SW5220103_Plansheet C502 - Misc. Detail_20220124

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PLAN VIEW
HORIZONTAL SCALE: 1"=io'
CAUTION!!!
The locations and elevations of existing
underground utilities as shown on this
drawing are only APPROXIMATE. No guarantee
is either expressed or implied as to the
completeness of accuracy thereof. The
contractor shall be exclusively responsible
for determining the exact utility locations
and elevations prior to the start of construction
N
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CONNECTING E^' T
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I\LI\VLLLV LIVVJ
L wtLULU IU bANU
REROLLED BAND WITH 0-RING GASKETS
48" O DETENTION SYSTEM
BACKFILL DETAIL
FILL ABOVE FABRIC CAN BE NORMAL
EMBANKMENT FILL. NEEDS TO BE PLACED
IN 8" LIFTS AND COMPACTED TO 90% MIN. DENSITY
PRIOR TO ANY GRANULAR BASE
NON -WOVEN
GEOTEXTILE
FABRIC
NON -WOVEN
GEOTEXTILE
FABRIC
3/8" MIN. STONE
COMPACTED TO
90% MIN. DENSITY
NOTE:
PIPE TO BE INSTALLED PER ASTM A 798
AASHTO Al IS THE PREFERRED BACKFILL MATERIAL. HOWEVER, OTHER GRANULAR
MATERIALS MAY BE USED. BECAUSE DETENTION SYSTEMS ARE OFTEN EXPOSED TO
HEAVY CONSTRUCTION LOADS DURING TOTAL COMPLETION OF THE PROJECT, THERE
IS NEED FOR EXTRA CARE.
TO HANDLE THESE LOADS, IF THE MINIMUM COVER IS MORE THAN THE DIAMETER/6
AND THE DIAMETER IS LESS THAN 84", A2 OR A3 MATERIAL MAY GENERALLY BE
USED IF THEY ARE PLACED IN 8" LIFTS AND COMPACTED TO 90% PROCTOR DENSITY.
AS PIPE DIAMETERS INCREASE AND COVER DECREASES(APPROACHING THE MINIMUM
COVER LEVEL), THE QUALITY OF THE BACKFILL AND COMPACTION DENSITY BECOME
MORE IMPORTANT. REv onTE DES(
STONE W/ 40%
4" MINIMUM OF
LOOSE GRANULAR
BEDDING
MAINTENANCE PLAN FOR DETENTION POND:
EVERY 3 MONTHS OR AFTER PERIODS OF HEAVY RAINFALL OF GREATER THAN 4" IN A 24 HOUR PERIOD
INSPECT THE FOLLOWING AREAS OF THE POND AND MAKE REPAIRS AS NECESSARY:
A.POND DAM EMBANKMENTS AND EMERGENCY SPILLWAYS
1. VEGETATION AND GROUND COVER ADEQUATE
2. SURFACE EROSION
3. ANIMAL BURROWS
4. UNAUTHORIZED PLANTING
5. CRACKING, BULGING, OR SLIDING OF DAM
a. UPSTREAM FACE
b. DOWNSTREAM FACE
C. AT OR BEYOND TOE (UPSTREAM & DOWNSTREAM)
Cl. EMERGENCY SPILLWAY
6. SEEPS/LEAKS ON DOWNSTREAM FACE.
7. SLOPE PROTECTION OR RIPRAP FAILURES
8. VERTICAL AND HORIZONTAL ALIGNMENT OF TOP OF DAM AS PER "AS -BUILT" PLANS
9. EMERGENCY SPILLWAY CLEAR OF OBSTRUCTIONS AND DEBRIS
B. RISER AND PRINCIPAL SPILLWAY, TYPE: REINFORCED CONCRETE
1. LOW FLOW ORIFICE OBSTRUCTED
2. LOW FLOW TRASH RACK
A. DEBRIS REMOVAL NECESSARY
B. CORROSION CONTROL
3. EXCESSIVE SEDIMENT ACCUMULATION INSIDE RISER
4. CONCRETE/MASONRY CONDITION RISER & BARRELS
A. CRACKS OR DISPLACEMENT
B. MINOR SPALLING (<1")
C. MAJOR SPALLING (REBARS EXPOSED)
D. JOINT FAILURES
E. WATER TIGHTNESS
C. CONDITION OF OUTFALLS INTO POND AREA
1. RIP RAP FAILURES
2. SLOPE INVERT EROSION
3. STORM DRAIN PIPES
4. ENDWALLSMEADWALLS
D. OTHER
1. ENCROACHMENTS ON POND OR EASEMENT AREA (BE SPECIFIC)
2. AESTHETICS
A. GRASS MOWING READ.
B. GRAFFITI REMOVAL REQD.C.
3. PUBLIC HAZARDS
4. MAINTENANCE ACCESS
DETENTION NOTES:
1. SHOP DRAWINGS MUST BE SUBMITTED TO DESIGN ENGINEER OF RECORD FOR APPROVAL BEFORE FABRICATION
2. ALL FITTING REINFORCEMENT CALCULATIONS TO BE PER ASTM A998
3. ALL 48" DIAMETER UNDERGROUND DETENTION PIPES TO BE 10 GAGE, ALUMINIZED TYPE II CMP WITH 5"xl" CORRUGATIONS.
4. ALL CMP ACCESS RISERS TO BE 36" DIA, 12 GAGE, ALUMINIZED TYPE II CMP, WITH 2-2/3"x 1/2" CORRUGATIONS. ALL CMP ACCESS RISERS TO HAVE INTERNAL LADDERS
INSTALLED PER DETAIL. CAST IRON GRATE AND FRAMES SHALL BE BARRY-CRAFT MODEL B-1982-HG SERIES OR EQUAL.
5. A CONCRETE BASE SLAB OR COLLAR MUST BE PLACED AROUND CMP ACCESS RISER AS PER MANHOLE CAP DETAIL.
6. ALL PIPE CONNECTIONS TO HAVE H-12 HUGGER CONNECTING BANDS WITH BAR, BOLT, AND STRAP CONNECTION. IF COLLECTION STORM SEWER OTHER THAN CMP IS
USED, A MAR -MAC COUPLER MUST BE USED IN LIEU OF H-12 HUGGER BANDS.
UNDERGROUND DETENTION INSTALLATION SPECIFICATION:
PRE -CONSTRUCTION MEETING
PRIOR TO INSTALLATION OF THE DETENTION SYSTEM A PRE -CONSTRUCTION MEETING SHOULD BE CONDUCTED. AT A MINIMUM THE ENGINEER, INSTALLER AND MATERIAL
SUPPLIER SHOULD BE IN ATTENDANCE.
FOUNDATION AND BEDDING
PRIOR TO PLACING ANY BEDDING THE FOUNDATION SHOULD BE UNIFORM AND STABLE. ANY UNSUITABLE FOUNDATION MATERIAL SHALL BE REMOVED. AT A MINIMUM 4
INCHES OF A WELL GRADED GRANULAR MATERIAL SHALL BE PLACED AS THE BEDDING (#57 STONE OR SIMILIAR IF THERE IS NO SUITABLE ON SITE MATERIAL)
BACKFILL
THE BACKFILL MATERIAL SHALL BE AN Al, A2, OR A3 GRANULAR FILL PER AASHTO M-145, LOCAL SOILS MAY MEET THE MATERIAL REQUIREMENTS BUT SHOULD BE APPROVED
BY THE GEOTECHNICAL ENGINEER. THE MATERIAL SHALL BE PLACED IN EQUAL LIFTS AND COMPACTED TO 90% AASHTO T99 STANDARD PROCTOR DENSITY. THE BACKFILL
SHOULD BE CAREFULLY PLACED AND COMPACTED UNDER AND AROUND THE PIPE HAUNCHES. THE BACKFILL SHOULD BE PLACED ENENLY ON BOTH SIDES OF THE
STRUCTURE AND ADVANCED ALONG THE PIPE LENGTH AT THE SAME RATE TO AVOID DIFFERENTIAL LOADING
SEE BACKFILL DETAIL THIS PAGE.
JOINT PERFORMANCE:
JOINTS SHALL MEET THE WATERTIGHT REQUIREMENTS OF ASTM C696 AND ITS APPENDICES EXCEPT THAT THE ALLOWABLE EXFILTRATION RATE SHALL BE 50 GAL / (INCH
DIAMETER)(MILE OF PIPE)(24 HR). TESTING WILL BE REQUIRED TO SHOW THAT THIS REQUIREMENT HAS BEEN MET.
MINIMUM COVER:
COVER SHOULD BE PLACED TO THE PROPER ELEVATION AS OUTLINED IN THE PLANS. CONSTRUCTION LOADINGS NEED TO BE DETERMINED BASED ON THE TYPE OF
EQUIPMENT PLANNED TO BE USED DURING CONSTRUCTION. MINIMUM COVER FOR CONSTRUCTION EQUIPMENT IS DIFFERENT THAN STANDARD VEHICLE LOADINGS AND
SHOULD BE CAREFULLY ASSESSED PRIOR TO PLACING ANY EQUIPMENT ON THE STRUCTURE. FOLLOW THE CHART AS OUTLINES IN THE NCSPA INSTALLATION GUIDELINES
MINIMUM COVER FOR CONSTRUCTION LOADS:
PIPE SPAN, IN. 18-50 KIPS 50-75 KIPS 75-110 KIPS110 150 KIPS
1 12-42 2.OFT 2.5FT 3.0 FT 3.0 FT 1
48-72 3.OFT 3.OFT 3.5 FT 4.0 FT NOTE: SPEC ON CONSTRUCTION LOADING
1 78-120 3.OFT 3.5FT 4.0 FT 4.0 FT 1
126-144 3.5FT 4.OFT 4.5 FT 4.5 FT FOR UNDERGROUND DETENTION MUST
-----------------� MEET MIN. LOADING SPEC
AT ALL TIMES.
C NCRETE-
CAP (by others)
LADDER
WISER DET- /I
r4l<
CORRUGATED
PIPE
HA. = 36"
TO ABSORB TRAFFIC LOADINGS
8" MIN.
1" Min. Space MAII\
CSP RISER
MAINLINE
DIAMETER = 48" 4'
(CORRUGATED STEEL PIPE)
CROSS-SECTION
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INLET H
CONCRETE
24 HOUR CONTACT:
FORREST PETERS
850-225-0072
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THESE DRAWINGS ARE THE
PROPERTY OF ONSITE CIVIL
GROUP, LLC AND SHALL NOT BE
REPRODUCED IN WHOLE OR IN
PART WITHOUT THE EXPRESS
WRITTEN PERMISSION OF
ONSITE CIVIL GROUP, LLC.
CAROZ
ESS i0
PROFESSIONAL
m
F� F'VG I NEED
�M/CHAE�'/
1/18/22
REVISIONS
No. DATE DESCRIPTION
•
20
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POND BMP
DETAIL PLAN
DATE: 1/18/22
PROJECT: 21-051
SHEET: C 502