6 - SOW BGNDRF Storage Tanks Maintenance and Repairs 11-20-2020_1.docx

STATEMENT OF WORK (SOW)

BGNDRF Storage Tanks Maintenance and Repairs

12/21/2020

1.0 INTRODUCTION

1.1 The Bureau of Reclamation, Upper Colorado Region, Brackish Groundwater National Desalination Research Facility (BGNDRF) has a requirement for performing maintenance and repair on three large, glass-fused to steel, water storage tanks. All tanks were built in 2004 and put in service shortly afterwards. The storage tanks are numbered 1 through 3 with storage tank 1 being the westernmost tank (50,000 gallons), storage tank 2 being the middle tank (100,000 gallons) and storage tank 3 being the easternmost tank (50,000 gallons).

1.2 BGNDRF is a 43-acre complex in which groundwater from four wells can be delivered to indoor and outdoor test sites. Water discharged from the wells is routed to the various test sites through the three storage tanks. Generally, a unique well water is placed in each storage tank and deliveries to various clients can be made based on their request for a specific well water.

1.3 The conductivity of water stored in each storage tank can be as high as 6,600 µS/cm.

1.4 The three storage tanks underwent very little maintenance since they were put into service. Inspections of the storage tanks were performed in 2016 and 2018 by a contractor specializing in these types of tanks. See Exhibits A and B. This SOW is written based on most of the recommendations in the inspection reports.

1.5 A contaminant, per- and polyfluoroalkyl substances (PFAS), has been detected in 2 of 4 BGNDRF well waters. The City will not allow water with any detectable level of PFAS to be discharged to its wastewater treatment plant. As a result, the dead space in the bottom of the storage tanks will occasionally need to be transferred to the BGNDRF evaporation ponds. A new drain port is in each tank needs to be added for ease of this operation.

1.6 Storage Tank information is presented in the table below:

2.0 SCOPE OF WORK

This Statement of Work covers the maintenance and repairs of all three storage tanks at BGNDRF. A drain through the tank wall near the floor with a valve and plumbing will be added to each tank. The Contractor must provide all materials, supplies, tools, sealers, coatings, mastics, personal protective equipment, scaffolding, ladders, surface preparations and anything else necessary to perform all maintenance and repairs. The Contractor will be required to schedule a month in advance when the work will begin. The worksite at all 3 storage tanks must be completely clean upon completion of work. Mobilization and demobilization costs will be paid by the Contractor.

3.0 DESCRIPTION OF WORK

3.1 Location. The work is located at BGNDRF, 500 LaVelle Road, Alamogordo, New Mexico 88310. BGNDRF is a 43-acre complex comprised of a central research building, various test areas, and water and wastewater delivery systems. The storage tanks are in the south-central area of the property. See Exhibit C for an aerial view of BGNDRF and for the location of the storage tanks.

3.2 Mobilization. The BGNDRF client load and project activity can vary significantly throughout the year. Generally, the number of clients and project activity can taper off from November through February each year. Due to the need to minimize impacts to BGNDRF clients and projects, it is unclear if the Contractor will need to mobilize one time to accomplish the work in this Statement of Work or if the Contractor will need to mobilize multiple times. Specifically, the Contractor may mobilize a minimum of 1 time or a maximum of 3 times. BGNDRF will make every effort to work with its clients to minimize the number of mobilizations.

3.3 Replace Liquid Level Decals. Remove old liquid level decals at each of the 3 storage tanks and prepare each surface for the new decals. Adhere new decals to the metal substrate, ensuring that they are positioned properly for indicating depth of water in each storage tank. The decals shall be positioned with clean vertical lines with no loose edges or bubbles under the decal. All work including surface preparation and application of the decals must be performed according to manufacturer’s recommendations.

3.4 Repair Damaged Knuckle Roofs and Other Exterior Tank Panel Damage. The 2018 Inspection Report (See Exhibit B) has photos of damages to the knuckle roof on each of the 3 storage tanks. Each of these areas and all other damages on the knuckle roof panels and side exterior panels must be repaired. Damaged surfaces will be prepared for application of Manus Sealer No. 98 or equivalent. Factory recommendations for the preparation of surfaces and application of the sealer must be followed.

3.5 Cleaning of the Interior of Each Storage Tank. The Government will drain each of 3 storage tanks prior to the Contractor commencing work on the interior. The Government will remove and dispose all sediment from each storage tank. The Contractor will pressure wash the biofilm from the interior walls of each storage tank.

3.6 Total Reseal of Interior Sidewall Tank Seams. A total reseal will be required for all 3 storage tank’s interior, sidewall seams after the tank interiors have been power washed by the Contractor.

3.6.1 Remove bottom ring panel to facilitate scaffolding access for tank interior work.

3.6.2 Scrape and power wire brush all interior, sidewall panel edges to clean metal.

3.6.3 Reseal all interior, sidewall panel edges with CIM 1061 two-component urethane using manufacturer’s standard application practice.

3.6.4 Stripe along all interior bolt heads with CIM 1061 two-component urethane approximately 4”-6” wide to coat over bolt heads and overlapping single component urethane sealer.

3.6.5 Stripe along top panel edge with CIM 1061 two-component urethane approximately 4”-6” wide to coat top edge and top horizontal bolt seam.

3.6.6 At tank shell floor line, coat with CIM 1061 two-component urethane approximately 8” out onto properly cleaned concrete floor and 12” up onto tank shell.

3.6.7 Coat bottom full panel edges with CIM 1061 two-component urethane coating.

3.6.8 Perform touch-up with single component urethane sealer per tank manufacturer’s standard maintenance practice of glass coated interior panel surfaces that exhibit coating voids or show evidence of rust corrosion.

3.6.9 Reinstall bottom ring panel (removed for scaffolding access) using new fasteners and exterior bolt caps. Reseal interior seams of the bottom ring panel with CIM 1061 two-component urethane to re-establish panel edge protection.

3.7 Maintenance/Repair of Corrosion Protection System.

3.7.1 Replace the zinc anode in each storage tank with new zinc anodes that are sized based on storage of brackish groundwater with a conductivity of 6,600 µS/cm.

3.7.2 The 2018 inspection of Storage Tank 2 indicated a possible problem with the corrosion protection system being tied into the lightning protection system. This system will be re-inspected by the Contractor and re-wired by the Contractor according to standard industry corrosion protection practices as required.

3.8 Repaint Exterior Pipe. The 2016 inspection of the storage tanks noted the fill pipes attached to the exterior of Storage Tanks 1 and 2 needed to be repainted because some of the existing painting had come off the pipes.

3.8.1 Repaint the fill pipes on Storage Tanks 1 and 2 and touch-up paint appurtenances attached to each of the 3 storage tanks where the existing paint has come off. Use the matching color and type of coating previously applied. Prepare surfaces prior to painting according to industry practices. The dried paint should have a uniform, consistent appearance with the rest of the existing painted surfaces without splotches.

3.9 Addition of a 2-Inch Drain to Each Tank

3.9.1 Using industry accepted methods for glassed fused to steel tanks, add a 2-inch penetration through the wall of each tank as close to the floor of the tank as possible. See Exhibit D.

3.9.2 Install a valve and plumbing in each 2-inch penetration as depicted in Exhibit D.

3.10 Returning the Storage Tank to Service.

3.10.1 After completion of work, enough time shall be allowed prior to refilling the tank to allow for adequate cure time of sealer and CIM coating used on the tank interior. Cure time for sealer will depend on temperature and humidity, as a minimum, water should not be introduced into the tank for 7 days following completion of the work.

3.10.2 Water will be reintroduced by the Government according to the Fill Rate Chart in Exhibit E.

3.10.3 Disinfection is not required for reintroducing water in the storage tanks.

3.10.4 Upon reintroduction of water to each storage tank by the Government, each storage tank will be filled to the maximum level and monitored for 24 hours for leaks. If leaks are observed, the storage tank with the leak will be drained by the Government. It will be the Contractor’s responsibility to repair all leaks. After curing time for the sealer (See 3.9.1) the tank(s) will be refilled and monitored for 24-hours for leaks.

3.11 Cleanup of the Work Site Around the 3 Storage Tanks. The Contractor will be responsible for removing all debris from the worksite and restoring the worksite to pre-worksite level of cleanliness. Debris must be disposed by the Contractor at an appropriate off-site location.

4.0 MATERIAL SPECIFICATIONS

4.1 Bolt Fasteners

4.1.1 Bolts used in tank lap joints shall be ½" 13 UNC 2A rolled thread, and shall meet the minimum requirements of AWWA D103, Section 4.2.

4.1.2 Bolt Material

4.1.2.1 SAE J429 Grade 2 (1" bolt length)

4.1.2.1.1 Tensile Strength 74,000 psi Min.

4.1.2.1.2 Proof Load 55,000 psi Min.

4.1.2.1.3 Allowable shear stress with threads excluded from the shear plane 18,163 psi Min.

4.1.2.2 SAE J429 Grade 5 (1 1/4" bolt length)

4.1.2.2.1 Tensile Strength 120,000 psi Min.

4.1.2.2.2 Proof Load 85,000 psi Min.

4.1.2.2.3 Allowable shear stress with threads excluded from the shear plane – 29,454 psi Min.

4.1.2.3 SAE J429 Grade 8 (>1 1/4" bolt length)

4.1.2.3.1 Tensile Strength 150,000 psi Min.

4.1.2.3.2 Proof Load 120,000 psi Min.

4.1.2.3.3 Allowable shear stress with threads excluded from the shear plane – 36,818 psi Min.

4.1.3 Bolt Finish Zinc, mechanically deposited.

4.1.3.1 2.0 mils (0.002 inches) Min. under bolt head, on shank and threads.

4.1.4 Bolt Head Encapsulation

4.1.4.1 High impact polypropylene copolymer encapsulation of entire bolt head up to the splines on the shank.

4.1.4.2 Resin shall be stabilized with an ultraviolet light resistant material such that the color shall appear black.

4.1.4.3 The bolt head encapsulation shall be certified to meet the ANSI/NSF Standard 61 for indirect additives.

4.1.5 All bolts on the vertical tank wall shall be installed such that the head portion is located inside the tank, and the washer and nut are on the exterior.

4.1.6 All lap joint bolts shall be properly selected such that threaded portions of the bolts will not be exposed to the "shear plane" between tank sheets.

4.1.7 Bolt lengths shall be sized to achieve a neat and uniform appearance. Excessive threads extending beyond the nut after torqueing will not be permitted.

4.1.8 All lap joint bolts shall include a minimum of 4 splines on the underside of the bolt head at the shank in order to resist rotation during torqueing.

4.1.9 Polyethylene co-polymer “bolt caps” and sealant shall be used to cover the bolts, nuts, & washers exposed on the outside of the tank sidewall.

4.2 Sealants

4.2.1 The lap joint sealant shall be a one component, moisture cured, polyurethane compound. The sealant shall be suitable for contact with potable water and shall be certified to meet ANSI/NSF Additives Standard 61 for indirect additives.

4.2.2 The sealant shall be used to seal lap joints and bolt connections and edge fillets for sheet notches and starter sheets. The sealant shall cure to a rubberlike consistency, have excellent adhesion to the glass coating, low shrinkage, and be suitable for interior and exterior use.

4.2.3 Sealant curing rate at 73°F and 50% RH.

4.2.3.1 Tackfree time: 6 to 8 hours.

4.2.3.2 Final cure time: 10 to 12 days.

4.2.4 Neoprene gaskets and tape type sealer shall not be used.

4.2.5 The sealant shall be Manus Sealer No. 98.

4.2.6 Due to poor compatibility with chlorine, the sealant Sika 1A shall NOT be used on water storage tanks. Sika 1A should only be used in special non-potable water applications.

4.3 CIM Coating

4.3.1 CIM coating shall be a two-component, high solids, elastomeric asphalt modified urethane.

4.3.2 CIM coating shall be applied by brush, roller, trowel, or squeegee. The coating shall be mixed and applied in accordance with the manufacturer’s recommendations.

4.3.3 CIM coating shall be classified for potable water contact and shall be certified to meet ANSI/NSF Additives Standard 61 for indirect additives.

5.0 RESPONSIBILITIES

5.1 Government Responsibilities. The Government will be responsible for draining each storage tank and removing all sediment prior to the Contractor commencing work. The Government will be responsible for filling the tanks after sealants are cured when the Contractor instructs the tanks to be filled for purposes of checking for leaks. The Government will fill the tanks according to the Fill Rate Chart in Exhibit E for a foundation sheet thickness of 0.344 inch. The Government will provide a restricted access worksite.

5.2 Contractor’s Responsibilities. The Contractor will be responsible for performing all work in Section 3.0 “Description of Work” unless clearly identified as the responsibility of the Government. The Contractor will be responsible for securing their equipment and supplies when not at the work site. The Government will not be held responsible for theft and vandalism that might occur.

6.0 QUALIFICATIONS OF CONTRACTOR

6.1 The Contractor shall be a licensed and insured general contractor certified by a glass-fused-to-steel tank manufacturer as an authorized dealer and shall comply with tank manufacturer’s requirements for repair and maintenance practices and equipment used on the job. The service and repair crew personnel shall be trained by the tank manufacturer’s sponsored program in all aspects of glass-fused-to-steel tank construction and repair and shall be certified by the tank manufacturer as having satisfactorily completed that program.

6.2 The Contractor shall be certified from a manufacturer specializing in the design, fabrication and erection of factory-applied glass-fused-to-steel, bolt together tank systems. The manufacturer shall employ a staff of full-time engineers, and shall own and operate its production plant, fabricate and glass coat the tank at one location. The Contractor will provide the physical address of the manufacturing facility, the contact name and phone number for the engineering department, and the number of years they have been in business at that location.

6.3 The Contractor must be licensed and insured in the state of New Mexico. The Contractor shall provide the following:

6.3.1 A list of five (5) glass-fused-to-steel water or wastewater tanks located in the state of New Mexico that they have repaired or serviced which have been operating for a minimum of ten years and a detailed description of the type of work that was performed; provide the name, address and complete contact information for the owner of the referenced tanks as well as the name, address and complete contact information of their consulting engineers.

6.3.2 Provide a detailed experience resume for each of the service and repair technicians who will be on site to service and repair the 3 storage tanks (service technician’s experience description shall be limited specifically to their history of glass-fused-to-steel tank service and repair work).

6.3.3 Provide certification from the tank manufacturer that the authorized Contractor meets all qualification requirements listed above.

7.0 SAFETY

7.1 OSHA. The Contractor shall comply with the applicable Occupational Safety and Health Administration (OSHA) Standards specified under 29 CFR part 1910 and other Federal, State, and local regulations for the purpose of providing safety precautions to employees who are subject to occupational exposure to falls, heat, overexertion, heavy lifting etc. as a result of the work performed under this contract.

7.2 Job Hazard Assessment. The Contractor shall provide a written Job Hazard Assessment (JHA). A JHA form will be provided by the BGNDRF Facility Manager upon request. Work cannot commence by the Contractor until the Contractor and Facility Manager have signed the JHA. Actions including personal protective equipment identified in the JHA are mandatory actions. The Contractor is responsible for each of his/her employees reviewing and adhering to the JHA before working at BGNDRF. The Contractor’s safety program can be submitted in lieu of a JHA as long as it addresses all hazards that the Contractor will be exposed to at the BGNDRF worksite.

7.3 Training and Education. The Contractor is responsible for providing the necessary training and education to his employees affected by the OSHA standards and ensuring safe and sanitary work conditions for his employees.

7.4 Personal Protective Equipment. The Contractor is also responsible for providing, at no cost to his employees, appropriate personal protective equipment such as, but not limited to, gloves, dust masks, and eye protection (reference section 1910.1030, Bloodborne Pathogens). Personal Protective Equipment is specialized clothing or equipment worn by an employee for protection against a hazard. General work clothes (e.g., uniforms, pants, shirts, or blouses) not intended to function as protection against a hazard are not considered to be personal protective equipment.

7.5 Safety Data Sheets. The Contractor shall provide the Facility Manager with all Safety Data Sheets (SDS) for any Contractor furnished chemicals brought to BGNDRF. The Contractor and the Contractor’s employees shall review SDS sheets for chemicals they are using. The Contractor must remove all Contractor furnished chemicals, sealants, and coatings from BGNDRF upon completion of the task in which it was required. The Contractor shall notify the Facility Manager when the Contractor furnished chemicals, sealants and coatings are removed from BGNDRF.

7.6 Covid-19 Protocols and Screening Questions. BGNDRF protocols for preventing the spread of Covid-19 are presented in Exhibit F and must be strictly adhered to. All workers associated with this project must pass the screening questions each day before being allowed on site. Protocols and screening questions are subject to change with the changing conditions of the pandemic. It is the Contractor’s responsibility to adhere to the restrictions put in place by the state of New Mexico and to stay abreast of any changes in restrictions at BGNDRF. Updates can be accessed at: https://cv.nmhealth.org/public-health-orders-and-executive-orders/

7.7 A date will be established at the BGNDRF pre-work conference for providing BGNDRF specific safety training to the Contractor and appropriate Subcontractors.

8.0 WARRANTY

8.1 The Contractor shall include a warranty for the tank materials and coatings used in the repair maintenance work. As a minimum, this warranty shall provide assurance against defects in material or workmanship for the period of 1 year.

9.0 SUBMITTALS

Submit the following vendor literature, safety data sheets, manufacturer’s specifications and warranty information to the Contracting Officer’s Representative (COR) for the Government’s review and approval prior to commencing work. Purchases prior to the Government’s approval of submittals is at the Contractor’s own risk.

9.1 Qualifications listed in Section 6.3 of this Statement of Work

9.2 CIM 1061 safety data sheet

9.3 Manus Sealer No. 98 safety data sheet

9.4 A Job Hazard Assessment or Contractor’s Safety Program as discussed in Section 7.2 of this Statement of Work

9.5 Warranty for the supplies and materials and work described in this Statement of Work.

10.0 FACILITY

10.1 Hours of Access. The Contractor will schedule work for when the facility is open. Business hours are from 7:30 am – 4:30 pm Monday through Friday. Any deviation from these days and hours must be requested of the BGNDRF Facility Manager 48 hours in advance. Scheduling flexibility may be required due to pandemic related issues.

10.2 Access to the Worksite. The Contractor will be responsible for signing in and out each day in the lobby of the Central Research Building.

10.3 Security. The Government reserves the right to perform security checks on Contractor employees.

10.4 Emergencies. Telephones in the building may be used in case of emergency. You must first dial 9 to access phone lines outside of the building. A telephone is in the lobby on the window ledge next to the door to the test bays.

11.0 CONTACT

Contracting Officer’s Representative (COR):

Zach Stoll, Acting BGNDRF Facility Manager 500 LaVelle Road Alamogordo, NM 88310 Desk Phone: 575-443-6559 Mobile Phone: 575-449-5622 Email: zstoll@usbr.gov

12.0 PERFORMANCE PERIOD

The performance period will be 9 months from date of award.

13.0 PAYMENT

13.1 Payment will be made upon submission of an invoice for the completion of work for each storage tank.