01 57 28 - Temporary Flow Control.pdf

01 57 28 - TEMPORARY FLOW CONTROL

Herbert, Rowland & Grubic, Inc. 01 57 28 - 1 007297.0444

SECTION 01 57 28 - TEMPORARY FLOW CONTROL

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Responsibilities for temporary facilities and controls.

B. Temporary Controls:

1. Water control.

2. Pollution control.

C. Removal of utilities, facilities, and controls.

1.2 DEFINITIONS

A. Bypass Pumping: Temporary flow control accomplished by diverting flow away from the Work area using one or more pumps.

B. Temporary Flow Control: Reducing, limiting, or excluding flow in or to a sanitary sewer, storm sewer, pump station, force main, or other facility as required for performing the Work under the Contract. Draining, handling, and disposal of sanitary sewage and stormwater from pipelines and other facilities as required for performing the Work under the Contract is also part of temporary flow control.

C. Temporary Flow Control Plan: Plan prepared by Contractor containing complete information on how Contractor proposes to perform temporary flow control in accordance with specified requirements.

1.3 SYSTEM DESCRIPTION

A. Provide facilities and controls required to intercept, convey, and discharge flow to be controlled; include redundant standby and emergency equipment:

1. The design, installation, and operation of the Temporary Flow Control system shall be the Contractor’s responsibility. The Contractor may employ the services of a vendor who can demonstrate to the Engineer that they specialize in the design and operation of temporary bypass pumping systems and Temporary Flow Control facilities.

B. Conform to regulatory requirements.

C. Protect water resources and other natural resources.

D. Temporary flow control shall be done in a manner that will not interfere or disrupt facility operations, property, or create a nuisance or public menace. Flow shall be conveyed in enclosed pipes that are adequately protected from traffic or other hazards.

E. Sanitary Discharge:

1. To downstream sanitary sewer manhole. See Drawings for manholes.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 2 007297.0444

2. Dumping or free flow on property, gutters, streets, or sidewalks is strictly prohibited.

3. Discharge of sanitary sewage to storm sewers or onto the ground, is strictly prohibited.

1.4 CONDITIONS

A. Obtain approval and secure permits for placement of temporary flow control facilities within or near public roadways.

B. Depth of flow and velocity vary and are subject to change at manholes and pipes where flow must be rerouted to allow for Work. Flow shall be bypassed from an upstream manhole to a downstream manhole. Redundant bypass pumping equipment is required for the duration of the bypass.

C. If precise flow data is needed for this area, the Contractor shall measure flow.

D. Owner will pay cost of energy used. Exercise measures to conserve energy.

1.5 SUBMITTALS

A. Section 01 33 00 – Submittal Procedures: Requirements for submittals.

B. Product Data: Submit manufacturer catalog cuts and other information indicating proposed materials, accessories, details, and construction information.

C. Informational Submittals:

1. Temporary Flow Control Plan.

2. Emergency Cleanup Plan.

3. Special permits required for temporary flow control.

D. Products: Pump information with curves.

1.6 QUALITY ASSURANCE

A. Regulatory Requirements: Comply with Pennsylvania Department of Environmental Protection temporary sanitary flow bypass requirements.

1.7 TEMPORARY FLOW CONTROL PLAN

A. Prepare and submit Temporary Flow Control Plan at least 10 days before starting the Work requiring temporary flow control; include following information:

1. Drawings indicating location of temporary sewer plugs and bypass discharge lines.

2. Traffic Control Plan specifically applicable to temporary flow control adhering to requirements of applicable agencies and as may be specified in Contract Documents.

3. Locations where flow will be intercepted and discharged.

4. Complete descriptions and performance characteristics of pumps, electric power generators, and standby equipment.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 3 007297.0444

1.8 EMERGENCY CLEANUP PLAN

A. Prepare and submit an emergency cleanup plan. As a minimum the plan shall include the following:

1. Procedures for removal of water.

2. Procedures for determining nature and extent of damage and required restoration where restoration is possible.

1.9 WATER CONTROL

A. Grade Site to drain. Maintain excavations free of water. Provide, operate, and maintain necessary pumping equipment.

B. Protect Site from puddles or running water. Provide water barriers as required to protect Site from soil erosion.

1.10 REMOVAL OF UTILITIES, FACILITIES, AND CONTROLS

A. Remove temporary equipment and materials before Final Application for Payment inspection.

B. Remove underground installations to minimum depth of 18-inches.

C. Clean and repair damage caused by installation or use of temporary Work.

D. Restore existing and permanent facilities used during construction to original condition.

Restore permanent facilities used during construction to specified condition.

PART 2 - PRODUCTS

2.1 EQUIPMENT AND MATERIALS

A. General:

1. Provide materials and equipment that will ensure continuous and successful operation of temporary flow control systems.

2. Repair or modify systems as necessary.

3. Unless otherwise shown or specified, materials and equipment may be new or used at Contractor’s option.

B. Plugs:

1. Provide with taps for connection of pressure gauges and air hoses and flow-through capability.

2. Pipe Diameters 24 Inches and Smaller: Use mechanical plugs with rubber gaskets or pneumatic plugs with rubber boots.

3. Pipe Diameters Larger than 24 Inches.

a. Use inflatable bag stoppers made in two (2) or more pieces.

b. Manufacturers:

1) Lansas.

2) Cherne Industries.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 4 007297.0444

3) Or Equal.

C. Pumps:

1. Fully automatic, self-priming units that do not require use of foot valves or vacuum pumps in priming system.

2. Solids handling design with ability to pump minimum 3-inch diameter sphere.

3. Able to run dry for long periods of time to accommodate cyclical nature of flows.

4. Engine: Equipped to minimize noise, sound attenuated. Noise levels shall not exceed 86 dBA at a distance of 50 feet from source.

D. Electric Power Generators:

1. Be able to simultaneously start and run electric powered pumps required for flow to be controlled.

2. Equipped to minimize noise. Noise levels shall not exceed 86 dBA at a distance of

50 feet from source.

3. Include automatic transfer switch if flow control system is to operate unattended.

E. Standby Equipment:

1. Standby Pump: One of each size to be available onsite at all times.

2. Electric Power Generators: Minimum of one if temporary flow control system contains electric powered pump. Able to simultaneously start and run electric powered pumps required for flow to be controlled.

F. Piping:

1. Pump Suction and Discharge Hoses: Flexible hoses, associated couplings, and connectors that are abrasion resistant, suitable for the intended services, and shall be rated for the external and internal loads anticipated, including test pressure.

2. HDPE Pipe:

a. Comply with ASTM F714, ASTM D3035, ASTM D3350, and/or PE 4710.

PART 3 - EXECUTION

3.1 GENERAL

A. Install temporary flow control facilities in a location acceptable to the Township and Engineer.

B. Operate and maintain temporary flow control 24 hours per day, 7 days per week, including without limitation, holidays, as required to control flows. The Contractor is responsible for all fuel costs associated with the temporary flow control system.

C. Contractor shall either man the temporary flow control system when in operation, or provide an alarm system with automatic autodialer to provide notification upon an alarm:

1. If the temporary flow control system is not manned, the Contractor shall have personnel available able to respond and be onsite within 30 minutes of an alarm notification.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 5 007297.0444

D. The Contractor shall protect water resources, wetlands, and other natural resources during the work.

E. It shall be the responsibility of the Contractor to provide protection for the entire bypass pumping system including but not limited to piping, piping connections, pumps, and ancillary equipment. Materials utilized for bypass pumping shall be appropriate for the intended operation and service. The Contractor shall be responsible for any damage caused by the Contractor’s failure to provide adequate protection to the bypass pumping system.

F. Promptly remove temporary flow control facilities as soon as they are no longer needed.

3.2 REQUIRED TEMPORARY FLOW CONTROL

A. Eliminate flow from pipe segment, manhole, or other structure where Work will be performed. Flow must be rerouted around the Work area.

3.3 INSTALLATION

A. The Contractor shall plug off and pump down the sewer manhole or pipe segment in the immediate work area and shall maintain the sanitary sewer system so that surcharging does not occur.

B. The Contractor shall ensure that no damage will be caused to private property, municipal, or state right-of-way, or waterways, as a result of temporary flow control operations.

Ingress and egress to adjacent properties shall be maintained. Ramps, steel plates, or other methods shall be deployed by the Contractor to facilitate traffic over surface piping.

If open cut crossings of municipal or state roadways to temporarily bury bypass piping is required by the Contractor and no other methods of crossing the road are available, the Contractor shall perform the following:

1. Removed bypass piping at the completion of the work.

2. Restore the roadway in accordance with the municipal requirements.

C. The Contractor shall complete the work as quickly as possible and satisfactorily pass tests, inspections, and repair deficiencies prior to discontinuing bypass pumping operations and returning flow to the sanitary sewer system.

D. The Contractor shall immediately notify the Owner should a surcharge occur that results in an overflow of sewage. If the Contractor is unable to remedy the situation, then he should suspend or terminate the work until such time as the overflows have been controlled. Should such surcharge damage the materials and/or equipment that is used on the job and/or adjacent property, it shall be corrected at no additional cost to the Owner. In the event that sewage accidentally drains into the drainage system or street, the Contractor shall immediately stop the overflow, notify the Owner and take the necessary action to clean up and disinfect the spillage to the satisfaction of the Engineer.

If sewage is spilled onto public or private property, the Contractor shall wash down, clean up and disinfect the spillage to the satisfaction of the Engineer.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 6 007297.0444

E. The Contractor shall locate bypass pumping suction and discharge lines and pumping and hauling vehicles so as to not cause undue interference with the use of streets, private driveways and alleys.

F. The Contractor shall not intentionally damage or remove portions of existing sanitary sewer structures for the purpose of installing bypass pumping system without specific approval from the Owner or Engineer. If a structure is damaged, it shall be reconstructed or replaced to the satisfaction of the Owner at no additional cost to the Owner.

G. The Contractor shall coordinate the pumping and hauling disposal/dump location with the Owner.

H. The Owner shall not be responsible for damage to the temporary flow control system sustained by the Contractor directly or indirectly as a result of stormwater runoff within streets, ditches. The Contractor shall be responsible for damage that results directly or indirectly from the interference of stormwater runoff to temporary flow control equipment, piping and/or appurtenances. It is the intent of these specifications to require the Contractor to establish adequate temporary flow control systems as required regardless of the flow conditions.

3.4 CLEANUP AND REMOVAL

A. The Contractor shall restore the bypass pump area and the bypass piping route to pre-bypass condition including any cleanup measures necessary due to fuel, coolant, oil, and sewage leaks. The Contractor shall document any cleanup measures that were necessary.

The Contractor’s bypass pumping plan shall ensure that all sewage in the bypass pumps, pipes, and fittings has been emptied into the sanitary sewer system.

3.5 FIELD QUALITY CONTROL

A. Testing:

1. The temporary flow control system shall be placed into operation and the entire system shall be visually monitored for leaks. Any leaks encountered shall be repaired at no cost to the Owner. Upon successful confirmation of the bypass pumping system by the Engineer, the sewer to be bypass can be plugged.

END OF SECTION