20191297 Ver 1_C5.04 - SCM DETAILS-STORMWATER POND_20191114

STORMWATER PONDCONSTRUCTION SEQUENCE
STORMWATER PONDCONSTRUC'nON NOTES
1. UNDER NO CIRCUMSTANCES SHALL THE STORMWATER PONDBE FINALIZED AND PLANTED PRIOR TO COMPLETION OF
CONSTRUCTION AND STABILIZATION OF ALL AREAS WHICH DRAIN TO IT. 1. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH JOHNSTON COUNTY AND THE STATE OF NORTH CAROLINA STANDARDS AND SPECIFICATIONS.
2. THE CONTRACTOR SHALL WARRANTY ALL PLANTED MATERIALS FOR A PERIOD OF 2 YEARS FROM DATE OF INSTALLATION. AT THE END OF THE
I \ I \ 2. IF PLACEMESTORMWNT
AN PONDIS TO BE USED AS A SEDIMENT BASIN DURING CONSTRUCTION, ROUGH GRADE PER PLANS. FILL FIRST YEAR AND AT THE END OF THE SECOND YEAR, THE CONTRACTOR SHALL REPLACE ALL PLANTS WHICH DO NOT SURVIVE. ANY HEALTHY
� 18 � �( \ \ � � I � PLACEMENT AND OUTLET STRUCTURE CONSTRUCTION SHALL BE IN COMPLIANCE WITH DETAILS AND STORMWATER
O \ I I PONDCONSTRUCTION NOTES HEREON. IF THE STORMWATER PONDHAS BEEN PREVIOUSLY ROUGH GRADED AND/OR USED AS A PLANTS DAMAGED DURING PLANT REPLACEMENT SHALL ALSO BE REPLACED.
\ \�\ 30.08ACsF V I I I I I I I SEDIMENT BASIN, REMOVE AND DISPOSE OF SEDIMENT DEPOSITS WITHIN THE BASIN AREA.
C o MH> �Qi o.oancg I I 1 3. SOILS FOR STORMWATER PONDSHALL BE TESTED BY THE USDA AGRICULTURAL EXTENSION OFFICE FOR pH, WHICH MUST FALL BETWEEN 5.5 AND
\ 4599.40 SFm \ 3. ROUGH GRADE STORMWATER PONDAS NECESSARY AFTER SEDIMENT REMOVAL AND TO FINALIZE BASIN GRADES. ALL FILL 7.0. TESTS SHALL ALSO BE PERFORMED FOR NUTRIENTS SUCH AS NITROGEN, PHOSPHORUS, AND POTASSIUM, AND FOR MINERALS SUCH AS
o.ii Acs r- C \1 3,864.79SF 1 I I I CHELATED IRON AND LIME. AMENDMENTS TO SOIL RECOMMENDED BY USDA SHALL BE INCORPORATED INTO SOIL TO PROMOTE VIGOROUS
- W �s \. 133 I \ PLACEMENT SHALL BE IN COMPLIANCE WITH THE SPECIFICATION IN THE CONSTRUCTION NOTES ON THIS SHEET.
ffl -I r � �(\ \ o.osAcs � e�� � \ VEGETATION AND PLANT GROWTH. RECORDS OF TESTS AND AMENDMENTS PROVIDED BY CONTRACTOR SHALL BE PROVIDED TO THE ENGINEER.
4. AFTER ROUGH GRADING STORMWATER WETLAND, BEGIN FINE GRADING TO CONSTRUCT FOREBAY BERMS/WALLS , SHALLOW
Q�'�1 4. LANDSCAPING PLANTINGS SHOWN HEREON SHALL BE INSTALLED DURING FALL SEASON OR EARLY WINTER IF POSSIBLE FOR MAXIMUM PLANT
32 PLANTING ZONES AND TEMPORARY INUNDATION ZONES. GRADING TOLERANCE FOR THE STORMWATER PONDSHALL BE +/- 0.20
V�\ SURVIVABILITY.
\ 1 s AOQ I \ \ 3,607.50 SF FEET FROM GRADES SHOWN ON THIS PLAN.
I
3579.40 s 7 o.oancs \ \ I \ I I \ 5. IN CONJUNCTION WITH GRADING AND FILL PLACEMENT, CONSTRUCT OUTLET STRUCTURES TO BRING IT INTO COMPLIANCE WITH 5. CONTRACTOR SHALL PAY CLOSE ATTENTION TO PROPER PLACEMENT OF DRAWDOWN PIPE IN RELATIONSHIP TO LITTORAL SHELF. DRAWDOWN PIPE
o.osAcs / I I THESE PLANS. IF OUTLET STRUCTURES WERE CONSTRUCTED WITH ROUGH GRADING WHEN USING THE STORMWATER PONDAS SHALL BE PLACED ACCORDING TO DETAILS TO ALLOW PLANTS AND CALCULATIONS TO PERFORM AS INTENDED.
SEDIMENT BASIN, SKIP TO NEXT STEP.
C \ \ 13 \' � I � \ 6. THE CONTRACTOR OR OWNER SHALL EMPLOY A GEOTECHNICAL ENGINEER TO TEST ALL EMBANKMENTS AND FILL PLACEMENT FOR PROPER
COMPACTION. PROPER COMPACTION SHALL BE PER THE GEOTECHNICAL ENGINEER'S RECOMMENDATIONS OR THESE PLANS WHICHEVER IS MORE
30 \ \ \ \ \ 6. WHEN FINE GRADING AND OUTLET STRUCTURE IS COMPLETE, CALL SURVEYOR AND ENGINEER FOR ASBUILT SURVEY AND STRINGENT. EMBANKMENTS FOR BASINS SHALL BE PLACED IN 6 INCH LOOSE LAYERS AND SHALL BE COMPACTED TO A DENSITY OF NO LESS THAN
3,6@zso sF I VAA EVALUATION. o
� \ oho 95 /a OF THE STANDARD PROCTOR MAXIMUM DENSITY AT A MOISTURE CONTENT OF + OR -TWO PERCENTAGE POINTS OF THE OPTIMUM MOISTURE
\ I \ \\\ \ \\\ CONTENT IN ACCORDANCE WITH ASTM D698. THE CONTRACTOR SHALL TAKE PHOTOGRAPHS OF THE OUTLET STRUCTURE AT ALL PHASES OF
s
\ / 5 \ / I I \\\ \\ \ 1� 7. Y IF SURVEYOR AND ENGINEER DETERMINE THAT GRADING IS NOT IN COMPLIANCE WITH THESE DRAWINGS, MAKE CORRECTIONS
AS REQUIRED BY THE ENGINEER. AND REPEAT PREVIOUS STEP. OTHERWISE PROCEED TO NEXT STEP. INSTALLATION AND SHALL RETAIN WITH GEOTECHNICAL TESTING DATA. THE CONTRACTOR SHALL ALSO RETAIN ALL SHIPPING RECORDS AND
OD 0 ) \ \ \, ! , SPECIFICATIONS FOR THE OUTLET STRUCTURE MATERIALS AND STRUCTURES. ALL OF THE ABOVE DATA MAY BE REQUIRED AS PART OF THE
\ 8. UPON NOTIFICATION FROM THE ENGINEER AND JOHNSTON COUNTY THAT THE STORMWATER PONDIS IN COMPLIANCE WITH MUNICIPALITY AS -BUILT PROCESS AND SHALL BE MADE AVAILABLE TO THE ENGINEER UPON REQUEST. THE CONTRACTOR AND OWNER SHALL
\3,1;W.10 SF 1 THESE DRAWINGS, PROVIDE LANDSCAPING IN COMPLIANCE WITH THE PLAN SHOWN ON THIS SHEET AND ANY ADDITIONAL HAVE DOCUMENTATION OF THESE TESTS AVAILABLE UPON REQUEST.
TAcs SPECIFICATIONS FROM THE OWNER. IF TIMING IS SUCH THAT PLANTINGS WOULD OCCUR IN SUMMER MONTHS, COORDINATE
WITH THE ENGINEER, OWNER, AND THE LOCAL MUNICIPALITY ABOUT DELAYING PLANTINGS UNTIL FALL OR EARLY WINTER FOR 7. TOLERANCES FOR FINAL GRADES SHALL BE WITHIN +/- 0.20 FEET. JOHNSTON COUNTY WILL REQUIRE AN ASBUILT SURVEY OF THE CONSTRUCTED
I I I \ MAXIMUM SURVIVABILITY OF PLANTINGS. STORMWATER PONDTHEREFORE STRICT ADHERENCE TO THE GRADING ON THIS PLAN AND THE TOLERANCES SPECIFIED HEREON SHALL BE
REQUIRED PRIOR TO CERTIFICATION BY THE ENGINEER THAT THE STORMWATER PONDHAS BEEN BUILT IN COMPLIANCE WITH THESE DRAWINGS.
I29 \ I2708 \SEED ALL DISTURBED AREAS, INCLUDING THE DAM, WITH NON CLUMPING GRASS (BERMUDA, CENTIPEDE OR EQUIVALENT). TOP UPON COMPLETION OF THE FINAL GRADING (PRIOR TO PLACEMENT OF ANY PLANT MATERIAL) THE CONTRACTOR SHALL CONTACT THE SURVEYOR
S I 3,60T50SF I I III OF BERM WILL INCLUDE A 10' PAVED WALKING TRAIL WITH 2' SEEDED SHOULDERS ON EACH SIDE. TO SURVEY THE ASBUILT CONSTRUCTED STORMWATER WETLAND. THE CONTRACTOR SHALL NOTIFY THE ENGINEER THAT THE CONSTRUCTED
O o.oancs STORMWATER PONDHAS BEEN COMPLETED AND THE ENGINEER SHALL EVALUATE THE ASBUILT SURVEY DATA FOR COMPLIANCE WITH THESE
V/� I \� \ No 1 1 11 I III 10. CALL JOHNSTON COUNTY STORMWATER INSPECTOR FOR APPROVAL OF STABILIZATION. DRAWINGS. IF THE STORMWATER PONDIS FOUND TO BE OUT OF COMPLIANCE WITH THESE DRAWINGS, THE CONTRACTOR SHALL REGRADE THE
/ l 1�2% � � I III STORMWATER PONDAS NECESSARY TO BRING THE STORMWATER PONDINTO COMPLIANCE WITH THESE DRAWINGS. THE COST OF ANY ADDITIONAL
11. CONTRACTOR SHALL WATER NEW PLANT MATERIAL PLANTED IN THE STORMWATER PONDDAILY UNTIL COMPLETION OF ALL SURVEY OR ENGINEERING EVALUATION REQUIRED RESULTING FROM INCOMPLETE OR INCORRECT GRADING OF THE STORMWATER PONDSHALL BE
0 407.5oSF Q � / I � � I � I OTHER SITE RELATED CONSTRUCTION. AFTER THE FULL SCOPE OF THE CONTRACTOR'S WORK IS COMPLETED, IT SHALL BE THE THE RESPONSIBILITY OF THE CONTRACTOR.
n 10.08
OWNER'S RESPONSIBILITY TO WATER PLANTS DAILY UNTIL PLANTS HAVE BECOME WELL ESTABLISHED AND WATERING IS NO
LONGER NECESSARY.
POND LEGEND
Description
Design
As -Built
A
Elevation Top of Litoral Shelf
270.00 ft
B
Elevation Bottom of Litoral Shelf
269.00 ft
C
Sediment Cleanout Elevation
Forbay
264.00 ft
D
Bottom Elevation Forebay
263.00 ft
E
Top Elevation Forebay Berm
269.00 ft
F
Sediment Cleanout Elevation
Permanent Pool
261.00 ft
G
Bottom Elevation Permanent Pool
260.00 ft
H
Dam Width
14 ft
Top of Dam Elevation
274.00 ft
J
Elevation Secondary Weir
N/A ft
K
Width Secondary Weir
N/A in
L
Top of Riser
271.75 ft
M
Diameter of PVC Drawdown Pipe
6 in
N.
Drawdown Orifice Opening
4.5 in
O
Drawdown Pipe Elevation 1
Permanent Pool
269.50 ft
P
Inside Bottom Riser Elevation
265.00 ft
Q
Outlet Structure Size
6'x6'
R
Ballast Thickness
60 in
S
Size of Outlet Pipe
60 in
T
Length of Outlet Pipe
54 ft
U
Slope of Outlet Pipe
1 %
V
Invert in Outlet Pipe
265.00 ft
W
Invert Out Outlet Pipe
1264.46 ft
Special Instructions
Place Drawdown pipe opposite of outlet pipe and ensure a
minimum of 12" clearance between drawdown pipe opening
and ground elevation to allow for proper drainage. Place
secondary weir above drawdown pipe on same side of outlet
structure.
GRAPHIC SCALE
40 80
( IN FEET)
1 inch = 40 ft.
BOUYANCY CALCULATIONS FOR
RISER/BARREL
Academy Pointe
Town of Clayton
Wet Pond
Riser Dimension 1 (ft):
6.0
Riser Dimension 2 (ft):
6.0
Riser Wall Thickness (in):
6
Pond Bottom Elevation (ft):
265.00
Riser Crest Elevation (ft):
271.75
Density of Riser Matl (lb/cf):
150.00
Pipe Inside Diameter (in):
60
Pipe Wall Thickness (in):
1.5
Length of Pipe Exposed (ft):
11.00
Density H2O (lb/cf):
62.40
Volume H2O Displaced by Riser (cf):
331
Weight H2O Displaced by Riser (lb):
20,639
Volume H2O Displaced by Pipe (cf):
238
Weight H2O Displaced by Pipe (lb):
14,859
Total Uplift Force (lb):
35,498
Weight of Riser (lb):
13,163
Weight of Pipe (lb):
3,321
Pipe/Riser Downward Force (lb):
16,483
Ballast Concrete:
Minimum Factor of Safety:
1.2
Required ballast thickness (in):
58
Provided Ballast Thickness (in):
60
Total Downward Force (lb):
43,483
Provided Factor of Safety:
1.22
Academy Pointe - Town of Clayton - Outlet Protection
Calculations
Outlet #
Q10
(cfs)
V10
(fps)
d50
(in)
Pipe Dia
(in)
Tailwater
dmax
(in)
Thickness
(in)
Length
(ft)
Width
(ft)
Rip Rap
(Class)
Calc.
Method
FES75
63.01
8.52
10
48
Minimum
15
22.5
16
20
B
NCDENR
FES77
52.39
22.51
22.5
60
Minimum
33.75
50.625
33
38
B
NCDENR
OUTLET 51FHUCTUHE DETAIL
NOT TO SCALE
REVISED
11/5/2019 12:15 PM
NOT RELEASED FOR
CONSTRUCTION
SLOPE PROPOSED GREENWAY TRAIL AT A
MAXIMUM SLOPE OF 5% TO PROPOSED
EMERGENCY SPILLWAY ELEVATION (SEE TABLE ON
SHEET C5.04).
LINE OUTSIDE OF BERM WITH RIFFRAFF ALL THE WAY
TO EXISTING GROUND FOR ADDITIONAL
STABILIZATION.
S/ GRgOF 5o'Q GRP�E
10,
EMERGENCY SPILLWAY
I
TRENCH WIDTH
TRENCH
III
-I
WIDTH
GRADE
=111
III
w
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-
-I
III
11- LJ
-III F__
18"
1
-111
ICI-1
°
e a I�
II
O
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O
<4
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n d
11-1
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7"
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a
°
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"
° a 12
a
UTILITY
LINE
d 6"
°
°
(DIAMETER
a
I
ANTI -SEEP
COLLARLd
4
VARIES)
a a a
J
II
°°
IIIIII
-
ANTI -SEEP COLLAR.
-
'I I
CLASS B CONCRETE.
_
SECTION A -A
PLAN VIEW
M
RIN
TYPICAL LOCATION
II I� 9BA PIPES MEETING
/SE PLATE
ANTI SEEP COLLAR
NOT TO SCALE
LOCKABLE
ACCESS HATCH
(2'x4')
STAINLESS STEEL
CABLE CATCH
CROSSING PERPENDICULAR
3/8"0 SCH. 40 (.675"
O.D.) ALUMINUM PIPE
CONSTRUCTION
18"
SECURE TRASH 5x5 CONCRETE
RACK CONCRETE
BOX WITH 1/2"X4" SS BOX
3" x1/4" CHANNEL
ANCHOR-(1)PER CLOSURE PLATE SIDE VIEW
SIDE MIN.
ALUMINUM TRASH RACK MATERIALS AND WELDING
/ PLAN VIEW SPECIFICATIONS
ALUMINUM MATERIALS USED IN TRASH RACK FABRICATION:
PREFABRICATED ALUMINUM HINGE 6061-T6
WELDED TO FRAME (3) HINGES 68„ GENERAL CHARACTERISTICS:
PROVIDED 6061-T6 HEAVY DUTY STRUCTURAL CORROSION RESISTANCE
(B) STRESS, CRACKING (B)
2:1 MIN ALUMINUM MILL PRODUCT SPECIFICATIONS:
3"x1/4" PERIMETER\ 18„ 6061 PIPE MILITARY (MIL-P-25995) ASTM B241) ANSI (H38.7)
SUPPORT PLATE TYPICAL MECHANICAL PROPERTIES:
ANCHOR BOLT TO TOP TENSILE STRENGTH (ksi) 6061-T6 ULTIMATE (45) YIELD (40)
OF STRUCTURE 5.5"X5. "CLEAR OPENING ULTIMATE SHEARING STRENGTH ksi (30)
5x5 CONCRETE TYPICAL MECHANICAL PROPERTIES OF TIG WELDED JOINT ON
BOX ALUMINUM ALLOYS:
SIDE VIEW WELD DUCTILITY BASE METAL 6061 FILLER 5356 ULTIMATE
STRENGTH (29,000#) YIELD STRENGTH (17,000 #)
NOTE: WELDING OF ALUMINUM HAS LITTLE, IF ANY, ROOT PENETRATION INTO BASE METAL. TO ACHIEVE PROPER JOINT ATTACHMENT
BEVELING OF BASE METAL IS NECESSARY AND GENEROUS AMOUNT OF WELD ROD IS REQ'D. WE USE BOTH 4043 AND 5356 FILLER RODS TO
ACHIEVE THE BEST STRENGTH AND CORROSION RESISTANCE FOR THE APPLICATION. ALL PIPES THAT CROSS PERPENDICULAR TO ONE
ANOTHER ARE WELDED TOP AND BOTTOM WITH A 1/4" TO 3/8" WIDE FILLET. PIPES THAT MEET THE BASE PLATES ARE WELDED COMPLETELY
AROUND WITH A 1/4" TO 3/8" WELD FILLET. ALL WELDS ARE DONE IN A MANNER TO ACHIEVE MAXIMUM STRENGTH AND IN AN EFFORT TO MINIMIZE
ANNEALING OF THE BASE METAL IN ORDER TO AVOID CRACKING.
TRASH RACK DETAIL
NOT TO SCALE
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DESIGN
DCA/PCE/EK
DRAWN
ADS/EK
CHECKED
DCA
HORIZONTAL SCALE
SEE GRAPHIC SCALE
VERTICAL SCALE
DATE
05/09/2019
JOB NO.
SHEET
C5.04