SECTION SUMMARY OF WORK

Transcription

1 SECTION SUMMARY OF WORK PART 1--GENERAL 1.01 DESCRIPTION OF OWNER S FACILITY The East Central Regional Water Reclamation Facility (ECRWRF) provides secondary treatment of municipal wastewater for a service area that includes the City of West Palm Beach, the Town of Palm Beach, the City of Lake Worth, the City of Riviera Beach and portions of Palm Beach County. The ECRWRF is permitted for an average annual daily flow (AADF) of 70 million gallons per day (MGD) and currently receives an AADF of about 45 MGD. Wastewater flow enters the Headworks of the ECRWRF through three force mains, a 36-inch line delivering flow from the City of Riviera Beach, a 48-inch line delivering flow from the Town of Palm Beach and the City of West Palm Beach, and a 54-inch line delivering flow from the City of Lake Worth and Palm Beach County. The Headworks at the ECRWRF includes influent flow metering, influent screening, grit removal and associated odor control facilities. Much of the equipment in the Headworks has been in service for many years and is approaching the end of its useful life. Accordingly, portions of the Headworks are in need of rehabilitation and improvements as described herein. Influent flow meters (venturi and ultrasonic) are located in an open meter vault on each of the three influent force mains as they enter the Headworks structure. After metering, the wastewater flow from the three force mains is combined in a mixing chamber and enters a common channel that allows the combined flow to be distributed to five influent screen channels. The existing screens are Parkson AquaGuard continuous element bar screens. Manually operated gates at the upstream and downstream ends of each screen channel allow for isolation of individual screens if necessary. Should water elevations in the screen channels rise above a preset elevation, an automatically operated gate opens allowing flow to enter a sixth screen channel with a manually operated screen. Screenings collected on the screens are compacted and conveyed to an adjacent Screenings Building by means of a shaftless screw conveyor. After passing through the influent screens, the wastewater flow is again combined into a common channel for conveyance to the grit removal units. There are two parallel, forced vortex grit removal units, each with a rated capacity of 70 MGD. Gates on the influent and effluent channels allow each vortex grit removal unit to be isolated if necessary. Grit collected in the vortex units is pumped to two grit cyclone/classifier units where it is settled out and dewatered. The dewatered grit discharges by gravity into a storage container below. After passing through the two grit removal units, wastewater flow is combined, exits the Headworks over a set of gated weirs, and is conveyed to the aeration basins for biological treatment. Bypassing of the Headworks is accomplished by diverting wastewater flow to a bypass structure, located to the south of the Headworks. The bypass structure contains manual bar Summary of Work Headworks and Grit Removal Improvements 4/18/2017

2 screens that collect debris entering the plant and discharges flow directly to the aeration basins for biological treatment. The manual screens must be kept clean while bypassing occurs to prevent overflows from occurring. All three of the wastewater force mains delivering flow to the ECRWRF are connected to this bypass structure. No additional bypass pumping is required. It is also possible to bypass both grit removal units and deliver wastewater flow directly to the aeration basins after influent screening. However, it is not possible to bypass the flow meters and influent screens as separate process areas in the same way. Additionally, the Headworks includes an odor control system consisting of foul air collection, foul air piping from various channel locations, and a chemical scrubber. Improvements to this system are not part of this project; however, some foul air piping will require relocation and all foul air piping will be re-coated DESCRIPTION OF WORK A. Provided below is a general description of the Work to be performed in this project. It is not intended to be a detailed accounting of all Work required, but rather a summary of the primary project components. The complete Work is provided comprehensively in these Contract Documents. 1. Influent Flow Meters Residual solids removal from the Mixing Chamber and Influent pipe. Demolition of the existing venturi meters, ultrasonic insertion meters, piping and appurtenances in the meter vault. Installation of new 36-inch, 48-inch, and 54-inch venturi meters, piping, electrical and SCADA connections, and other appurtenances to replace the existing. Repairs to two existing drainage sumps in the meter vault; removal of the two existing sump pumps and replacement with new sump pumps. 2. Influent Screens Residual solids removal from the screenings channels and basins. Demolition and removal of the five existing continuous element bar screens and compactors, shaftless screw conveyor, and associated piping, above ground electrical conduit, electrical panels and controls; Modification to the bottoms of two screen channels to accommodate the new screen configuration; Rehabilitation, surface preparation and re-coating of all influent screen channels; Installation of five new 6-mm automatic perforated plate, center flow band screens with integrated washer/compactors and associated piping, valving, electrical panels, instrumentation and controls; Installation of new odor control covers and access hatches over the influent screen channels; Summary of Work Headworks and Grit Removal Improvements 4/18/2017

3 Installation of a new shaftless screw conveyor; Re-coating and relocation of certain above grade foul air piping; 3. Grit Removal Units Residual solids removal from the grit removal units, channels, and basins Demolition and removal of the two existing grit pumps and cyclone/classifiers, and associated piping, above ground electrical conduit, electrical panels and controls. Note: the two existing forced vortex grit removal units were recently replaced and are to remain; Removal and replacement of the four manually operated isolation gates in the influent and effluent channels for the two grit chambers; Rehabilitation, surface preparation and re-coating of the interiors of the two grit chambers and the interior concrete surfaces of all channels conveying flow to and away from the two grit chambers, including the bypass channel and distribution chamber. Note: the existing forced vortex grit removal units will need to be removed prior to rehabilitation work in the grit chambers and replaced after the rehabilitation work is completed. Installation of new grit pumps, new cyclone/classifiers, and associated piping, valving, electrical panels, instrumentation and controls; Installation of new odor control covers and access hatches over the grit removal channels; Installation of new handrail on and around the grit removal portion of the Headworks Structure at locations shown on the Drawings; Relocation and recoating of certain above grade foul air piping. 4. Civil/Site Improvements Demolition and removal of the existing Screenings Building and construction of a new Screenings Building; Demolition of existing asphalt pavement and construction of hardened concrete pads and new asphalt pavement in the vicinity of the new Screenings Building; Miscellaneous yard piping improvements; Miscellaneous grading and drainage improvements; 5. Electrical Improvements Demolish and remove all wire, raceway control panels, supports lighting, receptacles, switches, etc. associated with the existing Screening and Grit Structures including influent flow meters, bar screens, instruments, grit drive, grit classifier, grit pumps complete. Modify existing feeder breakers in USS 2A and USS 2B, including feeder conductors to MCC 2A and MCC 2B as described in the drawings and specifications Summary of Work Headworks and Grit Removal Improvements 4/18/2017

4 Modify existing main breakers in MCC 2A and MCC 2B as described in the drawings and specifications. Modify MCC cubicles in MCC 2A and 2B as described in the drawings and specifications complete in place. Demolish and remove existing feeder circuits from Headworks DP to existing bar screens as described in the drawings complete in place. Furnish and install all electrical systems associated with the new influent flow meters as described in the drawings and specifications complete in place. Furnish and install all electrical systems associated with the new band screens as described in the drawings and specifications complete in place. Furnish and install all electrical systems associated with the screenings conveyor as described in the drawings and specifications complete in place. Furnish and install all electrical systems associated with instrumentation and control systems as described in the drawings and specifications complete in place. Furnish and install all lighting, grounding/bonding and convenience power systems described in the drawings and specifications complete in place. Furnish and install all electrical systems associated with the new grit separator/drive unit as described in the drawings and specifications complete in place. Furnish and install all electrical systems associated with the new grit pumps as described in the drawings and specifications complete in place, Furnish and install all miscellaneous starters and control panels as described in the drawings and specifications complete in place. 6. Instrumentation and Control Improvements Demolish and remove existing influent flow meters and install new influent flow meters as described in the drawings and specifications complete in place. Demolish and remove the existing in-line influent magnetic flow meters and discard. Furnish and install new sump pump control panels as described in the drawings and specifications complete in place. Demolish and remove all instruments associated with the existing bar screens complete in place. Demolish and remove existing ultrasonic level transmitters on the influent screen distribution channel and the existing grit removal influent channel and replace with new ultrasonic level transmitters as described in the drawings and specifications complete in place. Install vendor furnished instruments associated with the new influent screens, grit removal units, grit classifier and grit pumps complete in place. Perform all terminations in existing PLC 1 (Effluent Pump Station) for replacement of existing signals (and wiring) and additions of new signals and wiring Summary of Work Headworks and Grit Removal Improvements 4/18/2017

5 Perform PLC programming to support control strategies described in the drawings and specifications complete in place WORK COVERED BY CONTRACT DOCUMENTS The Contractor shall furnish all labor, materials, equipment, tools, services and incidentals to complete all Work required by the Contract. The Contractor shall perform the Work complete, in place and ready for continuous service, including any repairs, replacements and restorations required as a result of damage caused by Contractor during this construction. The Work shall be provided complete with all demolition and relocation of existing facilities; all temporary structures, piping, pumping, power and control facilities required to maintain continuous plant operation; all concrete, support piping and equipment, electrical power, control and lighting; instrumentation; architectural items; painting; and dewatering, demucking, excavation, backfill, grading, paving, fencing and landscaping as shown and specified and shall include all specified delivery acceptance tests and inspections, installed tests and inspections, and operational testing, training and commissioning. Contractor shall provide all supplies, manufactured articles and transportation and services, including fuel, power, water, and essential communications, costs and operations for permitting, dewatering, storage, temporary fencing and facilities, equipment for demolition, disposal, maintenance of operation during construction, interconnections to existing plant and utility facilities and bypassing, start-up and testing, restoration (normal not just from damages), operation and maintenance manuals, record documents, spare parts, test equipment, and all other appurtenances and miscellaneous items required for completion of the Work in accordance with the Contract Documents. The Work shall be complete, and all Work, materials, and services not expressly shown or called for the Contract Documents which may be necessary for the complete and proper construction of the Work in good faith shall be performed, furnished, and installed by the Contractor as though originally so specified or shown, at no increase in cost to the Owner. Contractor shall provide all third party resident inspection services required by the City of West Palm Beach Building Department, as outlined under permit no for the existing Headworks Structure. Contractor shall provide all third-party materials testing required in the Contract Documents. Prior to construction, the Contractor shall verify existing utilities identified on the Drawings. The utility verifications shall consist of excavation to verify tie-in points and to locate potential conflicts that may affect the Work as shown on the Drawings. The Contractor will be responsible for coordination of the Work with the Owner, associated Utility, and permitting agencies having jurisdiction over the specified locations to be verified Summary of Work Headworks and Grit Removal Improvements 4/18/2017

6 The Work to be done is shown on the Contract Documents (Drawings and Specifications) entitled East Central Regional Water Reclamation Facility Headworks and Grit Removal Improvements. The numbers and titles of all Drawings appear on the index sheet of the Drawings. All drawings so enumerated shall be considered an integral part of the Contract Documents as defined herein. Certain document sections refer to Divisions of the Contract Specifications. Sections are each individually numbered portions of the Specifications such as 08110, 13182, 15206, etc. The term Division is used as a convenience term meaning all Sections within a numerical grouping. For example, Division 16 would thus include Sections through and would mean all electrical specifications. Drawings indicate the extent and general arrangement of the Work. If any departures from the Drawings are deemed necessary by the Contractor to accommodate the materials and equipment he proposes to furnish, details of such departures and reasons therefore shall be submitted prior to the completion of Milestone 1 to the Owner for approval. No such departures shall be made without the prior written approval of the Owner. Approved changes shall be made without additional cost to the Owner. The specific equipment proposed for use by the Contractor on the project may require changes in structures, auxiliary equipment, piping, electrical, mechanical, controls or other work to provide a complete satisfactory operating installation. The Contractor shall submit to the Owner, for approval, all necessary Drawings and details showing such changes to verify conformance with the overall project structural and architectural requirements and overall project operating performance. The Bid Price shall include all costs in connection with the preparation of new drawings and details and all changes to construction work to accommodate the proposed equipment. In the event that the Engineer is required to provide additional engineering services as a result of substitution of materials or equipment which are not "or equal" by the Contractor, or changes by the Contractor in dimension, weight, power requirements, etc., of the equipment and accessories furnished, or if the Engineer is required to examine and evaluate any changes proposed by the Contractor for the convenience of the Contractor, then the Engineer's charges in connection with such additional services shall be charged to the Contractor by the Owner. Structural design shown on the Contract Drawings is based upon typical weights for major items of equipment as indicated on the Contract Drawings and specified. If the equipment furnished differs from that specified in the Contract Documents such that actual weight exceeds the weight of specified equipment, the Contractor shall assume the responsibility for all costs of redesign and for any construction changes required to accommodate the equipment furnished, including the Engineer's expenses in connection therewith, provided that the original weight assumptions were correct. In the event that the Engineer is required to provide additional engineering services as a result of Contractor's errors, omissions, or failure to conform to the requirements of the Contract Documents, or if the Engineer is required to examine and evaluate any changes proposed by the Summary of Work Headworks and Grit Removal Improvements 4/18/2017

7 Contractor solely for the convenience of the Contractor, then the Engineer's charges in connection with such additional services shall be charged to the Contractor by the Owner and shall be deducted from monies due the Contractor. In the event the Work of this Contract is not completed within the time set forth in the Contract or within the time to which such completion may have been extended in accordance with the Contract Documents, the additional engineering or inspection charges incurred by the Owner may be charged to the Contractor and deducted from the monies due him. Extra work or supplemental Contract work added to the original Contract, as well as extenuating circumstances beyond the control of the Contractor, will be given due consideration by the Owner before assessing engineering and inspection charges against the Contractor. Charges for any additional Owner expenses shall be independent of any liquidated damages assessed in accordance with the Contract. The Work includes interim milestones. (i.e. phases of work to control the Contractor s progress, schedule and sequence) as defined in these Contract Documents. One milestone of particular importance is Milestone 1 Permits and Submittal Approval. Milestone 1 requires the Contractor to provide certain submittals and receive approval for permits and certain shop drawings within 90 calendar days upon receipt of Notice to Proceed from the Owner. The Sequence of Construction and Overall Project Completion Schedule are presented in Sections and 01011, respectively. Substantial and Final Completion of the overall contract requirements are also subject to Liquidated Damages per Section 19 of the General Conditions. In the event the Work of this Contract is not completed within the time set forth in the Contract or within the time to which such completion may have been extended in accordance with the Contract Documents, the additional Engineering or inspection charges incurred by the Owner may be charged to the Contractor and deducted from the monies due. The Contractor shall perform a field location investigation of the existing underground utilities and facilities in accordance with Section Protection of Existing Facilities, shall have provided requirements, plans and schedules in accordance with Section Submittals and shall have obtained all required permits, permissions and approvals prior to commencing with the Work. At no time shall the Contractor undertake to close off any pipelines, open any valves, or take any other action that could affect the operation of existing systems, except as specifically required by the Contract Documents, until after authorization is granted by the Owner and after proper notification and coordination has been provided. Contractor shall provide prior written notification to Owner for any temporary disruption of service Summary of Work Headworks and Grit Removal Improvements 4/18/2017

8 PART 2--PRODUCTS (NOT USED) PART 3--EXECUTION (NOT USED) **END OF SECTION** Summary of Work Headworks and Grit Removal Improvements 4/18/2017

9 SECTION SEQUENCE OF WORK PART 1--GENERAL 1.01 CONTINUITY OF PLANT OPERATIONS A. GENERAL: The ECRWRF must continue to treat wastewater flow during performance of the Work and comply with the effluent limitations established in its FDEP discharge permit. The Contractor shall review and understand the performance requirements of the operating permit for the plant (FDEP Operating Permit No. FLA041360) B. BYPASSING: Bypassing of the Headworks, either in part or in its entirety, will be required during portions of the project. Bypassing can occur in one of two ways as follows: 1. Bypassing of the Headworks in its entirety, by directing raw wastewater flow to the existing Influent Bypass Structure located south of the Headworks. All three influent force mains are connected to this structure. No additional pumping is required. 2. Bypassing of screened influent wastewater flow around the grit removal units. Flow can be directed to either the Flow Equalization Basin or Aeration Basin #5, as directed by ECRWRF staff, by the positioning of manually operated grit chamber isolation gates and control gates in the grit chamber bypass channel. Bypassing of raw or screened influent wastewater to any location other than the Flow Equalization Basin or Aeration Basin #5 is prohibited. The Contractor shall coordinate his plan and schedule for bypassing with ECRWRF staff well in advance of implementation to minimize impacts to plant operations and performance. Coordination procedures are specified in Section SEQUENCE OF CONSTRUCTION A. PHASES OF WORK The Work is divided into three major phases as generally described below. The Contractor shall perform the Work sequentially, by phase, unless authorized otherwise by the Owner and Engineer Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

10 1. Phase 1 All pre-construction activity associated with Phase 2 of the Project including the following: a. Obtaining of all required approvals and permits; b. Approval of all submittals, including a detailed Sequencing Plan for Phase 2 work; c. Ordering of all equipment needed for completion of Phase 2 work and delivery to the Project site; d. Mobilization of construction equipment and subcontractor resources required for Phase 2 work to the Project site. It is assumed that the Headworks Structure will be bypassed in its entirety during Phase 2 construction work. Therefore, it is intended that Phase 1 work include those pre-construction activities required to complete Phase 2 work in as short a time as possible to minimize the time duration required for bypassing of the Headworks Structure. 2. Phase 2 Construction of flow meter and influent screen improvements and Phase 3 pre-construction activity, including the following: a. Staffing of the Influent Bypass Structure while the Headworks is being bypassed. b. Draining by Owner and cleaning by Contractor of the Headworks Structure to allow for inspection by Owner and preparation of construction activities by Contractor. c. Removal and replacement of influent flow meters and other improvements in the existing meter vault. d. Refurbishment and re-coating of influent screen channels, grit chamber conveyance channel and other common grit chamber channels. e. Removal and replacement of grit chamber isolation gates. f. Removal and replacement of influent screens, including modification of screen channels, and associated piping and appurtenances, electrical connections and instrumentation/controls. g. Removal and replacement of odor control covers in influent screen channels, grit chamber conveyance channel and other common grit chamber channels Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

11 h. Demolition of existing Screenings Building and construction of new Screenings Building, including concrete pads for unloading screenings storage bins. i. Removal and relocation of foul air piping associated with the influent screens and Screenings Building. j. Preparation and approval of all submittals for Phase 3 construction work that were not approved during Phase 1. Inspection of the interior concrete surfaces immediately following the Headworks being taken off-line will allow for determination of the extent of structural rehabilitation work required in Phases 2 and 3. This may result in an additive or deductive Change Order to the Contractor if the amount of rehabilitation is substantially more or less than that reflected on the Contract Drawings and on the Bid Form. 3. Phase 3 Construction of grit removal improvements, including the following: a. Rehabilitation and re-coating of the interior concrete surfaces in the grit chambers and grit chamber influent/effluent channels. b. Removal and replacement of forced vortex grit removal units, grit pumps, grit cyclone/classifiers, and associated piping, appurtenances, electrical connections and instrumentation/controls. c. Relocation of any foul air piping not relocated during Phase 2 and all required recoating of foul air piping. d. Paving, grading and drainage improvements not completed during Screenings Building construction in Phase 2. B. CONSTRUCTION SEQUENCE Required completion times for each phase of the Work, and specific milestones within each phase, are presented in Section Paragraph provides the Contractor with particular constraints regarding particular process areas. It is the Contractor s responsibility to sequence his work within each phase to meet these completion times, recognizing the constraints identified in Paragraph The Contractor shall not be allowed to deviate from the defined constraints in Paragraph In accordance with these Contract Documents, the Contractor shall submit detailed maintenance of plant operations (MOPOs) for all tasks which will make it necessary to remove a pipeline, channel, electrical circuit, equipment or structure from service prior to beginning any related construction activity. Reference Section and Section Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

12 In addition to the detailed MOPOs required under Section 01040, the Contractor shall provide an overall detailed Project Sequencing Plan submitted in accordance with Section 01300, coordinated with the Project Schedule required under Section 01310, and which meets the requirements of these Contract Documents. The Project Sequencing Plan shall include: 1. Detailed description of the Contractor s methods and sequencing of operations and work, 2. Length of time required to complete each individual operation, 3. Equipment which the Contractor shall provide, 4. Required resources from the Owner, 5. List of deviations and/or exceptions from the sequence and schedule presented in the Contract Documents along with a detailed explanation for why the deviation is required and or justified. PART 2--PRODUCTS (NOT USED) PART 3--EXECUTION 3.01 CONSTRAINTS A. GENERAL: Specific issues that must be addressed by the Contractor in the execution of the work for individual process areas are summarized here. These issues do not relieve the Contractor from evaluating each phase of work in each process work area in accordance with the Contract Documents and determining for himself any specialized issues relevant to performance of the Work. Actual sequencing and scheduling of the Work and the means and methods by which the Work is performed are the responsibility of the Contractor. The Contractor is entirely responsible for ensuring that these constraints are upheld during the progression of the Work. 1. The Contractor shall provide ECRWRF operation and maintenance personnel access to all areas of the Headworks Structure at all times that it is operational, either fully or in part. This includes access to the grit storage containers on the west side of the Headworks Structure by the contract hauler servicing those containers. 2. During Phase 1, the Headworks Structure, and all process areas within it, must remain fully functional at all times. During Phase 1, no bypassing of the Headworks Structure may occur. With the approval of the Owner, the Contractor may perform site preparation activities external to the Headworks Structure during Phase 1 if such activities do not impact the operation and performance of existing flow metering, influent screening and grit removal processes in the Headworks Structure Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

13 3. During Phase 2, the ECRWRF Influent Bypass Structure must remain in operation at all times. The Influent Bypass Structure includes three 1-inch bar screen stations that require manual raking during use. During the period of time when the Influent Bypass Structure is operational, the Contractor shall provide the services of one or more trained laborers, 24 hours per day, 7 days per week, dedicated to the removal of screenings captured on these screens. The screenings will be stored in container(s) placed adjacent to the Influent Bypass Structure. ECRWRF operations personnel will remove the containers when they are full and replace them with empty containers. 4. During Phase 3, the Headworks Structure, must remain fully functional at all times recognizing that one of the two vortex grit removal units will be out of service during this time. During Phase 3, no bypassing of the Headworks Structure may occur. B. SPECIFIC PROCESSES: Sequencing issues associated with specific process areas include the following: 1. Flow Meters, Common Chambers, Channels, and Slide Gates Due to the configuration of the Headworks Structure, there is no way of isolating the flow meter vault, the common influent screen distribution channel, the common channel between the screens and the grit vortex units, common effluent chambers, or the grit vortex isolation slide gates without taking all screens and grit removal units out of service. Therefore, replacement of the flow meters, structural rehabilitation and installation of odor control covers and hatches in common chambers and channels, and replacement of the grit removal isolation gates cannot occur until bypassing of the Headworks Structure has begun. Following successful isolation of the Headworks Structure, the Owner will drain the bulk liquid from the isolated channels, basins, etc. The Contractor shall remove and disposed of any residual liquid and/or solids in the Headworks Structure including residuals in the Mixing Chamber immediately west of the Flowmeter Vault. 2. Influent Screen Channel Modifications and Influent Screens Structural modifications to the influent screen channels require that multiple screen channels be out of service at one time. Therefore, these channel modifications, including demolition of the existing screens, cannot occur until bypassing of the Headworks Structure has begun. Installation of the new influent screens cannot be completed until the channel modifications have been completed. However, it is possible that new screens could be installed sooner in channels that do not require modification if refurbishment and recoating of those channels has been performed. 3. Grit Removal System A single grit removal process train (grit vortex unit and associated, grit pump, cyclone, and classifier) may be taken out of service at a time to perform structural refurbishment and recoating of concrete surfaces, equipment replacement, and electrical improvements associated with the Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

14 grit removal system. During this time, a portion of the plant flow may be directed to the Flow Equalization Basin or directly to Aeration Basin #5 at the discretion of ECRWRF operations personnel. In no case, however, shall any portion of the plant flow be directed to the Influent Bypass Structure. All plant flow shall pass through the new flow meters and influent screens. 4. Foul Air Collection System Foul air collection piping in the common screen effluent channel downstream of the new screens is being replaced and relocated, as is the foul air collection piping serving the new Screenings Building. This work must be done during Phase 2 while the Headworks Structure is being bypassed and the existing odor control system is not in operation. All of the foul air collection piping will be recoated as part of this Project. However, this work can be performed during Phase 3 when the Headworks Structure has been placed back into operation. 5. Power Supply and Electrical Distribution System Improvements There are no specific constraints on when construction of power supply and electrical distribution system improvements can occur other than the Headworks Structure must stay in full operation during Phase 1 and partial operation (one grit removal train out of service) during Phase 3 work. The Contractor shall schedule work on the electrical and instrumentation and control components of the Project with these general constraints in mind. **END OF SECTION** Sequence of Work Headworks and Grit Removal Improvements 4/18/2017

15 SECTION COORDINATION WITH OWNER S OPERATIONS PART 1--GENERAL 1.01 DESCRIPTION Regulatory discharge requirements for the plant effluent require continuous and adequate treatment and disinfection of wastewater to meet the plant s operating permit. At no time shall flow into the plant be required to be stopped to perform the Work. Contractor s means and methods shall be implemented such that the existing plant shall remain in continuous satisfactory operation during the entire construction period except as absolutely required for the Work. Work shall be so scheduled and conducted by Contractor such that it shall not reduce the quality of the plant effluent or cause odor or other nuisances. In performing the Work shown and specified, Contractor shall plan and schedule the Work to meet both the constraints outlined in this Section and all other sequencing and work requirements specified in these Contract Documents. The Contractor is specifically pointed to Section Sequence of Work. Contractor has the option of providing additional temporary facilities that can eliminate a constraint provided it is done without additional cost to the Owner, presents no safety hazards, and provided that all requirements of these Specifications are fulfilled. Contractor shall be responsible for coordinating all shutdowns with the Owner and Engineer. Contractor shall, whenever possible, combine discrete shutdown procedures into a single shutdown when the duration of the shutdowns or the Work requirements allow such combining to occur on a unit process or work area. The intent of combining procedures is to minimize the impacts upon plant operations and processes by limiting the number of shutdowns required. Contractor shall not shut-off or disconnect any operating system of the plant, unless approved by the Owner and Engineer, in writing. All plant equipment operations and shutdowns shall be executed by the Owner, unless otherwise noted. Contractor shall seal Owner operated gates and valves to prevent unnecessary leakage. After Contractor s Work has been completed, Contractor shall remove the seal to the satisfaction of the Engineer. Contractor shall refer to the Drawings and other Sections for definition of the equipment, piping, material and appurtenances to be removed, turned over to the Owner and stored on site, or to become the property of Contractor and removed from the site. Contractor shall be responsible for design and supply of all temporary pipelines, valves, pumps, meters, equipment, spare parts, electrical, controls, and any other appurtenances required for the installation and operation of temporary bypass lines, pumping systems, or conveyance systems required to maintain operations of the plant during construction activities. All pumps shall be Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

16 provided with magnetic flow meters capable of providing a 4-20 madc output signal. Contractor shall submit to the Engineer, for review and approval, the design for all temporary processes, pumping, or conveyance systems at least thirty (30) days prior to the commencement of the construction of the Work associated with the temporary facilities. Contractor shall stage the work to maintain unobstructed access for emergency vehicles to all buildings, building Siamese connections, and fire hydrants GENERAL CONSTRAINTS New units may only be used after the specified testing is completed and the units are accepted for use by the Engineer, in writing. The following constraints shall be applied to all equipment appurtenant utility systems on the plant site. 1. Load limits on Access Roads: Existing and new underground facilities, such as electrical duct banks, pipelines, etc., in, under and crossing plant roads, have been designed for a maximum wheel load of AASHTO H-20. Contractor shall not exceed this weight limit and shall provide means of protecting the underground facilities. 2. Access to Plant Site: An unobstructed traffic route through all plant gates shall be maintained at all times. 3. Safety Barriers: Contractors shall place safety barriers around active construction located in operational areas accessible to plant personnel. 4. Personnel Access: Treatment plant personnel shall have access to all areas which remain in operation throughout the construction period. 5. Potable Water System: The existing potable water system shall be kept in operation at all times. 6. Plumbing Facilities: Sanitary facilities in the existing structures shall be operational at all times for plant operating personnel, unless otherwise specified. All other building plumbing systems, such as roof and floor drains, pumping, etc., shall be maintained for all structures. 7. Storm drainage: Storm drainage on the site shall be operational at all times, unless otherwise specified. 8. Building Heating and Ventilating: In Contractor s work areas and areas affected by Contractor s operations, building heating and ventilating shall be both provided and maintained in structures, including pipe galleries. The temperatures to be maintained in any area occupied by plant personnel, such as offices, lunchrooms, locker rooms, toilet rooms, facilities containing computer control equipment, etc., shall be at least 65 F and not greater than 80 F. The Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

17 temperatures to be maintained in all other interior plant areas, whether new, exiting or temporary, shall be maintained at a minimum of 55 F and not greater than 90 F. 9. Power, Light and Communication Systems: Electric power, lighting service and communication systems shall be maintained in uninterrupted operation to the various process areas of the Headworks Structure whenever those process areas are in full or partial operation. 10. Sump Pumps and Sumps: All existing sumps shall be maintained in an operable condition with either existing pumps or temporary pumps provided by Contractor. Interim piping, power and controls shall be provided by Contractor, as required by the construction sequence and as directed by the Engineer. 11. Seal and Service Water Piping: A supply of service and seal water and the necessary connections to existing equipment shall be maintained during construction, unless otherwise specified. Interim piping shall be provided by Contractor, as required. 12. The Owner will be responsible for draining liquids from process tanks, basins, channels and other structures. It is Contractor s responsibility to clean the tanks, basins, channels and other work areas, and dispose of any accumulated residuals at an off-site disposal facility permitted to accept the materials. The Contractor shall maintain a clean and dry work area by pumping and disposing of all washdown and cleaning water, stormwater, and other liquids that accumulate in the work areas. 13. All shutdowns of existing systems or piping shall be performed by plant operations personnel. All existing valves and gates shall be operated by plant operations personnel unless the Contractor has been provided written authorization by the Owner or Engineer to perform such activities. 14. Draining Process Pipes and Conduits: a) Unless otherwise specified, the contents of pipes and conduits undergoing modifications shall be transferred to the plant drain system using hoses, piping, or pumps. b) If a drain is not available on the pipe to be drained, then a wet tap shall be made by Contractor using a tapping saddle and valve approved by the Engineer. No uncontrolled spillage of a pipe s contents shall be allowed. c) Any spillage shall be brought to the Engineer s attention immediately. Contractor shall wash down any spillage to floor drains, sumps and sump pump discharge piping and then flush out the system to prevent clogging and septic odors. If spillage is not suitable for drainage system, Contractor shall remove spillage by other method such as Vactor truck, as approved by the Engineer Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

18 15. Temporary Partitions and Enclosures: Contractor shall provide temporary partitions and enclosures as necessary to maintain dust-free, heated and ventilated spaces in all areas which are adjacent to the Work and which must be kept operational by the plant. 16. Dead End Valves of Pipe: Contractor shall provide blind flanges on all valves or pipes which dead-end a line on a temporary or permanent basis. Blind flanges shall be braced and blocked, as required or as directed by the Engineer in the field SHUTDOWNS A. GENERAL: A shutdown shall be defined as a portion of the normal operation of a plant unit that has to be suspended or taken out of service to perform the specified Work. Note that shutdown does not mean a shutdown of flow into the plant and at no time shall the plant not be allowed to receive flow from the wastewater collection system. For each shutdown, Contractor shall conduct a hazard safety assessment, compile an inventory of labor, tools, safety equipment and materials required to perform the tasks, develop an estimate of the time required to complete each task, and prepare a written description of steps required to complete all tasks of the shutdown. In addition, the MOPO Form provided in Section shall be completed for each shutdown. Contractor shall also request in writing from the Engineer, approval for each shutdown a minimum of 21 calendar days prior to the proposed shutdown date. No shutdown shall be initiated until the inventory of materials and labor is verified by the Engineer on site at least one week prior to the proposed start date. All shutdowns of existing systems or piping shall be performed by plant operations personnel and all existing valves and gates shall be operated by plant operations personnel unless the Contractor has been specifically authorized in writing by the Engineer to perform such activities. Contractor shall arrange for a minimum of three meetings with the Owner and the Engineer for each shutdown. The first shall be a general planning strategy meeting for the shutdown. The second meeting shall review the roles of the Contractor, Engineer and Owner in the shutdown and shall, in detail, review all aspects of the shutdown. The shutdown plan and MOPO shall be presented and finalized for this meeting. The first meeting shall be, at a minimum, 14 days before the desired shutdown and the second meeting shall be no more than 3 days before the shutdown. A final pre-shutdown meeting with the Owner and Engineer shall also be held immediately before the shutdown for final coordination purposes. The Work required herein and any other Work required by the Engineer which may interrupt the normal plant operations shall be accomplished at such times that will be convenient to the Owner. Contractor shall also have on hand and located in close proximity to the work area, all tools, equipment, spare parts and materials, both temporary and permanent, necessary to complete each work category without interruption. Adequate numbers of personnel shall be scheduled for each shutdown, so that the work shall be accomplished within the specified time Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

19 frame. Prefabrication of all piping and other assemblies shall be completed, to the greatest degree possible, prior to any shutdowns. The Engineer shall inspect the work area, tools, equipment, spare parts and materials prior to the shutdown and shall be satisfied that Contractor has complied with these requirements, to the fullest extent possible, before shutdowns will be authorized. This review however, does not relieve the Contractor from having full responsibility of the shutdown activity for having the appropriate tools, equipment, spare parts and materials, both temporary and permanent, necessary to complete each work category without interruption. If Contractor s procedures cause an unscheduled shutdown of the facilities, Contractor shall perform work as necessary to immediately re-establish satisfactory operation. Contractor shall notify the Engineer, in writing, immediately of any unscheduled shutdown. Contractor shall permit Owner s personnel to work with Contractor s personnel, as required, to maintain the plant in continuous satisfactory operation. Unscheduled shutdown and/or interruptions of continued safe and satisfactory operation of the facilities that result in any fines levied, shall be the responsibility of Contractor if it is demonstrated that Contractor was negligent in his work or did not exercise proper precautions in the conduct of his work. All work requiring equipment to be out-of-service shall be performed during the scheduled shutdowns shown. It should be noted that plant staff will continue to perform administrative, operation and maintenance functions during shutdowns. B. SHUTDOWNS OF ELECTRICAL SYSTEMS: Contractor, in conjunction with Owner and appropriate plant operations personnel, shall lock out and tag circuit breakers and switches operated by the Owner and shall check cables and wires to be sure that they are de-energized to ground potential before work begins. Upon completion of the work, Contractor shall remove the locks and tags and notify the Engineer that the facilities are available for use OVERTIME All overtime work by Contractor necessary to conform to the requirements of this Section and related Sections shall be performed by Contractor, at no cost to the Owner and shall be performed in accordance with the General Conditions. Contractor shall make no claims for extra compensation as a result thereof MAINTENANCE OF PLANT OPERATIONS SCHEDULE AND NARRATIVE DESCRIPTIONS In order to maintain continuous plant operation during construction, a blank and a completed sample of Maintenance of Plant Operations (MOPO) Schedules are included in Section Within each MOPO item s procedural steps, time and scheduling constraints and milestone dates shall be outlined. Contractor shall develop a detailed narrative description, in addition to that provided in the MOPO, for all shutdowns. These narrative descriptions shall be catalogued and submitted to the Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

20 Engineer for review and approval within ninety (90) days following the Notice to Proceed. Contractor shall maintain these narratives in a binder which shall be reviewable at any time by the Engineer. These narratives shall be clearly identifiable on and be able to be cross-referenced with the project schedule maintained by the Contractor. As adjustments are made, as necessary by the progression of the Work, the Contractor shall modify and resubmit these narrative descriptions. PART 2--PRODUCTS (NOT USED) PART 3--EXECUTION (NOT USED) **END OF SECTION** Coordination with Owner s Operations Headworks and Grit Removal Improvements 4/18/2017

21 SECTION FLAT ALUMINUM COVERS PART 1 GENERAL 1.01 DESCRIPTION A. SCOPE: This section specifies the design, fabrication and erection of the flat aluminum covers as shown on the Contract Drawings (all inclusive) for the purposes of containing odors and foul air and allowing air exhaust to the odor control scrubber systems. Flat covers will rest on the newly constructed concrete, aluminum support members and existing concrete top slab as shown on the Contract Drawings. Provide integral access hatches within the cover system where indicated on the Contract Drawings. Cover design shall provide for expansion and contraction due to climatic change without damage to the covers. Interlocking panels shall be substantially watertight and air-tight. A neoprene gasket (or similar) shall be incorporated at the cover/concrete interface. See leakage testing requirement in Part 3. Flat covers shall accommodate existing features of the structure(s) such as pipes, gates, electrical conduits, electrical pull boxes, light poles, and flow measuring devices without leaving more than 1/2-inch clearance around the accommodated feature. To the extent required to maintain system pressure, cover penetrations and the leakage created, shall be sealed with neoprene, santoprene or hypalon and aluminum/rubber boot flashing. Cover manufacturer is to field verify all dimensions and potential interferences prior to proceeding with fabrication and erection of covers. The Cover Manufacturer / Contractor is to avoid or otherwise accommodate these existing features in the design, unless the Contract Drawings specify modifications to existing features. Contract Drawings also illustrate the locations of required hatches and panel openings. Cover manufacturer shall field verify all penetration locations, support locations and cover dimensions prior to fabrication of the aluminum covers. B. TYPE: The covers shall consist of extruded flat panels with a striated surface. The cover shall be designed in such a way that it does not interfere with the operation of process equipment below the cover. The aluminum panels shall be sealed continuously along their edges to the structural members and adjacent panel sections forming a system of interlocking joints with a continuous substantially air-tight surface over the entire cover. At the concrete surfaces, extrusions or flashing shall be utilized to create this seal and neoprene/santoprene gaskets shall separate the aluminum from the concrete throughout Flat Aluminum Covers Headworks and Grit Removal Improvements 8/4/2017