SW6191004_C-504_1/22/2020

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GENERAL NOTES:
1. USE 4000 PSI MINIMUM COMPRESSIVE STRENGTH CONCRETE.
2. FABRICATE, ASSEMBLE AND DESIGN PRECAST MANHOLE COMPONENTS
G ACCORDANCE WITH AASHTO M199.
3. ASSEMBLE RISER AND GRADE RINGS WITH THE STEPS SPACED 12" FROM THE
TOP TO THE BOTTOM OF THE MANHOLE.
4. WHERE THE MANHOLE IS EXPOSED TO ROAD TRAFFIC, CONSTRUCT THE TOP OF
THE MANHOLE FLUSH WITH THE GROUND AND A MINIMUM OF 9" ABOVE THE
GROUND AT OTHER LOCATIONS.
5. LIMIT DEPTH OF FILL TO 30'-0" FROM FINISH GRADE TO TOP OF BOTTOM SLAB.
6. THE MIN. SLAB THICKNESS 'T' IS THE DIMENSION OF THE THINNEST PROTION OF
THE TOP/BOTTOM SLAB.
* TOP MAT OF REINFORCEMENT MAY BE NEGLECTED IF TOP SLAB HAS A
DISTINGUISHABLE TOP AND BOTTOM.
'D' + 2 'W
F ADDITIONAL
1" MIN. #4 REBAR
CLR.
j 1" MIN.
USE MIN. AREA OF STEEL IN CLR.
TOP SLAB OF #4's @ 8" CTS.
EACHWAY/EACH FACE.*
FLAT TOP SLAB
ADDITIONAL #4 EACH SIDE OF
E OPENING (1" CLEAR OF BOTTOM
FACE PLACE BARS DIAGONAL TO
CORNERS (TYP.)
Fel
C
n
ADDITIONAL #4 EACH SIDE OF
OPENING (1" CLEAR OF BOTTOM
FACE)
GRATED INLET OPTION
FRAME AND
G RAT E
C
MANHOLE OPTION
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ALTERNATE CONE SECTION
SEE STD. 840.54
FOR MANHOLE
RING AND
COVER
D
W
T
As
INTERNAL
MIN. WALL
MIN. TOP/BOTTOM
MIN. CIRCUMFERENTIAL AREA
DIAMETER
THICKNESS
SLAB THICKNESS
OF STEEL PER VERTICAL FT.
(FT.)
(IN.)
(IN.)
(SQ. IN.)
5
5
8
0.15
GRADE
RING
ECCENTRIC CONE
LOCATE WALL
REINFORCEMENT
IN MIDDLE THIRD
OF WALL
RISER
r�
PRECAST MANHOLE 5' DIAMETER 12" THRU 48" PIPE
CG101 C-504 NOT TO SCALE
CU101
NCDOT WASHED #4 STONE
(COMPACTED IN PLACE AND PROOF -ROLLED PER SPECIFICATIONS)
Z o 0 0 o SOo
�Oo° �Oo° �Oo° SOo°
°o0°°O�ooO°�OooO°OOoaO°OOoaO°a GEOTEXTILE FABRIC PER SPECIFICATIONS
O O O O
W
ui COMPACTED SUBGRADE,
MINIMUM 95% MODIFIED
PROCTOR MAXIMUM DRY
DENSITY
GRAVEL ROAD DETAIL
CS101 C-504 NOT TO SCALE
2'-0"
MIN. AREA OF
STEEL IS 0.07 IN
6" MAX. SPACING
OF CIRCUM. R/F
STEP STD. NO. 840.66
N
T As
(CIRCUMFERENTIE
REINFORCEMENT)
LONGITUDINAL
REINFORCEMENT
'D' vW
\ USE MIN. AREA OF STEEL IN
BASE SLAB OF 0.12 IN2 PER
LINEAR FOOT EACH WAY
TYPICAL MANHOLE SECTION
BLACK LETTERS 4"
HEIGHT
SIGN DETAIL
PLYWOOD
36"x18" PAINTED
WHITE
4"x4" TREATED
WOOD POSTS
BASE
NOTES:
1. LOCATE WASH -OUT AREA IN LOCATIONS SHOWN ON
CG101 AND AT LEAST 50' FROM OPEN WATERS AND
DRAINAGE INLETS.
2. LINE WASH OUT PIT WITH LINER OF 8-MIL LAMINATED
PLASTIC GEOTEXTILE FABRIC (DURA-SKRIM 8BW OR
APPROVED EQUAL).
3. PROPERLY DISPOSE OF DRIED CONCRETE AND
RESTORE AREA TO FINAL GRADES AND SURFACES AT
COMPLETION OF CONSTRUCTION.
MAINTENANCE NOTES:
1. INSPECT AREA REGULARLY AND MAKE REPAIRS
PROMPTLY.
2. ENSURE CONCRETE IS BEING CAPTURED AND LINER
REMAINS ANCHORED.
3. REMOVE DRIED CONCRETE AND RESTORE PIT BEFORE
CAPACITY IS EXCEEDED.
4. REPLACE OR PATCH IMPERVIOUS LINER THAT BECOMES
DAMAGED. RE -ANCHOR LINER AS NEEDED.
4" MIN. CLEAN SAND
UNLESS THE NATIVE
SOIL IS EQUIVALENT
(1-2% FINES OR LESS).
BASIN BOTTOM WQV
(MAX)1 ELEV.=223.77
3
1' MIN. UNDISTURBED IN -SITU
2' MIN. SOIL (K=0.52"/HR. MIN.)
NOTE: REFER TO GRADING PLAN FOR THE
GRADING INFORMATION.
SHWT = SEASONAL HIGH WATER TABLE
MAINTENANCE:
OVERFLOW
BERM
ELEV.=224.67 FT
(MAX)1 L
3
SHWT
THE DRAINAGE AREA SHALL BE CAREFULLY MANAGED TO REDUCE THE
SEDIMENT LOAD TO THE INFILTRATION BASIN.
IMMEDIATELY AFTER THE INFILTRATION BASIN IS ESTABLISHED, THE
VEGETATION SHALL BE WATERED TWICE WEEKLY IF NEEDED UNTIL THE PLANTS
BECOME ESTABLISHED (COMMONLY SIX WEEKS).
NO PORTION OF THE INFILTRATION BASIN IS TO BE FERTILIZED AFTER THE
INITIAL FERTILIZATION THAT IS REQUIRED TO ESTABLISH THE VEGETATION.
THE VEGETATION IN AND AROUND THE BASIN SHALL BE MAINTAINED AT A
HEIGHT OF APPROXIMATELY SIX INCHES.
AFTER THE INFILTRATION BASIN IS ESTABLISHED, IT SHALL BE INSPECTED ONCE
A QUARTER AND WITHIN 24 HOURS AFTER EVERY STORM EVENT GREATER
THAN 1.0 INCHES (OR 1.5 INCHES IF IN A COASTAL COUNTY). RECORDS OF
INSPECTION AND MAINTENANCE SHALL BE KEPT IN A KNOWN SET LOCATION
AND SHALL BE AVAILABLE UPON REQUEST.
STORMWATER MANAGEMENT INFILTRATION BASIN
CG 101 IC-504 NOT TO SCALE
ANCHOR PLASTIC
LINING WITH #57 STONE
BERM (24" WIDE x 12"
TALL)
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PLASTIC~- I 24
LINING 7
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10' MIN.
6' MIN.
CONCRETE WASHOUT AREA
CG101 IC-504 NOT TO SCALE
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ISSUED FOR CONSTRUCTION