CLEANING OF UG SUMPS, OVERHEAD WATER TANKS, FIRE TANKS, STATIC WATER TANKS AND TESTING OF WATER SAMPLES AND ALLIED WORKS UNDER GE (UTILITY-II) VISAKHAPATNAM

Amount

NOTES/INSTRUCTIONS FOR STRICT COMPLIANCE (a) The contractor shall obtain sample approval for all materials for incorporating in the work as per condition 10 of IAFW-2249 and Para-12 of Special Conditions of tender document mentioned here-in-after. (b) The GE may direct the contractor in writing to procure and deposit up to 80% of the material required for the complete scope of work. The decision shall be final and binding on the contractor. (c) The contractor shall deposit the procured material under intimation to GE to the store of concerned subdivision within 30 days from the receipt of written direction. Failure to do so shall result in a penal recovery of Rs 2000/- per week, levied on the dues of contractor, maximum up to 10% of the work done/CA Amount whichever is higher. (d)The contractor shall obtain approval of “Qualified Tradesman” as per condition 26 of IAFW-2249 before commencement of work at site and shall have sufficient manpower such as plumber, welder, helper etc readily available to meet the site requirement during emergency situation as per directions of Engineer-in-Charge/GE

NOTES(Contd---) (e) The quoted rates shall be inclusive of cost of necessary Tools, Plants, Safety Equipments, Machinery, Arrangements of Manual Dewatering/Dewatering pumps and Temporary lighting arrangements for work during night time etc as per site requirement. (f) The quoted rates shall be inclusive of cost for necessary scaffolding for working under AoR of GE (U-II).

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.

(Item No. 2.00 Continued...) (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. Notes for Item No. 2.00: (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.

(Item No. 2.00 Continued...) (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) 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 Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 2.5 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 2.0 LG (Lakh Gallons)

All as per Srl item No.2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 1.0 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.75 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.50 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.30 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.20 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.10 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Underground / Semi-underground sump of capacity 0.05 LG (Lakh Gallons)

All as per Srl item No. 2.00 here-in-before but RCC Overhead Reservoir of capacity 2.0 LG (Lakh Gallons) having staging height up to 20 meters above GL

All as per Srl item No. 2.00 here-in-before but RCC Overhead Reservoir of capacity 1.0 LG (Lakh Gallons) having staging height up to 20 meters above GL

All as per Srl item No. 2.00 here-in-before but RCC overhead water tank (Service tank) of capacity 40 KL on top of multi-storeyed building of S+9 configuration

All as per Srl item No. 2.00 here-in-before but RCC overhead water tank (Service tank) of capacity 25 KL on top of multi-storeyed building of S+9 configuration

All as per Srl item No. 2.00 here-in-before but RCC overhead water tank (Service tank) of capacity 20 KL on top of multi-storeyed building of S+9 configuration

All as per Srl item No.2.00 here-in-before but RCC overhead water tank (Service tank) of capacity 14 KL on top of multi-storeyed building of S+9 configuration

All as per Srl item No. 2.00 here-in-before but HDPE water tank (Service tank) of capacity 10 KL on top of building

Material and labour for cleaning of RCC/ Stone Masonry Static Water Tank / UG Sump of capacity 150 KL using the below mentioned process and applying two coats of cement base paint of approved colour on external surfaces of the tank including preparation of old painted surfaces and writing the capacity, date of cleaning and due date of cleaning in white letters on black background on front face of the water tank complete to the entire satisfaction of GE/Engineer-in-charge :- (i) DEWATERING : Dewatering shall be carried out through wash out pipe / using suitable dewatering pumps / sludge removal pump sets as per site requirement. (ii) SLUDGE REMOVAL : Removing of any type of sludge, accumulated mud, silt, sand, vegetation growth or any solid particles etc. from bottom surface and inner walls of tank with the help of sludge pumps or manually and disposing where directed. (iii) ALGAE REMOVAL : Removal of Algae, Calcinations etc from the walls with rotary cleaner/scrubber machine/wire brushes etc. (iv) INTERNAL WASHING : Washing of Walls and Ceiling with the help of high pressure jet cleaners using bleaching powder solution. (v) INTERNAL WHITE WASH : Applying one coat of white wash on internal surfaces of walls and bottom of tank.

(Item No. 19.00 continued...) Notes for BOQ Item No 19.00 : (i) Entire process of cleaning of Static Water Tank / UG Sump shall be carried out through any certified agency only, who has vast experience in field of cleaning OHR / UG Sump and having all requisite plant & machinery including safety equipment, required for the same. (ii) The contractor must produce all credentials / work experience of cleaning agency and get approval of accepting authority for carrying out complete job of cleaning of Static Water Tank / UG Sump, before commencement of job. (iii) All the equipment/material required for cleaning of tank shall be brought by the contractor and no extra cost will be paid in this effect. (iv) The contractor must intimate at least one week in advance for cleaning of tank / sump and only after approval of Engr -in-charge, the cleaning will be carried out. (v) The contractor must carry out all the process in such a way that the complete inside cleaning process as mentioned above must be finished in one day or within stipulated time as decided by Engineer-in-charge. (vi) The contractor must cater for all safety arrangement i. e. safety belts/ helmet / safety harness, shoes etc for working man power and inspecting staff and no extra cost will be paid in this effect. (vii) Certificate of tank cleaning mentioning each tank details shall be obtained from the tank cleaning agency and submitted to the department on successful completion of tank cleaning and before claiming the payment in RAR / FB.

All as per Srl item No. 19.00 here-in-before but of capacity 100 KL

All as per Srl item No. 19.00 here-in-before but of capacity 75 KL

All as per Srl item No. 19.00 here-in-before but of capacity 50 KL

All as per Srl item No. 19.00 here-in-before but of capacity 30 KL

All as per Srl item No. 19.00 here-in-before but of capacity 25 KL

All as per Srl item No. 19.00 here-in-before but of capacity 10 KL

Testing of water samples as per IS:10500 (Amended up to date) from any NABL approved / Govt laboratory tested for its parameters such as physical, chemical, and biological characteristics by collecting water samples from various water supply installations under the AoR of AGE E/M No. I (U-II). Original Test reports shall be submitted to Engineer-in-Charge. Water testing shall be carried out once in month and / or as directed by Engineer-in-Charge.

Supply and deliver Calcium Hypochlorite granules containing 65%–70% available chlorine by mass, packed in 40–45 kg drums, suitable for disinfection of drinking water. The material shall be free-flowing, free from foreign matter, and shall not introduce toxic or undesirable substances in treated and disinfected water beyond the acceptable limits prescribed in IS:10500 (2012). Each consignment shall be accompanied by a manufacturer’s Certificate of Analysis, batch number, date of manufacture, and proper labeling on drums indicating product details, net weight, and safety instructions complete all as specified by Engineer-in-Charge.

Supplying, fixing in repairs, testing and commissioning of Dial Type Water Level Indicator of size 3 feet diameter, 15 feet measuring capacity, suitable for underground sump or overhead reservoir, comprising the Dial made of 22 gauge GI casing, dust-proof, finished with two coats of zinc oxide primer and two coats of waterproof paint, fitted with 4 mm thick glass, rubber beading, and center pointer with locking arrangement complete with nylon line, counterweight, and stainless steel float including taking down existing unserviceable water level indicator of any description complete all as specified and directed by the Engineer-in-Charge.

SCHEDULE OF CREDIT Note :- Amount of Rs.1,500.00 indicated in Tender Documents as Schedule of Credit shall be deducted from the total quoted amount of BOQ.

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