20140209 Ver 1_9 Bio-Retention 2_20211130

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CB
#22
BOTTOM SURFACE
AREA = 2,327 SF
(ELEV.=338.8)
FOREBAY
REMOVE EX. 15" FE5
$ EXTEND 4'- 15" RCP
(INV.=339.50)
NEW VAR. PUBLIC
DRAINAGE EASE.
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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 B5M IS
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 B5M
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 (B5M) 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.
STRUCTURAL BMP CONSTRUCTION SEQUENCE:
THE FOLLOWING MUST OCCUR PRIOR TO FINAL PLAT AND/OR CERTIFICATE OF OCCUPANCY (CO):
I . ALL STRUCTURAL MAPS 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 . 1 2(G). IF THE CONTRIBUTING
DRAINAGE AREA FOR THE BMPS I5 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.
G. 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 15 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___ I
----r----1-----J
I I I-
I 1 I
_
L_ - _ 1
I--- - - - --I
SLOPES ABOVE
RETAINING WALL
ARE AT2:I
SWALE
TO DRAIN
RETAINING
WALL (3'±)
4" PVC
(TPYI CAL)
-------------------------__________ rw-r=33
TW=34I .5 - -
--
TOP Ofg5ERM
=34 I .30
EXCAVATE $ REPLACE SOFT
50IL4 WITh FABRIC
RIP -RAP TREATMENT
4�
TREE
PROTECTION
FENCE (TYP)
CLEAN -OUT
(TYPICAL)
740. '
jj
' I 1 �STORMWATEK BMP
ACCESS $ MAINTENAI
EASEMENT
GENCY
SPILLWAY $
RIP -RAP BLANKET
Approximate
Limits of
Excavation.
For cut appiire
directed by geotechnlcal enginecxe
when elle dark:Mk: s require, ---
place Ceakrage rxtmixiaiie
wt£raii G 100N (or equivalent)
inntailei to 213 wit height
and 30% owernae.
Gec
.Cap Unit
4* Perforated PVC Drainage Tile.
Outlet every 5O O.C.
(when Sitrr Coedyk)ne Require)
See mate below.
4` Perforated PVC cr.
HOPE Drainage Ti16.
Wet every 50` O.C.
Aa dligr?ited by (HVYTTRAt wileri elte contilthxof iT+viv, wwtl
drFikaegrrtfia tf3 #5r° zrr 1/97 moiled atone and Bez. Der/awn/1 Miff
tabrlt: and Wax"e) w1l11 dia£rrego mitiprAtto cw yatn bart drein
ly&tarn..
Typical Reinforced Wail Suction
Unit Drainage Fill
(314" Cruehed
Rea. or Stone)
nGt?tDna dictate, Nr
tlidl or geate;hnical
F£niahad Grade
Urlrelnfo 'J Crze1
rat Crdstied Slrlrre
Leveling Pad
F IN13 C/lPAClTY OF
PBSUMED
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.
3. RETAINING WALL DESIGN WILL BE BY OTHERS.
12" DEEP
RIP -RAP
(CLASS B )\
GEOTEXTILE LINER
PINNED AT TOP AND
BOTTOM OF SLOPE
NOTES:
I . SLOPE SURFACE TO BE REVIEWED BY GEOTECHNICAL ENGINEER FOR POSSIBLE
IMPROVEMENT PRIOR TO PLACEMENT OF FABRIC AND RIP -RAP.
2. RIP -RAP SHALL EXTEND TO THE EDGE OF THE GEOTEXTILE LINER.
FADRIC $ RIP -AP DETAIL
N.T.5.
G" PVC
INV.=335.0G
$ RIP -RAP PAD
\IG
1
BIOETENTION LAYOUT:
STANDARD COSS-SECTION
PERMENANT
CLEANOUT POST WI
CLEANOUT MARK
11
STABILIZE BOTTOM
AND SLOPES WITH
CENTIPEDE SOD
L-
FILL SOIL MEDIA
MIX: 85-83% SAND,
8 12% FINES,
3-5% ORGANIC
DEPTH• TKEE5/5hRU65 3ft.
GP.ASS=2ft.
-IN I SITU
SOIL
I TO WATERNCE:
TABLE
-UNDERDRAIN
CAPPED CLEAN
OUT PIPE
-WATER TABLE-
BIORETENTION AREA
AS -BUILT
REVISION
MINIMUM WEIR
LENGTH (FT)
10
10
UNDERDRAIN PIPE
DIAMETER (IN)
4
4
MINIMUM NUMBER OF
UNDERDRAIN PIPES
4
4
CLEANOUT
ELEVATION (FT)
338.7
339.05
TOP OF BIORETENTION
SOIL MIXTURE ELEV. (FT)
338.0
338.80
BOTTOM OF BIORETENTION
SOIL MIXTURE ELEV. (FT)
336.0
336.80
SPILLWAY (WEIR)
ELEVATION (FT)
339.59
340.30
TOP OF BERM
ELEVATION (FT)
34 I .07
341.30
MINIMUM
DEPTH= 1 2"
RIP -RAP
Dso=6" 2•\, ,>,
BOTTOM WIDTH = 2'
WITH GEOTEXTILE LINER
NOTE:
RIP -RAP SHALL EXTEND TO THE EDGE OF THE GEOTEXTILE LINER.
EXISTING
GROUND
EMERGENCY SPILLWAY DITCH DETAIL
N.T.5.
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,
1 2"
BIORETENTION SOIL
CLASS "C"
GEOTEXTILE
FABRIC AROUND
WASHED STONE
#57 STONE
UNDERDRAIN PIPE
TO BE INSTALLED AT
0.5% MIN. SLOPE
NATIVE SOIL, NO
COMPACTION
UNDERDRAIN CROSS SECTION (NTS)
WALL�virv�
ENGINEERED FILL
MATERIAL
HDPE
CLEANOUT
100-YEAR STORM EL - 340.8
M'41' I 0-YEAR STORM EL - 340.6
I -YEAR STORM EL - 340.4
TOP OF
BIORETENTION
POND
BOTTOM OF
ENGINEERED FILL
MATERIAL
PERMEABLE FILTER
FABRIC LINING ENTIRE
BIORETENTION CELL
WASHED 57 STONE
ENVELOPE
iimermainuirms
UNUNED SLOTTED
HDPE UNDERDRAIN
PERMEABLE FILTER
FABRIC OVER ENVELOPE
TOP OF EARTH DAM
EL = 341.07
TOP OF EMERGENCY SPILLWAY
EL = 339.59
OUTLET PIPE
INVERT OUT
BIO-RETENTION BMP CROSS-SECTION (N.T.S.)
MINIMUM
DEPTH= 12"
BOTTOM WIDTH = 2'
WITH JUTE MESH LINER
SWALE DETAIL
N.T.S.
EXISTING
GROUND
NOTES:
1. 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 2006,
NO 100-YEAR FLOODPLAIN TRAVERSES THE PROPERTY.
6. CONTRACTOR SHALL HAVE NORTH CAROLINA ONE CALL
(1-800-632-4949) LOCATE ALL EXISTING UTILITIES PRIOR TO
BEGINNING CONSTRUCTION.
7. THIS SITE I5 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 RAM.
9. THIS 5CM WAS CERTIFIED ON 05/05/20 BUT NOT ACCEPTED
BY THE TOWN OF APEX BECAUSE THE MADISON HOA
OBJECTED TO PROVIDING A LETTER ACCEPTING MAINTENANCE
OF THE CONSTRUCTED EMBANKMENT SLOPES.
BIORETENTION CELL: EOREBAY DETAIL
GRASS
18"
CLASS B RIP -RAP
Dso= 1 3"
30"
PABRe
(SEE NOTE 3 UNDER
I0/25/21 REVISION)
10'x 1 0' (±) PLUNGE POOL
•
OUTLET
PIPE
REFER TO GRADING
PLAN FOR TOP OF
DAM ELEVATION
s/<\\ \\�' \\•� \\ / 3 I.I.
5' WEIR LENGTH
REFER TO GRADING
PLAN FOR SPILLWAY
ELEVATION
I. \I. .I. \I. \I
:�AA�i:\irk\i��\i,\�i��\ '`
SPILLWAY BOTTOM AND
SLOPES TO BE STABILIZED
WITH PERMANENT EROSION
CONTROL MAT
.I.
< \/f\/;\'`
"A \ A\ A\ A
PERMANENT EROSION MAT TO BE
P-300 BY NORTH AMERICAN GREEN,
MIRAMAT BY MIFAFI CORP., OR
APPROVED EQUAL
SECTION SPILLWAY (NTS)
0 10 20
GRAPHIC SCALE
03/09/21 REVISION:
THE PURPOSE OF THIS REVISION 15 TO APPROVE THE GRADING AND RETAINING WALLS NECESSARY TO
PROVIDE 3: I INTERIOR SLOPES FOR THE SCM. THE 5CM DESIGN PARAMETERS SHALL BE CONFIRMED
BY THE CONTRACTOR FOR CERTIFICATION. ANY LANDSCAPING PLANTINGS IMPACTED BY GRADING
SHALL BE REPLACED.
09/08/21 REVISION:
I . BERM DOWNSLOPE STABILIZATION OPTION
2. THIS REVISION INCLUDES THE REMOVAL OF THE GEOTEXTILE FABRIC UNDER THE FOREBAY
RIP -RAP. NONE WAS INSTALLED IN THE ORIGINAL CONSTRUCTION AND IS EXPECTED TO PROVIDE
BC I I ER, INFILTRATION OF STORMWATER.
10/25/21 REVISION:
I . GEOTECHNOLOGIES, INC. COMPLETED A FIELD INVESTIGATION OF THE BERM FILL AND DO NOT
RECOMMEND ANY MODIFICATIONS AT THE CREST; HOWEVER, REMEDIAL WORK IS RECOMMENDED
ALONG THE BERM DOWNSLOPE FACE AS OUTLINED IN THEIR 10/2 1/2 I REPORT AND SHOWN
HEREON.
2. IT IS RECOMMENDED THAT GEOTECHNOLOGIES, INC. BE RETAINED TO OBSERVE THE REMEDIAL
WORK AND PROVIDE DIRECTION FOR NECESSARY REPAIRS.
3. FABRIC SHALL BE PLACED UNDER THE RIP -RAP FOR THE FOREBAY IF INSTALLED DIRECTLY ON
IN -SITU SOILS AND/OR. FILL. IF THE RIP -RAP I5 PLACED ON SOIL MEDIA, NO FABRIC I5 REQUIRED.
4. RETAINING WALLS SHALL BE SEGMENTED BLOCK TINTED MEDIUM OR DARK BROWN OR RUST IN
COLOR. ALL PERMITTING WILL BE HANDLED AS A SEPARATE SUBMTTAL.
5. FENCING SHALL BE INSTALLED AT THE TOP OF RETAINING WALLS IF REQUIRED BY THE BUILDING
CODE.
40
THE SIGNATURES AFFIXED BELOW CERTIFY THAT THIS SHEET HA5 BEEN REVIEWED AND APPROVED SOLELY
PER THE CERTIFICATIONS SIGNED ON THE COVER. SHEET OF THESE CONSTRUCTION PLANS.
N/A
rdalton 12/01/2021 11:18:15 AM
PW - TRANSPORTATION
N/A
sewens 11/30/2021 2:39:16 PM
BUILDING INSPECTIONS. / A
smiller 12/02/2021 2:01:35 PM
WR - UTILITY/A ENGINEERING
N
rsmith 11/30/2021 4:21:29 PM
ELECTRIC
N/A
1 4011noa0212:10:37 PM
WR-5.E
Approved
gem 1-1r30rz021 2:,0,0 PM
DATE - STORMWATFR
Approved
abunce 12/06/2021 12:21:39 PM
DATE PLANNING
DATE
N / A DATE
svanevery 12/01/2021 7:06:40 AM
DATE PLANNING - TRANSPORTATION DATE
N/A
khuege"ch 11/30/2021 11:49:21 AM
DATE FIRE
N/A
areincke 11/30/2021 2:05:32 PM
DATE
DATE PARKS, RECREATION 4 CULTURAL RES. DATE
C
tACD
(,)
0
N EERI NG, PLLC
V
Z
11'
C)
0
Construction Management
Civil Engineering
221 N. SALEM ST.
SUITE 001
PO BOX 1062
APEX, NC 27502
Office: 919-387-1174
Registration: P-0151
www.jonescnossen.com
‘,4:0J. .GINe .-
°e
R D.
CONSTRUCTION DRAWINGS
WAKE COUNTY, NORTFI CAROLINA
TOWN Of APEX
SCALE
NO -RETENTION
DRAWN
5MJ
REVISION
03/13/14
10/30/20
11/17/20
03/09/21
1st TRC COMMENTS
POND GRADING
GRADING REVISION
TRC COMMENTS
TRC COMMENTS
BERM DOVVNSLOPE
SHEET
9
PROJECT