J.01_Grit_Line_Scope_of_Work.pdf

SCOPE OF WORK

Replacement of the Grit lines and the Installation of new Glass Lined Ductile Iron pipes in Precast Concrete Trench at South Bay International Wastewater Treatment Plant

The Contractor shall provide all labor, equipment, appurtenances, incidentals, materials and all required work and services to remove the existing underground 2-6” glass lined ductile iron pipes encased in concrete (where the new precast concrete trench is to be installed) and excavation of open trench to accommodate the installation of 40" width by 16" depth (inside dimensions) precast concrete trench system with solid bottom and removable covers. The project is located at the International Boundary and Water Commission (IBWC) International Wastewater Treatment Plant (IWTP) located at 2995 Clearwater Way, San Diego, CA 92154.

The clearing, surveying, demolition, removal, excavation, back fill, compaction, grading, pavement, testing and glass lined ductile iron pipes installation requirements shall be in accordance with the attached South Bay International Wastewater Treatment Plan (SBIWTP) Contract IBM 96-26 (CC-2) Specifications Sections 02050, 02110, 0220, 02500,15052, and15068. The installation of the precast concrete trench shall be in accordance with the manufacturer specifications and recommendations. The contractor shall provide and install two

8-inch glass lined ductile iron pipe with all required coupling and fittings inside the new precast concrete trench between the Grit Chambers and the Headworks Building. All attached information must be verified by the contractor. The contactor shall provide all equipment, labor and materials required to verify existing conditions as required for construction including but not limited to potholing, hand digging, field measurements and surveying prior to starting any work.

The contractor shall implement environmental controls in accordance with the attached SBIWTP Contract IBM 96-26 (CC-2) Specification Section 01641(Environmental Controls). The Contractor shall perform all required work and not limited to the following:

1. Perform all required clearing, excavation, demolition, removal and disposing of the existing underground two 6-inch glass lined ductile iron pipes encased in concrete between the Grit chambers and the Headworks where the new precast concrete trench system is to be installed. All materials and debris generated and not designated for salvage shall be legally disposed of by the contractor at the contractor’s expense. See attached drawings (C4, E9, D-A and D-B). All attached information must be verified by the contractor via potholing and hand excavation, field measurements and surveying as required prior to starting any work. The demolition and the remove of existing underground two 6-inch glass lined ductile iron pipes encased in concrete between the Grit chambers and the Headwork shall be in accordance with the attached SBIWTP (Contract IBM 96-

26) Specifications Section 02050 (Demolition).

2. Perform all clearing, surveying, excavation, backfill, compaction and grading required to complete the work as shown and specified on the attached drawings (E9 and Trenwa Inc. DWG. No. BHC4016-120 STD) and the precast concrete trench manufacturer installation specifications. The trench width and depth shall be sufficient to provide room for installing precast concrete trench with inside width of 40” and inside depth of 16”. The trench width and depth shall be minimized to greatest extent practical but shall conform to the manufacturer installation specifications and recommendations. All clearing, excavation, backfill and compaction required to complete the work shall be in accordance with the attached South Bay International Wastewater Advanced Primary Treatment Plant (Contract IBM 96-26) Specifications Sections 02110 and 0220 (Clearing, Excavation, and Backfill).

3. Provide and install a precast concrete underground utility trench system with solid bottom and removable covers (for mechanical piping). The manufacturer must have experience in design and fabrication of similar products and with facilities for fabricating them with the quality specified herein and without delay to the specified schedule. The trench system will consist of precast concrete U-shaped solid bottom bases and removable covers to be installed in earth trenches with covers extending to the surrounding surfaces. All sections of trench system including the steel reinforced concrete lids shall be designated for road crossing use and shall be designed to carry HS20, 32,000-pound axle loading and will be furnished in standard 10 foot lengths, except that special lengths will be furnished where required by the layout on the drawings. The trench shall have an interior clear cross sectional area of (40") wide x (16") deep. The trench will be approximately (53- 1/2") wide x (26-1/2") deep overall including cover. The trench shall not require cross braces to support the walls during backfilling. The covers will have slots for lifting tools and will be made of steel reinforced concrete. The precast trench system shall be designed and constructed so that neither the covers, nor temporary side-to-sides braces need to be installed to facilitate installation or subsequent machine backfilling and tamping. The trench system shall consist of precast concrete support brackets, sidewalls and removable covers and three access point assembled to form a completely enclosed trench. The trench system shall include tie Plate system to mechanically connect trench bases, Joint sealant to seal between trench bases and to seal around concrete lids, unistrut embedded vertically in both walls every 5' and expansion joints every 50 ft. The precast concrete trench system shall have three access points (three 24”X 24” access hatches Series W1S access door model No. W1S2424 by Halliday Products or equal). The precast concrete trench system shall be per attached Drawing No. BHC4016-120 STD as manufactured by Trenwa, Inc. (Patent #2862367); 1419 Alexandria Pike; Fort Thomas, KY 41075 or equal. The term "or equal" shall be understood to indicate that the "equal" product is the same or better than the product named in function, performance, integrity, reliability, quality, and general configuration. See attached drawings for Trench layout (E9, C4, C22, C24, M102, M106, M403, M405)

4. Provide and install two 8-inch glass lined ductile iron pipes with all required coupling and fittings per the attached Contract IBM 96-26 Specifications Section 15068. The two- 8-inch glass lined ductile iron pipes shall be installed inside the new precast concrete trench and shall be connected with the existing 6-inch glass lined ductile iron pipes at grit chamber in one end and with the 6-inch glass lined ductile iron pipe in Headworks at the other end. The two- 8-inch glass lined ductile iron pipes shall be tested in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 15052 (Exposed Piping Installation).

See attached drawings (E9, C4, C22, C24, M102, M106, M403, M405)

5. Provide and install additional asphalt pavement to eliminate the difference in elevation between the roadway pavement and top of the new precast concrete trench. Also provide and install additional select fill materials to eliminate the difference in elevation between the top of the new precast concrete trench and surrounding grounds. All asphalt pavement work shall be in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 02500 (Pavement). See attached drawing (D-C).

6. Provide and install two-6-inch new electromagnetic flow meters on the two grit lines at the Headworks. The electromagnetic flow meters shall be Enviromag 2000 made by Krohne or equal. Provide and install all required conduits, fittings and wires and connect the flow meters to SCADA system and update SCADA screen to reflect new flow meters. All installation and testing shall be in accordance with manufacturer recommendations.

7. The contractor shall submit all submittals to the Contractor Officer (CO) and Contractor Officer Representative (COR) in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 01341(Submittal Requirements).

8. The contractor shall be responsible for maintaining continued and uninterrupted operation of all facilities in the project area, including existing IBWC facilities, whether directly or indirectly affected by this Contract throughout the execution of this Contract. Also, the contractor shall cooperate with and coordinate his Work with the work of any other contractor, utility service company, Government employees performing work on the project site and vicinity, and Government’s plant operation and maintenance contractors. All coordination shall be through the COR.

9. At all connections and tie-ins to existing pipelines and structures, the contractor shall provide all materials, equipment, and labor including all temporary piping, pumping, and other equipment required to isolate and dewater existing pipelines and structures, and all fittings and transition pieces required to connect new piping with existing. Materials, locations and dimensions of existing piping indicated on the Contract Drawings are approximations only. The contractor shall field verify all materials, locations and dimensions of existing piping affected by or affecting his work, and shall make all modifications required including furnishing and installing all transition pieces and fittings required for a complete and operable system. The contractor shall report all field verified deviations to the COR. All connections with existing piping shall be made at a time, and under conditions, which will least interfere with operations affected by the contractor’s work and as authorized by the COR. The contractor shall provide facilities for proper dewatering and for disposal of all water removed from the dewatered lines and excavations without damage to adjacent property.

10. The contractor shall cooperate with others doing work in the area or who require access to various parts of the site. Whenever there is a schedule conflict or interference between access and/or work under these Contract Documents with access and/or work by others being performed for the Government on the project site and vicinity that cannot be resolved by reasonable cooperation and coordination as required herein, the COR shall decide the manner in which the work shall proceed, and the contractor shall cooperate in scheduling his work as required by the COR.

11. The contractor shall submit to the COR a site-specific safety plan for approval prior to the initiation of any work at the jobsite. The contractor shall comply with the attached SBIWTP (Contract IBM 05C0005) Specifications Section 01900 (Safety) requirements. The Contractor shall apply the latest edition of U.S. Army Corps of Engineering Safety and Health Requirements Manual EM 385-1-1, and latest edition of the Federal Occupational Safety and Health dministration,29CFR 1926, Construction Standards. All applicable Federal, State and local government safety rules and regulations shall be implemented by the contractor. All submittals shall be in accordance with attached SBIWTP (Contract IBM 96-26) Specifications Section 01341 (Submittals Requirements).

12. The Contractor shall provide daily reports of Project activity. Reports are to be submitted to the COR with all pertinent information pertaining to the project and shall include Number of employees, Subcontractor employees, Breakdown of employees by trades, Major equipment and materials installed, Major construction equipment utilized, Location of all areas in which construction was done, Materials and equipment received, Work and tests performed, Weather conditions, Safety, Delays and Instructions received. Submit two (2) copies of the contractor’s Reports. The daily report is due at the Governments field office by 9:00 a.m. the next working day after the work was performed and shall be signed by a responsible member of the contractor’s staff.

13. All work included under these Contract Documents shall be completed by the contractor, and fully operational within 120 calendar days after the Notice to Proceed.

14. The contractor shall submit all material required for the work for approval by the

COR before its installation. All submittals shall be in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 01341 (Submittal Requirements).

15. The Contractor shall submit to the COR before starting any work a project schedule and detailed construction plan for all phases of the project to include but not limited to demolition, disposal of debris, excavation of the trench, installation of pre-cast concrete box, backfill and compaction, installation of the two 8-inch glass lined ductile iron pipes, installation of the flow meters, tie-ins to existing pipelines and structures, testing, asphalt work, site grading and all clean up. The contractor shall comply with the attached SBIWTP (Contract IBM 05C0005) Specifications Section 01311 (Progress Bar Schedule) requirements. All submittals shall be in accordance with the attached SBIWTP (Contract IBM 96-

26) Specifications Section 01341 (Submittal Requirements).

16. The Contractor shall prepare and maintain progress schedule describing the sequence and duration of the activities comprising the Contractor’s plan to accomplish the Work within the Contract Times.

17. The contractor shall attend weekly progress meetings in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 01202 (Progress Meetings).

18. The contractor shall provide and submit to the COR operation and maintenance data in the form of instructional manuals for all equipment, systems, pipes and related accessories, electrical, instruments and control devices.

19. The Contractor shall apply the latest provisions of applicable standards to the work. Reference standards include, but are not necessary limited to the attached SBIWAPTP (Contract IBM 96-26) Specifications Section 01072 (Reference Standards).

20. The Contractor shall perform all cleaning in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 01710 (Cleaning).

21. The contractor shall maintain and provide to the COR for review and approval project record documents and as-built drawings that reflect the Project Work in accordance with the attached SBIWTP (Contract IBM 96-26) Specifications Section 01720 (Project Record Documents).

22. The contractor shall provide to COR all required warranties described in FAR 52.246-21 in writing prior to final acceptance of the work by the COR.

23. The contractor shall comply with the Contract closeout requirements in accordance with the attached SBIWTP (Contract IBM 96-26) Specification Section 01700(Contract Closeout).

24. The contractor shall provide and submit an itemized full detailed cost breakdown which shows as applicable 1) the estimated direct labor hours with hourly rates & labor burden for each category of labor, to include the title of each labor position;

2) the estimated cost of equipment, supplies, materials (quantities and unit cost), delivery and rentals with supplier quotes; 3) subcontracts with a like cost breakdown; 4) proposed Overhead and/or G&A; and 5) proposed profit. The detailed cost breakdowns shall be for all phases of the project to include but not limited to the followings; Clearing, demolition of existing ductile iron pipes encased in concrete; hauling and disposal of materials; Excavation; Backfill& Compaction; precast concrete trench installation; 8-inch G.L.D.I. pipes installation; meters installation& SCADA connection; surveying and grading;

paving; and all miscellaneous work. The contractor shall indicate the manufacturer/supplier that will furnish material, equipment and supplies for the work.

25. The contractor is advised that existing facilities at the SBIWTP are in service and are handling/treating wastewaters of sewage origin.

26. The work areas on the jobsite will be designated by the COR. The contractor’s personnel shall not be permitted in any area other than those expressly designated by the COR.

27. The Contractor shall comply with all USIBWC security programs requirements.

28. The working Hours shall be from 7:00 am to 5:00 pm Monday through Friday except holidays.

29. The contractor shall have a minimum of five (3) years of experience in works involving demolition, excavation, removal of buried piping, disposal of debris, installation of piping and underground trench work.

30. Attached list of additional relative Drawings from SBIWTP Contract IBM 96-26, additional Specifications and Drawings are available upon request:

C4, C8, C10, C22, C24, C28, C32, C33, C37A102, A401, E4, E5, E7, E8, E9, E10, I21, M401, M403, M404, M405, and S408.