HomeMy WebLinkAbout002 C102.pdfCROSS SECTION VIEW
NOTE:
STABILIZE DIVERSION DITCH WITH TEMPORARY SEEDING AND EROSION CONTROL NETTING. POSITIVE
GRADE MUST BE PROVIDED TO ASSURE DRAINAGE. WHERE DIVERSION WILL EXPERIENCE HIGH FLOWS
OR VELOCITIES. STABILIZE WITH PERMANENT EROSION CONTROL BLANKET OR RIP RAP.
CONSTRUCTION SPECIFICATIONS
1. REMOVE AND PROPERLY DISPOSE OF AH TREES, BRUSH, STUMPS, AND OTHER OBJECTIONABLE MATERIAL
FILL AND COMPACT ALL DITCHES, SWALES, OR GULLIES THAT WILL BE CROSSED TO NATURAL GROUND LEVEL
OR ABOVE.
2. JUST BEFORE PLACEMENT OF FILL, THE BASE OF THE RIDGE SHOULD BE DISKED BY MACHINERY.
3. EXCAVATE, SHAPE, AND STABILIZE THE DIVERSION TO LINE, GRADE, AND CROSS SECTION, AS REQUIRED IN
THE DESIGN PLAN.
4. COMPACT THE RIDGE TO PREVENT UNEQUAL SETTLEMENT, AND TO PROVIDE STABILITY AGAINST SEEPAGE.
5. VEGETATIVELY STABILIZE 'THE DIVERSION AFTER ITS INSTALLATION.
MAINTENANCE
INSPECT PERMANENT DIVERSIONS AFTER EVERY RAINFALI DURING THE CONSTRUCTION OPERATION.
IMMEDIATELY REMOVE ANY OBSTRUCTIONS FROM THE FLOW AREA, AND REPAIR THE DIVERSION RIDGE, CHECK
OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED. MAINTAIN THE VEGETATION IN A VIGOROUS, HEAL -MY
CONDITION AT ALL TIMES.
PERMANENT DIVERSION DE1 . AIL
NOT TO SCALE
PERSPECTIVE VIEW
CLASS B RIPRAP (SEE SECTION THRU BASIN BELOW)
,55��RIP RAP HEADWALL
INVERT PIPE
#57 WASHED STONE. 1- MCK x 3' HIGH MIN.
SEDIMENT STORAGE AREA
SECTION THRU BASIN, FILTER AND CULVERT PIPE
SEDIMENT STORAGE
1%,
AKtAzo ju ot ulz lumDr-u FLOOD STORAGE ZONE PIPE INVERT
(CUT,FILL,ETC.) i'l 21 RIPRAP HEADWALL
NATURAL GROUND
FLOW
LX--- #57 WASHED STONE
MAX. SEDIMENT DEPTH (CLEAN OUT POINT)
1. DIMENSIONS ARE MINIMUN ACCEPTABLE UNLESS OTHERWISE NOTED.
2. GRAVEL & RIP RAP FILTER BERM BASIN DETAILIS DESIGNED TO PROTECT
EXISTING PIPE INVERTS THAT DRAIN 10 ACRES OR LESS.
QQNSTRUCTION 5PEC1E1CAT12N5_:
1. CLEAR THE AREA OF ALL DEBRIS THAT MIGHT HINDER EXCAVATION AND DISPOSAL OF SPOIL.
2. INSTALL THE CLASS 8 OR CLASS I RIPRAP 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 RIPRAP 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 T14E EMBANKMENT OR DIVERSIONS.
3. A 1 FOOT THICK LAYER OF NC DOT #5 OR #57 STONE SHOULD BE PLACED ON THE OUTSIDE SLOPE OF THE RIPRAP.
4. THE SEDIMENT STORAGE AREA SHOULD BE EXCAVATED AROUND THE OUTSIDE OF THE STONE HORSESHOE 18 INCHES BELOW NATURAL GRADE.
5. MEN THE CONTRIBUTING DRAINAGE AREA HAS BEEN STABILIZED, FILL DEPRESSION AND ESTABLISH FINAL GRADING ELEVATIONS, COMPACT AREA
PROPERLY, AND STABILIZE WITH GROUND COVER.
MAINTENANCE:
INSPECT ROCK PIPE INLET PROTECTION AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (14 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 DEPTH 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 RIPRAP 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 UNSTABIF SEDIMENT.
SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND PROVIDE PERMANENT GROUND COVER (SURFACE STABILIZATION).
TEMPORARY ROCK PIPE INLET PROTECTION DETAIL
BAFFLE (TYP.)
SEDIMENT PIT,,�.,
EARTH EMBARKMENT
Is
a
INLET ZONE
35% OF SURFACE AREA
CROSS SECTION VIEW
FIRST CHAMBER
NOTES
CLASS I RIPRAP OUTLET SHOWN. SEE
25% OF SURFACE AREA
PLAN FOR ACTUAL OUTLET TYPE.
1. DIMENSIONS ARE MINIMUN ACCEPTABLE UNLESS OTHERWISE NOTED.
STAKE TO
SECOND CHAMBER
25% OF SURFACE AREA
QQN5TRUCT1QN 5PECIFICATIQNS:
SUPPORT WIRE
PLAN VIEW
OUTLET ZONE
1. CI FAR THE AREA OF ALL DEBRIS THAT MIGHT HINDER EXCAVAT`ION AND DISPOSAL OF SPOIL.
15% OF SURFACE AREA
QN
2. GRADE SHALLOW DEPRESSION UNIFORMLY TOWARDS THE INLET WITH SIDE SLOPES NO GREATER THAN 2:1, GRADE A 1-FOOT WIDE LEVEL AREA SET 4
/SUPPORT POST, 2e
INCHES BELOW THE AREA ADJACENT TO THE INLET.
IN 10 BUI IOM OR SIDE
3. INSTALL THE CLASS 8 OR CLASS I RIPRAP IN A CIRCLE AROUND THE INLET. THE MINIMUM CREST WIDTH OF THE RIPRAP SHOULD BE 18 INCHES, NTH
A MINIMUM BOTTOM WIDTH OF 7.5 FEET. THE MINIMUM HEIGHT OF THE STONE IS 2 FEET.
PLAN VIEW
SUPPORT ROPE TO WIRE
4. THE OUTSIDE FACE OF THE RIPRAP IS THEN LINED WITH 12 INCHES OF NC DOT #5 OR #57 WASHED STONE.
COIR MESH OR SIMIUAR,
TO PREVENT SAGGING
STAPLED OR TRENCHED
CONSTRUCTION SPECIFICATIONS,
MAINTENANCE:
INTO BOTTOM OR SIDE
1. GRADE THE BASIN SO THAT THE BOTTOM IS LEVEL FRONT TO BACK AND SIDE TO SIDE.
INSPECT ROCK DOUGHNUT INLET PROTECTION AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (% INCH OR GREATER) RAINFALL EVENT AND REPAIR
BAFFLE
2, INSTALL POSTS OR SAW HORSES ACROSS THE WIDTH OF THE SEDIMENT TRAP.
IMMEDIATELY.
3. STEEL POSTS SHOULD BE DRIVEN TO A DEPTH OF 24 INCHES, SPACED A MAXIMUM OF 4 FEET APART. AND
TO PROVIDE SATISFACTORY INLET PROTECTION EFFICIENCY, REMOVE SEDIMENT FROM THE SEDIMENT POOL AREA WHEN THE VOLUME IS DECREASED BY
INSTALLED UP THE SIDES OF THE BASIN AS WELL THE TOP OF THE FABRIC SHOULD BE 6 INCHES HIGHER THAN
HALF- THIS WILL HELP PROVIDE ADEQUATE STORAGE VOLUME FOR THE NEXT RAIN. STABILIZE EXCAVATED MATERIAL APPROPRIATELY.
MAINTENANCE
THE INVERT OF THE SPILLWAY- TOPS OF BAFFLES SHOULD BE 2 INCHES LOWER THAN THE TOP OF THE BERMS.
SPECT BAFFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY
TAKE CARE NOT TO DAMAGE OR UNDERCUT THE STRUCTURE DURING SEDIMENT REMOVAL. REMOVE DEBRIS FROM THE INLET AND REPLACE STONE AS
REQUIRED REPAIRS IMMEDIATELY.
4. INSTALL, AT LEAST THREE ROWS OF BAFFLES BETWEEN THE INLET AND OUTLET DISCHARGE POINT, BASINS LESS
NEEDED. IF THE INLET WAS COVERED NTH WIRE MESH THE MESH SHOULD BE CLEANED OF DEBRIS.
THAN 20 FEET IN LENGTH MAY USE 2 BAFFLES.
BE SURE TO MAINTAIN ACCESS TO THE BAFFLES. SHOULD THE FABRIC OF A BAFFLE
COLLAPSE, TEAR. DECOMPOSE, OR BECOME INEFFECTIVE, REPLACE IT PROMPTLY.
5. WHEN USING POSTS, ADD A SUPPORT WIRE OR ROPE ACROSS THE TOP OF THE MEASURE TO PREVENT SAGGING.
W14EN THE CONTRIBUTING DRAINAGE AREA HAS BEEN ADEQUATELY STABILIZED, REMOVE ALL MATERIALS AND DISPOSE OF SEDIMENT PROPERLY. BRING THE
DISTURBED AREA TO THE GRADE OF THE DROP INLET. SMOOTH AND COMPACT IT AS NEEDED.
REMOVE SEDIMENT DEPOSITS WHEN IT REACHES HALF FUH TO PROVIDE ADEQUATE
6. WRAP POROUS MATERIAL, LIKE JUTE BACKED BY COIR MATERIAL. OVER A SAWHORSE OR THE TOP WIRE
STORAGE VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE BAFFLES.
HAMMER REBAR INTO THE SAWHORSE LEGS FOR ANCHORING. THE FABRIC SHOULD HAVE FIVE TO TEN PERCENT
APPROPRIATELY STABILIZE ALL BARE AREAS AROUND THE INLET NTH GROUND COVER.
TAKE CARE To AVOID DAMAGING THE BAFFLES DURING CLEANOUT. SEDIMENT DEPTH
OPENINGS IN THE WEAVE, ATTACH FABRIC TO A ROPE AND A SUPPORT STRUCTURE WITH ZIP TIES. WIRE, OR
SHOULD NEVER EXCEED HALF THE DESIGNED STORAGE DEPTH.
STAPLES.
AFTER THE CONTRIBUTING DRAINAGE AREA HAS 13EEN PROPERLY STABILIZED, REMOVE
7. THE BOTTOM AND SIDES OF THE FABRIC SHOULD BE ANCHORED IN A TRENCH OR PINNED WITH 5-INCH EROSION
TEMPORARY ROCK DOUGHNUT INLET PROTECTION DETAIL
ALL BAFFLE MATERIALS AND UNSTABLE SEDIMENT DEPOSITS, BRING THE AREA M
CONTROL MATTING STAPLES.
NOT TO SCALE
GRADE. AND STABILIZE IT..
B. DO NOT SPLICE THE FABRIC, BUT USE A CONTINUOUS PIECE ACROSS THE BASIN.
BAFFLES INSIDE SEDIMENT BASIN DETAIL
NOT TO SCALE
L
MAX
LENOTH TO
VADTH RATIO
law
(CU. FT.
PER AQ
DISTURBED)
i
AVEM
WID"
ARE
SURFA
PRIMA"
I a W.13 iNk I Ej I zkylvi
BAFFLES
31MM0
6* MAX. DEPTH OF FLOW
OVER EMERGENCY SPILLWAY-
Z=5 # MAX.-, MIN. 11, -
H=2' MIN. I
CROSS-SECTION VIEW
N,TS.
NOTES:
1 . REFER TO NCESCPDM
IKMENT SECTION #6.64 FOR
ADDITIONAL DESIGN
SPECIFICA11ONS
REGARDING SKIMMER
SEDIMENT BASINS.
2. INSTALL FAIRCLOTH
SKIMMER OR APPROVED
EQUAL PER
MANUFACTURES
REQUIREMENTS AND
INSTALLATION DETAILS.
3. REFER BAFFLE DETAILS
.RGENCY
IWAY FOR BAFFLE SPACING AND
INSTALLATION.
W=5' MIN.
EMBANKMENT
I- r- T=1.5' MIN.
w9mmam
MIIIIIIIIIIIIIIIII
am
11101111
M 0
FILTER OF # 57
WASHED STONE
SILT FENCE FABRIC TO
OVERLAP HARDWARE
CLOTH BY 12 INCHES
STEEL FENCE
IFLOW DIRECTION
WIRE FENCE-----,. PLAN VIEW `-STEEL FENCE POST
HARDWARE CLOTH----,j
FILTER OF # 57 NOTE-
1. APPLICABLE FOR DRAINAGE AREAS NO MORE THAN 1/4 ACRE.
WASHED STONE P,
2� USE AS A REPAIR OF SILT FENCE FAILURES.
1801
3. BURY WIRE FENCE, HARDWARE CLOTH, AND SILT FENCE FABRIC 6 INCHES.
FLOW DIRECTION 4-1;
7
SIDE VIEW
SILT FENCE
Li H u Li
FRONT VIEW
TEMPORARY SILT FENCE OUTLET DETAIL
NOT TO SCALE
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CONSTRUCTION SPECIFICATIONS
MATERIALS
1. USE A SYNTHETIC FILTER FABRIC OF AT LEAST 95% BY WEIGHT OF POLYOLEFINS OR POLYESTER, WHICH IS CERTIFIED BY THE MANUFACTURER OR SUPPLIER AS CONFORMING TO THE REQUIREMENTS
IN ASTM D 6461.
SYNTHE71C FILTER FABRIC SHOULD CONTAIN ULTRAVIOLET RAY INHIBITORS AND STABILIZERS TO PROVIDE A MINIMUM OF 6 MONTHS OF EXPECTED USABLE CONSTRUCTION LIFE AT A TEMPERATURE
RANGE OF 0 TO 120' F.
2. ENSURE THAT POSTS FOR SEDIMENT FENCES ARE 1.33 LB/I_1NEAR FT STEEL WITH A MINIMUM LENGTH OF 5 FEET. MAKE SURE THAT STEEL POSTS HAVE PROJECTIONS TO FACILITATE FASTENING THE
FABRIC.
3. FOR REINFORCEMENT OF STANDARD STRENGTH FILTER FABRIC, USE WIRE FENCE WITH A MINIMUM 14 GAUGE AND A MAXIMUM MESH SPACING OF 6 INCHES.
C0NSjRQQ11QN
1. CONSTRUCT THE SEDIMENT BARRIER OF STANDARD STRENGTH OR EXTRA STRENGTH SYNTHETIC FILTER FABRICS.
2. ENSURE THAT THE HEIGHT OF THE SEDIMENT FENCE DOES NOT EXCEED 24 INCHES ABOVE THE GROUND SURFACE. (HIGHER FENCES MAY IMPOUND VOLUMES OF WATER SUFFICIENT TO CAUSE
FAILURE OF THE STRUCTURE.)
3. CONSTRUCT THE FILTER FABRIC FROM A CONTINUOUS ROLL CUT TO THE LENGTH OF THE BARRIER TO AVOID JOINTS. WHEN JOINTS ARE NECESSARY, SECURELY FASTEN THE FILTER CLOTH ONLY AT
A SUPPORT POST WITH 4 FEET MINIMUM OVERLAP TO THE NEXT POST.
4- SUPPORT STANDARD STRENGTH FILTER FABRIC BY "RE MESH FASTENED SECURELY TO THE UPSLOPE SIDE OF -THE POSTS. EXTEND THE WIRE MESH SUPPORT TO THE BOTTOM OF THE TRENCH.
FASTEN T14E WIRE REINFORCEMENT, THEN FABRIC ON THE UPSLOPE SIDE OF THE FENCE POST WIRE OR PLASTIC ZIP TIES SHOULD HAVE MINIMUM 50 POUND TENSILE STRENGTH.
5. WHEN A "RE MESH SUPPORT FENCE IS USED, SPACE POSTS A MAXIMUM OF 8 FEET APART. SUPPORT POSTS SHOULD BE DRIVEN SECURELY INTO THE GROUND A MINIMUM OF 24 INCHES.
6. EXTRA STRENGTH FILTER FABRIC NTH 6 FEET POST SPACING DOES NOT REQUIRE WIRE MESH SUPPORT FENCE. SECURELY FASTEN THE FILTER FABRIC DIRECTLY TO POSTS. WIRE OR PLASTIC ZIP
TIES SHOULD HAVE MINIMUM 50 POUND TENSILE STRENGTH.
7. EXCAVATE A TRENCH APPROXIMATELY 4 INCHES WIDE AND 8 INCHES DEEP ALONG THE PROPOSED LINE OF POSTS AND UPSLOPE FROM THE BARRIER.
8. PLACE 12 INCHES OF THE FABRIC ALONG THE BOTTOM AND SIDE OF THE TRENCH.
9. BACKFILL THE TRENCH WITH SOIL PLACED OVER THE FILTER FABRIC AND COMPACT. THOROUGH COMPACTION OF THE BACKFILL IS CRITICAL TO SILT FENCE PERFORMANCE.
10. DO NOT ATTACH FILTER FABRIC TO EXISTING TREES.
MAINTENANCE
INSPECT SEDIMENT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL, MAKE ANY REQUIRED REPAIRS IMMEDIATELY.
SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSEt TEAR, DECOMPOSE OR BECOME INEFFECTIVE, REPLACE IT PROMPTLY.
REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE FENCE. TAKE CARE TO AVOID UNDERMINING THE FENCE
DURING CLEANOUT.
REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS AND BRING THE AREA TO GRADE AND STABILIZE IT AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED,
SILT FENCE DETAIL
NOT TO SCALE
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HAROLD J. MARVIN
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P. E.
CONSULTING ENGINEER
4124
WANDERING
LN. N.E.
HICKORY, NC
28601
PHONE (82V 320-3367
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