01 57 28 - Temporary Flow Control.pdf

01 57 28 – TEMPORARY FLOW CONTROL

Herbert, Rowland & Grubic, Inc. 01 57 28 - 1 000483.0450

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.

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.

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.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 2 000483.0450

1.4 CONDITIONS

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

B. Basic hydraulic and hydrologic data applicable to the site are either furnished with these documents or are available for inspection in offices of the Engineer. The Contractor has full responsibility for the adequacy, safety, and maintenance of the diversion works and for the repair of any damage occurring to the works as a result of overflow.

C. West Pump Station is permitted to handle the following flows, which are experienced at the facility and representative of the flow conditions:

a. Design Capacity: 698 gpm at 169’ TDH

D. NCCMA shall be contacted for any work required on the existing pump station.

1.5 SUBMITTALS

A. Informational Submittals

1. Temporary Flow Control Plan

2. Emergency Cleanup Plan

3. Special permits required for temporary flow control

B. Products: Pump information with curves.

1.6 QUALITY ASSURANCE

A. Qualifications: Temporary Flow Control System Designer: Professional engineer who has at least 5 years’ experience in design of such systems and who is registered in the State of Pennsylvania.

B. 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 ten (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 000483.0450

1.8 EMERGENCY CLEANUP PLAN

A. Prepare and submit an emergency cleanup plan. As a minimum 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 Substantial Completion inspection.

B. Remove underground installations to minimum depth of 2 feet. Grade Site as indicated on Drawings.

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:

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

5. Manufacturers:

a. Lansas.

b. Cherne Industries.

Herbert, Rowland & Grubic, Inc. 01 57 28 - 4 000483.0450

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 three (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. Noise levels shall not exceed 86 dBA at a distance of fifty (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 fifty (50) feet from source.

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

E. Standby Equipment:

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

2. Electric Power Generators: Minimum of 1 if temporary flow control system contains electric powered pump. Able to simultaneously start and run electric powered pumps required for flow to be controlled.

PART 3 - EXECUTION

3.1 GENERAL

A. Install temporary flow control facilities in a location acceptable to Owner’s Operations and Facility Maintenance.

B. Operate and maintain temporary flow control 24 hours per day, 7 days per week, including without limitation, holidays, as required to control flows while area of Work is out of service.

3.2 BLOCKING FLOW

A. Flow control may consist of blocking flow with mechanical or pneumatic plugs if adequate storage is available.

B. When blocking flow is no longer needed for performance and acceptance of the Work, remove plugs in a manner that permits sewage flow to slowly return to normal without surcharging or causing other major disturbances downstream.

C. Remove temporary plugs at end of each working day and restore normal flow. If downstream work is not or cannot be completed during workday provide, operate, and maintain bypass pumping system or other method of flow control to accommodate flows.

END OF SECTION 01 57 28