UNDP/PAPP
Palestine Construction of the Khan YounisWaste Water Treatment Plant
Volume 2 – Part 2 – Technical Specifications – Civil Works
Palestine
Construction of the Khan Younis
Waste Water Treatment Plant
Volume 2 – Technical Specifications
Part 2 – Civil Works
TABLE OF CONTENTS
1.DESCRIPTION OF WORK
2.MATERIALS AND WORKMANSHIP
3.EXCAVATION, TRENCHING AND BACKFILLING
4.MANHOLES AND CHAMBERS
5.CONCRETE WORKS
6.MASONRY WORKS
7.PAINTING AND PROTECTIVE COATINGS
8.METALWORK
9.PROTECTIVE COATING, LINING And PAINT WORK
10.STEEL PIPES, VALVES AND FITTINGS
11.WELD INSPECTION AND TESTS
12.HYDROSTATIC PRESSURE TEST
13.CONCRETE MANHOLES
14.FINISHING WORKS
15.LANDSCAPING
16.BITUMINOUS CONSTRUCTION
17.CONCRETE BLOCK PAVING
- DESCRIPTION OF WORK
1.1 General Information
1.1.1Location of Site
The construction site for Khan Younis Waste Water Treatment Plant is located at eastern side of Khan Younis governorate beside Sofa crossing point.
1.1.2Adjoining Contracts
This contract is one of four contracts to be implemented separately under the ” Phase I, Khan Younis Wastewater Treatment Plant ”. These contracts are
1- Construction of Khan Younis Waste Water Treatment Plant (KY WWTP),
2- Construction of main pressure lines to the sea, and to the infiltration basins,
3- Construction of the infiltration basins in Al Fukhari, and
4- Construction of the electricalpower supply to the WWTP.
1.1.3Temporary Works
The Contractor shall take into consideration all temporary works he may require for the execution of the Works. He shall submit four (4) weeks in advance of any scheduled temporary work, detailed drawings and supporting calculations on stability, hydraulics or any other calculation considered essential by the Engineer’s Representative.
Within two weeks after submission of the afore-mentioned drawings and calculations the Engineer’s Representative shall comment or approve the relevant Temporary Works.
Notwithstanding the approval by the Engineer’s Representative of any temporary works, the Contractor shall remain responsible for their efficiency, safety and maintenance, and for all obligations in regards to such works specified or implied in the Contract until the removal of such works.
Unless provided for in the Bill of Quantities, expenditures whatsoever dealing with any temporary works shall be deemed to be covered by the other rates and prices in the Bill of Quantities and shall not be measured for payment nor be paid for under a separate item.
1.1.4Demolish And Dismantling Works
The Engineer’s Representative must be given at least two weeks notice in writing before demolition or dismantling of any existing obstruction on site or relocation of utilities. The Contractor shall require the approval of the Engineer’s Representative for the method and order of work and the steps taken to ensure the safety and stability of any remaining structures affected thereby. This approval by the Engineer’s Representative shall not in any way relieve the Contractor of his responsibilities in connection with carrying out the Works.
The Contractor shall dismantle carefully and handing over to the store or any place as directed by the Engineer’s Representative all the items specified in the Bill of Quantities.
No measurement will be required for this type of work, unless it is clearly specified in the Bill of Quantities. No payment shall be made for clearing, grubbing, demolition, dismantling, or relocation of utilities, unless it is clearly specified in the Bill of Quantities. Otherwise prices shall be deemed to be included in the various unit prices of the items of the Contract.
The average yearly rainfall in the eastern part of Khan Younis governorate is 200 mm which falls during the months of October to March. Rainfall intensities can very occasionally exceed 100 mm per hour, and when this happens flooding occurs in low lying areas.
1.1.5Datum Level
All levels (z co-ordinates) are referred to Mean Sea Level (MSL), which is (00.00).
The Contractor shall establish his own additional bench marks and control points needed under the Contract, all levels and coordinates on new control points shall be based on the level and coordinates of the main bench mark that will be handed to the contractor at the commencement of work by the Consultant.
1.1.6Co-ordinate System
The official grid system for Gaza is defined as the Palestinian Co-ordinate System.
1.1.7Local Material
Cement and reinforcement steel are imported from Israel and outside. Sources of supply of sand are from PalestinianTerritory. Sources of supply aggregates from West Bank via Israel and from Israel itself. The Contractor shall make his own investigations to secure the necessary supply of cement locally or imported and of aggregates for his operations during the full construction period. Mechanical parts, pumps, pipes and electrical equipment will most likely have to be imported. The contractor shall set all precautions to avoid delays of supply due to the frequent closure of the border to Israel.
1.2Scope of Works
The permanent works to be carried out within the scope of Construction of New Waste Water Treatment Plant facilities as shown in the contract drawings and in the BOQ and according to the relevant technical specifications.
1.3Phasing Of Works And Time Schedule
The Contractor shall on the basis of the indicated time schedule elaborate a detailed programme for the execution of the work given due consideration to his resources in plant and to his working methods. The programme shall show the interaction between activities and which activities are critical.
The Contractor shall take into consideration that The construction work for the InfiltrationBasins and the pressure linewill be carried out by other contractor and during the same period of the construction of the New Waste Water Treatment Plant facilities.
1.4Contractor’s Area
The Contractor shall make his own arrangements with local authorities or private landowners for any areas needed for his plant, equipment, material etc.
It is the Contractor’s responsibility to secure adequate supplies of water, sewerage disposal and electricity for his needs from the local authorities or to make his own arrangements therefore.
The Contractor shall also make his own arrangements for telecommunications.
Irregularities in water and electricity supply may be expected to arise, therefore the Contractor may need to provide standby power and temporary water tanks in order to be able to carry out the Works in accordance with his contractual obligations.
The Contractor shall make his own arrangements for collecting and disposing of sewage from his office and other facilities within the areas in his possessions to the satisfaction of the Engineer’s Representative.
1.5Field Laboratory
The Contractor may provide, set up and fully equip a field laboratory at the site. The laboratory shall be suitably located and of adequate size and layout to accommodate and operate all apparatus needed to carry out specified tests and to store samples, as required.
All necessary personnel and labour required for the efficient running and maintenance of the laboratory and its equipment shall be provided by the Contractor. An indication of the equipment required is given under section 2 of Materials and Workmanship. Apart from necessary requirements to run the laboratory to the Engineer’s Representative’s satisfaction, the laboratory shall include a separate lockable office room, fully furnished for one site engineer from the Engineer’s Representative’s staff.
If the contractor wishes not to provide a field laboratory as specified above, he may carry out specified tests at an independent laboratory approved by the Engineer’s Representative.
- MATERIALS AND WORKMANSHIP
2.1Standards And Codes Of Practice
This Technical Specification is not complete in the respect of covering all materials and type of works occurring under this Contract. It shall be seen as complementation/clarifications and/or replacement of relevant standards where this is deemed necessary, for the materials and works it covers.
If contradicting information between this Technical Specification and relevant standards should occur, this Technical Specification shall prevail unless otherwise directed by the Engineer’s Representative.
For materials and works not covered by this Technical Specification, relevant standards shall apply.
Depending on the origin of manufacture, materials complying with other well known standards will be accepted for incorporation in the works if deemed necessary by the Engineer’s Representative’s Representative, to be at least of equal quality as given by the specified standards. It is the objective, however, to standardize such installations and components that may eventually need replacement, to comply as far as possible with those already established in the Site.
One original set of the latest issue of all reference standards shall be available on Site for the use of the Engineer’s Representative at the start-up of the Works. These standards shall remain the property of the Contractor when the work has been completed.
Reference standards mentioned in the documents shall be regarded as minimum standards required. Where reference standards refer to other standards, code of practice etc., which are deemed to be necessary for execution of the Work, these standards, code of practice etc. shall also be handed over in original to the Engineer’s Representative’s Representative if so requested.
The publication in effect on the date of issue of Contract Documents, except when a specific publication date is specified, shall be the standards in effect for execution of the Works.
2.2Design Data
Work, for which the Contractor shall or may be required to design, shall be designed in accordance with American National Standards Institute (ANSI), and American Society of Civil Engineers (ASCE).
2.3Workmanship
The Contractor shall employ only adult skilled labours and workmen according to Palestinian Laws and regulations, who have the good experience in such projects, as included in the General Conditions and Specifications. The Engineer’s Representative has the authority to dismiss any of the contractor’s labours or workmen; he found that he is not suitable to work in this particular project.
2.4Laboratory and Testing Equipment
2.4.1Laboratory
The Contractor may choose to set up his own laboratory as indicated under 1.5 above. If he decides to do so, the laboratory shall be completed and operational at the commencement of the civil works.
Furthermore, the laboratory building shall be supplied with electricity, water and air conditioning, and shall have a concrete floor capable of adequately supporting all testing equipment etc.
2.4.2Staffing
If the Contractor chose to set up his own laboratory, he shall provide for the duration of the Contract:
- an engineer or technician fully experienced in directing and undertaking site and laboratory tests using the specified or other necessary equipment, and in preparing appropriate reports on tests carried out, including all necessary computations involved;
- a laboratory assistant, who has satisfactorily completed necessary education, capable of carrying out tests under the direction of the engineer or technician.
2.4.3Testing Equipment
The contractor shall perform all tests during the course of the Contract, as referred to in this Technical Specification in accordance with relevant Standard and Codes of Practice. The tests required in this Technical Specification mostly refer to American Society Testing and Material (ASTM). The Contractor may propose to substitute such tests and test apparatus to similar test and test apparatus of other well known standards, subject to the approval of the Engineer’s Representative.
Tests which shall be carried out frequently includes at least the following:
- Soil and Aggregate tests:
-dry density
-compaction (CBR)
-sieve analyses
-water absorption
-silt and clay content
-sulphate content
-chloride content
-acid soluble content
- Cement and Concrete Tests
- cement setting time
- water analysis
- temperature
- slump
- water-cement ratio
- cube, masonry block, paving block strength - Pipe Tests
- pressure pipe testing equipment
- gravity pipe testing equipment
2.4.4Field Equipment
At least the following equipment shall be provided exclusively for the supervision operations of the Engineer’s Representative:
- automatic levelling instrument with two staffs, labelled with inch on one side and cm/mm on the other.
- 50 and 100 m tapes
- templates, spirit level
- required nos. of 2 m pocket tapes
- 3 m straight edge
- marking flags, ranging rods, stakes, paint etc., as required
- any additional equipment in normal site use, required by the Engineer’s Representative from time to time.
- Furthermore, an electronic theodolite shall be available to the Engineer’s Representative when required.
2.4.5Lifting Equipment
The Contractor’s lifting equipment shall, before use on site and as may be required during the construction period, be inspected according to the Standard regulations of relevant authorities in the PalestinianTerritory.
2.5Approvals
2.5.1Approval of Material
The Contractor shall submit, for approval of the Engineer’s Representative, at least 21 days in advance of placing orders for any materials for incorporation in the Permanent Works, at least the following information:
- name of manufacturer or supplier proposed;
- sufficient evidence to prove that the materials proposed comply in all respects with the Specification and a declaration stating the Standards with which they comply;
- declaration that the materials will be supplied with the specified markings and certificates;
- manufacturer’s current instructions and explanatory data;
- details of fabrication and painting arrangements where appropriate;
- declaration that the whole quantity required to complete the work can be supplied from the same source, with written evidence if requested.
Within 14 days of the receipt of the request from the Contractor, the Engineer’s Representative will return to the Contractor with his eventual approval, or request for further information. After such further information has been provided by the Contractor, the Engineer’s Representative will, again within 14 days, return to the Contractor with his reply. This procedure shall be repeated until final approval has been given by the Engineer’s Representative.
Materials shall not be used in the Permanent Works until the Engineer’s Representative has given his written approval. Such approval shall not relieve the Contractor of his responsibility for the materials.
2.5.2Inspection and Testing on the Site
All materials delivered to the Site and workmanship on the Site shall be subject to inspection and testing by or under the direction of the Engineer’s Representative.
2.5.3Tests on Completion
Except where specifically agreed to the contrary in writing, the Contractor shall present all Plant and systems installed under the Contract for Tests on Completion, at least 14 days before the date for the Taking-Over Certificate for the Works. These tests are in addition to any works tests performed by the manufacturer and tests the Contractor may need to carry out in order to set up the systems to his own satisfaction.
Before the Contractor offers Plant and systems for Tests Completion, all associated systems and installations are to be complete, checked, adjusted and set up. Final paintwork must be complete. Tests on Completion shall not be carried out until the approved operation and maintenance manuals have been provided.
The Contractor shall submit to the Engineer’s Representative a detailed Schedule and Programme of Tests on Completion, to be agreed and completed 28 days before the commencement of testing.
Testing shall be carried out in the presence of and to the satisfaction of the Engineer’s Representative and in the presence of one or more representatives of the Employer, to demonstrate that the Plant and systems perform in accordance with the Specification and are ready for operation. Undertaking of the tests and demonstrations shall be the responsibility of the Contractor and all costs associated therewith shall have been included in the rates and prices.
The Contractor shall provide all rigs, test loads, instrumentation and labour assistance necessary for the proper performance of the Tests on Completion, and shall take and record such readings as are required.
Any defects discovered during the Tests on Completion shall be recorded by the Contractor and Engineer’s Representative and shall be duly rectified by the Contractor. Following rectification the Contractor shall repeat the tests before final handover of the Plant or system.
On completion of the Tests on Completion, the Contractor shall provide three copies of the Test Schedule completed for all observed tests and data readings. ATest Certificate shall be submitted in triplicate for signature by the Engineer’s Representative.
2.5.4Manuals
Except where specifically agreed to the contrary in writing, the Contractor shall provide comprehensive manuals in English, with those to be used by operators for operation and maintenance translated to Arabic, covering all aspects of operation and maintenance in respect of all Plant and systems installed under the Contract.
The Contractor shall submit the manuals in hard copies draft form at least 2 months before the date for the Tests on Completion. The Contractor shall make such modifications and additions as the Engineer’s Representative requires and shall re-submit the manuals for final approval by the Engineer’s Representative at least 14 days before the Tests on Completion are to be carried out.
The Contractor shall be entirely responsible for the consequences of any delay by the Engineer’s Representative in agreeing to commission the Plant and equipment where such delay is due to errors, omissions or defects in the documents submitted by the Contractor.
The Contractor shall make any further revision of the manuals required or agreed by the Engineer’s Representative and shall provide one original hard copy and five hard copies of each manual in addition to soft copy on CD within a period of 28 days after the Tests on Completion have been completed. The manuals shall clearly describe with step-by-step procedures and diagrams the starting up, running and shutting down of each item of Plant or system.
They shall contain sufficient information to permit the Employer to take over, operate and maintain the Plant or system efficiently and effectively. Full spare parts lists shall be included together with ordering procedures.
The manuals shall be of high quality in both presentation and technical content presentation and technical content. Manual not meeting this standard will be rejected.