REPAIR MAINT OF WATER SUPPLY INSTA WATER TREATMENT SYSTEM CLEANING OF UG SUMPS OF DIFFERENT CAPACITIES TESTING OF WATER SAMPLES AND OTHER CONNECTED MISC WORK AT MEGHADRIGEDDA 104 BPH MEGHADRIPETA AREA WITH CERTAIN WS WRKS UNDER GE U II V

Material and labour for cleaning of fresh water storage tanks of RCC Underground / Semi-underground sump of capacity 3.0 LG (Lakh Gallons) by adopting a seven-stage cleaning process as given below and writing Date of cleaning, due date of next cleaning, and name of cleaning agency (as approved by GE) shall be written legibly on the name plate of the sump/tank after completion complete all as specified and directed by Engineer-in-Charge:- (i) Dewatering : Dewatering of sump/tank through washout pipe or by using suitable dewatering/sludge removal pumps as required at site. (ii) Sludge Removal : Removal of sludge, mud, silt, sand, vegetation growth or solid particles from bottom surface and internal walls, manually or with sludge pumps, and disposal to a distance exceeding 50 m but not exceeding 100 m away from installation boundary/fencing and spreading in low-lying areas. (iii) Algae Removal : Removal of algae, calcination, etc., from inner surfaces using rotary cleaner/scrubber machine/wire brushes ensuring thorough surface cleaning without damaging the RCC structure. (iv Internal Washing : Washing of internal surfaces including walls, bottom, and ceiling of the RCC underground sump shall be carried out using high-pressure jet cleaners. The cleaning shall be performed with a solution of Sodium Hypochlorite (NaOCl) prepared in water at an appropriate dilution, ensuring effective removal of microbial contaminants, algae, and biofilm without damaging the RCC surfaces. Adequate contact time shall be maintained for effective disinfection, followed by thorough rinsing with clean potable water to remove any residual disinfectant. (v) Anti-Bacterial Treatment : Sterilization of internal surfaces with anti-bacterial Hydrogen Peroxide (H₂O₂) and Silver Ion solution uniformly applied to walls, floor, and ceiling using spray equipment to ensure complete surface coverage. After application, a minimum contact time as per manufacturer's recommendations shall be maintained to ensure effective sterilization. The treated surfaces shall then be thoroughly rinsed with clean potable water before recommissioning the sump. (vi) Vacuum Cleaning : Final removal of residual sludge, silt, and deposits with high-capacity industrial vacuum cleaner to ensure a clean and debris-free sump interior. (vii) UV Treatment : Sterilization/disinfection of tank with UV lamp for minimum one (01) hour to ensure bacteria-free condition.

(Item No 1.00 Contd---) Notes :- (i) The entire process of cleaning of OHR / UG Sump / Service Tank shall be carried out only through a certified agency with proven experience in this field. The agency must possess all requisite plant, machinery, and safety equipment. (ii) The contractor shall produce all credentials and work experience of the cleaning agency. Approval must be obtained from the accepting authority before commencement of the job. (iii) All equipment/material required for cleaning shall be brought by the contractor. No extra payment will be made for the same. (iv) The contractor shall intimate at least one week in advance regarding cleaning. Cleaning shall be carried out only after approval of Engineer-in-Charge. (v) The outlet of the tank shall be temporarily blocked before commencement of cleaning to prevent sludge/silt from entering and choking the outlet pipeline. The outlet shall be cleared after completion of cleaning. (vi) The cleaning process must be completed in one day or within the time stipulated by the Engineer-in-Charge to minimize disturbance to regular water supply. Failure to restore water supply within the stipulated time will attract a penal recovery of Rs. 2000/- per day from contractor’s dues. (vii) The contractor shall provide all safety arrangements (safety belts, helmets, harnesses, shoes, etc.) for manpower and inspecting staff. No extra cost will be paid on this account. (viii) Cleaning of the surrounding area, grass cutting, and removal of minor bushes/roots of dead trees within 5 m radius from plinth protection shall be carried out by the contractor. The cost is deemed to be included in the quoted unit rate and no extra payment will be made on this account. (ix) Trimming of tree branches (up to 15 cm girth) covering the roof of OHR / UG Sump or within 5 m radius from plinth protection shall be carried out by the contractor. The cost is deemed to be included in the quoted unit rate and no extra payment will be made on this account. (x) Applying one coat of white wash on internal surfaces of walls and bottom of tank. (xi) A certificate of tank cleaning (mentioning details of each tank) shall be obtained from the cleaning agency. The certificate must be submitted to the department on successful completion of work and /or before claiming payment in RAR / FB.

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 2.5 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 2.0 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 1.5 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 1.0 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.4/0/5 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.20/0.30 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.10 LG (Lakh Gallons)

All as per item No. 1.00 here-in-before but RCC Overhead Reservoir of capacity 1.5 LG (Lakh Gallons) having staging height up to 20 meters above GL