SWG010035_Plansheet - Misc. Detail_20211208

DocuSign Envelope ID: 64851B58-COD141`12-ABD4-C1E9659860FE
2-3• COURSE-/
AGGREGATE
EXISTING
SLOPE FOR VEHICULAR TRAFFIC
PAVEMENT
EDGE
MAINTAIN BERM & VALLEY
TO PREVENT SEDIMENT LADEN
WATER FROM LEAVING SITE
12"
10"
24" 6" MIN.
FILTER FABRIC
TEMPORARY CONSTRUCTION ENTRANCE
(NOT TO SCALE)
DESIGN CRITERIA
AGGREGATE SIZE - USE 2-3 INCH WASHED STONE.
DIMENSIONS OF GRAVEL PAD:
THICKNESS: 6 INCHES MINIMUM
WIDTH: 12-FEET MINIMUM OR FULL WIDTH AT ALL POINTS OF
THE VEHICULAR ENTRANCE AND EXIT
AREA, WHICHEVER IF GREATER
LENGTH: 50-FEET MINIMUM
LOCATION - LOCATE CONSTRUCTION ENTRANCES AND EXITS TO LIMIT
SEDIMENT FROM LEAVING THE SITE AND TO PROVIDE FOR MAXIMUM
UTILITY BY ALL CONSTRUCTION VEHICLES. AVOID STEEP GRADES,
AND ENTRANCES AT CURVES IN PUBLIC ROADS.
WASHING - IF CONDITIONS AT THE SITE ARE SUCH THAT MOST OF THE
MUD AND SEDIMENT ARE NOT REMOVED BY VEHICLES TRAVELING
OVER THE GRAVEL, THE TIRES SHOULD BE WASHED. WASHING
SHOULD BE DONE ON AN AREA STABILIZED WITH CRUSHED STONE
THAT DRAINS INTO A SEDIMENT TRAP OR OTHER SUITABLE DISPOSAL
AREA. A WASH RACK MAY ALSO BE USED TO MAKE WASHING MORE
CONVENIENT AND EFFECTIVE.
CONSTRUCTION SPECIFICATIONS
1. CLEAR THE ENTRANCE AND EXIT AREA OF ALL VEGETATION,
ROOTS, AND OTHER OBJECTIONABLE MATERIAL AND PROPERLY
GRADE IT.
2. PLACE THE GRAVEL TO THE SPECIFIC GRADE AND DIMENSIONS
SHOWN ON THE PLANS, AND SMOOTH IT.
3. PROVIDE DRAINAGE TO CARRY WATER TO SEDIMENT TRAP OR
OTHER SUITABLE OUTLET.
4. USE GEOTEXTILE FABRICS BECAUSE THEY IMPROVE STABILITY
OF THE FOUNDATION IN LOCATIONS SUBJECT TO SEEPAGE OR HIGH
WATER TABLE.
MAINTENANCE
MAINTAIN THE GRAVEL PAD IN A CONDITION TO PREVENT MUD OR
SEDIMENT FROM LEAVING THE CONSTRUCTION SITE. THIS MAY
REQUIRE PERIODIC TOPDRESSING WITH 2-INCH STONE. AFTER EACH
RAINFALL, INSPECT ANY STRUCUTRE USED TO TRAP SEDIMENT AND
CLEAN IT OUT AS NECESSARY. IMMEDIATELY REMOVE ALL
OBJECTIONABLE MATERIALS SPILLED, WASHED, OR TRACKED ONTO
PUBLIC ROADWAYS.
_ STORM PIPE
---------
CONSTRUCTION SPECIFICATIONS
PLACE RIPRAP SO THAT IT FORMS A DENSE,
BEGIN FILTER FABRIC
WELL -GRADED MASS OF STONE WITH A MINIMUM OF
® END OF PIPE/FES I'^
VOIDS. THE DESIRED DISTRIBUTION OF STONES
RIP RAP APRON
THROUGHOUT THE MASS MAY BE OBTAINED BY
THICKNESS AS CONTINUE FILTER FABRIC
SELECTIVE LOADING AT THE QUARRY, AND
PER PLAN BEYOND RIP RAP APRON
CONTROLLED DUMPING DURING FINAL PLACEMENT.
RIP RAP GRAVEL
PLACE RIPRAP TO ITS FULL THICKNESS IN ONE
SIZED & PLACED
OPERATION. DO NOT PLACE RIPRAP BY DUMPING
AS PER PLAN
THROUGH CHUTES OR OTHER METHODS THAT
F.ES
CAUSE SEGREGATION OF STONE SIZES. TAKE CARE
NOT TO DISLODGE THE UNDERLYING BASE OR
FILTER WHEN PLACING STONES.
STORM PIPE
W2
MAINTENANCE
RIPRAP SHOULD BE INSPECTED PERIODICALLY AND
AFTER HEAVY RAINFALLS FOR SCOUR OR
W1
(3*Do)
DISLODGED STONES. CONTROL OF WEED AND
BRUSH GROWTH MAY BE NEEDED IN SOME
La
LOCATIONS. IMMEDIATELY MAKE ALL NEEDED
(Apron Length)
REPAIRS TO PREVENT FURTHER DAMAGE.
RIP RAP APRON STABILIZATION DETAIL
(NOT TO SCALE)
Class B RiprapT_
?�
2' ntax. at
center
Filter Cloth
4' to 6'
Cross -Section View
CHECK DAM WITH WEIR
(NOT TO SCALE)
4'
SHOULDER
0.08
0.02
Ka7►F��:i46j�ra7►
1.PLACE STRUCTURAL STONE (CLASS B) TO THE LINES AND DIMENSIONS SHOWN ON
THE PLAN ON A FILTER FABRIC FOUNDATION. THE CREST WIDTH OF THE DAM
SHOULD BE A MINIMUM OF 2 FEET.
2.KEEP THE CENTER STONE SECTION AT LEAST 9 INCHES BELOW THE END WHERE
THE DAM ABUTS THE CHANNEL BANKS.
3.PLACE SEDIMENT CONTROL STONE (#5 OR #57) ON THE UPSTREAM SIDE OF THE
DAM THAT IS A MINIMUM OF 1 FOOT THICK.
4.PROVIDE AN APRON THAT IS 3 TIMES THE HEIGHT OF THE DAM. THE APRON WIDTH
IS AT LEAST 4 FEET LONG. UNDERCUT THE APRON SO THAT THE TOP OF THE
APRON IS FLUSH WITH THE SURROUNDING GRADE.
&EXTEND THE STONE AT LEAST 1.5 FEET BEYOND THE DITCH BANK TO KEEP WATER
FROM CUTTING AROUND THE ENDS OF THE CHECK DAM.
6.EXCAVATE SEDIMENT STORAGE AREA TO THE DIMENSIONS SHOWN ON THE PLAN.
MAINTENANCE
INSPECT CHECK DAMS AND CHANNELS AT LEAST WEEKLY AND AFTER EACH
SIGNIFICANT (2 INCH OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY.
CLEAN OUT SEDIMENT, STRAW, LIMBS, OR OTHER DEBRIS THAT COULD CLOG THE
CHANNEL WHEN NEEDED.
ANTICIPATE SUBMERGENCE AND DEPOSITION ABOVE THE CHECK DAM AND EROSION
FROM HIGH FLOWS AROUND THE EDGES OF THE DAM. CORRECT ALL DAMAGE
IMMEDIATELY. IF SIGNIFICANT EROSION OCCURS BETWEEN DAMS, ADDITIONAL
MEASURES CAN BE TAKEN SUCH AS, INSTALLING A PROTECTIVE RIPRAP LINER IN
THAT PORTION OF THE CHANNEL.
REMOVE SEDIMENT ACCUMULATED BEHIND THE DAMS AS NEEDED TO PREVENT
DAMAGE TO CHANNEL VEGETATION, ALLOW THE CHANNEL TO DRAIN THROUGH THE
STONE CHECK DAM, AND PREVENT LARGE FLOWS FROM CARRYING SEDIMENT OVER
THE DAM. ADD STONES TO DAM AS NEEDED TO MAINTAIN DESIGN HEIGHT AND
CROSS SECTION.
50'
RIGHT OF WAY
20'
PAVEMENT
0.02
4' 5'
SHOULDER DITCH
DI TCH
0.08
L2" S-9.5 B Superpave Asphalt Mix (opt'onal)
8" ABC, Type B
NO TE.•
SHOULDER WIDTH BETWEEN 4' AND 6' SHALL
BE APPROVED BY THE DISTRICT ENGINEER
CONSIDERING ADJACENT LAND CHARACTERISTICS.
RESIDENTIAL LOCAL ROAD
CROSS SECTION DETAIL
WITH 50' R/W
NTS
6"
Praca" Sr &"* and S*Wwasms
B' max. standard atren h fabric with wire fence
& max. extra sfrang ric wit out We fence
s�
last
Plastic or
wire tiro
se
fWM IB-24 r/
Natural
ground
4 Filter
fobric
Wi f
a�ewn,an
steel f Bochfill trench Natural
Poet@'�y ground
' min
24• '. f
mure ma I Ikrtion d" of s eeNmetdfanoa.
P_ GAN G62S
SILT FENCE DETAIL
(NOT TO SCALE)
CONSTRUCTION
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.)
J. CONSTRUCT THE FILTER FABRIC FROM A CON77N000S ROLL CUT TO THE LENGTH OF THE BARRIER
TO AVOID JOINTS. WHEN JOINTS ARE NECESSARY, SECURELY FASTEN THE FILTER CL07H ONLY AT A
SUPPORT POST Wl7H 4 FEET MINIMUM OVERLAP TO 7HE NEXT POST.
4. SUPPORT STANDARD STRENGTH FILTER FABRIC BY WIRE MESH FASTENED SECURELY TO 7HE
UPSLOPE SIDE OF 7HE POSTS EXTEND 7HE WIRE MESH SUPPORT TO 7HT BOTTOM OF THE TRENCH.
FASTEN 7HE WIRE REINFORCEMENT, 7HEN FABRIC ON THE UPSLOPE SIDE OF THE FENCE POST. WIRE
OR PLASTIC ZIP TIES SHOULD HAVE MINIMUM 50 POUND TENSILE STRENGTH.
5. WHEN A WIRE MESH SUPPORT FENCE IS USED, SPACE POSTS A MAXIMUM OF 8 FEET APART.
SUPPORT POSTS SHOULD BE DRIVEN SECURELY INTO 7HE GROUND A MINIMUM OF 24 INCHES
6. EXTRA STRENGTH FILTER FABRIC Wl7H 6 FEET POST SPACING DOE NOT REQUIRE WIRE MESH
SUPPORT FENCE. SECURELY FASTEN 7HE FILTER FABRIC DIREC7L Y TO POSTS WIRE OR PLAS77C
ZIP 77ES SHOULD HAVE MINIMUM 50 POUND TENSILE STRENGTH.
7. EXCA VA 7E A TRENCH APPROXIMA TEL Y 4 INCHES WIDE AND 8 INCHES DEEP ALONG 7HE PROPOSED
LINE OF POSTS AND UPSLOPE FROM 7HE BARRIER (FIGURE 6.62a).
8. PLACE 12 INCHES OF 7HE FABRIC ALONG THE BOTTOM AND SIDE OF THE TRENCH.
9. BACKFILL 7HE TRENCH WI7H SOIL PLACED OVER 7HE FILTER FABRIC AND COMPACT. 7HOROUGH
COMPACTION OF THE BACKFILL IS CRITICAL TO SILT FENCE PERFORMANCE.
10. DO NOT ATTACH FILTER FABRIC TO EXIS77NG TREES.
11. NO MEASURES ARE TO BE REMOVED UN77L DENR APPROVAL.
INSTALLA77ON SPECIFICA77ONS
1. 7HE BASE OF BOTH END POSTS SHOULD BE AT LEAST ONE FOOT HIGHER 7HAN 7HE MIDDLE OF
7HE FENCE. CHECK WITH A LEVEL IF NECESSARY.
2. INSTALL POSTS 4 FEET APART IN CRI77CAL AREAS AND 6 FEET APART ON STANDARD
APPLICA TONS.
J. INSTALL POSTS 2 FEET DEEP ON 7HE DOWNS7REAM SIDE OF 7HE SILT FENCE, AND AS CLOSE AS
POSSIBLE TO 7HE FABRIC, ENABLING POSTS TO SUPPORT THE FABRIC FROM UPSTREAM WATER
PRESSURE.
4. INSTALL POSTS Wl7H THE NIPPLES FACING AWAY FROM THE SILT FABRIC.
5. ATTACH 7HE FABRIC TO EACH POST Wl7H THREE TIES, ALL SPACED Wl7HIN THE TOP 8 INCHES
OF FABRIC. ATTACH EACH TIE DIAGONALLY 45 DEGREES THROUGH THE FABRIC WITH EACH
PUNCTURE AT LEAST 1 INCH VER77CALLY APART. ALSO, EACH 77E SHOULD BE POSITIONED TO HANG
ON A POST NIPPLE WHEN TIGHTENED TO PREVENT SAGGING.
6. WRAP APPROXIMATELY 6 INCHES OF FABRIC AROUND 7HE END POSTS AND SECURE Wl7H 3 77ES
7. NO MORE 7HAN 24 INCHES OF A 36 INCH FABRIC IS ALLOWED ABOVE GROUND LEVEL.
8. 7HE INSTALLA77ON SHOULD BE CHECKED AND CORRECTED FOR ANY DEWA77ONS BEFORE
COMPACTION.
9. COMPAC7ON IS VITALLY IMPORTANT FOR EFFEC77VE RESULTS COMPACT 7HE SOIL IMMEDIATELY
NEXT TO 7HE SILT FENCE FABRIC Wl7H THE FRONT WHEEL OF 7HE TRACTOR, SKID STEER, OR
ROLLER EXER77NG AT LEASY 60 POUNDS PER SQUARE INCH. COMPACT 7HE UPSTREAM SIDE FIRST,
AND THEN EACH SIDE TWICE FOR A TOTAL OF 4 TRIPS
MAINTENANCE
INSPECT SEDIMENT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL. MAKE ANY
REQUIRED REPAIRS IMMEDIATELY.
SHOULD 7HE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE, OR BECOME INEFFEC77VE,
REPLACE IT PROMPTLY.
REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGE VOLUME FOR THE
NEXT RAIN AND TO REDUCE PRESSURE ON 7HE FENCE. TAKE CARE TO AVOID UNDERMINING 7HE
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.
k
Skimmer
Dewatering
Riprap t
r
Device
or Slope Drain
t
�
Wky
Earthen`
embankment
Emergency
with stabilized
side slopes
Spillway
Drape baffle material overwire strand and
secure with plastic ties at posts and on wire every 12"
9 Gauge Min.High aaaammmmaaaaa,-.'�
Tension Wire Strand TMIN
Shall Be Secured
To Post To Support
Baffle Material i I
Baffle Material
If the temporary sediment basin will be
converted to a permanent stormwater basin
of greater depth, the baffle height should be
based on the pool depth during use as a
temporary sediment basin,
Note: Install three (3) coir fiber baffles in basins
at drainage outlets with a spacing of 1 /4 the
basin length. Two (2) coir fiber baffles can be
Installed in the basins less than 20 ft. in length
with a spacing of 1/3 the basin length.
POROUS BAFFLES DETAIL
(NOT TO SCALE)
Baffles
4' Max.
Compacted soil 2 `
�-� min >�
I I( II11-
-411-1.--- 6' typical
Figure 6.20a Temporary earthen diversion dike.
CONSTRUCTION SPECIFICATIONS
1. REMOVE AND PROPERLY DISPOSE OF ALL TREES, BRUSH, STUMPS, AND OTHER
OBJECTIONAL MATERIAL.
2. ENSURE THAT THE MINIMUM CONSYRUCTED 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 RAINFALL.
IMMEDIATELY REMOVE SEDIMENT FROM THE FLOW AREA AND REPAIR THE DIVERSION
RIDGE.
CHECK OUTLETS AND MAKE TIMELY REPAIRS AS NEEDED TO AVOID GULLY FORMATION.
WHEN THE AREA ABOE THE TEMPORARY DIVISERSION IS PERMANENTLY STABILIZED,
REMOVE THE DIVERSION AND FILL AND STABILIZED THE CHANNEL TO BLEND WITH THE
NATURAL SURFACE.
TEMPORARY DIVERSION DITCH
(NOT TO SCALE)
Arm Assembly
C Enclosure
Water Entry
PERSPECTIVE VIEW Unit
PVC End PVC Vent Schedule 40
Cap Elbow Yrps PVC PI
Wat
Suirface P.
PVC End r
7
Schedule 40
PVC Tee PVC Pipe PVC Pipe
}• Holes, in - PVC Tee Orifice
Vndamde Flexible Plate
�\
y e
Bottom Strfoce
END VIEW FRONT VIEW
Plan View
DW-
s nxtwe
�` F1oW
18" min 4...-r'"
6.20.1
0
• Dewatering-Allow the maximum reasonable detention pencidbefirm the
basin is completely dewatmW (at least 24 hours).
• Inflow cate-Redun, the inflow velocity and divert all sediment -bee
-ff.
Emergency
spllhm
Average _ Width W L
• Areo otbminaatwaurfacest
tep w prmdpal spllhay elevatiwt
r Freeboard Embankment
_
CONSTRUCTION SPECIFICATIONS
1. Grade the basin so that the bottom is level front to back and side to
side.
2. Install the coir fiber baffles immediately upon excavation of the basins.
Infla'ss,rac-hu'a \
icy
�
Extend 9 gauge wire to basin side or install T-postto anchor
J. Install posts across the width of the sediment trap (Practice 6.62,
baffle to side of basin and secure to vertical post
Sediment Fence).
storage". cross-saxthin
4. Steel posts should be driven to a depth of 24 inches and spaced a
view
�Jmaximum
of 4 feet apart. The to of the fabric should be a minimum of 6
P P
Flgane.64c Example ofssediment basnwhhaskknmeroudatand emergency splihNay FmmPennsylvanla
Erosion and sediment Pdmtlon Control Manual, March, 2000.
7 "I
inches higher than the invert of the spillway. Tops of baffles should be a
minimum of 2 inches lower than the top of the earthen embankment.
"
5. Install at least three rows of baffles between the inlet and outlet
6.64.6 ne.s6a
discharge point. Basins less than 20 feet in length may use 2 baffles.
Variable Depth
6. Attach a 9 gauge high tension ware strand to the steel posts at
height of 6 inches above the spillway elevation with plastic ties or wire
SKIMMER SEDIMENT BASIN
fasteners to prevent sagging. if the temporary sediment basin will be
converted to a permanent storm water basin of a greater depth, the baffle
Secure bottom ofbaffleto round Whit
g
height should be based on the pool depth during use as a temporary
basin. CONSTRUCTION SPECIFICATIONS
12"staples at 12" maximum spacing,
sediment
7. Extend 9 gauge minimum high tension wire strand to side of basin or
-'
instal/ steel T-posts to anchor baffle to side of basin and secure to 1. Clear,grub, and strip the area under the embankment of all vegetation and root mat.
9. Erosion control -Construct the structure so that the disturbed area is minimized. Divert
vertical end posts as shown in Figure 6.65b. Remove all surface soil containing high amounts of organic matter and stockpile or dispose of it
surface water away from the bare areas. Complete the embankment before the area is
i I
Steel Post
if T-0" Depth
Baffle Material should be secured to the bottom
and sides of basin using 12" landscape staples
8. Drape the coin fiber mat over the wire strand mounted at a height of 6
properly. Haul all objectionable material to the designated disposal area. Place temporary
cleared. Stabilize the emergency spillway embankment and all other disturbed areas
inches above the spillway elevation. Secure the coir fiber mat to the wire
sediment control measures below basin as needed.
above the crest of the principal spillway immediately after construction(References:
strand with plastic ties or wire fasteners. Anchor the matting to the sides
Surface Stabilization).
and floor of the basin with 12 inch wire staples, approximately 1 ft apart,
2. Ensure that fill material for the embankment is free of roots, woody vegetation, organic
along the bottom and side slopes of the basin.
matter, and other objectionable material. Place the fill in lifts not to exceed 9 inches, and
10. Install porous baffles as specified in Practice 6.65, Porous Baffles.
9. Do not splice the fabric, but use a continuous piece across the basin
machine compact it. Over fill the embankment 6 inches to allow for settlement.
10. Adjustments may be required in the stapling requirements to fit
11. After all the sediment -producing areas have been permanently stabilized, remove the
individual site conditions.
3. Shape the basin to the specified dimensions. Prevent the skimming device from settling
structure and all the unstable sediment. Smooth the area to blend with the adjoining
into the mud by excavating a shallow pit under the skimmer or providing a low support under
areas and stabilize properly. (References: Surface Stabilization).
the skimmer of stone or timber.
4. Place the barrel (typically 4-inch Schedule 40 PVC pipe) on a firm, smooth foundation of
MAINTENANCE
MAINTENANCE
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
INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH
Inspect baffles at least once a week and after each rainfall. Make any
under and around the pipe to at least the same density as the adjacent embankment. Care
SIGNIFICANT (ONE-HALF INCH OR GREATER) RAINFALL EVENT AND REPAIR
required repairs immediately.
must be taken not to raise the pipe from the firm contact with its foundation when compacting
IMMEDIATELY. REMOVE SEDIMENT AND RESTORE THE BASIN TO ITS ORIGINAL
under the pipe haunches.
DIMENSIONS WHEN SEDIMENT ACCUMULATES TO ONE-HALF THE HEIGHT OF THE
Be sure to maintain access to the baffles. Should the fabric of a baffle
FIRST BAFFLE. PULL THE SKIMMER TO ONE SIDE SO THAT THE SEDIMENT
collapse, tear, decompose, or become ineffective, rep/ace it promptly.
Place a minimum depth of 2 feet of compacted backfill over the pipe spillway before
UNDERNEATH IT CAN BE EXCAVATED. EXCAVATE THE SEDIMENT FROM THE
crossing it with construction equipment. In no case should the pipe conduit be installed by
ENTIRE BASIN, NOT JUST AROUND THE SKIMMER OR THE FIRST CELL. MAKE SURE
Remove sediment deposits when it reaches half full, to provide adequate
cutting a trench through the dam after the embankment is complete.
VEGETATION GROWING IN THE BOTTOM OF THE BASIN DOES NOT HOLD DOWN THE
storage volume for the next rain and to reduce pressure on the baffles.
SKIMMER.
Take care to avoid damaging the baffles during c/eonout, and rep/ace if
5. Assemble the skimmer following the manufactures instructions, or as designed.
damaged during cleanout operations. Sediment depth should never exceed
REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE -ANCHOR THE BAFFLES IF WATER
half the designed storage depth.
6. Lay the assembled skimmer on the bottom of the basin with the flexible joint at the inlet
IS FLOWING UNDERNEATH OR AROUND THEM.
of the barrel pipe. Attach the flexible joint to the barrel pipe and position the skimmer over the
p p p p
FIGURE 6.65b
After the contributingdrainage area has been properly stabilized, remove all
9 P P y
excavated pit or support. Be sure to attach a rope to the skimmer and anchor it to the side of
IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE
baffle materials and unstable sediment deposits, bring the area to grade,
the basin. This will be used to pull the skimmer to the side for maintenance.
REMOVED AND THE OBSTRUCTION CLEARED WITH A PLUMBER'S SNAKE OR BY
and stabilize it.
FLUSHING WITH WATER. BE SURE AND REPLACE THE ORIFICE BEFORE
7. Earthen spillways -Install the spillway in undisturbed soil to the greatest extent possible.
REPOSITIONING THE SKIMMER.
The achievement of planned elevations, grade, design width, and entrance and exit channel
slopes are critical to the successful operation of the spillway. The spillway should be lined with
CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED
laminated plastic or impermeable geotextile fabric. The fabric must be wide and long enough to
REPAIRS WITH FABRIC THAT SPANS THE FULL WIDTH OF THE SPILLWAY. CHECK
cover the bottom and sides and extend onto the top of the dam for anchoring in a trench. The
THE EMBANKMENT,SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, AND INSPECT
50 Right-of-way
edges may be secured with 8-inch staples or pins. The fabric must be long enough to extend
THE EMBANKMENT FOR PIPING AND SETTLEMENT. MAKE ALL NECESSARY REPAIRS
down the slope and exit onto the stable ground. The width of the fabric must be one piece, not
IMMEDIATELY. REMOVE ALL TRASH AND OTHER DEBRIS FROM THE SKIMMER AND
joined or spliced; otherwise water can get under the fabric. If the length of the fabric is
POOL AREAS.
insufficient for the entire length of the spillway, multiple sections, spanning the complete width,
may be used. The upper section(s) should overlap the lower section(s) so that water cannot
FREEZING WEATHER CAN RESULT IN ICE FORMING IN THE BASIN. SOME SPECIAL
35' 6'
5' 4'
flow under the fabric. Secure the upper edge and side of the fabric in a trench with staples or
PRECAUTIONS SHOULD BE TAKEN IN THE WINTER TO PREVENT THE SKIMMER
pins. (Adapted froms i ing,stalling and Maintaining Skimmer Sediment
Manual for e
FROM PLUGGING WITH ICE.
Pavement
99 &
8. Inlets - Discharge water into the basin in a manner to prevent erosion. Use temporary
Slope As Required
slope drains or diversions with outlet protection to divert sediment -laden water to the upper end
�. �B
of the pool area to improve basin trap efficiency. (References: Runoff Control Measures and
Outlet Protection).
2" S-9.5 B Superpave Asphalt Mix (optional)
8" ABC, Type B
SECTION AA
TYPICAL CUL-DE-SAC
NO CURB & GUTTER
Not To Scale
as
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