GENERAL

Removal of existing damaged filter media from the bottom layer of the filter bed, from a depth of 4.0 meters. The removed sand mixed with mud stacked separately and disposed of at a designated location up to 150 meters away from the filter bed. Usable gravel (filter media) shall be carefully dismantled and stacked seperatedly for reuse. Dismantling and removal of damaged lateral pipes and manifold system, including breaking of surrounding concrete where necessary, using mechanical breakers. The dismantling shall cover both ends of the filter bed along the entire length of the manifold, ensuring complete removal of the existing underdrain system. The work includes all labour, tools, equipment, loading, unloading, and disposal operations, and shall be carried out as directed by the Departmental Authorities

Cleaning of removed filter media, divide into useful filter media and unuseful filter media, coarse sand and fine sand mixed with wet earth including grading of useful filter media into different required sizes by using sieves and cleaning with liquid chlorine to reuse including all labour charges etc. The processed materials shall be stacked separately based on size and type, in an orderly manner at designated locations within the site. Any damaged, degraded, or non-conforming material identified during processing shall be removed as directed by the Departmental Authorities.

Dismantling of existing structures like culverts, bridges, retaining walls and other structure comprising of masonry, cement concrete, wood work, steel work, including T&P and scaffolding wherever necessary, sorting the dismantled material, disposal of unserviceable material and stacking the serviceable material, with all lifts and lead of 1000 m as per Technical Specification Clause 202 MORD/MORTH (RBR-STCL-5) Clear Water Channel Slab.

(BLD-CSTN 2-13) RCC M- 20 Nominal Mix as approved by the department Concrete corresponding to IS 456 using WEIGH BATCHER / MIXER with 20mm size graded machine crushed hard granite metal (coarse aggregate) from approved quarry including cost and conveyance of all materials like cement, fine aggregate (sand) coarse aggregate, water etc., to site and including Seigniorage charges, sales & other taxes on all materials including all operational, incidental and labour charges such as weigh batching, machine mixing, laying concrete, curing etc.,complete but excluding cost of steel and its fabrication charges for finished item of work (APSS No. 402)with minimum cement content as per IS code from standard suppliers approved by the department including pumping, centering, shuttering, laying concrete, vibrating, curing etc. complete but excluding cost of steel and its fabrication charges for finished item of work. For M20 Culvert SLABS - above 150 mm - Up to 300 mm thick

(BLD-CSTN-2-18) Providing High Yield Strength Deformed (HYSD)/ Thermo Mechanically Treated (TMT) / Mild steel (MS) bars (Fe 415 grade as per IS 1786-1979) of different diameters for RCC works , including labour charges for straightening, cutting, bending to required sizes and shapes, placing in position with cover blocks of approved materials and size and tying and lap-splicing with binding wire of 18 SWG, forming grills for reinforcement work as per approved designs and drawings, including cost and conveyance of steel bars, including all wastages such as overlaps, couplings, chairs, spacer bars including cost and conveyance of binding wire, cover blocks and all incidental, operational, labour charges such as cutting, bending, placing in position, tying including sales and other taxes on all materials etc., complete for finished item of work. (as per amendment in 2011-12 SSR)

Handling, and placing RCC slabs of size 1.0 m × 0.45 m × 0.10 m from the prepared stacking area outside the filter house to inside the filter bed. The slabs shall be carefully lowered and positioned at a depth of 4.0 meters within the filter bed and placed accurately over the manifold/underdrain system as per the approved layout. Proper care shall be taken to ensure alignment, stability, and uniform placement of slabs without disturbing the underlying lateral pipe system. The work includes all lifting, lowering, positioning, labour, tools, equipment, and incidental charges, complete in all respects as directed by the Departmental Authorities.

Supply and delivery of 90 mm dia PVC pipes (6 kg/cm² pressure class) with ISI Mark forBottom and under drinage system of Filter Bed to collect the Filter water reaching down through the Sand and Gravel as directed by the Departmental Authorities.

Laying of Under drainage system - Providing, fabricating, and erecting a complete underdrainage system for efficient collection of filtered water passing through the sand and gravel layers. The system shall consist of a grid arrangement of 90 mm diameter PVC pipes (6 kg/cm² pressure class) laid along the center of the filter bed floor, forming the main manifold. Lateral pipes as per specification shall be installed perpendicular to the manifold at a spacing of 150 mm center-to-center, ensuring uniform distribution. The lateral pipes shall be provided with perforations of 12 mm diameter, arranged at 45° orientation, at specified intervals to ensure even collection and distribution of flow as per design requirements. The entire piping system shall be properly aligned, levelled, and securely fixed, including anchoring with concrete at both ends of the filter bed to maintain stability and position during operation. The arrangement shall ensure uniform flow distribution and consistent filtration rate across the entire filter bed area.

Supply, delivery and fixing of 90 mm Ø PVC End Caps fixing at end of the Every Lateral Pipe in Filter Bed as directed by the Departmental Authorities.

Providing, fabricating, and erecting a complete Air Distribution system for efficient Air distribution. The system shall consist of a grid arrangement of 32 mm dia PVC pipes (15 kg/cm² pressure class) shall be installed perpendicular to the manifold at a spacing of 150 mm center-to-center, ensuring uniform distribution of Air. The Air Distribution Pipes provided with perforations of 6 mm diameter, arranged at 45° orientation, at specified intervals to ensure even distribution of Air flow as per design requirements. The entire piping system shall be properly aligned, levelled, and securely fixed, including anchoring with concrete at both ends of the filter bed to maintain stability and position during operation as directed by the Departmental Authorities.

Supply, delivery and fixing of 32 mm Ø PVC End Caps fixing at Every end of Lateral Pipe in Filter Bed as directed by the Departmental Authorities.

Supply, delivery and Fixing of 25 X 32 MM RFTAs as directed by the Departmental Authorities.

Supply and delivery of 32 mmØ PVC elbows as directed by the Departmental Authorities.

Supply, delivery and fixing of 25 mmØ G.I Nipples with 75 mm length including one side Threading to connect 100mm dia Air Blower G.I.Main line and 32mm Ø PVC Air distribution pipeline etc., complete as directed by the Departmental Authorities.

Supply and delivery of 100 mm dia TATA B-Class GI Pipe for Air distribution main line including transportation, Unloading at Site etc., complete as directed by the Departmental Authorities.

Removal of existing damaged Air distribution main line and Laying with New 100mm GI Pipe laid along the centre of the Filter Bed on Manifold fixing with 25mm dia GI Nipples on both sides of Pipe at a spacing of 150mm Center to Center at specified intervals, laying concrete on both ends of Pipe Line to keep in position of Pipe including cost of Flanges, Tees and Bends as per requirement, welding, fixing in position from mainline to Manifold with all incidental charges as directed by the Departmental Authorities.

Supply and delivery of 80 mm dia TATA B-Class GI Pipe for Air distribution main line including transportation, Unloading at Site etc., complete as directed by the Departmental Authorities.

Supplying and providing of filter gravel of specified graded sizes, consisting of hard, durable, and preferably rounded stones with an average specific gravity of 2.5. The material shall be free from limestone, shells, clay, sand, loam, organic matter, and other deleterious impurities of any kind. The filter media shall conform to IS 8419 (Part 1): 1977 specifications. The work includes screening, washing, grading, loading, transportation (conveyance) from approved source to site, unloading, and stacking as required. The filter gravel shall be supplied in the following graded sizes:40–60 mm, 20–40 mm, 12–20 mm, 5–12 mm, 3–5 mm. Proper care shall be taken to ensure segregation and uniform placement of each layer as per design requirements. The work includes all labour, tools, equipment, handling, and incidental charges, complete in all respects, as directed by the Departmental Authorities.

12mm to 5mm Size

5mm to 3mm size

Supplying and providing of filter sand consisting of hard, durable, and clean siliceous grains, suitable for use in water filtration systems. The sand shall have a specific gravity not less than 2.5 and shall preferably consist of water-worn and rounded particles, ensuring effective filtration and minimum head loss. The material shall be clean, well-graded, and free from injurious substances, and shall not contain more than 5% by volume of impurities such as clay, loam, silt, dust, organic matter, or other deleterious materials. The filter sand shall conform to the requirements of IS 8419 (Part 1): 1977, including relevant grading and quality standards. The work includes screening, washing, grading, loading, transportation (conveyance) from approved source to site, unloading, stacking in the filter bed as per specified thickness and levels. Proper care shall be taken to ensure uniform spreading, levelling, and compaction (where required) to achieve the desired filtration characteristics. The work includes all labour, tools, equipment, handling, wastage, and incidental charges, complete in all respects, as directed by the Departmental Authorities.

Providing labour for laying, spreading, and levelling of new filter media (graded gravel) and filter sand in the existing filter beds. The materials shall be laid in specified layers, thicknesses, and sequence, ensuring proper gradation as per design requirements. Each layer shall be uniformly spread, levelled, and properly dressed to achieve the required bed profile and filtration efficiency. Care shall be taken to avoid intermixing of different graded layers during placement. The work includes all manual handling, positioning, levelling, dressing, and incidental operations, complete in all respects. All works shall be executed as per instructions and to the satisfaction of the Departmental Authorities.

Manufacture, Supply, delivery and fixing of Chlorinator ranging from 0 to 10 Kg/Hr with standard equipments of UNIK Series 2026 panel mounting Gravity Feed Chlorinator ranging from 0 to 10 Kg/Hr with Regulator, Pressure Gauge, Control Valve and Rota Meter controls connected with Anti Corrosive materials fixed in fibre board errection at Takkaleapadu 45 MLD New Plant.

Provision for Seignorage Charges

Towards Merit 2% on Seignorage Charges

Towards DMF 30% on Seignorage Charges

Provision for NAC @ 0.10%

Provision for GST @ 18%

Provision for TPQA @ 0.739 %

Unforeseen item