TEMPORARY FACILITIES

TEMPORARY FACILITIES


PART 1 - GENERAL

1.1      WORK DESCRIPTION

A. This Section describes the Contractor’s responsibilities for the temporary handling of wastewater and other process streams throughout the construction of the project. Temporary facilities provided by the Contractor shall be reliable and failsafe.

1.2      SUBMITTALS

A.    Unless otherwise indicated, the following shall be submitted to the Resident Project
Representative in compliance with the General Conditions, and as specified herein.

1.     Bypass and/or temporary pipe material, fittings, and thrust restraint details.

2. Plans showing details of proposed method of temporary handling of flow, routing of bypass lines, containment areas, equipment location, schematic of pump set- up and discharge, and proposed sequencing.

3.     Pump characteristic curves, electrical, controls, and instrumentation (is used).

4. Plans for temporary facilities used to provide Plant Water to fill structures for testing.

5. Spill Prevention, control, and countermeasure plan as described in Part 3 of this specification.

1.3      REFERENCE SPECIFICATIONS, PERMITS AND OTHER RELEVANT DOCUMENTS

A. The work of the following sections applies to the work of this Section.  Other sections of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this work

1.         General Conditions

2.         Section 01311, Scheduling and Reporting

3.         Section 01313, Construction and Schedule Constraints

4.         Section 01530, Protection of Existing Facilities

5.         Section 03936, Water Leakage Test for Concrete Structures

B. Copies  of  various  District  permits  from  the  Regional  Water  Quality  Control  Board (RWQCB) and the South Coast Air Quality Management District (SCAQMD) are available from the District at no cost upon request.

C. Drawings may illustrate some of the steps in the sequence of construction and shows some of the temporary facilities required for construction.

1.4      PAYMENT

A. Full compensation for temporary handling of sewage and the spill prevention, control and countermeasure plan shall be included in the Contractor’s bid price and no additional compensation will be made to the Contractor for this work.  The bid price shall include all labor, materials, tools, and equipment necessary and/or incidental to the temporary operations.

PART 2 - PRODUCTS

2.1      PUMPING EQUIPMENT

A.   If the Contractor elects to use temporary pumps to facilitate any portion of the work, these pumps must be engine driven. The engines shall be muffled in such a manner that the maximum noise level will not exceed 80 dBA at a distance of five feet from the engine. Regardless of the noise level, soundproofing shields not less than eight feet high shall be provided around each engine by the Contractor to absorb noise.   Standby pumping equipment shall be at the site continuously during temporary pumping to provide 100 percent standby pumping capacity.   The Contractor shall provide manpower to continuously   monitor   the   temporary   pumping   equipment   on   a   24-hour/day   and
7days/week basis while in operation and activate standby equipment, if necessary. The contractor shall be solely responsible for the sizing of the temporary pumping facilities.

2.2      TEMPORARY PIPELINE PLUGGING

A. Plugs shall be a heavy-duty inflatable type with a steel rod through the plug centerline, a retaining plate and an eyelift on both ends.   Plugs shall be new, made of neoprene rubber and shall show no cracks or signs of damage.  The plugs shall have a flexible sealing design to compensate for any irregular interior surface of the piping.  The plug length shall be suitable for the specific application as shown in the drawings.  Plugs shall be equipped with continuous pressure monitoring and an audible alarm which will sound when pressure drops below 25 psi.  The plug pressure rating shall not be less than 30 psi.   The eyelifts shall be secured to a stainless steel pulling cable. The pulling cable shall be a minimum of 5/8-inch in diameter.

2.3      TEMPORARY PIPING

A. If  the temporary piping sizes  are shown  on  the drawings, those sizes shall be the minimum inside diameter of the temporary piping.  The Contractor shall be responsible to size temporary piping in locations where the size is not shown on the drawings.

B. The temporary 36 inch and 12 inch raw sewage (RS) piping may be of steel or HDPE; however, the Contractor may choose the temporary pipeline materials and joints.  The joints of any temporary pipeline, which carries raw sewage or primary effluent must not leak (zero leakage).  The Contractor shall provide pipe supports and thrust restraints as necessary.

C. Supports and thrust blocks for temporary piping shall be adequate for the “worst case” operating condition (e.g. highest flows and pressures).  The temporary pipeline from the Screen Structure to the Selector Zone inlet channel “worst case” condition is 22 MGD, velocity flowing full of 5 feet per second and a head of 20 feet.

D. Grating, cover plates or tank covers that have to be removed to facilitate temporary connections shall be removed in a safe manner that allows for process functions to continue.  Any opening in grating or cover plates caused by the installation of temporary facilities shall be covered with heavy steel plates to protect the operators.

PART 3 - EXECUTION

3.1       TEMPORARY HANDLING OF SEWAGE

A. The  Contractor  shall  construct,  operate,  maintain,  and  remove,  without  damage  to existing structures, all temporary sewage handling facilities.  Owner forces will not assist the Contractor with wastewater and other process stream handling during construction. The Contractor shall submit details of his proposed method of temporary handling of sewage or process flows for review and acceptance by the Engineer.   The Contractor shall investigate and monitor the flow conditions.  Temporary facilities may require the construction of bypass lines and bulkheads, pumping, or a combination thereof.

B. Under no circumstances shall sewage or solids be spilled onto the ground surface, streets, or into ditches, catch basins or storm drains or natural drainage ways.  Sewage shall be contained and handled in a manner so as not to create a public nuisance or health hazard, or a violation of District permits.

C. District personnel shall not be responsible for construction or maintenance of temporary facilities except that they will continue to operate the plant while the temporary facilities are in service.  For example, while wastewater is temporarily routed through the Screen Structure, see Drawing G14, District personnel will be responsible for operation of the climber screens.

D. Any leakage on the west side of the 36-inch diameter temporary pipeline will tend to flow to the west towards the Plant main entrance.   Such an event must be avoided.   As a result, where the temporary pipeline crosses the Plant roads temporary culvert pipes shall be installed under the pipeline to contain and direct any rain water and sewage spills to the east.

3.2       SPILL PREVENTION, CONTROL AND COUNTERMEASURE PLAN

A. The  Contractor  shall  prepare,  submit  and  carry  out  a  spill  prevention,  control  and countermeasure plan that incorporates the following:

B.         The Contractor shall include or reference in the plan, materials provided as submittals per
Subsection 1.2.

C. The Contractor shall provide in the plan a description of all emergency equipment for bypassing flow, containment, cleanup, and repair of any damage.  Specifics shall include as applicable, but are not limited to:

1.         Pipe patch kits

2.         Sand bags

3.         Rubber matting

4.         Bypass pipes, pumps, and other relevant equipment
5.         Backup pumps (if pumps are required)

6.         Secondary containment in trenches or other surrounding land relief

D.         The Contractor shall maintain equipment on site for prevention and cleanup of spills.

E. The Contractor shall provide at least three (3) people who can be contacted 24 hours per day  by  phone  to  address  on  site  emergencies  caused  by  the  failure  of  temporary facilities.  The Contractor shall provide the daily schedule with names, phone numbers, and hourly working schedules of three persons that may be brought on site any time. Contractor shall provide notification of any substitution in writing at least two days in advance.  If temporary bypass pumping is provided, the Contractor shall have at least one person on site 24 hours per day to monitor and maintain the temporary pumping facilities and implement emergency procedures in case of an emergency.

F. The  Contractor  shall  describe  the  method  used  to  protect  storm  drains  during construction on the plan.   The description shall include where the storm drains are located (simple map of sewer pipe, storm drains, waterways, and any relief features) that could assist in containing the spill.   The plan shall describe how storm drains will be blocked in the event of a spill (what material, who will do it, how long it will take). Describe any other response-related plans (bypass pumping set ups, etc.).

1. The  Contractor  shall  coordinate  the  plan  with  the  construction  storm  water management Best Management Practices (BMP) to protect water quality and respond to spills of sewage, groundwater, or fuels, ensuring there are no conflicts with  implementing  each  of  the  respective  programs.    The  Contractor  shall describe all spill prevention measures (e.g. monitoring of upstream manholes, monitoring in the trench).

G.         The following spill procedures shall be incorporated into the Contractor’s plan.

1. If a spill is detected or a catastrophic pipe failure occurs, the immediate priority of the Contractor shall be to prevent any sewage from reaching surface waters, surface streets and storm drains.   The Contractor shall immediately protect all drains using rubber mats or sand bags (have sand bags on site).

2. The Contractor shall anticipate the following failure mode in his plan and be prepared to act accordingly.

3. As the Contractor is excavating for a new trench and comes across moderate leaks in the existing pipe, the Contractor shall make coupling/clamp repairs as soon as possible to minimize leakage into the trench.  If the leak is too large to make fast coupling repair, the Contractor shall start bypassing (see bypassing sequence below), then make repair.

4. In case of catastrophic leak, the Contractor shall immediately start the bypassing sequence:

a.         Plug the piping upstream from the leak.

b.         Insert bypass pump.  The pump shall be sized to handle the peak flow.
The Contractor shall contact the District for flow data before construction starts.  The Contractor is to provide spare pump or set up standby pump availability with rental yard.

c. Connect hose from pump to discharge point.  Hose shall already be in place and connected to a downstream discharge point at all times when working near or with live sewers.

5. In event of any spill, the Contractor shall immediately and in parallel with above activities, notify the Resident Project Representative and District personnel. It is the Contractor’s responsibility to provide the primary means for pipe repair and spill recovery and clean-up including mobilizing any necessary equipment to be onsite within an hour of a spill.  Clean up may require a sweeper truck, Vactor truck, and/or other equipment.

6. The Contractor shall attempt to pond the water in an area away from storm drains that can be easily and fully recovered for discharge to the plant drainage system.

7. The Contractor will cooperate with the District staff to the fullest extent possible in order to minimize the impacts and volume of the spill in the most efficient manner possible.

8. No  form  of  disinfection  is  allowed  (especially  if  the  water  is  reaching  State waters). All  wash  water  and  sewage-contaminated  wash  water  must  be contained and recovered in the same manner as the sewage.

9. In the event of a spill, the Contractor shall be prepared to document the spill, its likely   cause,   and   the   coordinated   response   with   a   video   camera   and photographs.  The Contractor is required to attend a debriefing immediately after the spill is contained and cleaned up.

H. The Contractor shall comply with the Regional Water Quality Control Board, Health Department, and the District Standards, permits, and regulations. The Contractor shall cooperate with District staff and other regulators and environmental agencies. In the event the Regional Water Quality Control Board levies a fine on the District because of a spill caused by the Contractor (directly  or  indirectly)  due to his lack of attention to procedures or other negligence, the Contractor shall be held responsible.   The entire amount  of  any  fine  imposed  by  the  Regional  Water  Quality  Control  Board  will  be deducted from the Contractor’s progress payment.  The California Water Code gives the Regional Water Quality Control Board authority to fine up to $10 per gallon and $10,000 per day for an illicit discharge.

END OF SECTION