Section 01722 PROTECTION OF ADJACENT CONSTRUCTION

Section 01722

PROTECTION OF ADJACENT CONSTRUCTION

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. This section covers the CONTRACTOR's responsibilities for coordinating Work on this Project and protecting in place key structures pipelines and conduits.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 01140, Work Restrictions

2. Section 02050, Demolition

3. Section 02200, Earthwork

4. Section 02634, Existing Utilities

1.3 SUBMITTALS

A. The CONTRACTOR shall submit reports and drawings documenting the results of pot-holing and survey work for the pipelines listed below. CONTRACTOR also shall submit pile installation drawings demonstrating that the proposed pile locations will not damage any of these pipelines. These submittals must be accepted by the ENGINEER before any excavation, pile installation or pipeline demolition work can proceed in the vicinity of these pipelines.

1. 72-inch Trickling Filter Effluent pipe

2. 84-inch Interplant pipe (in the vicinity of the pipe rack / screen wall)

3. 66-inch Primary Effluent pipe (in the vicinity of the pipe rack / screen wall)

4. Twin 60-inch Secondary Effluent pipe (Abandoned) (in the vicinity of the pipe rack / screen wall)

B. The CONTRACTOR shall submit reports and drawings demonstrating how the pipelines and conduit crossing the Tunnel 32 corridor will be protected in place and maintained in operation during the construction of Tunnel 32.

C. CONTRACTOR shall submit shoring design submittals in accordance with the requirements of Specification section 02200, Earthwork for the shoring located along the following facilities:

1. 72-inch Trickling Filter Effluent pipe

2. Tunnel 17

3. Digesters 9 and 10

D. CONTRACTOR shall submit a plan for protecting the TFE pipe during access to the Thickening and Dewatering Facility for shoring, excavation and placement of materials and equipment.

1.4 WORK BY OTHERS

A. OCSD, ENGINEER, utilities, and others may be working within the project area while the Work is in progress. If so, the CONTRACTOR shall schedule its work in conjunction with these other organizations to minimize interference with any of them.

B. Refer to the GENERAL REQUIREMENTS, sections entitled “Construction Access and Coordination” and “Concurrent Work Under Separate Contract”, for additional information related to this Section.

1.5 RESPONSIBILITY OF CONTRACTOR

A. If any part of the Work depends, for proper execution or results upon the work of others, the CONTRACTOR shall inspect and promptly report to the ENGINEER any apparent discrepancies or defects in such work of others that render it unsuitable for such proper execution and results. Failure of the CONTRACTOR to do so shall constitute an acceptance of the work by others as fit and proper except as to defects which may develop in the work of others after execution of the Work by the CONTRACTOR.

1.6 PROJECT COORDINATION

A. The CONTRACTOR shall be responsible for the coordination of all Work performed under these Contract Documents; including scheduling of all Work, delivery of equipment and materials, establishing the Work sequence, and completion of the Work in accordance with the construction schedule and the specified Time for Completion.

B. The CONTRACTOR shall be responsible for the division and coordination of all work performed by Subcontractors. Contracts between the CONTRACTOR and Subcontractors shall completely describe the work to be performed by each Subcontractor, and the division of work between trades or crafts will be solely a matter for agreement between the CONTRACTOR and its employees or Subcontractors. Based on the Critical Path Method (CPM) construction schedule prepared in accordance with the Contract Documents, the CONTRACTOR shall obtain from each of its subcontractors a similar schedule and shall be responsible for all parties maintaining these schedules, or for coordinating required modifications.

PART 2 - PRODUCTS (NOT USED)

PART 3 - EXECUTION

3.1 PROGRESS MEETINGS

A. The ENGINEER shall schedule and hold regular progress meetings at least once each week and at other times as required by progress of the Work.

B. The purpose of the meetings will be to review the progress of the Work, maintain coordination of efforts, discuss changes in scheduling, and resolve other problems that may develop. The meetings shall be attended by the CONTRACTOR's superintendent and the ENGINEER. Attendance by representatives of the CONTRACTOR's suppliers, manufacturers, and other subcontractors, may be requested by the ENGINEER or the CONTRACTOR.

C. The ENGINEER shall preside at the meetings and provide for keeping and distribution of the minutes.

D. Other meetings may be held to discuss matters relative to the Work and its performance at the request of the CONTRACTOR or the ENGINEER.

E. The CONTRACTOR and appropriate subcontractors and/or suppliers shall participate in quarterly, full day planning sessions with the ENGINEER to coordinate the work.

3.2 COORDINATION WITH OTHER CONTRACTORS

A. The CONTRACTOR shall inform the ENGINEER, and all other parties with an interest in this Project concerning its construction schedule and shall coordinate its Work with that performed by others. The CONTRACTOR shall make all necessary arrangements concerning the timing, methods, and division of work required by any connections between this Work and other work to be performed by others.

B. It shall be the duty of the CONTRACTOR of this project to coordinate with the contractors of other adjacent projects under construction to avoid any delays or inconvenience to any project. The CONTRACTOR’s attention is directed to the fact that other contractors will be working in the areas where work under this Contract is being performed. The following list includes known projects that will occur concurrent to the CONTRACTOR’s work. The list is provided for the CONTRACTOR’s convenience, however does not relieve the CONTRACTOR’s responsibilities to coordinate with other projects not listed herein.

Project Description	Start Construction Date	Anticipated End Construction Date	Project Areas
Job No. P1-102: Secondary Activated Sludge Facility 2	March 2009	April 2011	See Attachment A
Job No. P1-100: Sludge Digester Rehabilitation at Plant No. 1	April 2010	September 2013	See Attachment A
Job No. J-109: Cengen Cooling Water S ystem Replacement Project	October 2011	December 2013	See Attachment A
Job No. J-106: Interplant Gas Line Rehabilitation	March 2012	April 2013

Project Description	Start Construction Date	Anticipated End Construction Date	Project Areas
Job No. J-71-8: Rehabilitation of Odor Control Facilities	October 2012	February 2015	See Attachment A
Job No. P1-112: Plant Water System Rehabilitation at Plant 1	January 2013	July 2014
Job No. J-33-3: Power Monitoring and Control Systems	August 2011	November 2014	See Attachment A
Job No. J-36-1: Joint GWRS Microfiltration Backwash Redirection	July 2013	October 2016
Job No. P1-113: Trickling Filter Covers and Odor Control	August 2014	January 2016
Job No. P1-115: Title 24 Access Compliance and Building Rehabilitation	May 2013	January 2018

3.3 RELATIONS WITH OTHER CONTRACTORS

A. The CONTRACTOR shall cooperate with all other contractors who may be performing work on behalf of OCSD and workers who may be employed by OCSD on any work in the vicinity of the Work to be done under this Contract, and it shall so conduct its operations so as to interfere to the least possible extent with the work of such contractors or workers. The CONTRACTOR shall promptly make good, at its own expense, any injury or damage that may be sustained by other contractors or employees of OCSD, as a result of actions or lack of action by the CONTRACTOR.

B. Any difference or conflict which may arise between the CONTRACTOR and other contractors or between the CONTRACTOR and workers of OCSD in regard to their work shall be adjusted as determined by the ENGINEER. If the Work of the CONTRACTOR is delayed because of any acts or omissions by any other contractor, the CONTRACTOR shall have no claim against OCSD on that account other than an extension of time.

3.4 EXISTING STRUCTURES, PIPELINES AND CONDUITS A. General:

1. The dimensions and elevations of existing structures and locations of existing foundations, pipelines, conduits, cables, and equipment indicated on the Drawings were taken for the most part from OCSD's records of the existing wastewater treatment facilities and are not guaranteed for accuracy.

2. It shall be the responsibility of the CONTRACTOR to check all dimensions and elevations of existing structures, foundations, pipelines, conduits, cables, equipment, or other existing items, both above and below ground, affected by or affecting the Work under this Contract, prior to the start of construction or the ordering of materials and equipment affected thereby.

3. The CONTRACTOR shall be solely responsible for determining and bearing the cost of all removal and salvage operations.

B. Tunnel 17:

1. Tunnel 17 runs parallel to the north wall of the Thickening and Dewatering Facility. This tunnel was built in 1964 and is not supported on piles. CONTACTOR shall use caution during all construction activities to avoid damage to Tunnel 17.

2. To minimize potential damage to Tunnel 17, CONTRACTOR shall locate shoring for the Thickening and Dewatering Facility as far as possible from the south wall of Tunnel 17 and shall use a shoring system that will not damage this tunnel during installation.

3. The shoring system installed parallel to Tunnel 17 shall be left in place, except for the top four (4) feet below final grade, which shall be removed. The north wall of the Thickening and Dewatering Facility shall be poured against the shoring.

C. Trickling Filter Effluent Pipeline:

1. The 72-inch diameter Trickling Filter Effluent (TFE) RCP pipeline is located on the west and south side of the Thickening and Dewatering Facility. This pipeline was installed in 2004. Plan and profile drawings for the pipeline are provided as attachments to the Contract Documents.

2. Prior to beginning any excavation, pipeline demolition or pile installation in the vicinity of the TFE pipeline, CONTRACTOR shall perform extensive pot holing along the length of the TFE from Tunnel 17 to the Trickling Filter Secondary Effluent Junction Box No. 2. The pot holing shall be sufficient to clearly establish the outside edges of the pipe on both sides and the pipe profile for the entire pipe length. The CONTRACTOR shall survey the pothole locations and prepare a map and report documenting the location of the pipe.

3. CONTRACTOR shall prepare a pile installation drawing for the Thickening and Dewatering Facility and Solids Scrubbers, showing the horizontal and vertical coordinates of each pile and their relation to the TFE pipe. If any piles are found to be closer than 2 feet-0 inches to the edge of the TFE pipe (edge to edge horizontal distance), CONTRACTOR will consult with ENGINEER to adjust the pile location. ENGINEER must accept final pile configuration plan before pile installation can begin.

4. To minimize potential damage to the TFE pipe, CONTRACTOR shall locate shoring for the west wall of the Thickening and Dewatering Facility as far as possible from the TFE pipe and shall use a shoring system that will not damage the pipe.

5. The shoring system installed along the west wall of the Thickening and Dewatering Facility shall be left in place, except for the top four (4) feet below final grade, which shall be removed. The west wall of the Thickening and Dewatering Facility shall be poured against the shoring.

6. CONTRACTOR shall develop a plan for protecting the TFE pipe from damage due to cranes, earth-moving equipment and other construction activities needed to perform for shoring, pile installation, excavation and placement of materials and equipment at the Thickening and Dewatering Facility

D. Digester Nos. 9 and 10:

1. Tunnel 29 shall be constructed between Digester Nos. 9 and 10. These tanks were built in 1979 and are supported on piles. The District is concerned about potential damage to the digesters due to undermining.

2. To minimize potential damage to Digester Nos. 9 and 10, CONTRACTOR shall locate shoring for Tunnel 29 as far as possible from the digester walls for approximately 20 feet to either side of the centerline between Digester Nos. 9 and

10, CONTRACTOR shall use a shoring system that will not damage the digesters during installation.

3. The shoring system installed along Tunnel 29 shall be left in place for approximately 20 feet to either side of the centerline between Digester Nos. 9 and

10, except for the top four (4) feet below final grade, which shall be removed. In this

40 foot section, the north and south walls of Tunnel 29 shall be poured against the shoring.

E. Pipelines Along Pipe Rack / Screen Wall Alignment:

1. The pipe rack / screen wall will cross or be in close proximity to 1) an 84” Interplant pipe, 2) a 66” Primary Effluent pipe and 3) two 60” Secondary Effluent pipes. The 84” and 66” pipes are in service. The 60” pipes are abandoned.

2. Prior to beginning any excavation, pipeline demolition or pile installation in the vicinity of the four pipelines, CONTRACTOR shall perform extensive pot holing of these pipelines between Stations 3+50 and 6+00 of the pipe rack. The pot holing shall be sufficient to clearly establish the outside edges of the pipes on both sides and the pipe profiles in the area of the proposed pile installation. The CONTRACTOR shall survey the pothole locations and prepare a map and report documenting the location of the pipes.

3. CONTRACTOR shall prepare a pile installation drawing for all facilities in the vicinity of four pipes, showing the horizontal and vertical coordinates of each pile and their relation to the pipes. If any piles are found to be closer than 1-foot-0 inches to the edge of the pipes (edge to edge horizontal distance), CONTRACTOR will consult with ENGINEER to adjust the pile location. ENGINEER must accept the final pile configuration plan before pile installation can begin.

F. Pipelines Crossing Tunnel 32:

1. The following pipelines and electrical conduits must be protected in place and remain in service during construction of Tunnel 32:

a. 16-inch Steel High Pressure Digester Gas 

b. 12-inch Steel High Pressure Digester Gas 

c. 3-inch Steel Natural Gas

d. 1-1/2-inch Electrical Conduit

2. Prior to beginning excavation, shoring or pipeline demolition in the vicinity of Tunnel 32, CONTRACTOR shall prepare a plan and drawings demonstrating how these pipes and conduits will be supported and protected throughout construction of Tunnel 32. ENGINEER must accept the pipe and conduit protection plan before any work in this area can begin.