604COMBINATION STORM SEWER AND UNDERDRAIN

604.1DESCRIPTION—This work is construction of combination storm sewer and underdrain.

604.2MATERIAL—

1.a General. When indicated provide a minimum water inlet area of 1.4 square inches per linear foot of pipe.

1.b Reinforced Concrete (RC) Pipe. Section 601.2(a)3. Where specified, provide RC pipe with specified water inlet area according to Pennsylvania Installation Direct Design (PAIDD) computer program, other Department accepted software program, and Publication 280.

1.c Group IP. Section 601.2(a)6.a

1.d Group IIP. Section 601.2(a)6.b

1.e Group IIIP. Section 601.2(a)6.c, and as follows:

1.e.1 Polyethylene. Add the following:

• AASHTO M 294, TypeS, Class 1 perforations, provide specified water inlet area.

1.e.2 Polyvinyl Chloride. Add the following:

• AASHTO M 304, Class 1 perforations, provide specified water inlet area.

1.f Group IVP. Section 601.2(a)6.d, and as follows:

1.f.1 Polyethylene. Add the following:

• AASHTO M 294, TypeS, Class 1 perforations, provide specified water inlet area.

1.g Group VP. Section 601.2(a)6.e, and as follows:

1.g.1 Polyethylene. Add the following:

• AASHTO M 294, Class 1 perforations, provide specified water inlet area.

1.h Group VIP. Section 601.2(a)6.f, and as follows:

1.h.1 Polyethylene. Add the following:

• AASHTO M 294, Class 1 perforations, provide specified water inlet area.

1.h.2 Polypropylene. Add the following:

• AASHTO M 330, Class 1 perforations, provide specified water inlet area.

2.a General. Perforate pipe with Class 1 perforations, according to AASHTO M 36, M 196, or M 245, except provide a minimum water inlet area of 1.4 square inches per linear foot of pipe.

2.b Corrugated Steel Pipe, Metallic Coated. AASHTO M 36, Types I and IR; AASHTO M 218; AASHTO M 274; and AASHTO M 289

2.c Corrugated Steel Pipe-Arch, Metallic Coated. Section 602.2(a)

2.d Corrugated Aluminum Alloy Pipe. AASHTO M 196, Types I and IR

2.e Corrugated Aluminum Alloy Pipe-Arch. AASHTO M 196, Types II and IIR

2.f Coated Corrugated Galvanized Steel Pipe. Section 601.2(a)4.d

2.g Coated Corrugated Galvanized Steel Pipe-Arch. Section 602.2(c)

• Coarse Aggregate. Type C or better, No. 57, Section 703.2

• Geotextile. Class 1, Section 735

604.3CONSTRUCTION—As shown on the Standard Drawings and as follows:

Lay pipe with perforations facing upwards. Place rigid non-metal pipe, keeping the portions of the joints in contact with the coarse aggregate clean, and providing a minimum water inlet area of 1.4 square inches per linear foot by either blocking open, furnishing pipe manufactured with the required water inlet area provided, or by other acceptable means. For Reinforced Concrete Open Joint Pipe, provide joint openings as noted in Table A. Fill the remainder of the joint, as specified in Section 601.3(d).

TABLE A Joint Tolerances for Reinforced Concrete Open Joint Pipe** Pipe Diameter Or Equivalent (inches) Minimum Joint Opening (inches) Maximum Joint Opening (inches) 18-24 0.625 1.000 27-36 0.500 1.000 ≥ 42 0.375 1.275 **Special design joints will be subject to manufacturer submittal and individual review and approval. If the bell depth is greater than the tongue depth, include the difference between these depths to the maximum joint opening.

and as specified in Section 601.3(f) for the portion of the trench where the backfill is being placed and the placement condition. Obtain suitable impervious material, as required.

follows:

• If joint opening is less than the minimum joint opening according to Table A, submit a pipe analysis and a remediation plan as specified in Section 601.3(p). Note all joint openings that are less than the minimum joint opening in the inspection report.

• If joint opening is greater than the maximum joint opening according to Table A without soil infiltration, the pipe joint will be accepted with reduced payment. Note all joint openings that are greater than the maximum joint opening in the inspection report.

• If any soil infiltration is identified at the pipe joint during inspection, submit a pipe analysis and a remediation plan as specified in Section 601.3(p). Note all joints with soil infiltration in the inspection report.

604.4MEASUREMENT AND PAYMENT—

Measured along the length of pipe to the centerline of “T,” “Y,” “K,” and other connections. If pipes are protected by endwalls or connected with drainage structures, include payment for the width of the structure wall. The unit price includes the excavation, the removal and disposal of existing pipe, the impervious material, the pipe, connecting bands, geotextile, and the coarse aggregates for backfill as shown on the Standard Drawings or as indicated. Furnishing personnel and equipment for dewatering operations, inspection of pipes, and all remedial measures are incidental to the pipe items. If the pipe ite m for shore/trench box is indicated or required; the unit price includes placement and removal or keeping in place of shoring, supports, shield systems and trench boxes as specified in Section 601.3(g). Payment for remediation of trench bottom or for obstructions encountered including changes to or the addition of trench support methods, as directed by the Representative, will be made as specified in Section