Providing sewerage scheme to Keylong Town in Tehsil Keylong District Lahaul Spiti HP

Detailed engineering survey, investigation, design and preparation of drawings i/c vetting from IIT for all pre faprecated structure civil structure, distribution / sewerage system for all zones, including field survey, levels, preparation of plans, hydraulic design, preparation of L-section, cross-sections, detailed drawings, submission for approval and complete in all respect as per specification and direction of the Engineer-in-Charge.(for Zone-I, II & III) (Refer Data Sheet No. 1)

Providing, designing (hydraulic & structural), supplying, installation, testing, and commissioning of a factory-fabricated following capacity Modular Sewage Treatment Plant (STP) based on Sequencing Batch Reactor (SBR) Technology (as per process flow diagram attached in the estimate) on turnkey basis including six (6) month test & trial, including structural steel fabrication, RCC foundation works, internal piping network, interconnecting pipelines, valves, gates, fittings, drains, walkways/pathways, handrails, access platforms, and all associated civil, electrical, mechanical, and instrumentation works required for complete functionality. Primary Treatment Units shall comprise Coarse Screen/Bar and fine Screen chamber, oil grease trap, sewage transfer pumps, sludge transfer pumps, Grit washing arrangement with lifting arrangement of washed grit, raw sewage holding tank , vortex grit chamer and distribution box etc. Secondary (Biological) Treatment Units shall consist of two numbers Sequencing Batch Reactor (SBR) basins complete with fine bubble diffused aeration system, air blowers, recycling of activated sludge, sludge holdiing tanks, Hypo dosing system, clear water tank, filter feed pumps, automatic decanter mechanism, PLC-based control panel with level sensors, and complete cycle automation. Tertiary and Sludge Management Units shall include Disc Filter for tertiary filtration followedby the ACF (activated carbon filtrartion), solar + DG heate, Chlorine Contact Tank with gaseous dosing system for disinfection including 5 cylinders of gaseous chlorination, 100 kg each, Online Continuous Effluent Monitoring System (OCEMS) at final outlet for all parameter, Final Effluent discharge arrangement, and sludge handling system comprising sludge feed pump, Screw Press (sludge dewatering unit), sump pump, reactor controllar, effluent tank, chlorine contact tank , sewage collection tank and Solar Sludge Drying Platform with filtrate return arrangement, complete with all required electrical connections, pumps, panels, control wiring, earthing, lighting, hydraulic interconnections, and mechanical fittings, beautification of plant, all designed in accordance with the latest CPHEEO Manual and relevant IS codes including IS 800, IS 456, IS 3370, and IS 1477, suitable for installation within the identified land space. The STP is designed to achieve CPCB/HPPCB/CPHEEO discharge standards (BOD < 10 mg/L, COD< 50mg/l, TSS < 20 mg/L, Total Nitrogen < 10 mg/L, phosphate < 5mg/l, PO₄ < 2 mg/L, and Fecal Coliform < 100 MPN/100 ml). All work shall be carried out in all leads and lifts and to the entire satisfaction of the Engineer-in-Charge.

Zone No. - I, Capacity = 0.34 MLD (Refer data Sheet No.-2) & (Refer to G.C.C. Chapter II,III,IV)

Zone No. - II, Capacity = 0.40 MLD (Refer data Sheet No.-3) & (Refer to G.C.C. Chapter II,III,IV)

Zone No. - III, Capacity = 30 KLD (Refer data Sheet No.-4) & (Refer to G.C.C. Chapter II,III,IV)

Sewere Network for all Zones nad other works :- (Sr.No. 3 to 39). Excavation in foundations, trenches etc. in earth work, lift upto 1.50 metres stacking the excavated soil not more than 3 metres clear from the edge of excavation and then returning the stacked soil in 15cm layers, when required in to plinths sides of foundations etc., consolidating each deposited layer by ramming and watering and then disposing of all surplus excavated earth as directed within a lead of 20 metres complete in all respects as per direction of the Engineer-in-charge. (Pick work 70% & Jumper work 30%)

Providing and laying reinforced cement concrete 1:1.5:3 (1 cement : 1.5 coarse sand : 3 graded stone aggregate 20 mm nominal size) in walls (any thickness), including attached pilasters, buttresses, plinth and string courses, fillets, columns, pillars, piers, abutments, posts and struts etc. above plinth level up to floor five level, excluding cost of centering, shuttering, finishing and reinforcement complete in all leads and lifts and to the entire satisfaction of Engineer-in- charge.

Providing and laying reinforced cement concrete 1:1.5:3 (1 cement : 1.5 coarse sand : 3 graded stone aggregate 20 mm nominal size) work in beams, suspended floors, roofs having slope up to 15° landings, balconies, shelves, chajjas, lintels, bands, plain window sills, staircases and spiral stair cases above plinth level up to floor five level, excluding the cost of centering, shuttering, finishing and reinforcement complete in all leads and lifts and to the entire satisfaction of Engineer-in- charge.

Providing and laying in position cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size) excluding the cost of centering and shuttering - All work up to plinth level in all leads and lifts and to the entire satisfaction of Engineer-in- charge.

Providing and laying in position of reinforced cement concrete 1:2:4 (1 cement : 2 coarse sand : 4 graded stone aggregate 20 mm nominal size ) excluding the cost of centering, shuttering, finishing and reinforcement - All work up to plinth level in all leads and lifts and to the entire satisfaction of Engineer-in- charge.