SW4211202_Plansheet C7.2 - Misc. Detail_20220307

do = PI
La = AF
W = APRON WIDTH
do + La
d = APRON DEPTH
PLAN
La
SLOPE 0 % I I FLOW
d SECTION A -A
NOTES:
1. SEE SCHEDULE FOR DIMENSIONS.
2. INSTALL A FILTER BLANKET OR FILTER FABRIC
BETWEEN THE RIPRAP AND SOIL FOUNDATION.
3. FILTER FABRIC SHALL BE MIRAFI 500 OR EQUAL.
FILTER FABRIC
Outlet
Pipe
Diameter
Discharge
d50
La
W
dmax
apron
thickness
NCDOT
ri ra
in)
(cfs)
(ft
ft
ft
ft
ft
Class
100
24"
15
0.4
12
14
0.6
0.9
B
PIPE OUTLET STABILIZATION
NOT TO SCALE
WITH LINER, NO GRAVEL APPROACH
ONSITE CONCRETE WASHOUT
STRUCTURE WITH
LINER
10'-0" MIN.
A
0
0
SANDBAGS (TYP.)
0
0 OR STAPLES
?
10 MIL
1:1 PLASTIC
Q o
SANDBAGS (TYP.)
SIDE SLOPE LINING OR STAPLES
a
0
a
0
(TYP.)
0
0co 0 o
OzX
A
CLEARLY MARKED SIGNAGE
SECTION A -A
CONCRETE
NOTING DEVICE (18"X24" MIN.)
WASHOUT
NOTES:
1. ACTUAL LOCATION DETERMINED IN FIELD
2. THE CONCRETE WASHOUT STRUCTURES SHALL BE
MAINTAINED WHEN THE LIQUID AND/OR SOLID REACHES
75% OF THE STRUCTURES CAPACITY.
PLAN
3•CONCRETE WASHOUT STRUCTURE NEEDS TO BE
CLEARY MARKED WITH SIGNAGE NOTING DEVICE.
BELOW GRADE WASHOUT STRUCTURE
NOT TO SCALE
HIGH
10'-0" MIN.
SANDBAGS (TYP.)
COHESIVE &
B
OR STAPLES
LOW FILTRATION
HIGH
SOIL BERM
10 MIL COHESIVE &
0
O O O
PLASTIC LINING LOW FILTRATION
0
0
1:1 SIDE SLOPE SOIL BERM
z
(TYP.)
CP o
o 6CN
M N
-
/ O Z X
O
o -
ZY)
0
2'-0"
6"
SECTION B-B
B
SANDBAGSTP.)
NOTES:
OR STAPLE
1. ACTUAL LOCATION DETERMINED IN FIELD
CLEARLY MARKFD SIGNAGF
2. THE CONCRETE WASHOUT STRUCTURES
CONCRETE
NOTING DEVICE (18"X24" MIN.)
SHALL BE MAINTAINED WHEN THE LIQUID
WASHOUT
AND/OR SOLID REACHES 75% OF THE
STRUCTURES CAPACITY TO PROVIDE
ADEQUATE HOLDING CAPACITY WITH A
MINIMUM 12 INCHES OF FREEBOARD.
PLAN
3.CONCRETE WASHOUT STRUCTURE NEEDS
TO BE CLEARY MARKED WITH SIGNAGE
NOTING DEVICE.
ABOVE GRADE WASHOUT STRUCTURE
NOT TO SCALE
PRELIMINARY DESIGN
NOT FOR CONSTRUCTION
OUTLET STRUCTURE
-STRUCTURE FOR BASIN #2 AND #4.
31N #2 AND #4. SKIMMER BASIN SKIMMER SHALL BE TIED
SHALL BE TIED INFLOW TO OUTLET STRUCTURE.
_T STRUCTURE. PIPE BAFFLES (STD)
(SEE DETAIL THIS SHEET)
SKIM E� -
CY
Y
BAFFLES
PLAN VIEW
(BASIN #2 & #4)
SKIMMER SEDIMENT BASIN MAINTENANCE:
1. INSPECT SEDIMENT SKIMMER BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT
(ONE-HALF INCH OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE
SEDIMENT AND RESTORE THE BASIN TO ITS ORIGINAL DIMENSIONS WHEN SEDIMENT
ACCUMULATES TO ONE-HALF THE HEIGHT OF THE FIRST BAFFLE. PULL THE SKIMMER
TO ONE SIDE SO THAT THE SEDIMENT UNDERNEATH IT CAN BE EXCAVATED. EXCAVATE
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.
2. REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE -ANCHOR THE BAFFLES IF WATER IS
FLOWING UNDERNEATH OR AROUND THEM.
3. 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.
4. IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE REMOVED AND
THE OBSTRUCTION CLEARED WITH A PLUMBER'S SNAKE OR BY FLUSHING WITH WATER.
BE SURE AND REPLACE THE ORIFICE BEFORE REPOSITIONING THE SKIMMER.
5. CHECK THE FABRIS 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.
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
PLUGGING WITH ICE.
2„-5„ 2„-5„ 2„-5„ ® 2„-5„
(5-12.5cm) (5-12.5cm) (5-12.5cm) (5-12.5cm)
3' 3'
(0.9m) (0.9m)
6' 6'
(1.8m) (1.8m)
3.3' 3.3'
(lm) 1.6' (lm)
(0.5m) _
STAPLE
PATTERNS
0.7 Staples per SQ.YD.
12.5cm) (512.5c1
2'
4, (0.6m)
(1.2m)
(0.5m)
3.3'
• (•)
1.7 Staples per SQ.YD.
2„-5„
(1.2m)
2„-5„
4'
(1.2m)
0
2'
(0.6m)
T
O O O O
�10"(25cm)
O O
O O O(lm)O
(1 m)
1.15 Staples per SQ.YD.
F
2'
(0.6m)
O 5
O
3.31
O O (0)
O O O
3.4 Staples per SQ.YD.
2"-5"
(5-12.5cm)
-10 E,
(25cm)
2„-5„
(5-12.5cm)
DEWATERING
ZONE
INLET SHALL BE PROTECTED
(AS NEEDED) FROM EROSION CMP OUTLET PIPE
WITH RIPRAP, TARP, MATTING CROSS SECTION
OR EQUIVALENT. (BASIN)
REMOVE SILT/SEDIMENT FROM TEMPORARY
DEVICES WHEN ACCUMULATED VOLUME
HAS REACHED 50% CAPACITY.
CONTRACTOR SHALL UTILIZE A SILT BAG
FOR ALL DEWATERING OPERATIONS.
V MIN FREEBOARD
/ TOP OF BERM
EMERGENCY
SPILLWAY
ELEVATION
DISSIPATER
PAD
RIP RAP
THE INSIDE SLOPES OF THE SKIMMER
SEDIMENT BASIN SHALL BE STABILIZED
WITH NORTH AMERICAN GREEN S75
(STAPLE PATTERN D) EROSION
CONTROL MATTING UPON COMPLETION
OF CONSTRUCTION
NOTES:
1. BASIN SHOULD BE CLEANED OUT WHEN CAPACITY REACHES AN ELEVATION REPRESENTING THAT THE BASIN
IS HALF -FULL.
2. THE TARP USED TO PROTECT THE WEIR SHALL BE THE WIDTH SPECIFIED. THE LENGTH OF THE TARP SHALL BE
ACCORDING TO AVAILABLE SUPPLY. IF MULTIPLE TARPS ARE TO BE USED, THEN TARPS SHALL BE
OVERLAPPED AT LEAST 12". THE UPSTREAM 12" TARP SHALL OVERLAP THE DOWNSTREAM TARP. THE TARP
SHALL BE 50 MIL. HEAVY DUTY SILVER TARPAULINS
OR EQUIVALENT FOR U.V. RESISTANCE.
3. PROVIDE A MINIMUM OF THREE POROUS BAFFLES TO EVENLY DISTRIBUTE FLOW ACROSS THE BASIN,
REDUCING TURBULENCE.
4. BAFFLE MATERIAL MUST BE SECURED AT THE BOTTOM AND SIDES USING STAPLES OR BY TRENCHING AS FOR
A SILT FENCE.
5. MOST OF THE SEDIMENT WILL ACCUMULATE IN THE FIRST BAY, SO THIS SHOULD BE READILY AVAILABLE FOR
MAINTENANCE.
6. DURING THE CONSTRUCTION PHASE OF THE PROJECT, PERMANENT STORMWATER RISER SHALL ONLY
DEWATER FROM THE TOP OF PIPE.
7. POND SHALL NOT BE CONVERTED FOR STORMWATER USE UNTIL APPROVED BY ENVIRONMENTAL ENGINEER.
TEMPORARY SKIMMER SEDIMENT BASIN
NORTH
AMERICAN
GREEN
5401 St. Wendel - Cyathiaua Rd. PH: NO-
PomyvMe, IN 47633 W W W.1I
O
O
----------------------------------------------------------------------------------------------------------------------------------------------
cM
NDTM
21. ALL JOINTS OF THE FLOATATION SECTION SHALL
BE SOLVENT WELDED. JOINTS OF SKINNER SECTION
NEED NOT BE WATER -TIC T.
31. IOO _ HOPE FLEABLE DRAW PIPE IS TO BE ATTACHED
TO THE POW OUTLET STRUCTURE WITH WATER -TIGHT
CONNECTIONS. FWD
4L OW IS TO BE SIZED ACCORDING TO STORAGE
FOR AT LEAST 24-HOURS.
PLAN VEW
.; _
ATTACH NOSCREWS
POE PVC
WITH TWO N0.8 WOOD SCREWS
ORFI E DRILLED
IN ENO CAP
(SEE NOTE D-
scuE
i (TYP.)
FLOATATION
FLANGE WITH RUBBER GASKET CONCRETE
!ATTACH TO STRUCTURE WITH CONCRETE
SCREWS OR OTTER SUITABLE ATTACHMENT
AS APPROVED BY TIE ENGINEER)
FRONT VEW SIDE VIEW
DELAWARE SKMM It DEWATMMG DEVICE APPROVED
DEPARTMENT OF TRANSPORTATION STANDARD Na B!4 (9s) slW 1 of 1 EBCOMMENDED NE.E GNEER
"=SIGN ENGWEER "R1E
-------------- --------- -- ----------- ------------ ---------- --- ---------- - ---------- ----------- -- --------- -------------- ------------ ----------- ----------------------- --- ---------- - ---------- --- ----
SEDIMENT BASIN SKIMMER/DEWATERING OUTLET DEVICE
NOT TO SCALE
CONSTRUCTION SPECIFICATION:
1. GRADE THE BASIN SO THAT THE BOTTOM IS LEVEL FRONT TO BACK AND SIDE TO SIDE.
2. INSTALL POSTS ACROSS THE WIDTH OF THE SEDIMENT TRAP.
3. STEEL POSTS SHOULD BE DRIVEN TO A DEPTH OF 24 INCHES, SPACED A MAXIMUM OF
4 FEET APART, AND INSTALLED UP THE SIDES OF THE BASIN AS WELL. THE TOP OF
THE FABIC SHOULD BE 6 INCHES HIGHER THAN THE INVERT OF THE SPILLWAY. TOPS OF
BAFFLES SHOULD BE 2 INCHES LOWER THAN THE TOP OF THE BERMS.
4. WHEN USING POSTS, ADD A SUPPORT WIRE OR ROPE ACROSS THE TOP OF THE MEASURE
TO PREVENT SAGGING.
5. WRAP POROUS MATERIAL, LIKE JUTE BACKED BY COIR MATERIAL, OVER THE TOP WIRE.
THE FABRIC SHOULD HAVE FIVE TO TEN PERCENT OPENINGS IN THE WEAVE. ATTACH
FABRIC TO A ROPE AND A SUPPORT STRUCTURE WITH ZIP TIES, WIRE, OR STAPLES.
6. THE BOTTOM AND SIDES OF THE FABRIC SHOULD BE ANCHORED IN A TRENCH OR PINNED
WITH 8-INCH EROSION CONTROL MATTING STAPLES.
7. DO NOT SPLICE THE FABRIC, BUT USE A CONTINUOUS PIECE ACROSS THE BASIN.
MAINTENANCE:
1. INSPECT BAFFLES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY REQUIRED
SLOPE
INSTALLATION
DETAIL
1. Prepare soil before Installing rolled
erosion control products (RECPs).
Including any necessary
application of lime. fertilizer, and
seed.
2. Begin at the top of the elope by
anclNNirrg the RECPs in a
6"(15cm) deep X 6"(15cm) wide
1rerrEth with approDdmately 12"
{36cm) of RECPs aDdended beyond
the up -slope portion of the trench.
Anchor the RECPs with a row of
stapleslslakes apprmdmately 12"
(30am) apart in the bottom of the
trench. Backtlll and compact the
:he
after stapling. Apply seed to
the compacted soil and fold the
remaining 12"(30cm) portion of
RECPs back aver the seed and
compacted soil. Secure RECPs
over compacted soil with a row
of stepleslstakes spaced
approximately 12"(30cm) apart
across the width of the RECPs.
3. Roll the RECPs (A) down or (B)
horizontally across the slope.
RECPs will unroll with appropriate
side against the soil surface. All
RECPs must be securely fastened
to soil surface by placing
stapleslslakes in appropriate
locations as shown in the staple
pattern guide.
4. The edges of parallel RECPs must
be stapled with apprmdmatey 2" -
5" (5-12.5cm) overlap depending
on the RECPs typo.
5. Consecutive RECPe spliced down
the slope must be and over and
(Shingle style) with an approximate
3"(7.5cm) overlap. Staple through
overlapped area, approAmately
12"(30cm) apart across entire
RECPs width.
)Iahselaimeer: In loose soil conditions, the use of
The Information presented herein Is general design Information only. For specific appllcaDons, staple or steke lengths greater than
consult an Independent professional far further design guidance. 6"(15crn) may be necessary to
property sewre the RECP's.
Drawn on: 5-4-17
PLAN
RIPRAP HEADWALL, V MIN.
HEIGHT FROM ROAD SHOULDER
1' 3'
TORAGE ZONE
FLOOD STOPAGE ZONE 1.5'
INVERT
PIPE A
FLOW
NC DOT #5 OR #57 J '- CLASS B RIPRAP
WASHED STONE
NOTE
STRUCTURAL STONE SHALL BE
CLASS B STONE AND SHALL BE
PAID FOR AT THE CONTRACT
UNIT PRICE PER TON "STONE FOR
EROSION CONTROL (CLASS "B")."
SEDIMENT CONTROL STONE SHALL
BE NO. 5 STONE AND
SHALL BE PAID FOR AT THE
CONTRACT UNIT PRICE PER TON
"SEDIMENT CONTROL STONE".
DIMENSIONS ARE MINIMUM
ACCEPTABLE UNLESS OTHERWISE
SPECIFIED BY THE ENGINEER.
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FIRM LICENSE C-1891
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SITE
EROSION
CONTROL
DETAILS
SHEET
C7.2
3.75 Staples per SQ.YD.
ROCK PIPE INLET PROTECTION
NOT TO SCALE