NCG130090_ESC E-D007836-STWS00000 S12 R2 Email Att_20190221

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1 INLET ZONE 25%
OF SURFACE AREA
SEE BAFFLE DETAIL O;r"
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EARTH BERM
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ISOMETRIC
MAINTENANCE NOTES:
1.14'-0" MAX SPACING
TYPICAL
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BAFFLE ELEVATION
T-0" STEEL POST
FLOW
8"x6" TRENCH BACKFILL,
COMPACTED DENSE AND
FABRIC BURIED IN TRENCH
BAFFLE SECTION
INSPECT WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS. IMMEDIATELY MAKE ALL NEEDED REPAIRS
REMOVE SEDIMENT WHEN IT REACHES HALF THE HEIGHT
OF THE BAFFLE
POROUS BAFFLE
INLET ZONE 25%
OF SURFACE AREA
FIRST CHAMBER 25%
OF SURFACE AREA
SECOND CHAMBER 25%
OF SURFACE AREA
EXTEND BAFFLES UP SIDES
AS TO NOT ALLOW FLOW
AROUND THE ENDS
OUTLET STRUCTURE
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WITH FABRIC T,y sEMERGEN
SPIL WAYCY
MIN SIZE 15" CMP
12" SMOOTH WALL
STONE ENERGY
DISSIPATOR
COMPACTED
EARTHEN DAM
MAINTENANCE NOTES:
7 INSPECT WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS. IMMEDIATELY MAKE ALL NEEDED REPAIRS
REMOVE SEDIMENT AND RESTORE BASIN TO ORIGINAL DIMENSIONS
WHEN SEDIMENT ACCUMULATES TO ONE-HALF THE HEIGHT OF THE
FIRST BAFFLE. CHECK SPILLWAY FOR DAMAGE AND MAKE ALL
NECESSARY REPAIRS IMMEDIATELY
0
SKIMMER W/ CLASS B STONE PAD
(4' x 4' x V MIN)
TETHER
GENERIC SKIMMER
SEDIMENT BASIN DETAILS
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NOTES:
1. DRIVE 7'-0" STEEL POST AT LEAST 24" INTO SOLID GROUND.
2. USE STAPLES V APART HORIZONTALLY AND VERTICALLY
TO ATTACH THE FILTER FABRIC TO THE WIRE FENCE.
3. MINIMUM BAFFLE SPACING IS 10'.
4. THE FLOOR OF THE BASIN IN THE OUTLET ZONE AND
BERMS SHOULD BE SEEDED IMMEDIATELY AFTER THE
BASIN IS CONSTRUCTED.
5. POROUS BAFFLE MATERIAL SHALL CONSIST OF MINIMUM
700 GRAM/SQUARE METER COIR EROSION BLANKET
MEETING OR EXCEEDING THE FOLLOWING SPECIFICATIONS:
A. THICKNESS: 0.30 INCH MINIMUM
B. WET TENSILE STRENGTH: 900 X 680 LB/FT
C. WET ELONGATION: 69% BY 34% MAXIMUM
D. WEIGHT: 20 OUNCES/SQUARE YARD
E. OPEN AREA: 50% MAXIMUM
6. POROUS BAFFLES SHALL BE SUPPORTED ON STEEL
POSTS SPACED AT A MAXIMUM OF FOUR FEET ALONG
ALIGNMENT OF THE BAFFLE. STEEL POSTS SHOULD
BE EMBEDDED A MINIMUM OF 2 FEET INTO THE GROUND.
7. #9 GAUGE HIGH TENSION WIRE TO BE STRUNG BETWEEN
STEEL POSTS TO PREVENT SAGGING OF BAFFLES.
HIGH TENSION WIRE SHALL BE EXTENDED TO SIDES OF
BASINS OR ANCHORED AT SIDES OF BASINS TO STEEL POSTS.
8. SECURE POROUS BAFFLE MATERIAL TO HIGH TENSION
WIRE WITH PLASTIC TIES OR WIRE FASTENERS.
9. SECURE POROUS BAFFLE MATERIAL TO BASIN FLOOR
AND SIDE SLOPES WITH 12 INCH WIRE STAPLE GROUND
ANCHORS SPACED AT 1 FOOT.
BAFFLE (3 MIN, TYP)
C
5'-0"
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TOP VIEW
MAINTENANCE NOTES:
8" PVC FLOAT
"PIPE DIA'__ SEE PLAN
z
J
a
w
w
U)
INLET - WATER ENTRY UNIT
WITH TRASH SCREEN
ALUMINUM STRAPS
SUSPENDING INLET
INSPECT WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS. IMMEDIATELY MAKE ALL NEEDED REPAIRS.
MAKE SURE VEGETATION DOES NOT HOLD THE SKIMMER DOWN.
CHECK TO SEE IF SKIMMER IS CLOGGED; IF SO, REMOVE DEBRIS.
TAKE SPECIAL PRECAUTIONS DURING WINTER TO PREVENT THE
SKIMMER FROM PLUGGING WITH ICE.
u
MAINTENANCE NOTES:
INSPECT WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS. IMMEDIATELY MAKE ALL NEEDED REPAIRS
RIP RAP OUTLET
PROTECTION
"FOR PIPE DIA SEE PLAN
2" VENT WITH ORANGE TIP
AND 90' ELBOW
/1 6" HEAD ON CENTER
OF INLET AND ORIFICE
- — - - I PVC FLOAT
Cyt INLET - WATER ENTRY UNIT
INLET - WATER ENTRY UNIT
WITH TRASH SCREEN
END VIEW
-- 8" INLET EXTENSION
6" SCH 40 SOLID PVC BARREL OR ARM,
SUPPLIED BY CONTRACTOR
6" HOSE, SS CLAMPS
6" THREADED MALE
NIPPLE ON OUTLET END
V VVVI LIIYV
8'.x6" BUSHING
6" SCH 80 FEMALE ADAPTOR
12" OF 6" PIPE
SIDE VIEW
SKIMMER DEWATERING DESIGN CRITERIA
SUMMARY:
SEDIMENT BASIN (8" SKIMMER W/ 6" ORIFICE)
PRIMARY SPILLWAY:
CONCRETE RISER (OS-03) W/ OUTLET PIPE, (SEDIMENT BASIN)
DRAINAGE AREA:
16.98 ACRES
BASIN STORAGE VOLUME:
170,126 CUBIC FEET (SEDIMENT BASIN)
36,861 CUBIC FEET (ATTENUATION BASIN)
DEWATERING MECHANISM:
SKIMMER ATTACHED TO BOTTOM OF RISER
MINIMUM DEWATERING TIME:
48 HOURS
6" ORIFICE DEWATERING TIME:
51,840 CUBIC FEET PER DAY
BARREL SIZE:
6" DIAMETER
ARM LENGTH:
10'-6" (1.5 X DEPTH)
" SKIMMER SIZED TO INCLUDE ATTENUATION BASIN VOLUME THAT WILL DISCHARGE
INTO SEDIMENT BASIN AT APPROXIMATELY THE SAME RATE AS SEDIMENT BASIN
DEWATERS THROUGH SKIMMER
FAIRCLOTH SKIMMER® DETAILS
IF SLOPE EXCEEDS 2(H):1(V),
REINFORCE SLOPE ABOVE
CULVERT INLET/OUTLET
WITH SAME SPILLWAY RIP RAP
DETAIL
CLASS 2 RIP RAP PER PLANS
THICKNESS = 1.5 x D MAX
DMAX =1.5xD50
(Deo =14") -
2
VARIES
BOTTOM & SIDE SLOPES)
HDPE FLARED END SECTION
(LENGTH & DIAMETER VARIES,
SEE PLAN)
6" THICK LAYER OF 1.5" DIA
CRUSHED ROCK ON
GEOTEXTILE FABRIC
MIRAFI 140N OR APPROVED EQUAL
SECTION 13
S00000
12
CLASS 2 RIP RAP PER
NCDOT SECTION 1042
(D50 =14")
SEE PLAN -
— I —
jlH,Fv
FILTER FABRIC - MIRAFI 140N
OR APPROVED EQUAL
MAINTENANCE NOTES:
INSPECT WEEKLY AND AFTER SIGNIFICANT (1/2 INCH OR GREATER)
RAINFALL EVENTS. IMMEDIATELY MAKE ALL NEEDED REPAIRS
MAINTAIN ALL VEGETATION ADJACENT TO THE CHANNEL IN A HEALTHY,
VIGOROUS CONDITION
TYPICAL RIP RAP
LINED CHANNEL
TRAPEZOIDAL
GENERAL NOTES
1. FOR REFERENCE DRAWINGS SEE SHEET 01.
ISSUED FOR CONSTRUCTION
ISSUED FOR PHASE 2 PERMIT APPLICATION
5/ /18
MPL
TJS
GPL
JRH
ISSUED FOR PHASE 2 PERMIT APPLICATION
03/23/18
REVISION
I DATE
DR/DNR
ORENG
TSCK
ENGC
DUKE
ENERGY®
2'S DRAWING NUMBER
BAB-16438-00-C-300
112
ZACHRY
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ZACHRY ENGINEERING CORPORATION - 255 EAST HEBRON STREET, CHARLOTTE, NC 28273
NORTH CAROLINA BOARD OF EXAMINERS FOR ENGINEERS LICENSE #F-1171
ZACHRY GROUP - 527 LOGWOOD AVENUE, SAN ANTONIO, TX 78221
THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION OF ZACHRY ENGINEERING CORPORATION ("ZACHRY').
ALL RIGHT, TITLE AND INTEREST IN AND TO THIS DOCUMENT, INCLUDING ALL INFORMATION CONTAINED IN
THIS DOCUMENT, SHALL BE GOVERNED BY THE APPLICABLE CONTRACT BETWEEN ZACHRY AND ITS CUSTOMER
CAR 7��
N THE ABSENCE OF SUCH A CONTRACT, IS HEREBY RETAINED BY ZACHRY. IS DOCUMENT IS NOT
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NTTEI DED OR REP ESEEN ED TO BE SSU T BLE FOR ANY UNAUTHORIZED USE OR REUSE.
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