SOW_Eastside WWTP Sludge Tanks Lining_copy.pdf

United States Department of Agriculture

Research, Education, and Economics Agricultural Research Service

BARC Utility Manager’s Office Beltsville Agricultural Research Center, Building 426, Room 101

10300 Baltimore Avenue Beltsville, Maryland 20705-2230

USDA is an Equal Opportunity Provider and Employer

UNITED STATES DEPARTMENT OF AGRICULTURE

BELTSVILLE AGRICULTURAL RESEARCH CENTER

FACILITIES SERVICE

UTILITIES MANAGEMENT UNIT

BUILDING 426A, BARC-EAST

10300 BALTIMORE AVENUE

BELTSVILLE, MARYLAND 20705-2350

STATEMENT OF WORK

BARC Eastside WWTP Sludge Holding Tanks Lining

To furnish and Apply Internal Lining for the Plant’s Sludge Holding Tanks.

March 31, 2023

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STATEMENT OF WORK

PROJECT LOCATION:

Beltsville Agricultural Research Center (BARC), Bldg. 218, USDA Eastside Wastewater Treatment Plant (Westside WWTP), Beltsville, Maryland.

DESCRIPTION OF WORK:

1.0 GENERAL

1.1 Background

USDA, Beltsville Agricultural Research Center’s (BARC) Eastside Wastewater Treatment Plan (WWTP) is an Enhanced Nutrient Removal (ENR) activated sludge plant rated at an average daily flow of 0.62 MGD. Waste activated sludge from the activated sludge treatment process is transferred to two 180,000 gallons bolted steel tanks that have a dual role as aerobic digesters and sludge holding tanks.

1.2 Overview and Purpose of Statement of Work:

The Eastside WWTP Sludge Holding Tanks are 40 ft diameter glass-lined steel bolted tank. Walls of the tanks are 19 ft high with 3 ft of free board. The tanks are approximately 30 years old and are experiencing some deterioration in the steel and require lining with non-corrosive structural liner system to increase the tanks structural stability and prohibit further deterioration of the tanks. This statement of work is to furnish and install this liner system.

2.0 SCOPE OF WORK:

2.1 General

2.1.1 The contractor shall furnish and install/apply an OBIC Polyurea Lining System complete and operational for both tanks.

2.1.2 Work shall include all labor, materials, equipment and incidentals necessary and required for the lining system to be complete and operational as specified.

2.1.3 Manufacturer representative shall inspect the installed lining system for pinholes and other defects. All defects in the liner system which will or potentially affect the performance of the liner system as specified shall be immediately repaired per the manufacturer representative. All repairs shall be performed at no additional expense to the Owner.

2.1.4 The existing tank plans are enclosed for the contractor to understand the tank layout, and construction and dimensions.

2.1.5 The lining system shall be installed based on the enclosed specifications.

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2.2 Performance Requirements

2.2.1 The main goal for the use of this lining system on the tanks is to protect the tank steel structure from further corrosion caused by the corrosive nature of the liquid it holds (wastewater sludge). To fully protect the tank steel structure, the liner system shall be completely free of any defects, holes or imperfections that could lead to the sludge reaching the steel of the tanks behind the liner system.

2.3 Warranty

2.3.1 The liner system materials and installation shall be guaranteed free of defects by the manufacturer and installer for a period no less10 years from the installation date.

3.0 GENERAL AND ADMINISTRATIVE REQUIREMENTS

3.1 Work Included

3.1.1 The contractor shall furnish and install/apply a Tank Lining System complete and operational for both tanks per the provided specifications.

3.1.2 Work shall include all labor, materials, equipment, and incidentals necessary and required for the lining system to be complete and operational as specified.

3.2 Unit Responsibility

3.2.1 Furnishing and applying the liner system shall be the sole responsibility of the Contractor.

3.3 Qualifications and Quality Assurance

3.3.1 The Contractor or Subcontractor responsible for the installation of the tanks lining system shall be certified by the lining system materials manufacturer

3.3.1.1 Provide Manufacturer Certification of application company training and approval of application equipment.

3.3.1.2 Provide Manufacturer Certification of individual applicators certifying that the applicator received the required manufacturer's training and is certified by the manufacturer to apply their product.

3.3.2 Submit to the Engineer certified test data and a letter of certification from the manufacturer that states the liner system material conforms to the specification requirements.

3.3.3 Materials shall conform to the Lining System Manufacturer’s most recent product Technical Data Sheet information.

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4.0 Safety Requirements

4.1.1 Safety is the first priority on this work site and tank projects are no different.

Proper safety procedures must be followed when working in and around tanks.

4.1.2 Many tanks are considered confined space. The tanks to be lined shall be evaluated by a competent person to determine if the tank can be entered and what safety procedures should be followed for entry. Should the tank be determined to be a Confined Space the following should apply:

4.1.2.1 Workers shall be trained in confined space entry procedures. Entry hazards shall be evaluated, and workers shall be informed of these hazards.

4.1.2.2 A written confined space entry plan shall be prepared and implemented as appropriate for work.

4.1.2.3 Before and during tank entry, the atmosphere shall be tested for oxygen content, flammable gases, and toxic air contaminants.

4.1.2.4 At least one attendant shall be provided outside the permit space into which entry is authorized for the duration of entry operations.

4.1.2.5 Forced ventilation shall be supplied, if required.

4.1.3 Hazardous atmosphere: This is of particular concern for enclosed tanks. When air flow is restricted, dangerous gases can accumulate or be generated when completing surface preparation and lining installation.

4.1.4 Fall Hazards: Scaffolding, ladders and other equipment can present fall hazards. Personnel should be trained in the proper installation and use.

4.1.5 Engulfment: Be certain Lockout Tagout procedures are used to insure no accidental filling of the tank will occur during the construction period.

5.0 Submittals

5.1.1 Schedule submittals well in advance of the need for the material or equipment for construction. Allow time to make delivery of material or equipment after submittal is approved.

5.1.2 Develop a submittal schedule that allows sufficient time for initial review, correction, resubmission and final review of all submittals. The OWNER will review and return submittals to the CONTRACTOR as expeditiously as possible and within a maximum period of two weeks.

5.1.3 Within one week of contract award and notice to proceed (NTP), the contractor shall submit all administrative submittals. Administrative submittals shall include but are not limited:

5.1.3.1 Project schedule

5.1.3.2 Schedule of values

5.1.3.3 Submittals schedule

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5.1.3.4 List of subcontractors (if any)

5.1.4 Submit administrative submittals in accordance with the requirements of this statement of work.

5.1.5 Submit Shop Drawings in accordance with the requirements of the specifications for the liner system.

5.1.6 The OWNER’S review of submittals covers only general conformity to the contract documents. The CONTRACTOR is responsible for any errors, omissions, or deviations from the Contract requirements. Review of submittals in no way relieves the CONTRACTOR from his obligation to furnish required items according to the contract documents.

5.1.7 Submit five (5) copies of documents unless otherwise specified in the contract documents. In addition, one electronic copy of each submittal shall be furnished to the OWNER.

5.1.8 Action Submittal Dispositions: OWNER will review, mark, as appropriate, and distribute marked-up copies as noted:

5.1.8.1 APPROVED: CONTRACTOR may incorporate product(s) or

implement Work covered by submittal.

5.1.8.2 APPROVED AS NOTED: CONTRACTOR may incorporate

product(s) or implement Work covered by submittal, in accordance with ENGINEER’s notations.

5.1.8.3 PARTIAL APPROVAL, RESUBMIT AS NOTED: Make

corrections or obtain missing portions, and resubmit. Except for portions indicated, CONTRACTOR may begin to incorporate product(s) or implement Work covered by submittal, in accordance with OWNER’s notations.

5.1.8.4 REVISE AND RESUBMIT: CONTRACTOR may not

incorporate product(s) or implement Work covered by submittal.

5.1.9 Distribution of all submittals will be made as follows: Four copies of the furnished submittal will be retained in OWNER’s file. Remaining copy returned to CONTRACTOR appropriately annotated.

5.1.10 Apply CONTRACTOR'S stamp, certifying that the items have been reviewed in detail and are correct and in accordance with Contract Documents, except as noted by any requested and approved variance. As a minimum, Contractor's Stamp shall include:

5.1.10.1 CONTRACTOR'S name.

5.1.10.2 Certification statement that the CONTRACTOR has reviewed the submittal and it is in compliance with the Contract Documents.

5.1.10.3 Signature line for CONTRACTOR.

5.1.11 Provide Quality Control Submittals as follows:

5.1.11.1 Operations and Maintenance Data and manuals.

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5.1.11.2 Manufacturer’s Certification of Compliance that the supplied liner system is identical to the requirements of these specifications.

5.1.11.3 Manufacturer’s Certificate of Proper Installation.

5.1.11.4 Manufacturer’s certification of proper installation as specified.

5.1.11.5 Manufacturer field inspection, installation verification and testing

Report.

6.0 Project Communications

6.1.1 All communications shall be through the Project CO and the Project COR and their designees.

6.1.2 Acceptable forms of communications include Emails, Letters, and Telephone Memoranda

7.0 Project Schedule

7.1.1 Within a week of project award, the contractor shall submit project schedule with the following Milestones:

7.1.1.1 Shop drawings submittal within 4 weeks of NTP

7.1.1.2 Liner System delivery within 8 weeks of NTP

7.1.1.3 Start and finish date of liner system application to tank #1

7.1.1.4 Start and finish date of liner system application to tank #1

7.1.1.5 Dates of manufacturer representative application inspections

7.1.1.6 Manufacturer Installation Certification date

7.1.1.7 Owner’s training and instructions dates

7.1.1.8 Project closeout date

8.0 Progress Meetings & Reporting

8.1.1 A Progress Meeting shall be held with BARC Representatives once a month during project execution and at all Project Milestones.

8.1.2 At every progress meeting shall provide a month look ahead schedule and fully go through activities completed last month.

8.1.3 A Progress Report shall be submitted to BARC Representatives monthly and with each billing cycle/invoice.

9.0 Quality Requirements

9.1.1 Quality procedures outlined above shall be followed and records submitted to BARC Representatives with every milestone.

10.0 Change Management

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10.1.1 No changes to the scope of work will be accepted without a written approval of BARC Representatives

11.0 Project Resource Management

11.1.1 Changes to project team personnel shall be approved in advance by BARC Representatives

12.0 Construction Security Requirements

12.1.1 The contractor shall be responsible for the security of all their materials and equipment.

13.0 Operations and Storage Areas

13.1.1 The contractor shall only utilize the space agreed upon with BARC personnel for their operations and storage of materials and equipment.

14.0 Site Cleanliness and Waste Disposal

14.1.1 The Contractor shall be responsible for the site cleanliness as well as for the disposal of any construction operation waste at their own cost. Waste storage bins are permitted at the location designated by BARC representative.

15.0 Protection of Existing Vegetation, Structures, Equipment, Roads and Utilities

15.1.1 Existing vegetation, structures, equipment, roads, and utilities at the construction site shall be protected by the contractor at all times during construction. Any damage to any of these items shall be restored by the Contractor to its original or better condition.

15.1.2 No disturbance of the wastewater treatment plant operations shall be permitted.

16.0 Contractor’s Temporary Facilities

16.1.1 The contractor shall provide temporary facilities for their personnel including toilets.

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