SW5220302_Plansheet C5.7 - SCM Detail_20220406

SOD INSIDE BANKS AND BOTTOM
1
1
�1
100-YR STORM ELEV=427.73
10-YR STORM ELEV=427.69 PVC CLEANOUT 2' ABOVE
PLANTING SURFACE WITH
2-YR STORM ELEV=427.64 GLUED FITTINGS AND RIM ELEV: 427.22'
1-YR STORM ELEV=427.49 SCREW CAP (TYP.)
----------------- --- TOP OF SOD ELEV: 425.62'
OUTLET STRUCTURE
BIORETENTION
~ PLANTING SOIL
SEED & MULCH EMBANKMENT SEE SEEDING SCHEDULE
(INSTALL SLOPE PROTECTION MATTING ON ALL SLOPES
STEEPER THAN 6: 1)
10'
TOP OF EMBANKMENT ELEV: 429.20'
SOD INSIDE BANKS AND BOTTOM\ - �I III-"' SPILLWAY WEIR: 428.00'
' 1
3 / =ICI ICI =- PROPOSED MANHOLE
d C2 (SEE SHEET C4.0)
a
99'
°
8
°
°
d
d
d
°
° a °d d
/ d \
ANCHOR d
DRAWDOWN \
/ PIPE TO WALL ° ° d \
d d
/ 12"
6"PVC °° ° \\
° e I
' d
6" PVC
UNDERDRAIN 6" PVC END CAP
I INV=421.99 °
6" PVC TEE
WATERTIGHT ° d
NON -SHRINK ° ° ° d d
GROUT ° ° Ad d /
\ a °° a d
d ° e ° a /
° d° d e
/
\
\ \ UNDERDRAIN ELBOW
\ ENLARGEMENT
\
\
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RIM ELEV.: 427.22
PLAN VIEW
\ -11 C
° IMPERVIOUS SEFFILL / IMPEORVIO US
d N 7
1
- - - - - - - - - - - - - - - - - - - -
---------------------------
BARREL OUTLET 49 LF OF 18" RCP WITH RUBBER GASKET (ASTM C-443)
INV ELEV.: 421.99'
- - - - - - - - - - - - - - - - - - - - - - -4 -
I INV IN=419.90
NOTE \LL
/
EMBANKMENT SHALL BE CONSTRUCTED OF CLEAN STRUCTURAL SOIL, FREE OF
ONE CONC. ANTI -SEEP COLLAR (6" WIDE)
ROOTS, VEGETATION, ROCKS & OTHER OBJECTIONABLE MATERIAL. SCARIFY \ UNDER CENTER OF EMBANKMENT
SURFACES BEFORE PLACING FILL. PLACE FILL IN 6-8 INCH LOOSE LIFTS.
COMPACT TO AT LEAST 95% OF THE STANDARD PROCTOR DENSITY.
BIORETENTION BASIN CONSTRUCTION SHALL BE UNDER THE SUPERVISION OF , • • • z \
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THE OWNERS GEOTECHNICAL CONSULTANT. / ; •• • \
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BIO-RETENTION AND EMBANKMENT SECTION
°
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SCALE: N.T.S.
•1 • •••
24"
RCP • d
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Al
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ANTI -SEEP COLLAR
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ENLARGEMENT
/
WELDED ALUMINUM BAR GRATING
3" x 3" OPENINGS
PEAKED ROOF TRASH RACK
A: MATERIAL: ALUMINUM WITH 25
YEAR DESIGN LIFE
° I 4'-0" e
(6) 1/2" X 4"
d ° STAINLESS STEEL
d BOLTS PER SIDE (TYP).
UPTURNED ELBOW SOD ELEV.: 425.62
ON 6" UNDERDRAIN
d I_ PIPE (4) 5" MIN. WALL (TYP)
° / d
d
a \ e
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°
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O/ • UNDERDRAINS
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Al ° d
ADDITIONAL CLASS B
CONCRETE IN BOTTOM OF
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SECTION X-X
DAM EMBANKMENT CONSTRUCTION STANDARDS
1. CONTROLLED FILL, AS SPECIFIED BY THE GEOTECHNICAL ENGINEER, IN THE DAM EMBANKMENT SHALL BE PLACED IN 6-INCH LOOSE LAYERS (3-INCH LOOSE LAYERS
WITHIN 3-FEET OF EITHER SIDE OF THE PRINCIPAL SPILLWAY PIPE TO A DEPTH OF 2-FEET OVER THE PIPE) AND SHALL BE COMPACTED TO A DENSITY OF NO LESS
THAN 95% OF THE STANDARD PROCTOR MAXIMUM DENSITY AT A MOISTURE CONTENT OF + OR - TWO PERCENTAGE POINTS OF THE OPTIMUM MOISTURE CONTENT IN
ACCORDANCE WITH ASTM D698.
2. ALL VISIBLE ORGANIC DEBRIS SUCH AS ROOTS AND LIMBS SHALL BE REMOVED FROM THE FILL MATERIAL PRIOR TO COMPACTION TO THE REQUIRED DENSITY. SOILS
WITH ORGANIC MATTER CONTENT EXCEEDING 5% BY WEIGHT SHALL NOT BE USED. STONES GREATER THAN 3-INCH (IN ANY DIRECTION) SHALL BE REMOVED FROM
THE FILL PRIOR TO COMPACTION.
3. FILL MATERIAL PLACED AT DENSITIES LOWER THAN SPECIFIED MINIMUM DENSITIES OR AT MOISTURE CONTENTS OUTSIDE THE SPECIFIED RANGES OR OTHERWISE
NOT CONFORMING TO SPECIFIED REQUIREMENTS SHALL BE REMOVED AND REPLACED WITH ACCEPTABLE MATERIALS.
4. ANY FILL LAYER THAT IS SMOOTH DRUM ROLLED TO REDUCE MOISTURE PENETRATION DURING A STORM EVENT SHALL BE PROPERLY SCARIFIED PRIOR TO THE
PLACEMENT OF THE NEXT SOIL LIFT.
5. SURFACE WATER AND STREAM FLOW SHALL BE CONTINUOUSLY CONTROLLED THROUGHOUT CONSTRUCTION AND THE PLACEMENT OF CONTROLLED FILL.
6. FOUNDATION AREAS MAY REQUIRE UNDERCUTTING OF COMPRESSIBLE AND/OR UNSUITABLE SOILS IN ADDITION TO THAT INDICATED ON THE PLANS. ALL SUCH
UNDERCUTTING SHALL BE PERFORMED AT THE DISCRETION OF THE GEOTECHNICAL ENGINEER AND SHALL BE MONITORED AND DOCUMENTED. IN NO CASE SHALL
THERE BE AN ATTEMPT TO STABILIZE ANY PORTIONS OF THE FOUNDATION SOILS WITH CRUSHED STONE.
7. TREATMENT OF SEEPAGE AREAS, SUBGRADE PREPARATION, FOUNDATION DEWATERING AND ROCK FOUNDATION PREPARATION (I.E., TREATMENT WITH SLUSH
GROUTING, DENTAL CONCRETE, ETC.) MAY BE REQUIRED AT THE DISCRETION OF THE GEOTECHNICAL ENGINEER. ALL SUCH ACTIVITIES SHALL BE CLOSELY
MONITORED AND DOCUMENTED BY THE GEOTECHNICAL ENGINEER.
8. FILL ADJACENT TO THE RISER AND PRINCIPAL SPILLWAY PIPE SHALL BE PLACED SO THAT LIFTS ARE AT THE SAME LEVEL ON BOTH SIDES OF THE STRUCTURES.
9. EARTHWORK COMPACTION WITHIN 3-FEET OF ANY STRUCTURES SHALL BE ACCOMPLISHED BY MEANS OF HAND TAMPERS, MANUALLY DIRECTED POWER TAMPERS OR
PLATE COMPACTORS OR MINIATURE SELF-PROPELLED ROLLERS.
10. COMPACTION BY MEANS OF DROP WEIGHTS FROM A CRANE OR HOIST SHALL NOT BE PERMITTED.
11. HEAVY EQUIPMENT SHALL NOT BE ALLOWED TO PASS OVER CAST -IN -PLACE STRUCTURES (INCLUDING THE CRADLE) UNTIL ADEQUATE CURING TIME HAS ELAPSED.
12. TO RE-ESTABLISH VEGETATION AFTER CONSTRUCTION, A 2- TO 3-INCH LAYER OF TOPSOIL SHALL BE PLACED ON THE DISTURBED EMBANKMENT SURFACE AND THE
AREA SEEDED AND MULCHED OR HYDROSEEDED.
TESTING, OBSERVATION, AND CERTIFICATION
1. TESTS OF THE DEGREE (%) OF COMPACTION OF THE PLACED FILL IN THE DAM SHALL BE PERFORMED AS A PART OF THE PERMITTEE'S NORMAL QUALITY CONTROL
PROGRAM FOR THE CONSTRUCTION OF THE DAM. TESTS SHALL BE CONDUCTED CONCURRENT WITH THE INSTALLATION OF THE COMPACTED FILL AND THE
CONTRACTOR SHALL COORDINATE THE CONSTRUCTION OF THE DAM SO THAT THE TESTING CAN BE COMPLETED. SHOULD THE RESULTS OF THE TESTS INDICATE THAT
THE SPECIFIED DEGREE OF COMPACTION HAS NOT BEEN OBTAINED; THE PORTIONS OF THE DAM REPRESENTED BY SUCH TESTS SHALL BE REWORKED OR REBUILT.
ALL PORTIONS OF THE DAM SHALL ACHIEVE THE SPECIFIED MINIMUM DEGREE OF COMPACTION.
2. CONSTRUCTION OF CLASS A, B AND C DAM EMBANKMENTS SHALL BE DONE UNDER THE OBSERVATION OF A QUALIFIED GEOTECHNICAL ENGINEER, WHO IS
REGISTERED AS A PROFESSIONAL ENGINEER IN THE STATE OF NORTH CAROLINA. THE GEOTECHNICAL ENGINEER MUST HAVE EXPERIENCE IN THE DESIGN AND
CONSTRUCTION MONITORING OF DAMS OF THE SIZE AND SCOPE COVERED BY THESE STANDARDS AND GUIDELINES.
3. ON CLASS A, B, AND C DAMS (WITH THE EXCEPTION OF DETENTION ONLY CLASS C DAMS THAT COLLECT DRAINAGE FROM AN AREA OF 25-ACRES OR LESS), THE
GEOTECHNICAL ENGINEER, AS DEFINED ABOVE, SHALL OBSERVE ALL ASPECTS OF THE CONSTRUCTION OF THE DAM (I.E., PREPARATION OF THE FOUNDATION,
INSTALLATION OF THE CUT-OFF TRENCH, INSTALLATION OF THE PRINCIPAL SPILLWAY PIPE, INSTALLATION OF THE INTERNAL DRAINAGE, INSTALLATION OF
COMPACTED FILL, ETC.). THE FREQUENCY OF OBSERVATION AND TESTING MUST BE SUFFICIENT FOR THE GEOTECHNICAL ENGINEER (OR THE DESIGN ENGINEER ON
CLASS D DAMS AND CLASS C, DETENTION ONLY, DAMS) TO STATE, IN HIS/HER PROFESSIONAL OPINION, THAT THE SPECIFIC ITEMS OBSERVED AND TESTED WERE
INSTALLED IN ACCORDANCE WITH THE APPROVED CONSTRUCTION DRAWINGS AND SPECIFICATIONS. REFERENCE IS MADE TO THE CITY OF DURHAM 'REFERENCE
GUIDE FOR DEVELOPMENT" SECTIONS 4.1 TO 4.5 REGARDING GEOTECHNICAL CERTIFICATION OF DAM EMBANKMENTS.
OUTLET STRUCTURE
SCALE: N.T.S.
30" x 24" LOCKABLE ACCESS
HATCH WITH HINGES
4'-10"
WELDED ALUMINUM BAR GRATING
3" x 3" OPENINGS
PEAKED ROOF TRASH RACK
MATERIAL: ALUMINUM WITH 25
N YEAR DESIGN LIFE
❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑❑ 3" x 3" OPENINGS
O co
° O ° O 1/2" STEEL PLATE
co d Od
(6) 1/2" X 4" EMBANKMENT
STAINLESS STEEL 4 0 a SLOPE
BOLTS PER SIDE (TYP). d
° d
SOD ELEV.: 425.62 d r 5" MIN. WALL (TYP)
EMBANKMENT
d °
a
d
° ° a
6" UNDERDRAIN INV. ELEV.:421.99 • OUTLET BARREL
18" RCP PIPE INV.
BOTTOM OF MEDIA ELEV.: 421.99
ELEVATION = 421.99. 11 11 I I d ° d III II IL IL II II II _
d °
II�I-
11=11 �
COMPACTED A ° °d d
SUBGRADE ° ° "' ° ° d d ° ° d
(SEE SPECS) °
BIO-RETENTION AREA CONSTRUCTION SEQUENCE
FOLLOWING FULL STABILIZATION OF THE SITE AND APPROVAL BY NCDENR INSPECTOR AND
THE SITE ENGINEER, CONVERT SEDIMENT BASINS AND TRAPS TO FINAL BIO-RETENTION
AREAS AS FOLLOWS:
1. ENSURE ENTIRE PERIMETER OF BIO-RETENTION AREA IS STABILIZED WITH A HEALTHY
STAND OF VEGETATION.
2. REMOVE ACCUMULATED SEDIMENT AND EXCAVATE TO SUB DRAIN ELEVATIONS,
DISPOSE OF EXCAVATED MATERIALS AND SEDIMENT OFF -SITE.
3. FINE GRADE INTERIOR OF DEVICE.
4. REPAIR ANY DAMAGED VEGETATED PERIMETER AREAS WITH SOD OR RE -SEED AND
COVER WITH EXCELSIOR SLOPE PROTECTION MATTING. INSTALL SILT FENCE AS NEEDED
TO KEEP ANY SEDIMENT FROM DRAINING INTO EXCAVATION.
5. INSTALL SUBDRAIN PIPING WASHED STONE DRAINAGE LAYER AND FILTER FABRIC.
DO NOT LEAVE STONE EXPOSED WITHOUT FILTER FABRIC COVER.
6. REMOVE FAIRCLOTH SKIMMER AND PATCH HOLE.
7. PLACE PLANTING SOIL MIX IN DEEP, UNCOMPACTED LIFTS STARTING AT FAR END OF
CELL TO AVOID PLACING EARTH MOVING EQUIPMENT ON PLACED SOIL. NO HEAVY
EQUIPMENT SHALL BE ALLOWED ONTO THE PLANTING SOIL.
8. INSTALL RIPRAP ENERGY DISSIPATERS WITHOUT PLACING HEAVY EQUIPMENT ON
PLANTING SOIL BED.
9. FINE GRADE SURFACE PLANTING SOIL BED BY HAND.
10. INSTALL ALL PLANT MATERIAL BY HAND.
11. REPAIR ALL REMAINING DISTURBED AREAS WITH SOD OR RE -SEED AND COVER
WITH SLOPE PROTECTION MATTING.
12. PERFORM GRASS MAINTENANCE UNTIL FULL COVERAGE IS OBTAINED.
13. REMOVE PERIMETER SILT FENCE AND STABILIZE RESULTING DISTURBED AREAS.
14. SILT FENCE BELOW TRAPS AND BASINS SHALL REMAIN IN PLACE UNTIL CONVERSION TO
PERMANENT FACILITIES AND FINAL STABILIZATION ARE COMPLETE.
SECTION Y-Y
PROVIDE AS -BUILT SURVEY, REQUIREMENTS ARE LISTED BELOW:
CONTRACTOR SHALL PROVIDE SIGNED, SEALED AND DATED AS -BUILT
SURVEY PLANS PERFORMED BY A PROFESSIONAL LAND SURVEYOR THAT
INCLUDES THE FOLLOWING:
• BIO-RETENTION AREA DIMENSIONS
• AREA OF BERMUDA SOD
• ELEVATIONS
• SIDE SLOPES
• BENCHMARK FOR CLEANOUT
• INLET DEVICES AND ENERGY DISSIPATERS
• OUTLET STRUCTURE INVERTS
• ORIFICE DIAMETER
• PIPE SIZES
• CLEANOUT LOCATIONS AND ELEVATIONS
• PLAN AND CROSS-SECTION VIEW AT A SCALE OF 1"=30' OR LARGER
• CROSS SECTION
• TOPOGRAPHY SHALL EXTENDED TO 20 FEET OUTSIDE LIMITS OF
BIO-RETENTION AREA.
CONTRACTOR SHALL PROVIDE SPECIFICATION SHEETS FOR MATERIALS USED
IN THE SCM SUCH AS PLANTING MEDIA, FILTER MEDIA AND AGGREGATE.
PROTECT PLANTING SOIL WITH PERIMETER SILT FENCE AND A TEMPORARY
COVER OF NON -WOVEN DRAINAGE (FILTER) FABRIC UNTIL COMPLETE SITE
STABILIZATION IS ACHIEVED.
REMOVE SILT FENCE AND DRAINAGE FABRIC AND INSTALL MULCH AND PLANT
MATERIAL ONCE SITE IS COMPLETELY STABILIZED WITH PERMANENT GROUND
COVER.
BIORETENTION STORMWATER CONTROL MEASURE (SCM)
OUTLET - aii
TO
SURFACE MIN.
12" UPTURNED ELBOW = (424.00)
FOR INTERNAL WATER
STORAGELAYER
INV ELEV: 421.99
0
VALVE
INV.: 425.62
4'-0"
0
- RIM ELEV= 427.22
-12" SHALLOW PONDING
"' -"'-"'-"' "' "' CONVERT TO 6" SOLID WALL 2 LF
12" UPTURNED ELBOW PVC PIPE PRIOR TO ENTERING
FOR IWS THE OUTLET STRUCTURE (TYP.)
SHWT ELEV= 420.00' o
BIORETENTION SECTION
N.T.S.
8-FT WEIR WIDTH
3 3
�1 1�
SPILLWAY CREST ELEV: 428.00
EMERGENCY SPILLWAY SECTION
SCALE: N.T.S.
WELDED ALUMINUM BAR GRATING
3" x 3" OPENINGS
PEAKED ROOF TRASH RACK
A: MATERIAL: ALUMINUM WITH 25
/ YEAR DESIGN LIFE
°
4'-0" ° STAINLESS STEEL
BOLTS (TYP).
d
°° SOD ELEV.: 425.6
d dO
dd
°
° ° d
d d
° d d
d 5" MIN. WALL (TYP)
nBARREL
°
d OUTLET BARREL
ADDITIONAL CLASS B
CONCRETE IN BOTTOM OF
STUCTURE
d ° 9
Ln d
SECTION Z-Z
BIORETENTION AREA MAINTENANCE SCHEDULE
DESCRIPTION
METHOD
FREQUENCY
SEASON
SOIL
INSPECT AND REPAIR
VISUAL
MONTHLY
ALL
EROSION
GRASS
REPLACE ANY DEAD OR
SEE PLANTING
TWICE PER YEAR
MAR 15 - APR 30
DISEASED VEGETATION
SPECIFICATIONS
OCT 1 - NOV 30
CONSIDERED BEYOND
TREATMENT
TREAT ALL DISEASED
MECHANICAL
WHENEVER NEEDED
ALL
PLANTS NOT TO BE REMOVED
OR BY HAND
WATER PLANT MATERIAL
BY HAND
IMMEDIATELY AFTER
N/A
AND END OF EACH DAY
COMPLETION OF
FOR 14 CONSECUTIVE
PROJECT
DAYS AFTER PLANTING
MOW GRASS ONCE ESTABLISHED AS
MECHANICAL
MONTHLY
ALL
NECESSARY TO MAINTAIN PLANT HEALTH
CONTRACTOR SHALL BE RESPONSIBLE FOR MAINTENANCE UNTIL SUBSTANTIAL COMPLETION
AT WHICH TIME OWNER WILL ASSUME MAINTENANCE RESPONSIBILITY.
LANDSCAPE WARRANTIES SHALL APPLY TO BIORETENTION AREA PLANTINGS.
- SOD WITH CELEBRATION
BERMUDA
30-IN PLANTING SOIL BED
PLACE IN 10" LIFTS
LOOSELY COMPACTED
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033612
/ 51122
FNGINEE�y\N;����`
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RECORD DRAWING
THIS DOCUMENT DEPICTS THE ORIGINAL
3-IN WASHED SAND
DESIGN REVISED TO INCLUDE
NON -WOVEN FILTER FABRIC
CONSTRUCTION PHASE REVISIONS AND
9-IN #57 WASHED STONE
AS -BUILT INFORMATION FURNISHED
(4-IN MIN. ON TOP AND SIDES)
IN -PART BY OTHERS.
WHILE THE AS -BUILT INFORMATION IS
BELIEVED TO BE RELIABLE, THE
SUB -DRAIN 6" SCH 40 PVC
DESIGNER CANNOT ASSURE ITS
PERFORATED PIPE
ACCURACY, AND THUS IS NOT
RESPONSIBLE FOR THE ACCURACY OF
THIS DOCUMENT OR FOR ANY ERRORS
OR OMISSIONS WHICH MAY HAVE BEEN
INCORPORATED INTO IT AS A RESULT.
THOSE RELYING ON THIS DOCUMENT
ARE ADVISED TO OBTAIN INDEPENDENT
VERIFICATION OF ITS ACCURACY BEFORE
APPLYING IT FOR ANY PURPOSE.
12-IN THICK CLASS B
RIPRAP OVER FILTER
FABRIC
OUTLET STRUCTURE NOTES:
1. OUTLET STRUCTURE TO BE PRE -CAST OR CAST IN
PLACE.
2. CLASS "A" (3,000 PSI) CONCRETE TO BE USED.
3. FORMS ARE TO BE USED FOR THE CONSTRUCTION
OF THE BOTTOM SLAB.
4. ALL STRUCTURES OVER T-6" IN DEPTH TO BE
PROVIDED WITH STEPS V-2" ON CENTERS. STEPS
SHALL BE IN ACCORDANCE WITH STANDARD
840.66.
5. ALL PENETRATIONS TO BE WATERPROOF SEALED
WITH NON -SHRINK, HIGH -STRENGTH GROUT.
PLANTING SOIL BED MIXTURE
pH RANGE
5.2 TO 7.00
P-INDEX
10-30
SOLUBLE SALTS
500 PPM MAXIMUM
FINES (SILT AND CLAY)
9% (ACCEPTABLE RANGE: 8-15%)
SAND
82% (ACCEPTABLE RANGE: 75-85%)
ORGANIC MATERIAL (PINE BARK FINES)
9% (ACCEPTABLE RANGE: 5-10%)
PERMEABILITY
1"/HOUR MIN, 6"/HOUR MAX.
1-2"/HOUR PREFERRED
NOTES:
- PLANTING MEDIA FOR BIO-RETENTION SHOULD BE UNIFORM FREE OF
STONES, STUMPS, ROOTS OR OTHER SIMILAR MATERIAL GREATER THAN 2
INCHES AND MEET THE SPECIFICATION NOTED ABOVE.
- SM, ML, SC SOIL CLASSIFICATIONS (USCS)
- POSSIBLE SOURCE OF PLANTING SOIL BED MIXTURE: TRIANGLE
LANDSCAPE SUPPLIES
- PROTECT PLANTING SOIL WITH PERIMETER SILT FENCE AND INSTALL SOD
ON SIDE SLOPES.
- REMOVE SILT FENCE AND DRAINAGE FABRIC ONCE SITE IS STABILIZED
WITH PERMANENT GROUND COVER.
- INSTALL PLANT BED SOIL ONCE THE SITE IS STABILIZED AND THE
BIO-RETENTION AREA IS NO LONGER UTILIZED AS A TEMPORARY
SEDIMENT BASIN.
- PLACE IN 12-18" LOOSE LIFTS, LOOSELY COMPACTED
WITH BACKHOE BUCKET.
- PEFORATED SUB -DRAIN PIPES SHALL HAVE A MINIMUM OF 4 ROWS OF
STAGGERD PERFORATIONS EQUIDISTANT AROUND THE PERIMETER OF THE
PIPE, PERFORATIONS IN EACH ROW SHALL BE SPACED 6-IN O.C.
PERFORATION SHALL BE 3/8" DIAMETER.
N.T.S.
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42866
SHEET NO.
C5.7
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