SW4200501_C07.05_20200602

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3:,
TEMPORARY FAIRCLOTH SKIMMER
DIAMETER: S
CONNECT FLEXIBLE PIPE
TO POND DRAIN. GATE
VALVE SHALL REMAIN
OPEN. REMOVE SKIMMER
ONCE POND IS NO LONGER
UTILIZED AS TEMPORARY
SEDIMENT BASIN.
O
FLEXIBLE PIPE
PRIMARY SPILLWAY
DIAMETER: Q
L � �TEPS
PVC DRAIN WITH GATE
VALVE AND HAND WHEEL.
ANCHOR TO OUTLET STRUCTURE.
VAVLE TO BE OPEN DURING
CONSTRUCTION.
DIAMETER: R
8" I J
PLAN VIEW
CONCRETE SLAB
MANHOLE RING AND COVER
BARS 8"O.C. E.W.
TOP SLAB ELEV. E
�� 1 8 I
�#4
1 8 11
R
WETLAND OUTLET
,"
. ,. 1
#4 REBAR 4" O.C.
E.W.
.
OPEN -THROAT YARD INLET
I OP4N ON I- I I 1
IN EACH OPENING
z
--4----*Fl9t}4`31@E--4--4-----
I I I I I I 1
3"
RIM ELEV. D
EMBANKMENT
y
PROVIDE TEMPORARY CAP/BLOCKING OR
SLOPE
GROUT AS NECESSARY TO BLOCK OUTLET
CLOW STEM GUIDE
ORIFICES/WEIRS UP TO ELEV- T
SECONDARY SPILLWAY
_
ATTACH TO RISER
OUTLET
INVERT ELEV.: C
WITH THREADED ROD
_
I
FILLED WITH GROUT
BARREL: K
TEMPORARY FAIRCLOTH SKIMMER
/ /
J
I/EMBANKMENT
DIAMETER: S PRIMARY SPILLWAY
PRIMARY SPILLWAY
CONTROL ELEV.: B
CONTROL ELEV.: B
4"PVC SET TOP AT ELEV. • B
- - - - - - --PRIMARY SPILLWAY
+
P
4"PVC ELBOW
INVERT PRIMARY SPILLWAY
ROPE FOR ACCESS TO DRILL OPENING IN END
zoow
ANCHOR
8"
SKIMMER FOR MAINTENANCE CAP. DIAMETER: Q
;
DRAWDOWN
PIPE TO
zoo
I
CONNECT FLEXIBLE PIPE
STRUCTURE
OUTLET
+
TO POND DRAIN. GATE
BARREL: K
VALVE SHALL REMAIN
U-SHAPED STEEL
OPEN. REMOVE SKIMMER
BRACKET ATTACHED
ONCE POND IS NO LONGER EXTEND TO SLOPE
EMBANKMENT
TO BASE WITH THREADED
UTILIZED AS TEMPORARY
ROD FILLED WITH GROUT
SEDIMENT BASIN.
BARREL OUTLET INVERT ELEV.: A 6" DIP
0
`�
F
0 I-
8'x8'
'o
_
D'` �'
BOTTOM PSS= U
I'24
a
•o'. e.•'o' .r,• '
• _
•
DID DRAIN
'
..> •7. . ' ' .> •'
HANDGATE
VE ANDWITH
WHEEL.
WETLAND MAINTENANCE SCHEDULE
DESCRIPTION
METHOD
FREQUENCY
SEASON
DESCRIPTION
METHOD
FREQUENCY
SEASON
EMBANKMENT
PLANTS
INSPECT AND REPAIR
VISUAL
ANNUALLY
ALL
REPLACE ANY DEAD OR
SEE PLANTING
TWICE PER YEAR
MAR 15 - APR 30
EROSION / ANIMAL NESTINGS
DISEASED VEGETATION
SPECIFICATIONS
OCT 1 - NOV 30
CONSIDERED BEYOND
OUTLET STRUCTURE
TREATMENT
DEBRIS / OBSTRUCTIONS
BY HAND
WHENEVER NEEDED
ALL
TREAT ALL DISEASED
MECHANICAL
WHENEVER NEEDED
ALL
PLANTS NOT TO BE REMOVED
OR BY HAND
FOREBAY / DEEP POOL
WATER PLANT MATERIAL
BY HAND
IMMEDIATELY AFTER
N/A
AND END OF EACH DAY
FOR 14 CONSECUTIVE
DAYS AFTER PLANTING
COMPLETION OF
PROJECT
SEDIMENT / DEBRIS
BY HAND
ONCE PER 6 MONTHS OR
WHEN 1/2 FULL OF SEDIMENT
ALL
CONTRACTOR SHALL BE RESPONSIBLE FOR MAINTENANCE UNTIL SUBSTANTIAL COMPLETION
AT WHICH TIME OWNER WILL ASSUME MAINTENANCE RESPONSIBILITY.
REPLACE SUPPORT
STAKES
BY HAND
ONCE PER YEAR
SPRING
REPLACE DEFICIENT
STAKES OR WIRES
BY HAND
WHENEVER NEEDED
ALL
LANDSCAPE WARRANTIES SHALL APPLY TO STORMWATER WETLAND PLANTINGS.
TOP SHALLOW LAND: X I ►j
I I PERMANENT POOL TOP INTERIOR EMBANKMENT V 3
ELEV. B WEIR ELEV W
1
Z,1.7
FOREBAY k\x-- FOREBAYBOTTOM= YIR SECTION
FOREBAY BOTTOM AT ENTRANCE/SEDIMENT --J
STORAGE TOP = 809.50
EXCAVATE SEDIMENT STORAGE TO ELEV. = 809.00
FOREBAY BOTTOM AT EXIT/SEDIMENT STORAGE TOP
= 810.00
EXCAVATE SEDIMENT STORAGE TO ELEV. = 809.50
3
1�
WETLAND CONSTRUCTION SEQUENCE
STONE ON FILTER FABRIC
EMERGENCY SPILLWAY SECTION
SCALE: N.T.S.
INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 6:1
12'
TOP OF EMBANKMENT ELEV.: G
LENGTH 2/3 LENGTH
EMER. SPILLWAY I CREST ELEV.: F \ i
=1 11LA 1 6 I I I=1 11 1 I I I
EMERGENCY SPILLWAY I111111111 3
CUT INTO EXISTING SLOPE I1-1I1-1---------------- o 0�1
EMBANKMENT SECTION AT EMERGENCY SPILLWAY
SCALE: N.T.S.
1. IF NATIVE TOPSOIL ON SITE IS TO BE UTILIZED, A SOIL ANALYSIS SHOULD BE CONDUCTED TO DETERMINE THE VIABILITY OF SOILS FOR HEALTHY VEGETATION
GROWTH. IMPORTED OR IN -SITU SOILS MAY BE AMENDED WITH ORGANIC MATERIAL, DEPENDING ON SOIL ANALYSIS TO ENHANCE THE SUITABILITY AS PLANTING
MEDIA. CONTRACTOR SHALL SUBMIT RESULTS OF SOIL ANALYSIS TO LANDSCAPE ARCHITECT FOR APPROVAL PRIOR TO CONSTRUCTION.
2. THE STORMWATER WETLAND SHALL BE UTILIZED AS A TEMPORARY SEDIMENT BASIN DURING CONSTRUCTION.
2.1. SCHEDULE THE FOLLOWING WORK TO COINCIDE WITH AN EXTENDED FORECAST OF NO PRECIPITATION SUCH THAT ALL WORK CAN BE COMPLETED DURING A
PERIOD OF DRY WEATHER. INSTALL COFFER DAM UPSTREAM OF POND IN CASE OF ANY UNEXPECTED PRECIPITATION EVENT. UTILIZE MUD PUMP WITH
FLOATING SUCTION INLET THROUGH A SEDIMENT FILTER BAG LOCATED DOWNSTREAM OF BASIN.
2.2. INSTALL WETLAND BARREL, OUTLET STRUCTURE, EMBANKMENT, EMERGENCY SPILLWAY AND OTHER WETLAND COMPONENTS.
2.3. CALL FOR SITE INSPECTION PRIOR TO BACKFILLING WETLAND BARREL.
2.4. INSTALL TEMPORARY SKIMMER ON WETLAND DRAIN. DRAIN VALVE TO REMAIN OPEN.
2.5. EXCAVATE WETLAND TO TEMPORARY SKIMMER BASIN DIMENSIONS, SEE EROSION CONTROL PLAN.
2.6. INSTALL BAFFLES AND OTHER TEMPORARY SKIMMER BASIN COMPONENTS, SEE TEMPORARY SKIMMER BASIN DETAIL.
2.7. SEED ALL DISTURBED AREAS.
3. FOLLOWING COMPLETION OF CONSTRUCTION AND STABILIZATION OF POND DRAINAGE BASIN, PERFORM THE FOLLOWING:
3.1. SCHEDULE THE FOLLOWING WORK TO COINCIDE WITH AN EXTENDED FORECAST OF NO PRECIPITATION SUCH THAT ALL WORK CAN BE COMPLETED DURING A
PERIOD OF DRY WEATHER. INSTALL COFFER DAM UPSTREAM OF POND IN CASE OF ANY UNEXPECTED PRECIPITATION EVENT. UTILIZE MUD PUMP WITH
FLOATING SUCTION INLET THROUGH A SEDIMENT FILTER BAG LOCATED DOWNSTREAM OF BASIN.
3.2. REMOVE TEMPORARY BAFFLES.
3.3. REMOVE ALL ACCUMULATED SEDIMENT. GRADE WETLAND INTERIOR TO SUBGRADE ELEVATIONS.
3.4. INSTALL CLAY LINER AND ARMORED SECTIONS OF FOREBAY WEIRS.
3.5. IF ADDITIONAL DE -WATERING IS NEEDED BELOW DRAIN/SKIMMER ELEVATION, UTILIZE A MUD PUMP WITH FLOATING SUCTION INLET AND DISCHARGE
REMAINING WATER THROUGH A SEDIMENT FILTER BAG LOCATED OUTSIDE OF THE BASIN. MONITOR PUMPING TO ENSURE FLOW DOES NOT EXCEED THE
CAPACITY OF FILTER BAG.
3.6. INSTALL AND FINE GRADE TOPSOIL TO FINISH GRADES. IF SOIL AMENDMENTS ARE REQUIRED PER THE SOIL ANALYSIS, THE SOIL IS TO BE AMENDED TO A
DEPTH OF 12" PER THE STATE REQUIREMENTS.
3.7. INSTALL TEMPORARY SLOPE LININGS.
3.8. REMOVE TEMPORARY CAP/BLOCKING FROM PRIMARY SPILLWAY.
3.9. INSTALL WETLAND PLANTINGS.
3.9. FOLLOWING APPROVAL OF SURVEY, REMOVE TEMPORARY SKIMMER AND CLOSE DRAIN VALVE.
3.10. FILL POND AND MONITOR WATER SURFACE ELEVATION FOR 48 HOURS. WATER SURFACE SHALL REMAIN WITHIN ONE INCH OF PERMANENT POOL
ELEVATION. IF WATER LEVEL DROPS ONE INCH, NOTIFY ARCHITECT AND INVESTIGATE OUTLET BARREL, OUTLET STRUCTURE AND EMBANKMENT FOR LEAKS
OR DEFECTS. MAKE REPAIRS IF REQUIRED AND FILL POND AND REPEAT WATER ELEVATION MONITORING. IF WATER LEVEL REMAINS WITHIN TOLERANCE,
NOTIFY ARCHITECT AND PERFORM DETAILED TOPOGRAPHIC SURVEY.
12" TOPSOIL LAYER
UNDER ALL WATER
SURFACES ABOVE
CLAY LINER
EXCAVATE 18" DEEP PIT BELOW
SKIMMER AND PROVIDE 8'x24"xl8" #57
WASHED STONE PAD TO KEEP SKIMMER
FROM SETTLING IN MUD
ANCHOR TO OUTLET STRUCTURE.
VAVLE TO BE OPEN DURING OUTLET STRUCTURE
CONSTRUCTION. SECTION Y-Y
DIAMETER: R
FLANGED, NRS, RESILIENT WEDGE GATE -
VALVE WITH EXTENSION STEM, HAND
WHEEL AND STEM GUIDES AS
MANUFACTURED BY CLOW OR APPROVED
EQUAL.
TOP OF EMBANKMENT ELEV.: G
4' MIN. I TEMPORARY POOL/SHALLOW LAND TOP ELEV.
ELEV. • X
8' IMPERVIOUS CLAY
LINER UNDER ALL WATER
SURFACES
MAX. INFILTRATION RATE
0.01 INAR
18" THICK CLASS 'A'
STONE ON FILTER FABRIC
3
P
4'
TOE OF SLOPE
UUILLI JIKUGIUKL NUILJ:
EMER. SPILLWAY CREST ELEV.: F
OUTLET STRUCTURE
PROVIDE TEMPORARY CAP/BLOCKING OR
GROUT AS NECESSARY TO BLOCK OUTLET
ORIFICES/WEIRS UP TO ELEV- T
TOP SLAB ELEV. E �I 18 I
WETLAND OUTLET
OPEN -THROAT YARD INLET
z
RIM ELEV: D
SECONDARY SPILLWAY
INVERT ELEV.: C
PRIMARY SPILLWAY
CONTROL ELEV.: B
PRIMARY SPILLWAY Cc
INVERT
BARREL OUTLET INVERT ELEV.: A
CONCRETE SLAB
MANHOLE RING AND COVER
�#4 BARS 8"O.C. E.W.
8R
#4 REBAR 4" O.C. E.W.
11 1 I fL OP N ON'- I I I I IN EACH OPENING
--W-+ +FOUR SIDES- -+--H-+-- 3"
II 1 I 1 1 1 1 I 1 1
ANCHOR REBAR
M TO STRUCTURE
RED BLOCK
MASONRY STRUCTURE
\ DOWELS SHALL BE #4
BARS @ 12" CENTERS
yl 0 0 I�
6"
#5 BARS, 12" O.C.E. w. OUTLET STRUCTURE
SECTION X-X
TEMPORARY SEDIMENT BASIN NOTES:
1. INSPECT DEVICE AFTER EACH RAINFALL. REMOVE SEDIMENT WHEN SEDIMENT
REACHES A DEPTH OF NO MORE THAN ONE-HALF THE HEIGHT OF THE RISER.
REPAIR BAFFLES IF DAMAGED.
2. PULL SKIMMER TO SIDE OF BASIN WITH ROPE AND INSPECT REGULARLY. KEEP
SKIMMER HEAD, ORIFICE AND PIPE FREE OF DEBRIS. REMOVE SEDIMENT FROM
BENEATH SKIMMER AND ENUSRE VEGETATION DOES NOT INTERFERE WITH SKIMMER
OPERATION.
J. PROVIDE PAINT MARK ON RISER AT 12" HEIGHT. CLEAN AND REPAIR ONCE
SEDIMENT REACHES MARK.
4. INSTALL ALL COMPONENTS OF POND EMBANKMENT, OUTLET STRUCTURE, SKIMMER,
EMERGENCY SPILLWAY, ETC. (UNLESS NOTED) PRIOR TO BEGINING CLEARING
OPERATIONS.
5. SEE SHEET CO7.03 FOR TEMPORARY BAFFLE INSTALLATION.
INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 6:1 I 10' EMERGENCY SPILLWAY
AND FLOOR OF POND
-I 11=1 I I=1 11=1 11=1 I I -I 11=1 11=1 I I -III -III-
OUTLET SEED & MULCH EMBANKMENT
-III=ITi="'
-11=_III-" SEE SEEDING SCHEDULE INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 6:1
OUTLET STRUCTURE 3
=
SEE DETAIL THIS i�
#57 WASHED STONE
1 1-III
= _ 1
=III„I I II
PERMANENT POOL
SHEET.
/
FILTER DIAPHRAGM
CHIMNEY
-III =
=1I1-1I1=
"�=III„I11111-
HEADWALL/FES
SEE GRADING PLAN
ELEV. B
L
T
BARREL OUTLET INV
COMPACTED
IMPERVIOUS FILL
INSTALL 2-FT
FROM PIPE JOINT
ELEV.: A
U
DEEP POOL
3 - ---------------------------------------------------------------
----- ------------------------------------------
RCP WITH RUBBER GASKET (ASTM C-
443) OUTLET BARREL: K
OUTLET I
DEEP POOL
BOTTOM= U
:.- - - - - - - - - - - -
r..y ,. .. i..
-----------------------------------
-------
--- ----------------------------------------------
ELEV.: H
V.: H -
1
NOTE
CRADLE
(PLOWABLE FILL)
1 L
1
U
#57 WASHED STONE
EMBANKMENT SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL, FREE OF ROOTS,
SEE DETAIL THIS SHEET
1
1
FILTER DIAPHRAGM SEE DETAIL THIS SHEET
VEGETATION, ROCKS & OTHER OBJECTIONABLE MATERIAL. SCARIFY SURFACES BEFORE
I
4 I
T
Y
PLACING FILL. PLACE FILL IN 6-8 INCH LOOSE LIFTS. COMPACT TO AT LEAST 957 OF THE
I
I
STANDARD PROCTOR DENSITY.
OUTLET PROTECTION
1. ALL STRUCTURES OVER Y-6" IN DEPTH TO BE PROVIDED WITH STEPS 1'-2"
ON CENTERS. STEPS SHALL BE IN ACCORDANCE WITH STANDARD 840.66.
2. LOCATE MANHOLE OVER STEPS.
3. CLASS "A" (3,000 PSI) CONCRETE TO BE USED.
4. ALL MOTOR JOINTS ARE 1/2" f 1/8".
5. GROUT SHALL BE NON -SHRINK (ASTM-C1107)
6. CONCRETE BLOCK SHALL MEET NCDOT SPECIFICATIONS SECTION 1040-2.
7. BLOCK SHALL BE RED IN COLOR AND SUBSTANTIALLY FREE FROM CHIPS
AND CRACKS
AS -BUILT SURVEY REQUIREMENTS
NOTE: CONTRACTOR SHALL PROVIDE AS -BUILT TOPOGRAPHIC SURVEY PERFORMED
BY A PROFESSIONAL LAND SURVEYOR CERTIFYING WETLAND AREA DIMENSIONS
AND ELEVATIONS OF THE FOLLOWING:
1. OUTLET STRUCTURE TOPS AND INVERTS, ORIFICE/WEIR DIAMETERS, BARREL
PIPE SIZES AND INVERTS AND STRUCTURE HEIGHT & WIDTH DIMENSIONS.
2. EMERGENCY SPILLWAY ELEVATION AND DIMENSIONS.
J. TOPOGRAPHY THAT EXTENDS 20 FEET OUTSIDE LIMITS OF POND WATER
SURFACE AND EMBANKMENT.
4. CONTRACTOR PROVIDE TEST RESULTS OF CLAY LINER.
5. CONTRACTOR TO PROVIDE PHOTOS OF INSTALLATION OF BARREL, OUTLET
STRUCTURE AND EMBANKMENT.
2-FT DEEP CUT OFF TRENCH.
EXCAVATE TRENCH ALONG CENTERLINE
OF EMBANKMENT AND EXTEND INTO BOTH
ABUTMENTS TO AT LEAST THE ELEVATION
OF THE RISER CREST.
INSTALL SLOPE PROTECTION MATTING
ON ALL SLOPES STEEPER THAN 6:1
6'
TOP INTERIOR EMBANKMENT • V
IMPERVIOUS LAYER TO BE INSTALLED UNDER ALL WATER SURFACES. IMPERVIOUS LAYER
TO CONSIST OF CLAYEY OR SILTY SOIL MIXTURES CAPABLE OF COMPACTING TO A DENSE
STATE WITH AN MAXIMUM PERMEABILITY OF 0.01 IN/HR COMPACTED TO AT LEAST 987. OF
THE MAXIMUM DRY DENSITY PER ASTM D-698. ASTM D 2487 SOIL CLASSIFICATION
GROUPS CH, CL, SC, MH, AND ML; FREE OF ROCK, BRUSH, ROOTS, AND OTHER ORGANIC
MATERIAL SUBJECT TO DECOMPOSITION.
POND AND EMBANKMENT SECTION
STONE ON FILTER FABRIC
FOREBAY WEIR SECTION
WETLAND SCHEDULE
SCM NUMBER
SCM 2
DESCRIPTION
SCM NUMBER
SCM 2
DESCRIPTION
A (FT)
809.50
BARREL OUTLET ELEVATION
Q (IN)
3/4
PRIMARY SPILLWAY ORIFICE
B (FT)
812.00
PRIMARY SPILLWAY CONTROL ELEVATION
R (IN)
4
DRAIN VALVE DIAMETER
C (FT)
813.00
SECONDARY SPILLWAY ELEVATION
S (IN)
1-1/2 & 5/8
SKIMMER DIAMETER & ORIFICE DIAMETER
D (FT)
814.00
RIM ELEVATION
T (FT)
813.50
TEMPORARY SEDIMENT STORAGE ELEVA71ON
E (FT)
815.50
TOP SLAB ELEVATION
U (FT)
810.00
DEEP POOL BOTTOM
F (FT)
815.00
EMERGENCY SPILLWAY CREST ELEVATION
V (FT)
812.50
TOP INTERIOR EMBANKMENT
G (FT)
816.00
TOP OF EMBANKMENT ELEVATION
W (FT)
811.25
SHALLOW WATER BOTTOM ELEV.
H (FT)
808.00
INVERT OUT OF BARREL
X (FT)
812.70
TEMPORARY POOL/SHALLOW LAND TOP ELEV.
1 (FT)
3
OUTLET STRUCTURE INTERIOR WIDTH
Y (FT)
SEE PONDES SECTION
FOREBAY BOTTOM
J (FT)
3
OUTLET STRUCTURE INTERIOR LENGTH
1-YR STORM ELEV.
813.03'
K
54 LF 15"RCP
OUTLET BARREL
2-YR STORM ELEV.
813.13'
L (FT)
8
EMERGENCY SPILLWAY WIDTH
10-YR STORM ELEV.
813.78'
M (IN)
12
SECONDARY SPILLWAY WIDTH
100-YR STORM ELEV.
814.39'
N (IN)
12
THROAT OPENING HEIGHT
0 (IN)
6
CONCRETE BASE EXTENSION WIDTH
SHWT ELEV.
N/A
SEASONAL HIGH WATER TABLE ELEVATION
P (IN)
6
CONCRETE BASE EXTENSION THICKNESS
CLAY LINER
YES
CLAY LINER REQUIRED
SHALLOW WATER
#57 WASHED
STONE WRAPPEL
IN FILTER FABRI
I' 24" �l
r
SEE GRADING PLAN.
BARREL
12" MIN. _ I 1f
z
CRADLE
(FLOWABLE FILL)
can
z
�v
SECTION S-S
#57 WASHED
STONE WRAPPED
IN FILTER FABRI(
SECTION U-U
CRADLE (PLOWABLE FILL)
EXTEND TO
DOWNSTREAM
EDGE OF
EMBANKMENT
FILTER DIAPHRAGM
SPRING LINE
SECTION T- T
#57 WASHED
STONE WRAPPED
IN FILTER FABRIC
Piedmont Leaf Lofts
404 East 4th Street,
Winston-Salem, NC 27101
Phone [phone] Fax [phone]
www.mckissickassociates.com
Consultants:
Consultant Name Civil/Structural/MEP
Seal:
CLH DESIGN, P.A.
400 Regency Forest Drive
Suite 120
Cary, North Carolina 27518
Phone: [phone]
Fax: [phone]
LA: C-106, PE: C-1595
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ISSUE LOG
Distribution Date No.
REVIEW COMMENTS
11/8/19
1
NCDEQ COMMENTS
1 /30/20
5th NCDEQ REVIEW
05/28/20
6th NCDEQ REVIEW
1 06/02/20
0
Client:
WINSTON-SALEM FORSYTH
COUNTY SCHOOLS
LEWISVILLE MIDDLE
SCHOOL
Drawing Title:
SITE DETAILS
Bid Documents
Issue Date
NOVEMBER 8, 2019
Project Number: Drawn by:
201 7-8 RP/I<L
Drawing Number
C07005
o�
SCM 2 WETLAND/TEMPORARY SEDIMENT BASIN N.TS