SW4210702_Plansheet - SCM Detail_20210729

607.90
100 YR. FLOOD STAGE
10 YR. FLOOD STAGE 606.66
2 YR. FLOOD STAGE 606.00
6' VEG. SHELF (10H/1 V)
1 YR. FLOOD STAGE 605.75
T/SHELF 604.50 g�
TEMP. BAFFLES TO REMAIN IN
B/SHELF 603.50
SHELF
PLACE DURING CONSTRUCTION
3
FOREBAY SEE PLAN
1
INSTALL AFTER ALL AREAS DRAINING
INTO POND ARE STABILIZED
FLOODWATER STAGE
TEMP. W.Q. STORAGE
1'
3'
3'
0
>
RIPRAP OUTLET FROM PIPE
TO BOTTOM OF POND
NOTE - VOLUME BELOW 8"0 DRAIN
PIPE
IS TO BE PUMPED OUT AT TIME OF
CLEANING OR DURING MAINTENANCE.
V THK. NCDOT
#57 STONE
605.50
EL. 604.00 NP
RISER - SEE
DETAIL
CONSTRUCT DAM WITH IMPERMEABLE SOILS.
COMPACTED TO 98% STD. PROCTOR DENSITY W/ A
MOISTURE CONTENT OF -1% TO +3% OF OPTIMUM.
SOILS SHALL BE UNIFORM IN CHARACTER &
INSTALLED IN 8" MAXIMUM LIFTS. SOILS SHALL BE
FREE OF ORGANICS & PARTICLES OF 2" OR GREATER.
EL. 600.00 10' 6' 10'
MIN. HEL MIN.
3' 3'
EL
V_j
INV.
2 E. 599.00 EL. 608.00 PROPOSED STM MH 47
TOP = 603.89
- - = 598.01
2
MAX SLOP
2 PERM. W.Q. STORAGE z 3
1 L �
PE M. SEDIMENT STORAGE 1 L J 1
NCDOT CLASS B STONE, b 1 1 18" RCP TO STM 48
INSTALL DURING TRANSITION N INV. = 597.81
FROM SED. BASIN TO WET 2' 2'
DETENTION POND 99.46 LF 18"0 CAP ® 1.00
CUT-OFF TRENC
BACKFILL W/IMPERMEABLE
SOILS COMPACTED TO -RISER NOTE-
95% STD. PROCTOR DENSITY THE RISER IS DESIGNED FOR THE 100 YR. STORM AND IS
THE EMERGENCY SPILLWAY.
WET DETENTION POND / SEDIMENT BASIN -NOTE-
DETAIL TEMPORARY SEDIMENT BASIN SHALL BE COMPLETELY CLEANED OF SEDIMENT
AND UPGRADED TO FUNCTION AS PERMANENT DETENTION POND AFTER ALL PERMANENT
NO SCALE EROSION CONTROL METHODS ARE ESTABLISHED AS INDICATED ON FINAL SITEWORK
PACKAGE DRAWINGS.
30'0 X 4.25' HIGH
ALUM. EXPANDED
METAL TRASH
GUARD TOP
FLOODWATER STORAGE
EL. 607.91
TOP OF RISER
EL. 605.50
Uo
NORMAL POND LEVEL - EL. 604.00
SUPPORT
BRACKET,
SEE DIET.
POND
EL. 600.00 SEDIMENT LEVEL
1.0'
EL. 599.00 -_
NOTE - VOLUME BELOW 8"0 DRAIN PIPE
IS TO BE PUMPED OUT AT TIME OF
CLEANING OR DURING MAINTENANCE.
NOTE -
DRAWING NOT TO SCALE.
8"0 DRAIN
777-1
I I l-
INV=733.50 'b
4.0' 4.5'x4.5'
-ROM TOE OF DAM
POND RISER
(10 YEAR DESIGN STORM)
(1 REQUIRED)
DETAIL
#4 ® 6" O.C. E.W.
9- 1 /A" THK- ANTI-VORTFx
ORIFICE, 1.5"0
30"
CAP
HELICAL ALUM.
14 GAGE PIPE
10.00 Q10= 20.48 CFS
FLANGE JOINTS WITH
3/8" NEOPRENE
GASKET
ANCHOR INTO CONC.
DAM
15" TYPICAL VARIES
13" TYPICAL VARIES
CD CD
5/8" DIA. HOLES
9' SST U-BOLT W/DBL. NUTS
TO STABILIZE LIFT ROD
FOR GATE
CONTRACTOR TO ATTACH TO ALUM. RISER
LIFT ROD SUPPORT BRACKET
DETAIL
NO SCALE
INLET ORIFICE
2" VENT WITH BLUE TIP
" 3" PVC FLOAT
2 SCH. 40 SOLID PVC BARREL
OR "ARM" SUPPLIED BY USER
. , e%^Ii 1 A n
ALUMINUM STRAPS
SUSPENDING INLET
,29 "-
3" INLET EXTENSIONS `5"' HEAD ON CEN IEH
OF INLET AND
2" HOSE, SS CLAMPS ORIFICE
2" THREADED MALE PATENT #5,820,751
NIPPLE ON OUTLET END
3" FAIRCLOTH
SKIMMER DETAIL
NO SCALE
NOT TO
SCALE
WET DETENTION POND
CALCULATIONS
ON -SITE
OFF -SITE TOTAL
TOTAL PROPOSED
TEMP. W.Q.
TEMP. W.Q.
POND DRAINAGE
DRAINAGE DRAINAGE
BUILT -UPON
AVG. PERM. W.Q.
POND AREA
POND AREA STORAGE
STORAGE
PERMANENT POOL PERMANENT SEDIMENT PERMANENT SEDIMENT FOREBAY VOLUME FOREBAY VOLUME
W.Q. W.Q. RELEASE
WEIR
No. AREA
AREA AREA
AREA
STORAGE DEPTH
SA/DA REQUIRED
PROVIDED REQ'D.
PROVIDED
VOLUME STORAGE REQUIRED STORAGE PROVIDED REQUIRED (15%-20%) PROVIDED
OUTLET TIME RISER
BARREL
LENGTH
1 6.29 AC.
0.00 AC. 6.29 AC.
3.90 AC.
3.48 FT (AVG.)
2.01 5507 SF
5800 SF 13883 CF
14303 CF
24768 CF 6"-12" 13 3715 CF-4954 CF 4756 CF
1.5"0 2.26 DAYS 30"0 ALUM.
18"0 ALUM.
7.85' (RISER)
* PIPE SHALL BE 14
GAGE HELICAL ALUMINUM
CONSTRUCTION SEQUENCE FOR WET POND
ET POND CONSTRUCTION NOTES
1.
CLEAR AREA FOR POND AND POND DAM.
1.
FILTER DIAPHRAGM SHALL BE INSTALLED IN ACCORDANCE WITH THE REQUIREMENTS OF THE
2.
BEGIN CONSTRUCTION OF POND DAM BEGINNING WITH THE INSTALLATION OF THE
CITY OF GREENSBORO.
DAM'S CUT OFF TRENCH AS SHOWN ON C2.4 OF THE APPROVED DRAWINGS.
3•
2.
ALL AREAS LOCATED ALONG AND ABOVE THE POND BENCH SHALL RECEIVE A MINIMUM OF 4
4.
CONTINUE WITH THE DAM CONSTRUCTION, AND INSTALL THE DAM'S RISER AND
INCHES OF TOPSOIL AND BE PERMANENTLY SEEDED. SOIL STABILIZATION BLANKET SHALL BE
BARREL KIT AND ANTI SEEP PLATES AS THE GRADING PROGRESSES. COMPACT
APPLIED TO ALL AREAS WITH A FINISHED GRADE OF 6/1 OR GREATER. ALL METHODS AND
SOILS WITHIN DAM AND AROUND BARREL AS INDICATED WITHIN THE POND DETAILS
MATERIALS FOR SOIL STABILIZATION BLANKET SHALL BE IN ACCORDANCE WITH THE NORTH
AND WET POND CONSTRUCTION NOTES.
CAROLINA EROSION AND SEDIMENTATION CONTROL MANUAL. SODDING MAY BE SUBSTITUTED
IN PLACE OF SOIL STABILIZATION BLANKET.
5.
INSTALL OUTLET STABILIZATION DEVICE AT THE POND BARREL OUTLET AS INDICATED
3.
THE BOTTOM OF THE BASIN AND THE SIDE SLOPE UP TO 18 INCHES ABOVE THE WATER
ON THE PLANS.
SURFACE ELEVATION SHALL BE OVER EXCAVATED BY A MINIMUM OF 12 INCHES AND
6.
ONCE THE POND DAM IS CONSTRUCTED AND THE POND AREA HAS BEEN EXCAVATED
REPLACED WITH A LAYER OF SILTY CLAY (CL) UNLESS OTHERWISE DIRECTED BY THE
AS INDICATED ON THE PLANS, STABILIZE DISTURBED AREAS, AND DAM FACE WITHIN
GEOTECHNICAL ENGINEER. THE SILTY CLAY LAYER SHALL BE PLACED ON APPROVED
14 DAYS OF REACHING FINISHED GRADE.
SUBGRADES IN MAXIMUM 8 INCH LOOSE LAYER LIFTS AND SHALL BE COMPACTED TO AT
LEAST 90 PERCENT OF THE STANDARD PROCTOR COMPACTION. COMPACTION SHALL BE ON
5.
SET UP POND AS A TEMPORARY SEDIMENT BASIN FOR EROSION CONTROL PURPOSES.
THE WET SIDE OF THE OPTIMUM MOISTURE CONTENT.
4.
ALL BASINS SHALL FUNCTION AS A TEMPORARY SEDIMENT BASIN DURING CONSTRUCTION.
6.
AS GRADING ON SITE PROGRESSES AND STORMDRAIN NETWORK IS INSTALLED,
UPON COMPLETION OF CONSTRUCTION, THE BASINS SHALL BE CLEANED OF SEDIMENT AND
INSTALL THE REQUIRED OUTLET STABILIZATION STRUCTURES WITHIN THE POND AS
CONVERTED TO A STRRMWATER MANAGEMENT FACILITY.
INDICATED ON THE PLANS.
5.
THE CONTRACTOR SHALL ENGAGE THE SERVICES OF A STATE REGISTERED LAND SURVEYOR TO
7.
ONCE BUILDING CONSTRUCTION IS COMPLETE AND ALL AREAS DRAINING TO POND
PROVIDE AN AS -BUILT AND VOLUME COMPUTATIONS OF THE STORMWATER MANAGEMENT
HAVE BEEN STABILIZED WITH PERMANENT VEGETATION, FINE GRADE MAKING SURE
FACILITY AND SHALL PROVIDE THE AS -BUILT TO THE OWNER AND ENGINEER.
POND BOTTOM, SHELF, AND DAM ARE AT THE ELEVATIONS AS INDICATED ON THE
APPROVED DRAWINGS.
6.
THE BERMS AROUND THE POND(S) SHALL BE CONSTRUCTED OF COMPACTED STRUCTURAL FILL
8.
CLEAN ACCUMULATED SEDIMENT OUT OF BASIN PRIOR TO CONVERTING TO BMP/SCM.
CLASSIFIED AS SM, SM-SP, SP, SC OR BETTER CONTAINING LESS THAN 30% BY WEIGHT SILT
OF CLAY AND FREE OF DEBRIS. THIS MATERIAL SHALL BE PLACED ON APPROVED
SUBGRADES AND IN HORIZONTAL LIFTS NOT EXCEEDING 8 INCHES IN LOOSE THICKNESS
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INSTALL STONE FOREBAY BAFFLE AND REMOVE E&SC BAFFLES FROM POND.
MOISTURE CONDITIONED TO WITHIN -1% TO +3% OF OPTIMUM MOISTURE CONTENT AND
COMPACTED TO MINIMUM OF 95% OF THE MAXIMUM DENSITY OBTAINED IN ACCORDANCE ASTM
10.
CLEAN ALL RIP RAP ENERGY DISSIPATERS INTO POND AND BELOW POND DAM OF
D698 STANDARD PROCTOR METHOD. SOILS SHALL BE FREE OF ORGANICS AND ANY
ANY SEDIMENT, REPLACING RIP RAP IF REQUIRED.
PARTICLES LARGER THAN 2" IN DIAMETER. EACH LIFT OF BERM SHALL BE SCARIFIED
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PARALLEL TO THE BERM CREST AXIS TO A DEPTH OF 3 INCHES BEFORE PLACEMENT OF THE
11.
DISPOSE OF THE SEDIMENT REMOVED FROM THE POND BOTTOM WITHIN AN APPROVED
COMPACTED STRUCTURAL FILL. STRUCTURAL FILL SHALL BE ANALYZED AND APPROVED BY
LOCATION.
THE PROJECT GEOTECHNICAL ENGINEER PRIOR TO USE ON EMBANKMENT. AT ALL TIMES
DURING THE CONSTRUCTION OF BMP EMBANKMENT, THE CONTRACTOR SHALL ENSURE THAT
12.
CLOSE 8" DRAIN VALVE AND REMOVE SKIMMER FROM POND.
THE GEOTECHNICAL INSPECTOR IS PRESENT AND OBSERVING THE INSTALLATION.
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13.
PLANT VEGETATED SHELF AS REQUIRED.
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7.
BEFORE THE PLACEMENT OF THE COMPACTED STRUCTURAL FILL FOR THE BERM THE
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SUBGRADES SHALL BE INSPECTED BY A GEOTECHNICAL ENGINEER. UNSUITABLE SOILS
14.
13. ALLOW POND TO FILL TO NORMAL POOL ELEVATION FROM STORM RUNOFF.
1-1
CONTAINING BUILDING RUBBLE AND OTHER DEBRIS SHALL BE REMOVED FORM THE BERM AREA.
SUITABLE, COMPACTED BERM FILL SUBGRADE SHALL BE SCARIFIED PARALLEL TO THE BERM
SEDIMENT TRAP AND SEDIMENT BASIN MAINTENANCE NOTES
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CREST AXIS TO A DEPTH OF 3 INCHES BEFORE PLACEMENT OF THE COMPACTED STRUCTURAL
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ALL.
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1.
INSPECT TEMPORARY SEDIMENT TRAPS AND SEDIMENT BASINS AT LEAST WEEKLY AND AFTER
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8.
THE GEOTECHNICAL ENGINEER SHALL DETERMINE MATERIALS SUITABLE FOR STRUCTURAL FILL.
EACH SIGNIFICANT(<<" OR GREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY.
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9.
SEED ALL SIDE SLOPES AND EMBANKMENTS PER THE SEEDING SCHEDULE SHOWN ON SHEET
2.
WHEN SEDIMENT REACHES ONE-HALF THE DESIGN DEPTH OF THE TRAP OR BASIN, REMOVE
I
C2.1
SEDIMENT AND RESTORE TRAP OR BASIN TO ITS ORIGINAL DIMENSIONS. PLACE SEDIMENT
(3'
3
THAT IS REMOVED IN A DESIGNATED DISPOSAL AREA.
10.
STABILIZE SIDE SLOPES AND EMBANKMENTS GREATER THAN 3/1 PER THE NCDENR EROSION
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AND SEDIMENTATION CONTROL MANUAL.
3.
REPLACE ANY PART OF THE GRAVEL FACING THAT IS IMPAIRED BY SEDIMENT.
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11.
INSTALLATION SHALL BE IN GENERAL CONFORMANCE WITH NCDENR STATE STORMWATER
4.
PERIODICALLY CHECK THE DEPTH OF THE SPILLWAY TO ENSURE IT IS A MINIMUM OF 1.5 FEET
QMANUAL
LATEST EDITION.
BELOW THE LOW POINT OF THE EMBANKMENT.
C.
5.
IMMEDIATELY FILL ANY SETTLEMENT OF THE EMBANKMENT TO SLIGHTLY ABOVE DESIGN
a
MP LANDSCAPING
GRADE.
I
j1.
A DETAILED LANDSCAPE PLAN PREPARED BY A QUALIFIED DESIGN PROFESSIONAL SHALL BE
6.
ANY RIP -RAP DISPLACED FROM THE SPILLWAY MUST BE REPLACED IMMEDIATELY.
SUBMITTED PRIOR TO CONSTRUCTION.
A SOIL SAMPLE/ANALYSIS MAY BE REQUIRED PRIOR TO PLANT SELECTION TO ENSURE
STORMWATER NOTES
j2.
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GROWTH AND PERFORMANCE.
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1.
THE ENGINEER'S CERTIFICATION OF COMPLETION WILL BE REQUIRED PRIOR TO THE FINAL
of
SOIL MAY REQUIRE ADDITIONAL ENRICHMENT TO ENSURE PLANT GROWTH AND
PLAT OF CERTIFICATE OF OCCUPANCY. THE STORMWATER CONTROL IS TO BE INSPECTED TO
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PERFORMANCE.
ENSURE IT IS FUNCTIONING AS DESIGNED AND HAS FULL DESIGN VOLUME PRIOR TO
•5
ISSUANCE OF THE FINAL CERTIFICATE OF OCCUPANCY.
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4.
SOIL SHALL NOT BE COMPACTED PRIOR TO PLANTING.
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2.
THE PROPERTY OWNER IS RESPONSIBLE FOR MAINTAINING THE STORMWATER CONTROL
•
PLANTS SELECTED SHALL BE OF RANDOM DIVERSITY AND DENSITY TO ENSURE SURVIVAL.
ACCORDING TO THE APPROVED MAINTENANCE PLAN AND DIRECTION OF THE NCDEQ
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6.
NO TREES OR SHRUBS SHALL BE PLANTED WITHIN 10 FEET OF INLET OR OUTLET PIPES, OR
3.
NCDEQ AND THEIR ASSIGNS HAVE RIGHT TO ACCESS THE STORMWATER CONTROL FOR
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MANHOLE DRAINAGE STRUCTURES SUCH AS SPILLWAYS OR FLOW SPREADERS.
INSPECTIONS OR MAINTENANCE, AS NECESSARY.
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7.
LANDSCAPING SHALL BE WATERED FOR THE FIRST YEAR AFTER PLANTING.
4.
ALL NECESSARY APPROVALS HAVE BEEN/WILL BE OBTAINED FROM THE STATE/CORPS FOR
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ANY WETLAND DISTURBANCE, STREAM CROSSING/DISTURBANCE.
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B.
A MINIMUM TWO-YEAR WARRANTY PERIOD SHALL BE PROVIDED STIPULATING REQUIREMENTS
jFOR
PLANT SURVIVAL/REPLACEMENT.
5.
IN ACCORDANCE WITH GS-143-215.25A AND 143-215.26 OF THE NC DAM SAFETY LAW AND
ADMINISTRATIVE CODE 15A NCAC 2K.0200, THE STATE DAM SAFETY OFFICE HAS BEEN/WILL BE
CONTACTED FOR DETERMINATION OF THE HAZARD CLASSIFICATION OF THE PROPOSED DAM.
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WET DETENTION POND OPERATION & MAINTENANCE
A. THE FOLLOWING TASKS SHALL BE PERFORMED AFTER EVERY RUN-OFF PRODUCING
RAINFALL EVENT, OR MONTHLY AS A MINIMUM.
1. REMOVE DEBRIS FROM TRASH RACK.
2. CHECK/CLEAR OBSTRUCTIONS FROM ORIFICE OUTLET.
3. CHECK POND SIDE SLOPES AND DAM EMBANKMENT. REMOVE TRASH AND REPAIR
ERODED AREAS.
4. CHECK SEDIMENT LEVELS BEHIND BAFFLES. REMOVE SEDIMENT WHEN DEPTH
REACHES 1/2 BAFFLE HEIGHT.
B. THE FOLLOWING TASKS SHALL BE PERFORMED EVERY THREE MONTHS.
1. INSPECT STORMWATER COLLECTION SYSTEM (PIPING, STRUCTURES, SWALES) FOR
PROPER OPERATION. REMOVE TRASH, SEDIMENTS & OBSTRUCTIONS FROM SYSTEM.
2. INSPECT RIPRAP ENERGY DISSIPATORS FOR EROSION AND UNDERCUTTING. REPAIR
AS REQUIRED.
3. REPAIR ERODED AREAS AND RESEED BARE SPOTS THROUGHOUT, TO REDUCE
SEDIMENT GENERATION.
4. INSPECT POND OUTLET DEVICES AND CHANNEL DOWNSTREAM OF DAM. REPAIR
UNDERCUTTING OR DAMAGE TO CHANNEL LINING.
5. CHECK DOWNSTREAM DAM FACE FOR EVIDENCE OF SEEPAGE OR OVERTOPPING.
C. THE FOLLOWING TASKS SHALL BE PERFORMED EVERY SIX MONTHS.
1. INSPECT INTERIOR OF OUTLET STRUCTURE. REMOVE ACCUMULATED SEDIMENTS OR
OBSTRUCTIONS.
2. CHECK POND DEPTH AT VARIOUS LOCATIONS. REMOVE ACCUMULATED SEDIMENTS IF
DEPTH IS LESS THAN 3/4 SPECIFIED.
3. CLEAR TREES AND SAPLINGS FROM DAM EMBANKMENT.
D. GENERAL
1. MOW POND SIDES REGULARLY TO MAINTAIN MAXIMUM GRASS HEIGHT OF 6".
2. REMOVE VEGETATION WHICH GROWS WITHIN POND, EXCEPT WETLAND GRASSES
ALONG PERIMETER.
3. MONITOR POND DRAWDOWN TIME. IF DRAWDOWN EXCEEDS TABULATED TIME,
REMOVE OBSTRUCTIONS FROM RISER ORIFICE.
4. INSPECT EMERGENCY SPILLWAY. REPAIR ERODED AREAS AND REMOVE
OBSTRUCTIONS.
STM 30 1
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STM 26
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STORMPIN
POND PLAN
HIGH MARSH 1166 SF
Plant requirement - 50/200 sf. Plants provided -
292
HERBACIOUS SCHEDULE
Scientific Name
Common Name
Size
Quantity
Carex Tenera
Quill Sedge
1 qt
97
HERBACIOUS SCHEDULE
Scientific Name
Common Name
Size
Quantity
Iris Virginica
Blue Flag Iris
1 qt
91
Juncus Effusus
Soft Rush
1 qt
91
Sagittaria Latifolia
Duck Potato
1 qt
91
"= 20'
POND VEGETATION NOTE(MDC 11)
THE FOLLOWING CRITERIA APPLY TO VEGETATION IN AND AROUND THE WET POND:
A. THE DAM STRUCTURE, INCLUDING FRONT AND BACK EMBANKMENT SLOPES,
OF THE POND SHALL BE VEGETATED WITH NON -CLUMPING TURF GRASS; TREES AND
WOODY SHRUBS SHALL NOT BE ALLOWED; AND
B. THE VEGETATED SHELF SHALL BE PLANTED WITH A MINIMUM OF THREE
DIVERSE SPECIES OF HERBACEOUS, NATIVE VEGETATION AT A MINIMUM DENSITY OF
50 PLANTS PER 200 SQUARE FEET OF SHELF AREA.
MAINTENANCE SCHEDULE FOR WETLANDS/VEGETATED SHELF
DESCRIPTION
METHOD
FREQUENCY
TIME OF THE YEAR
SOIL
INSPECT AND REPAIR
VISUAL
MONTHLY
MONTHLY
EROSION
ORGANIC LAYER
REMULCH ANY VOID AREAS
BY HAND
WHENEVER NEEDED
WHENEVER NEEDED
REMULCH PLANTING AREAS
BY HAND
ONCE A YEAR
SPRING
REMOVE DEBRIS AND ALL
FLOATABLE MATERIALS.
BY HAND
WHENEVER NEEDED.
WHENEVER NEEDED.
CHECK FILTRATION RATE.
VISUALLY
EVERY SIX MONTHS
SPRING/FALL
INSPECT PAVEMENT/GRASS INTERFACE
FOR CRACKING -BREAKAGE.
VISUALLY
MONTHLY.
MONTHLY
PLANTS
PLANTING DATES
3-15 TO 4-30 AND
10-1 TO 11-30
REMOVAL AND REPLACEMENT
OF ALL DEAD AND DISEASED
SEE PLANTING
TWICE A YEAR
3-15 TO 4-30 AND
VEGETATION CONSIDERED
SPECIFICATIONS
10-1 TO 11-30
BEYOND TREATMENT
TREAT ALL DISEASED
MECHANICAL OR
N/A
VARIES DEPENDS ON INSECT
TREES AND SHRUBS
BY HAND
OR DISEASE INFESTATION
WATERING OF PLANT MATERIAL
SHALL TAKE PLACE AT THE
END OF EACH DAY FOR 14
BY HAND
IMMEDIATELY AFTER
N/A
CONSECUTIVE DAYS AFTER
PLANTING HAS BEEN COMPLETED.
REPLACE DEAD PLANTS AFTER TWO
YEARS
BY HAND
ONCE A YEAR
WATERING OF PLANT MATERIAL
BY HAND
WEEKLY
3-15 TO 10-30
ENGINEER'S CERTIFICATION OF STORMWATER QUALITY CONTROL
o
I certify that, pursuant to generally accepted engineering standards in the
community, it Is my professional opinion that runoff from the first inch of
rainfall from areas that are required to be controlled per section 30-7-1.12
of the Greensboro Development Ordinance is controlled by a permanent
engineered stormwater quality control that has been designed to meet or
exceed the requirements in the Greensboro stormwater Management Manual.
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APRILD26
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PROFESSIONAL OF RECORD:
L. ALLAN HILL, P.E.
ENGINEER'S CERTIFICATION NOTE OF STORMWATER QUANTITY CONTROL
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The storm water control structure(s) shown on this plan is designed
to reduce the post -development 1 year 24 hour storm event, 2
year 24 hour storm event and the 10 year 24 hour storm event to
pre -development rates.
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PROFESSIONAL OF RECORD:
L. ALLAN HILL, P.E.
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ENGINEER'S CERTIFICATION OF POND AND DAM SAFETY
I, L. Allan Hill, P.E. certify that the stormwater pond and dam shown on this plan satisfies
requirements of the North Carolina State Dam Safety Law of 1967 (As Amended Through 1995)
and the Rules and Regulations as presented in the North Carolina Administrative Code Title 15A, o00000000000000
Subchapter 2K - Dam Safety. In accordance with the requirements in articles GS 143-215.25A and 143-215.26 of �-�N CAiRO`�o°°°
the NC Dam Safety Law and NC Administrative Code 15A NCAC 2K .0200 the Regional Engineer in the Winston-Salem
Regional Office of he NC State's Land Quality Section has been /will be contacted or the determination of whether the o ��°pF E°S°S /O° ?i9 00
proposed dam is governed by or exempt from the Dam Safety Law. I, as the qualified design engineer, certify o oa SEAL �°
that the pond and dam are designed to be safe and adequate for the protection of public a r-o 0
health, safety, welfare, and downstream property. I understand that this certification as the o 15809 0
design engineer shall not relieve the owner or operator of the pond and dam from the legal°° o
duties, obligations, and liabilities arising from such ownership or operation. o 0 G I N�-- �-' � op
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APRILD26
2021
PROFESSIONAL OF RECORD
L. ALLAN HILL, P.E.
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triaddesigngroup
� Architecture I Engineering I Interior Design
Triad Design Group, P.C.
� 4807-C Koger Boulevard
o Greensboro, NC 27407
Telephone [phone]
Facsimile 336-218-8010
www.triad-designgroup.com
NC Architecture Reg. 50709
NC Engineering Lic. C-1108
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