REPAIR OR REPLACEMENT OF EXTERNAL GI CI DI PPR PIPELINE AND REPAIR OR CLEANING OF UG SUMP, PS TANK, SWT AND ALLIED WORKS AT 509 SU, AT AF STATION LAITKOR PEAK UNDER GE (I) (AF) SHILLONG

Material and labour for cleaning of following RCC tank/masonary sumps/water reservoirs including scaffolding and necessary safety precaution, through 7 stages of cleaning and sterilization consisting of three stages of bacteriological screening done by Terbac-G10, Terbac-G5, Terbac-G65 and Ultra Violet ray process complete all as specified and as directed for the following :- Note 1 for cleaning stages:- Stage : I MECHANIZED DEWATERING : This First stage consists of emptying water from the tank. A submersible pump in used to drain the tank of excess of water. Removal of water and semi sludge with the help of Sludge pump (electrical/hydraulic). Stage : II SLUDGE REMOVAL : A sophisticated suction process is used to drain the excess sludge out of tank at a safe place away from tank. Removal of mud, sand and solid particles up to 4 inch size with the hydraulic sludge pupm. Stage : III HIGH PRESSURE CLEANING: The tank in then cleaned using high pressure jet machine. The rotary jet is used to clean walls and ceilings whereas plain jet is used to clean the corners of tank. the rotary jet acts as scrubber and can clean the most stubborn depositions. Cleaning of floor, walls and ceiling with the help of German made high pressure rotary jet pump having pressure range between 80-180 bars. Stage: IV MECHANIZED CLEANING: Mechanical scavenging using Eco-friendly. Health & Safety disinfecting chemical for removing rest over algae in water storage tank's walls to insure minimum harmful pathogens.

Item No 1.00 contd... Stage: V VACUUM CLEANING: The additional sludge and impurities are then removed by using a Heavy duty ubdustrial vacuum cleaner and are again disposed at a safer place away from the water tank. An industrial vacuum pump is then used to clean the leftover physical impurity from the floor. Stage: VI ANTIBACTERIAL SPRAY: After above steps of cleaning, the tank is treated with a food graded Antibacterial spray FDA recommended disinfecting chemicals to make it cpmpletely bacteria free and safe for use. Stage: VII 3600 UV STERILIZATION: The water storage tank is then treated with 3600 ultra-violet (UV) rediator to make it bacteria free and safe for stiring your drinking water. A specially developed 3600 UV Radiator is used to kill suspended or floating bacteria remaining in the tank. Cleaning should be done twice in a year in every six month or as per the direction of Engr-in-Charge (b) Company will submit Govt. laboratory test certificate of TERBAC-G5, TERBAC-G65, fix the sticker mentioning the date of cleaning & name of site and also provide certificate conforming the competion of sterilization of water tanks mentioning the name of station and date of cleaning. All the cleaning & sterilization should be under accidental insurance coverage.

Semi under ground Clear water sump 50000 gallons capacity 3.5 m in depth.

Semi under ground Clear water sump 30000 gallons capacity 3.5 m in depth.

Semi under ground Clear water sump 10000 gallons capacity 3.5 m in depth.

P & S overhead tank of 9600 gallons capacity

RCC overhead tank of 9600 gallons capacity

SWT of 11000 gallons capacity

Material and labour for cement concrete 1:4:8 type D2 using 40 mm graded stone aggregates as in PCC/Road cutting and in foundation or mass concrete if any with cleaning installation area etc complete all as specified.

M & L for preparation of old or previously treated internal and external steel/iron surfaces of over head pressed steel tanks and all steel surfaces of staging and applying one coat of anticorrosive synthetic enamel paint over a coat of red oxide primer complete including writing of capacity, tank cleaned date etc with white paint of letter size 15 cm on 60 cm x 90 cm size black paint background for 10 to 15 mtr height pressed steel tank including necessary staging complete all as directed.