NCG021026_Doc 4_20231114

TEMPORARY/PERMANENT SKIMMER BASIN CONSTRUCTION SPECIFICATION SITE WORK NOTES:
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6' W1 E.S. FABRIC GRASS SPECIFICATION 1. THE CONTRACTOR SHALL VISIT THE SITE TO BECOME FAMILIAR WITH FIELD
8' W/ WIRE MESH CONSTRUCTION CONDITIONS,
1. CLEAR, GRUB, AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION 2. CONTRACTOR SHALL COORDINATE WORK WITHIN NCDOT AND LOCAL RIGHT
STEEL POST 1. CHISEL COMPACTED AREAS AND SPREAD TOPSOIL 3 INCHES DEEP OVER AND ROOT MAT, REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS OF ORGANIC OF WAYS WITH PROPER AUTHORITIES AND SHALL MEET ANY REQUIREMENTS
WIRE MESH FOR STANDARD FABRIC ADVERSE SOIL CONDITIONS. SKIMMER NOTE: MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY. HAUL ALL OBJECTIONABLE AS TO TRAFFIC CONTROL AND CONNECTION TO EXISTING STREETS.
2. RIP THE ENTIRE AREA TO A 6 INCH DEPTH. SKIMMER MUST FLOAT ON TOP OF MATERIAL TO THE DESIGNATED DISPOSAL AREA. PLACE TEMPORARY SEDIMENT 3. CLEARING AND GRUBBING: REMOVE ALL TREES AS (REQUIRED UNLESS
MIN. 14 GA. o x z U STANDARD OR EXTRA STRENGTH 3. REMOVE ALL ROCKS, ROOTS AND OTHER OBSTRUCTIONS LEAVING SURFACES WATER TO WORK PROPERLY. CONTROL MEASURES BELOW BASIN BS NEEDED. OTHERWISE NOTED TO REMAIN, STUMPS, ROOTS, SHRUBBERY, ASPHALT,
I `I i w FILTER FABRIC SMOOTH AND UNIFORM. CONTRACTOR SHALL VERIFY THAT SENT OPENING FOR 2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS WOODY
6x6 MESH FOR N w WATER ENTRY CONCRETE, STRUCTURES, BURIED UTILITIES, STORAGE TANKS ETC. WITHIN z
STANDARD FABRIC i¢ 4. APPLY AGRICULTURAL LIME AND FERTILIZER UNIFORMLY AND MIX WITH SOIL. THE BARREL LENGTH WILL ALLOW VEGETATION, ORGANIC MATTER, AND OTHER OBJECTIONABLE MATERIAL. PLACE THE FILL LIMITS OF CONSTRUCTION. O J
00 LIME: 45 LBS. PER 1000 S.F. SKIMMER TO FLOAT AT EMERGENCY IN LIFTS NOT TO EXCEED 9 INCHES, AND MACHINE COMPACT IT. OVER FILL THE
DIRECTION OF WATER FLOW 4. STRIPPING: BEFORE EXCAVATING OR FILLING; REMOVE ALL TOPSOIL,
PHOSPHOROUS: 20 LBS PER 1000 S.F. SPILLWAY ELEVATION. EMBANKMENT 6 INCHES TO ALLOW FOR SETTLEMENT. n
FERTILIZER: 17 LBS. PER 1000 S.F. Q
WOOD, LEAVES, AND ANY OTHER UNSUITABLE MATERIAL. 1-
3. SHAPE THE BASIN TO THE SPECIFIED DIMENSIONS. PREVENT THE SKIMMING DEVICE 5. MUCKING: REMOVE ANY SOFT', ORGANIC SILT MATERIALS AND EXISTING Of
5. CONTINUE TILLAGE UNTIL A WELL PULVERIZED, FIRM, UNIFORM SEED BED IS FROM SETTLING INTO THE MUD BY EXCAVATING A SHALLOW PIT UNDER THE SKIMMER
ANCHOR FABRIC SKIRT BURIED CONSTRUCTION DEBRIS AS REQUIRED AND FILL TO SUBGRADE � � Z
o PREPARED 4-6 INCHES DEEP. OR PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR TIMBER. „s
I z MIN. 8" DEEP & 4" WIDE. 6. SEED ON A FRESHLY PREPARED SEED BED AND COVER SEED LIGHTLY. 4. PLACE THE BARREL TYPICALLY 4-INCH SCHEDULE 40 PVC PIPE) ON A FIRM, ELEVATIONS WITH A CLEAN SELECT-FILL COMPACTED AS SPECIFIED. p I'
( 6. DISPOSAL: CLEARED, GRUBBED, STRIPPED OR EXCAVATED SPOIL SHALL
2 - 3 LBS PER 1000 S.F. (SEE MIXTURE BELOW) SMOOTH FOUNDATION OF IMPERVIOUS SOIL. DO NOT USE PERVIOUS MATERIAL
7. MULCH IMMEDIATELY AFTER SEEDING AND ANCHOR MULCH. OPENING FOR WATER ENTRY BE REMOVED FROM SITE AND DISPOSED OF ►N ACCORDANCE WITH ALL 5;GRAIN STRAW & HAY AT 75 TO 100 LBS PER 1000 S.F. SUCH AS SAND, GRAVEL, OR CRUSHED STONE AS BAGKFfLL AROUND THE PIPE. APPLICABLE LOCAL AND STATE CODES. W 07
WOOD CHIPS AT 500 LBS. PER 1000 S.F. PLACE THE FILL MATERIAL AROUND THE PIPE SPILLWAY IN 4-INCH LAYERS AND 7, BORROW MATERIAL: THE CONTRACTOR SHALL FURNISH BORROW €Y cj:�JUTE & MESH AS PER MANUFACTURER FLOAT COMPACT IT UNDER AND AROUND THE PIPE TO AT LEAST THE SAME DENSITY AS THE MATERIAL REQUIRED FROM OFF SITE AND OBTAIN ALL REQUIRED PERMITS '��k
NOTES: FLEXIBLE JOINT ADJACENT EMBANKMENT. CARE MUST BE TAKEN NOT TO RASE THE PIPE FROM THE ASSOCIATED WITH BORROW OPERATIONS, O
8. ASPHALT FOR ANCHORING MULCH SHALL BE TYPE 5S-1 EMULSION AND
1. SYN. FENCE FABRIC SHALL BE -MIN. OF 30" IN WIDTH FIRM CON!!ACT WITH ITS FOUNDATION WHEN COMPACTING UNDER THE PIPE HAUNCHES. g, FILL AND COMPACTION: AFTER STRIPPING THOSE AREAS DESIGNATED TO �APPLIED AT A RATE OF 1000 GAL. PER ACRE FOR SLOPE STABILIZATION,
WITH 30 LB/IN
TENSILE STRENGTH FOR STANDARD FABRIC AND 150 GAL. PER TON OF STRAW FOR ANCHORING STRAW. BARREL PIPE RECEIVE FILL SHOULD BE PROOFROLLED. THE TOP 8" OF SUBGRADE SHALL w
AND 50 LB IN FOR EXTRA STRENGTH. REFER TO TABLE FOR REQUIRED LENGTH. PLACE A (MINIMUM DEPTH OF 2 FEET OF COMPACTED BAGKFILL OVER THE PIPE BE COMPACTED TO AT LEAST 98% OF MAXIMUM DENSITY AT OPTIMUM Q Q
/ 9. INSPECT ALL SEEDED AREAS AND MAKE NECESSARY REPAIRS OR RESEED SPILLWAY BEFORE CROSSING IT WITH CONSTRUCTION EQUIPMENT. IN NO CASE
2, FABRIC SHALL BE CONTINUOUS LENGTH. IF JOINTS ARE WITHIN THE PLANTING SEASON, IF POSSIBLE. IF GRASS STAND SHOULD BE MOISTURE CONTENT. ANY AREA WHICH PUMPS OR RUTS EXCESSIVELY
AFTER THE EMBANKMENT IS COMPLETE. N
NECESSARY, LAP FABRIC POST TO POST. OVER 60% DAMAGED, REESTABLISH FOLLOWING ORIGINAL LIME, FERTILIZER SHOULD THE PIPE CONDUIT BE COMPLETE.
INSTALLED BY CUTTING A TRENCH THROUGH THE DAM SHOULD BE UNDERCUT AND REPLACED WITH A CLEAN, SILTY OR CLAYEY U
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3, STEEL POST SHALL BE MIN 4' IN HEIGHT AND BE OF THE AND SEEDING RATES. SAN,, HAVING A UNIFIED SOIL CLASSIFICATION OF SP, SM, OR SG. FILL
SELF-FASTENER STEEL ANGLE TYPE. 10. CONSULT CONSERVATION INSPECTOR ON MAINTENANCE, TREATMENT, AND 5. ASSEMBLE THE SKIMMER FOLLOWING THE MANUFACTURER INSTRUCTIONS, OR MATERIAL 5" OUTSIDE OF BUILDING AREAS SHALL THEN BE PLACED IN Z
FERTILIZATION AFTER PERMANENT COVER IS ESTABLISHED. OUTLET END AS DESIGNED. p
6. LAY THE ASSEMBLED SKIMMER ON THE BOTTOM OF THE BASIN WITH THE LAYERS NOT TO EXCEED 8" AND COMPACTED TO AT LEAST 95% OF THE m TEMPORARY P( RAR ,SILT FENCE 11. SEED FOR TEMPORARY AND PERMANENT APPLICATIONS SHALL BE: CONNECT TO OUTLET FLEXIBLE JOINT AT THE INLET OF THE BARREL PIPE. ATTACH THE FLEXIBLE JOINT TO STANDARD PROCTOR MAXIMUM DRY DENSITY (ASTM D-6198) WITH THE W
-- -- --- - 20% CARPET GRASS PIPE OR RISER. }�
N-T J 24% BERMUDA GRASS REFER TO TABLE FOR THE BARREL PIPE AND POSITION THE SKIMMER OVER THE EXCAVATED PIT OR UPPER 12 INCHES OF SUBGRADE BEING COMPACTED TO 98% OF THE >_
10% SUPPORT. BE SURE TO ATTACH A ROPE TO THE SKIMMER AND ANCHOR IT TO THE STANDARD
DAPROS TOO A MAXIMUM
DRY DS DEDENSITY.
BUILDING AREAS ALL WITHIN
BE
24% TURF FESCUE GRAIN
CREEPING RED FESCUE REQUIRED) DIAMETER SIDE OF THE BASIN. THIS WILL BE USED TO PULL THE SKIMMER TO THE SIDE FOR ....
2UD ANNUAL RYE GRAIN
*BERMUDA SEED SHALL BE HULLED FOR WARM WEATHER MAINTENANCE. PLACED IN LAYERS NOT TO EXCEED 8" AND COMPACTED TO AT LEAST 987.
7, EARTHEN SPILLWAYS---INSTALL THE SPILLWAY IN UNDISTURBED SOIL TO THE OF THE STANDARD PROCTOR MAXIMUM DRY DENSITY ASTM D-698 WITH 0
PLANTING. PURITY OF' SEED SHALL BE A MIN. OF 98% AND ( )
GERMINATION SHALL BE A MIN. OF 85%. GREATEST EXTENT POSSIBLE. THE ACHIEVEMENT OF PLANNED ELEVATIONS, GRADE, THE UPPER 12 INCHES OF SUBGRADE BEING COMPACTED IN 6 INCH Z
DESIGN WIDTH, AND ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE LAYERS TO 100% OF THE STANDARD PROCTOR MAXIMUM DRY DENSITY, IN
ALL DISTURBED AREA SHALL BE SEEDED WITHIN 15 DAYS OF THE COMPLETION OF STANDARD SKIMMER DETAIL FAIRL T SUCCESSFUL OPERATION OF THE SPILLWAY. THE SPILLWAY SHOULD BE LINED AREAS WHERE NO STRUCTURAL FILL IS TO BE PLACED THE UPPER 12
GRADING. CONSULT CONSERVATION ENGINEER OR SOIL CONSERVATION SERVICE FOR WITH LAMINATED PLASTIC OR IMPERMEABLE GEOTEXTILE FABRIC. THE FABRIC MUST BE INCHES OF IN-PLACE SUBGRADE SHOULD BE COMPACTED TO AT LEAST 98%
ADDITIONAL INFORMATION CONCERNING OTHER ALTERNATIVES FOR VEGETATION OF N.T,S. WIDE AND LONG ENOUGH TO COVER THE BOTTOM AND SIDES AND EXTEND ONTO THE OF THE STANDARD PROCTOR MAXIMUM DRY DENSITY. IF THE MATERIAL IS
DENUDED AREAS. THE ABOVE VEGETATION RATES ARE THOSE WHICH DO WELL TOP OF THE DAM FOR ANCHORING IN A TRENCH. THE EDGES MAY BE SECURED WITH TOO DRY TO COMPACT TO THE REQUIRED DENSITY EACH LAYER SHALL BE
UNDER LOCAL CONDITIONS, OTHER SEEDING SCHEDULES MAY BE POSSIBLE, 8-INCH STAPLES OR PINS. THE FABRIC MUST BE LONG ENOUGH TO EXTEND DOWN WETTED IN ACCORDANCE WITH COMPACTION REQUIREMENTS. IF THE MATERIAL
THE SLOPE AND EXIT ONTO STABLE GROUND. THE WIDTH OF THE FABRIC MUST BE IS T00 WET TO SECURE PROPER COMPACTION, IT SHALL BE HARROWED NNW
Lu Z U
ONE PIECE, NOT JOINED OR SPLICED; OTHERWISE WATER CAN GET UNDER THE REPEATEDLY OR OTHERWISE AERATED WITH SUITABLE EQUIPMENT UNTIL Q Z W z
FABRIC. IF THE LENGTH OF THE FABRIC IS INSUFFICIENT FOR THE ENTIRE LENGTH OF OPTIMUM MOISTURE CONTENT IS OBTAINED. FILL SHALL BE PLACED IN SUCH
THE SPILLWAY, MULTIPLE SECTIONS, SPANNING THE COMPLETE WIDTH, MAY BE USED. A MANNER THAT THE SURFACE WILL DRAIN READILY AT ALL TIMES. SEE ~ Z
NPDES STABILIZATION TIMEFRAMES TOP TOP THE UPPER SECTION(S) SHOULD OVERLAP THE LOWER SECTION(S) SO THAT WATER STRUCTURAL NOTES AND SOILS REPORT FOR ADDITIONAL REQUIREMENTS. L u W rmr� m
- CANNOT FLOW UNDER THE FABRIC. SECURE THE UPPER EDGE AND SIDES OF THE 9• LAYOUT: THE CONTRACTOR SHALL PROVIDE ALL LAYOUT REQUIRED TO � V Im
SITE AREA DESCRIPTION STABILIZATION TIMEFRAME EXCEPTIONS - FABRIC IN A TRENCH WITH STAPLES OR PINS. (ADAPTED FROM "A MANUAL FOR CONSTRUCT HIS WORK.
OpQ DESIGNING, INSTALLING AND MAINTAINING SKIMMER SEDIMENT BASINS." FEBRUARY, 10. THE CONTRACTOR ►S RESPONSIBLE FOR THE LOCATIION AND PROTECTION
PERIMETER DIKES, SWALES, PITCHES AND SLOPES 7 DAYS NONE - - ( OF EXISTING UTILITIES DURING CQNSTRUGTION.
BO�i 0M 1999. 1. W. FAIRGLOTH & SON.).
I INLETS-DISCHARGE EXISTING BOUNDARY INFORMATION BY GIS & AERIAL PHOTOGRAPHY AND
HIGH QUALITY WATER (HQW) ZONES 7 DAYS NONE 1 3 ___ I� 3 USE ITEMPORDARY SL OPE DRTAINSINOR D VERSIONS (WITH OUTLET POTEClONN A MANNER TO T 0 DSVERT PROVIDED BY OWNER.
IF SLOPES ARE 10' OR LESS IN LENGTH AND ARE NOT ° ' ' ' ' ' ' ' 12. THE CONTRACTOR SHALL VERIFY DIMENSIONS AT JO BSITE.
M
�0' SLOPES STEEPER THAN 3:1 7 DAYS SEDIMENT LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN a
STEEPER THAN 2:1, 14 DAYS ARE ALLOWED TRAP EFFICIENCY {REFERENCES: RUNOFF CONTROL MEASURES AND OUTLET 13. THE CONTRACTOR IS RESPONSIBLE FOR THE COORDINATION OF AN ----- RELOCATION OR DISCONNECTION OF ALL EXISTING UTILITIES WITH a
SLOPES 3:1 OR FLATTER 14 DAYS 7 DAYS FOR SLOPES GREATER THAN 50' IN LENGTH PROTECTION. ui
APPLICABLE AGENCIES AND AUTHORITIES. cu
ALL OTHER AREAS WITH SLOPES FLAT ER THAN 4:1 14 DAYS NONE, EXCEPT FOR PERIMETERS AND HQW ZONES SEI E T SI SECTION g. EROSION CONTROL-CONSTRUCT THE STRUCTURE SO THAT THE DISTURBED AREA 14. ALL PAVEMENT AND BASE MATERIALS AND WORKMANSHIP SHALL
N.T.S. IS MINIMIZED. DIVERT SURFACE WATER AWAY FROM BARE AREAS. COMPLETE THE CONFORM TO NCDOT STANDARDS. A�
J 15. ALL AREAS SHALL BE GRADED FOR POSITIVE DRAINAGE, 0 'LI
EMBANKMENT BEFORE THE AREA IS CLEARED. STABILIZE THE EMERGENCY SPILLWAY 16. CONTRACTOR SHALL NOTE THAT EARTHWORK QUANTITIES ARE HIS s4 Cd
EMBANKMENT AND ALL OTHER DISTURBED AREAS ABOVE THE CREST OF THE RESPONSIBILITY. PLANS DO NOT REPRESENT A BALANCED EARTHWORK (�0, "
PRINCIPAL SPILLWAY IMMEDIATELY AFTER CONSTRUCTION (REFERENCES: SURFACE CONDITION.
STABILIZATION).
10. INSTALL POROUS BAFFLES AS SPECIFIED IN PRACTICE 6,65, POROUS BAFFLES. U
6" MIN. GENERAL NOTES: CLASS A STONE 11, AFTER ALL THE SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY EROSION CONTROL NOTES AN MAINTENANCE U
STABILIZED, REMOVE THE STRUCTURE AND ALL THE UNSTABLE SEDIMENT,
D N NCE PLAN a b a
2 3" �y DETERMINE BORROW PIT DEWATERING BASIN SIZE USING SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY 1. ALL EROSION AND SEDIMENT CONTROL MEASURES WILL BE CHECKED FOR w
COARSE AGGREGATE �r V = 8.0203 * Q * T, WHERE V IS VOLUME (Fr), Q IS FILTRATION STABILITY AND OPERATION FOLLOWING EVERY RUNOFF-PRODUCING RAINFALL, Z
GEOTEXTILE (REFEREN(ES: SURFACE STABILIZATION). BUT IN NO CASE, LESS THAN ONCE EVERY WEEK AND WITHIN 24 HOURS OF
PUMP FLOW RATE (GPM), AND 7 IS DEWATERING TIME (HR). a USE MAXIMUM FLOW RATE OF 1000 GPM AND A MINIMUM MAINTENANCE 2.ER ALL POINTS OF RAINFALL.
EGRESS WILL HAVE CONSTRUCTION ENTRANCES THAT WILL
®
DEWATERING TIME OF 2 HOURS.
TEMPO BE PERIODICALLY TOP-DRESSED WITH AN ADDITIONAL 2 INCHES OF #4 STONE
TEMPORARY GRAVEL r STONE ENERGY INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT TO MAINTAIN PROPER DEPTH. THEY WILL BE MAINTAINED IN A CONDITION TO
RISER SHALL BE A NON-PERFORATED, SMOOTH OR CORRUGATED Ii€= STEEL POST DISSIPATER _
CONSTRUCTION ENTRANCE MATERIAL WITH A FLASHBOARD OPTION. '"' ROEMOVEALF INCH S;EDIM NTOANDRR STORE THIEFALL BASIN TOEVENT
ITS ORIGINAL( DIMNSIONSLY. PREVENT MUD WHEN OBJECTIONABLE OMATERIAL SEDIMENT
SPILLED WASHED OR TRACKED MONTOATTHE REMOVE
CONSTRUCT THE COIR FIBER BAFFLE IN ACCORDANCE WITH ROADWAY 'M SEDIMENT ACCUMULATES TO ONE-HALF THE HEIGHT OF THE FIRST BAFFLE. PULL CONSTRUCTION ENTRANCE OR ROADWAYS.
NTS STANDARD DRAWING 1640,01 AND WITH MATERIAL THAT MEETS THE / THE SKIMMER TO ONE SIDE 80 THAT THE SEDIMENT UNDERNEATH IT CAN BE 3. DIVERSION DITCHES WILL BE CLEANED OUT IMMEDIATELY TO REMOVE
SPECIFICATIONS OF ROADWAY STANDARD 1060-14. ` EXCAVATED. EXCAVATE THE SEDIMENT FROM THE ENTIRE BASIN, NOT JUST AROUND SEDIMENT OR OBSTRUCTIONS FROM THE FLOW AREA. THE DIVERSION RIDGES
F;
THE SKIMIMER OR THE FIRST CELL. MAKE SURE VEGETATION GROWING IN THE BOTTOM WILL ALSO BE REPAIRED. SWALES MUST BE TEMPORARILY STABILIZED WITHIN
PROVIDE 5' STEEL POST OF THE SELF-FASTENER ANGLE STEEL TYPE. ¢ OF THE BASINDOES NOT HOLD DOWN THE SKIMMER. 21 CALENDAR DAYS OF CEASE OF ANY PHASE OF ACTIVITY ASSOCIATED WITH A
INSTALL STEEL POSTS WITH NO MORE THAN 3' OF THE POST APPEARING SWALE.
ABOVE THE GROUND, ®, REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE-ANCHOR THE BAFFLES IF WATER 4. SEDIMENT WILL BE REMOVED FROM BEHIND THE SEDIMENT FENCE WHEN
1/`4 L IS FLOWING UNDERNEATH OR AROUND THEM. IT BECOMES HALF FILLED. THE SEDIMENT FENCE WILL BE REPAIRED AS
ATTACH THE COIR FIBER MAT TO THE STEEL POSTS WITH WIRE OR „ „ , NECESSARY TO MAINTAIN A BARRIER. STAKES MUST BE STEEL. STAKE N
OTHER ACCEPTABLE MEANS AND STAPLED INTO THE BOTTOM AND SIDE =2 W MIN. ISER IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE IS WATER IN THE BASIN, SPACING WILL BE 6 FEET MAX. WITH THE USE OF EXTRA STRENGTH FABRIC, ,
SLOPES OF THE BASIN WITH 12" STAPLES. USUALLY JERKING ON THE ROPE WILL MAKE THE SKIMMER BOB UP AND DOWN AND WITHOUT WIRE BACKING. STAKE SPACING WILL BE 8 FEET MAX. WHEN N t
DISLODGE THE DEBRIS AND RESTORE FLOW. IF THIS DOES NOT WORK, PULL THE STANDARD STRENGTH FABRIC AND WIRE BACKING ARE USED. IF ROCK FILTERS U N
INSTALL TYPE 2 GEOTEXTILE ON SIDE SLOPES AND BOTTOM OF BASIN AT SKIMMER OVER TO THE SIDE OF THE BASIN AND REMOVE THE DEBRIS. ALSO CHECK ARE DESIGNED AT LOW POINTS IN THE SEDIMENT FENCE, THE ROCK WILL BE
INLET AS SHOWN IN THE DETAIL. THE ORIFICE INSIDE THE SKIMMER TO SEE IF IT IS CLOGGED; IF SO REMOVE THE REPAIRED OR REPLACED IF IT BECOMES HALF-FULL OF SEDIMENT, NO LONGER (� W
DEBRIS. DRAINS AS DESIGNED OR IS DAMAGED. y
USE THE TYPICAL SECTION SHOWN FOR THE BORROW PIT DEWATERING 5. ALL SEEDED AREAS WILL BE FERTILIZED, RESEEDED( AS NECESSARY, AND
BASIN AS A GUIDE. THE BASIN MAY HAVE ANY TYPE CONFIGURATION AS EARTH DIKE IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE REMOVED MULCHED, ACCORDING TO SPECIFICATIONS IN THE VEGETATIVE PLAN, TO (� W
LONG AS SUFFICIENT VOLUME IS PROVIDED AND PROVISIONS ARE MADE AND THE OBSTRUCTION CLEARED WITH A PLUMBER'S SNAKE OR BY-FLUSHING WITH MAINTAIN A VIGOROUS, DENSE VEGETATIVE COVER. ALL SLOPES WILL BE
FOR A NON-PERFORATED RISER, FLAN WATER. BIE SURE AND REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER. STABILIZED WITHIN 21 CALENDAR DAYS. ALL OTHER AREAS WILL BE STABILIZED
WITHIN 15 WORKING DAYS. : WATER QUALITY REQUIRES ALL SEEDED AREAS a
DO NO EXCEED 3.5 FT. IN HEIGHT FOR THE EARTH DIKES REQUIRED FOR CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED WILL BE FERTILIZED, RESEEDED AS NECESSARY AND MULCHED ACCORDING TO
TOP BANK ELEV. BORROW PIT DEWATERING BASIN. REPAIRS WITH FABRIC THAT SPANS THE FULL WIDTH OF THE SPILLWAY. CHECK THE SPECIFICATIONS IN THE VEGETATIVE PLAN TO MAINTAIN A VIGOROUS, DENSE
VARIES FROM 38' TO 30' EMBANKMENT, SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, AND INSPECT THE VEGETATIVE COVER. ALL PERIMETER DIKES, SWALES, HORIZONTAL TO 'DITCHES, �
THE BORROW PIT DEWATERING BASIN SIZE IS VARIABLE AND DEPENDENT EMBANKMENT FOR PIPING AND SETTLEMENT. MAKE ALL NECESSARY REPAIRS PERIMETER SLOPES, ALL SLOPES STEEPER THAN 3 VERTICAL (3:1) AND ALL rti.1
ON SPECIFIC SITE REQUIREMENTS AS WELL AS PROPOSED CONSTRUCTION QUALITY WATER (HQW) ZONES SHALL BE ' 1 PROVIDED TEMPORARY OR
OPERATIONS. -� �.._ e IMMEDIATELY. REMOVE ALL TRASH AND OTHER DEBRIS FROM THE SKIMMER AND HIGH:
-- I r 1•d f 1.0 POOL AREAS. PERMANENT STABILIZATION WITH GROUND COVER AS SOON AS PRACTICABLE BUT
MINE RECLAMATION 1�®_ NFINAL NORMAL WATER ELEVATION SUBMIT THE SIZE, LOCATION AND RISER PIPE MATERIAL FOR APPROVAL 1 IN ANY EVENT WITHIN SEVEN (7) CALENDAR DAYS FROM THE LAST
BACKSLOPE 3 AVERAGE 1 FREEZING WEATHER CAN RESULT IN ICE FORMING IN THE BASIN. SOME SPECIAL LAND-DISTURBING ACTIVITY. ALL OTHER DISTURBED H o
PRIOR TO CONSTRUCTION. 1 1 AREAS SHALL BE PROVIDED
DEPTH = 25' � PRECAUTIONS SHOULD BE TAKEN IN THE WINTER TO PREVENT THE SKIMMER FROM TEMPORARY OR PERMANENT STABILIZATION WITH GROUND COVER AS SOON AS �
PUMP THE EFFLUENT INTO THE BORROW PIT DEWATERING BASIN TO A PLUGGING WITH ICE. PRACTICABLE BUT IN ANY EVENT WITHIN FOURTEEN (14) CALENDAR DAYS FROM
1 2 MAXIMUM DEPTH OF 6 IN. BELOW TOP OF THE EARTH DIKE. UNCLASSIFIED THE LAST LAND-DISTURBING ACTIVITY. ��..� D
BOTTOM ELEV. VARIES EARTH MATERIAL STEEL POSTS ANTI-SEEP 6. FLOCCULANTS WILL BE USED TO ADDRESS TURBIDITY ISSUES. THE H cn
N
PROVIDE A STONE ENERGY DISSIPATER PAD AT THE OUTLET OF THE PUMPS, TANKS, HOSES AND INJECT SYSTEMS WILL BE CHECKED FOR wj
Ln
PUMP DISCHARGE HOSE AND OUTLET OF THE RISER BARREL IN PROBLEMS OR TURBID DISCHARGES DAILY. Q U �
ACCORDANCE WITH ROADWAY STANDARD DRAWING 876.02 FOR OUTLET VARIABLE c!� Z ,
C FILTER M
MINE SLOPE & RECLAMATION CROSS SECTION W/O DITCH. BAFFLE z
NTS TYPICAL SECTION VIEW C7 O o
BAFFLE CONSTRUCTION SPECIFICATION J z
NOTES:
1. DEPTH of MINE WILL BE DICTATED BY SUITABLE MATERIAL. FIRST CHAMBER SECOND CHAMBER OUTLET ZONE 1. GRADE THE BASIN SO THAT THE BOTTOM IS LEVEL FRONT TO BACK AND SIDE 6 O
2. AT RECLAMATION ALL BANKS ABOVE NORMAL WATER WILL BEBORROW PIT DEWATERING BASIN INLET ZONE 25° OF SURFACE 25% OF SURFACE AREASIDE. CN
SLOPED & GRADED AT 4:1 & STABILIZED WITH GRASSING. DETAIL 25% OF SURFACE 25% OF SURFACE AREA o
2. INSTALL POSTS OR SAW HORSES ACROSS THE WIDTH OF THE SEDIMENT TRAP P'
AREA (PRACTICE 6.62, SEDIMENT FENCE).
3. STEEL POSTS SHOULD BE DRIVEN TO A DEPTH OF 24 INCHES, SPACED A
MIN, 20" MAXIMUM OF 4 FEET APART, AND INSTALLED UP THE SIDES OF THE BASIN AS WELL.
THE TOP OF THE FABRIC SHOULD BE 6 INCHES HIGHER THAN THE INVERT OF THE
SPILLWAY. TOPS OF BAFFLES SHOULD BE 2 INCHES LOWER THAN THE TOP OF THE
EXTEND 9 GAUGE TO 5' CREST WIDTH BERMS.
COMPACTED SOIL BASIN SIDE OR INSTALL / OUTLET STRUCTURE
ROADWAY T-POST TO ANCHOR SEE DETAIL 4. INSTALL AT LEAST THREE ROWS OF BAFFLES BETWEEN( THE INLET AND OUTLET
BAFFLE TO SIDE OF DISCHARGE POINT. BASINS LESS THAN 20 FEET IN LENGTH MAY USE 2 BAFFLES.
_ DRAPE BAFFLE MATERIAL OVER WIRE BASIN AND SECURE TO SD PIPE CONTINUES
-- - INFLOW
STRAND AND SECURE WITH PLASTIC TIES VERTICAL POST � cu a) TO OUTLET LOCATION 5, WHEN USING POSTS, ADD A SUPPORT WIRE OR ROPE ACROSS THE TOP OF THE I.licence#C-3641
AT POSTS AND ON WIRE EVERY 12" -* 4' MAX. STRUCTUREan > > s> MEASURE TO PREVENT SAGGING.
I r- m 6. WRAP POROUS MATERIAL, LIKE JUTE BACKED BY COIR MATERIAL, OVER A 19016
HAUL ROAD SECTION SAWHORSE OR THE TOP WIRE. HAMMER REBAR INTO THE 'SAWHORSE LEGS FOR
NTS � -I VARIABLE DEPTH RIPRAP OR ANCHORING. THE FABRIC SHOULD HAVE FIVE TO TEN PERCENT OPENINGS IN THE DES. JKB
9 GAUGE MIN. HIGH 3 MIN. SLOPE DRAIN WEAVE. ATTACH FABRIC TO A ROPE AND A SUPPORT STRUCTURE WITH ZIP TIES,
TENSION WIRE STRAND I WIRE, OR STAPLES. CKD. ,JPN
SHALL POST
SECURED TO SUPPORT - 7. THE BOTTOM AND SIDES OF THE FABRIC SHOULD BE ANCHORED IN A TRENCH IRWN• ZAC
SHALL
=;; =; = �- SECURE BOTTOM OF BAFFLE TO
BAFFLE MATERIAL - __ GROUND WITH 12" STAPLES AT EARTHEN EMBANKMENT OR PINNED WITH 8-INCH EROSION CONTROL MATTING STAPLES.
BAFFLE MATERIAL- 12" MAXIMUM SPACING WITH STABILIZED SIDE SKIMMER SEE DETAIL
SLOPES CONNECT SKIMMER TO 8. DO NOT SPLICE THE FABRIC, BUT USE A CONTINUOUS PIECE ACROSS THE BASIN. DATE 11/02/23
BAFFLE MATERIAL OUTLET ORIFICE.
NOTES: IF THE TEMPORARY SEDIMENT REMOVE SKIMMER AND MAINTENANCE . cl,
0 ttatt
RETURN BASIN AND ®'s C'` ®®r
1. MINING TO COMMENCE ON AN AS NEEDED BASIS, BASIN WILL BE CONVERTED TO A 11 GAUGE OUTLET STRUCTURE TO
INSPECT BAFFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY
2. RECLAMATION IS REQUIRED PRIOR TO MINE CLOSE OUT. PERMANENT STORMWATER BASIN LANDSCAPING STORMWATER DESIGN REQUIRED REPAIRS IMMEDIATELY. ` 2
3, NO PERMANENT STRUCTURES OR PERMANENT EMPLOYEES ARE OF GREATER DEPTH, THE BAFFLE STAPLE EMERGENCY CONDITIONS C�
PROPOSED ON SITE. HEIGHT SHOULD BE BASED ON _ _ SPILLWAY CONSTRUCTION BE SURE TO MAINTAIN ACCESS TO THE BAFFLES. SHOULD THE FABRIC OF A BAFFLE E �"
4. THE HOURS OF OPERATION WILL BE MONDAY THRU FRIDAY FROM 7:30 THE POOL DEPTH DURING USE AS - - - COMPLETION. COLLAPSE, "TEAR, DECOMPOSE, OR BECOME INEFFECTIVE, REPLACE IT PROMPTLY. O 1C2O
AM TO 5:00 PM. A TEMPORARY SEDIMENT BASIN. I I=I I= ( III ®�
5. BUFFERS SHALL BE NATURAL VEGETATION( SUPPLEMENTED WITH REMOVE SEDIMENT DEPOSITS WHEN IT REACHES HALF FULL TO PROVIDE ADEQUATE .'® '�,N ►NE�.,:'t�Q„•
NECESPLANTINGS SARYT 0 MEET REQUIREMENTS. NOTE: INSTALL THREE (3) COIR FIBER BAFFLES ACROUS CROSS THE BAFFLES
BASIN TO REDIMENT UCE FLOW BASIN,RATES ANDW IS TURBULENICBE DISTRIBUTED
RESULTING BAF EVENLY FLES. TAKEAGE CARETO THE
AVOIDNEXT
DAMAGI DAMAGING AND
THEBAFFLES DURINGUCE PRESSURE
CLEANOUT. ®""Oof�PH FC`IN BASKS AT DRAINAGE OUTLETS WITH A ®®ttette!"''wto
6. A 30FT ACCESS EASEMENT SHALL BE PROVIDED FOR ALL MINES TO SPACING OF 1/4 THE BASIN LENGTH. TWO (2) IN GREATER SEDIMENT RETENTION. SEDIMENT DEPTH SHOULD NEVER EXCEED HALF THE DESIGNED STORAGE DEPTH.
ALLOW COIR FIBER BAFFLES CAN BE INSTALLED IN
ACCESS TO NEW BRITTON HWY E ALONG THE EXISTING HAUL ROAD. THE BASINS LESS THAN 20 FT. IN LENGTH AFTER THE CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED, REMOVE
7. MINE OPERATOR SHALL USE A WATER TRUCK TO CONTROL DUST ALONG WITH A SPACING OF 1/3 THE BASIN LENGTH. SEDIMENTBASINPOROUS BA�F �, ALL BAFFLE MATERIALS AND UNSTABLE SEDIMENT DEPOSITS, BRING THE AREA TO
THE HAUL GRADE, AND STABILIZE IT.
ROAD AS NECESSARY.
FIGURE 6.65b COIIR FIBER BAFFLE DETAIL NTS 2
CROSS SECTION OF A POROUS BAFFLE I
A SEDIMENT IN. NOTE; SEE PLAN FOR BAFFLE LOCATIONS,