STORM SEWERS
PART 1 - GENERAL
1.01 SECTION INCLUDES
A. Storm Sewers.
B. Culverts.
C. Subdrains.
D. Building Footing Drain Sewer Collectors.
E. Building Storm Sewer Service Stubs.
1.02 DESCRIPTION OF WORK
A. Construct storm sewers, culverts, subdrains, and footing drain collectors.
B. Construct storm sewer service and connections.
C. Reference is made to the Iowa Department of Transportation Standard Specifications for Highway and Bridge Construction, series 2001, and all current General Supplemental Specifications and Materials Instructional Memorandum by the term "Iowa DOT Specifications" and/or " Iowa DOT I.M."
1.03 SUBMITTALS
A. Submit under provisions of Division 1.
B. Manufacturer's instructions for installation of pipe and appurtenances.
C. Construction sequence.
D. Catalog cuts, samples, manufacturer's data, and listing of applicable standards for special, unique, or proposed substitute materials if requested by Jurisdictional Engineer.
E. Certification that materials being provided meet the requirements of these specifications or that alternate materials or substitutions have received written approval of the Jurisdictional Engineer.
F. Project Record Documents.
G. Upon requests the Contractor will provide Material Certifications to the Jurisdictional Engineer.
1.04 SUBSTITUTIONS
A. Use only materials conforming to these specifications unless permitted otherwise by Jurisdictional Engineer.
B. Obtain written approval of Jurisdictional Engineer for all substitutions prior to use.
1.05 DELIVERY, STORAGE, AND HANDLING
A. Deliver only materials that fully conform to these specifications or for which submittals have been provided to Jurisdictional Engineer and approved for use.
B. Store materials and handle to avoid damage. Replace any damaged materials. Remove damaged materials from site.
1.06 SCHEDULING AND CONFLICTS
A. Construction Sequence:
1. Attend a preconstruction meeting if required by Jurisdictional Engineer.
2. Submit plan for construction sequence and schedule prior to commencing construction.
B. Conflict Avoidance:
1. Expose potential conflicts such as utility lines and drainage structures in advance of construction. Verify elevations and locations, and verify clearance for proposed construction.
2. Complete elements of work that can affect line and grade in advance of storm sewer construction unless noted on plans.
3. Notify Jurisdictional Engineer of conflicts discovered or changes needed to accommodate unknown conditions.
1.07 SPECIAL REQUIREMENTS
A. Stop Work: Stop work and notify Jurisdictional Engineer immediately if contaminated soils, historical artifacts or other environmental or historic items are encountered.
B. Conform to local, state, and federal requirements.
1.08 MEASUREMENT FOR PAYMENT
All measurements for payments will be made by the Jurisdictional Engineer or authorized representative.
A. Storm Sewers
andSubdrains, and Culverts:1. Measurement of pipe, except aprons, will be in linear feet along centerline of pipe in place.
2. Measurement of each size and type of pipe installed will be from end of pipe to end of pipe.
3. Payment will be made at the unit bid price for each size and type installed.
4. For pipe installed within casing pipe (Section 3020, 1.08), measurement of the length of casing/carrier pipe properly installed will be along the centerline of the casing. Payment will be made for both carrier and casing pipe as a single bid unit for the appropriate method of installation.
B. Footing Drain Collectors:
The footing drain collector extends from the storm sewer and provides an outlet for storm sewer services and for footing drains. Terminate the upstream end of the footing drain collector at a manhole or cleanout.
1. Measurement of pipe will be in linear feet along centerline of pipe in place.
2. Measurement of each size and type of pipe installed will be from end of pipe to end of pipe.
3. Payment will be made at the unit bid prices for each size and type installed.
4. Wye, tap, and fittings are incidental.
5. Count the number of cleanouts. Payment for cleanouts will be made at the unit bid price for each size and type installed.
C. Storm Sewer Service Stub: The storm sewer service stub is the portion on the storm sewer service from the footing drain collector or storm sewer to a point 10 feet outside of the right-of-way or as shown on the plans.
1. Measurement of pipe will be in linear feet along centerline of pipe in place.
2. Measurement of each size and type of pipe installed will be from centerline of storm sewer or footing drain collector to the end of the pipe.
3. Payment will be made at the unit bid prices for each size and type installed.
4. Tap and fittings are incidental.
D. Pipe Aprons:
1. Payment will be made for each size and type of pipe apron installed.
2. When required, footings for RCP aprons, curtain walls for metal aprons, and apron guards will be paid by each.
E. Incidental Items:
1. Items that are not listed as specific bid items, but are required for proper completion of the work, are incidental to construction. Pipe testing required in Section 4040 is incidental.
2. Incidental items may or may not be shown on plans.
3. No payment shall be made for incidental items.
PART 2 - PRODUCTS
2.01 STORM SEWERS
A. Reinforced Concrete Pipe (RCP):
1. Conform to ASTM C 76.
2. Minimum Class III, Wall B.
3. Tongue and groove joints.
a. Use cold applied bituminous or rubber rope gasket jointing materials, unless otherwise specified.
b. If specified, use rubber O-ring or profile gasket conforming to ASTM C 443.
4. If specified, wrap exterior of each joint with engineering fabric.
B. Reinforced Concrete Arch Pipe (RCAP):
1. Use only where indicated on plans or approved by Jurisdictional Engineer.
2. Conform to ASTM C 506.
3. Minimum Class A III.
4. Tongue and groove joints. Use cold applied bituminous or rubber rope gasket jointing materials, unless otherwise specified.
5. If specified, wrap exterior of each joint with engineering fabric.
C. Reinforced Concrete Elliptical Pipe (RCEP):
1. Use only where indicated on plans or approved by Jurisdictional Engineer.
2. Conform to ASTM C 507.
3. Minimum Class HE III or Class VE III
4. Tongue and groove joints. Use cold applied bituminous or rubber rope gasket jointing materials, unless otherwise specified.
5. If specified, wrap exterior of each joint with engineering fabric.
D. Reinforced Concrete Low Head Pressure Pipe (RCPP):
1. Conform to ASTM C 361.
2. Minimum Class C 25.
3. Tongue and groove joints.
4. Conform to ASTM C 361 for rubber O-rings or profile gaskets.
E. Polyvinyl Chloride Pipe (PVC):
1. Use pipe conforming to the following:
a. Types of PVC pipes:
1) Corrugated exterior, smooth interior, ASTM F 949b. PVC plastic meeting ASTM D 1784, Cell Classification 12454. Do not exceed 10 parts by weight per 100 of PVC resin in the compound for additives and fillers, including but not limited to stabilizers, antioxidants, lubricants, colorants, etc.
2) Solid wall, ASTM D 3034 or ASTM F 679
3) Closed profile, ASTM F 1803
4) Truss, ASTM D 2680
c. Minimum pipe stiffness of 46 psi.
d. Gasketed integral bell and spigot joints per ASTM D 3212 and ASTM F 477.2. Do not use in right-of-way.
3. Use only outside of right-of-way in public utility easement areas where no utilities exist or are proposed (running parallel or crossing) or where the trench for the PVC pipe will not be disturbed, and where the Jurisdictional Engineer allows
F. High Density Polyethylene Pipe (HDPE):
1. Use pipe conforming to the following:
a. AASHTO M 294, Type S corrugated exterior and smooth interior.
b. ASTM D 3350 minimum resin Cell Classification 335420 C.
c. Minimum pipe stiffness at 5% deflection per ASTM D 2412.
d. Integral bell and spigot joints with O-ring rubber gasket meeting ASTM F 477.
e. Maximum 5% deflection of the average inside diameter by testing after installation per Section 4040, 3.09.2. Do not use in right-of-way.
3. Use only outside of right-of-way in public utility easement areas where no utilities exist or are proposed (running parallel or crossing) or where the trench for the HDPE pipe will not be disturbed, and where the Jurisdictional Engineer allows.
G. Metal Pipes:
1. Use pipe conforming to Section 4020, 2.02.
2. Do not use in right-of-way.
3. Use only outside of right-of-way in public easement areas where no utilities exist or are proposed (running parallel or crossing) or where the trench for the metal pipe will not be disturbed, and where the Jurisdictional Engineer allows.
H. Jointing Material for Concrete Pipe:
1. Bituminous jointing material: Use a cold applied mastic sewer joint sealing compound recommended by the manufacturer for the intended use and approved by the Jurisdictional Engineer. Conform to AASHTO M 198.
2. Rubber rope gasket jointing material: Conform to ASTM C 990.
3. Rubber O-ring or profile gasket: Conform to ASTM C 443 (for RCP) or ASTM C 361 (for RCPP).
I. Bituminous Joint Primer: Meet the requirements of ASTM D 41, which is intended for use in priming concrete pipe joints prior to application of bituminous jointing material.
J. Engineering Fabric:
1. Use for wrapping exterior of storm sewer pipe joints where indicated on plans.
2. Use Iowa DOT 4196.01B fabric for subsurface drains.
K. Pipe Apron Section:
1. Use where indicated on plans.
2. Reinforced concrete apron sections conforming to Figure 4020.9.
3. Metal pipe aprons conforming to Figure 4020.10.
4. Minimum Class III.
L. Apron Guard:
1. Use where indicated on plans.
2. See Figure 4020.3.
2.02 CULVERTS
Use the following pipe materials for culverts where indicated on plans or approved by the Jurisdictional Engineer.
A. Pipe materials as specified for storm sewers.
B. Corrugated Metal Pipe (CMP):
1. Conform to AASHTO M 36, Type I.
2. Zinc coating: Conform to AASHTO M 218.
3. Corrugated steel circular section with annular (circumferential) or helical corrugations.
4. Minimum thickness: Gauge of pipe conforming to Iowa DOT Standard Road Plan RF-32 and RF-33or as indicated on the plans.
5. Coupling bands: Annular corrugations or helical corrugations to match pipe ends.
C. Spiral Rib Pipe:
1. Conform to ASTM A 760 Type 1R.
2. Use a corrugation profile of 3/4 inch by 3/4 inch by 7-1/2 inches.
3. Aluminized steel Type 2: Conform to ASTM A 929.
4. Use a minimum thickness of 0.064 inch: Gage of pipe conforming to manufacturer's requirements or as shown on plans.
5. Coupling bands conforming to manufacturer's recommendations.
D. Corrugated Metal Arch Pipe (CMAP):
1. Conform to AASHTO M 36, Type II.
2. Zinc coating: Conform to AASHTO M 218.
3. Corrugated steel Type I pipe reformed into a pipe-arch having an approximately flat bottom.
4. Coupling bands: Annular corrugations or helical corrugations to match pipe ends.
5. Minimum thickness: Gage of pipe to conforming to Iowa DOT Standard Road Plan RF-33.
E. Spiral Rib Pipe Arch:
1. Conform to ASTM A 760 Type IIR.
2. Corrugation profile to be 3/4 inch x 3/4 inch x 7-1/2 inch.
3. Aluminized steel Type 2: Conform to ASTM A 929.
4. Use a minimum thickness 0.064 inch: Gage of pipe shall conforming to manufacturer's requirements or as shown on plans.
5. Coupling bands shall conforming to the manufacturer's recommendations.
F. Structural Plates:
1. Use a galvanized steel structural plate shall conforming to AASHTO M 167.
2. Use bolts and nuts meeting ASTM A 449 and galvanized per ASTM A 153, Class C.
3. Assemble the structure according to the shop drawings provided by the manufacturer and per the manufacturer's recommendations. Tighten the bolts using an applied torque of between 100 and 300 foot-pounds.
4. Install the structure according to the plans and specifications, the manufacturer's recommendations, and AASHTO Standard Specifications for Highway Bridges, Division II Section 26.
5. Conform the gage of the structure to Iowa DOT Standard Road Plan RF-33 or as indicated on the plans.
G. Coated Corrugated Metal Pipe:
1. Use in corrosive soil or effluent conditions or where indicated on plans or required by Jurisdictional Engineer.
2. Conform to AASHTO M 274 [steel sheet, aluminum-coated (Type 2)], minimum thickness per Section 4020, 2.02 B.
H. Aluminum Structural Plate
1. Conform to AASHTO M 219
2. Use a corrugation profile of 9 inches by 2-1/2 inches.
3. Aluminum: Conform to ASTM B 209.
4. Use a minimum thickness of 0.100 inch: Gage of structure conforming to manufacturer's requirements or as shown on the plans.
5. Use bolts and nuts meeting ASTM A 307 or ASTM A 449 and galvaniz per ASTM A 153
6. Assemble the structure according to the shop drawings provided by the manufacturer and per the manufacturer’s recommendations. Tighten the bolts using an applied torque of between 100 and 300 foot-pounds.
7. Install the structure according to the plans and specifications, the manufacturer’s recommendations, and AASHTO Standard Specifications for Highway Bridges, Division III, Section 26.
8. Meet or exceed the AASHTO Standard Specifications for Highway Bridges, Section 12.8 for HS 20 loading.
I. Pipe Aprons and Beveled Ends:
Use where indicated on plans.1. Use where indicated on plans.
2. Conform to Section 4020, 2.01.
2.03 SUBDRAINS, TYPES I (See Figure 4020.5A)
A. Polyvinyl Chloride Pipe and Fittings (Solid Wall PVC):
1. Conform to ASTM D 3034, minimum thickness SDR 35, 46 psi minimum pipe stiffness.
2. PVC plastic according to ASTM D 1784, Cell Classification 12454.
3. Integral bell and spigot type rubber gasket joint conforming to ASTM D 3212 and ASTM F 477.
4. Fabricated or preformed saddle wye or saddle tee for service tap conforming to AASHTO M 252 or M 294.
5. Slot subdrain pipe according to ASTM F 949 or perforate with four rows of 1/4 inch to 3/8 inch diameter holes along the bottom of the pipe.
B. Polyvinyl Chloride Corrugated Pipe and Fittings (Corrugated PVC):
1. Corrugated exterior, smooth interior, PVC.
2. Conform to ASTM F 949, minimum pipe stiffness, 46 psi.
3. PVC plastic according to ASTM D 1784, Cell Classification 12454.
4. Integral bell and spigot type rubber gasket joint conforming to ASTM D 3212 and ASTM F 477.
5. Slot subdrain pipe according to ASTM F 949.
C. Polyethylene Corrugated Tubing (Corrugated PE):
1. Conform to AASHTO M 252, Type C, corrugated interior and exterior or Type S, corrugated exterior, smooth interior.
2. Use only fittings supplied or recommended by pipe manufacturer for soil tight service.
3. Slotted or perforated, if required, conforming to AASHTO M 252, Type CP, or Type SP.
D. CMP Subdrain Outlet:
1. Use CMP at outlets or connections to intakes or other drainage facilities where specified.
2. Conform to AASHTO M 36, Type 1.
3. Zinc coating: Conform to AASHTO M 218.
4. Corrugated steel circular section with annular (circumferential) or helical corrugation.
5. Minimum thickness: 0.052 inch.
6. Coupling bands: Annular corrugations or helical corrugations to match pipe ends.
E. Engineering Fabric: Use fabric conforming to Iowa DOT 4196.01B.
2.04 FOOTING DRAIN COLLECTOR (Minimum 8 inch, maximum 12-inch diameter)
The following requirements also apply to Type II Subdrains (see Figure 4020.5B).
A. PVC Pipe:
1. Conform to ASTM D 3034, minimum thickness SDR 35, minimum pipe stiffness 46 psi.
2. PVC plastic according to ASTM D 1784, Cell Classification 12454.
3. Integral bell and spigot type rubber gasket joint conforming to ASTM D 3212 and ASTM F 477.
4. Preformed wye or tee service fitting with gasket joints conforming to ASTM D 3034.
5. Preformed saddle wye or saddle tee for service tap conforming to ASTM D 3034.
6. For Type II Subdrain, slot pipe according to ASTM F 949 or perforate with four rows of 1/4 inch to 3/8 inch diameter holes along the bottom of the pipe.
B. Corrugated PVC Pipe:
1. Corrugated exterior, smooth interior PVC.
2. Conform to ASTM F 949, minimum pipe stiffness 46 psi.
3. PVC plastic according to ASTM D 1784, Cell Classification 12454.
4. Integral bell and spigot type rubber gasket joint conforming to ASTM D 3212 and ASTM F 477.
5. Preformed wye or tee service fitting with gasket joints conforming to ASTM F 949.
6. Preformed saddle wye or saddle tee for service tap conforming to ASTM F 949.
7. For Type II Subdrain, slot pipe according to ASTM F 949.
C. HDPE Pipe:
1. Use pipe conforming to the following:
a. AASHTO M 294, Type S corrugated exterior and smooth interior.
b. ASTM D 3350, minimum resin Cell Classification 335420 C.
c. Minimum pipe stiffness at 5% deflection per ASTM D 2412.
d. Integral bell and spigot joints with O-ring rubber gasket meeting ASTM F 477.
e. Maximum 5% deflection of the average inside diameter by testing after installation per Section 4040, 3.09.2. Fabricated or preformed saddle wye or saddle tee for service tap shall conform to AASHTO M 252 or M 294.
3. For Type II Subrain, slot or perforate according to AASHTO M 252, Type CP, or Type SP.
D. RCP
1. Conform to Section 4020, 2.01.
2. If specified for Type II Subdrain, wrap exterior of each joint with engineering fabric and use no joint sealant.
E. Engineering Fabric: Conform to Iowa DOT 4196.01B.
2.05 STORM SEWER SERVICE STUBS (Minimum 4 inch diameter)
A. Pipe materials as specified for footing drain collectors may be used for storm sewer services.
B. PVC Pipe:
1. Conform to ASTM D 3034, pipe stiffness per ASTM D 2412, minimum thickness solid wall pipe SDR 23.5 (153 psi), 26 (115 psi), 35 (46 psi).
2. PVC plastic meeting ASTM D 1784, Cell Classification 12454. Do not exceed 10 parts by weight per 100 of PVC resin in the compound for additives and fillers, including but not limited tio stabilizers, antioxidants, lubricants, colorants, etc.
3. Integral bell and spigot type rubber gasket joint conforming to ASTM D 3212 and ASTM F 477.
PART 3 - EXECUTION
3.01 EXAMINATION
A. Verify measurements at site; make necessary field measurements to accurately determine pipe makeup lengths or closures.
B. Examine site conditions to ensure construction operations do not pose hazards to adjacent structures or facilities.
3.02 LINE AND GRADE
A. Install pipe to line and grade shown on plans. Set field grades to invert of pipes or culverts.
B. Notify Jurisdictional Engineer immediately if discrepancies or irregularities are discovered in line or grade shown by grade stakes.
C. Make detailed measurements as required to construct work to line and grade established by line and grade hubs.
D. Batter Boards:
1. Set grade points at intervals of 25 feet at convenient offset from centerline of pipe or culvert.
2. Set batter boards as necessary to construct to design line and grade.
3. Provide at least three batter boards at all pipe laying areas during construction as check on accuracy of grades.
4. Check line and grade of each pipe length with grade rod and plumb bob.
E. Laser Beam:
1. Set laser equipment to proper line and grade from line and grade hubs.
2. Check line and grade of laser at intervals of 25 feet for first 100 feet and then at intervals of 50 feet for each setup.
3. Check line and grade of each pipe length.
F. Correct Misalignment: Correct misalignment, displacement, or otherwise defective pipe by removing, relaying, or replacing pipe at Contractor's expense.
3.03 PIPE INSTALLATION
A. Provide trench excavation, pipe bedding, and backfill as specified in Section 3010.
B. Provide proper facilities shall be provided for lowering the sections into place without damaging the pipe.
C. Begin at lowest point in line. Lay groove or bell end point upstream unless specifically noted otherwise.
D. Prepare trench bottom to design line and grade so only minor movement of pipe is necessary after installation.
E. Inspect pipe for defects before carefully lowering into trench. Do not install damaged or defective pipe.
F. Clean pipe interior and joints prior to lowering into trench. Keep pipe clean during construction.
G. Do not lay pipe in water or on saturated soil or bedding. Do not allow water to rise in trench around pipe.
H. Place pipe with lifitng holes at the top of the pipe and fill lift holes with non-shrink grout of manufactured plugs.
I. Lay pipe to design line and grade.
J. Provide uniform bearing for full pipe barrel length.
1. Excavate bell holes as necessary for uniform support of pipe barrel on bedding material.
2. Do not block pipe above bedding.
K. Assemble joints as specified.
L. Protect exposed upstream ends of pipe to prevent soil sediment from entering storm sewer system with the watertight stopper, cap, or plug.
M. Do not disturb installed pipe and bedding when using movable trench boxes and shields. Block or anchor pipe as necessary to prevent joint displacement.
N. Saw cut ends of pipe at manholes, intakes, and structures. Do not hammer cut or break pipe.
O. Provide manholes and intakes where indicated on plans and as specified in Sections 6010 and 6020.
3.04 PIPE JOINTING
A. Joint Cleaning: Clean joint surfaces with wire brush to remove soil or foreign material prior to jointing pipe.
B. Assemble Joints According to Pipe Manufacturer's Recommendations:
1. Use equipment that does not apply damaging forces to pipe joints.
2. Use bar and block or internal or external jointing devices or other methods recommended by pipe manufacturers.
C. RCP, RCAP, and RACEP:
1. Use cold applied bituminous or rubber rope gasket jointing materials unless otherwise specified.
a. Apply joint material to entire tongue or to top half of tongue and bottom half of groove, in sufficient quantity to fill joint; close joint between pipes.
b. Fill remaining voids in joint both inside and outside of pipe with joint material; smooth joint material on inside of pipe 24 inches and larger.2. If rubber O ring or profile gasket is specified for RCP, coat rubber ring gasket and joint with soap based lubricant immediately prior to closing joint.
3. If wrapped pipe joint is specified, see Figure 4020.1A.
a. Secure engineering fabric in place to prevent displacement during backfill operations.
b. For combination storm sewer/subdrain or Type II subdrain, do not use joint sealant.4. Joint openings on the outside or inside of the pipe that do not exceed 1/8 inch at the bottom and 5/8 inch at the top are acceptable.
5. Fully encase large joint openings, unless required for camber, with a Type II concrete collar (see Figure 4020.1A). Use Class C structural concrete.
D. RCPP: Coat rubber ring gasket and joint with soap based lubricant immediately prior to closing joint.
E. CMP and CMAP:
1. Install coupling bands that match ends of pipes.
2. End of coupling bands must lap or be fabricated to form tightly closed joint upon installation.
F. PVC Pipe and Corrugated PVC: Coat rubber gasket and joint with soap based lubricant immediately prior to closing joint.
G. HDPE: Coat rubber gasket and joint with soap based lubricant immediately prior to closing joint.
H. Connections Between Dissimilar Pipes:
1. Use manufactured adapters or couplings approved by Jurisdictional Engineer.
2. Where adapters or couplings are not available, Jurisdictional Engineer may authorize use of concrete collar as shown in Figure 4020.1A.
3.05 PIPE END SECTIONS
A. Install reinforced concrete pipe aprons where indicated on plans. Install apron footings according to Figure 4020.2 when specified.
B. Install metal pipe aprons where indicated on plans. Install curtain walls when specified.
C. Anchor last three pipe sections and aprons together with two pipe connections per joint. See Figure 4020.1B.
D. Install apron guard where indicated on plans. See Figure 4020.3 for details.
3.06 SUBDRAINS AND TRENCH DRAINS
A. Provide Type I subdrain where indicated on plans. See Figure 4020.5A.
B. Provide trench drains where indicated on plans. See Figure 4020.7.
C. If specified, install engineering fabric.
3.07 FOOTING DRAIN COLLECTOR
A. Install footing drain collector per Section 3010. Install Type II, combination subdrain/footing drain collector per Figure 4020.5B.
B. If specified, install engineering fabric.
C. Provide cleanouts and connections per Figure 4020.6.
1. Connect footing drain sewer collectors to storm sewer manhole or intake.
2. Provide fabricated or preformed wye or tee service fitting for each platted lot or building.
D. Provide manholes, if specified, according to Section 6020.
3.08 STORM SEWER SERVICE STUBS
A. Provide storm sewer service connection and line from storm sewer or footing drain sewer for each platted lot or building as shown on plans.
B. Use fabricated or preformed saddle wye or saddle tee for service tap to storm sewers. Clamp with two stainless steel clamps and install according to the manufacturer's recommendations.
C. Extend storm sewer service from storm sewer or footing drain collector to 10 feet outside of the right-of-way line or as shown on the plans.
D. Place watertight stopper or plug in end of storm sewer service.A. Provide storm sewer service connections and line from storm sewer mains or footing drain sewer mains for each platted lot or building at locations shown on plans.
B. For new sewer main construction, except RCP sewers, install wye or tee fittings according to the manufacturer's requirements.
C. For existing sewers and all RCP sewers, saw or drill a neat hole in sewer main and install preformed saddle wyes or tees according to the manufacturer's requirements.
D. For undeveloped properties, extend the storm sewer service from the storm sewer or footing drain collector to a point 10 feet outside of the right-of-way or as shown on the plans. Place a watertight stopper or plug in the end of the storm sewer service.
E. For reconnection of existing service pipe to new sewer pipe, use a manufactured flexible connection.
3.09 TOLERANCES
A. Horizontal and vertical alignment of gravity sewer lines shall not vary from design line and grade at any point along the pipe by more than 1% of the inside diameter of the pipe or 1/4 inch, whichever is larger.
B. Tolerance allowed only if design line and grade is sufficient to prevent backslope when tolerance limits are reached.
C. Reverse slope on pipe is prohibited.
3.10 CONFLICTS
A. Provide temporary support for existing water, gas, telephone, power, and other utilities or services that cross trench.
B. Compact backfill under existing utility crossing as specified in Section 3010 or construct utility line supports where indicated on plans or as directed by Jurisdictional Engineer.
3.11 STORM SEWER ABANDONMENT
When sewers are to be abandoned, standard sewer plugs shall be placed in accordance with the Figure 4010.2. Prior to placing the plug, ensure the line is not in use. If noted on the plans, fill the line with gravity flow or pump the line full of flowable mortar or controlled low strength material (see Section 3010).
END OF SECTION