There is an inspection report prepared after the Digester cleaning was carried out.

Transcription

1 TERMS OF REFERENCE FOR CONSTRUCTION MANAGEMENT AND INSPECTION FOR THE REPAIRS AND GASPROOFING OF DIGESTER NO.2 AT THE GUELPH WASTEWATER TREATMENT PLANT BACKGROUND The work generally consists of Repairs and Gas proofing, obtaining TSSA approval and commissioning the Digester No.2 at the Guelph Wastewater Treatment Plant (WWTP), in Guelph, Ontario. Tender documents for the Repairs and Gas proofing to the Digester No.2 can be found on the City s website under contract number There is an inspection report prepared after the Digester cleaning was carried out. LOCATION OF THE WORK The Guelph WWTP is located at 530 Wellington Street South, Guelph, Ontario, Canada. GENERAL SCOPE OF WORK: Construction management resident Inspector (CMRI) from Main Consulting Engineering firm and Gas proofing site inspection (GPSI) This will include but not be limited to: Provide part time on-site inspection services for main consultant and full time inspection of Gas proofing inspector. The main Consulting Engineering firm shall have minimum of 3-4 Digester construction projects experience. CMRI, with directly related relevant experience with a minimum of 3-4 years on wastewater treatment projects and 1-2 Digester projects will be necessary Sub contract a 3 rd party independent gas proofing inspection company with minimum of 3-5 years experience in Digester gas proofing projects for Municipalities and able to provide their staff with NACE certification and with a minimum of 2-3 years experience of inspecting gas proofing projects for Municipalities. Qualification and experience details shall be provided with the bid as it will be used for evaluation purposes as-well. Owner will designate CMRI as owners representative when referred to as owner/client/city in the contractor s tender document attached. Maintain written record of site works progress. Maintain a detailed photographic record of site works progress. Provide digital progress photographs of major project milestones complete with title and date on a monthly basis. Arrange to provide by-weekly reports TR1

2 on works. Prepare and implement procedures for timely delivery of documents etc from contractor to client inorder to avoid delays. Establish roles and responsibilities for all stakeholders. Verify that work is carried out to the contract document and contractors proposal. Review and approve shop drawings. Identify deficiencies and prepare list. Perform structural and mechanical inspection and condition assessment before and after the scaffolding has been installed and before and after coating is removed. Prepare and submit list of additional repairs or replacement and recommend works and materials etc that will have to be included as may be necessary. Where change order will be necessary, evaluate the contractor s quotes and recommend to the client if the rates are adequate considering current market rates etc. Review and approve contractor s plan of works, schedule and spills plan. Review contractors hot work permit and confined space entry in comparison to Cities and coordinate with City and Contractor to finalize on the approach for the project. Support and advice owner for the activity related to the project. Co-ordinate and arrange for TSSA approval prior and after works based on TSSA requirements. Review, evaluate and certify contractors progress payment for client approval, where necessary. Consultant shall be responsible for review and approve contractor s proposal for gas proofing and associated works as in the contractor s scope and review the warranty. Check and ensure that all testing, calibration and manufacturers start-up reports, all maintenance information, and all other associated documentation are included in the O&M manual. Provide client with report of deficiencies with cost estimate prior to issuing Substantial Completion Certificate. TIME FOR COMPLETION FOR THE CONTRACT FOR CONTRACTOR The City anticipates that Repairs and Gas proofing of the Digester will take approximately 30 weeks including the gas tightness test. Scope of work for Construction management resident Inspector (CMRI) In order to successfully fulfill the objectives of the assignment, active involvement from the inspector will be required. The role of the CMRI for the consultant team will include but not be limited to: Acting as the main contact person between the consultant firm and the Wastewater treatment plants project manager to ensure timely and accurate communication. Developing and facilitating the meetings with all key stakeholders. ensuring a high quality of work and approving shop drawings as necessary in a timely manner Review the contractors staging area and recommend any reinstatement etc Ensuring the consultant team resources is appropriately utilized and budgets managed during all aspects of the assignment. playing a significant role in presenting information and responding to questions during the progress of works The site inspector shall meet with City Project Manager when necessary but not TR2

3 less than twice per month during all stages of the assignment. Prepare and distribute meeting agendas and all information to be reviewed at the meeting not less than 3 business days prior to the meeting. Prepare and distribute summaries of the meetings not more than 3 working days after the meeting. Develop procedures etc as may be necessary to be able to control/manage the project All other related works as in this document and based on the attached contractor s tender document. Proactive approach to mitigate any possible spills, quantifying for payment to contractor, monitoring hours spent by consultants staff and their subs etc. Co-ordinate staff for inspection in a timely manner and provide reports to client If staff proposed in bid is not available for the project, provide resumes and rates for the new staff for City approval. City reserves the right to approve/disapprove the staff for the project. Witnessing Testing and commissioning Scope of work for Gas proofing site Inspection Company for inspection and testing services (GPSI) Inspection of Gas proofing Surface Preparation and Coating Application Supply all labour, materials, and equipment necessary to carry out the inspection and testing services described below. The general work shall include but not be limited to review and approve contractors proposal/shop drawings for gas proofing, Inspection of gas proofing surface preparation and coating application. Inspect the surface preparation of the concrete substrate for compliance with Specification Section Notify the Contract Administrator s resident inspection staff when all surface preparation has been successfully completed. Witness and inspect the application of the gasproofing coating for compliance with Specification Section Inspect the gasproofing surface preparation and coating application and submit written reports in accordance with Section Inspect the gasproofing coating before the end of the warranty period to evaluate the performance of the work, in accordance with Specification Section The approved gasproofing coating system selected by the contractor includes the following products: Concrete: 1. Surfacer: TBD 2. Primer: TBD TR3

4 3. Topcoat: TBD Field Quality Control.1 General Requirements:.1 All material and equipment furnished, and work done under this Section, shall be subject to inspection by skilled technical representatives to ensure that the surface preparation and coating installation work is executed in a manner that meets the application requirements specified in the Contract..2 Inspector s services will include the following:.1 Verify that coatings and other materials are as specified in the Contract and meet all quality parameters provided by the supplier..2 Verify that surface preparation and application are as specified in the Contract or by the coating manufacturer, whichever has the most stringent requirements. Verify that coverage and coating usage correspond with that specified in the Contract. This will be completed by monitoring the surface area coated and coating consumption..3 Coating Defects: Check coatings for film characteristics or defects that would adversely affect performance or appearance of coating systems..4 Report:.1 Submit weekly written reports describing inspections made and actions taken to correct nonconforming Work..2 Report nonconforming Work not corrected..3 Submit copies of report to the Engineer and the Contractor, at the end of each week..5 General A Quality Assurance Report should be completed by the Contractor for each of the operations. Conditions as noted in this Specification or required by the coating manufacturer shall be monitored and recorded on this quality assurance report. As a minimum it should record the environmental conditions, the identification of Work completed, visual examination results, and coating consumption, and the coverage readings for the Work completed that day. This report shall be made available to the Engineer or the City upon request. TR4

5 .6 Visual Examination The cured coating shall be generally smooth and free of sharp protrusions. It should not exhibit any cracking, blisters, off-ratio discolouring, sticky spots, uncovered areas or spots, pigment separation, and other defects due to improper application. Areas with these defects shall be repaired or recoated according to repair procedures as required by the coating manufacturer..7 Film Thickness.3 Work Stages:.1 Thickness determinations using a Type 1 or Type 2 thickness gauge shall be conducted in accordance with the SSPC-PA2 procedure..2 Mark areas where the required DFT has not been reached. These areas are subject to be recoated or repaired according to repair procedures as required by the coating manufacturer..3 Dry film gauges shall be calibrated a minimum of once per day in accordance with SSPC PA2..4 Dry film gauges shall be calibrated in the work area where they are to be used..5 All dry film readings of Type 1 gauges shall be reduced by the average magnetic base reading determined in accordance with SSPC PA2. This value shall be recorded on the Quality Assurance Report..6 Use ultrasound gauges to measure and confirm DFT as per SSPC PA-2..1 Specific inspections are required for each Work stage..2 The minimum number of critical stages requiring inspection is:.1 After abrasive blast cleaning to remove previously applied coating and after grouting voids..2 After application of surfacer and before commencement of coating application..3 During coating application the ambient conditions and wet film thickness readings should be monitored and confirmed to meet the project specifications. TR5

6 .4 Defective Work:.4 After application of coating. After each coating the film thickness should be checked, verified that each individual coat is ready to receive the next coat, and is within the manufacturer s stated recoat window and free of intercoat contamination. Observed imperfections such as pinholes, lack of adhesion, insufficient film thickness should be corrected as this point..5 Post curing: This hold point will verify that the final dry film thickness has been achieved. It will include a visual inspection of the coating for surface defects, and a verification that the coating has completely cured..6 After any repair: If the coating becomes damaged at any point, the coating should be repaired and the repair reinspected..1 The inspector shall be responsible to inform the Contractor where to repair or remove defective Work..2 Any repair Work required to remedy defective Work shall comply with the performance requirements of these Specifications in all respects. In the case of removal, the inspector shall ensure defective Work is replaced by materials conforming to this Specification GENERAL CLAUSES 1. Direction and Supervision Under the general direction of the CMRI, the Gas proofing inspection company shall provide personnel, materials, and equipment to perform the required inspections and tests for the entire construction work defined herein. A qualified professional shall instruct and supervise the testing and inspection personnel and correlate testing activities with design parameters and construction conditions. When required by job conditions, the qualified professional shall make site investigations and submit written reports of findings. Base costs on normal working hours, Monday to Friday 7:30 am to 4:30 pm. Do not include overtime or premium pay in the lump sum or unit price amounts. Matters pertaining to construction of the work will be handled by the CMRI. TR6

7 2. Standards Testing and inspection work shall be performed in accordance with the latest applicable ASTM, ACI, AISC, CSA, NACE, TSSA, or other recognized standard test procedures. 3. Owner s Rights The City of Guelph has the right, at any time, to approve or disapprove any person assigned to perform services. 4. Test Reports Immediately after performing tests or inspections, GPSI shall verbally inform the CMRI of test results and conclusions. A report shall be promptly submitted each week and shall be in a form approved by the City of Guelph and shall contain the following information:.1 Name of the project and its location..2 Name of organization and person(s) doing inspection or test..3 Name of Contractor or Subcontractor performing the work..4 Date the inspection or test was performed..5 Location of the materials tested within the project; i.e. identification of test area locations in relation to structure..6 Source of material inspected or tested; material production and delivery documentation..7 Type of test or inspection performed..8 Referenced Standards; i.e. CSA, ASTM, etc..9 Data collected..10 Name of person(s) writing the report..11 Date the report was written..12 Signatures of data collector(s) and report writer(s). Formats of test and inspection reports are to be submitted to and approved by the City of Guelph before commencing with actual testing and inspection. The test reports shall be sequentially numbered. Submit proposed format for approval. 5. Report Distribution The signed reports shall be submitted by the GPSI to the City of Guelph, the CMRI, within five (5) working days of the inspection or testing. 6. Schedule The anticipated schedule for the inspection and testing services, based on the general contractor s current construction schedule, is shown below. The schedule is TR7

8 approximate only and is subject to change. Digester: November 2013 May 2014 Provide the following for City to Review Proposals Qualification & Experience Evaluation of relevant qualifications and expertise of assigned staff and sub consultant staff members (Details of projects and staff involvement on the project should be provided. Staff should have adequate qualifications and training including confined space entry training) Methodology Should include the understanding and approach to the project and quality assurance and completeness References Provide at least three project references with a similar scope and type Where possible include at least one municipal reference. Describe the nature of the projects including budget, schedule, person resources and scope. The City reserves the right to contact other references than the ones submitted. TR8