20030570 Ver 7_Stormwater Info_20160108 (2)

E
BIORETENTION AREA 2 CROSS SECTION
3'x 3' PRECAST YARD INLET
w/CONCRETE LID w/MANHOLE ACCESS
6"H x 36"W WEIR OPENGINGS ON
3:1 SLOPE ALL x SIDES @ ELEVATION 298.00
TOP OF STRUCTURE ELEV = 299.00
SOD LAYER
ELEVATION = 297.00
12" PONDING
18" RCP OUTLET PIPE
INV = 294.75
(1.00% SLOPE)
3:1 SLOPE
24" RCP OUTLET PIPE
INV = 282.00
(O,xx% SLOPE)
10" SCHEDULE 40 PVC
HEADER UNDE�DRAIN
(0,50% MINIMUM SLOPE)
CAPPED CLEANOUT PIPE
EXTENDING 6" ABOVE MULCH/SOD
LAYER
- 4" WASHED SAND
NON -WOVEN FILTER FABRIC
10" #57 WASHED STONE
6" SCHEDULE 40 PVC PERFORARATED
UNDERDRAIN
(0.50% MINIMUM SLOPE)
ANTI FLOTATION BLOCK
INVERT OF STRUCTURE = 291.00
FILL FROM INVERT OF STRUCTURE
TO INVERT OF OUTLET PIPE
WITH CONCRETE
(CONCRETE TO SERVE AS BALLAST)
BIORETENTION AREA 1 CROSS SECTION
NOTES:
SOIL MEDIA DEPTH SHALL BE 2' FOR GRASSED (SODDED)
CELLS AND T FOR CELLS PLANTED WITH TREES AND
SHRUBS.
SOIL MEDIA REQUIREMEN fS:
85-88% SAND
8-12% FINES
3-5% ORGANICS
PERMEABILITY: 1-2 IN/HR
NOTES:
Tx T PRECAST YARD INLET
w/CONCRETE LID w/MANHOLE ACCESS
6"H 48"W WEIR OPENGINGS ON
ALL x SIDES @ ELEVATION 286.00
TOP OF STRUCTURE ELEV = 287.00
SOD LAYER
ELEVATION = 285.00
12" PONDING
10" SCHEDULE 40 PVC
HEADER UNDERDRAIN
(0.50% MINIMUM SLOPE)
CAPPED CLEANOUT PIPE
EXTENDING 6" ABOVE MULCH/SOD
LAYER
- 4" WASHED SAND
NON -WOVEN FILTER FABRIC
10" #57 WASHED STONE
6" SCHEDULE 40 PVC PERFORARATED
UNDERDRAIN
(0.50% MINIMUM SLOPE)
ANTI FLOTATION BLOCK
INVERT OF STRUCTURE = 279.00
FILL FROM INVERT OF STRUCTURE
TO INVERT OF OUTLET PIPE
WITH CONCRETE
(CONCRETE TO SERVE AS BALLAST)
1. ALL DRAINAGE AREAS TO A BIORETENTION FACILITY ARE TO BE STABILIZED PRIOR TO
INSTALLATION OF AMENDED SOILS, MULCH OR PLANTINGS.
2. AMENDED SOIL INSTALLATION WILL ONLY BE ALLOWED AND APPROVED WITH A VALID SOIL
ANALYSIS REPORT.
3. INSTALL WIRE SCREENING AROUND ALL OUTLET OPENINGS TO PREVENT LOSS OF MULCH.
4. UNDERDRAIN PIPE SHALL HAVE $' PERFORATIONS SPACED AT 6" CENTERS, MIN. 4 HOLES
PER ROW. MAX SPACING OF UNDERDRAIN PIPE IS 10 FEET ON CENTER.
5. UNDERDRAIN PIPES SHALL HAVE A MINIMUM OF 3 INCHES OF WASHED #57 STONE ABOVE
AND ON EACH SIDE OF THE PIPE.
6. ALL GRASSED BIORETENTION AREAS SHALL BE SODDED, NOT SEEDED. THE SOD MUST
NOT BE GROWN IN SOIL WITH AN IMPERMEABLE (CLAY) LAYER.
SAWCUT WEIR OPENING
INTO PRECAST
CONCRETE BOX
24" MINIMUM (SAWCUT
TO TOP OF BOX)
NOTE: ALL DIMENSIONS
ARE FROM THE INSIDE
OF THE BOX.
36"
,
I
,
I
6"
15.0" 1
ALL CONSTRUCTION TO BE IN ACCORDANCE WITH ALL TOWN OF WAKE FOREST, CITY OF RALEIGH AND / OR NCDOT STANDARDS AND SPECIFICATIONS��
I" (MIN)
\,,__24" INLET PIPE
INV=294.00
8" ORIFICE TO
LEVEL SPREADER
INV=292.75
INV. (BOX)=292.75
BYPASS STRUCTURE 1
NOT TO SCALE
36"
18" INLET PIPE —� \
INV=315.25
SAWCUT WEIR OPENING
INTO PRECAST
CONCRETE BOX
24" MINIMUM (SAWCUT
TO TOP OF BOX)
�7
IT 21"
6$s
15.0"
1" (MIN)
8" ORIFICE TO
LEVEL SPREADER
INV=314.00
INV. (BOX)=314.00
NOTE: ALL DIMENSIONS
ARE FROM THE INSIDE BYPASS STRUCTURE 2
OF THE BOX.
NOT TO SCALE
LEVEL SPREADER LIP
61 Y LAYER #67 STONE
INSTALL EARTHERN BERM w`�%uu Esc spyji•"'" RIPARIAN BUFFER
TO CREATE LEVEL �g�• f
SPREADER BLIND SWALE�
SIDE SLOPES 2:1 MAX STORMWATER INLET PIPE %3� �/��% , • "''^'}(
4'PERFORATED WC
CLASSARIP-RAP TzK;�sis%f 3FTWIDESTRIPOF
BIL NO CHANNEL l%�.*.'k.
UNDERDRAIN TO UNDERORAIN LINED FOREBAYB� .::�: NON -WOVEN GEOTEXTILE
DAYLIGHT FOROLASSARPRAP PERFORATED PVC FABRIC
UNDERDRAIN pq•
CONCRETE
FOOTER
.A ... ..L •may Y( •r•
• i " • ;- • CONCRETE LEVEL SECTION VIEW
xr/�..��a„�,xd;..;.,s%oa,'.,,7'�'v ;, u: 'e�',✓�s C'„r� SPREADER tIP
w T WIDE -3' THICK M57 STONE ON INLET PIPE
NON -WOVEN GEOTEXTILE FABRIC
0
3o TO LEVEL SPREADER
d
FT
PLAN VIEW 3
NON -WOVEN GEOTEXTILE
FABRIC
CLASS A RIP RAP
FOREBAY
NOT TO SCALE
LEVEL SPREADER
LEVEL SPREADER #
LENGTH
CONCRETE LIP ELEVATION
FOREBAY
SUFRACE AREA
1
76 FT
292.50
117 SF
2
66 FT
313.00
94 SF
BIORETENTION AREA CLEANOUT (TYPICAL)
4” MULCH
36" SOIL MEDIA
4" WASHED SAND
10" WASHED #57 STONE
WATERTIGHT SCREW ON TYPE
10,
DUT
NON WOVEN
FILTER FABRIC
SCHEDULE 40 PVC
LATERAL/HEADER
UNDERDRAIN PIPE
SOIL PREPARATION AND INSTALLATION
PLANTING SOIL SHALL CONSIST OF 85.88% SAND CONTENT (ASTM -C-144 RECOMMENDED) AND 3.5% ORGANIC MATERIAL (COMPOST, SANDY LOAM), 8-12%
FINES CONTENT, 10 TO 30 (12 TO 36 PPM ON A DRY BASIS) PHOSPHORUS INDEX (TOTAL PHOSPHORUS); 5.5 TO 7.0 PH LEVEL. A PERMEABILITY (K) FROM 1 TO 2
IN MR. PRIOR TO PLACEMENT OF THE PREPARED SOIL, A LABORATORY TEST MUST BE PERFORMED TO VERIFY THE TOTAL PHOSPHORUS AND PERCENT
CONTENT. CONTRACTOR TO COMPLETE SOIL VERIFICATION TESTS AND SUBMIT TO COUNTY INSPECTOR FOR APPROVAL PRIOR TO PLACEMENT OF THE SOIL.
SOIL SHOULD NOT BE INSTALLED UNTIL ALL THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED AND APPROVED BY THE INSPECTOR. PROVISION
FOR SEDIMENT CONTROL MUST BE INSTALLED AND MAINTAINED AS SPECIFIED IN THE SEDIMENT AND EROSION CONTROL PLANS. SOIL SHOULD NOT BE
DELIVERED TO THE SITE UNTIL EXCAVATION HAS TAKEN PLACE AND THE FABRIC AND UNDERDRAIN SYSTEM HAS BEEN INSTALLED. SCARIFICATION OF
IN-SITU SOIL SURFACES BY MANUALLY RAKING TO AERATE AND REDUCE SOIL COMPACTION IS RECOMMENDED.
INSTALLATION OF SOILS MUST BE DONE INA MANNER THAT WILL ENSURE ADEQUATE FILTRATION. AFTER THE INVERT AREA OF THE PROPOSED FACILITY
HAS BEEN SCARIFIED, SOIL SHOULD APPLIED IN LIFTS OF 12 INCHES. LIFTS MAY BE APPLIED USING A SMALL TRACK MACHINE SLOW GROUND PRESSURE
SUCH AS A MINI HOE. LIFTS MAY BE LIGHTLY WATERED TO ENCOURAGE NATURAL COMPACTION. SOIL MEDIA MUST MAINTAIN AN INFILTRATION RATE OF 1 TO
2 INIHR AFTER PLACEMENT.
AVOID OVER COMPACTION BY ALLOWING TIME FOR NATURAL COMPACTION AND SETTLEMENT, NO ADDITIONAL MANUAL COMPACTION OF SOIL IS
NECESSARY. ADDITIONAL SAND MAY BE NEEDED AFTER SETTLEMENT TO ACHIEVE FINAL GRADES, RAKE SOIL AS NEEDED TO LEVEL OUT.
CONTRACTOR TO COORDINATE DELIVERY OF MATERIALS TO AVOID STOCKPILING AND CONTAMINATION PROBLEMS. SOIL MATERIALS SHALL NOT BE
DELIVERED UNTIL BIORETENTION FACILITY HAS BEEN EXCAVATED OR GRADED TO THE DESIGN ELEVATIONS AND FILTER FABRIC AND UNDERDRAIN SYSTEMS
ARE IN PLACE.
CONTRACTOR TO INSTALL SILT FENCE AROUND ENTIRE PERIMETER OF THE BASIN UNTIL GROUND COVER IS FULLY ESTABLISHED. AN ALTERNATE WOULD BE
TO USE SOD OR STABILIZE THE SOIL AROUND THE PERIMETER OF THE BASIN.
PLANTING MATERIALS SHALL NOT BE DELIVERED UNTIL AFTER THE SOIL MEDIUM HAS HAD TIME TO SETTLE AND TRIMMED TO THE PROPER GRADE
ELEVATION.
SOIL PREPARATION AND INSTALLATION
THESE PLANS HAVE BEEN APPROVED FOR CONSTRUCTION BY THE TOWN
OF WAKE FOREST
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PROJECT NO: 2011076.00
DRAWN BY: TSG
DWG. CHECKED BY: MDA
SCALE: SEE PLAN
DATE: MARCH 25TH, 201 5
POND DETAILS
C-708