SW3210801_Plansheet C3.9-12 - SCM Detail_20220128

GRAVEL
FACING
30 0 15
PLANT SCHEDULE
nRNAMFNTAI GRASSFS ANn rRnUNnCnVFRS
GRAPHIC SCALE
30 60
( IN FEET )
1 inch = 30 ft.
QNTY
ABBRV
TQP
LQP
SCIENTIFIC NAME
COMMON NAME
PLANTING SIZE
SPACING
MISCELLANEOUS / REMARKS
1161
ASIN
0
0
Asclepius incarnafa
Swamp Milkweed
CONT 4" POTS
2'
Full and well formed
1414
HIBC
0
0
Hibiscus coccineus
Scarleft Rose Mallow
CONT 4" POTS
2'
Full and well formed
1479
LOCA
0
0
Lobelia cardinalis
Cardinal Flower
CONT 4" POTS
2'
Full and well formed
NOTE:
PLANT QUANTITIES ARE TOTAL FOR ALL FOUR PONDS.
PLAN VIEW
2' MN.
CROSS-SECTION
120
PROVIDE
WATERTIGHT
CONNECTION
12" THICK (MIN.)
CAST -IN -PLACE OR PRECAST
CONCRETE COLLAR
(MIN. 2000 PSI)
ANTI -SEEP
COLLAR
SPECIFICATIONS
PIPE
RISER TO
ID
DIA
S
NO OF
FIRST
(IN)
(IN)
COLLARS
COLLAR
(FT)
WET POND
36
72
I
25
01
NOTES:
1. ALL COLLARS SHALL BE INSTALLED TO BE
WATER -TIGHT.
2. COLLAR DIMENSIONS TO EXTEND 18" (MIN) BEYOND
SPECIFIED PIPE DIAMETER ON ALL SIDES.
3. FIRST ANTI -SEEP COLLAR TO BE LOCATED SLIGHTLY
DOWNSTREAM OF DAM CENTER LINE.
A
SAFETY FENCE
(ALONG PERIMETER)
STORMWgTER
R U�►
COMPACTED SOIL (CLAY) LINER
SPECIFICATIONS
THE BMP POND SHALL INCLUDE A COMPACTED
SOIL LINER. THE EARTHWORK CONTRACTOR SHALL
FURNISH ALL LABOR, MATERIAL, SUPERVISION, AND
EQUIPMENT TO COMPLETE THE COMPACTED SOIL
LINER FOR THE POND INCLUDING THE FOLLOWING
OPERATIONS: HAULING, SIEVING, RAKING, DISCING,
COMPACTING, DRYING, WETTING, REMOVAL OF
RAINWATER, REMOVAL OF ALL PREVIOUSLY PLACED
MATERIAL RENDERED UNSUITABLE DUE TO
WEATHER CONDITIONS OR CONSTRUCTION
OPERATIONS, FINAL GRADING AND SEALING, AND
ALL NECESSARY AND INCIDENTAL ITEMS AS
DETAILED OR REQUIRED TO COMPLETE THE
COMPACTED LINER.
SOIL LINER FILL MATERIALS ARE POTENTIALLY
ON -SITE. ON -SITE SOILS THAT MEET THE
FOLLOWING REQUIREMENTS SHALL BE CLASSIFIED
AS SOIL LINER FILL MATERIAL AND MAY BE USED
IN THE CONSTRUCTION OF THE COMPACTED SOIL
LINER:
1. LIQUID LIMIT, PLASTICITY INDEX, AND PERCENT
PASSING THE NO. 200 SIEVE WILL BE
CONSIDERED FOR PROPER CLASSIFICATION. THE
SOIL LINER MATERIAL SHALL HAVE A PLASTICITY
INDEX GREATER THAN 20 OR AS SUBSEQUENTLY
SPECIFIED BASED ON LABORATORY TESTING, AND
HAVE A SOIL PERMEABILITY OF 1 E-5 CM/SEC
OR SLOWER AS DETERMINED BY SOIL
PERMEABILITY (ASTM D5084).
2. SOIL LINER FILL MATERIALS SHALL BE
REASONABLY FREE OF GYPSUM, FERROUS,
AND/OR CALCAREOUS CONCRETIONS AND
NODULES OR OTHER DELETERIOUS SUBSTANCES.
SOIL LINER MATERIAL SHALL BE RAKED OR
SIEVED BY THE EARTHWORK CONTRACTOR, IF
NECESSARY, TO REMOVE ALL AGGREGATE
GREATER THAN 1 INCH IN DIAMETER. NO MORE
THAN 5 PERCENT OF THE SOIL LINER FILL
MATERIAL SHOULD BE RETAINED IN THE NO. 4
SIEVE.
3. PRIOR TO COMPACTION, ALL CLAY CLODS WILL
BE BROKEN DOWN WITH TILLERS AND/OR DISCS
TO PROVIDE A HOMOGENEOUS CLAY SOIL THAT
IS FREE OF CLAY CLODS LARGER THAN 2
INCHES IN DIAMETER.
CONSTRUCTION
1. CONSTRUCTION METHODS, SAMPLING AND
TESTING WILL BE RECOMMENDED BY THE
GEOTECHNICAL. TYPICAL TESTS TO BE INCLUDED
ARE MOISTURE CONTENT, IN -PLACE DENSITY,
ATTERBERG LIMITS AND PERMEABILITY TESTING..
2. PRIOR TO SOIL LINER PLACEMENT, THE
PREPARED SUBGRADE SHALL BE PROOFROLLED
WITH A LOADED DUMP TRUCK (MIN. 20 TONS)
OR SIMILAR RUBBER TIRED PNEUMATIC VEHICLE,
A MINIMUM OF TWO PASSES IN EACH DIRECTION.
3. LOOSE SOIL LINER FILL LIFT THICKNESS, PRIOR
TO COMPACTION, SHALL BE A MAXIMUM OF 6
INCHES. THINNER LIFTS ARE PERMISSIBLE TO
ACHIEVE DESIGN GRADE AND/OR SOIL LINER
PROPERTY SPECIFICATIONS.
4. EQUIPMENT OR TRUCK TRAFFIC SHALL NOT BE
PERMITTED DURING THE PERIOD BETWEEN
SCARIFYING AND COMPACTION OF A LIFT UNLESS
APPROVED BY THE ENGINEER.
5. SOIL LINER FILL SHALL NOT BE PLACED OR
COMPACTED DURING SUSTAINED PERIODS OF AIR
TEMPERATURES BELOW 32 DEGREES F. IF THE
SOIL LINER FILL FREEZES OR ICES THE FILL
SECTION SHALL BE RE -SCARIFIED AND
RE -COMPACTED.
6. THE COMPACTED SOIL LINER SHALL BE
CONSTRUCTED TO THE MINIMUM THICKNESS
SPECIFIED BY THE PROJECT PLANS.
7. AFTER COMPLETION OF A SEGMENT OF
COMPACTED SOIL LINER, BUT BEFORE
INSTALLATION OF THE TOPSOIL PROTECTIVE
LAYER, THE SURFACE OF THE SOIL LINER SHALL
BE SURVEYED BY THE CONTRACTOR TO ENSURE
THE SPECIFIED THICKNESS OF COMPACTED SOIL
LINER.
MINIMUM MAINTENANCE SCHEDULE
1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING
RAINFALL EVENT AND AT LEAST MONTHLY:
1.1 INSPECT THE DETENTION BASIN SYSTEM
FOR SEDIMENT ACCUMULATION, EROSION, TRASH
ACCUMULATION, VEGETATED COVER, AND
GENERAL CONDITION.
1.2 CHECK AND CLEAR THE ORIFICE OF ANY
OBSTRUCTIONS THAT WOULD INTERFERE WITH
THE DRAW DOWN
OF THE TEMPORARY POOL AS DESIGNED.
2. REPAIR ERODED AREAS IMMEDIATELY. RE -SEED
THE EMBANKMENT AS NECESSARY TO MAINTAIN
GOOD VEGETATIVE COVER. MOW VEGETATIVE
COVER ON EMBANKMENT TO MAINTAIN A
MAXIMUM HEIGHT OF SIX INCHES, REMOVE
TRASH AS NEEDED.
3. INSPECT AND REPAIR THE COLLECTION SYSTEM
(I.E. CATCH BASINS, PIPING, SWALES, RIP RAP,
ETC.) QUARTERLY TO MAINTAIN PROPER
FUNCTIONING.
4. REMOVE WOODY VEGETATION NOT PART OF THE
APPROVED PLAN ALONG THE DAM EMBANKMENT.
5. REMOVE ACCUMULATED SEDIMENT FROM THE WET
DETENTION BASIN SYSTEM SEMI-ANNUALLY OR
WHEN THE DEPTH IS REDUCED TO 75% OF THE
ORIGINAL DESIGN DEPTH. REMOVED SEDIMENT
SHALL BE DISPOSED OF IN AN APPROPRIATE
MANNER AND SHALL BE HANDLED IN A MANNER
THAT WILL NOT ADVERSELY IMPACT WATER
QUALITY (I.E. STOCKPILING NEAR A WET
DETENTION BASIN OR STREAM, ETC.).
6. PERFORM ANNUAL INSPECTION OF THE BASIN
(ANNUAL INSPECTION REPORTS TO BE KEPT BY
THE OWNER). PRIOR TO INSPECTION NOTIFICATION
MUST BE GIVEN TO STORM WATER SERVICES.
NOTE
THE PRECAST MANUFACTURER IS TO PREPARE AND
SUBMIT TO THE ENGINEER DESIGN DETAILS AND
CALCULATIONS FOR THE STRUCTURES SHOWN
BASED ON THE DESIGN CRITERIA SPECIFIED. THE
DESIGN SHALL BE PERFORMED UNDER THE DIRECT
SUPERVISION AND SEALED BY A PROFESSIONAL
ENGINEER REFEREED IN THE STATE OF NORTH
CAROLINA EXPERIENCED IN THE DESIGN OF
PRECAST CONCRETE. THE DESIGN SHALL INCLUDE
PROVISION S FOR HANDLING STRESSES AND
CONSTRUCTION LOADS. REPRODUCED COPIES OF
ASTM C789 "STANDARD SPECIFICATIONS FOR
PRECAST REINFORCED CONCRETE BOX SECTIONS
FOR CULVERTS, STORM DRAINS, AND SEWERS" WILL
NOT BE ACCEPTED AS A SUBSTITUTED FOR DESIGN.
NOTE
NCDEQ WILL REQUIRE AN OPERATION AND
MAINTENANCE PLAN AND INSPECTION AND
MAINTENANCE AGREEMENT
EMBANKMENT CONSTRUCTION NOTES
GENERAL
1. THE POND AND DAM AREA SHALL BE CLEARED,
GRUBBED AND STRIPPED OF ALL VEGETATIVE
MATERIAL AND TOPSOIL PRIOR TO DAM
CONSTRUCTION, THE DISPOSAL OF TREES,
STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE
MATERIAL, ETC. SHALL NOT BE PERMITTED IN
THE DAM OR POOL AREA OF THE POND. WHEN
BLASTING IS USED TO REMOVE ROCK FROM THE
POOL AREA, THE BLASTED AREA SHALL BE
OVER -EXCAVATED TO A DEPTH OF AT LEAST
TWO FEET (2) BELOW FINISH GRADE AND
BROUGHT BACK TO FINISH GRADE WITH CLEAN
RELATIVELY IMPERVIOUS SOIL MATERIAL
COMPACTED IN PLACE.
EARTH FILL DAMS
1. SOIL MATERIALS USED FOR EARTH FILL WHICH
ARE HIGHLY PERMEABLE OR WHICH EXHIBIT
SIGNIFICANT.
2. EMBANKMENTS FILL MATERIAL TO BE COMPACTED
TO AT LEAST 95% STANDARD PROCTOR
COMPACTION.
3. SHRINKAGE SWELL, OR DISPERSION SHALL NOT
BE USED IN THE EMBANKMENT.
4.A CUTOFF TRENCH (CORE TRENCH) SHALL BE
PROVIDED WITH A MINIMUM WIDTH OF FIVE FEET
(5'). THE CENTERLINE OF THE CUTOFF TRENCH
SHALL NOT BE LOCATED DOWNSTREAM OF THE
INSIDE TOP OF SLOPE OF THE DAM. THE
CUTOFF TRENCH SHALL BE CAREFULLY
BACK -FILLED WITH HIGHLY IMPERMEABLE
MATERIAL AND COMPACTED TO AT LEAST
NINETY-FIVE PERCENT (95%) OF STANDARD
PROCTOR DENSITY.
5. THE MINIMUM TOP WIDTH OF THE DAM SHALL BE
TEN FEET (10') AND SLOPES SHALL NOT BE
STEEPER THAN 2:1 (TWO HORIZONTAL TO ONE
VERTICAL) ON THE DAM OR EMBANKMENTS
AROUND THE POND.
6. ALL DISTURBED GROUND AREAS AND
EMBANKMENTS SURROUNDING THE POND SHALL
BE MECHANICALLY STABILIZED AND HAVE
PERMANENT GROUND COVER ESTABLISHED IN
ACCORDANCE WITH THE PERMANENT SEEDING
SCHEDULE.
BMP DATA TABLE
POND
SPILLWAY
POND ELEVATIONS
ID
BOTTOM
TOP
DEPTH
LENGTH (FT)
ELEV
PERM POOL
10-YR ELEV
25-YR ELEV
50-YR ELEV
WET POND 01
758 5
770 0
II 5
N/A
N/A
764 0
767 9
7665
7668
POND SECTIONAL VIEW
BASIN LENGTH
0' MIN
_100=YR WATER SURFACE ELEVATION
=769.0
50=YR WATER SURFACE ELEVATION
= 768.8
25-YR WATER SURFACE ELEVATION =
768.5
10-YR WATER SURFACE ELEVATION
= 767.9
?
_ _ _ _ _ _ 2-YR WATER SURFACE ELEVATION =
EARTHEN DAM
766.7_ _ _ _ _ _ _ _ _ _ _ _ _ _ _
BASIN INLET-
NLVEGETATIVE SHELF
G:I SLOPE NORMAL WATER = 764.0
SEDIMENT 55'PERMANENT
TOP OF VEGETATIVE SHELF > FOREBAY POOL DEPTH STORAGE ELEV = 759.0
ELEV: 764.50 CL-STABI LI ZAI O N II RIPRAP BASIN BOTTOM = 758.5
STAB T
BOTTOM OF
VEGETATIVE SHELF
ELEV: 763.5
FOREBAY ENTRANCE
ELEV: 758.0
MIN. 2'
I�
12" CLAY LINER SHALL BE CONSTRUCTED \--ELEV:7Y EXIT
OR COMPACTED SUCH THAT INFILTRATION ELEV: 58.5
RATE IS NOT MORE THAN 0.01 IN/HR
WET DETENTION POND 1
r� 6�(TYP)
ANTI -SEEP COLLAR
SEE DETAIL.
SE
VEGETATIVE SHELF SEEPOND 2
G.I SLOPE FOR DETAILS
- - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - -
36" CLASS IV RCP
INTER CONNECTED
PIPE X 2 WITH
WATERTIGHT JOINTS
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JOB NO:
DATE:
DRAWN:
J- 29101
1-II-22
NH
DESIGNED:
NH
REVIEWED:
WBS
APPROVED:
WBS
SCALE:
I" = 30'
[C3.9
FOREBAY DAM
NOT TO SCALE
ANTI -SEEP COLLAR
NOT TO SCALE
NOT TO SCALE
SHWT TEST TO BE PREFORMED BEFORE THE POND IS CONSTRUCTED
NOTE: SEE GRADING PLAN SHEET C3 0
FOR PIPE INVERTS, PIPE SIZE, AND PIPE
LENGTHS

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\ ASIN -
HIBC ( LOCA 58
59 ` 58
767
766
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769 LOCA
HIBC I \ 58 ASIN
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TOP: 770.0 \
NWL: 764.0 \ L
BOP: 755.5
CS
INV : 76150
I 765 LOCA
/ HIBC LOCA
III) I 766 ASIN ASIN HIBC ASIN LOCA
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COMPACTED SOIL (CLAY) LINER
SPECIFICATIONS
THE BMP POND SHALL INCLUDE A COMPACTED
SOIL LINER. THE EARTHWORK CONTRACTOR SHALL
FURNISH ALL LABOR, MATERIAL, SUPERVISION, AND
EQUIPMENT TO COMPLETE THE COMPACTED SOIL
LINER FOR THE POND INCLUDING THE FOLLOWING
OPERATIONS: HAULING, SIEVING, RAKING, DISCING,
COMPACTING, DRYING, WETTING, REMOVAL OF
RAINWATER, REMOVAL OF ALL PREVIOUSLY PLACED
MATERIAL RENDERED UNSUITABLE DUE TO WEATHER
CONDITIONS OR CONSTRUCTION OPERATIONS, FINAL
GRADING AND SEALING, AND ALL NECESSARY AND
INCIDENTAL ITEMS AS DETAILED OR REQUIRED TO
COMPLETE THE COMPACTED LINER.
SOIL LINER FILL MATERIALS ARE POTENTIALLY
ON -SITE. ON -SITE SOILS THAT MEET THE
FOLLOWING REQUIREMENTS SHALL BE CLASSIFIED AS
SOIL LINER FILL MATERIAL AND MAY BE USED IN
THE CONSTRUCTION OF THE COMPACTED SOIL LINER:
1. LIQUID LIMIT, PLASTICITY INDEX, AND PERCENT
PASSING THE NO. 200 SIEVE WILL BE CONSIDERED
FOR PROPER CLASSIFICATION. THE SOIL LINER
MATERIAL SHALL HAVE A PLASTICITY INDEX
GREATER THAN 20 OR AS SUBSEQUENTLY
SPECIFIED BASED ON LABORATORY TESTING, AND
HAVE A SOIL PERMEABILITY OF 1 E-5 CM/SEC OR
SLOWER AS DETERMINED BY SOIL PERMEABILITY
(ASTM D5084).
2. SOIL LINER FILL MATERIALS SHALL BE REASONABLY
FREE OF GYPSUM, FERROUS, AND/OR CALCAREOUS
CONCRETIONS AND NODULES OR OTHER
DELETERIOUS SUBSTANCES. SOIL LINER MATERIAL
SHALL BE RAKED OR SIEVED BY THE EARTHWORK
CONTRACTOR, IF NECESSARY, TO REMOVE ALL
AGGREGATE GREATER THAN 1 INCH IN DIAMETER.
NO MORE THAN 5 PERCENT OF THE SOIL LINER
FILL MATERIAL SHOULD BE RETAINED IN THE NO.
4 SIEVE.
3. PRIOR TO COMPACTION, ALL CLAY CLODS WILL BE
BROKEN DOWN WITH TILLERS AND/OR DISCS TO
PROVIDE A HOMOGENEOUS CLAY SOIL THAT IS
FREE OF CLAY CLODS LARGER THAN 2 INCHES IN
DIAMETER.
NOTE
NCDEQ WILL REQUIRE AN OPERATION AND
MAINTENANCE PLAN AND INSPECTION AND
MAINTENANCE AGREEMENT
NOTE
THE PRECAST MANUFACTURER IS TO PREPARE AND
SUBMIT TO THE ENGINEER DESIGN DETAILS AND
CALCULATIONS FOR THE STRUCTURES SHOWN BASED
ON THE DESIGN CRITERIA SPECIFIED. THE DESIGN
SHALL BE PERFORMED UNDER THE DIRECT
SUPERVISION AND SEALED BY A PROFESSIONAL
ENGINEER REFEREED IN THE STATE OF NORTH
CAROLINA EXPERIENCED IN THE DESIGN OF PRECAST
CONCRETE. THE DESIGN SHALL INCLUDE PROVISION
S FOR HANDLING STRESSES AND CONSTRUCTION
LOADS. REPRODUCED COPIES OF ASTM C789
"STANDARD SPECIFICATIONS FOR PRECAST
REINFORCED CONCRETE BOX SECTIONS FOR
CULVERTS, STORM DRAINS, AND SEWERS" WILL NOT
BE ACCEPTED AS A SUBSTITUTED FOR DESIGN.
EMBANKMENT CONSTRUCTION NOTES
GENERAL
1. THE POND AND DAM AREA SHALL BE CLEARED,
GRUBBED AND STRIPPED OF ALL VEGETATIVE
MATERIAL AND TOPSOIL PRIOR TO DAM
CONSTRUCTION, THE DISPOSAL OF TREES,
STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE
MATERIAL, ETC. SHALL NOT BE PERMITTED IN
THE DAM OR POOL AREA OF THE POND. WHEN
BLASTING IS USED TO REMOVE ROCK FROM THE
POOL AREA, THE BLASTED AREA SHALL BE
OVER -EXCAVATED TO A DEPTH OF AT LEAST
TWO FEET (2) BELOW FINISH GRADE AND
BROUGHT BACK TO FINISH GRADE WITH CLEAN
RELATIVELY IMPERVIOUS SOIL MATERIAL
COMPACTED IN PLACE.
EARTH FILL DAMS
1. SOIL MATERIALS USED FOR EARTH FILL WHICH
ARE HIGHLY PERMEABLE OR WHICH EXHIBIT
SIGNIFICANT.
2. EMBANKMENTS FILL MATERIAL TO BE
COMPACTED TO AT LEAST 95% STANDARD
PROCTOR COMPACTION.
3. SHRINKAGE SWELL, OR DISPERSION SHALL NOT
BE USED IN THE EMBANKMENT.
4. A CUTOFF TRENCH (CORE TRENCH) SHALL BE
PROVIDED WITH A MINIMUM WIDTH OF FIVE FEET
(5'). THE CENTERLINE OF THE CUTOFF TRENCH
SHALL NOT BE LOCATED DOWNSTREAM OF THE
INSIDE TOP OF SLOPE OF THE DAM. THE
CUTOFF TRENCH SHALL BE CAREFULLY
BACK -FILLED WITH HIGHLY IMPERMEABLE
MATERIAL AND COMPACTED TO AT LEAST
NINETY-FIVE PERCENT (95%) OF STANDARD
PROCTOR DENSITY.
5. THE MINIMUM TOP WIDTH OF THE DAM SHALL
BE TEN FEET (10') AND SLOPES SHALL NOT BE
STEEPER THAN 2:1 (TWO HORIZONTAL TO ONE
VERTICAL) ON THE DAM OR EMBANKMENTS
AROUND THE POND.
6. ALL DISTURBED GROUND AREAS AND
EMBANKMENTS SURROUNDING THE POND SHALL
BE MECHANICALLY STABILIZED AND HAVE
PERMANENT GROUND COVER ESTABLISHED IN
ACCORDANCE WITH THE PERMANENT SEEDING
SCHEDULE.
MINIMUM MAINTENANCE SCHEDULE
1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING
RAINFALL EVENT AND AT LEAST MONTHLY:
1.1 INSPECT THE DETENTION BASIN SYSTEM
FOR SEDIMENT ACCUMULATION EROSION
TRASH ACCUMULATION, VEGETATED COVER, AND
GENERAL CONDITION.
1.2 CHECK AND CLEAR THE ORIFICE OF ANY
OBSTRUCTIONS THAT WOULD INTERFERE WITH
THE DRAW DOWN
OF THE TEMPORARY POOL AS DESIGNED.
2. REPAIR ERODED AREAS IMMEDIATELY. RE -SEED
THE EMBANKMENT AS NECESSARY TO MAINTAIN
GOOD VEGETATIVE COVER. MOW VEGETATIVE
COVER ON EMBANKMENT TO MAINTAIN A
MAXIMUM HEIGHT OF SIX INCHES, REMOVE
TRASH AS NEEDED.
3. INSPECT AND REPAIR THE COLLECTION SYSTEM
(I.E. CATCH BASINS, PIPING, SWALES, RIP RAP,
ETC.) QUARTERLY TO MAINTAIN PROPER
FUNCTIONING.
4. REMOVE WOODY VEGETATION NOT PART OF THE
APPROVED PLAN ALONG THE DAM EMBANKMENT.
5. REMOVE ACCUMULATED SEDIMENT FROM THE
WET DETENTION BASIN SYSTEM SEMI-ANNUALLY
OR WHEN THE DEPTH IS REDUCED TO 75% OF
THE ORIGINAL DESIGN DEPTH. REMOVED
SEDIMENT SHALL BE DISPOSED OF IN AN
APPROPRIATE MANNER AND SHALL BE HANDLED
IN A MANNER THAT WILL NOT ADVERSELY
IMPACT WATER QUALITY (I.E. STOCKPILING NEAR
A WET DETENTION BASIN OR STREAM, ETC.).
6. PERFORM ANNUAL INSPECTION OF THE BASIN
(ANNUAL INSPECTION REPORTS TO BE KEPT BY
THE OWNER). PRIOR TO INSPECTION
NOTIFICATION MUST BE GIVEN TO STORM WATER
SERVICES.
CONSTRUCTION
1. CONSTRUCTION METHODS, SAMPLING AND TESTING
WILL BE RECOMMENDED BY THE GEOTECHNICAL.
TYPICAL TESTS TO BE INCLUDED ARE MOISTURE
CONTENT, IN -PLACE DENSITY, ATTERBERG LIMITS
AND PERMEABILITY TESTING..
2. PRIOR TO SOIL LINER PLACEMENT, THE PREPARED
SUBGRADE SHALL BE PROOFROLLED WITH A
LOADED DUMP TRUCK (MIN. 20 TONS) OR SIMILAR
RUBBER TIRED PNEUMATIC VEHICLE, A MINIMUM OF
TWO PASSES IN EACH DIRECTION.
3. LOOSE SOIL LINER FILL LIFT THICKNESS, PRIOR TO
COMPACTION, SHALL BE A MAXIMUM OF 6 INCHES.
THINNER LIFTS ARE PERMISSIBLE TO ACHIEVE
DESIGN GRADE AND/OR SOIL LINER PROPERTY
SPECIFICATIONS.
4. EQUIPMENT OR TRUCK TRAFFIC SHALL NOT BE
PERMITTED DURING THE PERIOD BETWEEN
SCARIFYING AND COMPACTION OF A LIFT UNLESS
APPROVED BY THE ENGINEER.
5. SOIL LINER FILL SHALL NOT BE PLACED OR
COMPACTED DURING SUSTAINED PERIODS OF AIR
TEMPERATURES BELOW 32 DEGREES F. IF THE
SOIL LINER FILL FREEZES OR ICES THE FILL
SECTION SHALL BE RE -SCARIFIED AND
RE -COMPACTED.
6. THE COMPACTED SOIL LINER SHALL BE
CONSTRUCTED TO THE MINIMUM THICKNESS
SPECIFIED BY THE PROJECT PLANS.
7. AFTER COMPLETION OF A SEGMENT OF COMPACTED
SOIL LINER, BUT BEFORE INSTALLATION OF THE
TOPSOIL PROTECTIVE LAYER, THE SURFACE OF THE
SOIL LINER SHALL BE SURVEYED BY THE
CONTRACTOR TO ENSURE THE SPECIFIED
THICKNESS OF COMPACTED SOIL LINER.
PLANT SCHEDULE
ORNAMFNTAI GRASSFS ANn GR0t1NnrovFRB
ASIN
58
30
ONTY
ABBRV
TOP
LOP
SCIENTIFIC NAME
COMMON NAME
PLANTING SIZE
SPACING
MISCELLANEOUS / REMARKS
1161
ASIN
0
0
Asclepius incarnato
Swamp Milkweed
CONT 4" POTS
2'
Full and well formed
1414
HIBC
0
0
Hibiscus coccineus
Scarlett Rose Mallow
CONT 4" POTS
2'
Full and well formed
1479
LOCA
0
0
Lobelia cardinalis
Cardinal Flower
CONT 4" POTS
2'
Full and well formed
NOTE:
PLANT QUANTITIES ARE TOTAL FOR ALL FOUR PONDS.
�S
PROVIDE 4
WATERTIGHT S
CONNECTION
12" THICK (MIN.)
CAST -IN -PLACE OR PRECAST
CONCRETE COLLAR
(MIN. 2000 PSI)
ANTI -SEEP
COLLAR
SPECIFICATIONS
PIPE
RISER TO
ID
DIA
S
NO OF
FIRST
(IN)
(IN)
COLLARS
COLLAR
(FT)
WET POND
54
78
1
25
02
NOTES:
1. ALL COLLARS SHALL BE INSTALLED TO BE
WATER -TIGHT.
2. COLLAR DIMENSIONS TO EXTEND 18" (MIN) BEYOND
SPECIFIED PIPE DIAMETER ON ALL SIDES.
3. FIRST ANTI -SEEP COLLAR TO BE LOCATED SLIGHTLY
DOWNSTREAM OF DAM CENTER LINE.
ANTI -SEEP COLLAR
BMP DATA TABLE
POND
SPILLWAY
POND ELEVATIONS
ID
BOTTOM
TOP
DEPTH
LENGTH(FT)
ELEV
PERM POOL
10-YR ELEV
25-YR ELEV
50-YR ELEV
WET POND 02
7555
7700
14 5
60
7687
7640
7679
L2"x2"xl/4" GALV
STEEL ANGLE (TYP)
WELDED FRAME FOR
BAR GRATE PANELS
F.
FRAME BOLTED TO
TOP OF CONCRETE
STORM BOX WITH
60'1 INSIDE
AND
72"1 OUTSIDE
DIMENSIONS
N
r
72"
POND
(CONTRACTOR SHALL SUBMIT SHOP DRAWINGS
FOR APPROVAL BY THE ENGINEER)
TOP OF RISER = 768.85
3.00' WIDE 3.25' TALL
WEIR = 765.60
5" (I.D.) ORIFICE = 764.00
WATER QUALITY ORIFICE ,An TO EXTEND 12" BELOW,-'
" PERMANENT POOL ELEV.
6" DIP ® 0.50% MIN. SLOPE.
GRAVITY DRAIN WITH SLUICE
GATE OR VALVE SYSTEM.
I IE = 761.60'
MI& I
INV : 764 00
LOCA
75
0
GRAPHIC SCALE
15 30 60 Q�
( IN FEET )
1 inch = 30 ft.
EXPANDED METAL GRATE
EXPANDED METAL GRATE
TRASH RACK FOR RISER
(SEE DETAILS)
OUTLET PIPE
I I
A I A
ORIFICE OF NING
TRASH RACK FOR RISER
(SEE DETAILS)
5' WEIR OPENING
�-
5'
3.00' WIDE 3.25' TALL
WEIR = 765.60
SD OUTLET PIPE
5" PVC PIPE WITH INSIDE
INVERT SET AT ELEV. 764.50
AND GROUTED INTO
OVERSIZED HOLE.
IE = 761.6
IE = 761.5
OVERSIZED CORED OR PREFAB HOLE
OUTLET PIPE INV.: 761.50 �� \
SLO
GRAVITY DRA NO WI HINS UICEE.
GATE OR VALVE SYSTEM.
IE = 761.60'
12'
12'
NOT TO SCALE
SECTION A -A
GENERAL NOTES:
1. OUTFALL STRUCTURE SHALL HAVE 6" THICK WALLS AND 10" THICK BOTTOM. NOTE
2. INSIDE DIMENSIONS OF OUTFALL STRUCTURE SHALL BE 5'x5'. NCDEQ WILL REQUIRE AN OPERATION AND
3. ENDS OF ALL PIPES SHALL BE FLUSH WITH INSIDE WALL OF STRUCTURE. MAINTENANCE PLAN AND INSPECTION AND
4. PIPE OPENING TO BE WATERTIGHT MAINTENANCE AGREEMENT
SAFETY FENCE CONTROL STRUCTURE
(ALONG PERIMETER)
NOT TO SCALE
PON � SECTIONAL VIEW
768 5 768 8 STORM
WATER fI_ BASIN LENGTH (SEE PLAN)
RUNOFF
� I
100-YR WATER SURFACE ELEVATION = 769 0 TRASH RACK
_ / /U.0
I WAY =
_ _ _ _ _ _ _ _ _ _ _
_ _ _ _ 50-YR WATER SURFACE ELEVATION = 768.8 _ _ _ _ _ _
_ _ _ _ _ _
25-YR WATER SURFACE ELEVATION = 768.5
L2%2%I/4" GALVANIZED ANGLE
- - - - - - - - - -
- - - - - - - - - - _ _ _ _ - -
10-YYR WATER SURFACE ELEVATION = 767.9
- - - - - - -
OVERLAPPED AND BOLTED TO
_ _ _ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
2-YR WATER SURFACE ELEVATION = 766.7
_ _ _ _ _ _
RISER CREST=768.85 EARTHEN DAM
RESTRAIN BAR GRATE AND AND
- - - - - - - - -
- - - - - - - - - - - - - - - -
- - - - - -
STILL ALLOW REMOVAL
_ _ _ _ _ _ _ _
_
" THICK
6 (TYP) �,
BAR GRATE I/4" x I" GALVANIZED HEXHEAD
VEGETATivE SHELF
NORMAL WATER = 764.0
CONTROL oEr `3L
BOLT, WASHERS, & NUT
- - - - - -
- - 6:1 SLOPE
s
STRUCTURE
TACK -WELD NUT TO BACK SIDE
TATIVE SHELF (SEE
RIP -RAP APRON
B 5' PERMANENT
VEGE
g;1 SLOPE DETNL)
(SEE DETAIL)
INTERCONNECTED RCP PIPES
SEE PLANS FOR SIZE AND LOCATIONS
CL-II RIPRAP
POOL DEPTH
STORAGE ELEV = 756.0
- - - - - - - -
- -
STABIILIZATION
BASIN BOTTOM = 755.5
TOP OF VEGETATIVE SHELF
-
- -
_
ELEV: 764.50
BOTTOM OF
Tr 61" x 61" LOWER WELDED VEGETATIVE SHELF
FRAME L2°x2°xl/4" ELEV: 763.50 12" CLAY LINER SHALL BE CONSTRUCTED RISER ANTI -FLOATATION CLASS V RCP
OTY=1 GALVANIZED ANGLE
5/16" HOLES 72" x 72"
FOR CONC ANCHOR I"x3" GALV STEEL OR 1/4'1 GALV STEEL
BOLTS (TYP) ALUMINUM BAR GRATE CONCRETE EXPANSION BOLT
FRAME & BAR GRATE CONSTRUCTION BAR GRATE INSTALLATION
N T S N T S
EXPANDED METAL GRATE TRASH RACK FOR RISER
OR COMPACTED SUCH THAT INFILTRATION
RATE IS NOT MORE THAN 0.01 IN/HR
WET DETENTION POND 2
NOT TO SCALE
OUTLET PIPE WITH
DUCTILE IRON MAINTENANCE WATERTIGHT JOINTS
DRAIN PIPE WITH SLUICE
GATE OR VALVE AT RISER
(0.50% SLOPE, MIN.) NOTE: SEE GRADING PLAN SHEET C3 0
SHWT WAS NOT ENCOUNTERED IN THIS AREA. FOR PIPE INVERTS, PIPE SIZE, AND PIPELENGTHS
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JOB NO:
J- 29101 0000
DATE:
1-II-22
DRAWN:
NH
DESIGNED:
NH
REVIEWED:
WBS
APPROVED:
WBS
SCALE:
I" = 30'
C3*10
NOT TO SCALE

3
zI
♦ A" i
/o r
o � /
o �� �t�
a
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ASIN
87
/ INV : 76400
104
HIBC
57 POND 3
TOP: 770.0 NOTE:
SEE SHEET L2.1, L2.2 AND
NWL: 7 J �56 L2.3 FOR PLANTING DETAILS,
BOP: 755..5 ASIN IJNOTS AND SPECIFICATIONS
w _ �5 58 / - I�
/INV :764 00 j�
a 0.0
I o 0% / 626` �65 �66
RCP
��EMERGENCY SPILLWAT
p o 0.00% 0 1
o 46TE: /
ASIN HIB1 /,,ALL POND EMBANKMENTS SHALL ( /
_ _ -13E SEEDED WITH PERMANENT
;d 80 / _ _ _ - - - - - _ - - 58 �66 / / rGEEDING (BERMUDA GRASS) f�
00
LOCA / PER EROSION CONTROL /
/ ♦ n 58 �65 -IC - J PLANS AND GRASSING SPECIFICATIONS/
1000
/ / / --7-/--
00,
\j / �� ,-✓
n i_j q ♦1
1 ( J ! IE: 760 42 �� J
GRAPHIC SCALE
30 0 15 30 60 120
( IN FEET )
1 inch = 30 ft.
PLANT SCHEDULE
ORNAMENTAL GRASSES AND GROUNDCOVERS
QNTY
ABBRV
TQP
LQP
SCIENTIFIC NAME
COMMON NAME
PLANTING SIZE
SPACING
MISCELLANEOUS / REMARKS
1161
ASIN
0
0
Asclepius incarnata
Swamp Milkweed
CONT 4" POTS
2'
Full and well formed
1414
HIBC
0
0
Hibiscus coccineus
Scarlett Rose Mallow
CONT 4" POTS
2'
Full and well formed
1479
LOCA
0
0
Lobelia cardinalis
Cardinal Flower
CONT 4" POTS
2'
Full and well formed
NOTE:
PLANT QUANTITIES ARE TOTAL FOR ALL FOUR PONDS.
�s
v p v
PROVIDE 4
WATERTIGHT S
CONNECTION
12- THICK (MIN.) 4
CAST -IN -PLACE OR PRECAST
CONCRETE COLLAR
(MIN. 2000 PSI)
ANTI -SEEP
COLLAR
SPECIFICATIONS
PIPE
RISER TO
ID
DIA
S
NO OF
FIRST
(IN)
(IN)
COLLARS
COLLAR
(FT)
WET POND
54
78
1
25
03
NOTES:
1. ALL COLLARS SHALL BE INSTALLED TO BE
WATER -TIGHT.
2. COLLAR DIMENSIONS TO EXTEND 18- (MIN) BEYOND
SPECIFIED PIPE DIAMETER ON ALL SIDES.
3. FIRST ANTI -SEEP COLLAR TO BE LOCATED SLIGHTLY
DOWNSTREAM OF DAM CENTER LINE.
ANTI -SEEP COLLAR
SAFETY FENCE
(ALONG PERIMETER)
COMPACTED SOIL (CLAY) LINER
SPECIFICATIONS
THE BMP POND SHALL INCLUDE A COMPACTED
SOIL LINER. THE EARTHWORK CONTRACTOR SHALL
FURNISH ALL LABOR, MATERIAL, SUPERVISION, AND
EQUIPMENT TO COMPLETE THE COMPACTED SOIL
LINER FOR THE POND INCLUDING THE FOLLOWING
OPERATIONS: HAULING, SIEVING, RAKING, DISCING,
COMPACTING, DRYING, WETTING, REMOVAL OF
RAINWATER, REMOVAL OF ALL PREVIOUSLY PLACED
MATERIAL RENDERED UNSUITABLE DUE TO
WEATHER CONDITIONS OR CONSTRUCTION
OPERATIONS, FINAL GRADING AND SEALING, AND
ALL NECESSARY AND INCIDENTAL ITEMS AS
DETAILED OR REQUIRED TO COMPLETE THE
COMPACTED LINER.
SOIL LINER FILL MATERIALS ARE POTENTIALLY
ON -SITE. ON -SITE SOILS THAT MEET THE
FOLLOWING REQUIREMENTS SHALL BE CLASSIFIED
AS SOIL LINER FILL MATERIAL AND MAY BE USED
IN THE CONSTRUCTION OF THE COMPACTED SOIL
LINER:
1. LIQUID LIMIT, PLASTICITY INDEX, AND PERCENT
PASSING THE NO. 200 SIEVE WILL BE
CONSIDERED FOR PROPER CLASSIFICATION. THE
SOIL LINER MATERIAL SHALL HAVE A PLASTICITY
INDEX GREATER THAN 20 OR AS SUBSEQUENTLY
SPECIFIED BASED ON LABORATORY TESTING, AND
HAVE A SOIL PERMEABILITY OF 1 E-5 CM/SEC
OR SLOWER AS DETERMINED BY SOIL
PERMEABILITY (ASTM D5084).
2. SOIL LINER FILL MATERIALS SHALL BE
REASONABLY FREE OF GYPSUM, FERROUS,
AND/OR CALCAREOUS CONCRETIONS AND
NODULES OR OTHER DELETERIOUS SUBSTANCES.
SOIL LINER MATERIAL SHALL BE RAKED OR
SIEVED BY THE EARTHWORK CONTRACTOR, IF
NECESSARY, TO REMOVE ALL AGGREGATE
GREATER THAN 1 INCH IN DIAMETER. NO MORE
THAN 5 PERCENT OF THE SOIL LINER FILL
MATERIAL SHOULD BE RETAINED IN THE NO. 4
SIEVE.
3. PRIOR TO COMPACTION, ALL CLAY CLODS WILL
BE BROKEN DOWN WITH TILLERS AND/OR DISCS
TO PROVIDE A HOMOGENEOUS CLAY SOIL THAT
IS FREE OF CLAY CLODS LARGER THAN 2
INCHES IN DIAMETER.
CONSTRUCTION
1. CONSTRUCTION METHODS, SAMPLING AND
TESTING WILL BE RECOMMENDED BY THE
GEOTECHNICAL. TYPICAL TESTS TO BE INCLUDED
ARE MOISTURE CONTENT, IN -PLACE DENSITY,
ATTERBERG LIMITS AND PERMEABILITY TESTING..
2. PRIOR TO SOIL LINER PLACEMENT, THE
PREPARED SUBGRADE SHALL BE PROOFROLLED
WITH A LOADED DUMP TRUCK (MIN. 20 TONS)
OR SIMILAR RUBBER TIRED PNEUMATIC VEHICLE,
A MINIMUM OF TWO PASSES IN EACH DIRECTION.
3. LOOSE SOIL LINER FILL LIFT THICKNESS, PRIOR
TO COMPACTION, SHALL BE A MAXIMUM OF 6
INCHES. THINNER LIFTS ARE PERMISSIBLE TO
ACHIEVE DESIGN GRADE AND/OR SOIL LINER
PROPERTY SPECIFICATIONS.
4. EQUIPMENT OR TRUCK TRAFFIC SHALL NOT BE
PERMITTED DURING THE PERIOD BETWEEN
SCARIFYING AND COMPACTION OF A LIFT UNLESS
APPROVED BY THE ENGINEER.
5. SOIL LINER FILL SHALL NOT BE PLACED OR
COMPACTED DURING SUSTAINED PERIODS OF AIR
TEMPERATURES BELOW 32 DEGREES F. IF THE
SOIL LINER FILL FREEZES OR ICES THE FILL
SECTION SHALL BE RE -SCARIFIED AND
RE -COMPACTED.
6. THE COMPACTED SOIL LINER SHALL BE
CONSTRUCTED TO THE MINIMUM THICKNESS
SPECIFIED BY THE PROJECT PLANS.
7. AFTER COMPLETION OF A SEGMENT OF
COMPACTED SOIL LINER, BUT BEFORE
INSTALLATION OF THE TOPSOIL PROTECTIVE
LAYER, THE SURFACE OF THE SOIL LINER SHALL
BE SURVEYED BY THE CONTRACTOR TO ENSURE
THE SPECIFIED THICKNESS OF COMPACTED SOIL
LINER.
MINIMUM MAINTENANCE SCHEDULE
1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING
RAINFALL EVENT AND AT LEAST MONTHLY:
1.1 INSPECT THE DETENTION BASIN SYSTEM
FOR SEDIMENT ACCUMULATION, EROSION, TRASH
ACCUMULATION, VEGETATED COVER, AND
GENERAL CONDITION.
1.2 CHECK AND CLEAR THE ORIFICE OF ANY
OBSTRUCTIONS THAT WOULD INTERFERE WITH
THE DRAW DOWN
OF THE TEMPORARY POOL AS DESIGNED.
2. REPAIR ERODED AREAS IMMEDIATELY. RE -SEED
THE EMBANKMENT AS NECESSARY TO MAINTAIN
GOOD VEGETATIVE COVER. MOW VEGETATIVE
COVER ON EMBANKMENT TO MAINTAIN A
MAXIMUM HEIGHT OF SIX INCHES, REMOVE
TRASH AS NEEDED.
3. INSPECT AND REPAIR THE COLLECTION SYSTEM
(I.E. CATCH BASINS, PIPING, SWALES, RIP RAP,
ETC.) QUARTERLY TO MAINTAIN PROPER
FUNCTIONING.
4. REMOVE WOODY VEGETATION NOT PART OF THE
APPROVED PLAN ALONG THE DAM EMBANKMENT.
5. REMOVE ACCUMULATED SEDIMENT FROM THE WET
DETENTION BASIN SYSTEM SEMI-ANNUALLY OR
WHEN THE DEPTH IS REDUCED TO 75% OF THE
ORIGINAL DESIGN DEPTH. REMOVED SEDIMENT
SHALL BE DISPOSED OF IN AN APPROPRIATE
MANNER AND SHALL BE HANDLED IN A MANNER
THAT WILL NOT ADVERSELY IMPACT WATER
QUALITY (I.E. STOCKPILING NEAR A WET
DETENTION BASIN OR STREAM, ETC.).
6. PERFORM ANNUAL INSPECTION OF THE BASIN
(ANNUAL INSPECTION REPORTS TO BE KEPT BY
THE OWNER). PRIOR TO INSPECTION NOTIFICATION
MUST BE GIVEN TO STORM WATER SERVICES.
NOTE
THE PRECAST MANUFACTURER IS TO PREPARE AND
SUBMIT TO THE ENGINEER DESIGN DETAILS AND
CALCULATIONS FOR THE STRUCTURES SHOWN
BASED ON THE DESIGN CRITERIA SPECIFIED. THE
DESIGN SHALL BE PERFORMED UNDER THE DIRECT
SUPERVISION AND SEALED BY A PROFESSIONAL
ENGINEER REFEREED IN THE STATE OF NORTH
CAROLINA EXPERIENCED IN THE DESIGN OF
PRECAST CONCRETE. THE DESIGN SHALL INCLUDE
PROVISION S FOR HANDLING STRESSES AND
CONSTRUCTION LOADS. REPRODUCED COPIES OF
ASTM C789 "STANDARD SPECIFICATIONS FOR
PRECAST REINFORCED CONCRETE BOX SECTIONS
FOR CULVERTS, STORM DRAINS, AND SEWERS" WILL
NOT BE ACCEPTED AS A SUBSTITUTED FOR DESIGN.
NOTE
NCDEQ WILL REQUIRE AN OPERATION AND
MAINTENANCE PLAN AND INSPECTION AND
MAINTENANCE AGREEMENT
0
EMBANKMENT CONSTRUCTION NOTES
GENERAL
1. THE POND AND DAM AREA SHALL BE CLEARED,
GRUBBED AND STRIPPED OF ALL VEGETATIVE
MATERIAL AND TOPSOIL PRIOR TO DAM
CONSTRUCTION, THE DISPOSAL OF TREES,
STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE
MATERIAL, ETC. SHALL NOT BE PERMITTED IN
THE DAM OR POOL AREA OF THE POND. WHEN
BLASTING IS USED TO REMOVE ROCK FROM THE
POOL AREA, THE BLASTED AREA SHALL BE
OVER -EXCAVATED TO A DEPTH OF AT LEAST
TWO FEET (2) BELOW FINISH GRADE AND
BROUGHT BACK TO FINISH GRADE WITH CLEAN
RELATIVELY IMPERVIOUS SOIL MATERIAL
COMPACTED IN PLACE.
EARTH FILL DAMS
1. SOIL MATERIALS USED FOR EARTH FILL WHICH
ARE HIGHLY PERMEABLE OR WHICH EXHIBIT
SIGNIFICANT.
2. EMBANKMENTS FILL MATERIAL TO BE COMPACTED
TO AT LEAST 95% STANDARD PROCTOR
COMPACTION.
3. SHRINKAGE SWELL, OR DISPERSION SHALL NOT
BE USED IN THE EMBANKMENT.
4.A CUTOFF TRENCH (CORE TRENCH) SHALL BE
PROVIDED WITH A MINIMUM WIDTH OF FIVE FEET
(5'). THE CENTERLINE OF THE CUTOFF TRENCH
SHALL NOT BE LOCATED DOWNSTREAM OF THE
INSIDE TOP OF SLOPE OF THE DAM. THE
CUTOFF TRENCH SHALL BE CAREFULLY
BACK -FILLED WITH HIGHLY IMPERMEABLE
MATERIAL AND COMPACTED TO AT LEAST
NINETY-FIVE PERCENT (95%) OF STANDARD
PROCTOR DENSITY.
5. THE MINIMUM TOP WIDTH OF THE DAM SHALL BE
TEN FEET (10') AND SLOPES SHALL NOT BE
STEEPER THAN 2:1 (TWO HORIZONTAL TO ONE
VERTICAL) ON THE DAM OR EMBANKMENTS
AROUND THE POND.
6. ALL DISTURBED GROUND AREAS AND
EMBANKMENTS SURROUNDING THE POND SHALL
BE MECHANICALLY STABILIZED AND HAVE
PERMANENT GROUND COVER ESTABLISHED IN
ACCORDANCE WITH THE PERMANENT SEEDING
SCHEDULE.
BMP DATA TABLE
POND
SPILLWAY
POND ELEVATIONS
ID
BOTTOM
TOP
DEPTH
LENGTH(FT)
ELEV
PERM POOL
10-YR ELEV
25-YR ELEV
50-YR ELEV
WET POND 03
755 5
7700
14 5
70
768 7
764 0
768 0
768 6
7689
POND SECTIONAL VIEW
STORMWATER I_
f BASIN LENGTH
RUNOFF� I
I UF' Ur tM0ANKMtNI = //U.0
_100=YR WATER SURFACE ELEVATION =769.0 - - - -
_ - - _ _ _ _ - - - - - - -
- - - _ EMERGENCY SPILLWAY = 768.7
SEE POND 2
50-YR WATER SURFACE ELEVATION = 768.9
FOR DETAILS
_ _
_
25-YR WATER SURFACE ELEVATION = 761-
- - - - - -
- - - - - - - -
- - - - -
10-YR WATER SURFACE ELEVATION = 768.0 - - - -
- - - - _ - - - - - - - - -
- - - - - - - - - - - - -
2-YR WATER SURFACE ELEVATION = 766.7 - -
EARTHEN DAM
- - - - - - -
r- 6' (TYP)
- - - - - -
VEGETATIVE SHELF
- - s:1 SLOPE
NORMAL WATER = 764.0
um -SEEP couui
SEE "FAIL
tSEE
ELF _
POND 4
SEDIMENT
B 5' PERMANENT
VEGE6, SILOPE
FOR DETAILS
54" CLASS IV RCP INTER
FOREBAY
POOL DEPTH
STORAGE ELEV = 756.0
CONNECTED PIPE WITH
II RI
1
WATERTIGHT JOINTS
TI N
STABTABIILIZATIO
BASIN BOTTOM = 755.5
________________
_______-
TOP OF VEGETATIVE SHELF
ELEV: 764.50
BOTTOM OF
FOREBAY EXIT
VEGETATIVE SHELF
ELEV: 756.0
12" CLAY LINER SHALL BE CONSTRUCTED
36" CLASS IV RCP
ELEV: 763.50
OR COMPACTED SUCH THAT INFILTRATION
INTER CONNECTED
FOREBAY ENTRANCE
RATE IS NOT MORE THAN 0.01 IN/HR
ELEV: 755.5
PIPE X 2 WITH
WATERTIGHT JOINTS
WET DETENTION POND 3
NOTE: SEE GRADING PLAN SHEET C3 0
FOR PIPE INVERTS, PIPE SIZE, AND PIPE
SHWT WAS NOT ENCOUNTERED IN THIS AREA.
LENGTHS
NOT TO SCALE
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DATE: 1-II-22
DRAWN:
NH
DESIGNED:
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REVIEWED:
WBS
APPROVED:
WBS
SCALE:
I" = 30
C3ell..j
NOT TO SCALE

INV : 760 57
LOCA
135
59
ASIN
• • .
HIBc
60
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ASIN
5 LOCH
do
HIBC
8
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LOCq INV : 764
74 /
CP` p�016
130 LF 36 R -
Rr = p p096
129 LF 36
ASIN
F_
LOCH �80 / 59� 58 58 ASIN IN V 76 HIBC LOCH : 764 00 769 /
59 58 70 59 ASIN LOCA
OHP - 58 58 HIBC /
770 - 68
`�► OHP _ 769 58 /
HP 769 767 -- NOTE: EMERGENCY SPILLWAY
�►
OHP 766+sS�AELSEOND EMBA NTS SHALL
~ _ NKME I�
\ - - ^ ` - \ .►\ �HP� _ SEEDING Eg WITH PERMANENTALL 767
HP - PER EROSION GRASS)
PLANS AND GRASSINCONTROL \
- ` SPECIFICATIONS--- _
� - - Zia �
SEE: HP
\ SHEET L2.1, -
�`� r L2.3 FOR P AND -
_ NOTES AND LANTING DETAILS,
C SPECIFICATIONS
\_:7�
_L -- v _- ---- J IF
TL
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V GRAVEL
FACING
POND 4
•- • •
•
BOP: 758.5
ASIN HIB 7ss
GRAPHIC SCALE
0 15 30 60
( IN FEET )
1 inch = 30 ft.
PLAN VIEW
120
2' MN.
-04
CROSS-SECTION
FOREBAY DAM
PLANT SCHEDULE
ORNAMFNTAI r;RASSFS ANn r;Rot1NnrovFRS
QNTY
ABBRV
TQP
LQP
SCIENTIFIC NAME
COMMON NAME
PLANTING SIZE
SPACING
MISCELLANEOUS / REMARKS
1161
ASIN
0
0
Asclepius incornota
Swamp Milkweed
CONT 4" POTS
2'
Full and well formed
1414
HIBC
0
0
Hibiscus coccineus
Scorlett Rose Mallow
CONT 4" POTS
2'
Full and well formed
1479
LOCA
0
0
Lobelia cardinalis
Cardinal Flower
CONT 4" POTS
2'
Full and well formed
NOTE:
PLANT QUANTITIES ARE TOTAL FOR ALL FOUR PONDS.
0
PROVIDE
WATERTIGHT
CONNECTION
12" THICK (MIN.)
CAST -IN -PLACE OR PRECAST
CONCRETE COLLAR
(MIN. 2000 PSI)
ANTI -SEEP
COLLAR
SPECIFICATIONS
PIPE
RISER TO
ID
DIA
S
NO OF
FIRST
(IN)
(IN)
COLLARS
COLLAR
(FT)
WET POND
36
78
I
25
04
NOTES:
1. ALL COLLARS SHALL BE INSTALLED TO BE
WATER -TIGHT.
2. COLLAR DIMENSIONS TO EXTEND 18" (MIN) BEYOND
SPECIFIED PIPE DIAMETER ON ALL SIDES.
3. FIRST ANTI -SEEP COLLAR TO BE LOCATED SLIGHTLY
DOWNSTREAM OF DAM CENTER LINE.
ANTI -SEEP COLLAR
COMPACTED SOIL (CLAY) LINER
SPECIFICATIONS
THE BMP POND SHALL INCLUDE A COMPACTED
SOIL LINER. THE EARTHWORK CONTRACTOR SHALL
FURNISH ALL LABOR, MATERIAL, SUPERVISION, AND
EQUIPMENT TO COMPLETE THE COMPACTED SOIL
LINER FOR THE POND INCLUDING THE FOLLOWING
OPERATIONS: HAULING, SIEVING, RAKING, DISCING,
COMPACTING, DRYING, WETTING, REMOVAL OF
RAINWATER, REMOVAL OF ALL PREVIOUSLY PLACED
MATERIAL RENDERED UNSUITABLE DUE TO
WEATHER CONDITIONS OR CONSTRUCTION
OPERATIONS, FINAL GRADING AND SEALING, AND
ALL NECESSARY AND INCIDENTAL ITEMS AS
DETAILED OR REQUIRED TO COMPLETE THE
COMPACTED LINER.
SOIL LINER FILL MATERIALS ARE POTENTIALLY
ON -SITE. ON -SITE SOILS THAT MEET THE
FOLLOWING REQUIREMENTS SHALL BE CLASSIFIED
AS SOIL LINER FILL MATERIAL AND MAY BE USED
IN THE CONSTRUCTION OF THE COMPACTED SOIL
LI N ER:
1. LIQUID LIMIT, PLASTICITY INDEX, AND PERCENT
PASSING THE NO. 200 SIEVE WILL BE
CONSIDERED FOR PROPER CLASSIFICATION. THE
SOIL LINER MATERIAL SHALL HAVE A PLASTICITY
INDEX GREATER THAN 20 OR AS SUBSEQUENTLY
SPECIFIED BASED ON LABORATORY TESTING, AND
HAVE A SOIL PERMEABILITY OF 1 E-5 CM/SEC
OR SLOWER AS DETERMINED BY SOIL
PERMEABILITY (ASTM D5084).
2. SOIL LINER FILL MATERIALS SHALL BE
REASONABLY FREE OF GYPSUM, FERROUS,
AND/OR CALCAREOUS CONCRETIONS AND
NODULES OR OTHER DELETERIOUS SUBSTANCES.
SOIL LINER MATERIAL SHALL BE RAKED OR
SIEVED BY THE EARTHWORK CONTRACTOR, IF
NECESSARY, TO REMOVE ALL AGGREGATE
GREATER THAN 1 INCH IN DIAMETER. NO MORE
THAN 5 PERCENT OF THE SOIL LINER FILL
MATERIAL SHOULD BE RETAINED IN THE NO. 4
SIEVE.
3. PRIOR TO COMPACTION, ALL CLAY CLODS WILL
BE BROKEN DOWN WITH TILLERS AND/OR DISCS
TO PROVIDE A HOMOGENEOUS CLAY SOIL THAT
IS FREE OF CLAY CLODS LARGER THAN 2
INCHES IN DIAMETER.
CONSTRUCTION
1. CONSTRUCTION METHODS, SAMPLING AND
TESTING WILL BE RECOMMENDED BY THE
GEOTECHNICAL. TYPICAL TESTS TO BE INCLUDED
ARE MOISTURE CONTENT, IN -PLACE DENSITY,
ATTERBERG LIMITS AND PERMEABILITY TESTING..
2. PRIOR TO SOIL LINER PLACEMENT, THE
PREPARED SUBGRADE SHALL BE PROOFROLLED
WITH A LOADED DUMP TRUCK (MIN. 20 TONS)
OR SIMILAR RUBBER TIRED PNEUMATIC VEHICLE,
A MINIMUM OF TWO PASSES IN EACH DIRECTION.
3. LOOSE SOIL LINER FILL LIFT THICKNESS, PRIOR
TO COMPACTION, SHALL BE A MAXIMUM OF 6
INCHES. THINNER LIFTS ARE PERMISSIBLE TO
ACHIEVE DESIGN GRADE AND/OR SOIL LINER
PROPERTY SPECIFICATIONS.
4. EQUIPMENT OR TRUCK TRAFFIC SHALL NOT BE
PERMITTED DURING THE PERIOD BETWEEN
SCARIFYING AND COMPACTION OF A LIFT UNLESS
APPROVED BY THE ENGINEER.
5. SOIL LINER FILL SHALL NOT BE PLACED OR
COMPACTED DURING SUSTAINED PERIODS OF AIR
TEMPERATURES BELOW 32 DEGREES F. IF THE
SOIL LINER FILL FREEZES OR ICES THE FILL
SECTION SHALL BE RE -SCARIFIED AND
RE -COMPACTED.
6. THE COMPACTED SOIL LINER SHALL BE
CONSTRUCTED TO THE MINIMUM THICKNESS
SPECIFIED BY THE PROJECT PLANS.
7. AFTER COMPLETION OF A SEGMENT OF
COMPACTED SOIL LINER, BUT BEFORE
INSTALLATION OF THE TOPSOIL PROTECTIVE
LAYER, THE SURFACE OF THE SOIL LINER SHALL
BE SURVEYED BY THE CONTRACTOR TO ENSURE
THE SPECIFIED THICKNESS OF COMPACTED SOIL
LINER.
MINIMUM MAINTENANCE SCHEDULE
1. AFTER EVERY SIGNIFICANT RUNOFF PRODUCING
RAINFALL EVENT AND AT LEAST MONTHLY:
1.1 INSPECT THE DETENTION BASIN SYSTEM
FOR SEDIMENT ACCUMULATION, EROSION, TRASH
ACCUMULATION, VEGETATED COVER, AND
GENERAL CONDITION.
1.2 CHECK AND CLEAR THE ORIFICE OF ANY
OBSTRUCTIONS THAT WOULD INTERFERE WITH
THE DRAW DOWN
OF THE TEMPORARY POOL AS DESIGNED.
2. REPAIR ERODED AREAS IMMEDIATELY. RE -SEED
THE EMBANKMENT AS NECESSARY TO MAINTAIN
GOOD VEGETATIVE COVER. MOW VEGETATIVE
COVER ON EMBANKMENT TO MAINTAIN A
MAXIMUM HEIGHT OF SIX INCHES, REMOVE
TRASH AS NEEDED.
3. INSPECT AND REPAIR THE COLLECTION SYSTEM
(I.E. CATCH BASINS, PIPING, SWALES, RIP RAP,
ETC.) QUARTERLY TO MAINTAIN PROPER
FUNCTIONING.
4. REMOVE WOODY VEGETATION NOT PART OF THE
APPROVED PLAN ALONG THE DAM EMBANKMENT.
5. REMOVE ACCUMULATED SEDIMENT FROM THE WET
DETENTION BASIN SYSTEM SEMI-ANNUALLY OR
WHEN THE DEPTH IS REDUCED TO 75% OF THE
ORIGINAL DESIGN DEPTH. REMOVED SEDIMENT
SHALL BE DISPOSED OF IN AN APPROPRIATE
MANNER AND SHALL BE HANDLED IN A MANNER
THAT WILL NOT ADVERSELY IMPACT WATER
QUALITY (I.E. STOCKPILING NEAR A WET
DETENTION BASIN OR STREAM, ETC.).
6. PERFORM ANNUAL INSPECTION OF THE BASIN
(ANNUAL INSPECTION REPORTS TO BE KEPT BY
THE OWNER). PRIOR TO INSPECTION NOTIFICATION
MUST BE GIVEN TO STORM WATER SERVICES.
NOTE
THE PRECAST MANUFACTURER IS TO PREPARE AND
SUBMIT TO THE ENGINEER DESIGN DETAILS AND
CALCULATIONS FOR THE STRUCTURES SHOWN
BASED ON THE DESIGN CRITERIA SPECIFIED. THE
DESIGN SHALL BE PERFORMED UNDER THE DIRECT
SUPERVISION AND SEALED BY A PROFESSIONAL
ENGINEER REFEREED IN THE STATE OF NORTH
CAROLINA EXPERIENCED IN THE DESIGN OF
PRECAST CONCRETE. THE DESIGN SHALL INCLUDE
PROVISION S FOR HANDLING STRESSES AND
CONSTRUCTION LOADS. REPRODUCED COPIES OF
ASTM C789 "STANDARD SPECIFICATIONS FOR
PRECAST REINFORCED CONCRETE BOX SECTIONS
FOR CULVERTS, STORM DRAINS, AND SEWERS" WILL
NOT BE ACCEPTED AS A SUBSTITUTED FOR DESIGN.
NOTE
NCDEQ WILL REQUIRE AN OPERATION AND
MAINTENANCE PLAN AND INSPECTION AND
MAINTENANCE AGREEMENT
u
EMBANKMENT CONSTRUCTION NOTES
GENERAL
1. THE POND AND DAM AREA SHALL BE CLEARED,
GRUBBED AND STRIPPED OF ALL VEGETATIVE
MATERIAL AND TOPSOIL PRIOR TO DAM
CONSTRUCTION, THE DISPOSAL OF TREES,
STUMPS, CONSTRUCTION DEBRIS, VEGETATIVE
MATERIAL, ETC. SHALL NOT BE PERMITTED IN
THE DAM OR POOL AREA OF THE POND. WHEN
BLASTING IS USED TO REMOVE ROCK FROM THE
POOL AREA, THE BLASTED AREA SHALL BE
OVER -EXCAVATED TO A DEPTH OF AT LEAST
TWO FEET (2) BELOW FINISH GRADE AND
BROUGHT BACK TO FINISH GRADE WITH CLEAN
RELATIVELY IMPERVIOUS SOIL MATERIAL
COMPACTED IN PLACE.
EARTH FILL DAMS
1. SOIL MATERIALS USED FOR EARTH FILL WHICH
ARE HIGHLY PERMEABLE OR WHICH EXHIBIT
SIGNIFICANT.
2. EMBANKMENTS FILL MATERIAL TO BE COMPACTED
TO AT LEAST 95% STANDARD PROCTOR
COMPACTION.
3. SHRINKAGE SWELL, OR DISPERSION SHALL NOT
BE USED IN THE EMBANKMENT.
4.A CUTOFF TRENCH (CORE TRENCH) SHALL BE
PROVIDED WITH A MINIMUM WIDTH OF FIVE FEET
(5'). THE CENTERLINE OF THE CUTOFF TRENCH
SHALL NOT BE LOCATED DOWNSTREAM OF THE
INSIDE TOP OF SLOPE OF THE DAM. THE
CUTOFF TRENCH SHALL BE CAREFULLY
BACK -FILLED WITH HIGHLY IMPERMEABLE
MATERIAL AND COMPACTED TO AT LEAST
NINETY-FIVE PERCENT (95%) OF STANDARD
PROCTOR DENSITY.
5. THE MINIMUM TOP WIDTH OF THE DAM SHALL BE
TEN FEET (10') AND SLOPES SHALL NOT BE
STEEPER THAN 2:1 (TWO HORIZONTAL TO ONE
VERTICAL) ON THE DAM OR EMBANKMENTS
AROUND THE POND.
6. ALL DISTURBED GROUND AREAS AND
EMBANKMENTS SURROUNDING THE POND SHALL
BE MECHANICALLY STABILIZED AND HAVE
PERMANENT GROUND COVER ESTABLISHED IN
ACCORDANCE WITH THE PERMANENT SEEDING
SCHEDULE.
BMP DATA TABLE
POND
SPILLWAY
POND ELEVATIONS
ID
BOTTOM
TOP
DEPTH
LENGTH (FT)
ELEV
PERM POOL
10-YR ELEV
25-YR ELEV
50-YR ELEV
WET POND 04
758 5
770 0
II 5
20
769
764 0
7680
766 6
7689
SAFETY FENCE
(ALONG PERIMETER)
POND SECTIONAL VIEW
STORMWgTER
BASIN LENGTH (SEE PLAN)
10' MINIMUM
�
TOP OF EMBANKMENT = 770.0
100-YR WATER SURFACE ELEVATION = 769.0
_ _ _ EMERGENCY SPILLWAY = 769.0
50=YR WATER SURFACE ELEVATION = 768.9
25-YR WATER SURFACE ELEVATION = 768.6
10=YR WATER SURFACE ELEVATION = 768.0
2-YR WATER SURFACE ELEVATION = 766.7
7•
EARTHEN DAM
INLET
-
MIN. 2'
r� 6' (TYP) _1
'
- _BASIN
- - -
VE6ETA rJvE SHELF
-
NORMAL WATER = 764.0
ANTI -SEEP COLLAR
6:1 SLOT,
SEE DETAIL.
C'
SHELF
RIP -RAP APRON
�
SEDIMENT s 5' PERMANENT
0 E AY B RN
vE6ET471vE
6:1 SLOPE
(SEE DETAIL)
TOP OF VEGETATIVE SHELF
FOREBAY POOL DEPTH
(SEE DETAIL
ELEV: 764.50
CL- RPRAP
STORAGE ELEV = 759.0
BASIN BOTTOM = 758.5
- - - - - - - - - -
- - - - -
------ -
STABIILIZATION
BOTTOM OF
VEGETATIVE SHELF
12" CLAY LINER SHALL BE CONSTRUCTED—/FOREBAY
EXIT
ELEV: 758.5
36" CLASS IV RCP
ELEV: 763.50
OR COMPACTED SUCH THAT INFILTRATION
INTER CONNECTED
FOREBAY ENTRANCE RATE IS NOT MORE THAN 0.01 IN/HR
PIPE X 2 WITH
ELEV: 758.0
WATERTIGHT JOINTS
WET DETENTION POND 4
NOTE: SEE GRADING PLAN SHEET C3 0
NOT TO SCALE SHWT TEST TO BE PREFORMED BEFORE THE POND IS CONSTRUCTED. FOR PIPE INVERTS, PIPE SIZE, AND PIPE
LENGTHS
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JOB NO:
DATE:
DRAWN:
J- 29101
1-II-22
NH
DESIGNED:
NH
REVIEWED:
WBS
APPROVED:
WBS
SCALE:
I" = 30'
C3*12..i
T T SCALE NOT TO SCALE