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8. DRAINAGE WORK
  1. The provision and clauses of preceding trades shall equally apply to relevant item of this trade.

  2. Rates for trench excavation for pipes shall include for deepening and widening the trench as necessary to enable the barrels of pipes to rest on firm ground and to facilitate jointing.

  3. Rates for rock excavation in trench excavations shall include for importing selected materials to replace any excavated rock which is unsuitable for back filling and for all additional rock excavation and appropriate filling beyond the maximum measurable in accordance with the specification.

  4. Rates for concrete beds and surrounds to pipes shall include for flexible joints and any necessary formwork where required by the specification.

9. WATER SUPPLY, SEWER AND DRAINAGE SYSTEMS

A. General Notes -
Extent of Work
A1 The extent of the work as provided for in this bill of quantities shall consist of all the items covered under item 2 of the Specifications. (Note)
A2 Rates for all items shall be inclusive of the following :
  1. Provisions of holes, chases .... etc.
  2. All necessary scaffoldings
  3. Contractor's overheads & profits
  4. Providing of samples, tests, specimens ... etc. for such items of work as required.
  5. All tax, levy or duty including BTT. (Note)

Water and Electricity
A3 It should bet he responsibility of the Contractor to ensure a continuous supply of water and electricity through the construction for the works, and obtaining necessary main connections prior to the date of completion.
B. General Preamble Notes
B1 Excavator
B1.1

Rates shall include for :

  1. Levelling bottom of trenches
  2. Backfilling with selected excavated material and consolidating.
  3. Dewatering as necessary
  4. Planking and strutting if required
  5. Working space as required. (Note)
B2 Contractor, Formwork, reinforcement and Masonry Work
B2.1 All the "Preamble Notes" given under similar headings elsewhere in this BOQ are applicable for this section also. (Note)
B3 Roof Plumber
B3.1 Rates for gutters & down pipes shall include for bends, sockets, solders, rivets, screws, clips, straps ... etc. for all vertical & horizontal runs and labour for hoisting and fixing. (Note)
B4 Plumbing and Drainage Work
B4.1 Rate shall include for al screws, nails, clips, saddles, brackets, thrust blocks or any such accessories required for the installation. (Note)
B4.2 Rate for piping shall include for all the bends, tees, cleaning eyes, reducers, junctions etc. and for testing of each length of piping. (Note)
B4.3 Rates for pipes laid underground shall include for necessary excavation to required gradient 1:3:6 (20 mm) mix concrete bedding, sand filling upto 300 mm above the crown of pipe, 50 mm protective cover slabs, backfilling and disposal of surplus excavated material. (Note)
B4.4 All the down runs and piping laid underground shall be of type 400/600 as directed. (Note)
B4.5 All the work shall conform to the requirements of the relevant local Authorities. (Note)

Sanitary Fittings
B4.6 Rate for wash basins, bidets, closets & bath tubs shall include for chromium plated taps, traps and flexible connections and stop cocks as required. (Note)
B4.7 Rates for sanitary fitting shall also include for back boards, brass screws, supporting brackets and fixing material as required. (Note)
B4.8 Glazed ware provided under this contract shall be new, without defects and of best quality, type and manufacture to the entire satisfaction of the Employers. As a standard of quality the contractor shall select from either "Twyford"/Ideal Standard" or an equivalent make. (Note)
B4.9 All the showers, mixers, taps etc used in sanitary fittings shall be of "GROHE" or an equivalent make. (Note)
B4.10 All the valves used under this Contract shall be of "PEGLER" or an equivalent Standard
and English Made.
B4.11 Rate for tiling work shall include all costs incurred by contractor in laying the tiles as
noted in the BOQ.

Rate shall also include,

(a) All materials including cement motar bed / plaster.
(b) Cost of tiles and ancillary materials.
(c) Standard grouting.
(d) Cover tiles in corners and edges or formation of corner by grounding.
(e) Cleaning prior to handing over.

Attention of contractors are drawn to the need to produced good workmanship in tiling as per the standard practice. Colours of tiles - grouting will be specified by Employer.

Pumps
B4.12 All the pumps used under this Contract shall be of "CENTRIC" or an equivalent make. (Note)

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