SW4210704_Plansheet - Misc. Detail_20210803

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#57 WASHED STONE
CLASS I RIP RAP
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SILT FENCE
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 18 INCHES ABOVE THE GROUND SURFACE. (HIGHER FENCES MAY
IMPOUND VOLUMES OF WATER SUFFICIENT TO CAUSE FAILURE OF THE STRUCTURES.
3. CONSTRUCT THE FILTER FABRIC FROM A CONTINUOUS ROLL CUT TO THE LENGTH OF THE BARRIER TOAVOID JOINTS. WHEN JOINTS ARE
NECESSARY, SECURELY FASTEN THE FILTER CLOTH ONLY AT A SUPPORT POST WITH OVERLAP TO THE NEXT POST.
4. SUPPORT STANDARD STRENGTH FILTER FABRIC BY WIRE MESH FASTENED SECURELY TO THE UPSLOPE SIDE OF THE POSTS USING HEAVY
DUTY WIRE STAPLES AT LEAST 1 INCH LONG, OR TIE WIRES. EXTEND THE WIRE MESH SUPPORT TO THE BOTTOM OF THE TRENCH.
5. WHEN A WIRE MESH SUPPORT FENCE IS USED, SPACE POSTS A MAXIMUM OF 8 FT. APART. SUPPORT POSTS SHOULD BE DRIVEN
SECURELY INTO THE GROUND TO A MINIMUM OF 18 INCHES.
6. EXTRA STRENGTH FILTER FABRIC WITH A 6 FT. POST SPACING DOES NOT REQUIRE WIRE MESH SUPPORT FENCE. STAPLE OR WIRE THE
FABRIC DIRECTLY TO POSTS.
7. EXCAVATE A TRENCH APPROXIMATELY 4 INCHES WIDE AND 8 INCHES DEEP ALONG THE PROPOSED LINE OF POSTS AND UPSLOPE FROM
THE BARRIER.
8. BACKFILL THE TRENCH WITH COMPACTED SOIL OR GRAVEL PLACED OVER THE FILTER FABRIC.
9. 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 COLLAPSE, TEAR, DECOMPOSE OR ABECOME INEFFECTIVE, REPLACE IT PROMPTLY. REPLACE
BURLAP EVERY 60 DAYS.
REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON
FENCE. TAKE CARE TO AVOID UNDERMINING THE FENCE DURING CLEANOUT.
REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS AND BRING THE ARE TO GRADE AND STABILIZE IT AFTER THE
CONTRIBUTING DRAINAGE AREA HAS BEEN PROPERLY STABILIZED. METAL FENCE POST
NOTES: 1. TOTAL DRAINAGE AREA FLOWING .TO HOG WIRE (OPTIONAL)
SILT FENCE MAY NOT EXCEED 2 ACRES.
IN DRAINAGE AREAS OVER 1 ACRE THE
SILT FENCE SHOULD HAVE A STORAGE PIT. /-ERos1oN CONTROL FABRIC
2.SILT FENCES SHOULD NOT BE USED AT
PIPE OUTLETS OR IN AREAS OF 10
CONCENTRATED FLOW (CREEKS, DITCHLINES, 1 FILL SLOPE
SWALES, ETC.)
/� NO. 4 WASHED STONE
I FENCE °o o°°
11 I I I II III II I I I I I II 11 I i�
y -FLOW \% °o°o°o° o
II I IIIII I i l 11 I l i EARTH
95.DWG SEDIMENT PIT
cI
I
iV I
/ T
SILT
FENCE DETAIL i
NOT TO SCALE
_\ pA1,�ENT
__
.....1-- - SHOU DER
j`/
SEE INSET 'A'
ISOMETRIC VIEW
WATTLE,= o y
STAKES
MATTING BACK
SLOPE
INSET 'A'
2' (MAX.)
2' UPSLOPE STAKE
NATURAL GROUND
a?
MATTING 2' DOWNSLOPE STAKE.
CROSS SECTION
STAPLES
SEE INSET 'C' VEE DITCH
INSET 'B'
2 2' UPSLOPE STAKE
NATURAL GROUND
\
2' DOWNSLOPE STAKE
FPAM(3.5MATTING
CROSS SECTIONTRAPEZOIDAL
DITCH
WATTLE FOR EROSION CONTROL
INSET 'C'
NTS
a1a
ol.
FLOW
CLASS "A" EROSION
CONTROL STONE
f FLOW
aic �I%
NOTE: THIS DEVICE IS TYPICALLY USED 20' AWAY FROM PIPE OUTLETS. LATER TO BE
SPREAD INTO A STONE APRON. TYPICALLY USED IN DITCH LINES TO SLOW WATER,
AT OUTLETS OF BASINS AND BERMS.
No. 4 WASHED STONE
6" THICK
FLOW
DETAIL - EROSION CONTROL STONE CHECK DAM
NOT TO SCALE
ala .i.
PLAN ,'- 'I6
alc Jb, , H,
TOP bF EXIST• 211212 I,
No. 4 WASHED STONE
I'• "'-6" THICK DEPTH _
TO
CLASS "A" EROSION 'I' DITCH DEPTH
CONTROL STONE f FLOW
,1
FLOW �• PITCH
BOTTOM ELEVATION
EXCELSIOR MATTING (STANDARD AND HIGH VELOCITY)
1. APPLY LIME, FERTILIZER AND SEED BEFORE LAYING THE NET OR MAT. IF OPEN -WEAVE NETTING IS USED, LIME MAY BE INCORPORATED
BEFORE INSTALLING THE NET AND FERTILIZER AND SEED SPRAYED ON AFTERWARD.
2. START LAYING THE NET FROM THE TOP OF THE CHANNEL OR SLOPE AND UNROLL IT DOWN THE GRADE. ALLOW NETTING TO LAY LOOSELY
ON THE SOIL BUT WITHOUT WRINKLES -DO NOT STRETCH.
3. TO SECURE THE NET BURY THE UPSLOPE END IN A SLOT OR TRENCH NO LESS THAN 6 INCHES DEEP COVER WITH SOIL AND TAMP FIRMLY.
STAPLE THE NET EVERY 12 INCHES ACROSS THE TOP END AND EVERY 3 FEET AROUND THE EDGES AND BOTTOM. WHERE 2 STRIPS OF NET ARE
LAID SIDE BY SIDE, THE ADJACENT EDGES SHOULD BE OVERLAPPED 3 INCHES AND STAPLED TOGETHER. EACH STRIP OF NETTING SHOULD ALSO
BE STAPLED DOWN THE CENTER, EVERY 3 FEET. DO NOT STRETCH THE NET WHEN APPLYING STAPLES.
4. TO JOIN TWO STRIPS, CUT A TRENCH TO ANCHOR THE END OF THE NEW NET. OVERLAP END OF THE PREVIOUS ROLL 18 INCHES, AND STAPLE
EVERY 12 INCHES JUST BELOW THE ANCHOR SLOT.
MAINTENANCE
INSPECT ALL MATTING PERIODICALLY, AND AFTER RAINSTORMS TO CHECK FOR FILL EROSION, DISLOCATION, OR FAILURE. WHERE EROSION IS
OBSERVED, APPLY ADDITIONAL MATTING. IF WASHOUT OCCURS, REPAIR THE SLOPE GRADE, RESEED AND REINSTALL MATTING. CONTINUE INSPECTIONS
UNTIL VEGETATION IS FIRMLY ESTABLISHED.
ANCHOR NETTING IN 6" TR NCH
18" OVERLAP
JOIN STRIPS BY ANCHORING
AND OVERLAPPING
r
EXCELSIOR MATTING 8' EXCELSIOR MATTING
STAPLE PATERN STAPLE PATERN
1 FOOT GRID 1 FOOT GRID
NTS NTS
MAXIMUM PLACEMENT OF POST USING HOG WIRE WITH APPROVED EROSION
CONTROL FABRICS TO BE 10 FEET
MAXIMUM PLACEMENT OF POST WITHOUT HOG WIRE USING APPROVED EROSION
CONTROL FABRICS TO BE 6 FEET TO 8 FEET APART
POST METAL T-POST 5 FEET OR 6 FEET IN HEIGHT DEPENDING ON FILL
SLOPE.
FABRIC 36 INCHES IN WIDTH (MUST MEET ENGINEERS SPECIFICATIONS
FOR EROSION CONTROL).
STONE NO. 4 WASHED STONE TO BE PLACED 12 INCHES DEEP AT SILT
NOTE: FENCE.
STRUCTURAL STONE SHALL BE
(CLASS "B") STONE FOR EROSION
CONTROL PURPOSES.
BEDIMENT NO. 5 ORNTNOL57TONE STONE.ALL SILT FENCE WITH STONE OUTLET DETAIL
2' NOT TO SCALE
SILT FE
V-6" MIN.
2.•7
1' 2all° -
FLOW °°°°°OOQaO 12" MIN.
STRUCTURAL
STONE
CROSS SECTION
NOTE: STONE OUTLETS TO BE PROVIDED
AT INTERVALS OF 509 OR LESS
FRONT VIEV1 NOTE:
EXCELSIOR MATTING DETAIL
NOT TO SCALE
2.0'
IN CHANNELS, ROLL OUT STRIPS OF NETTING PARALLEL TO THE
DIRECTION OF FLOW AND OVER THE PROTECTIVE MULCH
STAPLES MUST BE INSTALLED IN A "DIAMOND PATTERN" NO MORE
THAN 3 FEET APART. TO ASSURE PROPER ANCHORING OF
EXCELSIOR MATTING.
8.0'
\2:1 SLOPE
OR FLATTER 000 g o
to o
O
CLASS I RIP -RAP 0 000 ° 2:1 SLOPE
TO BE PROVIDED o o OR FLATTER
WHERE INDICATED
ON PLANS
:�?
TYPICAL BERM CROSS SECTION
CE BERM/SWALE NOT TO SCALE
1. REMOVE AND PROPERLY DISPOSE OF ALL TREES, BRUSH, STUMPS AND OTHER OBJECTIONAL MATERIAL.
2. ENSURE THAT THE MINIMUM CONSTRUCTED CROSS SECTION MEETS ALL DESIGN REQUIREMENTS.
3. ENSURE THAT THE TOP OF THE DIKE IS NOT LOWER AT ANY POINT THAN THE DESIGN ELEVATION PLUS
THE SPECIFIED SETTLEMENT.
4. PROVIDE SUFFICIENT ROOM AROUND DIVERSIONS TO PERMIT MACHINE REGRADING AND CLEANOUT.
5. VEGETATE THE RIDGE IMMEDIATELY AFTER CONSTRUCTION, UNLESS IT WILL REMAIN IN PLACE LESS
THAN 30 WORKING DAYS.
MAINTENANCE
INSPECT TEMPORARY DIVERSIONS ONCE A WEEK AND AFTER EVERY RAINVALL. IMMEDIATELY REMOVE
SEDIMENT FROM THE FLOW AREA AND REPAIR THE DIVERSION RIDGE. CAREFULLY CHECK OUTLETS AND
MAKE TIMELY REPAIRS AS NEEDED. WHEN THE AREA PROTECTED IS PERMANENTLY STABILIZED, REMOVE
THE RIDGE AND THE CHANNEL TO BLEND WITH THE NATURAL GROUND LEVEL AND APPROPRIATELY
STABILIZE IT.
STEEPER GRADES ALONG BERM MAY REQUIRE VEGETATIVE OR
MECHANICAL STABILIZATION. EXCAVATED MATERIAL SHOULD BE
PLACED AND COMPACTED ON LOWER SIDE OF DIVERSION AND
SEEDED AS SOON AS POSSIBLE. TEMPORARY BERMS AND/OR
DIVERSIONS SHOULD BE SIZED TO HANDLE A 10-YEAR STORM.
BERMS WITH A DRAINAGE AREA OVER 5 ACRES SHOULD BE
CALCULATED INDIVIDUALLY.
FLOW
­►
SEE INSET
PLAN VIEW
�usyl *I
1. USE MINIMUM 12" DIA. EXCELSIOR, COIR, OR STRAW WATTLE.
2. USE 2 FT, WOODEN STAKES WITH A 2" x 2" CROSS SECTION
3. INSTALL A MINIMUM OF 2 UPSLOPE STAKES AND 4 DOWNSLOPE
STAKES AT AN ANGLE TO WEDGE WATTLE TO BOTTOM OF DITCH.
4. PROVIDE STAPLES OF 0.125" DIA. STEEL WIRE FORMED INTO
A 'U' SHAPE NOT LESS THAN 12" IN LENGTH.
5. INSTALL STAPLES APPROXIMATELY EVERY 1 LINEAR FOOT ON BOT
SIDES OF WATTLE AND AT EACH END TO SECURE IT TO THE SOIL.
6. INSTALL MATTING IN ACCORDANCE WITH NCDOT SECTION 1631 OF
THE STANDARD SPECIFICATIONS.
7. [ROPR TP [P;UACRU;A,ODE (PAM) APPLICATION, OBTAIN A SOIL
SAMPLE FROM PROJECT LOCATION, AND FROM OFF -SITE MATERIAL
AND ANALYZE FOR APPROPRIATE PAM FLOCCULANT TO BE APPLIE
TO EACH WATTLE.
8. INITIALLY APPLY 3.5 OUNCES OF ANIONIC OR NEUTRALLY CHAR
POLYACRYLAMIDE (PAM) OVER WATTLE WHERE WATER WILL FLOW
AND AFTER EVERY RAINFALL EVENT THAT IS EQUAL TO OR EXCEE
0.50 INCHES.
PERMANENT SEEDING
DEFINITION
SEEDING DISTURBED AREAS WITH PERENNIAL GRASSES AND (OR) LEGUMES TO PROVIDE A
PERMANENT VEGETATIVE COVER TO LESSEN RUNOFF AND SOIL EROSION.
PURPOSE
TO LESSEN SOIL EROSION AND PERMANENTLY STABILIZE DISTURBED AREAS CREATED BY
GRADING OF CONSTRUCTION SITES.
CONDITIONS WHERE PRACTICE APPLIES
ALL BARE SOIL AREAS ON CONSTRUCTION SITES WHICH ARE NOT COVERED BY STRUCTURES
OR OTHER EROSION CONTROL DEVICES.
PREPARATION
PREPARE SEEDBED BY SPREADING 3 - 6 INCHES OF TOPSOIL OVER AREA TO BE SEEDED.
REMOVE ALL STONES, BOULDERS, STUMPS OR DEBRIS FROM THE SURFACE WHICH WOULD
PROHIBIT GERMINATION OR PLANT GROWTH.
INCORPORATE INTO THE SOIL 800 TO 1,000 POUNDS OF 10-10-10 FERTILIZER PLUS 500
POUNDS OF TWENTY PERCENT (207) SUPERPHOSPHATE PER ACRE AND TWO TONS OF
DOLOMITIC LIME PER ACRE UNLESS SOIL TESTS INDICATE THAT A LOWER RATE OF LIME
CAN BE USED.
MULCH AFTER SEEDING WITH 1.5 TONS OF GRAIN STRAW PER ACRE AND EITHER CRIMP
STRAW INTO SOIL OR TACK WITH LIQUID ASPHALT AT 400 GALLONS PER ACRE OR
EMULSIFIED ASPHALT AT 300 GALLONS PER ACRE,
SELECT SEEDING MIXTURE AND BEST PLANTING DATES FROM TABLE 13.
TABLE 13
PERMANENT SEEDINGS
D
PLANTS & MIXTURE
PLANTING RATE/ACRE
PLANTING DATES
TALL FESCUE
100-150 LBS.
AUG. 15 - OCT. 15
GED
(LOW MAINTENANCE)
FEB. 15 - MAY 1
DS
TALL FESCUE
200-250 LBS.
AUG. 15 - OCT. 15
WATERWAYS AND
FEB. 15 - MAY 1
LAWNS (HIGH MAINT.)
BLEND OF TWO TURF-
TYPE TALL FESCUES
200-250 LBS.
AUG. 15 - OCT. 15
FEB. 15 - MAY 1
(907) AND TWO OR
MORE IMPROVED
KENTUCKY BLUEGRASS
1/4" WIRE MESH VARIETIES (10%)
(HIGH MAINTENANCE)
TALL FESCUE
100 LBS.
FEB. 15 - MAY 1
AND
AND
AUG. 15 - OCT. 15
KOBE OR KOREAN
20-25 LBS.
LESPEDEZAI
TALL FESCUE AND
50 LBS.
SERICEA LESPEDEZA
60 LBS.
NOV. 1 - FEB. 1
(UNSCARIFIED)
TALL FESCUE AND
60 LBS.
JULY AND AUGUST
GERMAN MILLET OR
AND
SUDANGRASS2
30 LBS.
TALL FESCUE
70 LBS.
NOV, 1 - JAN. 30
AND
AND
RYEGRASSZ
25 LBS.
COMMON BERMUDAGRASS
8 LBS. (HULLED)
APRIL 15 - JUNE 30
15-20 LBS. (UNHULLED)
FEB. 1 - MARCH 30
1FOR SPRING SEEDINGS, USE SCARIFIED LESPEDEZA
SEED. FOR LATE
FALL AND
WINTER SEEDINGS, USE UNSCARIFIED SEED.
2ANNUALS SUCH AS MILLET, SUDANGRASS AND RYEGRAIN MUST BE
KEPT AT 10-12"
MAXIMUM HEIGHT.
NOTE: SEDIMENT CONTROL STONE
SHALL BE No. 5 OR 57
WIRE MESH SHALL BE HARDWARE
12" CLOTH 23 GAGE MIN. AND SHALL
HAVE 1/4 INCH MESH OPENINGS.
/r �r TOP OF WIRE MESH SHALL BE A
MINIMUM OF ONE FOOT BELOW THE
SHOULDER OR ANY DIVERISION POINT.
ROCK INLET PROTECTION
NOT TO SCALE
TEMPORARY SEEDING
DEFINITION
SEEDING DISTURBED AREAS WITH ANNUAL GRASSES OR LEGUMES TO PROVIDE TEMPORARY
GROUND COVER TO LESSEN SOIL EROSION.
PURPOSE
TO TEMPORARILY GRADED CUT AND FILL SLOPES THAT CANNOT BE SEEDED WITH
STABILIZE BIL ZE
PERMANENT VEGETATION WITHIN THIRTY DAYS AFTER COMPLETION.
TO TEMPORARILY STABILIZE GRADED AREAS OF BARE SOIL WHERE PERMANENT VEGETATIVE
COVER IS NOT NEEDED OR WHERE GRADING HAS NOT BEEN COMPLETED AND PERMANENT
SEEDING WILL BE DONE LATER.
CONDITIONS WHERE PRACTICE APPLIES
WHERE BARE SOIL HAS BEEN EXPOSED BY GRADING, AND VEGETATIVE COVER IS NEEDED
FOR ONE YEAR OR LESS. MAY INCLUDE SUCH AREAS AS TEMPORARY SEDIMENT POND,
DIVERSIONS, SOIL STOCKPILES, BUILDING PADS, ROUGH -GRADED ROAD BANKS, ETC. IT
IS ALSO USED TO PROVIDE A TEMPORARY PERIMETER BUFFER.
PREPARATION
PREPARE SEEDBED BY RIPPING, CHISELING, HARROWING, TO A DEPTH OF AT
LEAST SIX INCHES SO AS TO PRODUCE A LOOSE, FRIABLE SURFACE. INCORPORATE
750-1,000 POUNDS 10-10-10 FERTILIZER AND UP TO TWO TONS OF DOLOMITIC LIME PER
ACRE (NOTE: LIME MAY NOT BE NEEDED IF A SOIL INDICATED A pH OF 6.5 OR
HIGHER). MULCHING IS REQUIRED ACCORDING TO THE SAME SPECIFICATIONS AS FOR
PERMANENT SEEDING UNLESS WAIVED BY SOIL SCIENTIST. SELECT SEEDING MIXTURE AND
BEST PLANTING DATES FROM TABLE 12.
TABLE 12
TEMPORARY SEEDINGS
SEEDING MIXTURES
SEEDING RATES (LB/ACRE)
PLANTING DATES
RYE GRAIN AND
120 LBS.
JAN. 1 - MAY 1
KOBE LESPEDEZA
50 LBS.
GERMAN MILLET OR
40-50 LBS.
MAY 1 - AUG. 15
SUDAN GRASS
RYE (GRAIN)
120 LBS.
AUG. 15 - DEC. 30
(MAY SUBSTITUTE OATS
BEFORE OCT. 1 OR WHEAT
FROM OCT. 1-NOV. 15)
ANNUAL RYEGRASS 40 LBS. AUG. 15 - NOV. 30
WEEPING LOVEGRASSi 5 LBS. MAY 1 - AUG. 15
1WEEEPING LOVEGRASS IS A PERENNIAL GRASS BUT IS INCLUDED HERE BECAUSE OF
ITS ADAPTABILITY TO POOR SOIL CONDITIONS AND DROUGHTY SITES.
BFT M9k
p� TSFN
"HOG WIRE ATTACHED,
TO POSTS WITH LENGTHS
OF WIRE HORIZONTAL METAL POST
N-NfWIRED SECURELY TO VERTICA
POSTS
BAFFLE INSTALLATION - STER F
NOTES:
1. DRIVE 5' STEEL FENCE POST AT LEAST 24" INTO
SOLID GROUND
2. WOOD POSTS MUST BE 4" IN DIAMETER
3. USE STAPLES V APART TO ATTACH FABRIC
TO "HOG WIRE"
4. BAFFLE SPACED AS PER APPROVED PLAN.
CUT 6" SLITS I ENCE F
ALONG THE BOTTOM WIRE
EVERY OTHER SQUARE OF
HOG WIRE VERTICALLY AN
HORIZONTALLY
BAFFLE
RIP -RAP APRON ENERGY DISSIPATOR
FOR STORMWATER OUTLET PROTECTION
PLAN
La
La
d
o� o
°� �� ✓� s
O OO�DERUNER
GEOTEXTILE UNDERLINER SECTION A -A
PIPE OUTLET TO WELL-DEFINED CHANNEL
SECTION A -A
PIPE OUTLET TO FLAT AREA
WITH NO DEFINED CHANNEL
NOTES RIP -RAP OUTLET OR PLUNGE POOL
1. APRON LINING MAY BE RIPRAP, 1. ENSURE THAT THE SUBGRADE FOR THE FILTER AND RIP -RAP
GROUTED RIPRAP OR CONCRETE FOLLOWS THE REQUIRED LINES AND GRADES SHOWN IN THE PLAN.
2. L IS THE LENGTH OF THE COMPACT ANY FILL REQUIRED IN THE SUBGRADE TO THE DENSITY OF
a THE SURROUNDING UNDISTURBED MATERIAL. LOW AREAS IN THE
RIPRAP APRON. SUBGRADE ON UNDISTURBED SOIL MAY ALSO BE FILLED BY
3. d = 1.5 TIMES THE MAXIMUM STONE INCREASING THE RIP -RAP THICKNESS.
DIAMETER BUT NOT LESS THAN 6". 2• THE RIP -RAP AND GRAVEL FILTER MUST CONFORM TO THE
4. DIMENSIONS AND SPECIFICATIONS SPECIFIED GRADING LIMITS ON THE PLANS.
MUST BE DETERMINED BY
APPROPRIATE ENGINEERING 3. FILTER CLOTH, WHEN USED, MUST MEET DESIGN REQUIREMENTS
DESIGN METHOD. AND BE PROPERLY PROTECTED FROM PUNCHING OR TEARING DURING
INSTALLATION. REAPIR ANY DAMAGES BY REMOVING THE RIP -RAP
AND PLACING ANOTHER PIECE OF FILTER CLOTH OVER THE DAMAGED
AREA. ALL CONNECTING JOINTS SHOULD OVERLAP A MINIMUM OF 1
FT. IF THE DAMAGE IS EXTENSIVE, REPLACE THE ENTIRE FILTER
CLOTH.
4. RIP -RAP MAY BE PLACED BY EQUIPMENT, BUT TAKE
E CARE TO AVOID DAMAGING THE FILTER.
5. THE MINIMUM THICKNESS OF THE RIP -RAP SHOULD BE 1.5 TIOMES THE MAXIMUM STONE DIAMETER.
6. RIP -RAP MAY BE FIELD STONE OR ROUGH QUARRY STONE. IT SHOULD BE HAIR, ANGULAR, HIGHLY WEATHER
RESISTANT AND WELL GRADED.
7. CONSTRUCT THE APRON ON ZERO GRADE WITH NO OVERFALL 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 RCEIVING STREAM AND PREFERABLY STRAIGHT
THROUGHOUT ITS LENGTH. IF A CURVE IS NEEDED TO FIT 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 AFTER HEAVY RAINS 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.
DEFINITION: GRAVELED AREA TO BE LOCATED AT POINTS WHERE VEHICLES ENTER AND LEAVE A CONSTRUCTION SITE.
PURPOSE: TO PROVIDE A BUFFER AREA WHERE VEHICLES CAN DROP THEIR MUD AND SEDIMENT TO AVOID TRANSPORTING IT ONTO PUBLIC
ROADS, TO CONTROL EROSION FROM SURFACE RUNOFF, AND TO HELP CONTROL DUST.
CONDITIONS: TO BE USED WHEREVER TRAFFIC WILL BE LEAVING A CONSTRUCTION SITE AND MOVING DIRECTLY ONTO A PUBLIC ROAD OR
/ DESIGN OTHER PAVED OFF -SITE AREA. CONSTRUCTION PLANS SHOULD LIMIT TRAFFIC TO PROPERLY CONSTRUCTED ENTRANCES.
/CRITERIA: AGGREGATE SIZE - USE 2-3 INCH WASHED STONE, WITH GEO-TEX LINER
�O
�o DIMENSIONS OF GRAVEL PAD -THICKNESS = 8 INCHES MINIMUM
O /WIDTH = 25 FOOT MINIMUM OF FULL WIDTH AT ALL POINTS OF THE VEHICULAR ENTRANCE
J�v� oo° AND EXIT AREA, WHICHEVER IS GREATER
/ Q �00 LENGTH = 100 FOOT MINIMUM WITH GEO-TEX LINER
0 00 LOCATION = LOCATE CONSTRUCTION ENTRANCES AND EXITS TO LIMIT SEDIMENT FROM
V� 0°p° LEAVING THE SITE AND TO PROVIDE FOR MAXIMUM UTILITY BY ALL
/°0 0 o OO CONSTRUCTION VEHICLES. AVOID STEEP GRADES AND ENTRANCES AT CURVES IN
000 0 00
0()010 oo PUBLIC ROADS.
/ o0°�opOOoo°O o00°°ooa SITE CONDITIONS MAY REQUIRE VARIATIONS FROM THESE DESIGN CRITERIA. VARIATIONS WILL BE DETERMINED OR APPROVED
o ° o o�oo�0000000 ° BY EITHER THE APPROPRIATE CITY OR STATE EROSION CONTROL AUTHORITY.
800 oo°Oo°°o °°°oSo ° TEMPORARY CONSTRUCTION ENTRANCE
o o° o 0 0 0 ° °° °o ° o o° °oo °o'
oo°ao 88��80 0000�oS o° °o °o °ooMl" DETAIL
OppO o 00 cA og�° oho O o o Oho
pO�Qop0 °°O °°oo°Cd°°80°0°0000 00°00 oSo°� CIO NOT TO SCALE
° 06
Oho °off° o°6O °o
Op 00 80 y °Q O p p O, 00 °Opp
8" MIN. ° O°o0°OOp O 0�00°°OOOOO°�O�C>
o$o o°°�°goopo°°0000�oo°o0000°°000 SEDIMENT BASIN W/ SKIMMER OUTLET
O0000°c; 000�°0 o 000Ock Oo°oO00°00o AND EMERGENCY SPILLWAY
0 0 �80 0° °000 OD° °0000° oq�°Oo° NTS
000° �00000 o°o°o° c, c, c9oZ o O
2" TO 3" o0 O° C p 0 0 0 O 00 0O �0 0 C>
COARSE AGGREGATE O OHO p�° Oqo O % °00° ° °O o° -
pO08° 8 0O O
°° p�0p�°° °OOOOp /
GEO-TEX LINER O °0�0o 00°0 0o EMBANKMENT
O
o °o�o moo y
00 =�
RISER
}( SKIMMER"
SPILLWAY
INFLOW STRUCTURE 1 DEWATERING
PERSPECTIVE VIEW
INFI
CROSS-SECTION
CONSTRUCTION SPECIFICATIONS
1. CLEAR, GRUB AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT MAT. REMOVE ALL SURFACE SOIL CONTAINING HIGH AMOUNTS
OF ORGANIC MATTER AND STOCKPILE OR DIPOSE OF IT PROPERLY. HAUL ALL OBJECTIONABLE MATERIAL TO THE DESIGNATED DISPOSAL AREA. PLACE
TEMPORARY SEDIMENT CONTROL MEASURES BELOW BASIN AS NEEDED.
2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY VEGETATION, ORGANIC MATTER, AND OTHER OBJECTIONABLE MATERIAL. PLACE
THE FILL IN LIFTS NOT TO EXCEED 9", AND MACHINE COMPACT IT. OVER FILL THE EMBANKMENT 6" TO ALLOW FOR SETTLEMENT.
3. SHAPE THE BASIN TO THE SPECIFIED DIMENSIONS. PREVENT THE SKIMMING DEVICE FROM SETTLING INTO THE MUD BY EXCAVATING A SHALLOW PIT UNDER
THE SKIMMER OR PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF STONE OR TIMBER.
4. PLACE THE BARREL (TYPICALLY 4-INCH SCHEDULE 40 PVC PIPE) ON A FIRM, SMOOTH FOUNDATION OF IMPERVIOUS SOIL, DO NOT USE PERVIOUS MATERIAL
SUCH AS SAND, GRAVEL OR CRUSHED STONE AS BACKFILL AROUND THE PIPE. PLACE THE FILL MATERIAL AROUND THE PIPE SPILLWAY IN 4-INCH LAYERS
AND COMPACT IT UNDER AND AROUND THE PIPE TO AT LEAST THE SAME DENSITY AS THE ADJACENT EMBANKMENT. CARE MUST BE TAKEN NOT TO RAISE THE
PIPE FROM THE FIRM CONTACT WITH ITS FOUNDATION WHEN COMPACTING UNDER THE PIPE HAUNCHES.
PLACE A MINIMUM DEPTH OF 2 FEET OF COMPACTED BACKFILL OVER THE PIPE SPILLWAY BEFORE CROSSING IT WITH CONSTRUCTION EQUIPMENT. IN NO CASE
SHOULD THE PIPE CONDUIT BE INSTALLED BY CUTTING A TRENCH THROUGH THE DAM AFTER THE EMBANKMENT IS COMPLETE.
5, ASSEMBLE THE SKIMMER FOLLOWING THE
MANUFACTURERS
NU ACTURERS INSTRUCTIONS OR AS
DESIGNED.
6. LAY THE ASSEMBLED SKIMMER ON THE BOTTOM OF THE BASIN WITH THE FLEXIBLE JOING AT THE INLET OF THE BARREL PIPE. ATTACH THE FLEXIBLE JOINT
TO THE BARREL PIPE AND POSITION THE SKIMMER OVER THE EXCAVATED PIT OR SUPPORT. BE SURE TO ATTACH A ROPE TO THE SKIMMER AND ANCHOR IT
TO THE SIDE OF THE BASIN. THIS WILL BE USED TO PULL THE SKIMMER TO THE SIDE FO MAINTENANCE.
7. EARTHEN SPILLWAYS- INSTALL THE SPILLWAY IN UNDISTURBED SOIL TO THE CREATES EXTENT POSSIBLE. THE. ACHIEVEMENT OF PLANNED ELEVATIONS, GRADE,
DESIGN WIDTH AND ENTRANCE AND EXIT CHANNEL SLOPES ARE CRITICAL TO THE SUCESSFULL OPERATION OF THE SPILLWAY. THE SPILLWAY SHOULD BE LINED
WITH LAMINATED PLASTIC OR IMPERMEABLE GEOTEXTILE FABRIC. THE GABRIC MUST BE WIDE AND LONG ENOUGH TO COVER THE BOTTOM AND SIDES AND
EXTEND ONTO THE TOP OF THE DAM FOR ANCHORING IN A TRENCH. THE EDGES MAY BE SECURED WITH 8-INCH STAPLES OR PINS. THE FABRIC MUST BE
LONG ENOUGH TO EXTEND DOWN THE SLOPE AND EXIT ONTO STABLE GROUND.D THE WIDTH OF THE FABRIC MUST BE ONE PIECE, NOT JOINED OR SPLICED;
OTHERWISE WATER CAN ET UNDER THE FABRIC. IF THE LENGTH OF THE FABRIC IS INSUFFICIENT FOR THE ENTIRE LENGTH OF THE SPILLWAY, MULTIPLE
SECTIONS, SPANNING THE COMPLETE WIDTH, MAY BE USED. THE UPER SECTION(S) SHOULD OVERLAP THE LOWER SECTION(S) SO THAT WATER CANNOT FLOW
UNDER THE FABRIC. SECURE THE UPPER EDGE AND SIDES OF THE FABRIC IN A TRENCH WITH STAPLES OR PINS.
8. INLETS- DISCHARGE WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE TEMPORARY SLOPE DRAINS OR DIVERSIONS WITH OUTLET PROTECTION
TO DIVERT SEDIMENT -LADEN WATER TO THE UPPER END OF THE POOL AREA TO IMPROVE BASIN TRAP EFFICIENTY.
9. EROSION CONTROL- CONSTRUCT THE STRUCTURE SO THAT THE DISTURBED AREA IS MINIMIZED. DIVERT SURFACE WATER AWAY FROM BARE AREAS. COMPLETE
THE EMBANKMENT BEFORE THE AREA IS CLEARED. STABILIZE THE EMERGENCY SPILLWAY EMBANKMENT AND ALL OTHER DISTURBED ARAS ABOVE THE CREST
OF THE PRINCIPAL SPILLWAY IMMEDIATELY AFTER CONSTRUCTION.
10. INSTALL POROUS BAFFLES.
11. AFTER ALL THE SEDIMENT -PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, REMOVE THE STRUCTURE AND ALL THE UNSTABLE SEDIMENT. SMOOTH
THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE PROPERLY.
MAINTENANCE
INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY.
REMOVE SEDIMENT AND RESTORE THE BASIN TO ITS ORIFINAL DIMENSIONS WHEN SEDIMENT ACCUMULATES TO 1/2 THE HEIGHT OF THE FIRST BAFFLE. PULL THE
SKIMMER TO ONE SIDE SO THAT THE SEDIMENT UNDERNEATH IT CAN BE EXCAVATED. ESCAVATE THE SEDIMENT FROM THE ENTIRE BASIN, NOT JUST AROUND
THE SKIMMER OR THE FIRST CELL. MAKE SURE VEGETATION GROWING IN THE BOTTOM OF THE BASIN DOES NOT HOLD DOWN THE SKIMMER.
REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE -ANCHOR THE BAFFLES IF WATTER IS FLOWING UNDERNEATH OR AROUND THEM..
IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE IS WATER IN THE BASIN, USUALLY JERKING ON THE ROPE WILL MAKE THE SKIMMER BOB UP AND DOWN
AND DISLODGE THE DEBRIS AND RESTORE FLOW. IF THIS DOES NOT WORK, PULL THE SKIMMER OVER TO THE SIDE OF THE BASIN AND REMOVE THE DEBRIS.
ALSO CHECK THE ORIFICE INSIDE THE SKIMMER TO SEE IF IT IS CLOGGED; IF SO, REMOVE THE DEBRIS.
IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE REMOVED AND THE OBSTRUCTION CLEARED WITHA PLUMBER'S SNAKE OR BY
FLUSHING WITH WATER. BE SURE AND REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER.
CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED REPAIRS WITH FABRIC THAT SPANS THE FULL WIDTH OF THE SPILLWAY. CHECK
THE EMBANKMENT, SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, AND INSPECT THE EMBANKMENT FOR PIPING AND SETTLEMENT. MAKE ALL NECESSARY
REPAIRS IMMEDIATELY. REMOVE ALL TRASH AND OTHER DEBRIS FROM THE SKIMMER AND POOL AREAS.
FREEZING WEATHER CAN RESULT IN ICE FORMING IN THE BASIN. SOME SPECIAL PRECAUTIONS SHOULD BE TAKEN IN THE WINTER TO PREVENT THE SKIMMER
FROM PLUGGING WITH ICE.
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ERO-DETAILS.DWG
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