18-Detail Sheets-401-Details

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BY OTHERS
BRIDGE PLAN
T/GRADE
0
v
CROSS SECTION A -A
5'-0"
TOP
OF DAM
NOTES:
• MEASUREMENTS ARE TO THE INSIDE
CRESTS OF THE CORRUGATION
• DIMENSIONS ARE SUBJECT TO
MANUFACTURING TOLERANCES
NOTE:
THE SETTLING PONDS WILL BE REMOVED WHEN THE
RECLAMATION PLAN IS COMPLETED IN THE FIELD.
Q
100' WIDTH
TOP OF BERM
WATER SURFACE ELEVATION = 595 FT
FOUNDATION 1L ELEVATION = 594 FT � 1
BY OTHERS 2.5 1 1 2.5
BOTTOM
ELEVATION
= 579
TAILING POND #1
*PRELIMINARY FOUNDATION DESIGN NOTES:
• PRELIMINARY SIZING BASED ON
ASSUMED 8000 PSF BEARING CAPACITY,
4'-1" OF COVER, AND CAT 773 LIVE
LOADING
• SCOUR NOT CONSIDERED IN THIS
PRELIMINARY DESIGN
• FINAL DESIGN MAY VARY
CONTECH METAL ARCH BRIDGE CULVERT
NTS
18"
RETRIEVAL ROPE SKIMMER
PROTECT WEIR WITH FILTER
FABRIC AND RIPRAP
FILTER FABRIC 3 o
w CD D-
� M
4" OR 6" PVC
5'x3'x18"
6" STONE APRON
WITH FILTER FABRIC
NOTES:
1. USE FOR DRAINAGE AREAS NOT EXCEEDING FIVE ACRES.
2. EARTH BERM SHALL BE STABILIZED w/SEEDING ACCORDING TO
TOWN SPECIFICATIONS.
DESIGN OF
SPILLWAYS
DRAINAGE AREA
WEIR LENGTH 1
(ACRES)
(FT)
1
4.0
2
6.0
3
8.0
4
10.0
5
12.0
1DIMENSIONS SHOWN ARE MINIMUM
FILTER FABRIC
BAFFLES WITH METAL T-POST,
WOVEN WIRE FABRIC BACKING
AND COIR FIBER NETTING
�T z i �-II=1I1-1I1� 11-1II=1II-1II=1II-1II=1_
-1�1 ICI III III ICI III III III III- I
LENGTH
SKIMMER BASIN CROSS SECTION
LINE WEIR WITH RIPRAP
WEIR
LENGTH
PVC I -III -III -III -III -III='
I II PIPE I111-111-I11111 11i111-
11� I�IIIIIII111IIIIIIIIIi�
WEIR CROSS SECTION
DITCH AND BURY
FILTER FABRIC EDGE
(MIN. 12" OF FABRIC)
MAINTENANCE
• INSPECT TEMPORARY SKIMMER BASIN AND EMPTY SKIMMER OF ALL DEBRIS AFTER EACH PERIOD OF SIGNIFICANT RAINFALL. REMOVE
SEDIMENT AND RESTORE BASIN TO ITS ORIGINAL DIMENSIONS WHEN THE SEDIMENT HAS ACCUMULATED TO ONE-HALF THE DESIGN
DEPTH OF THE BASIN. PLACE THE SEDIMENT THAT IS REMOVED IN A DESIGNATED DISPOSAL AREA. REPAIR BAFFLES.
• CHECK THE STRUCTURE FOR DAMAGE FROM EROSION OR PIPING. PERIODICALLY CHECK THE DEPTH OF THE SPILLWAY TO ENSURE IT
IS A MINIMUM OF 1.5 FEET BELOW THE LOW POINT OF THE EMBANKMENT. IMMEDIATELY FILL ANY SETTLEMENT OF THE EMBANKMENT
TO SLIGHTLY ABOVE DESIGN GRADE. ANY RIPRAP DISPLACED FROM THE SPILLWAY MUST BE REPLACED IMMEDIATELY.
• STABILIZE THE EMBANKMENT AND ALL DISTURBED AREAS ABOVE THE SEDIMENT POOL AND DOWNSTREAM FROM THE BASIN IMMEDIATELY
AFTER CONSTRUCTION WITH SEEDING AND MATTING, AS NEEDED.
TEMPORARY SKIMMER BASIN (2 OF 2
NTS
100' WIDTH
10, �_ i TOP OF BERM
WATER SURFACE ELEVATION = 591 FT
255
11F ELEVATION = 584 FT -1 12 5
BOTTOM
ELEVATION56 F7
TAILING POND #2
NOTE:
EACH TAILING POND SHALL HAVE A MINIMUM FREEBOARD OF
1.0 FEET AND SHALL HAVE DIMENSIONS AT THE SURFACE OF
500 FEET LONG BY 100 FEET WIDE.
THE SLOPES OF THE OUTER SIDES OF THE TAILING PONDS
WILL VARY DEPENDING ON THE SURROUNDING SURFACE.
TAILING POND DETAIL
NTS
BAFFLES WITH METAL T-POST, WOVEN WIRE
FABRIC BACKING AND COIR FIBER NETTING -
SEE BAFFLE DETAIL
(THIS SHEET)
BOTTOM ANCHORED
WITH STAPLES
SKIMMER WITH RETRIEVAL ROPE
TOP OF
DAM 5'-0"--, ,
WEI
STONE APRON
WITH FILTER FABRIC
sFo�M��r
PERSPECTIVE VIEW
TEMPORARY SKIMMER BASIN (1 OF 2
NTS
NOTES:
1. SKIMMER IS TO BE A SURFACE DEWATERING DEVICE
SUCH AS BMP SKIMMER OR APPROVED DEVICE.
2. SKIMMER SHOULD RISE TO LEVEL OF WEIR HEIGHT IN
TEMPORARY BASIN OR TO RISER INLET.
3. ROPE ATTACHED TO SKIMMER TO HELP KEEP CLEAN.
4. SIZING OF ORIFICE TO ALLOW FOR DEWATERING TIME
OF 24-72 HOURS.
RIGID FLEXIBLE JOINT
OUTLET END: CONNECTIO
TO OUTLET PIPE OR RIS
SKIMMER DETAIL
NTS
NOTES:
1. DRIVE STEEL FENCE POST AT LEAST 18
INCHES INTO SOLID GROUND.
2. WOOD POST ARE NOT ACCEPTABLE.
3. DIRECT WATER TO TOP OF BASIN USING
STABILIZED DITCH, SLOPE DRAIN PIPE
OR OTHER APPROVED METHOD.
BAFFLE DETAIL
CORR FIBER MATTING.
SECURE WITH NYLON
ZIP TIES.
36"
MIN.
ZIP TIES I
FLOW DIRECTION STAPLES
WOVEN WIRE FABRIC - MIN.
SECURE WITH NYLON ZIP TIESI
T-POST
Uf11\I\LL rlrL LVIVVLI\ II If11V JIIV YYIV.
NOT INCLUDED WITH SKIMMER SUPPLIED BY USER.
)PE
615 St. George Square
Suite 300
Winston-Salem, NC 27103
336-842-4065
C#0430
label lapc.com
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© 2019 LaBella Associates
ALAMANCE
AGGREGATES, LLC
Mr. Chad Threatt, VP
Alamance County Mine
N0: DATE: DESCRIPTION:
REVISIONS
PROJECT NUMBER:
2180544
DRAWN BY: KCG/ATC
REVIEWED BY: PAS
ISSUED FOR:
REVIEW
DATE:
5/8/19
DRAWING NAME
DRAWING NUMBER:
SITE DETAILS
C401