O.C.
H
Sweet flag
Acorus calamus
variegatus
30
quart
36" O.C.
T
Bald Cypress
Taxodium distichum
3
2.5 "dbh
as shown
(U
o� 3
Cd
mot- C4
a w Z
4.
C) °-
�z
w�
F- o
Shallow Land
H
White star grass
Dichromena latifolia
45
quart
36" O.C.
o
Z
S
Swamp sunflower
Helianthus angustifolius
45
quart
36" O.C.
S
Rose mallow
Hibiscus coccinea
60
quart
36" O.C.
z
S
Sweetbay magnolia
Magnolia virginica
3
3- gallon
15 -ft. O.C.
S
Inkbery
Ilex glabra
20
3- gallon
5 -ft. O.C.
Z
—
T
Fringe
0
15
1:
T
Ironwood
_
15
Q
PLANTING SOURCE (NURSERY
HERBACEOUS
AMERICAN LOTUS:
ARROW ARCUM:
YELLOW FLAG IRIS:
GIANT CURLY RUSH:
SWEET FLAG:
WHITE STAR GRASS:
SHRUB
ROSE MALLOW:
SWEETBAY MAGNOLIA:
INKBERRY:
WINTERBERRY:
CREEPING BLUEBERRY:
TREES
BALD CYPRESS:
IRONWOOD:
FRINGE.
RED MAPLE:
MELLOW MARSH
FARM
COASTAL PLAIN
CONSERV. NURSERY
COASTAL PLAIN
CONSERV. NURSERY
PLANT DELIGHTS
PITTSBORO, NC
COASTAL ' PLAIN
CONSERV. NURSERY OR (MMF)
PLANT DELIGHTS
DATE
MELLOW MARSH
FARM OR PLANT DELIGHTS
CURE NURSERY,
PITTSBORO, NC
CURE NURSERY,
PITTSBOR09 NC
CURE NURSERY,
PITTSBORO, NC
CURE NURSERY,
PITTSBORO, NC
TAYLOR'S NURSERY, RALEIGH, NC
CURE NURSERY, PITTSBORO, NC
CURE NURSERY, PITTSBORO, NC
CURE NURSERY, PITTSBORO, NC
STORMWATER WETLAND#2 — PLANTING PLAN
SCALE: 1" = 10'H
PUBLIC WORKS- WATER /SEWER
CULTURAL RES.
Cn
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20'
W00**0TION
AND APPROVED
TRUCTION PLANS.
kOR SUA7E:
aA
VERT SCALE:
DATE
t�3
C O
N
CHECKED BY: FDR
DAT
DATE: 1 -31 -08
DATE
PROJECT N(3.
12070308A c1
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20'
W00**0TION
AND APPROVED
TRUCTION PLANS.
kOR SUA7E:
SHEET NO.
C-9.6
SHEET OE
DATE
VERT SCALE:
DATE
DRAWN BY: ACL
CHECKED BY: FDR
DAT
DATE: 1 -31 -08
DATE
PROJECT N(3.
12070308A c1
SHEET NO.
C-9.6
SHEET OE

STORMWATER WETLAND#3 - PLANTING PLAN,
SCALE: 1" = 70'H
Location
Symbol
Common Name
Botanical Name
Quantity
Size
Spacing
Shallow
Water
H
Arrow arum
Peltandra virginica
120
plug
36" O.C.
DATE
H
Yellow flag iris
Iris pseudacorus
75
quart
36" O.C.
H
Giant curly rush
Juncus effusus 'Unicom,
90
quart
36" O.C.
H
Sweet flag
Acorus calamus
variegatus
60
quart
36" O.C.
H
Arrowhead
Sagittaria sp.
70
quart
36" O.C.
T
Bald Cypress
Taxodium distichum
20
1.5" dbh
20'0.C.
Shallow Land
H
White star grass
Dichromena latifolia
120
quart
36 " O.C.
S
Swamp sunflower
Helianthus angustifolius
175
1 gal.
36" O.C.
S
Rose mallow
Hibiscus coccinea
135
quart
36" O.C.
S
Winterbery
Ilex verticillata
12
3- gallon
7 -ft. O.C.
S
Sweetbay
magnolia
Magnolia virginica
6
3- gallon
15 -ft. O.C.
S
Inkberry
Ilex glabra
15
3- gallon
54 O.C.
NOTES:
IT IS RECOGNIZED THAT A HIGHER # TREES OF 1.5" DBH ARE REQUIRED PER THE DWQ
BMP SUPPLEMENT; HOWEVER, THE FOLLOWING IS ALSO TRUE:
1. NUMBER OF HERBACEOUS PLANTINGS PROPOSED SIGNFICANTLY EXCEEDS THE
REQUIREMENT.
2. TREES PROPOSED WILL HAVE A MUCH LARGER SIZE AT TIME OF PLANTING (2.5 "dbh
NOT 1.5 ") THAN REQUIRED. THESE LARGER PLANTINGS WILL PROVIDE A HIGHER,
MORE EFFICIENT LEVEL OF NUTRIENT UPTAKE.
3. THE WETLAND IS PROPOSED ADJACENT TO THE EXISTING NEUSE RIVER BUFFER
WHICH ALREADY HAS A SIGNFICANT QUANTITY OF EXISTING VEGETATION.
REFER TO TOWN OF APEX DESIGN AND DEVELOPMENT MANUAL
FOR ADDITIONAL PLANTING SPECIFCATIONS AND REQUIREMENTS
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PLANT MATERIAL NoTEs
1. All plant material must conform to the current American Standards for Nursery . .
Stock published by the American Association of Nurserymen. O
2. Plant materials should be purchased from certified nurseries that have been cy
� a�
inspected by state or federal agencies. o
3. All plant material specified in these plans must be propagated, germinated, or
otherwise developed from nurseries located in the same hardiness zone as the _ M
project site. O �
4. A 10 -foot turfgrass buffer surrounding the stormwater wetlands shall consist of
Centipede sod. U U
STORMWATER WETLAND WATER MANIPULATION AND PLANTING NOTES'
U � O
1. Water management is absolutely critical during plant establishment. Stormwater N
wetland facility planting shall not occur between April 1st and October 1St. O ,�
2. Emergent aquatic plants should be planted during the winter months. After the o Q
initial planting of emergent vegetation, raise the water level to approximately 1 � M
pp y oo ..�
inch above the substrate. Too much water during the initial establishment of new v
plants will result in severe stress. Maintain this water level for about one (1) ° o � p Ln w Z 3
week. This will inhibit the germination and growth of any weed species that may 3
• be resent in the wetland soils.
p ....� �, ..
3. Continue to gradually increase the water depth over the next 20 -30 days if the b�1p X
plants are not showing stress. The goal is to inundate the transition zone between
wetland and upland as much as possible to control any invading plant species. p
4. During the remainder of the growing season, adjust the water level 10! e y w z
community type (e.g., deep pool, shallow water, and shallow land). ��
water level if weed problems surface lower the water level to enco emer ent wetland lant rowth ands read. o =
g p g P � •�
o
• PLANTING SOURCE (NURSERY)
HERBACEOUS C
AMERICAN LOTUS: MELLOW MARSH FARM Z Z
ARROW ARCUM: COASTAL PLAIN CONSERV. NURSERY X
YELLOW FLAG IRIS: COASTAL PLAIN CONSERV. NURSERY W Q
Z
GIANT CURLY RUSH: PLANT DELIGHTS
SWEET FLAG: COASTAL PLAIN CONSERV. NURSERY OR (MMF)
WHITE STAR GRASS: PLANT DELIGHTS J UL
0 (D
SHRUB
Z Z
ROSE MALLOW: MELLOW MARSH FARM OR PLANT DELIGHTS 3:
SWEETBAY MAGNOLIA: CURE NURSERY, PITTSBORO, NC Z
• INKBERRY: CURE NURSERY, PITTSBORO, NC z
WINTERBERRY. CURE NURSERY, PITTSBORO, NC
CREEPING BLUEBERRY: CURE NURSERY, PITTSBORO, NC Q
TREES
BALD CYPRESS: TAYLOR'S NURSERY, RALEIGH, NC
IRONWOOD: CURE NURSERY, PITTSBORO, NC co
FRINGE: CURE NURSERY, PITTSBORO, NC
RED MAPLE. CURE NURSERY, PITTSBORO, NC
Z
Q
W
3:
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F-
. 0 z
D
00 0
N �
O
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W
U)
GRAPHIC SCALE
10' 0 10' 20'
{ IN FEET }
1 inch = 10 ft.
I FOR CONSTRUCTION 1:..
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS.
PUBLIC WORKS- WATER /SEWER
CULTURAL RES.
SHEET NQ.
C--9.7
SHEET OF
HORZ SCALE:
ORKS- ENV. PROGRAMS
DATE
VERT SCALE:
DATE
DRAWN BY: ACL
t;
CHECKED ��: FDR
—TRANSPORTATION
A
;SATE: 1 -31 -08
DATE
PROJECT NO.
12070308A C1
CULTURAL RES.
SHEET NQ.
C--9.7
SHEET OF

STREET TREE (TYP)
4V \P
0 /
i
i
i
STORMWATER WETLAN #4 - PLANTING PLAN.
SCALE: 1" = 10'H
Location
Symbol
Common Name
Botanical Name
Quantity
Size
Spacing
Deep Pool
American lotus
Nelumbo lutea
5
quart
36 " O.C.
Bald cypress
Taxodium distichum
2
2.5" dbh B &B
as shown
Shallow
Water
Arrow arum
Peltandra virginica
75
plug
36" O.C.
Yellow flag iris
Iris pseudacorus
50
quart
36" O.C.
Giant curly rush
Juncus effusus 'Unicom'
50
quart
36" O.C.
Sweet flag
Acorus calamus
variegatus
25
quart
36" O.C.
Shallow Land
White star grass
Dichromena latifolia
60
quart
36 " O.C.
Swamp sunflower
Helianthus angustifolius
25
quart
36" O.C.
Rose mallow
Hibiscus coccinea
85
quart
36" O.C.
Sweetbay
magnolia
Magnolia virginica
8
3- gallon
15 -ft. O.C.
Inkberry
Ilex glabra
12
3- gallon
5 -ft. O.C.
Winterberry
Ilex verticillata
5
3- gallon
5 -ft. O.C.
Creep. blue
Vaccimium crassifolium
50
1- gallon
24" O.C.
NOTES:
IT IS RECOGNIZED THAT A HIGHER # TREES OF 1.5" DBH ARE REQUIRED PER THE DWQ
BMP SUPPLEMENT; HOWEVER, THE FOLLOWING IS ALSO TRUE:
1. NUMBER OF HERBACEOUS PLANTINGS PROPOSED SIGNFICANTLY EXCEEDS THE
REQUIREMENT.
2. TREES PROPOSED WILL HAVE A MUCH LARGER SIZE AT TIME OF PLANTING (2.5 "dbh
NOT 1.5 ") THAN REQUIRED. THESE LARGER PLANTINGS WILL PROVIDE A HIGHER,
MORE EFFICIENT LEVEL OF NUTRIENT UPTAKE.
3. THE WETLAND IS PROPOSED ADJACENT TO THE EXISTING NEUSE RIVER BUFFER
WHICH ALREADY HAS A SIGNFICANT QUANTITY OF EXISTING VEGETATION.
REFER TO TOWN OF APEX DESIGN AND DEVELOPMENT MANUAL
FOR ADDITIONAL PLANTING SPECIFCATIONS AND REQUIREMENTS
3 I 0
(n
Z
0
V)
LLJ
0
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V)
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LAJ ;n
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PLANT MaTExIAi, Notes
a�
STREET TREE (TYP) 1. All plant material must conform to the current American Standards for Nursery
CENT DE o Stock published by the American Association of Nurserymen. � o
2. Plant materials should be purchased from certified nurseries that have been
inspected by state or federal agencies.
3. All plant material specified in these plans must be propagated, germinated, or
otherwise developed from nurseries located in the same hardiness zone as the
project site. p �
� 4. A 10 -foot turfgrass buffer surrounding the stormwater wetlands shall consist of U �
Centipede sod. U 0 U
STORMWATER WETLAND WATER MANIPULATION AND PLANTING NOTES
• 1. Water management is absolutely critical during plant establishment. Stormwater
wetland facility planting shall not occur between April I" and October Is'. O ,� -l::s"
2. Emergent aquatic plants should be planted during the winter months. After the .�? � o o � � o
initial planting of emergent vegetation, raise the water level to approximately 1 . � � � � � v
� inch above the substrate. Too much water during the initial establishment of new p a � N � o
0
plants will result in severe stress. Maintain this water level for about one (1) h � � z
� �'
week. This will inhibit the germination and growth of any weed species that may � � •� � ..�
°';o�a�rn 3
> � be present in the wetland soils.
3. Continue to gradually increase the water depth over the next 20 -30 days if the � � ° � 4 M 4+2
� 0 plants are not showing stress. The goal is to inundate the transition zone between
t_� 30 ROSE 0 wetland and upland as much as possible to control any invading plant species. �� o
0 20 CURLY 0 MALLOW o � �
Ruses {} \ 4. During the remainder of the growing season, adjust the water level to the desired W
U 0 Q � fl community type (e.g.,, deep pool, shallow water, and shallow land). Raise the a �
C.� water level if weed problems surface; lover the water level to encourage v U
emergent wetland plant growth and spread. �
DW
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s PLANTING SOURCE (NURSERY). ¢ �
HERBACEOUS
AMERICAN LOTUS: MELLOW MARSH FARM U
ARROW ARCUM: COASTAL PLAIN CONSERV. NURSERY �^ z z
fly YELLOW FLAG IRIS: COASTAL PLAIN CONSERV. NURSERY
GIANT CURLY RUSH: PLANT DELIGHTS ��J W Q
SWEET FLAG: COASTAL PLAIN CONSERV. NURSERY OR (MMF)
WHITE STAR GRASS: PLANT DELIGHTS < Q
\
SHRUB �^ Q
ROSE MALLOW: MELLOW MARSH FARM OR PLANT DELIGHTS L.L
\ SWEETBAY MAGNOLIA: CURE NURSERY, PITTSBORO, NC 7 � Z
/ INKBERRY: CURE NURSERY, PITTSBORO, NC � L O
WINTERBERRY: CURE NURSERY, PITTSBORO, NC ��n��}� Fm- z
CREEPING BLUEBERRY: CURE NURSERY, PITTSBORO, uv
TREES
\ BALD CYPRESS: TAYLOR'S NURSERY, RALEIGH, FEB
/ IRONWOOD: CURE NURSERY, PITTSBORO, NC
\ FRINGE: CURE NURSERY, PITTSBORO, NC WA.�R.QUAU'�'r
RED MAPLE: CURE NURSERY, PITTSBORO, NC_�s��p��µWA� �• n/
U)
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UJ
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0 ry
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6— FRINGEiREE O 15' O.C. / U)
GRAPHIC SCALE
/ 10' 0 10' 20'
C (IN FEET )
/ 1 inch = 10 Pt.
FOR CONSTRUCTION......
.. .. ... ......
. ... .. .... .. ..........
.... ... ........
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HAS BEEN REVIEWED AND APPROVED Q
SOLELY PER THE CERTIFICATIONS SIGNED ON THE COVER SHEET OF THESE CONSTRUCTION PLANS. N
HORZ SCALE:
CM-ENGINEERING DATE PUBLIC WORKS-ENV.PROGRAMS DATE
VERT SCALE:
CM— TRANSPORTATION DATE PLANNING A DRAWN BY; ACL
*CM-BUILDING INSPECTIONS DATE PLANNING- TRANSPORTATION DATE CHECKED BY; FDR
DATE: 1 -31 -08
PUBLIC WORKS- WATER /SEWER DATE­ FIRE DATE PROJECT N0.
12070308A C1
'PUBLIC SHEET N0.
CULTURAL RES. C-9.8
PUBLIC K -&
SNcET OF