SW6231203_Plansheet - SCM Detail_20240813 (2)

PVC VENT SCHEDULE 40
I _ PVC END PIPE PVC PIPE
TEMPORARY DRAINAGE CAP PVC ELBOW
S CHANNEL #5 _
_ FILTER BAG WATER SURFACE
z PVC END •,�
� I \� CAP
D = I 50' WETLAND AND STREAM BUFFER;
J TO REMAIN UNDISTURBED PVC TEE
w o 5 - ,� � � ' -_ . . • • �• t��2+ 1/2"CHOLEE IN ORIFICE PLATE
w + ► UNDERSIDE PVC TEE
z D o 6" DIAMETER RIP RAP ��'►�' ':
FLOW
I
m APRONS AT AREAS OF \ \ �� °FILTER .BAG'
I D "'.ti'' 't I
CONCENTRATED FLOW :. ..'..:., SCHEDULE 40 Q
m \ 36" DIAMETER METAL RISER � ''' ' PVC PIPE
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AND SCH 40 2.5" 0 --
z \ SKIMMER (2.50" ORIFICE) •��'�' enne - ^� W
m 'Gs \ PUMP DISCHARGE HOSE 12 IN MIN.
6s MULCH, LEAF/WOOD COMPOST,
\ �6 PLAN VIEW WOODCHIPS, SAND, OR STRAW BALES
�s STRAP
FLOW SLOPE
v V 2� �^ 5% MAX.s :.<:,
FLEXIBLE
\ '�, \ HOSE
I \ 9 ELEVATION FILTER BAG
8 IN MIN.
Lo
CONSTRUCTION SPECIFICATIONS U
o / �`,9 \ 1. TIGHTLY SEAL SLEEVE AROUND THE PUMP DISCHARGE HOSE WITH A STRAP OR SIMILAR DEVICE. •�
APPLES
\ S� - 2. PLACE FILTER BAG ON SUITABLE BASE (E.G., MULCH, LEAF/WOOD COMPOST, WOODCHIPS, SAND, OR BOTTOM SURFACE 2
STRAW BALES) LOCATED ON A LEVEL OR 5% MAXIMUM SLOPING SURFACE. DISCHARGE TO A 1A 0
U.
STABILIZED AREA. EXTEND BASE A MINIMUM OF 12 INCHES FROM EDGES OF BAG. END VIEW FRONT VIEW �
SS CONTROL PUMPING RATE TO PREVENT EXCESSIVE PRESSURE WITHIN THE FILTER BAG IN ACCORDANCE � � u
3.
WITH E THE MANUFACTURER RECOMMENDATIONS. AS THE BAG FILLS WITH SEDIMENT, REDUCE PUMPING O Z
1 4. REMOVE AND PROPERLY DISPOSE OF FILTER BAG UPON COMPLETION OF PUMPING OPERATIONS OR ARM ASSEMBLY t °
\ \ AFTER BAG HAS REACHED CAPACITY, WHICHEVER OCCURS FIRST. SPREAD THE DEWATERED SEDIMENT g
FROM THE BAG IN AN APPROVED UPLAND AREA AND STABILIZE WITH SEED AND MULCH BY THE END 0 s
\ OF THE WORK DAY. RESTORE THE SURFACE AREA BENEATH THE BAG TO ORIGINAL CONDITION UPON "C" ENCLOSURE 0
SILT 1 1 � \ \ \ REMOVAL OF THE DEVICE. M
FENCE \ \ \ \ 5. USE NONWOVEN GEOTEXTILE WITH DOUBLE STITCHED SEAMS USING HIGH STRENGTH THREAD. SIZE
OUTLET \ \ \\ SLEEVE TO ACCOMMODATE A MAXIMUM 4 INCH DIAMETER PUMP DISCHARGE HOSE. THE BAG MUST BE
\ \ MANUFACTURED FROM A NONWOVEN GEOTEXTILE THAT MEETS OR EXCEEDS MINIMUM AVERAGE ROLL
` VALUES (MARV) FOR THE FOLLOWING:
\ \ \ \ WATER ENTRY
GRAB TENSILE 250 LB ASTM D-4632 UNIT
\ \ PUNCTURE 150 LB ASTM D-4833
�24" DIAMETER BARREL \ FLOW RATE 70GAL/MIN/FTz ASTM D-4491 PERSPECTIVE VIEW
\ PERMITTIVITY (SEC-1) 1.2 SEC- ASTM D-4491
BARREL INV. IN= 154.0' UV RESISTANCE 70% STRENGTH @ 500 HOURS ASTM D-4355 CONSTRUCTION SPECIFICATIONS:
\ APPARENT OPENING SIZE (AIDS) 0.15-0. MM ASTM 1. CLEAR GRUB AND STRIP THE AREA UNDER THE EMBANKMENT OF ALL VEGETATION AND ROOT MAT. REMOVE ALL
BARREL INV. OUT= 152.50' SEAM STRENGTH 90% ASTMSTM D-4632 >
BARREL LENGTH= 58.25 SURFACE SOIL CONTAINING HIGH AMOUNTS OF ORGANIC MATTER AND STOCKPILE OR DISPOSE OF IT PROPERLY.� 6. REPLACE FILTER BAG IF BAG CLOGS OR HAS RIPS, TEARS, OR PUNCTURES. DURING OPERATION KEEP ��`� ...•••••••••••..•••
MATERIAL- CORRUGATED METAL \ l CONNECTION BETWEEN PUMP HOSE AND FILTER BAG WATER TIGHT. REPLACE BEDDING IF IT BECOMES HAUL ALL OBJECTIONABLE MATERIAL TO THE DESIGNATED DISPOSAL AREA. PLACE TEMPORARY SEDIMENT �.�� .-•� S�
DISPLACED. CONTROL MEASURES BELOW BASIN AS NEEDED.
2. ENSURE THAT FILL MATERIAL FOR THE EMBANKMENT IS FREE OF ROOTS, WOODY VEGETATION, ORGANIC MATTER, _ <•;
\\ ass -7 \ °� STANDARDS AND SPECIFICATIONS FOR SOIL EROSION AND SEDIMENT CONTROL AND OTHER OBJECTIONABLE MATERIAL. PLACE THE FILL IN LIFTS NOT TO EXCEED 9 INCHES, AND MACHINE s
\ �s� / COMPACT IT. OVER FILL THE EMBANKMENT 6 INCHES TO ALLOW FOR SETTLEMENT. i s 056748 t
INSTALL CULVERT �sR� 'ss's>s�s91s �s \ U.S. DEPARTMENT OF AGRICULTURE NATURAL RESOURCES CONSERVATION SERVICE - 2011 3. SHAPE THE BASIN TO THE SPECIFIED DIMENSIONS. PREVENT THE SKIMMING DEVICE FROM SETTLING INTO THE MUD 's<`°: Q-'`O'
OUTLET PROTECTION AT > s�\ 8 \ \/ BY EXCAVATING A SHALLOW PIT UNDER THE SKIMMER OR PROVIDING A LOW SUPPORT UNDER THE SKIMMER OF ., (i ••..,,•. �
BARREL OUTLET (SEE \ \��s \ STONE AND TIMBER. ���i,R.q -""--�►P�O`
> \ S „ R
SHEET CG502 FOR \ \ / 4. PLACE THE BARREL (TYP. 4 SCH. 40 PVC PIPE) ON A FIRM, SMOOTH FOUNDATION OF IMPERVIOUS SOIL. DO NOT
DETAILS) 10 \ \ USE PERVIOUS MATERIAL SUCH AS SAND, GRAVEL, OR CRUSHED STONE AS BACKFILL AROUND THE PIPE. PLACE
FILTER BAG DEWATERING DEVICE THE FILL MATERIAL AROUND THE PIPE SPILLWAY IN 4" LAYERS AND COMPACT IT UNDER AND AROUND THE PIPE
© 08/2023
TO AT LEAST THE SAME DENSITY AS THE ADJACENT EMBANKMENT. CARE MUST BE TAKEN NOT TO RAISE THE
N.T.S. PIPE FROM THE FIRM CONTACT WITH ITS FOUNDATION WHEN COMPACTING UNDER THE PIPE HAUNCHES. PLACE A M C> C> C> C>
N N N N N N
O O O O O O
45 WIDE / MINIMUM DEPTH OF 2' OF COMPACTED BACKFILL OVER THE PIPE SPILLWAY BEFORE CROSSING IT WITH a N GO CN
EMERGENCY \ ° �\ CONSTRUCTION EQUIPMENT. IN NO CASE SHOULD BE PIPE CONDUIT BE INSTALLED BY CUTTING A TRENCH o N
SPILLWAY / ^\ \ THROUGH THE DAM AFTER THE EMBANKMENT IS COMPLETE.
SEDIMENT BASIN #1 DETAILS /\ / 5. ASSEMBLE THE SKIMMER FOLLOWING THE MANUFACTURERS INSTRUCTIONS, OR AS DESIGNED.
/ 6. LAY THE ASSEMBLED SKIMMER ON THE BOTTOM OF THE BASIN WITH THE FLEXIBLE JOIN AT THE INLET OF THE w
J BARREL PIPE. ATTACH THE FLEXIBLE JOINT TO THE BARREL PIPE AND POSITION THE SKIMMER OVER THE
DESCRIPTION # EXCAVATED PIT OR SUPPORT. BE SURE TO ATTACH A ROPE TO THE SKIMMER AND ANCHOR IT TO THE SIDE OF o
CN
2 THE BASIN. THIS WILL BE USED TO PULL THE SKIMMER TO THE SIDE FOR MAINTENANCE. N N N
SURFACE AREA F T 2 0,5 6 8 Practice Standards and Specifications 0 0 O
( ) /' \ r� 7. EARTHEN SPILLWAYS - INSTALL THE SPILLWAY IN UNDISTURBED SOIL TO THE GREATER EXTENT POSSIBLE. THE N N
3 / ' , �j 30 15 7.5 0 30 ACHIEVEMENT OF PLANNED ELEVATIONS, GRADE, DESIGN WIDTH, AND ENTRANCE AND EXIT CHANNEL SLOPES ARE - Ln N
STORAGE VOLUME (FT ) 22,614 •Dewatering-Allow the maximum reasonable detention period before the CRITICAL TO THE SUCCESSFUL OPERATION OF THE SPILLWAY. THE SPILLWAY SHOULD BE LINED WITH LAMINATED 2 � �
/ / basin is completely dewatered(at least 48hours). Ei GO
PLASTIC OR IMPERMEABLE GEOTEXTILE FABRIC. THE FABRIC MUST BE WIDE AND LONG ENOUGH TO COVER THE = 0 0
1"=30' • Inflow rate-reduce the inflow velocity and divert all sediment-free BOTTOM AND SIDES AND EXTEND ONTO THE TOP OF THE DAM FOR ANCHORING IN A TRENCH. THE EDGES MAY Ln N Cn
runoff. BE SECURED WITH 8" STAPLES OR PINS. THE FABRIC MUST BE LONG ENOUGH TO EXTEND DOWN THE SLOPE AND z z z
SEDIMENT BASIN #1 PLAN VIEW EXIT ONTO STABLE GROUND. THE WIDTH OF THE FABRIC MUST BE ONE PIECE, NOT JOINED OR SPLICED;
OTHERWISE WATER CAN GET UNDER THE FABRIC. IF THE LENGTH OF THE FABRIC IS INSUFFICIENT FOR THE ENTIRE z O M O o
O U o U U
LENGTH OF THE SPILLWAY, MULTIPLE SECTIONS, PLANNING THE COMPLETE WIDTH, MAY BE USED. THE UPPER � o- CN � �
SCALE: 1" = 30' Plan View SECTIONS) SHOULD OVERLAP THE LOWER SECTIONS) SO THAT WATER CANNOT FLOW UNDER THE FABRIC. w � 4Z W �
SECURE THE UPPER EDGE AND SIDES OF THE FABRIC IN A TRENCH WITH STAPLES OR PINS. of � � � �
SEDIMENT BASIN #1 SECTIONAL VIEW I 8. INLETS - DISCHARGE WATER INTO THE BASIN IN A MANNER TO PREVENT EROSION. USE TEMPORARY SLOPE � � z
DRAINS OR DIVERSIONS WITH OUTLET PROTECTION TO DIVERT SEDIMENT-LADEN WATER TO TEH UPPER END OF THE N o o 0
POOL AREA TO IMPROVE BASIN TRAP EFFICIENCY. m Ln J `� `�
Inflow Y 9. EROSION CONTROL - CONSTRUCT THE STRUCTURE SO THAT THE DISTURBED AREA IS MINIMIZED. DIVERT SURFACE <
5 MINIMUM BASIN LENGTH STORMWATER structure c � � Q Q Q
TOP OF EMBANKMENT"A"I _R="°FF I w WATER AWAY FROM BARE AREAS. COMPLETE THE EMBANKMENT BVEFORE THE AREA IS CLEARED. STABILIZE THE o O U Ln V)
EMERGENCY SPILLWAY EMBANKMENT AND ALL OTHER DISTURBED AREAS ABOVE TEH CRFEST OF THE PRINCIPAL o 0
EMERGENCY SPILLWAY"B" __ C'J L+J 0r Cl
(SEE DETAIL) 10-YR WATER SURFACE ELEVATION "C" t -
__ SPILLWAY IMMEDIATELY AFTER CONSTRUCTION. > > o � o 0
RISER CREST "D" �� j 10. INSTALL POROUS BAFFLES AS SPECIFIED IN BAFFLE DETAIL. v v
• (SEE DETAIL)EARTHEN DAM SKIMMER 11. AFTER ALL THE SEDIMENT-PRODUCING AREAS HAVE BEEN PERMANENTLY STABILIZED, MOVE TEH STRUCTURE AND -
PRINCIPLE �_ BAFFLE HEIGHT"E" \ ALL THE UNSTABLE SEDIMENT. SMOOTH THE AREA TO BLEND WITH THE ADJOINING AREAS AND STABILIZE
SILT FENCE N �'
ANTI-SEEP COLLAR (SE DETAIL)
DETAIL) D Skimmer
/r 1 SPILLWAY
OUTLET / \ dewatering PROPERLY.
/ --- 1 SKIMMER ORIFlCE ELEVATION "F" E �'` device Emergency
spillway MAINTENANCE NOTES:
BARREL-_ _ BASIN BOTTOM
1. INSPECT SKIMMER SEDIMENT BASINS AT LEAST WEEKLY AND AFTER EACH SIGNIFICANT (1 INCH OR GREATER)
I I�I�I -TIT- POROUS BAFFLES IP-RAP STABILIZATION Average Area* RAINFALL EVENT AND REPAIR IMMEDIATELY. REMOVE SEDIMENT AND RESTORE THE BASIN TO ITS ORIGINAL
SILT
RISER ANTI-FLOATATION - - (DO N(5 ESDETAIL)ENCE) T _/width w L 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 <
" Area of basin water surface at Baffles
TRASH RACK AND PRINCIPLE SPILLWAY DETAIL top of principal spillway elevation ENTIRE BASIN, NOT JUST AROUND THE SKIMMER OR THE FIRST CELL. MAKE SURE THE VEGETATION GROWING IN J
0 Z
ANTI-VORTEX DEVICE THE BOTTOM OF THE BASIN DOES NOT HOLD DOWN THE SKIMMER. C/)
EMERGENCY SPILLWAY DETAIL WEIR 2. REPAIR THE BAFFLES IF THEY ARE DAMAGED. RE-ANCHOR BAFFLES IF WATER IS FLOWING UNDERNEATH OR N
RIP-RAP, 6-INCH CLASS B AROUND THEM. F- Q
I'Freeboard Embankment 3. IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE IS WATER IN THE BASIN, USUALLY JERKING ON THE ROPE • H
Inflow Baffles � - W
GEOTEXTILE FABRIC ~ F�H = RISER HEIGHT 4.0' structure WILL MAKE THE SKIMMER BOB UP AND DOWN AND DISLODGE THE DEBRIS AND RESTORE FLOW. IF THIS DOES NOT m N 0
3.0' 1 __ WORK, PULL THE SKIMMER OVER TO THE SIDE OF THE BASIN AND REMOVE THE DEBRIS. ALSO CHECK THE I
1 - RISER2 = RISER DIAMETER ORIFICE INSIDE THE SKIMMER TO SEE IF IT IS CLOGGED; IF SO REMOVE THE DEBRIS. W z
SIZE TO FIT
�zl I = ORIFICE DIAMETER SKIMMER HOSE DewaterIng - 6"m .invert elevation of 4. IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THE ORIFICE CAN BE REMOVED AND THE OBSTRUCTION J Q
III I I i zOr1e _ emergency Spillwa
=III=III=III- ,,I-I I II I I- q-, d V� = WEIR INVERT HEIGHT 3.5' y CLEARED WITH A PLUMBER'S SNAKE OR BY FLUSHING WITH WATER. BE SURE AND REPLACE THE ORIFICE BEFORE N �
Emergency w m
I_ 20 Filter fabric spillway REPOSITIONING THE SKIMMER. J �
�-III-III-III- _ 1 I I I SPILLWAY WIDTH 45.0' d = BARREL DIAMETER 5. CHECK THE FABRIC LINED SPILLWAY FOR DAMAGE AND MAKE ANY REQUIRED REPAIRS WITH FABRIC THAT SPANS Lv J Lv
-I I I-I I I-I I I-I I I-I I I=I I I=I I I=I I I-I 1711711 I-I 15 Sediment Cross-Section g
storage zone THE FULL WIDTH OF THE SPILLWAY. CHECK THE EMBANKMENT, SPILLWAYS, AND OUTLET FOR EROSION DAMAGE, Q U'
-I I I-III=III-III-III-III-III-III-III-III=III-�I INSTALL SKIMMER INTO ORIFICE View Z
III=III=III=III=III-III=III-III=III-III-III= c AND INSPECT THE EMBANKMENT FOR PIPING AND SETTLEMENT. MAKE ALL NECESSARY REPAIRS IMMEDIATELY.
'1-III=III-III-III-III-III-III-III-III=1' BARREL Figure6.64c Example of a sediment basin with a skimmer outlet and emergency spillway. From Pennsylvania REMOVE ALL TRASH AND OTHER DEBRIS FROM THE SKIMMER AND POOL AREAS. z
III=III=III=III=III=III=III=III- Erosion and Sediment Pollution Control Manual,March,2000. 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. o
SEDIMENT BASIN #1 DESIGN TABLE D- 0
e Skimmer Average
Sediment Basin Skimmer Skimmer Skimmer Daily Dewatering No. of Rev.5/13 6.64.7 SKIMMER DEWATERING DEVICE DRAWN BY: REA
"A" "B" "C" "D" "E" "F" "G" Discharge Capacity Discharge Rate CHECKED BY: LRH
Name/Number Size (in.) Orifice (in.) FT�3 DAY CFS Time (Days)Skimmers N.T.S. APPROVED BY: LRH
1 159.5'158.5'158.0'158.0' 3.0' 154.0'154.0' 2.5" 2.50" 6,362 0.074 3.55 1
DATE: 08/04/2023
SCALE: AS SHOWN
SKIMMER BASIN (TYP.) REFERENCES FILE NUMBER: 12548SCG
CONSTRUCTION SEQUENCE, LEGEND, AND NOTES..................CGO02 SHEET:
N.T.S. CG401