Annual maintenance contract for Cleaning of water tanks and reservoirs through hygienic and scientific methods at NEERI Nagpur

Amount

First Cleaning in a year (For first 6 month of contract) Cleaning of Under ground & Overhead water storage reservoirs and tanks of any height as per the hygienic & scientific methods of tank cleaning as per specification , procedure(attached in Annexure 'A' * and instruction of Engineer in charge . ( polythelene and RCC tank)

Storage Capacity more than 25000 - 1000000 Ltrs.

Storage Capacity from 500 to 5000 Ltrs.

Second Cleaning in a year ( For next six months of contract after completion of first cleaning) Cleaning of Under ground & Overhead water storage reservoirs and tanks of any height as per the hygienic & scientific methods of tank cleaning as per specification , procedure(attached in Annexure 'A' * and instruction of Engineer in charge . ( polythelene and RCC tank) arge . ( polythelene and RCC tank)

Storage Capacity more than 25000 - 1000000 Ltrs.

Storage Capacity from 500 to 5000 Ltrs.

Annexure 'A' Procedure to be adopted for Tank cleaning Stage I In the first stage of Tank cleaning involves the thoroughly cleaning of the manhole and surroundings full of dirt, mud and algae. Stage II The process further continues with cleaning of the walls and ceiling of the tanks by scurbbing and special high pressure jet which dislodges the layer of dirt and algae which sticks on the walls and ceiling of the tank. The cleaning of this tank fully removes the layer of calcinations and dirt. Stage III After cleaning of all the walls and the ceiling totally, the dirty water and sludge is removed using a special sludge pump. This pump disposes off the dirty sludge to any convenient and safe place outside the drinking water tank.

Stage IV After removal of major part of sludge the floor of the tank is to be thoroughly cleaned by the high pressure water jet removing all the remaining dirt and algae. The remaining sludge is again removed by high pressure vacuum pump and disposed off to a safe place. Stage V The next process is the treatment at the inside walls and the ceiling by disinficent agents like bleaching powder which ensures that the entire surface of the walls and ceiling is made totally sterilsed. Stage VI In the final stage, the cleaning of the tanks with UV Radiator which kills any further suspended or floating microrganisms that might have remained in the tank. Note:- Cleaning will be done twice in a year at the interval of six month with same process.

Note:- Contractor may visit the site before quoting the rates.Tools , plants, Dewatering pumps ,plumbing related damage and issues, sterilised boot, gloves including labour and material etc shall be arranged /provided by the contractor. Contractor has to quote and it should be inclusive of all safety precautions required for the work. Cleaning will be done twice in a year. Deductions for GST, Income tax, Building worker Cess and electricity charges as per actual consumption will be made from the bill. Second cleaning will be done six months after the first cleaning.

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