SW6191005_Plan (Misc. Detail)_20191107

1 2 3 4
FOR OFFICIAL USE ONLY
CONSTRUCTION SPECIFICATIONS
1. SUBGRADE PREPARATION - PREPARE THE SUBGRADE FOR RIPRAP AND FILTER FABRIC TO THE REQUIRED LINES AND GRADES SHOWN
ON THE PLANS. COMPACT ANY FILL REQUIRED IN THE SUBGRADE TO A DENSITY APPROXIMATING THAT OF THE SURROUNDING
G UNDISTURBED MATERIAL OR OVERFILL DEPRESSIONS WITH RIPRAP. REMOVE BRUSH, TREES, STUMPS, AND OTHER OBJECTIONABLE
MATERIAL. CUT THE SUBGRADE SUFFICIENTLY DEEP THAT THE FINISHED GRADE OF THE RIPRAP WILL BE AT THE ELEVATION OF THE
SURROUNDING AREA. CHANNELS SHOULD BE EXCAVATED SUFFICIENTLY TO ALLOW PLACEMENT OF THE RIPRAP IN A MANNER SUCH
THAT THE FINISHED INSIDE DIMENSIONS AND GRADE OF THE RIPRAP MEET DESIGN SPECIFICATIONS.
2. SYNTHETIC FILTER FABRIC - PLACE THE CLOTH FILTER DIRECTLY ON THE PREPARED FOUNDATION. OVERLAP THE EDGES BY AT
LEAST 12 INCHES, AND SPACE ANCHOR PINS EVERY 3 FT ALONG THE OVERLAP. BURY THE UPSTREAM END OF THE CLOTH A MINIMUM
OF 12 INCHES BELOW GROUND AND WHERE NECESSARY, BURY THE LOWER END OF THE CLOTH OR OVER LAP WITH THE NEXT
SECTION AS REQUIRED. TAKE CARE NOT TO DAMAGE THE CLOTH WHEN PLACING RIPRAP. IF DAMAGE OCCURS REMOVE THE RIPRAP,
AND REPAIR THE SHEET BY ADDING ANOTHER LAYER OF FILTER MATERIAL WITH A MINIMUM OVERLAP OF 12 INCHES AROUND THE
DAMAGED AREA. IF EXTENSIVE DAMAGE IS SUSPECTED, REMOVE AND REPLACE THE ENTIRE SHEET.
WHERE LARGE STONES ARE USED OR MACHINE PLACEMENT IS DIFFICULT, A 4-INCH LAYER OF FINE GRAVEL OR SAND MAY BE NEEDED
TO PROTECT THE FILTER CLOTH.
F
3. STONE PLACEMENT - PLACEMENT OF RIPRAP SHOULD FOLLOW IMMEDIATELY AFTER PLACEMENT OF THE FILTER FABRIC. PLACE
RIPRAP SO THAT IT FORMS A DENSE, WELL -GRADED MASS OF STONE WITH A MINIMUM OF VOIDS. THE DESIRED DISTRIBUTION OF
STONES THROUGHOUT THE MASS MAY BE OBTAINED BY SELECTIVE LOADING AT THE QUARRY, AND CONTROLLED DUMPING DURING
FINAL PLACEMENT. PLACE RIPRAP TO ITS FULL THICKNESS IN ONE OPERATION. DO NOT PLACE RIPRAP BY DUMPING THROUGH
CHUTES OR OTHER METHODS THAT CAUSE SEGREGATION OF STONE SIZES. TAKE CARE NOT TO DISLODGE THE UNDERLYING BASE
OR FILTER FABRIC WHEN PLACING THE STONES.
THE TOE OF THE RIPRAP SLOPE SHOULD BE KEYED TO A STABLE FOUNDATION AT ITS BASE. THE TOE SHOULD EXTEND
HORIZONTALLY FROM THE SLOPE.
PROVIDE CUTOFF WALLS AT BOTH THE BEGINNING AND END OF THE RIPRAP CHANNELS TO PROTECT AGAINST UNDERCUTTING. THE
CUTOFF WALLS SHALL CONSIST OF THE SAME CLASS OF RIPRAP AS THE CHANNEL AND SHALL BE A DEPTH OF 2.0 TIMES THE DESIGN
THICKNESS OF THE RIPRAP, AND SHALL EXTEND HORIZONTALLY FOR A LENGTH OF 1.0 TIMES THE DESIGN THICKNESS.
E THE FINISHED SLOPE SHOULD BE FREE OF POCKETS OF SMALL STONE OR CLUSTERS OF LARGE STONES. HAND PLACING MAY BE
NECESSARY TO ACHIEVE THE PROPER DISTRIBUTION OF STONE SIZES TO PRODUCE A RELATIVELY SMOOTH, UNIFORM SURFACE. THE
FINISHED GRADE OF THE RIPRAP SHOULD BLEND WITH THE SURROUNDING AREA. NO OVERFALL OR PROTRUSION OF RIPRAP SHOULD
BE APPARENT.
FBI
C
5
R
DITCH AND BURY FILTER FABRIC (ALL
4 SIDES) (MIN. 12" DEEP AND EXTEND
MIN. 12" FROM TOP EDGE OF RIPRAP)
RIP -RAP
7
THICKNESS (d)
FILTER EE
O�
FABRIC
COMPACTED d
SUBGRADE —
RIP -RAP ALONG SLOPE AREAS
EXISTING GROUND OR PROPOSED GRADE
W _
12" TYP
MAINTENANCE
INSPECT CHANNELS AND OTHER AREAS WHERE CONCENTRATED FLOW OCCURS AT REGULAR INTERVALS AS WELL AS AFTER MAJOR
BOTTOM
WIDTH
SIDE
SLOPE
DEPTI
d MIN.
—DITCH AND BURY FILTER FABRIC
(ALL 4 SIDES) (MIN. 12" DEEP
AND EXTEND MIN. 12" FROM TOP
EDGE OF RIPRAP)
12" TYP
III COMPACTED SUBGRADE
FILTER FABRIC
RIP -RAP
RAINS, AND MAKE REPAIRS PROMPTLY. GIVE SPECIAL ATTENTION TO THE OUTLET AND INLET SECTIONS AND OTHER POINTS WHERE THICKNESS (d)
CONCENTRATED FLOW ENTERS. CAREFULLY CHECK STABILITY AT ROAD CROSSINGS, AND LOOK FOR INDICATIONS OF PIPING, SCOUR RIP -RAP CROSS SECTION FOR SLOPE AREAS
HOLES, OR BANK FAILURES. MAKE REPAIRS IMMEDIATELY. MAINTAIN ALL VEGETATION ADJACENT TO THE RIPRAP IN A HEALTHY, MAXIMUM
VIGOROUS CONDITION TO PROTECT THE AREA FROM EROSION AND SCOUR DURING OUT -OF -BANK FLOW AND OR LARGER STORM STRUCTURE La W d50 STONE DIA. d
EVENTS.
D#1/TD#1 OUTLET INFILT.
BASIN
15'
10'
8"
D#2/TD#2 OUTLET INFILT.
BASIN
8'
10'
8"
OTHER RIPRAP AREAS SHOULD BE INSPECTED PERIODICALLY FOR SCOUR OR DISLODGED STONES. CONTROL OF WEED AND BRUSH D#3/TD#3 OUTLET INFILT.
BASIN
8
10
8
GROWTH MAY BE NEEDED IN SOME LOCATIONS. IMMEDIATELY MAKE ALL NEEDED REPAIRS TO PREVENT FURTHER DAMAGE. D#4/TD#4 OUTLET INFILT.
BASIN
22'
10'
8"
1 RIPRAP DETAIL
CG102
C-503 NOT TO SCALE
CG 104
NCDOT #5 OR #57
WASHED STONE
NATURAL GROUND
RIP RAP HEADWALL,
V MIN. HEIGHT FROM
ROAD SHOULDER
1' 3'
CLASS B RIP RAP
CONSTRUCTION SPECIFICATIONS
B
1. CLEAR THE AREA OF ALL DEBRIS THAT MIGHT HINDER EXCAVATION AND
DISPOSAL OF SPOIL..
2. INSTALL THE CLASS B OR CLASS 1 RIP RAP IN A SEMI -CIRCLE AROUND
THE PIPE INLET. THE STONE SHOULD BE BUILT UP HIGHER ON EACH END
WHERE IT TIES INTO THE EMBANKMENT. THE MINIMUM CREST WIDTH OF
THE RIP RAP SHOULD BE 3 FEET, WITH A MINIMUM BOTTOM WIDTH OF 11
FEET. THE MINIMUM HEIGHT SHOULD BE 2 FEET, BUT ALSO 1 FOOT
LOWER THAN THE SHOULDER OF THE EMBANKMENT OR DIVERSIONS.
3. A 1 FOOT THICK LAYER OF NCDOT #5 OR #57 STONE SHOULD BE PLACED
ON THE OUTSIDE SLOPE OF THE RIP RAP.
4. THE SEDIMENT STORAGE AREA SHOULD BE EXCAVATED AROUND THE
OUTSIDE OF THE STONE HORSESHOE 18 INCHES BELOW NATURAL
GRADE.
5. WHEN THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED, FILL
A
DEPRESSION AND ESTABLISH FINAL GRADING ELEVATIONS, COMPACT
AREA PROPERLY, AND STABILIZE WITH GROUND COVER.
64O�
FLOW _
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O�
MAINTENANCE
CLASS B
RIP RAP
PIPE INVERT, 36"
PIPE MAX.
NATURAL
GROUND
Z BERM NCDOT #5 OR
ASHED STONE
INSPECT ROCK PIPE INLET PROTECTION AT LEAST WEEKLY AND AFTER
EACH SIGNIFICANT (1/2 INCH OR GREATER) RAINFALL EVENT AND
REPAIR IMMEDIATELY. REMOVE SEDIMENT AND RESTORE THE
SEDIMENT STORAGE AREA TO ITS ORIGINAL DIMENSIONS WHEN THE
SEDIMENT HAS ACCUMULATED TO ONE- HALF THE DESIGN OF THE
TRAP. PLACE THE SEDIMENT THAT IS REMOVED IN THE DESIGNATED
DISPOSAL AREA AND REPLACE THE CONTAMINATED PART OF THE
GRAVEL FACING.
CHECK THE STRUCTURE FOR DAMAGE. ANY RIP RAP DISPLACED FROM
THE STONE HORSESHOE MUST BE REPLACED IMMEDIATELY.
AFTER ALL THE SEDIMENT- PRODUCING AREAS HAVE BEEN
PERMANENTLY STABILIZED, REMOVE THE STRUCTURE AND ALL THE
UNSTABLE SEDIMENT. SMOOTH THE ARE TO BLEND WITH ADJOINING
AREAS AND PROVIDE PERMANENT GROUND COVER.
ROCK PIPE INLET PROTECTION DETAIL
CG1021 C-503 NOT TO SCALE
2.0 d
MIN.
CHANNEL BOTTOM SIDE
TYPE DEPTH WIDTH SLOPES
8 1 9
A
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FILTER BLANKET
NOTE:
EXTEND THE APRON UP THE CHANNEL BANKS TO A MINIMUM HEIGHT OF 1 FOOT.
OUTLET PROTECTION
La
W
d
d50
RIPRAP CLASS
ES-3/ES-5
10,
12.5'
1.5'
8-INCH
CLASS B
ES-8 & ES-14
6'
7'
1.5'
8-INCH
CLASS B
FES-11
10'
11.25'
1.5'
8-INCH
CLASS B
CONSTRUCTION SPECIFICATIONS
12" 18" CLASS B RIPRAP 0.5' 2' 3:1 MAX
1. ENSURE THAT THE SUBGRADE FOR THE FILTER AND RIP RAP FOLLOWS THE
12" 18" CLASS B RIPRAP 0.5' 2' 3.1 MAX
REQUIRED LINES AND GRADES SHOWN IN THE PLAN. COMPACT ANY FILL
12" 18" CLASS B RIPRAP 0.5' 2' 3:1 MAX
REQUIRED IN THE SUBGRADE TO THE DENSITY OF THE SURROUNDING
12" 18" CLASS B RIPRAP 0.5' 2' 3:1 MAX
UNDISTURBED MATERIAL. LOW AREAS IN THE SUBGRADE ON UNDISTURBED
SOIL MAY ALSO BE FILLED BY INCREASING THE RIP RAP THICKNESS.
2. THE RIP RAP AND GRAVEL FILTER MUST CONFORM TO THE SPECIFIED GRADING
LIMITS SHOWN ON THE PLANS.
3. FILTER CLOTH, WHEN USED, MUST MEET DESIGN REQUIREMENTS AND BE
PROPERLY PROTECTED FROM PUNCHING OR TEARING DURING INSTALLATION.
REPAIR AND DAMAGE BY REMOVING THE RIP RAP AND PLACING ANOTHER PIECE
OF FILTER CLOTH OVER THE DAMAGED AREA. ALL CONNECTING JOINTS
SHOULD OVERLAP SO THE TOP LAYER IS ABOVE THE DOWNSTREAM LAYER A
MINIMUM OF 1 FOOT. IF THE DAMAGE IS EXTENSIVE, REPLACE THE ENTIRE
FILTER CLOTH.
4. RIP RAP MAY BE PLACED BY EQUIPMENT, BUT TAKE CARE TO AVOID DAMAGING
THE FILTER.
5. THE MINIMUM THICKNESS OF THE RIP RAP SHOULD BE 1.5 TIMES THE MAXIMUM
STONE DIAMETER.
6. RIP RAP MAY BE FIELD STONE OR ROUGH QUARRY STONE. IT SHOULD BE HARD,
ANGULAR, HIGHLY WEATHER- RESISTANT AND WELL GRADED GRANITE.
7. CONSTRUCT THE APRON ON ZERO GRADE WITH NO OVERFILL AT THE END.
MAKE THE TOP OF THE RIP RAP AT THE DOWNSTREAM END LEVEL WITH THE
RECEIVING AREA OR SLIGHTLY BELOW IT.
8. ENSURE THAT THE APRON IS PROPERLY ALIGNED WITH THE RECEIVING STREAM
AND PREFERABLY STRAIGHT THROUGHOUT ITS LENGTH. IF A CURVE IS NEEDED
TO FIT THE SITE CONDITIONS, PLACE IT IN THE UPPER SECTION OF THE APRON.
9. IMMEDIATELY AFTER CONSTRUCTION, STABILIZE ALL DISTURBED AREAS WITH
VEGETATION.
MAINTENANCE
INSPECT RIP RAP OUTLET STRUCTURES WEEKLY AND AFTER SIGNIFICANT (1/2 INCH
OR GREATER) RAINFALL EVENTS TO SEE IF ANY EROSION AROUND OR BELOW THE
RIP RAP HAS TAKEN PLACE, OR IF STONES HAVE BEEN DISLODGED. IMMEDIATELY
MAKE ALL NEEDED REPAIRS TO PREVENT FURTHER DAMAGE.
LL RIP -RAP OUTLET PROTECTION
CG1031C-503 NOT TO SCALE
CG 104
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10 MIL
2.0' 1.0' 2.0' 2.0'
�.-/i. rL-f,%.; IC LINER
#57 STONE
SECTION 'A'
CONCRETE I I I *BLACK LETTERS
WASHOUT 6" HIGH
48 x24 PLYWOOD
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OONCRETE WASHOUT'
SIGN DETAIL
NOTES:
`L10 MIL PLASTIC 1. ACTUAL LAYOUT TO BE DETERMINED IN FIELD.
ANCHOR PLASTIC LINER LINING 2. THE 'CONCRETE WASHOUT' SIGN SHALL BE INSTALLED WITHIN
#57 STONE 30 FT OF THE TEMPORARY CONCRETE WASHOUT FACILITY.
PLAN 3. PIT CAPACITY IS MINIMUM OF 6 CU FT PER 10 CU YD OF CONCRETE.
4. CONTRACTOR IS RESPONSIBLE FOR PROPER REMOVAL AND
DISPOSAL OF CONCRETE.
1 CONCRETE TRUCK WASHOUT DETAIL
CG1021 C-506 NOT TO SCALE
SLR=2' FACE OF CURB
EDGE OF PAVEMENT
CURB
10 10
6" 1 1
o.
4"
FLUME SECTION A -A
NOT TO SCALE
TYPICAL CONCRETE FLUME DETAIL
1 IC-506 NOT TO SCALE
NOTES:
1. CONSTRUCT THE SUBGRADE TO THE ELEVATIONS SHOWN ON THE PLANS.
REMOVE ALL UNSUITABLE MATERIAL AND REPLACE THEM WITH STABLE MATERIALS.
COMPACT THE SUBGRADE THOROUGHLY AND SHAPE IT TO A SMOOTH, UNIFORM
SURFACE. KEEP THE SUBGRADE MOIST AT THE TIME CONCRETE IS POURED. ON FILL
SLOPES, ENSURE THAT THE SOIL ADJACENT TO THE CHUTE FOR AT LEAST 3 FEET IS
WELL -COMPACTED.
2. PLACE CONCRETE FOR THE FLUME TO THE THICKNESS SHOWN ON THE PLANS.
3. FORM, REINFORCE, AND POUR TOGETHER CUTOFF WALLS, ANCHOR LUGS, AND
CHANNEL LININGS.
4. TAKE ADEQUATE PRECAUTIONS TO PROTECT FRESHLY POURED CONCRETE FROM
EXTREME TEMPERATURES TO ENSURE PROPER CURING.
5. PROVIDE TRANSVERSE (CONTRACTION) JOINTS TO CONTROL CRACKING AT
APPROXIMATELY 20-FEET INTERVALS. JOINTS MAY BE FORMED BY USING A 1/8-INCH
THICK REMOVABLE TEMPLATE OR BY SAWING TO A DEPTH OF AT LEAST 1 INCH.
6. IN VERY LONG FLUMES, INSTALL EXPANSION JOINTS AT INTERVALS NOT TO
EXCEED 50 FEET.
7. PLACE FILTERS AND FOUNDATION DRAINS, WHEN REQUIRED, IN THE MANNER
SPECIFIED, AND PROTECT THEM FROM CONTAMINATION WHEN POURING THE
CONCRETE FLUME.
8. PROPERLY STABILIZE ALL DISTURBED AREAS IMMEDIATELY AFTER CONSTRUCTION.
MAINTENANCE:
INSPECT FLUMES AFTER EACH RAINFALL UNTIL ALL AREAS ADJOINING THE FLUME
ARE PERMANENTLY STABILIZED. REPAIR ALL DAMAGE NOTED IN INSPECTIONS
IMMEDIATELY. AFTER THE SLOPES ARE STABILIZED, FLUMES NEED ONLY PERIODIC
INSPECTION, AND INSPECTION AFTER MAJOR STORM EVENTS.
3 MAX
1
MAINTENANCE:
D
;^
O
D
r
D
FEATHERING CURB DETAIL
CS401 IC-506 NOT TO SCALE
TOP OF CURB
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
6" 1 ' -6"
2' -0"
6" HIGH NORMAL GUTTER (2411)
6"
TOP OF CURB
D
0
D
0
-1 D Z
�.. ._�..
2'-0"
6" HIGH PITCHED GUTTER (2411)
NOTES:
1. CURB AND GUTTER TO BE CONSTRUCTED IN 10 FOOT LENGTHS, EXCEPT AS OTHERWISE NOTED.
2. 1/2" EXPANSION JOINTS SHALL BE PROVIDED AT INTERVALS NOT TO EXCEED 50 FEET, AT THE ENDS AND MID -POINT OF
RETURNS, AND AT ANY POINT WHERE THE NEW CURB AND GUTTER ABUTS OTHER CONCRETE STRUCTURES.
3. 5' LONG TRANSITIONS SHALL BE PROVIDED BETWEEN NORMAL GUTTER AND PITCHED GUTTER, UNLESS OTHERWISE NOTED
ON THE SITE PLAN.
3 CURB & GUTTER
CS401 C-506 NOT TO SCALE
VARIES
SOD
3 MAX
1 I /,-
MAINTENANCE OF GRASSED SWALES INVOLVE GROOMING THE VEGETATION AND
OCCASIONALLY REMOVING TRASH. IF NATIVE VEGETATION IS USED INSTEAD OF
TURF, VEGETATION HAS TO BE MOWED TO RELOAD THE GROWTH OF WOODY
VEGETATION. ROUTINE MOWING IS REQUIRED IF TURF GRASSES ARE USED. GRASS
SHALL BE CUT NO LOWER THAN 5 INCHES. SEDIMENT SHALL BE REMOVED WHEN IT
REACHES A DEPTH OF 4" OR WHEN IT COVERS THE GRASS.
THE DRAINAGE AREA OF THE GRASSED SWALE SHALL BE CAREFULLY MANAGED TO
REDUCE THE SEDIMENT LOAD TO THE GRASSED SWALE. THE GRASSED SWALE WILL
BE INSPECTED ONCE A QUARTER. AFTER THE FIRST-TIME FERTILIZATION TO
ESTABLISH THE GRASS IN THE SWALE, FERTILIZER WILL NOT BE APPLIED TO THE
GRASSED SWALE.
5 TYPICAL GRASS SWALE
506 NOT TO SCALE
CG1
2�Lc_
CONSTRUCTION SPECIFICATIONS:
TO MAXIMIZE THE INFILTRATION CAPACITY OF THE SWALE,
COMPACTION OF THE SOIL UNDERLAYING THE SWALE SHALL BE
AVOIDED.
THE SWALE IS PARTICULARLY VULNERABLE TO SCOUR AND EROSION
BEFORE BEING TEMPORARILY/PERMANENTLY STABILIZED. THEREFORE,
AS SOON AS PRACTICLE AFTER GRADING THE SWALE, STABILIZE THE
SWALE WITH TEMPORARY SEEDING AND LINING MATERIAL.
IN ORDER TO ALLEVIATE THE DRAINAGE AND PONDING STORMWATER
ISSUES, SWALES SHALL BE CONSTRUCTED AND VEGETATED WITH
TEMPORARY SEEDING EARLY IN THE CONSTRUCTION SCHEDULE. IT IS
PREFERRED TO UTILIZE TEMPORARY SEEDING DURING ONGOING
CONSTRUCTION AND LAND DISTURBANCE ACTIVITIES. THIS WILL
PREVENT THE SOD FROM BEING DAMAGED AND NEEDING TO BE
REPLACED.
TEMPORARY EROSION - RESISTANT CHANNEL LININGS SHALL BE USED
TO STABILIZE THE SWALE UNTIL THE TEMPORARY VEGETATION
BECOMES ESTABLISHED.
INSTALL SOD MATERIAL IN GRASS SWALE AT THE END OF
CONSTRUCTION WHEN OTHER PROJECT AREAS ARE SODDED.
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