3.8 Materials

1) Unless otherwise approved by the City Engineer, materials shall conform to the minimum requirements outlined herein and as shown on the Standard Details. This listing is not intended to be complete nor designed to replace the City's Public Works Design Standards (PWDS).

2) Acceptable materials shall be as outlined in these Design Standards in Appendix A.

3) It is not intended that materials listed herein are to be considered acceptable for all applications. The design engineer shall determine the materials suitable for the project.

b. Pipe Type By Cover Depth:

Unless otherwise approved by the City Engineer, storm drain pipe materials shall conform to the table below. Uniform pipe material shall be used on each pipe run between structures. Special requirements for use of jointed HDPE pipe for slopes exceeding 6% is listed in the following table.

Allowable Storm Drainage Pipe Based on Cover Depth
COVER DEPTH (from finish grade)	10" -18" DIAMETER
Less than 1½' Cover	Class 50 Ductile iron pipe with bell & spigot joints and rubber gaskets.
1½' to 2½' Cover	Pipe specified for lesser depths -OR- Class 3, ASTM C-14 non-reinforced concrete pipe with bell & spigot joints and rubber gaskets. -OR- PVC pipe conforming to AWWA C900 DR 18 (6"-12") or AWWA C-905 (14"-18") with bell and spigot joints and rubber gasket.
2½' to 10' Cover	Pipe specified for lesser depths -OR- PVC pipe conforming to ASTM D-3034 solid wall PVC SDR 35 (6"-15") or ASTM F-679 PVC solid wall SDR 35 (18") with bell and spigot joints and rubber gasket-OR- HDPE (High Density Polyethylene) pipe conforming to AASRTO M-252 (8"-10") or AASRTO M-294 (12"- 18"). For slopes less than 6% the pipe shall be ADS N-121B ST, Rancor Sure-Lok F477, or approved equal. For slopes greater than 6% the pipe shall be ADS N-12 1B WT, Rancor Blue Seal, or approved equal with watertight pressure testable fittings.
More than 10' Cover	Case by case basis.
COVER DEPTH (from finish grade)	21" - 30" DIAMETER
Less than 1½' Cover	Class 50 Ductile iron pipe with bell & spigot joints and rubber gaskets.
1½' to 2½' Cover	Pipe specified for lesser depths -OR- Class IV (minimum), ASTM C-76 reinforced concrete pipe with bell & spigot joints and rubber gaskets -OR- PVC pipe conforming to AWWA C900 DR 18 (6"-12") or AWWA C-905 (14"-18") with bell and spigot joints and rubber gasket.
2½' to 10' Cover	Pipe specified for lesser depths -OR- ASTM F-679 PVC solid wall SDR 35 pipe with bell and spigot joints and rubber gasket -OR- HDPE (High Density Polyethylene) pipe conforming to AASRTO M-294. For slopes less than 6% the pipe shall be ADS N-12 1B ST, Rancor Sure-Lok F477, or approved equal. For slopes greater than 6% the pipe shall be ADS N-121B WT, Rancor Blue Seal, or approved equal with watertight pressure testable fittings.
More than 10' Cover	Case by case basis.
GREATER THAN 30" DIAMETER, OTHER PIPE MATERIALS - Case by case basis.
Driveway Culverts: Pipe type based on cover depth, minimum size 12-inch diameter or adjacent street crossing or storm drain size, whichever is greater. PVC or HDPE pipe not allowed for culverts of outfalls without structural concrete end caps. Detention Systems. Piping associated with detention systems (i.e. including detention pipe where applicable, piping between the detention basin & the flow control manhole, overflow piping, etc.) shall conform with the minimum requirements of this table. This pipe material table also does not apply to other private storm piping which fully complies with the material and slope requirements of the Oregon Plumbing Specialty Code (OPSC).

a) Ductile iron storm pipe shall be Class 50 pipe conforming to AWWA C-151, and cement-mortar lined and seal coated in accordance with AWWAC-104.

a) Non-reinforced concrete pipe and specials shall conform to AASHTO M86 (ASTM C-14), Class 3 minimum.

b) Joints shall be bell and spigot with an O-ring as specified or shown on the drawings and conforming to the following:

(1) Bell and Spigot joints shall be sealed with flexible watertight gaskets meeting or exceeding all requirements of Federal Specifications SS-S-06210 (GSA, PSS Washington, DC) "Sealing Compounds, Preformed Plastic for Pipe Joints," type 1 Ropeform. Such gaskets may be RAMNEK as manufactured by K.T. Snyder Co., Inc., of Houston, Texas; KENTSEAL No. 2 Joint Sealant as manufactured by Hamilton Kent Mfg., Co., of Kent, Ohio, or approved equal.

(2) O-Ringjoints shall conform to ASTM C-443. The gaskets shall conform to material requirements of ASTM C-361.

a) Reinforced concrete pipe shall meet the requirements of AASHTO Ml 70 (ASTM C-76) Class IV minimum.

b) Joints shall be O-ring type in conformance with non-reinforced concrete pipe joint and gasket specifications above.

a) Pipe and fittings shall conform to ASTM D-3034, SDR 35 or ASTM F 679, SDR 35 as outlined above.

b) Pipe shall be continually marked with manufacturer's name, pipe size, cell classification, SDR rating, and ASTM classification.

c) The joints shall conform to ASTM D-3212, Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals.

a) Pipe and fittings shall have integrally formed smooth interior pipe surface.

b) Pipe and fittings shall conform to the requirements as listed in the table above.

c) HDPE (High Density Polyethylene) pipe conforming to AASHTO M- 252 (8"-10") or AASHTO M-294 (2:12"). For slopes less than 6% the pipe shall be ADS N-12 IB ST, Rancor Sure-Lok F477, or approved equal. For slopes greater than 6% the pipe shall be ADS N-12 IB WT, Rancor Blue Seal, or approved equal with watertight pressure testable fittings.

a) Double wall smooth bore corrugated polyethylene tile, manufactured under specifications ASTM F 667, shall be required for all subsurface drain tile installed in swales.

b) Single wall corrugated polyethylene drain tile shall be required for curb sub-grade drainage.

c) Polyethylene tile shall possess male and female pipe ends, which allow the construction of overlapping, gasket pipe joints, in conformance with the requirements of ASTM D 3212.

d) The gasket material shall conform to all requirements of ASTM F 477. As an alternative, pipe joints utilizing external couplings bands will be accepted, provided the minimum size shown on the drawings and shall meet all requirements of these specifications.

e) Subsurface drains (SSD) shall have a minimum of four hundred (400) feet between structures and have clean-outs installed ever four hundred (400) feet or at changes in direction.

1) Except as otherwise specified, joints for pipe shall be watertight joints using elastomeric ring gaskets. The gaskets shall be securely fixed into place so that they cannot be dislodged during joint assembly.

2) The gaskets shall be of a composition and texture which is resistant to common ingredients of drainage, including oils and groundwater, and which will endure permanently under the conditions of the proposed use.

1) Fittings shall be of the same material as the pipe, molded or formed to suit pipe size and end design, in required tee, bends, elbows, cleanouts, reducers, traps and other configurations as required.

2) Manufactured fittings shall be used for all connections to existing or new storm drains.

1) Except as modified herein, precast concrete pipe manhole sections, transition sections, eccentric cones, flat slab tops, and adjusting rings shall conform to the requirements outlined under Division 4, Sanitary Sewers and as shown in the standard details.

2) Steps shall not be required for manholes 4 feet or less in depth (rim to invert).

3) Manhole castings for storm manholes shall have 16-hole lids.

4) Pollution/Flow Control Manholes

a) Pollution/flow control manholes shall be provided the diameter casting and lid required by the standard detail drawing.

1) Except as modified herein, mainline storm cleanouts (where approved by the City) shall conform to the requirements outlined under Division 4, Sanitary Sewers and as shown in the standard details.

2) A 3,300psi concrete collar is required for cleanouts located outside of paved areas. The shaft or chimney of the cleanout shall be a minimum of 8-inches in diameter.

1) All concrete shall conform to the requirements of OSSC, Commercial Grade Concrete, 3300 psi.

1) Underground warning tape shall be detectable or non-detectable acid and alkali resistant safety warning tape. The tape shall consist of a minimum 4.0 mil (0.004") thick, virgin low-density polyethylene plastic film formulated for extended use underground. The tape shall be in accordance with the APWA national color code and shall be permanently imprinted in lead free black pigments suitable for direct burial.

2) The tape shall be safety green and shall be provided with the legend "CAUTION BURIED STORM DRAIN LINE BELOW" or approved equivalent printed continuously down the length of the tape.

1) A continuous insulated 12 gauge solid core copper toning wire shall be supplied with non-metallic pipe. Insulation shall be white in color for storm piping.

Wire shall penetrate into manholes and catch basins within 18 inches of the rim elevation.