SW3220302_Plansheet - Misc. Detail_20220308

SKIMMER SEDIMENT BASIN
DESIGN CRITERIA
DRAINAGE
AREA
< 10 AC.
(ACRES)
MIN.
LENGTH TO
2:1
WIDTH RATIO
MAX.
LENGTH TO
6:1
WIDTH RATIO
MIN.
1800
VOLUME
(CU. FT.
REQUIRED
PER AC.
DISTURBED)
325
SURFACE
(SO. FT,
AREA
PER CFS
REQUIRED
q10)
DATA BLOCK
PLAN VIEW
INFLOW
AVERAGE = AREA*
WIDTH LENGTH
* AREA OF BASIN WATER
SURFACE AT TOP OF PRIMARY
SPILLWAY
CROSS-SECTION VIEW
INFLOW BAFFLES
DEWATERING
ZONE
FILTER FABRIC CLEANOUT
DEPTH SEDIMENT
(H/2) STORAGE -
NOTES:
1. REFER TO NCESCPDM
SECTION #6.64 FOR
ADDITIONAL DESIGN
EMBANKMENT SPECIFICATIONS
LENGTH
REGARDING SKIMMER
SEDIMENT BASINS.
2. REFER TO STD. 30.19
10'
FOR BAFFLE SPACING
MIN.
AND INSTALLATION
3. TURBIDITY CURTAIN
(CLDS #30.23) MAY BE
USED IN LIEU OF
POROUS BAFFLES (CLDS
SKIMMER
#30.19).
DEWATERING
DEVICE
4. SKIMMER INVERT
EMERGENCY ELEVATION = BASIN
SPILLWAY BOTTOM FE 1' MIN.
L
5. H = SPILLWAY
ELEVATION - SKIMMER
INVERT ELEVATION
BAFFLES
(CLDS #30.19) 1' FREEBOARD W=5MIN.
EMBANKMENT
6" MAX. DEPTH OF FLOW
OVER EMERGENCY SPILLWAY
T-1.5' MIN.
H=2' MI�
E
EMERGENCY
SPILLWAY
SKIMM
LENGTH =
SPECIFY
H x 1.5
SEEPAGE
(MIN. 5')
CONTROL NOT TO SCALE
MEASURES
BASIN
DRAINAGE
AREA
(ACRES)
DENUDED
AREA
(ACRES)
Qm
BASIN
VOLUME
BASIN SURFACE
AREA
CLEANOUT
DEPTH (FT.)
H/2
H
(FEET)
Z
(FEET)
L
(FEET)
T
(FEET)
W
(FEET)
SKIMMER
PIPE
DIAMETER
SKIMMER
ORIFICE
DIAMETER
REQUIRED
(CUBIC FT.)
PROVIDED
(CUBIC FT.)
REQUIRED
(SO FT.)
PROVIDED
(SO FT.)
1
2.34
2.03
6.6
3,654
5,679
2,157
3,538
1.25
3.5
5
10
1.5
10
2
1.4
STEEL POST
WIRE FENCING
(IF APPLICABLE)
WOVEN FILTER FABRIC
I �I
I I,
SKIMMER SEDIMENT BASIN
4' MAX.
WASHED STONE HARDWARE CLOTH
(NCDOT 05 OR #57) BETWEEN POSTS
AND COVERED BY
STONE
---------------
I I1 I I1 I I
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IIIIII=III II IIIIII=III IIIIIIIII=III III1
III1 I I1 I I III
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=1 11-1 I
ARM ASSEMBLY
"C" ENCLOSURE
WATER ENTRY UNIT
PERSPECTIVE VIEW
PVC VENT
PVC ELBOW PIPE
PVC END CAP
WATER SURFACE
-
PVC END CAP
PVC PIPE 15
1/2" HOLES IN N
PVC TEE
UNDERSIDE '< 51
I�• PVC TEE
FLEXIBLE
HOSE SCHEDULE 40
Cl PVC PIPE
END VIEW FRONT VIEW
SCHEDULE 40
PVC PIPE
ORIFICE
PLATE
SCHEMATIC OF SKIMMER TAKEN FROM PENNSYLVANIA EROSION AND SEDIMENT POLLUTION CONTROL MANUAL, MARCH 2O00.
"H" REFERS TO THE HEIGHT FROM INVERT OF FLEXIBLE HOSE ON SKIMMER TO THE INVERT OF THE PRIMARY SPILLWAY.
NOT TO SCALE
STD. N0. REV. SKIMMER STD. N0. REV.
30.02A 18 30.02BI 12,
STEEL POST
9, HARDWARE CLOTH
�,179�Qj WASHED STONE
(NCDOT #5 OR #57)
FLOW
-m-'W -I II ICI ..
4.
ANCHOR SKIRT;
EXCAVATE TRENCH
AND COMPACT
BACKFILL
GENERAL NOTES: MAINTENANCE NOTES:
1. SEDIMENT FILTER OUTLET AND HARDWARE CLOTH SHALL BE 16 INCHES HIGH BUT NO 1. FILTER OUTLETS SHALL BE INSPECTED BY THE FINANCIALLY RESPONSIBLE PARTY OR
TALLER THAN 18 INCHES. HIS AGENT IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING
PROLONGED RAINFALL. ANY REPAIRS NEEDED SHALL BE MADE IMMEDIATELY.
2. HARDWARE CLOTH SHALL BE ANCHORED TO THE STEEL POSTS SECURELY USING
APPROPRIATE ANCHORS. HARDWARE CLOTH SHALL BE KEYED IN A MINIMUM OF 12 INCHES 2. THE STONE SHALL BE REPLACED PROMPTLY AFTER ANY EVENT THAT HAS CLOGGED
IN LENGTH AND BACKFILLED PROPERLY AS SHOWN IN ABOVE DETAIL. HARDWARE CLOTH TO OR REMOVED IT.
BE SAME AS STD. #30.09 (19 GAUGE, 1/4" SPACING).
3. SEDIMENT DEPOSITS SHOULD BE REMOVED WHEN DEPOSITS REACH HALF THE HEIGHT
3. POSTS SHALL BE NO MORE THAN 4 FEET APART. OF THE BARRIER. ANY SEDIMENT DEPOSITS REMAINING IN PLACE AFTER THE SILT
FENCE OUTLET IS REMOVED SHALL BE DRESSED TO CONFORM TO THE EXISTING
4. SITE OUTLETS AT ANY POINT SMALL CONCENTRATED FLOWS ARE ANTICIPATED AND AT THE GRADE, PREPARED AND SEEDED.
DIRECTION OF THE INSPECTOR.
4'-0" MAX. SPACING
(TYPICAL)
SILT FENCE
OUTLET
NOT TO SCALE
30.06C
25%
AREA
INLET ZONE 25%
/--OF SURFACE AREA
INLET ZONE 25%
GENERAL NOTES:
OF SURFACE AREA
1. DRIVE 5' STEEL POST AT LEAST
OUTLET ZONE 25%
24" INTO SOLID GROUND.
OF SURFACE AREA
2. USE STAPLES 1' APART
HORIZONTALLY AND VERTICALLY
F oTO TO THEACH THE WIRE FENCE. FABRIC
v / _ X
3. MINIMUM BAFFLE SPACING IS 10'.
FLOW a X 4. THE FLOOR OF THE BASIN IN
THE OUTLET ZONE AND BERMS
SHOULD BE SEEDED
a \ ' IMMEDIATELY AFTER THE BASIN
IS CONSTRUCTED.
5. REFER TO NCESCPDM SECTION
X #6.65 FOR ADDITIONAL
SPECIFIATIONS.
X�
\ X X�
700 g/2 5' STEEL
COIR FABRIC
OR EQUIVALENT
FL
B" X 6" TRENCH
BACKFILL AND COMPAC
FENCE AND FABRIC
BURIED IN TRENCH
BAFFLE INSTALLATION
NOT TO SCALE
30.19
GENERAL NOTES:
1. SEDIMENT SHALL BE REMOVED AND TRAP
RESTORED TO ITS ORIGINAL DIMENSIONS
WHEN THE SEDIMENT HAS ACCUMULATED
TO 1/2 THE DESIGN DEPTH OF THE TRAP.
2. REMOVED SEDIMENT SHALL BE DEPOSITED
IN A SUITABLE AREA AND IN SUCH A
MANNER THAT IT WILL NOT ERODE.
3. THE STRUCTURE SHALL BE INSPECTED BY
THE FINANCIALLY RESPONSIBLE PARTY OR
HIS AGENT AFTER EACH STORM EVENT
AND REPAIRS MADE AS NECESSARY.
4. CONSTRUCTION OPERATIONS SHALL BE CARRIED
OUT IN SUCH A MANNER THAT EROSION AND
WATER POLLUTION ARE MINIMIZED.
5. THE SEDIMENT TRAP SHALL BE REMOVED AND
THE AREA STABILIZED WHEN THE DRAINAGE
BASIN HAS BEEN PROPERLY STABILIZED.
6. ON LARGER DRAINAGE AREAS RIP RAP MAY
BE REQUIRED UNDER THE WASHED STONE.
GENERAL NOTES:
1. AREA UNDER EMBANKMENT SHALL BE CLEARED, GRUBBED, AND STRIPPED OF ANY VEGETATION AND ROOT MATERIAL. THE BASIN AREA SHALL BE CLEARED.
2. THE FILL MATERIAL FOR THE EMBANKMENT SHALL BE FREE OF ROOTS OR OTHER WOODY VEGETATION AS WELL AS OVERSIZED STONES ROCKS
ORGANIC MATERIAL OR OTHER OBJECTIONABLE MATERIAL. THE EMBANKMENT SHALL BE COMPACTED BY TRAVERSING WITH EQUIPMENT WHILE BEING
CONSTRUCTED. SPILLWAYS SHOULD NOT BE CONSTRUCTED THROUGH FILL SECTIONS. ALL SPILLWAYS SHOULD BE LINED AND/OR RIPRAPPED.
3. SEDIMENT SHALL BE REMOVED AND TRAP RESTORED TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO DEPTH SHOWN ON STANDARD.
REMOVED SEDIMENT SHALL BE DEPOSITED IN A SUITABLE AREA IN SUCH A MANNER THAT IT WILL NOT ERODE.
4. THE TRAP SHALL BE INSPECTED AFTER EACH RAIN AND REPAIRS MADE AS NECESSARY.
5. CONSTRUCTION OPERATION SHALL BE CARRIED OUT IN SUCH A MANNER THAT EROSION AND WATER POLLUTION IS MINIMIZED.
6. ALL CUT AND FILL SLOPES SHALL BE 2:1 OR FLATTER, UNLESS CERTIFIED BY REGISTERED GEOTECHICAL ENGINEER.
7, SEDIMENT BASIN EMBANKMENTS SHOULD BE PROVIDED WITH EROSION CONTROL AND STABILIZATION.
8. STORAGE AREA MAY BE CONSTRUCTED IN ANY SHAPE PROVIDED THE MINIMUM STORAGE VOLUME REQUIREMENT IS MET. THE BASIN SHOULD
ALSO BE ORIENTED SUCH THAT THE FILTER AND THE MAIN FLOW OF WATER AND SEDIMENT ARE ON OPPOSITE ENDS ON THE LONGER BASIN
DIMENSIONS.
9. THE LENGTH OF THE STONE OUTLET (SPILLWAY) IS TO BE BASED ON A 10 YEAR STORM.
10. WHENEVER TOPOGRAPHY ALLOWS, THE BASIN LENGTH SHOULD BE TWICE (2X) THE BASIN WIDTH, TO ALLOW FOR SETTLING.
BAFFLES SHALL BE INSTALLED IN ALL BASINS.
11. CLEANOUT STAKES SHALL BE PLACED IN ALL SEDIMENT BASINS AT THE LOW POINT IN THE BASIN. THE STAKES SHALL BE MARKED
SHOWING THE HALF FULL, CLEANOUT POINT, OF THE BASIN.
12. SAFETY FENCING 3' HIGH SHOULD BE PLACED AROUND ALL SEDIMENT BASINS.
13. FOR DESIGN OF SEDIMENT BASINS, REFER TO THE NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES,
EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL.
14. FOR SLOPES GREATER THAN 10' IN LENGTH AND PROTECTED BY SILT FENCE AT THE TOE OF THE SLOPE, SLOPE TERRACING WILL BE REQUIRED.
15. THE BERM ON SEDIMENT BASINS SHALL BE SEEDED ONCE FINAL GRADE HAS BEEN REACHED. THE SILT FENCE MAY BE REMOVED IF PERMISSION
HAS BEEN GRANTED BY THE CITY LAND DEVELOPMENT INSPECTOR AFTER THE GRASS HAS GERMINATED AND STABLE GROUND HAS BEEN
ESTABLISHED.
16. WASHED STONE AND WIRE BACKING SHALL BE USED WITH SILT FENCE WHENEVER SILT FENCE IS PLACED AT
THE TOE OF A SLOPE >10' VERTICAL OR ALONG ANY CHANNEL OR WATER COURSE
GENERAL_ NOTES SEDIMENT BASINS
30.0313
GENERAL NOTES:
1. RIPRAP SIZE TO BE DESIGNED BY ENGINEER.
1/0 \ / �o^� 2. CHECK DAMS MAY BE USED IN SLOPING DITCHES
OR CHANNELS TO SLOW VELOCITY OR TO CREATE
\ #5 WASHED STONE SEDIMENT TRAPS. 1'-6" MIN.
3. ENSURE THAT MAXIMUM SPACING BETWEEN DAMS PLACES THE # 5 WASHED STONE
TOE OF THE UPSTREAM DAM AT THE SAME ELEVATION AS THE
A STORAGE � DOWNSTREAM DAM (SEE DIAGRAM BELOW). 2
a
AREA A
CLASS B RIP RAP
FLOW
a
2' MAX
_ � a
0 0 - AT CENTER
o o -
0 0 - _ MAXIMUM SPACING
STORAGE
CATCH 4' ro s
GE o o _111=111=111�11=111 A - B
- =1 =111=III-111=III=III=111= I_
BASIN
=111=III=
Al A AND B ARE AT EQUAL ELEVATIONS
of CROSS SECTION
PLAN VIEW -6" MIN.
/ I 1 III�II=III= � 1=111-111 ,
w 111 �11-111W Ijl- 9" MIN. III1=J11
=1i!-1j1=_
#5 WASHED CD lFI1j 1= II �11=
STONE < w
< 111 III=1,.
FC�= OHa F j dl=
12" MIN. IiI'111- FILTER CLOTH
'1131„ ' I GATGH mB - �11 JI=nIII=1 - I - -III=_III-III ICI' 111111-
BASN 111= 111=111_111-11i111-111-1'_111-111_111-111=111=111=
3'-4'
SECTION A -A PLAN
NOT TO SCALE
STONE INLET PROTECTION
KEY/ANCHOR MATERIAL AT
TOP OF SLOPE.
JERAL NOTES:
LAY BLANKETS LOOSELY AND
STAKE OR STAPLE TO MAINTAIN
DIRECT CONTACT WITH THE SOIL
DO NOT STRETCH.
* DIMENSIONS SHOWN ARE
MINIMUM, MANUFACTURED
PRODUCTS MAY HAVE ADDITIONAL
REQUIREMENTS THAT MUST BE
M ET.
SLOPE SURFACE SHALL BE FREE
OF ROCKS, SOIL CLODS, STICKS,
GRASS. MAT/BLANKETS SHALL
HAVE GOOD SOIL CONTACT.
THE DETAIL SHOWN IS FOR SLOPE
MATTING. FOR CHANNEL OR PIPE
OUTFALL MATTING SPECIFICATIONS,
PLEASE REFER TO NCESCPDM
STANDARD #6.17 AND
MANUFACTURER'S GUIDELINES.
FABRIC 4' ABOVE SOURCE WATER.
KEY/ANCHOR MATERIAL TO TOE OF SLOPE.
EMBANKMENT MATTING DETAIL
NOT TO SCALE
30.20
NOT TO SCALE
TEMPORARY ROCK CHECK DAM STD. NQ REV.
30.1 OA 115,
NOTES:
1. A STABILIZED ENTRANCE PAD OF 2-3" OF WASHED STONE AND/OR RAILROAD BALLAST SHALL BE LOCATED WHERE TRAFFIC WILL ENTER OR LEAVE THE CONSTRUCTION SITE ONTO
A PUBLIC STREET.
2. FILTER FABRIC OR COMPACTED CRUSHER RUN STONE SHALL BE USED AS A BASE FOR THE CONSTRUCTION ENTRANCE.
3. THE ENTRANCE SHALL BE MAINTAINED IN A CONDITION WHICH WILL PREVENT TRACKING OR FLOWING OF SEDIMENT ONTO PUBLIC STREETS OR EXISTING PAVEMENT. THIS MAY
REQUIRE PERIODIC TOP DRESSING WITH ADDITIONAL STONE AS CONDITIONS WARRANT AND REPAIR OR CLEANOUT OF ANY MEASURES USED TO TRAP SEDIMENT.
4. ANY SEDIMENT SPILLED, DROPPED, WASHED, OR TRACKED ONTO PUBLIC STREETS MUST BE REMOVED IMMEDIATELY. ANY AGGREGATE TRACKED INTO THE ROADWAY MUST BE
SWEPT BACK ONSITE ON A NIGHTLY BASIS.
5. WHEN APPROPRIATE, WHEELS MUST BE CLEANED TO REMOVE SEDIMENT PRIOR TO ENTERING A PUBLIC STREET. WHEN WASHING IS REQUIRED, IT SHALL BE DONE IN AN AREA
STABILIZED WITH CRUSHED STONE WHICH DRAINS INTO AN APPROVED SEDIMENT BASIN SEE STD. N0. 30.11B.
6. CDOT MAY REQUIRE A STANDARD COMMERCIAL DRIVEWAY (STD. 10.24 & 10.25) TO ACCESS THE CONSTRUCTION SITE IF THE DRIVEWAY IS ON A THOROUGHFARE, OR ON ANY
STREET WITH AN EXISTING SIDEWALK TO REMAIN OPEN DURING CONSTRUCTION.
7. FOLLOW WORK AREA TRAFFIC CONTROL HANDBOOK (WATCH) FOR SIDEWALK CLOSURE OR DETOUR/DIVERSION.
100' MIN.
PUBLIC STREET
III III
EXISTING GROUND III
i_
III
III III -1 l i-1 I I -I I I
-III - SOIL STABILIZATION FABRIC
UNDER 2-3" OF WASHED STONE
EX. CONC.
100' MIN.
DRIVEWAY APRON
WITH SIDEWALK AT
BACK OF CURB
(IF RETAINED DURING
Z
~
w
CONSTRUCTION.)
U
NOT TO SCALE
STABILIZED CONSTRUCTION ENTRANCE STD. NQ. IREV.
30.11A 115,
6' MAX.
WOVEN FILTER FABRIC
STEEL POST
FILTER FABRIC
�a O
i
FLOW
Z
4"
ANCHOR SKIRT;
EXCAVATE
TRENCH AND
COMPACT
BACKFILL
GENERAL NOTES:
1. WOVEN FILTER FABRIC BE USED WHERE SILT FENCE IS TO REMAIN FOR A PERIOD OF
MORE THAN 30 DAYS.
2. STEEL POSTS SHALL BE 5'-O" IN HEIGHT AND BE OF THE SELF -FASTENER ANGLE STEEL
TYPE. MAINTENANCE NOTES:
3. TURN SILT FENCE UP SLOPE AT ENDS. 1. FILTER BARRIERS SHALL BE INSPECTED BY THE FINANCIALLY RESPONSIBLE PARTY
4. ORANGE SAFETY FENCE IS REQUIRED AT BACK OF SILT FENCE WHEN GRADING IS OR HIS AGENT IMMEDIATELY AFTER EACH RAINFALL AND AT LEAST DAILY DURING
PROLONGED RAINFALL. ANY REPAIRS NEEDED SHALL BE MADE IMMEDIATELY.
ADJACENT TO SWIM BUFFERS, STREAMS OR WETLANDS (REFER TO SWIM BUFFER
GUIDELINES). THE COLOR ORANGE IS RESERVED FOR VISUAL IDENTIFICATION OF 2. SHOULD THE FABRIC DECOMPOSE OR BECOME INEFFECTIVE PRIOR TO THE END
ENVIRONMENTALLY SENSITIVE AREAS. OF THE EXPECTED USABLE LIFE AND THE BARRIER STILL IS NECESSARY, THE
FABRIC SHALL BE REPLACED PROMPTLY.
5. DRAINAGE AREA CAN NOT BE GREATER THAN 1/4 ACRE PER 100 FT OF FENCE.
3. SEDIMENT DEPOSITS SHOULD BE REMOVED WHEN DEPOSITS REACH APPROX. HALF
6. SLOPE LENGTHS CAN NOT EXCEED CRITERIA SHOWN IN TABLE 6.62A NORTH CAROLINA THE HEIGHT OF THE BARRIER. ANY SEDIMENT DEPOSITS REMAINING IN PLACE
EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL. AFTER THE SILT FENCE IS REMOVED SHALL BE DRESSED TO CONFORM TO THE
EXISTING GRADE, PREPARED AND SEEDED.
7. DO NOT INSTALL SEDIMENT FENCE ACROSS STREAMS, DITCHES, WATERWAYS OR OTHER
AREAS OF CONCENTRATED FLOW.
TEMPORARY aLT FENCE
1" REBAR FOR BAT'
REMOVAL FROM INLI
(REBAR NOT INCLUDE[
OPTIONAL OVERFLOW
SILTSACK
DUMP LOOPS
(REBAR NOT INCLUDED)
CF�cTti, a v o �
4
'oft a a
v 0
NOT TO SCALEI
USE SILT SACKS ON ALL INLETS
CURB OPENING
EXPAI
RES
WIDTH = W
SIDE VIEW INSTALLED
SILTSACK® SPECIFICATIONS
NOTE: THE SILTSACK° WILL BE MANUFACTURED FROM A WOVEN POLYPROPYLENE
FABRIC THAT MEETS OR EXCEEDS THE FOLLOWING SPECIFICATIONS.
HI -FLOW SILTSACK®
(FOR AREAS OF MODERATE TO HEAVY PRECIPITATION AND RUN-OFF)
PROPERTIES TEST METHOD UNITS
GRAB TENSILE STRENGTH ASTM D-4632 265 LBS
GRAB TENSILE ELONGATION ASTM D-4632 20 %
PUNCTURE ASTM D-4833 135 LBS
MULLEN BURST ASTM D-3786 420 PSI
TRAPEZOID TEAR ASTM D-4533 45LBS
UV RESISTANCE ASTM D-4355 90 %
APPARENT OPENING SIZE ASTM D-4751 20 US SIEVE
FLOW RATE ASTM D-4491 200 GAL/MIN/SQ FT
PERMITTIVITY ASTM D-4491 1.5 SEC -1
DETAIL OF INLET SEDIMENT CONTROL DEVICE
WITH CURB DEFLECTOR
OIL-ABSORBANT SILTSACK(R
(FOR AREAS WHERE THERE IS A CONCERN FOR OIL RUN-OFF OR SPILLS)
DEPENDING ON YOUR PARTICULAR APPLICATION, THE SILTSACK© CAN BE MADE FROM
EITHER ONE OF THE ABOVE FABRICS WITH AN OIL-ABSORBANT PILLOW INSERT OR,
MADE COMPLETELY FROM AN OIL-ABSORBANT SILTSACK@, WITH A WOVEN PILLOW INSERT.
SILTSACK - INLET PROTECTION
N.T.S.
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REVISIONS:
C09 - DETAILS.DWG
PROJECT NUMBER: 221011
DATE: 2/4/2022 DRAWN BY: KIW
SHEET CO9 OF 12
C09 - DETAILS.DWG - PLOT: Kennedy - WED. 2-16-2022 8:47 AM