Attach 9 - Storm Drainage Spec.pdf

FA4488-09-R-0033

Attachment 9

11-05M

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STORM DRAINAGE SPECIFICATION

PART 1 - GENERAL

1.1 DESCRIPTION:

This section specifies construction of outside, underground storm drain systems. The storm drain systems shall be complete and ready for operation, including all drainage structures, frames, grate and covers, connections to new buildings, structure service lines, existing storm lines and existing drainage structures and all required incidentals.

1.2 RELATED WORK:

A. Excavation, Trench Widths, Backfill and earth moving.

1.3 QUALITY ASSURANCE:

A. Products Criteria:

1. Multiple Units: When two or more units of the same type or class of materials or equipment are required, these units shall be products of one manufacturer.

B. Comply with the rules and regulations of the Public Utility having jurisdiction over the connection to public storm drains and the extension, and/or modifications to Public Utility systems.

1.4 APPLICABLE PUBLICATIONS:

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. American Society for Testing and Materials (ASTM):

A655-04e1/A655M-04e1... Reinforced Concrete D-Load Culvert, Storm Drain

PART 2 - PRODUCTS

2.1 PIPING:

A. Gravity Lines (Pipe and Appurtenances):

1. Concrete:

a. Reinforced pipe, ASTM C76. D-Load, 300 mm through 2740 mm (12 inches through 108 inches). Reinforced arch culvert and storm drainpipe shall comply with ASTM C506, Joints shall be watertight.

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b. Corrugated PE Pipe: Shall comply with for pipes 300 to 1500 mm (12 to 60 inches). Pipe walls shall have following minimum properties:

Nominal Size Minimum Wall Area Min. Moment of Inertia mm4/mm

(in4/in)

300 mm (12 in) 3200 mm²/m (1.50 in²/ft) 390 (.024)

375 mm (15 in) 4000 mm²/m (1.91 in²/ft) 870 (.053)

450 mm (18 in) 4900 mm²/m (2.34 in²/ft) 1020 (.062)

600 mm (24 in) 6600 mm²/m (3.14 in²/ft) 1900 (.116)

750 mm (30 in) 8300 mm²/m (3.92 in²/ft) 2670 (.163)

900 mm (36 in) 9500 mm²/m (4.50 in²/ft) 3640 (.222)

1050 mm (42 in) 9900 mm²/m (4.69 in²/ft) 8900 (.543)

1200 mm (48 in) 10900 mm²/m (5.15 in²/ft) 8900 (.543)

1350 mm (54 in) 12000 mm²/m (5.67 in²/ft) 13110 (.800)

1500 mm (60 in) 13650 mm²/m (6.45 in²/ft) 13110 (.800)

c. Profile Wall PE Pipe: Shall comply with ASTM F894, Class 160, produced from PE certified by the resin producer as meeting the requirements of ASTM D3350, Minimum cell class 334433C. Pipe walls shall have following minimum properties:

Nominal Size Minimum Wall Area Min. Moment of Inertia mm4/mm

(in4/in)

450 mm (18 in) 6300 mm²/m (2.96 in²/ft) 850 (.052)

525 mm (21 in) 8800 mm²/m (4.15 in²/ft) 1150 (.070)

600 mm (24 in) 9900 mm²/m (4.66 in²/ft) 1330 (.081)

675 mm (27 in) 12500 mm²/m (5.91 in²/ft) 2050 (.125)

750 mm (30 in) 12500 mm²/m (5.91 in²/ft) 2050 (.125)

825 mm (33 in) 14800 mm²/m (6.99 in²/ft) 2640 (.161)

900 mm (36 in) 17100 mm²/m (8.08 in²/ft) 3310 (.202)

1050 mm (42 in) 16500 mm²/m (7.81 in²/ft) 4540 (.277)

1200 mm (48 in) 18700 mm²/m (8.82 in²/ft) 5540 (.338)

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PART 3 - EXECUTION

3.1 EXCAVATION FOR STORM DRAINS AND DRAINAGE STRUCTURES:

Excavation of trenches and for appurtenances and backfilling for storm drains, shall be in accordance with the applicable portions of Section

31 20 00, EARTH MOVING.

3.2 GENERAL PIPING INSTALLATION:

A. Lay pipes true to line and grade.

B. Do not lay pipe on unstable material, in wet trench or when trench and weather conditions are unsuitable for the work.

C. Support pipe on compacted bedding material. Excavate bell holes only large enough to properly make the joint.

D. Inspect pipes and fittings, for defects before installation. Defective materials shall be plainly marked and removed from the site. Cut pipe shall have smooth regular ends at right angles to axis of pipe.

E. Clean interior of all pipe thoroughly before installation. When work is not in progress, open ends of pipe shall be closed securely to prevent entrance of storm water, dirt or other substances.

F. Lower pipe into trench carefully and bring to proper line, grade, and joint. After jointing, interior of each pipe shall be thoroughly wiped or swabbed to remove any dirt, trash or excess jointing materials.

G. Do not walk on pipe in trenches until covered by layers of shading to a depth of 300 mm (12 inches) over the crown of the pipe.

1. Reinforced Concrete Pipe: Comply with manufacturer’s recommendations with gasketed joints.

3.3 REGRADING:

A. Raise or lower existing manholes and structures frames and covers in regraded areas to finish grade. Carefully remove, clean and salvage cast iron frames and covers. Adjust the elevation of the top of the manhole or structure as detailed on the drawings. Reset cast iron frame and cover, grouting below and around the frame. Install concrete collar around reset frame and cover as specified for new construction.

B. During periods when work is progressing on adjusting manholes or structures cover elevations, the Contractor shall install a temporary cover above the bench of the structure or manhole. The temporary cover shall be installed above the high flow elevation within the structure, and shall prevent debris from entering the wastewater stream.

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C. The Contractor shall comply with all OSHA confined space requirements when working within existing structures.

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