CWE/AF AMB/AMB-T03/2026-27 PROVN OF BOREWELL IN TECH AREA AT AF STN AMBALA UNDER GE(AF) AMBALA

Material & Labour for drilling trial bore by rotary / reverse rotary method in any type of strata consisting of 250mm dia drill bit for depth upto 400 mtr in sequence from ground level as given below for borewells complete as per IS -2800 (Part -1):1991(Reaffirmed 2001). The following test and reporting will be carried out by the contractor and approved by GE complete all as specified & directed:- (i) Recording the water bearing horizon. (ii) Taking the samples from the bore well cutting for every 3mtr interval and every change in strata if less than 3 mtr. (iii) Preparation of litho logs based on these samples. (iv) Drill time log to be prepared and prescribed Note: - The depth of trial boring of the tube well at the site indicated by the GE is anticipated to be 350 mtr below ground level. The depth may, however, be ordered in writing to be varied by the GE up to a maximum of 25 % of the above mentioned depth (plus or minus). If the GE decided that suitable water bearing strata is not available in the aforesaid bore or the boring cannot be continued further on account of the type of strata met with, he may order the contractor to bore at other site(s) selected by the GE, until suitable water bearing strata is met with or boring cannot continue further on account of the type of strata met with provided the total number of bores (including the first bore) does not exceed two Numbers the decision of the GE shall be final & binding .The bore well work shall be start only after successful result of trail bore and approved by GE.

Material & Labour for development of trial bore to be drill by using suitable size of bit to accomodate 250 x 200 mm dia assembly pipes leaving 5" annular space around assembly pipes from 250mm to 675mm upto 60 mtr from ground level, complete all as specified & directed.

Material & Labour for development of trial bore to be drill by using suitable size of bit to accomodate 250x200 mm dia assembly pipes leaving 5" annular space around assembly pipes from 250mm to 525 mm from exceeding depth of 60 mtr but not exceeding 200 mtr below ground level, complete all as specified & directed.

Material & Labour for development of trial bore to be drill by using suitable size of bit to accomodate 250x200 mm dia assembly pipes leaving 5" annular space around assembly pipes from 250mm to 525 mm from exceeding depth of 200 mtr but not exceeding 300 mtr below ground level, complete all as specified & directed.

Material & Labour for development of trial bore to be drill by using suitable size of bit to accomodate 250x200 mm dia assembly pipes leaving 5" annular space around assembly pipes from 250mm to 525 mm from exceeding depth of 300 mtr but not exceeding 400 mtr below ground level, complete all as specified & directed.

Supplying and assembling including jointing, lowering & fixing in position plain mild steel sheet casing (ERW) pipe 250mm bore of thickness 8.0 mm confirming to IS: 4270-2001, pipe jointed and welded with coupler, Welding shall be done through out the circumference of the pipe and coupler rings both sides complete all as specified & directed .

Supplying and assembling including jointing, lowering & fixing in position plain mild steel sheet casing (ERW) pipe 200mm bore of thickness 8.0mm confirming to IS: 4270-2001, pipe jointed and welded with coupler, Welding shall be done through out the circumference of the pipe and coupler rings both sides complete all as specified & directed

Supplying and assembling including jointing, lowering & fixing in position stainless steel vee wire screen filter pipe 200mm bore of thickness 8.00 mm, confirming to IS: 8110-2000(Reaffirmed 2006), pipe jointed and welded with coupler, clamp as per manufacturers instructions, Welding shall be done through out the circumference of the pipe and coupler rings both sides complete all as specified & directed.

S&F mild steel reducing socket 250mm x 200mm including welding MS strip 40mm X 6mm (6 Nos) on each joint extended 100mm on each side complete all as specified & directed. Note :- The Wall thickness of the socket side shall not be less than 7.04mm)

M&L for chemical and bacteriological testing of water sample from approved NABL laboratory to ensure portability of water complete all as specified & directed.