1. SOW_Grit Rehab Repair_Amendment 1-rmk.docx

SBIWTP

Emergency Repair to Grit Facility San Diego County, California

Statement of Work

Repair to Grit Facility

South Bay Intl. Wastewater Treatment Plant (SBIWTP) San Diego County, California

Amendment #1 August 28, 2024

International Boundary and Water Commission (IBWC) United States and Mexico United States Section Headquarters, El Paso, Texas

SECTION I. BACKGROUND

The South Bay International Wastewater Treatment Plant (SBIWTP) is a plant located in San Diego County, CA. The plant treats sewage originating in Tijuana, Mexico and discharges it to the Pacific Ocean. Located at the San Diego Field Office, SBIWTP is part of the U.S. International Boundary and Water Commission (IBWC), a federal agency headquartered in El Paso, TX. SBIWTP has an immediate need to repair many components to their grit facilities. Existing aeration blowers and compressors have failed due to excessive wear and tear caused by sediment. Immediate repair & rehab within the grit facilities is needed to repair components past their life in order to maintain safe and reliable operations.

SECTION II. SCOPE OF WORK

The required work shall be performed in accordance with this Statement of Work, IBWC Form 245 (attached), and all applicable Federal, State and Local laws & regulations. The Contractor shall provide all labor, materials, management, supervision, services, and coordination required to fulfill the scope of work. The scope of work describes the need to replace (3) three grit classifiers, replace (6) six grit gallery pumps, installation of new (6) six grit pump Variable Frequency Drives (VFD), replace (2) two primary channel air blowers, and (2) two grit air blowers. Additionally, the scope of work includes a requirement to conduct a short-circuit Arc Flash Study throughout the entire water treatment plant.

It is the responsibility of the contractor to validate actual site conditions. Before installation begins, the Contractor may perform a physical survey of the actual site to verify, inspect, and obtain all information needed for the performance of work. The Contractor shall notify the Contracting Officer (CO) of any conditions that prevent the suitable completion of these services (if any). If the Contractor discovers such problems associated with the work after starting, he or she shall immediately notify the Contracting Officer Representative (COR), and obtain approval if work is to continue. It is the responsibility of the contractor to coordinate with SBIWTP personnel to ensure all local & state requirements are completed before completion of installation. This includes permits and approvals to ensure a turnkey installation.

SECTION III. LOCATION

South Bay International Wastewater Treatment Plant (SBIWTP) 2995 Clearwater Way San Diego, CA 92154

SECTION IV. PERIOD OF PERFORMANCE

The period of performance shall not exceed 240 days from the date of Notice to Proceed (NTP).

SECTION V. HOURS OF OPERATION

Contractor personnel shall perform the work during normal business hours, M-F 0800-1700 hrs, until completion. Exceptions to those hours will be weekends, holidays, and any other IBWC indicated down days. Schedule coordination will be conducted at contract award.

SECTION VI. SPECIFIC REQUIREMENTS

· Grit Classifiers Area:

Grit classifiers shall be provided with Type 316 Stainless Steel (SS) hardware. Ladders to access classifiers shall be provided. Existing electrical wiring may be re-used,. Provide and install OCAL fittings and NEMA 4X boxes as needed. Match existing NFPA electrical classification for explosive atmospheres.

a. Demolish and remove 3 classifiers, motors, flow meters, piping, valves, appurtenances, and select concrete (as needed) in classifier area.

b. Provide and install new (3x) classifiers (also known as separators) and instrumentation (in-kind) as recommended by manufacturer. Provide submittals for approval prior to ordering.

c. Provide and install new (3x) motors, including wiring whips, HOA switches, and instrumentation (in-kind) as recommended by manufacturer. Provide submittals for approval prior to ordering.

d. Provide and install new (2x) flow meters (in -kind) compatible with proposed grit equipment and existing SCADA system. Provide submittals for approval prior to ordering.

e. Provide and install new grit piping (Ductile Iron Glass lined) from 8”x6” 90-degree bend from ground elevation outside headworks to classifier area on upper floor of headworks building, and all piping

1. Plug Valves with handwheel, check valves.

2. Fittings (Elbow, Cross, Tee, Reducer, Wye, Cap, Etc.)

3. Victaulic Couplings

4. Support Brackets, Clevis Hangers, restrained joints as required.

5. Type 316 SS hardware for all piping, valves, fittings, etc.

6. Provide submittals for approval prior to ordering.

2. Grit Pump Gallery:

Grit pumps and associated piping, valves, appurtenances shall be installed with Type 316 SS hardware. Provide and install OCAL fittings and NEMA 4X boxes as needed, and provide an install new wiring and conduit to proposed grit pumps with proposed VFDs if VFDs ordered. Match proposed equipment to existing NFPA electrical classifications for explosive atmospheres. Use owner-provided gates and install gates to bypass the existing grit system as needed with maximum 1-day shutdown. Drain, dewater, and remove grit and sediment as needed from existing grit system to complete the work.

a. Demolish and remove 6 grit pumps, motors, wiring to grit pump (if new VFDs provided), flow meters, grit piping, seal water piping, non-potable water piping, and all valves, appurtenances, and select concrete (as needed) in gallery area. Provide submittals for approval prior to ordering.

b. Provide and install (6x) grit pumps to be upgraded from Discflo Pump (Model 604-17) grit pumps to pumps that will increase processing flow capabilities by 10%. Due to current operations, only Discflo or Wemco Hydrostall pumps will be acceptable. Proposed pumps shall be waterless grit pumps with no seal water. Provide and install seismic concrete pump pads for each pump accordingly. Provide and install new instrumentation (in-kind), wiring whips and HOA switches for each pump. Provide and install new conduit and wiring from MCC to VFDs and grit pumps if VFDs ordered. Contractor is to submit material & equipment product information for review and approval of COR before purchasing. Provide submittals for approval prior to ordering.

c. Provide spare PLC equipment as recommended by pump manufacturer and compatible with existing SCADA system to include (2x) 1756 – L83 - PLCs, (2x) 1756 – EN2TR – Ethernet Communication Modules, (2x) 1756 – RM2 – Redundancy Modules. Provide submittals for approval prior to ordering.

d. Provide and install grit piping (Ductile Iron Glass lined) to replace all suction & discharge piping from grit chamber concrete to 8”x6” 90-degree reducer elbow where discharge piping leaves grit gallery at ground elevation. The grit inlet piping, valves (plug and check), fittings, and appurtenances shall be upsized from current 4” to 6” and discharge piping shall remain 6”.

1. Plug Valves w/handwheel & chainwheel operators, check valves.

2. Fittings (Elbow, Cross, Tee, Reducer, Wye, Cap, Etc.)

3. Vitaulic Couplings

4. Support Brackets, Clevis Hangers, restrained joints as required.

5. 6” Flow Meter Flange

6. Type 316 SS hardware for all piping, valves, fittings, etc.

7. Provide submittals of all items for approval prior to ordering.

e. Provide and install (2x) flow meters (in-kind) on each discharge line to be compatible with proposed grit equipment and existing SCADA system. Provide submittals for approval prior to ordering.

f. Provide an install (2x) grit blowers (in-kind). Provide and install new instrumentation (in-kind), wiring whips, HOA switches, OCAL electrical fittings, NEMA 4X boxes as needed for each blower. Match existing NFPA electrical classification for explosive atmospheres. Provide and install structural shade to protect new grit blowers that can be easily removed for maintenance. Provide submittals for approval prior to ordering.

g. Provide and install new 4” non-potable water pipe line, including valves, fittings, and appurtenances with Sch 80 PVC. Provide submittals for approval prior to ordering.

3. Primary Channel Air Blowers

a. Demolish and remove 2 primary channel air blowers, motors, wiring to blowers, piping to expansion joint, valves, appurtenances, and select concrete (as needed).

b. Provide and install (2x) blowers and instrumentation (in-kind) as recommended by manufacturer, piping, fittings, appurtenances.

c. Provide and install (2x) blower motors (in-kind), including wiring whips, HOA switches, OCAL electrical fittings, NEMA 4X boxes as needed. Match existing NFPA electrical classification for explosive atmospheres.

d. Provide submittals for approval prior to ordering.

4. Arc Flash Study

a. Arc flash study of wastewater treatment plant site to be broken down by plant areas (Main Switchgear Maintenance Building, General and Site, Headworks, Primary Sedimentation Area, Secondary Sedimentation Area, Activated Sludge Area, Advanced Primary Chlorination Facilities, Waste Activated Sludge Thickening Area, Solids Processing Area, Standby Power Generation Facilities Area, Secondary Treatment Blower Building Area).

b. Provide submittals for proposed study for approval prior to ordering.

5. The Contractor shall provide all manufacturer-recommended spare parts of proposed equipment and any incidentals such as pulley (sheaves), belts, etc. needed to complete the work.

6. All materials or equipment removed from the work site and not scheduled for reinstallation or turnover to the Government under terms of the contract shall be removed from the site for disposal by the Contractor at the earliest possible time after removal/demo. The Government reserves the right of first refusal on removed materials such as spare parts, pumps, etc.

7. The Contractor shall start up and test the new classifiers, grit pumps, blowers, VFDs, surge tanks in accordance with manufacturer recommendations and provide submittals of manufacturer’s startup and testing reports.

8. The Contractor shall ensure proper function and operation of the new classifiers, grit pumps, and blowers, surge tanks, VFDs.

9. The Contractor shall provide manufacturer’s warranties, provide O&M manuals, and include shop drawings.

ADDITIONAL BID OPTION ITEMS:

At the time of contract award, the Government may elect to purchase (but not guaranteed) additional services for items described below:

Bid Option Item A: Surge Control System repair at the Goat Canyon Pump Station by providing and installing (2) two surge arrestors tanks (in-kind), electrical and control wiring, conduits, concrete modifications as needed, and additional accessories needed to accomplish the task. Demolish and remove existing equipment as needed for new installation from site. Existing surge arrestor tanks are horizontal, hydropneumatics pressure vessels, manufactured by Young Engineering and Manufacturing, Inc. SA-1 has a diameter of 6 ft-0 inches, a shell length of 8 ft-3 inches, an overall length of 11 ft-3 inches, a usable capacity of 280 cubic feet, a design flowrate of 2,435 gpm, a maximum design pressure of 100 psi, and a maximum working pressure of 40 psi. SA-2 has a diameter of 7 ft-0 inches, a shell length of 12 ft-4 inches, an overall length of 15 ft-11 inches, a capacity of 550 cubic feet, a design flowrate of 4,000 gpm, a maximum design pressure of 100 psi, and a maximum working pressure of 24 psi. Alternative surge arrestor systems may be considered for review when submitted with product and surge system information that is supported with CA sealed professional engineering design and construction documents. Provide submittals for approval prior to ordering.

Bid Option Item B: Surge Control System repair at the Hollister Pump Station by providing and installing (2) two surge arrestors tanks, (1) one air compressor, stainless steel air lines, electrical and control wiring, conduits, concrete modifications as needed, and additional accessories needed to accomplish the task. Existing vacuum valve can be reused. Demolish and remove existing equipment as needed for new installation from site. The surge arrestor tanks are horizontal, steel, hydropneumatic pressure vessels, manufactured by Young Engineering and Manufacturing, Inc. SA-1 has a diameter of 6 ft-0 inches, a shell length of 8 ft-3 inches, an overall length of 11 ft-3 inches, a usable capacity of 280 cubic feet, a design flowrate of 3,680 gpm, a maximum design pressure of 125 psi, and a maximum working pressure of 33 psi. SA-2 has a diameter of 8 ft-6 inches, a shell length of 24 ft-4 inches, an overall length of 28 ft-8 inches, a capacity of 1500 cubic feet, a design flowrate of 16,950 gpm, a maximum design pressure of 125 psi, and a maximum working pressure of 30 psi. The compressor, which is manufactured by Ingersoll-Rand, Model 2475, is a two cylinder, splash lubricated air compressor driven by a 5 hp, 1760 rpm, 3 phase, 60 Hz,230/460 volt motor, manufactured by Baldor Electric Company. Additionally, replace the existing airline from PVC to stainless steel, including surface restoration for trenching. Alternative surge arrestor systems may be considered for review when submitted with product and surge system information that is supported with CA sealed professional engineering design and construction documents. Provide submittals for approval prior to ordering.

Bid Option Item C: IBWC is seeking a brand-new requirement, and addition of VFDs to the Grit gallery. Contractor is to procure (6) new VFDs, where the COR may designate a preferable location to install. Contractor shall procure VFDs that are supported with CA sealed professional engineering design and construction documents and installed according to manufacturer’s recommendations. VFDs must be compatible to existing SCADA system and mounted on seismic pads with shade structure.

a. VFD's shall be Rockwell VFD's to be consistent with existing site equipment/components.

b. The PLC Code must be modified to properly control the VFD's.

c. The VFD's should have the capability to be controlled through TCP/IP communications and hard wired controls (DI/DO, AI/AO), alarms

d. The PLC code for the VFD's shall have different operation modes, Auto/Manual, etc., Site Operations staff should be consulted to ensure optimal operating modes are provided/available.

e. PLC programming developed shall be provided to IBWC for review and approval.

f. Additional PLC programming as needed/determined.

g. The VFD's should be add into the PLC code IO tree.

h. The HMI must be updated by creating tags, screens, buttons, etc. to provide control, monitoring, and diagnostic information for the VFD's.

i. Proposed HMI changes/modifications to be provided to IBWC for review/approval prior to implementing on the system.

j. A new network switch, shall be provided for the VFD's.

k. The network switch needs to be a managed Layer 2/3 switch.

l. The switch should be minimum 1GBps switch with Fiber SFP and RJ45 ethernet ports.

m. Compliant with IBWC security requirements.

n. Field Acceptance testing to be completed with Veolia SCADA System Administrator for verification of PLC code/operation and HMI monitoring/value readings/ and control capabilities for the VFD's.

o. Testing, verifications and acceptance to be documented, dated, and provided/reported within 15 days after being conducted/completed.

p. Standard of Procedures (SOPs) should be provided to site staff to ensure documentation exists to reference on how to operate the equipment.

q. SOP's should be for operating the equipment locally or remotely, using the HMI, etc.,

r. SOP's should include image/photos, and step by step procedures,

s. Training on how to operate the equipment locally, remotely, using the HMI should be provided to all site staff to ensure proper operation of the equipment.

t. Sequence of Operations (SOO) (Controls/PLC focused not an O&M manual) for the grit pumps/VFDs should be written and provided for review and acceptance by IBWC.

u. Provide submittals for approval prior to ordering.

SECTION VII. EXISTING CONDITIONS

The contractor shall field verify all existing information. Some, but not all, existing conditions & specifications are provided below:

1. Grit Classifiers/Separators specifications:

· Manufacturer: Wemco Pump

· Type: 18in-FF Hydrogritter

· Classifier: 18-inch diameter screw type, fullflared tank

· Separator: Cyclone type, WEMCLONE-1500C

· Capacity: 500 GPM @ 8 PSIG

· Feed Chamber Size: 15 in.

· Reducer Type: Orbital

2. Grit Pumps specifications:

· Manufacturer: Discflo Pump

· Model No: 604-17

3. Please be noted, there are no redundancies at any of the previously mentioned grit operations.

SECTION VIII. WARRANTIES

1. Warranty of Labor. The Contractor shall provide standard warranty for labor or extended labor warranties offered to the general public in customary commercial practice. The minimum warranty should be one (1) year after project completion date. The Contractor shall respond to the CO or POC within twenty-four (24) hours for the repair of all warranty items.

2. Warranty of Materials. The Contractor shall provide manufacturer's standard performance guarantees or extended warranties offered to the general public in customary commercial practice such as warranties including minimum five (5) years wear warranty, two (2) years material and workmanship.

SECTION IX. DAMAGES/SAFETY

The Contractor shall conform to the safety requirements contained in the contract for all activities related to the accomplishment of the work as required by OSHA. The Contractor shall provide protection to Government property to prevent damage during the period of time the property is under the control or in possession of the Contractor. Any damage caused by the Contractor during installation is the responsibility of the Contractor and must be reported to the Contracting Officer (within two (2) hours) along with all available facts relating to each instance of damage to Government property or injury to either Contractor or Government personnel.

SECTION X. SCHEDULING OF WORK

This contract may include work in multiple use type facilities. The facilities may or may not be occupied when work is in progress; however, all work must be coordinated through the CO to minimize interruption of service. It shall be the Contractor’s responsibility to take whatever measures are necessary to assure the protection of assets, furnishings, equipment, etc., and to perform the work to cause minimal disruption of ongoing activities in occupied areas. The Government will advise of any known phasing or work hour situations for each project. The Contractor may propose phasing plans as part of his or her proposal package as suited for the project.

1. When specifically requested by the Government, the work shall, so far as practicable, be phased in definite sections or areas and confined to limited areas that shall be completed before work in other areas is begun.

2. The Contractor shall schedule work concurrently on all active projects without extending performance periods due to insufficient resources.

SECTION XI. SUBMITTALS

Deliver all submittals (hard copy or electronic) for review to the CO within 14 calendar days after the Notice to Proceed (NTP), unless otherwise specified. Approval by the Government shall not absolve the Contractor from his/her responsibilities for specific performance of the item or items submitted. Schedule and provide submittals requiring Government approval before acquiring the material or equipment covered thereby. The Government will have 5 business days for return of the submittals to the Contractor. Contractor shall submit ‘Submittals’ which are required for this project, which include:

· List of proposed key personnel

· Phasing/Work Plan

· Construction Progress Schedule (Gantt Chart), to include material lead times, and critical path

· Quality Control Plan

· Environmental protection plan

· Submittals to include product data for all proposed equipment prior to ordering

· Manufacturer recommended testing and start-up reports for all proposed equipment

· Manufacturer certification that final work has been installed in accordance with manufacturer requirements

· Warranties

· O&M manuals to include standard operating procedures

· As-Builts updated with new facilities installed

SECTION XII. COMPLETION INSPECTION

1. Pre-final inspection: The Government will perform the pre-final inspection to verify that the work is complete and ready to be occupied. A Government Pre-Final Punch List may be developed as a result of this inspection. Ensure that all items on this list have been corrected before notifying the Government, so that a Final inspection can be scheduled. Correct any items noted on the Pre-Final inspection in a timely manner. These inspections and any deficiency corrections required by this paragraph need to be accomplished within the time slated for completion of the entire work or any particular increment of the work if the project is divided into increments by separate completion dates.

2. Final Inspection: The Contractor's personnel, plus the superintendent or other primary management person, and the Contracting Officer's Representative is required to be in attendance at the final acceptance inspection. Additional Government personnel including, but not limited to, those from IBWC user groups, can also be in attendance. The final acceptance inspection will be formally scheduled by the Contracting Officer based upon results of the Pre-Final inspection. Notify the Contracting Officer at least 14 days prior to the final acceptance inspection and include the Contractor’s assurance that all specific items previously identified to the Contractor as being unacceptable, along with all remaining work performed under the Contract, will be complete and acceptable by the date scheduled for the final acceptance inspection. Failure of the Contractor to have all contract work acceptably complete for this inspection will be cause for the Contracting Officer to bill the Contractor for the Government's additional inspection cost in accordance FAR 52.246-12 Inspection of Construction.

END OF STATEMENT OF WORK

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