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STORMWATER PONDS ARE TO BE CONSTRUCTED FOR USE
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ASATEMPORARY SEDIMENT BASIN DURING CONSTRUCTION.
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SEDIMENT BASIN IS TO BE CLEANED UP AND SHAPED
PRIOR TO BE USED ASASTORMWATER POND.
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J/ �♦♦♦♦k /-/ t/ �` R=383.16' / \\�~ CONSTRUCTION SEQUENCE FOR WET DETENTION POND:
OD= 14'27'10" /\\
J / / _ _ - J C= 96.40' _ i 1. INSTALL EROSION CONTROLS
j♦♦ / n�/ -�--- iJ DOC= 14'57'12" / \ 2. CONSTRUCT DAM BASE AND AREAS BELOW THE NORMAL POOL. CONSTRUCTION TO BE ,
PERFORMED UNDER THE INSPECTION OF THE GEOTECHNICAL ENGINEER. SEED UPON �\
COMPLETION �j
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� 3. INSTALL OUTLET PIPE, RIPRAP APRON AND STONE FILTER RING.
4. CONSTRUCT OUTLET STRUCTURE, INSTALL TEMPORARY SKIMMER.
5. UPON COMPLETION AND STABILIZATION OF UPSTREAM DEVELOPMENT, REMOVE
f / / \ _ /\ SKIMMER, INSTALL PERMANENT ORIFICE DRAWDOWN DEVICE AND SEED UPON
\'t / // COMPLETION.
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STORMWATER
MANAGEMENT
EASEMENT
/ ( STORMWATER 7
MANAGEMENTS
EASEMENT ` /��\ \\ ��� /<���� A=3671' I �l
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VEGETATIVE SHELF PLANTINGS:
AREA OF VEGETATIVE SHELF: 2,846 SF
MIN. PLANTS REQUIRED: 712
PLANT TYPE:
SCIENTIFIC NAME:
EUPATORIADELPHUS MACULATUS
EUPATORIUM PURPUREUM
RHYNCHOSPORA COLORATA
170
168
166
164
162
160
158
156
154
152n
150
WET POND PLAN VIEW
SCALE: 1" = 30'
COMMON NAME: QUANTITY: NURSERY CONTAINER: SPACING: PLANTING SEASON:
SPOTTED TRUMPETWEED 238 PEAT POT 6' O.C. SPRING/SUMMER
JOE-PYE WEED 238 PEAT POT 6' O.C. SPRING/SUMMER
STARRUSH WHITETOP 238 PEAT POT 6' O.C. SPRING/SUMMER
TYPICAL VEGETATIVE SHELF DETAIL
�Y.1G1��i►�K.
EXISTING GROUND
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SCALE IN FEET
0' 10 20 40
BMP LANDSCAPE NOTES:
1. THE BMP LANDSCAPING SHALL BE IN COMPLIANCE WITH THE NCDEQ BMP
REQUIREMENTS.
2. LANDSCAPE CONTRACTOR SHALL PROVIDE A TWO-YEAR WARRANTY PERIOD. ALL
PLANTS THAT DO NOT SURVIVE MUST BE REPLACED.
3. AT THE END OF THE FIRST YEAR AND AT THE END OF THE TWO-YEAR WARRANTY
PERIOD, ALL PLANTS THAT DO NOT SURVIVE MUST BE REPLACED.
4. ESTABLISHMENT PROCEDURES SUCH AS CONTROL OF INVASIVE WEEDS, ANIMAL
AND VANDAL DAMAGE, MULCHING, AND WATERING SHALL BE IMPLEMENTED TO
THE EXTEND NEEDED TO ENSURE PLANT SURVIVAL.
5. SOD WITHIN BMP AND SURROUNDING AREAS TO BE CENTIPEDE GRASS.
6. GRASS OR WILDFLOWER SEED MUST BE APPLIED AT THE RATES SPECIFIED BY THE
SUPPLIERS. IF PLANT ESTABLISHMENT CANNOT BE ACHIEVED WITH SEEDING BY
THE TIME OF SUBSTANTIAL COMPLETION OF THE STORM WATER FACILITY PORTION
OF THE PROJECT, THEN THE CONTRACTOR SHALL PLANT THE AREA WITH
WILDFLOWER SOD, PLUGS, CONTAINER PLANTS, OR OTHER MEANS TO COMPLETE
THE SPECIFIED PLANTING AND PROJECT AGAINST EROSION BEFORE WATER IS
ALLOWED TO ENTER THE STORM WATER BMP FACILITY.
7. ALL MATERIALS SHALL BE ACQUIRED FROM AN APPROVED NCDEQ PLANT VENDOR.
PLANT MATERIAL SHOULD BE PURCHASED FROM A LOCAL SOURCE TO ENSURE
SURVIVABILITY.
8. IMMEDIATELY AFTER THE WET DETENTION BASIN IS ESTABLISHED, THE PLANTS ON
THE VEGETATED SHELF AND PERIMETER OF THE BASIN SHOULD BE WATERED TWICE
WEEKLY IF NEEDED UNTIL THE PLANTS BECOME ESTABLISHED (COMMONLY SIX
WEEKS).
9. NO PORTION OF THE WET DETENTION POND SHOULD BE FERTILIZED AFTER THE
FIRST INITIAL FERTILIZATION THAT IS REQUIRED TO ESTABLISH THE PLANTS ON THE
VEGETATED SHELF.
10. BMP PLANT SUBSTITUTIONS ARE NOT PERMITTED.
11. ONLY NON -CLUMPING TURF GRASSES SHALL BE USED. TREES AND WOODY SHRUBS
SHALL NOT BE ALLOWED ON THE DAM OR TOP OF SLOPE AREA/10' MAINTENANCE
AREA OF THE BMP.
OF BASIN:
167.50
6" TOP SOIL ABOVE
6" CLAY LINER ON
LITTORAL SHELF
50 YR EL: 16
.25'
25 YR EL: 16
.06'
TEMPORARY POOL
EL: 162.00
10 YR EL: 16
.86'
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_._._._._._._.
_4_._._._._._._.
._ _._._
L: 161.00'
......
BOTTOM
BOTTOM OF SHELF:
OF SHELF: 1
162.00'
1.00'
NORMAL POOL
SEDIMENT CL
ANOUT: 157.00'
EL: 156.00'
BO
TOM OF POND
i
6" CLAY SOIL LINER
MAIN POOL
DOUBLE GABION
BASKET WEIR FOR THE
FIRST 3 FEET.
TOP OF GABION EL = 162.00'
in o6
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in
0+00 0+50 1+00 1+50 2+00 2+50 3+00
WET POND PROFILE VIEW
SCALE: 1 = 50 HORZ. 1 = 5 VERT.
STORMWATER MANAGEMENT DESIGN WET DETENTION POND
DESIGN STORM
POST -RUNOFF
STORM STAGE
PRE -RUNOFF
POND OUTFLOW
1-YEAR (24 HR)
0.74 CFS
161.54 FT-MSL
0.30 CFS
0.07 CFS
10-YEAR
30.10 CFS
162.86 FT-MSL
12.04 CFS
11.63 CFS
25-YEAR
33.49 CFS
163.06 FT-MSL
13.39 CFS
12.42 CFS
50-YEAR
35.82 CFS
163.25 FT-MSL
14.33 CFS
13.15 CFS
100-YEAR
38.04 CFS
163.45 FT-MSL
15.22 CFS
13.86 CFS
DRAINAGE AREA TO POND: 14.61 AC.
SITE IMPERVIOUS AREA TO POND: 3.71 AC
170 NOTE:
ALL SEDIMENT DEPOSITED IN THE POND DURING
CONSTRUCTION MUST BE REMOVED, EROSION FEATURES
168 MUST BE REPAIRED, AND THE VEGETATED SHELF MUST BE
RESTORED, BEFORE OPERATION AS A STORMWATER BMP
BEGINS.
166
164 NOTE:
THE CONTRACTOR SHALL ENSURE THAT THE POND HAS A
MAXIMUM INFILTRATION OF 0.01 IN/HR. THIS MAY BE
162 ACCOMPLISHED BY RE -DISTRIBUTING EXISTING CLAYS OR
USING BORROW CLAY AS NECESSARY AS DIRECTED BY THE
GEOTECHNICAL ENGINEER.
160 THE CONTRACTOR SHALL HAVE A NC LICENSED
GEOTECHNICAL ENGINEER VERIFY A MAXIMUM OF 0.01
158 IN/HR INFILTRATION PRIOR TO CONVERTING THE
EXCAVATED AREA FROM A SEDIMENT BASIN TO A
PERMANENT WET DETENTION BASIN. IF 0.01 IN/HR
156 MAXIMUM INFILTRATION CANNOT BE MAINTAINED, A
PERMANENT LINER WILL NEED TO BE INSTALLED . IF A
LINER IS USE, THE SOIL MUST BE TESTED FOR INFILTRATION
154 RATE PRIOR TO INSTALLATION BY A NC LICENSED
GEOTECHNICAL ENGINEER.
152
SCALE IN FEET
MENNI
150 0' 25 50 100
.a'., S 86'54'21" E
126.20'
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N:548882.77
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20' DRAINAGE &
ACCESS
EASEMENT
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�N 86o57'55" W J /
6" TOPSOIL ABOVE
6" CLAY LINER ON TRASH RACK BY PLASTIC
LITTORAL SHELF SOLUTIONS INC. OR
EQUIVALENT
TOP OF RIM = 162.00'
TRASH RACK
2'-2" X 3.0' SEE MANUFACTURERS
PRECAST BOX SPECIFICATIONS FOR
4" PVC PIPE FOR DRAW
DOWN ORIFICE DETAILS
INV =161.00'
SEE DETAIL
15" RCP
INV OUT = WET POND -
160.00' V6� NOTE:
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....................................
CONCRETE SHALL BE
ELEV. - 158.00,
PLACED IN RISER AFTER
ANGLES ARE SECURE TO
BASE AND RISER
APPROXIMATE SIZE 3' X 4' CONC. BASE REINFORCED WITH
EXCAVATE AND BACKFILL WITH #4 BARS AT 12" O.C. TOP AND BOTTOM OF
COMPACTED FILL AS DIRECTED EACH DIRECTION. PROVIDE 3" MIN
BY GEOTECHNICAL ENGINEER CLEARANCE BETWEEN EDGE OF CONCRETE
AND STEEL REINFORCING.
CUTOFF TRENCH - OUTFALL DETAIL
SCALE: N.T.S.
12"<
#4 REBAR @12" OC
IN FRONT & REAR FACE
OF COLLAR. REBAR TO
HAVE 3" MIN. CONC. COVER
FROM EDGE OF FACE OF COLLAR
6.5'
3.25'
CONCRETE ANTI- SEEPAGE COLLAR
SCALE: N.T.S.
NOTES:
1) ALL CONCRETE TO BE 3000 PSI
NON -FLY ASH
2) APPLY 1/2" THICK WRAP OF
ASPHALTIC CEMENT AROUND
DISCHARGE PIPE 6" BEYOND PLANNED
SEEPAGE COLLAR ON BOTH SIDES
3) APPLY ADDITIONAL ASPHALTIC
CEMENT AT PIPE/SEEPAGE COLLAR
INTERFACE ON UPSTREAM FACES
4) TO BE FIELD INSPECTED BY
GEOTECHNICAL ENGINEER. ASPHALTIC
CEMENT TO MEET OR EXCEED
FEDERAL SPECIFICATION SS-153 TYP1:
ASTM-D-2822-75 TYPE 1.
4" PVC PIPE
STUBBEDINTO
OUTLET RISER
1. CONTRACTOR TO PROVIDE A PEAKED ROOF STRUCTURE TRASH
RACK BY PLASTIC SOLUTIONS INC. (877-87775727) OR
EQUIVALENT. 6" x 6" MAXIMUM GRATE OPENING
2. PROVIDE STEPS IN ALL DRAINAGE STRUCTURES DEEPER THAN 54".
LOCATE STEPS WITHIN REASONABLE PROXIMITY TO ACCESS POINT
(MANHOLE OR GRATE OPENING) WITHOUT INTERFERING WITH
PIPE ORIENTATIONS.
OUTLET
RISER 4" PVC PLUG
SCREW TYPE
C7TEMPORARY POOL EL. 162.00'
TEMPORARY
4" PVC POOL
TEE
NORMAL POOL EL. 161.00'
PERMANENT
POOL
2" DRAW DOWN
ORIFICE
DRAW DOWN ORIFICE DETAIL
SCALE: N.T.S.
INSPECTION AND MAINTENANCE PROVISIONS
BMP ELEMENT
POTENTIAL PROBLEM
HOW TO REMEDIATE THE PROBLEM
THE ENTIRE BMP
TRASH/DEBRIS IS PRESENT.
REMOVE THE TRASH/DEBRIS.
THE PERIMETER OF
AREAS OF BARE SOILAND/OR
REGRADE THE SOIL IF NECESSARY TO
THE WET DETENTION
EROSIVE GULLIES HAVE FORMED.
REMOVE THE GULLY, AND THEN PLANT
BASIN
GROUND COVER AND WATER UNTIL IT IS
ESTABLISHED. PROVIDE LIME AND A ONE-
TIME FERTILIZER APPLICATION.
VEGETATION IS TOO SHORT OR
MAINTAIN VEGETATION AT A HEIGHT OF
TOO LONG.
APPROXIMATELY SIX INCHES.
THE INLET DEVICE:
THE PIPE IS CLOGGED.
UNCLOG THE PIPE. DISPOSE OF THE
PIPE OR SWALE
SEDIMENT OFF -SITE.
THE PIPE IS CRACKED OR
REPLACE THE PIPE.
OTHERWISE DAMAGED.
EROSION IS OCCURRING IN THE
REGRADE THE SWALE IF NECESSARY TO
SWALE.
SMOOTH IT OVER AND PROVIDE EROSION
CONTROL DEVICES SUCH AS REINFORCED
TURF MATTING OR RIPRAP TO AVOID
FUTURE PROBLEMS WITH EROSION.
THE FOREBAY
SEDIMENT HAS ACCUMULATED TO
SEARCH FOR THE SOURCE OF THE
A DEPTH GREATER THAN THE
SEDIMENT AND REMEDY THE PROBLEM IF
ORIGINAL DESIGN DEPTH FOR
POSSIBLE. REMOVE THE SEDIMENT AND
SEDIMENT STORAGE.
DISPOSE OF IT IN A LOCATION WHERE IT
WILL NOT CAUSE IMPACTS TO STREAMS OR
THE BMP.
EROSION HAS OCCURRED.
PROVIDE ADDITIONAL EROSION PROTECTION
SUCH AS REINFORCED TURF MATTING OR
RIPRAP IF NEEDED TO PREVENT FUTURE
EROSION PROBLEMS.
WEEDS ARE PRESENT.
REMOVE THE WEEDS, PREFERABLY BY
HAND. IF PESTICIDE IS USED, WIPE IT ON
THE PLANTS RATHER THAN SPRAYING.
THE VEGETATED
BEST PROFESSIONAL PRACTICES
PRUNE ACCORDING TO BEST PROFESSIONAL
SHELF
SHOW THAT PRUNING IS NEEDED
PRACTICES.
TO MAINTAIN OPTIMAL PLANT
HEALTH.
PLANTS ARE DEAD, DISEADED OR
DETERMINE THE SOURCE OF THE
DYING.
PROBLEM: SOILS, HYDROLOGY, DISEASE,
ETC. REMEDY THE PROBLEM AND REPLACE
PLANTS. PROVIDE ONE-TIME FERTILIZER
APPLICATION TO ESTABLISH THE GROUND
COVER IF A SOILTEST INDICATES IT IS
NECESSARY.
WEEDS ARE PRESENT.
REMOVE THE WEEDS, PREFERABLY BY
HAND. IF PESTICIDE IS USED, WIPE IT ON
THE PLANTS RATHER THAN SPRAYING.
THE MAIN TREATMENT
SEDIMENT HAS ACCUMULATED TO
SEARCH FOR THE SOURCE OF THE
AREA
A DEPTH GREATER THAT THE
SEDIMENT AND REMEDY THE PROBLEM IF
ORIGINAL DESIGN SEDIMENT
POSSIBLE. REMOVE THE SEDIMENT AND
STORAGE DEPTH.
DISPOSE OF IT IN A LOCATION WHERE IT
WILL NOT CAUSE IMPACTS TO STREAMS OR
THE BMP.
ALGAL GROWTH COVERS OVER
CONSULT A PROFESSIONALTO REMOVE
50%OF THE AREA.
AND CONTROL THE ALGAL GROWTH.
CATTAILS, PHRAGMITES OR OTHER
REMOVE THE PLANTS BY WIPING THEM
INVASIVE PLANTS COVER 50%OF
WITH PESTICIDE (DO NOT SPRAY).
THE BASIN SURFACE.
THE EMBANKMENT
SHRUBS HAVE STARTED TO GROW
REMOVE SHRUBS IMMEDIATELY.
ON THE EMBANKMENT.
EVIDENCE OF MUSKRAT OR
USE TRAPSTO REMOVE MUSKRATSAND
BEAVER ACTIVITY IS PRESENT.
CONSULT A PROFESSIONALTO REMOVE
BEAVERS.
A TREE HAS STARTED TO GROW
CONSULT A DAM SFETY SPECIALIST TO
ON THE EMBANKMENT.
REMOVE THE TREE.
AN ANNUAL INSPECTION BY AN
MAKE ALL NEEDED REPAIRS.
APPROPRIATE PROFESSIONAL
SHOWS THAT THE EMBANKMENT
NEEDS REPAIR.
THE OUTLET DEVICE
CLOGGING HAS OCCURRED.
CLEAN OUT THE OUTLET DEVICE. DISPOSE
OF THE SEDIMENT OFF -SITE.
THE OUTLET DEVICE IS DAMAGED.
REPAIR OR REPLACE THE OUTLET DEVICE.
THE RECEIVING WATER
EROSION OR OTHER SIGNS OF
CONTACT THE NC DIVISION OF WATER
DAMAGE HAVE OCCURRED AT THE
QUALITY WASHINGTON REGIONAL OFFICE, OR
OUTLET.
THE 401 OVERSIGHT UNIT, 919-733-1786.
STORM WATER MANAGEMENT NOTES:
1. THE DEVELOPER OR HIS AGENT SHALL CONTACT THE DESIGN ENGINEER WHEN
THE BEST MANAGEMENT PRACTICES ARE CONSTRUCTED AND ABOUT TO BECOME
OPERATIONAL SO THAT A FINAL INSPECTION CAN BE PERFORMED TO DETERMINE
COMPLIANCE WITH THE APPROVED PLAN.
2. ANNUAL MAINTENANCE INSPECTION AND REPORT REQUIRED. THE OWNER OF A
PERMITTED STRUCTURAL STORM WATER BMP SHALL ANNUALLY SUBMIT A
MAINTENANCE AND INSPECTION REPORT FOR EACH BMP TO THE STORM WATER
ADMINISTRATOR. ANNUAL INSPECTIONS SHALL BEGIN WITHIN ONE YEAR OF THE
RECORDATION OF ANY DEED(S) SHOWING STORM WATER BMPS.
3. UPON COMPLETION OF THE PROJECT, THE ENGINEER OF RECORD SHALL CERTIFY
THAT THE COMPLETED PROJECT IS IN ACCORDANCE WITH THE APPROVED STORM
WATER MANAGEMENT PLANS AND DESIGNS.
4. A FINAL INSPECTION OF THE SITE AND STORM WATER BMP SHALL BE SCHEDULED
WITH AND COMPLETED BY THE PROJECT ENGINEER.
5. NCDEQ AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE STORM WATER
CONTROLS FOR INSPECTIONS OR MAINTENANCE AS NECESSARY.
6. THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORM WATER
CONTROLS ACCORDING TO THE APPROVED MAINTENANCE PLAN AND DIRECTION
OF NCDEQ.
BMP MAINTENANCE:
Important operation and maintenance procedures:
1. Immediately after the wet pond is established, the plants on the vegetated shelf
and perimeter of the basin will be watered twice weekly if needed, until the
plants become established (commonly six weeks).
2. No portion of the wet pond will be fertilized after the first initial fertilization
that is required to establish the plants on the vegetated shelf.
3. Stable ground cover will be maintained in the drainage area to reduce the
sediment load to the wet pond.
4. If the pond must be drained for an emergency or to perform maintenance, the
flushing of sediment through the emergency drain will be minimized as much as
possible.
5. Once a year, a dam safety expert should inspect the embankment.
6. The measuring device used to determine the sediment elevation shall be such
that it will give an accurate depth reading and not readily penetrate into
accumulated sediments.
After the wet pond is established, it should be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County)..
Records of operation and maintenance will be kept in a known set location and shall
be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
FLOW
NOTES:
1) PRIOR TO INSTALLATION, MANUFACTURER SPECIFICATIONS
OF FILTER MEDIA SHALL BE REVIEWED TO ENSURE THAT
DISCHARGE FROM FILTER MEDIA SHALL MEET OR EXCEED
THE PROVISIONS OF THE CLEAN WATER ACT.
2) ENSURE THAT PUMP PRESSURE DOES NOT EXCEED FILTER
MEDIA PRESSURE RATING.
3) FILTER MEDIA MAY BE, BUT NOT LIMITED TO, SAND MEDIA
FILTRATION PRACTICES.
4) PUMP STRAINER SHALL NOT BE IN CONTACT WITH BOTTOM
OF POND.
PUMP
TA
WATER LEVEL
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INFILTRATION BASIN DEWATERING
SCALE: N.T.S.
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DESIGNED BY.
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DRAWN BY.
APPROVED BY.
JEH
SHEET.
C8.0
CIVIL