20140209 Ver 1_SMP 9 Bio#2 REVISED_20210412

CB
#22
- EXTEND 4'-1 5" RCP
(INV. =339.50)
BOTTOM SURFACE
AREA = 2,327 5F
(ELEV. =338.8)
FOREBAY
REMOVE EX. 15" FES
I 3
NEW VAR. PUBLIC
DRAINAGE EASE.
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STRUCTURAL BMP CONSTRUCTION SEQUENCE:
THE FOLLOWING MUST OCCUR PRIOR TO FINAL PLAT AND/OR CERTIFICATE OF OCCUPANCY (CO):
I . ALL STRUCTURAL BMPS MUST BE INSTALLED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION DRAWINGS.
2. THE DESIGN ENGINEER MUST SUBMIT AN AS -BUILT PACKAGE WHICH MEETS ALL REQUIREMENTS PRESENTED IN THE
TOWN SPEC BOOK INCLUDING A SIGNED AND SEALED CERTIFICATION STATEMENT.
3. SUBMIT THE APPROPRIATE SIGNED STRUCTURAL BMP O$M AGREEMENT AND MAINTENANCE GUARANTEE TO THE
DEVELOPMENT PROJECTS COORDINATOR IN CONSTRUCTION MANAGEMENT AT 249-3394.
4. A FINAL INSPECTION BY THE ENVIRONMENTAL PROGRAMS MANAGER SHALL BE CONDUCTED ONCE THE AS -BUILT
SUBMITTAL HAS BEEN RECEIVED. ONCE APPROVED, THE ENVIRONMENTAL PROGRAMS MANAGER WILL SEND A BMP
APPROVAL LETTER TO THE OWNER.
5. IN LIEU OF STRUCTURAL BMP COMPLETION AND FINAL APPROVAL BY THE ENVIRONMENTAL PROGRAMS MANAGER, THE
TOWN MAY ACCEPT A PERFORMANCE GUARANTEE IN ACCORDANCE WITH UDO SECTION G. I . 12(G). IF THE CONTRIBUTING
DRAINAGE AREA FOR THE BMPS IS UNSTABLE AT THE TIME OF FINAL PLAT APPROVAL FOR A SUBDIVISION, THE TOWN
WILL ALLOW A SKIMMER SYSTEM TO BE CONNECTED TO THE EMERGENCY DRAIN SIZED TO DE -WATER THE VOLUME OF
THE BASIN OVER A 2-3 DAY PERIOD. POROUS BAFFLES SHALL EITHER CONTINUE TO BE MAINTAINED (IF CONVERTING
FROM A SEDIMENT BASIN) OR BE INSTALLED. ANY ORIFICES MUST BE CAPPED OR PLUGGED.
6. ALL STRUCTURAL BMPS ARE REQUIRED TO BE COMPLETED PRIOR TO A FINAL CO FOR A SITE PLAN AND ISSUANCE OF
90% OF COS WITHIN A SUBDIVISION. IF THE SUBDIVISION IS TO BE PHASED, ALL STRUCTURAL BMPS SHALL BE
COMPLETED PRIOR TO ISSUANCE OF 90% OF COS WITHIN THAT PHASE.
7. IF A STRUCTURAL BMP COUNTS TOWARDS RCA, THE REQUIRED LANDSCAPING SHALL BE INSTALLED DURING THE
APPROPRIATE GROWING SEASON AND COORDINATED WITH THE TOWN ZONING COMPLIANCE OFFICER AT 249-3426.
L
T---1-----1-J
I I I
I _ I I
L _____I 1
TOP OF NERM
=341 .30
SLOF'ES ABOVE
RETAINING WALL
AKEAT2:I
SWALE
TO DRAIN
RETAINING
WALL (31±)
4" PVC
(TPYI CAL)
TREE
PROTECTION
FENCE (TYP)
CLEAN -OUT
(TYPICAL)
1 / STORMWATER BMP
1-7' ACCESS $ MAINTENAI
/';i/ EASEMENT
1 fit
,/
ItKGENCY
,/SPILLWAY$
RIP -RAP BLANKET
5/
G" PVC
INV.=
335.OG
1 G�
Geogqd In
H" Min. Lnw Permeable Soil
Aparnxlm ie •
Limits ci
E%CavatteB
RetaInod
Per CO appitealions, cr as
directed by gentechnical engineer
When s to Gondillans require, --
place drainage. mmpneIte
Miraii G 1 Wii !or nenneaient}
Installed to 23 watt height
and ?O% c verage.
4" Periwatnd PVC D ainacie T'6c..,,.
Ou#S$1 every
(v<hen Site C,ntlilienn i1*/ // rs)
See tuck below.
4" Petfornlcd PVC or
NUPE CIrainape Tye.
:Outlet every iCr 0.C.
Np;9:
Au d(racted by $nOws. when rlb, eend"lorfs iequbi , WTsp
drain w t to in mu.. it97 wttebecl eiWKt end 9ca. nerenv 1 111 913
Fabric end piswtth dratnege s7mupcxtte or sitUrnklett bode drain
erriern.
Typical Reinforced Wall Sactlon
Cap tlntt
MI; Drainage Fill
(3/4° Ctvshed
Rock nr Stone)
When silo oand192ns dictate, ex
es directed by ctvti geoiecnnical
engineer, piDatl rip rap stone luyu
ernnion t/ntrn#
siuhuc Grarte
A
AC1TY OP
NOTES:
I . RETAINING WALLS MUST BE A MEDIUM OR DARK BROWN OR RUST COLOR.
2. RETAINING WALL DETAIL REPRESENTS THE WALL TYPE TO BE USED AT THIS 5CM.
5IOETENTION LAYOUT:
STANDARD C.OSS-SECTION
PERMENANT
CLEANOUT POST W/
CLEANOUT MARK
-WATER TABLE-
STABILIZE BOTTOM
AND SLOPES WITH
CENTIPEDE SOD
1I 2" PONDING
FILL SOIL MEDIA
MIX: 55-88% SAND,
8' 12% FINES,
3-5%a ORGANIC
DEPTH: TREES/5111RU65=3ft.
GRASS=2ft.
4 UYA5,I IW SAND;:.
CAPPED CLEAN
OUT PIPE
-FILTER FABRIC_
(OR CHOKING -
STONE) -
-UNDERDRN I I I I I I
Ili iIRAI-III III III III=
03/09/21 REVISION:
THE PURPOSE OF THIS REVISION 15 TO APPROVE THE GRADING AND
RETAINING WALLS NECESSARY TO PROVIDE 3:1 INTERIOR SLOPES FOR
THE SCM. THE SCM DESIGN PARAMETERS SHALL BE CONFIRMED BY
THE CONTRACTOR. FOR CERTIFICATION. ANY LANDSCAPING PLANTINGS
IMPACTED BY GRADING SHALL BE REPLACED.
BIORETENTION AREA
DESIGN
MINIMUM WEIR
LENGTH (FT)
10
UNDERDRAIN PIPE
DIAMETER (IN)
4
MINIMUM NUMBER OF
UNDERDRAIN PIPES
4
CLEANOUT
ELEVATION (FT)
339.05
TOP OF BIORETENTION
SOIL MIXTURE ELEV. (FT)
338.80
BOTTOM OF BIORETENTION
SOIL MIXTURE ELEV. (FT)
336.80
SPILLWAY (WEIR)
ELEVATION (FT)
340.30
TOP OF BERM
ELEVATION (FT)
34 I .30
MINIMUM
DEPTH= 1 2"
RIP -RAP
Dso=6"
O
BOTTOM WIDTH = 2'
WITH GEOTEXTILE LINER
•
EXISTING
GROUND
EMERGENCY SPILLWAY DITCH DETAIL
N.T.S.
UNDERDRAIN PIPE SHALL BE SCHEDULE 40 PVC,
SDR35, OR SMOOTH WALL CORRUGATED PLASTIC
PIPE WITH %' PERFORATIONS AT 6" ON CENTER. (4
HOLES PER ROW) REFER TO TABLE FOR PIPE SIZE.
CLASS "C"
GEOTEXTILE
FABRIC AROUND
WASHED STONE
UNDERDRAIN PIPE
TO BE INSTALLED AT
0.5% MIN. SLOPE
NATIVE SOIL, NO
COMPACTION
WALLrvIry
ENGINEERED FILL
MATERIAL
HDPE
CLEANOUT
100-YEAR STORM EL = 340.8
I0-YEAR STORM EL - 340.6 -
I -MAR STORM EL - 340.4
TOP OF
BIORETENTION
POND
BOTTOM OF
ENGINEERED FILL
MATERIAL
PERMEABLE FILTER
FABRIC LINING ENTIRE
BIORETENTION CELL
WASHED 57 STONE
ENVELOPE
UNUNED SLOTTED
HOPE UNDERDRAIN
PERMEABLE FILTER
FABRIC OVER ENVELOPE
TOP OF EARTH DAM
EL-. 341.3
TOP OF EMERGENCY SPILLWAY
EL - 340.3
OUTLET PIPE
INVERT OUT
BIO-RETENTION BMP CROSS-SECTION (N.T.5.)
NOTES:
I . ALL MATERIALS AND METHODS OF CONSTRUCTION SHALL BE IN ACCORDANCE WITH TOWN OF
APEX STANDARDS AND SPECIFICATIONS.
2. BOUNDARY TAKEN FROM A DIGITAL FILE PROVIDED BY BARRY SCOTT SURVEY COMPANY.
3. TOPOGRAPHIC INFORMATION TAKEN FROM WAKE COUNTY GIS FILES.
4. THIS SITE HAS BEEN REVIEWED FOR WETLANDS AND STREAM BUFFERS BY ENVIRONMENTAL
SERVICES INC. AND THE DELINEATED ENVIRONMENTAL FEATURES HAVE BEEN SHOWN.
5. PER FEMA MAP #37200721 OOJ DATED 02 MAY 200G, NO 100-YEAR FLOODPLAIN TRAVERSES THE
PROPERTY.
G. CONTRACTOR SHALL HAVE NORTH CAROLINA ONE CALL (1 -800-632-4949) LOCATE ALL
EXISTING UTILITIES PRIOR TO BEGINNING CONSTRUCTION.
7. THIS SITE IS LOCATED WITHIN THE PRIMARY WATERSHED PROTECTION OVERLAY DISTRICT.
8. THE BIO-RETENTION AREA SHALL BE LOCATED WITHIN A DRAINAGE EASEMENT WITH ACCESS TO
A PUBLIC RJW.
9. THE BACKFILL OF THE 4-INCH OUTLET PIPES FROM THE BIO-RETENTION CELLS SHALL BE
COMPACTED TO A MINIMUM OF 95% OF STANDARD PROCTOR. (ASTM D698).
10. RETAINING WALLS SHALL BE SEGMENTED BLOCK TINTED MEDIUM OR. DARK BROWN OR. RUST IN
COLOR. ALL PERMITTING WILL BE HANDLED AS A SEPARATE SUBMTTAL.
1 I . FENCING SHALL BE INSTALLED AT THE TOP OF RETAINING WALLS IF REQUIRED BY THE BUILDING
CODE.
1 2. CONTRACTOR SHALL CONFIRM THAT FILL SOILS USED FOR SCM CONSTRUCTION HAVE BEEN
ADQUATELY COMPACTED.
REFER TO GRADING
PLAN FOR TOP OF
DAM ELEVATION
<\\/,\\/\//�\/j 3 11.1.
_NEL 5' WEIR LENGTH
REFER TO GRADING
PLAN FOR SPILLWAY
ELEVATION
SPILLWAY BOTTOM AND
SLOPES TO BE STABILIZED
WITH PERMANENT EROSION
CONTROL MAT
I ,I, 3 /\�//>//\ v�//\;
PERMANENT EROSION MAT TO BE
P-300 BY NORTH AMERICAN GREEN,
MIRAMAT BY MIFAFI CORP., OR
APPROVED EQUAL
SECTION TH OUGr1 SPILLWAY (NTS)
BIORETENTION SOIL NOTES:
BIORETENTION SOIL MIXTURE (BSM): SHALL BE PLACED AND GRADED USING LOW GROUND -CONTACT PRESSURE
EQUIPMENT OR. BY EXCAVATORS AND/OR BACKHOES OPERATING ON THE GROUND ADJACENT TO THE BIORETENTION
FACILITY. NO HEAVY EQUIPMENT SHALL BE USED WITHIN THE PERIMETER OF THE BIORETENTION FACILITY BEFORE,
DURING, OR AFTER THE PLACEMENT OF THE BSM. THE BSM SHALL BE PLACED IN HORIZONTAL LAYERS NOT TO
EXCEED 12 INCHES FOR THE ENTIRE AREA OF THE BIORETENTION FACILITY. THE BSM SHALL BE COMPACTED BY
SATURATING THE ENTIRE AREA OF THE BIORETENTION FACILITY AFTER EACH LIFT OF BSM 15 PLACED UNTIL WATER
FLOWS FROM THE UNDERDRAIN. WATER FOR SATURATION SHALL BE APPLIED BY SPRAYING OR SPRINKLING. AN
APPROPRIATE SEDIMENT CONTROL DEVICE SHALL BE USED TO TREAT ANY SEDIMENT -LADEN WATER DISCHARGED
FROM THE UNDERDRAIN. IF THE BSM BECOMES CONTAMINATED DURING THE CONSTRUCTION OF THE FACILITY, THE
CONTAMINATED MATERIAL SHALL BE REMOVED AND REPLACED WITH UNCONTAMINATED MATERIAL AT NO ADDITIONAL
COST TO THE ADMINISTRATION. FINAL GRADING OF THE BSM SHALL BE PERFORMED AFTER A 24-HOUR SETTLING
PERIOD. FINAL ELEVATIONS SHALL BE WITHIN 2 INCHES OF ELEVATIONS SHOWN ON THE CONTACT PLANS.
THE BIORETENTION SOIL MIXTURE (BSM) SHALL BE A UNIFORM MIX, FREE OF STONES, STUMPS, ROOTS, OR. OTHER
SIMILAR. OBJECTS LARGER THAN 2 INCHES EXCLUDING MULCH. NO OTHER MATERIALS OR. SUBSTANCES SHALL BE
MIXED OR. DUMPED WITHIN THE BIORETENTION AREA THAT MAY BE HARMFUL TO PLANT GROWTH, OR. PROVE A
HINDRANCE TO THE PLANTING OR MAINTENANCE OPERATIONS.
PRIOR TO PLACING THE UNDERDRAIN AND THE BSM, THE BOTTOM OF THE EXCAVATION SHALL BE ROTO-TILLED TO A
MINIMUM DEPTH OF 6 INCHES TO ALLEVIATE ANY COMPACTION OF THE FACILITY BOTTOM. ANY SUBSTITUTE
METHOD FOR ROTO-TILLING MUST BE APPROVED BY THE ENGINEER PRIOR TO USE. ANY PONDED WATER. SHALL BE
REMOVED FROM THE BOTTOM OF THE FACILITY AND THE SOIL SHALL BE FRIABLE BEFORE ROTO-TILLING.
DESIRED BIORETENTION SOIL MIXTURE PH LIES BETWEEN 5.5 AND 6.5.
0 10 20
40
G.API-11C SCALE
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.
N/A
rdalton 04/13/2021 5:03:57 PM
PW - TRANSPORTATION
N/A
sewens 04/19/2021 8:26:28 AM
BUILDING INSPECTIONS
N/A
/31110n 04/19/2021 10:31:03 AM
WR - UTILITY ENGINEERING
N/A
rsmith 04/12/2021 2:02:19 PM.
ELECTRIC
N/A
WR-5SE
,rvn0 Approved
DATE WR - STORMWATER
DATE
oved
aeo, 1Pr20
noa1211 "e PM
PLANNING
N
,b ryaA,a4„a0M
DATE
DATE
DATE PLANNING - TRANSPORTATION
N/A
khuegerich 04/12/2021 3:22:25 PM
DATE FIRE
N/A
areincke 04/12/2021 1:22:35 PM
DATE PARKS, RECREATION CULTURAL RES.
DATE
DATE
DATE
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en
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Construction Management
Civil Engineering
221 N. SALEM ST.
SUITE 001
PO BOX 1062
APEX, NC 27502
Office: 919-387-1174
Registratlon: P-0151
www.jonescnossen.com
TOWN OF APEX
SCALE
I "=20'
DATE
5IO-KETENTION
DRAWN
SMJ
FEBRUARY 4, 2014
REVISION
03/13/14
SHEET
PROJECT
1 st TRC COMMENTS
POND GRADING
GRADING REVISION
TRC COMMENTS
TRC COMMENTS
9
I302