HomeMy WebLinkAboutPLANS - 14-00334 - 460 S 2nd W - Alpine Chalet - Electrical Flood Damage174'-23 4"
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DYODS
CHECKED:
DRAWN:
DYODS
DESIGNED:
APPROVED:
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4
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SHEET NO.:
7/28/2017
DATE:PROJECT No.:
4524-1
SEQ. No.:
0
D1
CONTECH
DRAWING
DYODS
800-338-1122 513-645-7000 513-645-7993 FAXREVISION DESCRIPTIONDATE BY
NOTES
x ALL RISER AND STUB DIMENSIONS ARE TO CENTERLINE. ALL ELEVATIONS, DIMENSIONS, AND LOCATIONS OF
RISERS AND INLETS, SHALL BE VERIFIED BY THE ENGINEER OF RECORD PRIOR TO RELEASING FOR
FABRICATION.
x ALL FITTINGS AND REINFORCEMENT COMPLY WITH ASTM A998.
x ALL RISERS AND STUBS ARE 2 2 3" x 12" CORRUGATION AND 16 GAGE UNLESS OTHERWISE NOTED.
x RISERS TO BE FIELD TRIMMED TO GRADE.
x QUANTITY OF PIPE SHOWN DOES NOT PROVIDE EXTRA PIPE FOR CONNECTING THE SYSTEM TO EXISTING
PIPE OR DRAINAGE STRUCTURES. OUR SYSTEM AS DETAILED PROVIDES NOMINAL INLET AND/OR OUTLET
PIPE STUB FOR CONNECTION TO EXISTING DRAINAGE FACILITIES. IF ADDITIONAL PIPE IS NEEDED IT IS THE
RESPONSIBILITY OF THE CONTRACTOR.
x BAND TYPE TO BE DETERMINED UPON FINAL DESIGN.
x THE PROJECT SUMMARY IS REFLECTIVE OF THE DYODS DESIGN, QUANTITIES ARE APPROX. AND SHOULD
BE VERIFIED UPON FINAL DESIGN AND APPROVAL. FOR EXAMPLE, TOTAL EXCAVATION DOES NOT
CONSIDER ALL VARIABLES SUCH AS SHORING AND ONLY ACCOUNTS FOR MATERIAL WITHIN THE
ESTIMATED EXCAVATION FOOTPRINT.
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor by
Contech Engineered Solutions LLC ("Contech"). Neither this
drawing, nor any part thereof , may be used, reproduced or
modified in any manner without the prior written consent of
Contech. Failure to comply is done at the user's own risk and
Contech expressly disclaims any liability or responsibility for
such use.
If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies must be reported
to Contech immediately for re-evaluation of the design. Contech
accepts no liability for designs based on missing, incomplete or
inaccurate information supplied by others.
www.ContechES.com
NOTE:
THESE DRAWINGS ARE FOR CONCEPTUAL
PURPOSES AND DO NOT REFLECT ANY LOCAL
PREFERENCES OR REGULATIONS. PLEASE
CONTACT YOUR LOCAL CONTECH REP FOR
MODIFICATIONS.
CALCULATION DETAILS
x LENGTH PER BARREL = 174 FT
x LENGTH PER HEADER = 14 FT
x LOADING = H20 & H25
x APPROX. CMP FOOTAGE = 870 FT
PIPE DETAILS
x DIAMETER = 24 IN
x CORRUGATION = 2-2/3" X 1/2"
x GAGE = 18
x COATING = ALUMINIZED STEEL
TYPE 2 (ALT2)
x WALL TYPE = PERFORATED
x BARREL SPACING = 12 IN
BACKFILL DETAILS
x WIDTH AT ENDS = 12 IN
x ABOVE PIPE = 6 IN
x WIDTH AT SIDES = 12 IN
x BELOW PIPE = 6 IN
STORAGE SUMMARY
x STORAGE VOLUME REQUIRED 5,000 CF
x PIPE STORAGE = 2,733 CF
x STRUCTURAL BACKFILL STORAGE = 2,285 CF
x TOTAL STORAGE PROVIDED = 5,019 CF
ASSEMBLY
SCALE: 1" = 20'
PROJECT SUMMARY
DYODS - 4524-1-0
PROJECT NAME: Alpine Chalet Apartments
Rexburg, ID
DESCRIPTION: OPTION 1
KEY
1.) RIGID OR FLEXIBLE PAVEMENT
2.) GRANULAR ROAD BASE
3.) 12" MIN. FOR DIAMETERS THROUGH 96"
18" MIN. FOR DIAMETERS FROM 102"
AND LARGER MEASURED TO TOP OF
RIGID OR BOTTOM OF FLEXIBLE
PAVEMENT.
4.) FREE DRAINING ANGULAR WASHED
STONE 3/4" - 2" MIN. PARTICLE SIZE.
5.) GRANULAR BEDDING, ROUGHLY
SHAPED TO FIT THE BOTTOM OF PIPE,
4"- 6" IN DEPTH.
6.) CONTECH C-40 OR C-45
NON-WOVEN GEOTEXTILE
REQUIRED, WRAPPING TRENCH
ONLY.
3
1
2
FOUNDATION/BEDDING PREPARATION
PRIOR TO PLACING THE BEDDING, THE FOUNDATION MUST BE CONSTRUCTED TO
A UNIFORM AND STABLE GRADE. IN THE EVENT THAT UNSUITABLE FOUNDATION
MATERIALS ARE ENCOUNTERED DURING EXCAVATION, THEY SHALL BE REMOVED
AND BROUGHT BACK TO THE GRADE WITH A FILL MATERIAL AS APPROVED BY
THE ENGINEER. ONCE THE FOUNDATION PREPARATION IS COMPLETE, THE
4 INCHES OF A WELL-GRADED GRANULAR MATERIAL SHALL BE PLACED AS THE
BEDDING.
BACKFILL
THE BACKFILL MATERIAL SHALL BE FREE-DRAINING ANGULAR WASHED STONE
3/4" - 2" PARTICLE SIZE. MATERIAL SHALL BE PLACED IN 8"-10" MAXIMUM LIFTS.
MATERIAL SHALL BE WORKED INTO THE PIPE HAUNCHES BY MEANS OF SHOVEL-
SLICING, RODDING, AIR-TAMPER, VIBRATORY ROD, OR OTHER EFFECTIVE METHODS
COMPACTION IS CONSIDERED ADEQUATE WHEN NO FURTHER YIELDING OF THE
MATERIAL IS OBSERVED UNDER THE COMPACTOR, OR UNDER FOOT, AND THE PROJECT
ENGINEER OR HIS REPRESENTATIVE IS SATISFIED WITH THE LEVEL OF COMPACTION.
INADEQUATE COMPACTION CAN LEAD TO EXCESSIVE DEFLECTIONS WITHIN THE SYSTEM
AND SETTLEMENT OF THE SOILS OVER THE SYSTEM. BACKFILL SHALL BE PLACED SUCH
THAT THERE IS NO MORE THAN A TWO-LIFT DIFFERENTIAL BETWEEN THE SIDES OF ANY
PIPE IN THE SYSTEM AT ALL TIMES DURING THE BACKFILL PROCESS. BACKFILL SHALL
BE ADVANCED ALONG THE LENGTH OF THE SYSTEM AT THE SAME RATE TO AVOID
DIFFERENTIAL LOADING ON ANY PIPES IN THE SYSTEM.
EQUIPMENT USED TO PLACE AND COMPACT THE BACKFILL SHALL BE OF A SIZE AND
TYPE SO AS NOT TO DISTORT, DAMAGE, OR DISPLACE THE PIPE. ATTENTION MUST
BE GIVEN TO PROVIDING ADEQUATE MINIMUM COVER FOR SUCH EQUIPMENT, AND
MAINTAINING BALANCED LOADING ON ALL PIPES IN THE SYSTEM, DURING ALL
SUCH OPERATIONS.
OTHER ALTERNATE BACKFILL MATERIAL MAY BE ALLOWED DEPENDING ON SITE
SPECIFIC CONDITIONS. REFER TO TYPICAL BACKFILL DETAIL FOR MATERIAL
REQUIRED.
4
5
6
6
TYPICAL SECTION VIEW
LINER OVER ROWS
SCALE: N.T.S.
LIMITS OF
REQUIRED
BACKFILL
20 MIL PE IMPERMEABLE
LINER OVER TOP OF PIPE
(IF REQUIRED)
NOTE: IF SALTING AGENTS FOR SNOW AND ICE REMOVAL ARE USED ON OR NEAR
THE PROJECT, A GEOMEMBRANE BARRIER IS RECOMMENDED WITH THE SYSTEM.
THE GEOMEMBRANE LINER IS INTENDED TO HELP PROTECT THE SYSTEM FROM
THE POTENTIAL ADVERSE EFFECTS THAT MAY RESULT FROM A CHANGE IN THE
SURROUNDING ENVIRONMENT OVER A PERIOD OF TIME. PLEASE REFER TO THE
CORRUGATED METAL PIPE DETENTION DESIGN GUIDE FOR ADDITIONAL
INFORMATION.
7%'TBD" TYP.TBD" TYP.
TYPICAL PERFORATION DETAIL
SCALE: N.T.S.
1.
5
0
"
2.8"
COIL WIDTH
2 2/3" x 1/2" CORRUGATION - STEEL AND ALUMINUM CMP
EDGE SPACING EQUAL ON BOTH SIDES
OPEN AREA = 3.76 SQ IN/SQ FT
2.0
5
"
NOTES:
1.PERFORATIONS MEET AASHTO AND ASTM SPECIFICATIONS.
2.PERFORATION OPEN AREA PER SQUARE FOOT OF PIPE IS BASED ON
THE NOMINAL DIAMETER AND LENGTH OF PIPE.
3.ALL DIMENSIONS ARE SUBJECT TO MANUFACTURING TOLERANCES.
4.$//+2/(6
2.
0
0
"
3.54"
COIL WIDTH
3" x 1" CORRUGATION - STEEL AND ALUMINUM CMP
(COIL PROVIDED FROM CONTECH LANTANA, FL PLANT)
OPEN AREA = 4.16 SQ IN/SQ FT
2.0
4
"
1.
7
5
"
C
C
TY
P
2.711"
9@2.711" = 24.399"
COIL WIDTH
5" x 1" CORRUGATION - STEEL ONLY
EDGE SPACING EQUAL ON BOTH SIDES
OPEN AREA = 3.33 SQ IN/SQ FT
DYODS
CHECKED:
DRAWN:
DYODS
DESIGNED:
APPROVED:
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SHEET NO.:
7/28/2017
DATE:PROJECT No.:
4524-1
SEQ. No.:
0
D2
CONTECH
DRAWING
DYODS
800-338-1122 513-645-7000 513-645-7993 FAXREVISION DESCRIPTIONDATE BY
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor by
Contech Engineered Solutions LLC ("Contech"). Neither this
drawing, nor any part thereof , may be used, reproduced or
modified in any manner without the prior written consent of
Contech. Failure to comply is done at the user's own risk and
Contech expressly disclaims any liability or responsibility for
such use.
If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies must be reported
to Contech immediately for re-evaluation of the design. Contech
accepts no liability for designs based on missing, incomplete or
inaccurate information supplied by others.
www.ContechES.com
TYPICAL RISER DETAIL
SCALE: N.T.S.
ELEVATION END
RISER (TYP.)
SEE DETAIL
3
,
3
(
2'-6"
3,3(
2'-6"
3
,
3
(
PLAN
FRONT
TYPICAL MANWAY DETAIL
SCALE: N.T.S.
NOTE:
MANWAY DETAIL APPLICABLE FOR CMP
SYSTEMS WITH DIAMETERS 48" AND
LARGER. MANWAYS MAY BE REQUIRED
ON SMALLER SYSTEMS DEPENDING ON
ACTUAL SITE SPECIFIC CONDITIONS.
NOTE:
LADDERS ARE OPTIONAL AND ARE NOT
REQUIRED FOR ALL SYSTEMS.
NOTE:
THESE DRAWINGS ARE FOR CONCEPTUAL
PURPOSES AND DO NOT REFLECT ANY LOCAL
PREFERENCES OR REGULATIONS. PLEASE
CONTACT YOUR LOCAL CONTECH REP FOR
MODIFICATIONS.
DYODS - 4524-1-0
PROJECT NAME: Alpine Chalet Apartments
Rexburg, ID
DESCRIPTION: OPTION 1
BACKFILL DETAIL
SCALE: N.T.S.
DYODS
CHECKED:
DRAWN:
DYODS
DESIGNED:
APPROVED:
C:
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SHEET NO.:
7/28/2017
DATE:PROJECT No.:
4524-1
SEQ. No.:
0
D3
CONTECH
DRAWING
DYODS
800-338-1122 513-645-7000 513-645-7993 FAXREVISION DESCRIPTIONDATE BY
CONSTRUCTION LOADS
FOR TEMPORARY CONSTRUCTION VEHICLE LOADS, AN EXTRA AMOUNT OF COMPACTED COVER MAY BE REQUIRED OVER
THE TOP OF THE PIPE. THE HEIGHT-OF-COVER SHALL MEET THE MINIMUM REQUIREMENTS SHOWN IN THE TABLE BELOW.
THE USE OF HEAVY CONSTRUCTION EQUIPMENT NECESSITATES GREATER PROTECTION FOR THE PIPE THAN FINISHED
GRADE COVER MINIMUMS FOR NORMAL HIGHWAY TRAFFIC.
PIPE SPAN,
INCHES 18-50
MINIMUM COVER (FT)
AXLE LOADS (kips)
50-75 75-110 110-150
12-42 2.0 2.5 3.0 3.0
4.03.53.048-72 3.0
3.078-120 3.5 4.0 4.0
4.54.54.0126-144 3.5
*MINIMUM COVER MAY VARY, DEPENDING ON LOCAL CONDITIONS. THE CONTRACTOR MUST PROVIDE THE ADDITIONAL
COVER REQUIRED TO AVOID DAMAGE TO THE PIPE. MINIMUM COVER IS MEASURED FROM THE TOP OF THE PIPE TO
THE TOP OF THE MAINTAINED CONSTRUCTION ROADWAY SURFACE.
FINISHED
GRADE
TEMPORARY COVER FOR
CONSTRUCTION LOADS
HEIGHT
OF
COVER
SCOPE
THIS SPECIFICATION COVERS THE MANUFACTURE AND INSTALLATION OF
THE DESIGNED DETENTION SYSTEM DETAILED IN THE PROJECT PLANS.
MATERIAL
THE MATERIAL SHALL CONFORM TO THE APPLICABLE REQUIREMENTS
LISTED BELOW:
ALUMINIZED TYPE 2 STEEL COILS SHALL CONFORM TO THE
APPLICABLE REQUIREMENTS OF AASHTO M-274 OR ASTM A-92.
THE GALVANIZED STEEL COILS SHALL CONFORM TO THE
APPLICABLE REQUIREMENTS OF AASHTO M-218 OR ASTM A-929.
THE POLYMER COATED STEEL COILS SHALL CONFORM TO THE
APPLICABLE REQUIREMENTS OF AASHTO M-246 OR ASTM A-742.
THE ALUMINUM COILS SHALL CONFORM TO THE APPLICABLE
REQUIREMENTS OF AASHTO M-197 OR ASTM B-744.
CONSTRUCTION LOADS
CONSTRUCTION LOADS MAY BE HIGHER THAN FINAL LOADS. FOLLOW THE
MANUFACTURER'S OR NCSPA GUIDELINES.
PIPE
THE PIPE SHALL BE MANUFACTURED IN ACCORDANCE TO THE APPLICABLE
REQUIREMENTS LISTED BELOW:
ALUMINIZED TYPE 2: AASHTO M-36 OR ASTM A-760
GALVANIZED: AASHTO M-36 OR ASTM A-760
POLYMER COATED: AASHTO M-245 OR ASTM A-762
ALUMINUM: AASHTO M-196 OR ASTM B-745
HANDLING AND ASSEMBLY
SHALL BE IN ACCORDANCE WITH NCSP'S (NATIONAL CORRUGATED STEEL
PIPE ASSOCIATION) FOR ALUMINIZED TYPE 2, GALVANIZED OR POLYMER
COATED STEEL. SHALL BE IN ACCORDANCE WITH THE MANUFACTURER'S
RECOMMENDATIONS FOR ALUMINUM PIPE.
INSTALLATION
SHALL BE IN ACCORDANCE WITH AASHTO STANDARD SPECIFICATIONS FOR
HIGHWAY BRIDGES, SECTION 26, DIVISION II DIVISION II OR ASTM A-798 (FOR
ALUMINIZED TYPE 2, GALVANIZED OR POLYMER COATED STEEL) OR ASTM
B-788 (FOR ALUMINUM PIPE) AND IN CONFORMANCE WITH THE PROJECT
PLANS AND SPECIFICATIONS. IF THERE ARE ANY INCONSISTENCIES OR
CONFLICTS THE CONTRACTOR SHOULD DISCUSS AND RESOLVE WITH THE
SITE ENGINEER.
IT IS ALWAYS THE RESPONSIBILITY OF THE CONTRACTOR TO FOLLOW
OSHA GUIDELINES FOR SAFE PRACTICES.
SPECIFICATION FOR DESIGNED DETENTION SYSTEM:
8"
11" TYP.
2"
1"
G
A
P
(
T
Y
P
.
A
L
L
SI
D
E
S
)
NOTES:
1. DESIGN IN ACCORDANCE WITH AASHTO, 17th EDITION.
2. DESIGN LOAD HS25.
3. EARTH COVER = 1' MAX.
4. CONCRETE STRENGTH = 3,500 psi
5. REINFORCING STEEL = ASTM A615, GRADE 60.
6. PROVIDE ADDITIONAL REINFORCING AROUND
OPENINGS EQUAL TO THE BARS INTERRUPTED,
HALF EACH SIDE. ADDITIONAL BARS TO BE IN
THE SAME PLANE.
A
A
2" COVER
(TYP)
SECTION VIEW
ROUND OPTION PLAN VIEW SQUARE OPTION PLAN VIEW
&035,6(5
INTERRUPTED BAR
REPLACEMENT,
SEE NOTE 6.
STANDARD
REINFORCING,
SEE TABLE
OPENING IN
PROTECTION
SLAB FOR
CASTING
#4 DIAGONAL TRIM
BAR (TYP. 4 PLACES),
SEE NOTE 7.
$
INTERRUPTED BAR
REPLACEMENT, SEE
NOTE 6.
%
OPENING IN
PROTECTION
SLAB FOR
CASTING
#4 DIAGONAL TRIM
BAR (TYP. 4 PLACES),
SEE NOTE 7.
STANDARD
REINFORCING,
SEE TABLE
GASKET MATERIAL
SUFFICIENT TO PREVENT
SLAB FROM BEARING ON
RISER TO BE PROVIDED BY
CONTRACTOR.
2
"
C
O
V
E
R
(
T
Y
P
.
)
%
ACCESS CASTING TO BE
PROVIDED AND INSTALLED
BY CONTRACTOR.
REINFORCING TABLE
&03
RISER A %REINFORCING
**BEARING
PRESSURE
(PSF)
24"
4'X4'26"#5 @ 12" OCEW
#5 @ 12" OCEW
2,410
1,780
30"
4'-6" X 4'-6"32"#5 @ 12" OCEW
#5 @ 12" OCEW
2,120
1,530
36"
5' X 5'38"#5 @ 10" OCEW
#5 @ 10" OCEW
1,890
1,350
42"
5'-6" X 5'-6"44"#5 @ 10" OCEW
#5 @ 9" OCEW
1,720
1,210
48"
6' X 6'50"#5 @ 9" OCEW
#5 @ 8" OCEW
1,600
1,100
** ASSUMED SOIL BEARING CAPACITY
1'
-
0
"
A
2" C
O
V
E
R
(TY
P
.
)
2" C
O
V
E
R
(TY
P
)
7. TRIM OPENING WITH DIAGONAL #4 BARS, EXTEND
BARS A MINIMUM OF 12" BEYOND OPENING, BEND
BARS AS REQUIRED TO MAINTAIN BAR COVER.
8. PROTECTION SLAB AND ALL MATERIALS TO BE
PROVIDED AND INSTALLED BY CONTRACTOR.
9. DETAIL DESIGN BY DELTA ENGINEERING, BINGHAMTON, NY.
%
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor by
Contech Engineered Solutions LLC ("Contech"). Neither this
drawing, nor any part thereof , may be used, reproduced or
modified in any manner without the prior written consent of
Contech. Failure to comply is done at the user's own risk and
Contech expressly disclaims any liability or responsibility for
such use.
If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies must be reported
to Contech immediately for re-evaluation of the design. Contech
accepts no liability for designs based on missing, incomplete or
inaccurate information supplied by others.
www.ContechES.com
NOTE:
THESE DRAWINGS ARE FOR CONCEPTUAL
PURPOSES AND DO NOT REFLECT ANY LOCAL
PREFERENCES OR REGULATIONS. PLEASE
CONTACT YOUR LOCAL CONTECH REP FOR
MODIFICATIONS.
DYODS - 4524-1-0
PROJECT NAME: Alpine Chalet Apartments
Rexburg, ID
DESCRIPTION: OPTION 1
MANHOLE CAP DETAIL
SCALE: N.T.S.
CONSTRUCTION LOADING DIAGRAM
SCALE: N.T.S.
DYODS
CHECKED:
DRAWN:
DYODS
DESIGNED:
APPROVED:
C:
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:
4
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A
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SHEET NO.:
7/28/2017
DATE:PROJECT No.:
4524-1
SEQ. No.:
0
D4
CONTECH
DRAWING
DYODS
800-338-1122 513-645-7000 513-645-7993 FAXREVISION DESCRIPTIONDATE BY
The design and information shown on this drawing is provided
as a service to the project owner, engineer and contractor by
Contech Engineered Solutions LLC ("Contech"). Neither this
drawing, nor any part thereof , may be used, reproduced or
modified in any manner without the prior written consent of
Contech. Failure to comply is done at the user's own risk and
Contech expressly disclaims any liability or responsibility for
such use.
If discrepancies between the supplied information upon which
the drawing is based and actual field conditions are encountered
as site work progresses, these discrepancies must be reported
to Contech immediately for re-evaluation of the design. Contech
accepts no liability for designs based on missing, incomplete or
inaccurate information supplied by others.
www.ContechES.com
CMP DETENTION INSTALLATION GUIDE
PROPER INSTALLATION OF A FLEXIBLE UNDERGROUND DETENTION SYSTEM
WILL ENSURE LONG-TERM PERFORMANCE. THE CONFIGURATION OF THESE
SYSTEMS OFTEN REQUIRES SPECIAL CONSTRUCTION PRACTICES THAT
DIFFER FROM CONVENTIONAL FLEXIBLE PIPE CONSTRUCTION. CONTECH
ENGINEERED SOLUTIONS STRONGLY SUGGESTS SCHEDULING A
PRE-CONSTRUCTION MEETING WITH YOUR LOCAL SALES ENGINEER TO
DETERMINE IF ADDITIONAL MEASURES, NOT COVERED IN THIS GUIDE, ARE
APPROPRIATE FOR YOUR SITE.
FOUNDATION
CONSTRUCT A FOUNDATION THAT CAN SUPPORT THE DESIGN LOADING
APPLIED BY THE PIPE AND ADJACENT BACKFILL WEIGHT AS WELL AS
MAINTAIN ITS INTEGRITY DURING CONSTRUCTION.
IF SOFT OR UNSUITABLE SOILS ARE ENCOUNTERED, REMOVE THE POOR
SOILS DOWN TO A SUITABLE DEPTH AND THEN BUILD UP TO THE
APPROPRIATE ELEVATION WITH A COMPETENT BACKFILL MATERIAL. THE
STRUCTURAL FILL MATERIAL GRADATION SHOULD NOT ALLOW THE
MIGRATION OF FINES, WHICH CAN CAUSE SETTLEMENT OF THE DETENTION
SYSTEM OR PAVEMENT ABOVE. IF THE STRUCTURAL FILL MATERIAL IS NOT
COMPATIBLE WITH THE UNDERLYING SOILS AN ENGINEERING FABRIC
SHOULD BE USED AS A SEPARATOR. IN SOME CASES, USING A STIFF
REINFORCING GEOGRID REDUCES OVER EXCAVATION AND REPLACEMENT
FILL QUANTITIES.
GRADE THE FOUNDATION SUBGRADE TO A UNIFORM OR SLIGHTLY SLOPING
GRADE. IF THE SUBGRADE IS CLAY OR RELATIVELY NON-POROUS AND THE
CONSTRUCTION SEQUENCE WILL LAST FOR AN EXTENDED PERIOD OF TIME,
IT IS BEST TO SLOPE THE GRADE TO ONE END OF THE SYSTEM. THIS WILL
ALLOW EXCESS WATER TO DRAIN QUICKLY, PREVENTING SATURATION OF
THE SUBGRADE.
BEDDING
A 4 TO 6-INCH THICK, WELL-GRADED, GRANULAR MATERIAL IS THE
PREFERRED PIPE BEDDING. IF CONSTRUCTION EQUIPMENT WILL OPERATE
FOR AN EXTENDED PERIOD OF TIME ON THE BEDDING, USE EITHER AN
ENGINEERING FABRIC OR A STIFF GEOGRID TO ENSURE THE BASE
MATERIAL MAINTAINS ITS INTEGRITY.
USING AN OPEN-GRADED BEDDING MATERIAL IS ACCEPTABLE; HOWEVER,
AN ENGINEERING FABRIC SEPARATOR IS REQUIRED BETWEEN THE BASE
AND THE SUBGRADE.
GRADE THE BASE TO A SMOOTH, UNIFORM GRADE TO ALLOW FOR THE
PROPER PLACEMENT OF THE PIPE.
IN-SITU TRENCH WALL
IF EXCAVATION IS REQUIRED, THE TRENCH WALL NEEDS TO BE CAPABLE OF
SUPPORTING THE LOAD THAT THE PIPE SHEDS AS THE SYSTEM IS LOADED. IF
SOILS ARE NOT CAPABLE OF SUPPORTING THESE LOADS, THE PIPE CAN
DEFLECT. PERFORM A SIMPLE SOIL PRESSURE CHECK USING THE APPLIED
LOADS TO DETERMINE THE LIMITS OF EXCAVATION BEYOND THE SPRING LINE OF
THE OUTER MOST PIPES.
IN MOST CASES THE REQUIREMENTS FOR A SAFE WORK ENVIRONMENT AND
PROPER BACKFILL PLACEMENT AND COMPACTION TAKE CARE OF THIS CONCERN.
BACKFILL MATERIAL
TYPICALLY, THE BEST BACKFILL MATERIAL IS AN ANGULAR, WELL-GRADED,
GRANULAR FILL MEETING THE REQUIREMENTS OF AASHTO A-1, A-2 OR
A-3. IN SOME CASES, IT MAY BE DESIRABLE TO USE A UNIFORMLY GRADED
MATERIAL FOR THE FIRST 18- TO 24-INCHES. THIS TYPE OF MATERIAL IS EASIER
TO PLACE UNDER THE HAUNCHES OF THE PIPE AND REQUIRES LITTLE
COMPACTIVE EFFORT. DEPENDING ON THE BEDDING MATERIAL, A SEPARATION
GEOTEXTILE MIGHT BE REQUIRED ABOVE AND BELOW THESE INITIAL LIFTS.
OPEN-GRADED FILL IS TYPICALLY NOT USED BEYOND THE INITIAL 18- TO
24-INCHES BECAUSE THIS TYPE OF FILL OFTEN DOES NOT PROVIDE ADEQUATE
CONFINING RESTRAINT TO THE PIPES. IF A UNIFORMLY GRADED MATERIAL
(PARTICLES ALL ONE SIZE) IS USED, INSTALL A GEOTEXTILE SEPARATION FABRIC
TO PREVENT THE MIGRATION OF FINES INTO THE BACKFILL.
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PLACEMENT AND ADEQUATE COMPACTION OF THE BACKFILL. WORK CLOSELY
WITH THE LOCAL CONTECH SALES ENGINEER REGARDING THE SPECIAL
INSTALLATION TECHNIQUES REQUIRED WHEN USING CLSM.
BACKFILL PLACEMENT
PLACE BACKFILL IN 8-INCH LOOSE LIFTS AND COMPACT TO 90% AASHTO T99
STANDARD PROCTOR DENSITY. MATERIAL SHALL BE WORKED INTO THE PIPE
HAUNCHES BY MEANS OF SHOVEL-SLICING, RODDING, AIR TAMPER, VIBRATORY
ROD, OR OTHER EFFECTIVE METHODS.
IF AASHTO T99 PROCEDURES ARE DETERMINED INFEASIBLE BY THE
GEOTECHNICAL ENGINEER OF RECORD, COMPACTION IS CONSIDERED
ADEQUATE WHEN NO FURTHER YIELDING OF THE MATERIAL IS OBSERVED
UNDER THE COMPACTOR, OR UNDER FOOT, AND THE GEOTECHNICAL
ENGINEER OF RECORD (OR REPRESENTATIVE THEREOF) IS SATISFIED WITH
THE LEVEL OF COMPACTION.
FOR LARGE SYSTEMS, CONVEYOR SYSTEMS, BACKHOES WITH LONG
REACHES OR DRAGLINES WITH STONE BUCKETS MAY BE USED TO PLACE
BACKFILL. ONCE MINIMUM COVER FOR CONSTRUCTION LOADING ACROSS
THE ENTIRE WIDTH OF THE SYSTEM IS REACHED, ADVANCE THE EQUIPMENT
TO THE END OF THE RECENTLY PLACED FILL, AND BEGIN THE SEQUENCE
AGAIN UNTIL THE SYSTEM IS COMPLETELY BACKFILLED. THIS TYPE OF
CONSTRUCTION SEQUENCE PROVIDES ROOM FOR STOCKPILED BACKFILL
DIRECTLY BEHIND THE BACKHOE, AS WELL AS THE MOVEMENT OF
CONSTRUCTION TRAFFIC. MATERIAL STOCKPILES ON TOP OF THE
BACKFILLED DETENTION SYSTEM SHOULD BE LIMITED TO 8- TO 10-FEET HIGH
AND MUST PROVIDE BALANCED LOADING ACROSS ALL BARRELS. TO
DETERMINE THE PROPER COVER OVER THE PIPES TO ALLOW THE
MOVEMENT OF CONSTRUCTION EQUIPMENT SEE TABLE 1, OR CONTACT
YOUR LOCAL CONTECH SALES ENGINEER.
WHEN FLOWABLE FILL IS USED, YOU MUST PREVENT PIPE FLOATATION.
TYPICALLY, SMALL LIFTS ARE PLACED BETWEEN THE PIPES AND THEN
ALLOWED TO SET-UP PRIOR TO THE PLACEMENT OF THE NEXT LIFT. THE
ALLOWABLE THICKNESS OF THE CLSM LIFT IS A FUNCTION OF A PROPER
BALANCE BETWEEN THE UPLIFT FORCE OF THE CLSM, THE OPPOSING
WEIGHT OF THE PIPE, AND THE EFFECT OF OTHER RESTRAINING MEASURES.
THE PIPE CAN CARRY LIMITED FLUID PRESSURE WITHOUT PIPE DISTORTION
OR DISPLACEMENT, WHICH ALSO AFFECTS THE CLSM LIFT THICKNESS. YOUR
LOCAL CONTECH SALES ENGINEER CAN HELP DETERMINE THE PROPER LIFT
THICKNESS.
CONSTRUCTION LOADING
TYPICALLY, THE MINIMUM COVER SPECIFIED FOR A PROJECT ASSUMES H-20
LIVE LOAD. BECAUSE CONSTRUCTION LOADS OFTEN EXCEED DESIGN LIVE
LOADS, INCREASED TEMPORARY MINIMUM COVER REQUIREMENTS ARE
NECESSARY. SINCE CONSTRUCTION EQUIPMENT VARIES FROM JOB TO JOB,
IT IS BEST TO ADDRESS EQUIPMENT SPECIFIC MINIMUM COVER
REQUIREMENTS WITH YOUR LOCAL CONTECH SALES ENGINEER DURING
YOUR PRE-CONSTRUCTION MEETING.
ADDITIONAL CONSIDERATIONS
BECAUSE MOST SYSTEMS ARE CONSTRUCTED BELOW-GRADE, RAINFALL
CAN RAPIDLY FILL THE EXCAVATION; POTENTIALLY CAUSING FLOATATION
AND MOVEMENT OF THE PREVIOUSLY PLACED PIPES. TO HELP MITIGATE
POTENTIAL PROBLEMS, IT IS BEST TO START THE INSTALLATION AT THE
DOWNSTREAM END WITH THE OUTLET ALREADY CONSTRUCTED TO ALLOW
A ROUTE FOR THE WATER TO ESCAPE. TEMPORARY DIVERSION MEASURES
MAY BE REQUIRED FOR HIGH FLOWS DUE TO THE RESTRICTED NATURE OF
THE OUTLET PIPE.
1 2 3 4 5
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1514131211
GEOGRID WASN'T USED
GEOGRID
UNDERCUT AND REPLACE
UNSUITABLE SOILS
EMBANKMENT
GEOGRID USED TO REDUCE
THE AMOUNT OF UNDERCUT
BEDDING
COVER
EMBANKMENTBEDDING - WELL GRADED
GRANULAR AND SMALLER
IN-SITU
TRENCHWALL
1
2" PER FOOT OF
COVER OR 4" MIN.
EMBANKMENT
LIVE LOAD
BEDDING - WELL GRADED
GRANULAR AND SMALLER
BACKFILL - WELL GRADED
3
4" GRANULAR AND SMALLER
GEOTEXTILE SEPARATION
(ABOVE AND BELOW
BEDDING) WITH UNIFORMLY
GRADED BEDDING LAYER.
PIPE A PIPE B PIPE C PIPE D
BEDDING8" LOOSE LIFTS
EMBANKMENT
MAXIMUM UNBALANCE LIMITED
TO 2 LIFTS (APPROX. 16")
EMBANKMENT
TYPICAL BACKFILL SEQUENCE
EMBANKMENT
PAVED PARKING LOT
STAGE POURS AS REQUIRED TO
CONTROL FLOATATION AND PIPE
DISTORTION/DISPLACEMENT
CLSM
WEIGHTED PIPE WITH MOBILE
CONCRETE BARRIERS
(OR OTHER REMOVABLE WEIGHTS)
BACKFILL
CATCH BASIN
INLET
WATER WATER
WATER ELEVATION IN
DETENTION SYSTEM
FINISHED FUNCTIONING SYSTEM
OUTLET CONTROL
CMP DETENTION SYSTEM INSPECTION AND
MAINTENANCE
UNDERGROUND STORMWATER DETENTION AND INFILTRATION SYSTEMS MUST
BE INSPECTED AND MAINTAINED AT REGULAR INTERVALS FOR PURPOSES OF
PERFORMANCE AND LONGEVITY.
INSPECTION
INSPECTION IS THE KEY TO EFFECTIVE MAINTENANCE OF CMP DETENTION
SYSTEMS AND IS EASILY PERFORMED. CONTECH RECOMMENDS ONGOING,
QUARTERLY INSPECTIONS. THE RATE AT WHICH THE SYSTEM COLLECTS
POLLUTANTS WILL DEPEND MORE ON SITE SPECIFIC ACTIVITIES RATHER THAN
THE SIZE OR CONFIGURATION OF THE SYSTEM.
INSPECTIONS SHOULD BE PERFORMED MORE OFTEN IN EQUIPMENT
WASHDOWN AREAS, IN CLIMATES WHERE SANDING AND/OR SALTING
OPERATIONS TAKE PLACE, AND IN OTHER VARIOUS INSTANCES IN WHICH ONE
WOULD EXPECT HIGHER ACCUMULATIONS OF SEDIMENT OR ABRASIVE/
CORROSIVE CONDITIONS. A RECORD OF EACH INSPECTION IS TO BE
MAINTAINED FOR THE LIFE OF THE SYSTEM
MAINTENANCE
CMP DETENTION SYSTEMS SHOULD BE CLEANED WHEN AN INSPECTION
REVEALS ACCUMULATED SEDIMENT OR TRASH IS CLOGGING THE DISCHARGE
ORIFICE.
ACCUMULATED SEDIMENT AND TRASH CAN TYPICALLY BE EVACUATED
THROUGH THE MANHOLE OVER THE OUTLET ORIFICE. IF MAINTENANCE IS NOT
PERFORMED AS RECOMMENDED, SEDIMENT AND TRASH MAY ACCUMULATE IN
FRONT OF THE OUTLET ORIFICE. MANHOLE COVERS SHOULD BE SECURELY
SEATED FOLLOWING CLEANING ACTIVITIES. CONTECH SUGGESTS THAT ALL
SYSTEMS BE DESIGNED WITH AN ACCESS/INSPECTION MANHOLE SITUATED AT
OR NEAR THE INLET AND THE OUTLET ORIFICE. SHOULD IT BE NECESSARY TO
GET INSIDE THE SYSTEM TO PERFORM MAINTENANCE ACTIVITIES, ALL
APPROPRIATE PRECAUTIONS REGARDING CONFINED SPACE ENTRY AND
OSHA REGULATIONS SHOULD BE FOLLOWED.
SYSTEMS ARE TO BE RINSED, INCLUDING ABOVE THE SPRING LINE, ANNUALLY
SOON AFTER THE SPRING THAW, AND AFTER ANY ADDITIONAL USE OF SALTING
AGENTS, AS PART OF THE MAINTENANCE PROGRAM FOR ALL SYSTEMS WHERE
SALTING AGENTS MAY ACCUMULATE INSIDE THE PIPE.
MAINTAINING AN UNDERGROUND DETENTION OR INFILTRATION SYSTEM IS
EASIEST WHEN THERE IS NO FLOW ENTERING THE SYSTEM. FOR THIS
REASON, IT IS A GOOD IDEA TO SCHEDULE THE CLEANOUT DURING DRY
WEATHER.
THE FOREGOING INSPECTION AND MAINTENANCE EFFORTS HELP ENSURE
UNDERGROUND PIPE SYSTEMS USED FOR STORMWATER STORAGE CONTINUE
TO FUNCTION AS INTENDED BY IDENTIFYING RECOMMENDED REGULAR
INSPECTION AND MAINTENANCE PRACTICES. INSPECTION AND MAINTENANCE
RELATED TO THE STRUCTURAL INTEGRITY OF THE PIPE OR THE SOUNDNESS
OF PIPE JOINT CONNECTIONS IS BEYOND THE SCOPE OF THIS GUIDE.
DYODS - 4524-1-0
PROJECT NAME: Alpine Chalet Apartments
Rexburg, ID
DESCRIPTION: OPTION 1
GEOMEMBRANE BARRIER
A SITE'S RESISTIVITY MAY CHANGE OVER TIME WHEN VARIOUS TYPES OF
SALTING AGENTS ARE USED, SUCH AS ROAD SALTS FOR DEICING AGENTS. IF
SALTING AGENTS ARE USED ON OR NEAR THE PROJECT SITE, A GEOMEMBRANE
BARRIER IS RECOMMENDED WITH THE SYSTEM. THE GEOMEMBRANE LINER IS
INTENDED TO HELP PROTECT THE SYSTEM FROM THE POTENTIAL ADVERSE
EFFECTS THAT MAY RESULT FROM THE USE OF SUCH AGENTS INCLUDING
PREMATURE CORROSION AND REDUCED ACTUAL SERVICE LIFE.
THE PROJECT'S ENGINEER OF RECORD IS TO EVALUATE WHETHER SALTING
AGENTS WILL BE USED ON OR NEAR THE PROJECT SITE, AND USE HIS/HER BEST
JUDGEMENT TO DETERMINE IF ANY ADDITIONAL PROTECTIVE MEASURES ARE
REQUIRED. BELOW IS A TYPICAL DETAIL SHOWING THE PLACEMENT OF A
GEOMEMBRANE BARRIER FOR PROJECTS WHERE SALTING AGENTS ARE USED ON
OR NEAR THE PROJECT SITE.
7%'TBD" TYP.TBD" TYP.
LIMITS OF
REQUIRED
BACKFILL
20 MIL PE IMPERMEABLE
LINER OVER TOP OF PIPE
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