18-01505 Temporary Bypass Pumping System.pdf

PIPE LINING 01505-1 TEMPORARY BYPASS PUMPING

SYSTEM

SECTION 01505

TEMPORARY BYPASS PUMPING SYSTEM

PART 1 GENERAL

1.1 SCOPE

A. Under this item, the Contractor is required to furnish all materials, labor, equipment, power, maintenance, etc. to implement a temporary pumping system for the purpose of diverting the existing flow around the work area for the duration of the project.

B. The design, installation, and operation of the temporary pumping system shall be the Contractor’s responsibility. The Contractor shall demonstrate to the Engineer that he is experienced in the design and operation of temporary bypass pumping systems. The Contractor shall provide at least five references of projects of a similar size and complexity as this project. The bypass system shall meet the requirements of all codes and regulatory agencies having jurisdiction.

1.3 SUBMITTALS:

C. The Contractor shall prepare a specific, detailed description of the proposed bypass pumping system.

D. The Contractor shall submit to the Engineer detailed plans and descriptions outlining all provisions and precautions to be taken by the Contractor regarding the handling of existing wastewater flow. This plan must be specific and complete, including such items as schedules, locations, elevations, capacities of equipment, materials, and all other incidental items necessary to ensure proper protection of the facilities, including protection of the access and bypass pumping locations from damage due to the discharge flows, and compliance with the requirements and permit conditions specified in these Contract Documents. No construction shall begin until all provisions and requirements have been reviewed by the Engineer.

C. The plan shall include, but not be limited to, the following details:

PIPE LINING 01505-2 TEMPORARY BYPASS PUMPING

1. Staging area for pumps.

2. Sewer plugging method and types of plugs.

3. Number, size, material, location, and method of installation and location of installation of discharge piping.

4. Number, size, material, location, and method of installation and location of installation of suction piping.

5. Bypass pump sizes, capacity, number of each size to be on site and power requirements.

6. Calculations of static lift, friction losses, and flow velocity (pump curves showing pump operating range shall be submitted).

7. Standby equipment size and location.

8. Downstream discharge plan.

9. Schedule.

1.4 EQUIPMENT

A. All pumps used shall be fully automatic self-priming units that do not require the use of foot-valves or vacuum pumps in the priming system. The pumps may be electric, gasoline or diesel powered. All pumps used must be constructed to allow dry running for long periods of time to accommodate the cyclical nature of effluent flows. All pumps shall be Godwin ‘Dri-Prime’ automatic self-priming quiet pumps, or approved equal.

B. The Contractor shall provide the necessary stop/start controls for each pump.

1.5 SYSTEM DESCRIPTION

A. General

1. Contractor shall be responsible for installing temporary fencing and vapor barriers around manholes left open during the lining process.

2. Contractor is responsible for providing a Pollution Control Plan to be reviewed and approved by the Engineer prior to the start of work and for providing the required spill containment equipment on site at all times.

3. Contractor shall be responsible for providing competent personnel on site at all times when the pumps are in operation.

4. Contractor shall provide 24-hour emergency contact list as well as quick response to provide all mechanical maintenance on the bypass pumps and piping systems during pumping operations.

PIPE LINING 01505-3 TEMPORARY BYPASS PUMPING

5. Contractor shall comply with all local, state and federal laws rules and regulations particularly when crossing any road, wetland, stream or stream encroachment with the pumping operations.

6. The Contractor is responsible to remove the bypass pumps and piping system near or in streams to prevent spillage due to floods or high water;

all available measures shall be taken to prevent sewage spills.

7. The Contractor is responsible for all fines and penalties.

8. The Contractor is responsible for providing all of the required pump and pipe calculations (to be reviewed and approved by the Borough Engineer prior to construction).

9. The Contractor is responsible for supplying any required safety equipment needed to set plugs and to maintain the bypass pumping system.

10. The Contractor is responsible for providing and installing all required strainers, suction hose, and blow offs.

11. The Contractor is responsible for properly bypassing all feeder sewers and laterals.

12. The Contractor is responsible for all spills and overflows due to bypass pumping and bypass piping failures and is required to monitor the upstream sewers to ensure there is no surcharge condition.

13. The Contractor is responsible for all traffic control.

B. Design Requirements:

1. Bypass pumping systems shall have sufficient capacity to safely carry the existing pipe capacity. The Contractor shall provide all pipeline plugs, pumps of adequate size to handle peak flow, and temporary discharge piping to ensure that the total incoming flow can be safely diverted. The CONTRACTOR(s) shall assume all risks in bypass pumping for this project.

2. The Contractor shall have adequate standby equipment available and ready for immediate operation and use in the event of an emergency or breakdown.

3. Bypass pumping system shall be capable of bypassing the flow around the work area and of releasing any amount of flow up to full available flow into the work area as necessary for satisfactory performance of work.

C. Performance Requirements:

PIPE LINING 01505-4 TEMPORARY BYPASS PUMPING

4. It is essential to the operation of the existing sewage system that there be no interruption in the flow of sewage throughout the duration of the project. To this end, the Contractor shall maintain and operate all temporary facilities such as dams, plugs, pumping equipment (both primary and back-up units as required), conduits, all necessary power, and all other labor and equipment necessary to intercept the sewage flow before it reaches the point where it would interfere with his work, carry it past his work, and return it to the existing sewer downstream of his work.

2. The design, installation, and operation of the temporary pumping system shall be the Contractor’s responsibility. The bypass system shall meet the requirements of all codes and regulatory agencies having jurisdiction.

3. The Contractor shall provide all necessary means to safely convey the sewage past the work area. The Contractor will not be permitted to stop or impede the main flows under any circumstances.

4. The Contractor shall maintain sewer flow around the work area in a manner that will not cause surcharging of sewers or damage to sewers, and that will protect public and private property from damage and flooding.

5. The Contractor shall protect water resources wetlands and other natural resources.

1.6 FIELD QUALITY CONTROL AND MAINTENACE

A. Inspection:

1. Contractor shall be responsible for setting up and testing the bypass pumps and bypass piping system with fresh water, to ensure there are no leaks, prior to pumping sewage.

2. All bypass pipe shall be tested for leaks prior to use and capable of safely handling the maximum flows and properly secured against movement.

3. Contractor shall be responsible for monitoring bypass pumps at all times.

Pumps shall not be left in place at night or left unsupervised at any time.

B. Maintenance Service:

1. The Contractor shall ensure that the temporary pumping system is properly maintained, and a responsible operator shall be on hand at all times when pumps are operating.

PIPE LINING 01505-5 TEMPORARY BYPASS PUMPING

2. Adequate hoisting equipment for each pump and accessories shall be maintained on the site.

1.7 PREPARATION

A. Precautions

1. Contractor is responsible for locating any existing utilities in the area the Contractor selects to locate the bypass pipelines. The Contractor shall locate his bypass pipelines to minimize any disturbances to existing utilities and shall obtain approval of the pipeline locations from the local municipality and the Engineer. All costs associated with relocating utilities and obtaining all approvals shall be paid by the Contractor.

2. During all bypass pumping operations, the Contractor shall protect the sewer system and main and all local sewer lines from damage inflicted by any equipment. The Contractor shall be responsible for all physical damage to the sewer system and main and all local sewer lines caused by human or mechanical failure.

1.8 INSTALLATION AND REMOVAL

A. Plugging or blocking of sewage flows shall incorporate a primary and secondary plugging device. When plugging or blocking is no longer needed for the performance and acceptance of work, it is to be removed in a manner that permits the sewage flow to slowly return to normal without surge, to prevent surcharging or causing other major disturbances downstream.

B. When working inside manhole, the Contractor shall exercise caution and comply with OSHA requirements when working in the presence of sewer gases, combustible or oxygen-deficient atmospheres, and confined spaces.

C. The installation of the bypass pipelines must be located off streets and sidewalks and on shoulders of the roads. When the bypass pipeline crosses local streets and private driveways, the Contractor must place the bypass pipelines in trenches and cover with temporary pavement or provide pump ramps. When the bypass pipeline crosses a drainage area or stream, the Contractor must properly protect the area and support the bypass pipelines. Upon completion of the bypass pumping operation, and after the receipt of written permission from the Engineer, PIPE LINING 01505-6 TEMPORARY BYPASS PUMPING the Contractor shall remove all the piping, restore all property to pre-construction condition and restore all pavement. The Contractor is responsible for obtaining any approvals for placement of the temporary pipeline within public ways from the local municipality.

D. Contractor shall be responsible for flushing the bypass pumps and piping system with fresh water prior to the end of the bypassing period and breaking down the bypassing system.

E. Contractor shall be responsible for cleaning up all cuttings and lining debris during the break down period.

END OF SECTION