B09_Amd_4_Attach_1_33_40_00_-_Storm_Drainage_0004.pdf

MORA 313019 / 331809 / 312439 33 40 00 - 1

STORM DRAINAGE

SECTION 33 40 00 – STORM DRAINAGE

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary

Conditions and Division 1 Specification Sections, apply to this Section.

1.2 SUMMARY

A. This Section includes the following:

1. Installation of storm drain and associated outfall protection.

2. Installation of trench drain.

B. Related Sections:

1. Section 01 57 23 – Temporary Stormwater Pollution Prevention

2. Section 31 20 00 – Earth Moving

1.3 SUBMITTALS

A. Product Data: For storm drain pipe, trench drain, and outfall protection material.

B. Manufacturer’s Certification: Products meet or exceed specifications.

PART 2 - PRODUCTS

2.1 PIPE

A. Storm drain pipe shall be lined corrugated polyethylene pipe and shall meet the requirements of

AASHTO M 294 Type S or D.

B. Corrugated polyethylene storm sewer pipe manufacturers shall participate in the National

Transportation Product Evaluation Program (NTPEP) work plan for HDPE (High Density

Polyethylene) Thermoplastic Pipe and be listed on the NTPEP audit website displaying they are

NTPEP compliant.

C. Corrugated polyethylene couplings and fittings shall meet the requirements of AASHTO M 294

Type S or D.

D. All joints for corrugated polyethylene storm sewer pipe shall be made with a bell/bell or bell and spigot coupling and shall conform to ASTM D3212 using elastomeric gaskets conforming to

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ASTM F477. All gaskets shall be factory installed on the pipe in accordance with the manufacturer’s recommendations.

2.2 BEDDING MATERIALS

A. Bedding: As specified in Section 31 20 00.

2.3 OUTFALL PROTECTION MATERIAL

A. Rock for rock slope protection at culvert pipe outlets must be small-rock slope protection and must comply with the gradation shown below:

Sieve Size Percentage Passing

5 inch 100

4 inch 90 – 100

3 inch 25 – 40

2 inch 0 – 10

2.4 TRENCH DRAIN

A. Channels

1. Trench drain channel shall be manufactured from polyester resin polymer concrete with integrally cast-in stainless steel edge rails. Polymer concrete shall be conform to the following:

Compressive Strength: 98 MPa

Flexural Strength 26 MPa

Tensile Strength 14 MPa

Water Absorption 0.07%

Frost Proof YES

Coefficient of Expansion/Contraction 2.02x10-5/°C

Water Vapor Transmission 0.0364 g/m2

Non-Flammable YES

Manning’s Roughness, n 0.011

Resistant to Weathering YES

Dilute Acid and Alkali Resistant YES

SF Sealant Groove YES

2. Channels shall be 4 inches nominal interior width with an overall width of 6 inches.

3. Channel invert shall have a U-profile to allow efficient drainage. Sloped channels shall have a built-in slope of 0.5%.

4. All channels shall be interlocking with a male/female joint.

B. Grates

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1. Grates shall be manufactured from ductile iron to ASTM A 536-84 - Grade 65-45-12.

2. Grate shall have an overall width of 6 inches.

3. Grate shall have maximum slot widths of ½”.

C. Concrete: Concrete shall have a minimum strength of 4000 psi.

PART 3 - EXECUTION

3.1 EXCAVATING

A. See Section 31 20 00.

3.2 INSTALLATION – PIPE

A. Verify that trench cut is ready to receive work and excavations, dimensions, and elevations are as indicated on layout drawings. Trenches must be of sufficient width in the pipe zone to permit proper installation and bedding of the pipe and to provide the required compaction of backfill.

B. Install pipe and accessories in accordance with manufacturer’s instructions.

C. Lift or roll pipe into position. Do not drop or drag pipe over prepared bedding.

D. All boulders and stones shall be removed to provide a minimum of 6 inches clearance under all portions of the pipe.

E. Placement of bedding material shall precede the installation of all pipe. This shall include necessary leveling of the native trench bottom or the top of the foundation material as well as placement and compaction of required bedding material to a uniform grade so that the entire length of pipe will be supported on a uniformly dense unyielding foundation.

F. Pipe zone bedding material shall provide uniform support along the entire pipe barrel, without load concentration at joint collars or bells. All adjustment to line and grade shall be made by scraping away or filling in with bedding material under the body of the pipe and not by blocking or wedging. Bedding disturbed by pipe movement, or by removal of shoring movement of a trench shield or box, shall be reconsolidated prior to backfill.

G. Pipe zone bedding shall be placed in loose layers and compacted to 90 percent maximum density.

Bedding shall be placed, spread, and compacted before the pipe is installed so that the pipe is uniformly supported along the barrel. Lifts of not more than 6 inches in thickness shall be placed and compacted along the sides of the pipe. Material shall be worked carefully under the pipe haunches and then compacted.

H. If the CO determines that the material existing in the bottom of the trench is satisfactory for bedding the pipe, the bedding material specified is not required, provided the existing material is loosened, regraded, and compacted to form a dense, unyielding base.

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I. Before lowering and while suspended, inspect pipe and each fitting for defects. Installation of defective material is not permitted.

J. Where pipe, fittings or joint materials have been soiled by earth in handling, thoroughly clean soiled surfaces by wire brushing and wiping until all traces of earth are removed before joining pipe.

K. Maintain interior of all pipes thoroughly clean. After each line of pipe has been laid, carefully inspect, identify and remove dirt, trash, rags and other foreign matter from interior. Protect completed work.

L. Install pipe, fittings, and accessories at the locations indicated on layout drawings and in accordance with manufacturer’s instructions. Seal watertight.

M. Trenches shall be backfilled as soon after the pipe laying as possible.

N. Pipe zone backfill material shall be clean earth or sand, free from clay, frozen lumps, roots, or moisture in excess of that permitting required compaction. Rocks or lumps larger than 3 inches maximum shall not be used for pipe zone backfill.

O. Pipe zone backfill shall be placed in loose layers and compacted to 90 percent maximum density.

Backfill shall be brought up simultaneously on each side of the pipe to the top of the pipe zone.

The pipe shall then be covered to the top of the pipe zone and the materials compacted in a manner to avoid damaging or disturbing the completed pipe.

P. Backfill above the pipe zone shall be accomplished in such a manner that the pipe will not be shifted out of position nor damaged by impact or overloading. If pipe is being placed under existing paved areas, or Roadways, backfill above the pipe zone shall be placed in horizontal layers no more than 6 inches thick and compacted to 95 percent maximum density. If pipe is being placed in non-traffic areas, backfill above the pipe zone shall be placed in horizontal layers no more than 6 inches thick and shall be compacted to 85 percent maximum density.

Q. Appurtenances

1. All appurtenances (tees, elbows, etc.), must be independently supported and shall not rely on the pipeline and its connections for this support. Excessive stresses may be encountered when appurtenances are inadequately supported.

R. Protection

1. Water is not permitted to run or stand in trench while pipe laying is in progress, before the joints are completely set, or before trench has been backfilled.

2. Protect pipe and bedding cover from damage or displacement until backfilling operation is in progress.

3.3 PIPE ENDS

A. Place fill at pipe ends, at embankment slopes.

B. Bevel pipe end to match adjacent slope.

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3.4 TOLERANCES

A. Lay pipe to alignment and slope gradients noted on layout drawings; with maximum variation from true slope of 1/8 inch in 10 feet.

B. Maximum Variation From Intended Elevation of Culvert Invert: 1/2 inch.

C. Maximum Offset of Pipe From True Alignment: 1 inch.

D. Maximum Variation in Profile of Structure From Intended Position: 1 percent.

3.5 TRENCH DRAIN INSTALLATION

A. Ensure ground conditions are compacted and suitable for construction.

B. Excavate trenches to sufficient dimensions to permit proper installation of stabilizing concrete and trench drain.

C. Concrete shall be placed to encase trench drain as shown in the Plans.

D. Install trench drain in accordance with manufacturer’s instructions. The drain shall be finished

1/8 inch below finish grade while ensuring positive drainage of adjacent areas toward the drain.

E. The existing trench drain shall be cleaned of all debris.

3.6 PROTECTION

A. Protect pipe and bedding from damage or displacement until backfilling operation is in progress.

END OF SECTION 33 40 00