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SEDIMENT TRAP DESIGN AND CONSTRUCTION NOTES �" `�'"
SKIMMER BASIN DESIGN AND CONSTRUCTION NOTES SEDIMENT BASIN DESIGN AND CONSTRUCTION NOTES i1�1111I�II I I-II1-
Ftguxe�,h@hG+�Tt�llatlssxstlpre�.Qf+rtrAsR-st�fi©n. ISOMETRIC VIEW , •
1. SKIMMER BASINS DESIGNED WITH A TRAPEZOIDAL SPILLWAY WITH IMPERMEABLE MEMBRANE; 1. SEDIMENT TRAPS DESIGNED WITH A STONE SPILLWAY WITH MAXIMUM DRAINAGE AREA OF 1 1. SEDIMENT BASINS DESIGNED WITH A RISER/BARREL PIPE PRINCIPAL SPILLWAY AND LEVEL SPREADER DETAIL
MAXIMUM DRAINAGE AREA OF 10 ACRES; MINIMUM VOLUME OF 1800 CUBIC FEET PER ACRE ACRE; MINIMUM VOLUME OF 3600 CUBIC FEET PER ACRE OF DISTURBED AREA; MINIMUM TRAPEZOIDAL EMERGENCY SPILLWAY; MAXIMUM DRAINAGE AREA OF 100 ACRES; MINIMUM
OF DISTURBED AREA; MINIMUM SURFACE AREA OF 325 'SQUARE FEET PER CFS OF Q25 VOLUME OF 1800 CUBIC FEET PER ACRE OF DISTURBED AREA; MINIMUM SURFACE AREA OF MINIMUM
SURFACE AREA OF 435 SQUARE FEET PER CFS OF Q25 PEAK INFLOW; MINIMUM CLASS B STONE
PEAK INFLOW; MINIMUM LENGTH WIDTH RATIO OF 2:1; t\vIAXIMUM LENGTH RATIO OF 6:1; 435 SQUARE FEET PER CFS OF Q25 PEAK INFLOW; MINIMUM LENGTH/WIDTH RATIO OF 2:1; NOT TO SCALE • •• ?�
/ LENGTH/WIDTH RATIO OF 2:1; MINIMUM DEPTH OF 3.5 FEET, 1.5 FEET EXCAVATED BELOW
MINIMUM DEPTH OF 2 FEET; SKIMMER WITH ORIFICE WITH MINIMUM DEWATERING TIME OF 2 MAXIMUM LENGTH RATIO OF 6:1; MINIMUM DEPTH OF 2 FEET; SKIMMER WITH ORIFICE WITH A EARTH BERM DITCH BLOCK
DAYS; AND 3 BAFFLES. GRADE; MAXIMUM HEIGHT - WEIR ELEVATION 3.5 FEET ABOVE GRADE; AND 3 BAFFLES. MINIMUM DEWATERING TIME OF 3 DAYS; AND 3 BAFFLES.
2. CLEAR, GRUB, AND STRIP AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT 2 CLEAR, GRUB, AND STRIP AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT 2, SITE PREPARATION CLEAR, GRUB, AND STRIP AREA UNDER THE EMBANKMENT OF ALL )
MAT. REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF ORGANIC MATTER AND v
MAT. REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF ORGANIC MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY. HAUL ALL OBJECTIONABLE MATERIAL TO THE TREES, VEGETATION AND ROOTS. AND OTHER OBJECTIONABLE MATERIAL. DELAY CLEARING LEVEL SPREADER DESIGN AND CONSTRUCTION NOTES
STOCKPILE OR DISPOSE OF IT PROPERLY. HAUL ALL O DESIGNATED
BJECTIONABLE MATERIAL TO THETHE POOL AREA UNTIL THE DAM IS COMPLETE AND THEN REMOVE BRUSH, TREES, AND B.0 FT.MIN. o
DISPOSAL AREA. SUMP LOCATION z.o Fr.MIN. Do
DESIGNATED DISPOSAL AREA. PLACE TEMPORARY SEDIMENT CONTROL MEASURES BELOW OTHER OBJECTIONABLE MATERIALS TO FACILITATE SEDIMENT CLEANOUT. STOCKPILE ALL
BASIN A MINIMUM OF 10 FEET FROM THE STRUCTURE AS (NEEDED. 3. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY TOPSOIL OR SOIL CONTAINING ORGANIC MATTER FOR USE ON THE OUTER SHELL OF THE 1. THE MATTING SHOULD BE A MINIMUM OF 4 FEET WIDE EXTENDING 6 INCHES OVER THE LIP
VEGETATION, ORGANIC MATTER, AND OTHER OBJECTIONABLE MATERIAL. PLACE THE FILL IN EMBANKMENT TO FACILITATE VEGETATIVE ESTABLISHMENT. PLACE TEMPORARY SEDIMENT AND BURIED 6 INCHES DEEP IN A VERTICAL TRENCH ON THE LOWER EDGE. THE UPPER ►
3. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY LIFTS NOT TO EXCEED 9 INCHES AND MACHINE COMPACT IT. OVER FILL THE EMBANKMENT 6 CONTROL MEASURES BELOW THE BASIN AS NEEDED. EDGE SHOULD BUILT AGAINST SMOOTH CUT SOD AND BE SECURELY HELD IN PLACE WITH
VEGETATION, ORGANIC MATTER, AND OTHER OBJECTIONABLE MATERIAL. PLACE THE FILL IN INCHES TO ALLOW FOR SETTLEMENT. CLOSELY SPACED HEAVY DUTY WIRE STAPLES AT LEAST 12 INCHES LONG.
LIFTS NOT TO EXCEED 9 INCHES AND MACHINE COMPACT IT. OVER FILL THE EMBANKMENT 6 3. CUT-OFF TRENCH - EXCAVATE A CUT-OFF TRENCH ALONG THE CENTER LINE OF THE
INCHES TO ALLOW FOR SETTLEMENT. 4. CONSTRUCT THE OUTLET SECTION IN THE EMBANKMENT. PROTECT THE CONNECTION EARTH FILL EMBANKMENT. CUT THE TRENCH TO STABLE SOIL MATERIAL, BUT IN NO CASE 2. ENSURE THAT THE SPREADER LIP IS LEVEL FOR UNIFORM SPREADING OF STORM RUNOFF. `
BETWEEN THE RIPRAP AND THE SOIL FROM PIPING BY USING FILTER FABRIC OR A KEYWAY MAKE IT LESS THAN 2 FEET DEEP. THE CUT-OFF TRENCH MUST EXTEND INTO BOTH 3, CONSTRUCT THE LEVEL SPREADER ON UNDISTURBED SOIL NOT ON FILL . TOP OF BERM) SLOPE DRAIN
4. SHAPE BASIN TO THE SPECIFIED DIMENSIONS. PREVENT THE SKIMMING DEVICE FROM CUTOFF TRENCH BETWEEN THE RIPRAP STRUCTURE AND SOIL: 1) PLACE THE FILTER FABRIC ABUTMENTS TO AT LEAST THE ELEVATION OF THE RISER CREST. MAKE THE MINIMUM BOTTOM ( )
SETTLING INTO THE MUD BY EXCAVATING A SHALLOW PIT UNDER THE SKIMMER OR BETWEEN THE RIPRAP AND THE SOIL. EXTEND THE FABRIC ACROSS THE SPILLWAY WIDTH WIDE ENOUGH TO PERMIT OPERATION OF EXCAVATION AND COMPACTION EQUIPMENT, 4. CONSTRUCT A 20-FOOT TRANSITION SECTION FROM THE DIVERSION CHANNEL TO BLEND
PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR TIMBER. FOUNDATION AND SIDES TO THE TOP OF THE DAM; OR 2) EXCAVATE A KEYWAY TRENCH BUT IN NO CASE LESS THAN 2 FEET. MAKE SIDE SLOPES OF THE TRENCH NO STEEPER SMOOTHLY TO THE WIDTH AND DEPTH OF THE SPREADER.
5. PLACE THE BARREL TYPICALLY 4-INCH SCHEDULE 40 PVC PIPE ON A FIRM, SMOOTH ALONG THE CENTER LINE OF THE SPILLWAY FOUNDATION EXTENDING UP THE SIDES TO THE THAN 1:1. KEEP THE TRENCH DRY DURING BACKFILLING AND COMPACTION OPERATIONS. N
( ) 5. DISPERSE RUNOFF FROM THE SPREADER ACROSS A PROPERLY STABILIZED SLOPE NOT TO BE TABLE FOR
FOUNDATION OF IMPERVIOUS SOIL. DO NOT USE PERVIOUS MATERIAL SUCH AS SAND, HEIGHT OF THE DAM. THE TRENCH SHOULD BE AT LEAST 2 FEET DEEP AND 2 FEET WIDE 4. EMBANKMENT - TAKE FILL MATERIAL FROM THE APPROVED AREAS SHOWN ON THE PLANS. EXCEED 10%. MADE SURE THE SLOPE IS SUFFICIENTLY SMOOTH TO KEEP FLOW FROM ENERGY DISSIPATER w
GRAVEL, OR CRUSHED STONE AS BACKFILL AROUND THE PIPE. PLACE THE FILL MATERIAL WITH 1:1 SIDE SLOPES. T SHOULD BE CLEAN MINERAL SOIL, FREE OF ROOTS, WOODY VEGETATION, ROCKS, AND CONCENTRATING. A �
IMMEDIATELY AFTER ITS CONSTRUCTION, APPROPRIATELY SEED AND MULCH THE ENTIRE BE CLEAR THE POND AREA
AROUND THE PIPE SPILLWAY IN 4-INCH LAYERS AND COMPACT IT UNDER AND AROUND THE LOW THE ELEVATION OF THE CREST OF THE SPILLWAY TO OTHER OBJECTIONABLE MATERIAL. SCARIFY AREAS ON WHICH FILL IS TO BE PLACED BEFORE INLET PROTECTION DETAIL 0
PIPE TO AT LEAST THE SAME DENSITY AS THE ADJACENT EMBANKMENT. CARE MUST BE 5. FACILITATE SEDIMENT CLEANOUT.BE T. PLACING FILL. THE FILL MATERIAL MUST CONTAIN SUFFICIENT MOISTURE SO IT CAN BE 6. DISTURBED AREA OF THE SPREADER. 0
TAKEN NOT TO RAISE THE PIPE FROM THE FIRM CONTACT WITH ITS FOUNDATION WHEN FORMED BY HAND INTO A BALL WITHOUT CRUMBLING. IF WATER CAN BE SQUEEZED OUT OF -
COMPACTING BACKFILL UNDER THE PIPE HAUNCHES. PLACE A MINIMUM DEPTH OF 2 FEET OF 6, ALL CUT AND FILL SLOPES SHOULD BE 2:1 OR FLATTER. THE BALL, IT IS T00 WET FOR PROPER COMPACTION. PLACE FILL MATERIAL IN 6 TO 8 INCH PERMANENT DIVERSION MAINTENANCE NOTES Li
N NO PIPE
SPILLWAY
WITH
7. ENSURE THAT THE STONE (DRAINAGE) SECTION OF THE EMBANKMENT HAS A MINIMUM TYPICAL SLOPE DRAIN DETAIL
CONTINUOUS LAYERS OVER THE ENTIRE LENGTH OF THE FILL AREA AND COMPACT IT.
COMPACTION MAY BE OBTAINED BY ROUTING THE CONSTRUCTION HAULING EQUIPMENT OVER 1. INSPECT LEVEL SPREADERS AFTER EVERY RAINFALL UNTIL VEGETATION IS ESTABLISHED, AND w
THROUGH THE DAM AFTER THE EMBANKMENT IS COMPLETE. BOTTOM WIDTH OF 3 FEET AND MAXIMUM SIDE SLOPES OF 1:1 THAT EXTEND TO THE THE FILL SO THAT THE ENTIRE SURFACE OF EACH LAYER IS TRAVERSED BY AT LEAST ONE PROMPTLY MAKE NEEDED REPAIRS. AFTER THE AREA HAS BEEN STABILIZED, MAKE PERIODIC 0 a
BOTTOM OF THE SPILLWAY SECTION. NOT TO SCALE o 0
- 6. ASSEMBLE THE SKIMMER FOLLOWING THE MANUFACTURERS INSTRUCTIONS, OR AS DESIGNED.
WHEEL OR TREAD TRACK OF HEAVY EQUIPMENT, OR A COMPACTOR MAY BE USED. INSPECTIONS AND PEEP VEGETATION IN A HEALTHY VIGOROUS CONDITION. n w
CONSTRUCT THE EMBANKMENT TO AN ELEVATION 10 PERCENT HIGHER THAN THE DESIGN > >
8. CONSTRUCT THE MINIMUM FINISHED STONE SPILLWAY BOTTOM WIDTH, AS SHOWN ON THE
FAIRCLOTH TYPE OR EQUIVALENT SKIMMER TO BE USED. PLANS, WITH 2:1 SIDE SLOPES EXTENDING TO THE TOP OF THE OVER FILLED EMBANKMENT. HEIGHT TO ALLOW FOR SETTLING. C) Lu
7. LAY THE ASSEMBLED SKIMMER ON THE BOTTOM OF THE BASIN WITH THE FLEXIBLE JOINT AT KEEP THE THICKNESS OF THE SIDES OF THE SPILLWAY OUTLET STRUCTURE AT A MINIMUM SLOPE DRAIN DESIGN AND CONSTRUCTION NOTES
THE INLET OF THE BARREL PIPE. ATTACH THE FLEXIBLE JOINT TO THE BARREL PIPE AND OF 21 INCHES. THE WEIR MUST BE LEVEL AND CONSTRUCTED TO GRADE TO ASSURE 5. CONDUIT SPILLWAYS - SECURELY ATTACH THE RISER TO THE BARREL OR BARREL STUB MAKE A WATERTIGHT STRUCTURAL CONNECTION. SECURE ALL CONNECTIONS BETWEEN BARREL
N
POSITION THE SKIMMER OVER THE EXCAVATED PIT OR SUPPORT. BE SURE TO ATTACH A DESIGN CAPACITY. w
SECTIONS BY APPROVED WATERTIGHT ASSEMBLIES PLACE THE BARREL AND RISER ON A
ROPE TO THE SKIMMER AND ANCHOR IT TO THE SIDE OF THE BASIN. THIS WILL BE USED . o M
TO PULL THE SKIMMER TO THE SIDE FOR MAINTENANCE. 9. MATERIAL USED IN THE STONE SECTION SHOULD BE A WELL-GRADED MIXTURE OF STONE FIRM, SMOOTH FOUNDATION OF IMPERVIOUS SOIL. DO NOT USE PERVIOUS MATERIAL SUCH PLACE SLOPE DRAINS ON UNDISTURBED SOIL OR WELL COMPACTED FILL AT LOCATIONS AND o \
WITH A d50 SIZE OF 9 INCHES (CLASS B EROSION CONTROL STONE IS RECOMMENDED) AS SAND, GRAVEL, OR CRUSHED STONE AS BACKFILL AROUND THE PIPE OR ANTI-SEEP ELEVATIONS SHOWN ON THE PLAN. N
8. EARTHEN SPILLWAYS - INSTALL THE SPILLWAY IN UNDISTURBED SOIL TO THE GREATEST AND A MAXIMUM STONE SIZE OF 14 INCHES. THE STONE MAY BE MACHINE PLACED AND COLLARS. PLACE THE FILL MATERIAL AROUND THE PIPE SPILLWAY IN 4-INCH LAYERS, AND 2. SLIGHTLY SLOPE THE SECTION OF PIPE UNDER THE DIKE TOWARD ITS OUTLET.
EXTENT POSSIBLE. THE ACHIEVEMENT OF PLANNED ELEVATIONS, GRADE, DESIGN WIDTH, AND THE SMALLER STONES WORKED INTO THE VOIDS OF THE LARGER STONES, THE STONE COMPACT IT UNDER AND AROUND THE PIPE TO AT LEAST THE SAME DENSITY AS THE B
ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE SUCCESSFUL OPERATION OF SHOULD BE HARD, ANGULAR, AND HIGHLY WEATHER-RESISTANT. ADJACENT EMBANKMENT. CARE MUST BE TAKEN NOT TO RAISE THE PIPE FROM FIRM 3. HAND TAMP THE SOIL UNDER AND AROUND THE ENTRANCE SECTION IN LIFTS NOT TO
THE SPILLWAY. THE SPILLWAY SHOULD BE LINED WITH LAMINATED PLASTIC OR IMPERMEABLE CONTACT WITH ITS FOUNDATION WHEN COMPACTING UNDER THE PIPE HAUNCHES, PLACE A - EXCEED 6 INCHES.
GEOTEXTILE FABRIC. THE FABRIC MUST BE WIDE AND LONG' ENOUGH TO COVER THE BOTTOM 10. DISCHARGE INLET WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION, USE MINIMUM DEPTH OF 2 FEET OF COMPACTED BACKFILL OVER THE PIPE SPILLWAY BEFORE 4 R THAT FILL OVER THE DRAIN AT THE TOP OF THE SLOPE HAS MINIMUM DIMENSIONS
AND SIDES AND EXTEND ONTO THE TOP OF THE DAM FOR ANCHORING IN A TRENCH. THE TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH OUTLET PROTECTION TO DIVERT CROSSING IT WITH CONSTRUCTION EQUIPMENT. ANCHOR THE RISER IN PLACE BY CONCRETE OF 1 E L 0 E E D N E
EDGES MAY BE SECURED WITH 8-INCH STAPLES OR PINS. THE FABRIC MUST BE LONG SEDIMENT-LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP OR OTHER SATISFACTORY MEANS TO PREVENT FLOTATION, IN NO CASE SHOULD THE PIPE OF 1.5 FEET DEPTH, 4 FEET TOP WITH, AND 3:1 SIDE SLOPES.
ENOUGH TO EXTEND DOWN THE SLOPE AND EXIT ONTO TABLE GROUND. THE WIDTH OF THE EFFICIENCY. CONDUIT BE INSTALLED BY CUTTING A TRENCH THROUGH THE DAM AFTER THE EMBANKMENT 5, ENSURE THAT ALL SLOPE DRAIN CONINECTIONS AREA WATERTIGHT.
FABRIC MUST BE ONE PIECE, NOT JOINED OR SPLICED; 07HERWISE WATER CAN GET UNDER 11. ENSURE THAT THE STONE SPILLWAY OUTLET SECTION EXTENDS DOWNSTREAM PAST THE TOE IS COMPLETE. 6. ENSURE THAT ALL FILL MATERIAL IS WELL-COMPACTED. SECURELY FASTEN THE EXPOSED
THE FABRIC. IF THE LENGTH THE FABRIC IS INSUFFICIENTFOR THE ENTIRE LENGTH OF OF THE EMBANKMENT UNTIL STABLE CONDITIONS ARE REACHED AND OUTLET VELOCITY IS 6. EMERGENCY SPILLWAY - INSTALL THE EMERGENCY SPILLWAY IN UNDISTURBED SOIL, THE SECTION OF THE DRAIN TO GROMMET'S OR STAKES SPACED NO MORE THAN 10 FEET APART.
THE SPILLWAY, MULTIPLE SECTIONS, SPANNING THE COMPLETE
TE WIDTH, MAY BE USED. THE ACCEPTABLE FOR THE RECEIVING STREAM. KEEP THE EDGES OF THE STONE OUTLET ACHIEVEMENT OF PLANNED ELEVATIONS, GRADE, DESIGN WIDTH, AND ENTRANCE AND EXIT
UPPER SECTIONS) SHOULD OVERLAP THE LOWER SECTIION(S) SO THAT WATER CANNOT SECTION FLUSH WITH THE SURROUNDING GROUND, AND SHAPE THE CENTER TO CONFINE CHANNEL SLOPES ARE CRITICAL TO THE SUCCESSFUL OPERATION OF THE EMERGENCY + 7. EXTEND THE DRAIN BEYOND THE TOE OF THE SLOPE, AND ADEQUATELY PROTECT THE
FLOW UNDER THE FABRIC. SECURE THE UPPER EDGE AND SIDES OF THE FABRIC IN A �` min l€�? OUTLET FROM EROSION.
TRENCH WITH STAPLES OR PINS. (ADAPTED FROM "A MANUAL FOR DESIGNING, INSTALLING THE OUTFLOW STREAM. SPILLWAY.
AND MAINTAINING SKIMMER SEDIMENT BASINS." FEBRUARY 1999, J.W. FAIRCLOTH 3& SON. . 12. DIRECT EMERGENCY BYPASS TO NATURAL, STABLE AREAS. LOCATE BYPASS OUTLETS SO 7. INLETS - DISCHARGE WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE Steep CUB freeboard 8. MAKE THE SETTLED, COMPACTED DACE RIDGE NO LESS THAN 1 FEET ABOVE THE TOP OF
THAT FLOW WILL NOT DAMAGE THE EMBANKMENT. DIVERSIONS WITH OUTLET PROTECTION TO DIVERT SEDIMENT-LADEN WATER TO THE UPPER ^.; _ THE PIPE AT EVERY POINT.
9. INLETS - DISCHARGE WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE END OF THE POOL AREA TO IMPROVE BASIN TRAP EFFICIENCY. or fill d ' ����P�Pd I39 9. IMMEDIATELY STABILIZE ALL DISTURBED AREAS FOLLOWING CONSTRUCTION.
TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH OUTLET PROTECTION TO DIVERT 13. STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE THE SEDIMENT POOL AND S117p1 s _
SEDIMENT-LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP DOWNSTREAM FROM THE TRAP IMMEDIATELY AFTER CONSTRUCTION. 8. INSTALL POROUS BAFFLES AS SPECIFIED ON THE DETAILS SHEET OF THESE PLANS. -N,I,^ II I Z 1j r- �JI� _ 0 I •_IA10- SLOPE DRAIN MAINTENANCE NOTES
EFFICIENCY. 14. SHOW THE DISTANCE FROM THE TOP OF THE SPILLWAY TO THE SEDIMENT CLEANOUT LEVEL 9. SAFETY - SEDIMENT BASINS MAY ATTRACT CHILDREN AND CAN BE DANGEROUS. AVOID I
10. EROSION CONTROL - CONSTRUCT THE STRUCTURE SO THAT THE DISTURBED AREA IS (ONE-HALF THE DESIGN DEPTH) ON THE PLANS AND MARK IT IN THE FIELD. STEEP SIDE SLOPES, AND FENCE AND MARK BASINS WITH WARNING SIGNS IF TRESPASSING tr_±" '� SI9 1. INSPECT THE SLOPE DRAIN AND SUPPORTING DIVERSION AFTER EVERY RAINFALL, AND NECESSARY REPAIRS.
IS LIKELY. FOLLOW ALL STATE AND LOCATE REQUIREMENTS. !I,,, {fig Clatter PROMPTLY MAKE WHEN THE PROTECTED AREA HAS BEEN
MINIMIZED. DIVERT SURFACE WATER AWAY FROM BARE AREAS. COMPLETE THE EMBANKMENT 15. INSTALL POROUS BAFFLES AS SPECIFIED IN PRACTICE STANDARDS AND SPECIFICATIONS 6.65 PERMANENTLY STABILIZED, TEMPORARY MEASURES MAY BE REMOVED, MATERIALS DISPOSED
BEFORE THE AREA IS CLEARED, STABILIZE THE EMERGENCY' SPILLWAY EMBANKMENT AND ALL OF THE NO EROSION AND SEDIMENT CONTROL PLANNING AND DESIGN MANUAL. SEDIMENT BASIN MAINTENANCE NOTES OF PROPERLY, AND ALL DISTURBED AREAS STABILIZED APPROPRIATELY.
OTHER DISTURBED AREAS ABOVE THE CREST OF THE (PRINCIPAL SPILLWAY IMMEDIATELY
AFTER CONSTRUCTION. SEDIMENT TRAP MAINTENANCE NOTES 1. INSPECT SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (ONE-HALF TYPICAL PERMANENT DIVERSION
11. INSTALL POROUS BAFFLES AS SPECIFIED ON THE DETAILS SHEET OF THESE PLANS, 1. INSPECT TEMPORARY SEDIMENT TRAPS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT INCH OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SEDIMENT AND
12. AFTER ALL THE SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE (ONE-HALF INCH OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE RESTORE THE BASIN TO ITS ORIGINAL DIMENSIONS WHEN SEDIMENT ACCUMULATES TO
SEDIMENT AND RESTORE THE TRAP TO ITS ORIGINAL DIMENSIONS WHEN SEDIMENT ONE-HALF THE DESIGN DEPTH. PLACE REMOVED SEDIMENT IN AN AREA WITH SEDIMENT NOT TO SCALE
THE STRUCTURE AND ALL THE UNSTABLE SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY. ACCUMULATES TO ONE-HALF THE HEIGHT OF THE DESIGN DEPTH OF THE TRAP, PLACE THE CONTROLS.
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SKIMMER BASIN MAINTENANCE NOTES OF HENGR GRAVEL ACINGOTHATIS MPAIREDGBATSEEDIMENOSAL AREA, AND REPLACE THE PART 2. THECKEMBANKMENTK^FOR PIPINGAANDANSETOTLEMENT. MAKE ALL DAMAGE,NECESSARY REPAIRS TEMPORARY DIVERSION DESIGN AND CONSTRUCTION NOTES
1. INSPECT SKIMMER BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (ONE-HALF INCH 2. CHECK THE STRUCTURE FOR DAMAGE FROM EROSION OR PIPING. PERIODICALLY CHECK THE IMMEDIATELY. REMOVE ALL TRASH AND OTHER DEBRIS FROM THE RISER AND POOL AREA.
OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SEDIMENT AND RESTORE DEPTH OF THE SPILLWAY TO ENSURE IT IS A MINIMUM OF 1.5 FEET BELOW THE LOW POINT 1. REMOVE AND PROPERLY DISPOSE OF ALL TREES, BRUSH, STUMPS, OR OTHER z E
THE BASIN TO ITS ORIGINAL DIMENSIONS WHEN SEDIMENT ACCUMULATES TO ONE-HALF THE OF THE EMBANKMENT. IMMEDIATELY FILL ANY SETTLEMENT OF THE EMBANKMENT TO OBJECTIONABLE MATERIAL. FILL AND COMPACT ALL DITCHES, SWALES, OR GULLIES THAT WILL U U cN 3
HEIGHT OF THE FIRST BAFFLE. PULL THE SKIMMER TO ONE SIDE SO THAT THE SEDIMENT SLIGHTLY ABOVE DESIGN GRADE. ANY RIPRAP DISPLACED FROM THE SPILLWAY MUST BE LLi_j _j o O BE CROSSED TO NATURAL GROUND LEVEL OR ABOVE.
UNDERNEATH IT CAN BE EXCAVATED. EXCAVATE THE SEDIMENTREPLACED IMMEDIATELY.I FROM THE ENTIRE BASIN, \ D__ o tit
NOT JUST AROUND THE SKIMMER OR THE FIRST CELL. MAKE SURE VEGETATION GROWING IN PLACEMENT OF FILL, THE BASE OF THE RIDGE SHOULD BE DISKED BY compacted&oil 2' cn Vn
THE BOTTOM OF THE BASIN DOES NOT HOLD DOWN THE SKIMMER. _
3. AFTER ALL SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE 2. JUST BEFORE EMENT MACHINERY. s min r o o
THE STRUCTURE AND ALL UNSTABLE SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE I I U U Q d
2. REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE-ANCHOR THE BAFFLES IF WATER IS ADJOINING AREAS, AND STABILIZE PROPERLY. 3. EXCAVATE, SHAPE, AND STABILIZE THE DIVERSION TO LINE, GRADE, AND CROSS SECTION. Eta" : 'o
FLOWING UNDERNEATH OR AROUND THEM. 4. COMPACT THE RIDGE TO PREVENT UNEQUAL SETTLEMENT, AND TO PROVIDE STABILITY :� If3 min � �� z �
3. IF THE SKIMMER IS CLOGGED WITH TRASH OR THERE IS WATER IN THE BASIN, USUALLY AGAINST SEEPAGE. =�Illi jII IIIII�iII •II� -'! o o
=1 ITi II- - (i =J - =tl i w .. W U O
JERKING ON THE ROPE WILL MAKE THE SKIMMER BOB UP AND DOWN AND DISLODGE THE 5. VEGETATIVELY STABIDIZE THE DIVERSION AFTER ITS INSTALLATION. .L
DEBRIS AND RESTORE FLOW. IF THIS DOES NOT WORK, PULL THE SKIMMER OVER TO THE $ hPicltl }` U - U Li _j z
SIDE OF THE BASIN AND REMOVE THE DEBRIS. ALSO CHECK THE ORIFICE INSIDE THE PERMANENT DIVERSION(MAINTENANCE NOTES LJ Q Li l- U O W
FERure 6.E9sTumparary earfign tSversion;like„ W of = Q U cl� -j
SKIMMER TO SEE IF IT IS CLOGGED; IF SO, REMOVE THE DEBRIS, 1. INSPECT PERMANENT DIVERSIONS AFTER EVERY RAINFALL DURING THE CONSTRUCTION o o U o V� L_ W
4. IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE REMOVED AND OPE
RATION. IMMEDIATELY REMOVE ANY OBSTRUCTIONS FROM THE FLOW AREA, AND REPAIR Gtaarsagrgate
THE OBSTRUCTION CLEARED WITH A PLUMBER'S SNAKE OR BY FLUSHING WITH WATER. BE THE DIVERSION RIDGE. CHECK OUTLETS, AND MAKE TIMELY REPAIRS AS NEEDED. MAINTAIN T
SURE AND REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER. THE VEGETATION IN .A VIGOROUS, HEALTHY CONDITION AT ALL TIMES.
5. CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED REPAIRS WITH tRntn vy
FABRIC THAT SPANS THE FULL WIDTH OF THE SPILLWAY. CHECK THE EMBANKMENT,
SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, AND INSPECT THE EMBANKMENT FOR PIPING
OR SETTLEMENT. MAKE ALL NECESSARY REPAIR IMMEDIATELY. REMOVE ALL TRASH AND
OTHER DEBRIS FROM THE SKIMMER AND POOL AREAS. 1 PIT ----- 9'tyjowal --► I -
6. FREEZING WEATHER CAN RESULT IN ICE FORMING IN THE BASIN. SOME SPECIAL
PRECAUTIONS SHOULD BE TAKEN IN THE WINTER TO PREVENT THE SKIMMER FROM
plgyrw f"s,2lltt TeRypprar�graw3l drveraron dlivatxvnYahr crp6NNng fmaxStiad tt�ep'yAaSWKiCI:
PLUGGING WITH ICE.
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TYPICAL TEMPORARY DIVERSION Z J
NOT TO SCALE Q 0 -1
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0,1STkLL FJIERC C R SSIP,4 EF AT AID TEMPORARY DIVERSION DESIGN AND CONSTRUCTION NOTES Z Z V �-
/ 'FLI44K TO SENCH 04"ERSEETIi,+N5 Simplll 4 TechriIcat Dtawin t J Wo = 0
1. REMOVE AND PROPERLY DISPOSE OF ALL TREES, BRUSH, STUMPS, AND OTHER N
eCl ht- OBJECTIONABLE MATERIAL. LLB J
PST POST O
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see - ; ,, iIf 2. ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS DESIGN REQUIREMENTS. Q
POST SPAC41411 = 45&)MM 'u/ �Arp'a;,) aA _ ,LL -- 3. ENSURE THAT THE TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DESIGN U �/
(iy'ICAL � - 4 IOr PROANOUTSUFFICIENT ROOM AROUND DIVERSIONS TO PERMIT MACHINE REGRADING AND Z
CLEOlURISOL iNOkSE BARRIER PM03
NATURAL STOW 'PATTERN t 4. PROVIDE SUFFICIENT ROOM AROUND DIVERSIONS TO PERMIT MACHINE REGRADING AND = ,. O
(�##DULD ASIDE) �_� � �� � � teflV . TtIHLI CLEANOUT.
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5. VEGETATE THE RIDGE IMMEDIATELY AFTER CONSTRUCTION, UNLESS IT WILL REMAIN IN PLACE Z
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t ., ,: LESS THAN 30 WORKING DAYS. Z
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20 2 E PORARY DIVERSION MAINTENANCE N T S
BERM TO BE O
TM N NO = Z
CONSTRUCTED OF EARTH + b O
1. INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINFALL. IMMEDIATELY
OR BOULDERS
REMOVE SEDIMENT FROM THE FLOW AREA AND REPAIR THE DIVERSION RIDGE. CAREFULLY '�^2 CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED. WHEN THE AREA PROTECTED IS v/
" x Z
w - PERMANENTLY STABILIZED, REMOVE THE RIDGE AND THE CHANNEL TO BLEND WITH THE
- NATURAL GROUND LEVEL AND APPROPRIATELY STABILIZE.
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�, IN_ I , i TYPICAL FLUME DETAIL o- 0
11 I Il arF� 1 Ear ENT k
sae ex NOT TO SCALE
TYPICAL SCREENING BERM DETAIL ; �' ; CA "'IF
TYPICAL HIGHWALL BERM DETAIL L',_j l�cl r FOOT MG 4-J, v y , , ;,q,q0
NOT TO SCALE I hereby certify that this document was �� ,
FLUME NOTES prepared by me or under my direct personal
NOT TO SCALE TYPICAL SCREENING (SOUND) WALL DETAIL 1. UPON PLACEMENT OF MATERIAL AND FINALIZATION OF SLOPE, ENSURE ALL OBSTRUCTIONS supervision and is correct to the best of my ,•` ;# � s�Q�;• ��':
ARE REMOVED FROM THE FLUME CHANNEL AREA. knowledge and belief and that I am a duly
2. CONSTRUCT FLUME CHANNEL TO THE DIMENSIONS AS SHOWN ON THE DESIGN DETAILS. THE license Pr fe sional Engineer under the = SEAL SHEET NUMBER
NOT TO SCALE CONSTRUCTED CHANNEL SHALL BE FREE FLOWING WITH LOW SPOTS NOT TO EXCEED 0.2 laws t t t f orth Carolina. _ 048820
FEET IN DEPTH. '.
3. INSPECT FLUME CHANNEL INLET AND OUTLET POINT REGULARLY AND AFTER STORM EVENTS. ��i'�*+•'' 'Cx11+1 � ,
(Signature) �� .,,,, „ �2 ; OOG-007
Date: 3/13/2024 B. VN\`�
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