Exploration / Drilling of Tubewell using Direct Rotary Drilling/ DTH Odex Machine including other accessories at IGC Lassipora Pulwama

Drilling of exploratory bore hole in 1st instance of not less than 125mm diameter at the selected site of proposed tube well up to a depth of 150 Mtrs. below ground level. In case sufficient/suitable water bearing strata is encountered to the satisfaction of the department at the drilling site , then production tube well shall be constructed on same spot after reaming to required size or in the vicinity, otherwise the contract will be closed and payment will be made for the exploratory borehole only. The job includes collection and preservation of soil samples in wooden trays after drilling of every 10 feet. The test bore is to ascertain the lithological nature/thickness and depth of the reliable water bearing horizon. Note :- Actual requirement and billing will be made as per site conditions. Payments will be made if it fails to yield water.

Transportation/Installation of drilling unit / equipments, tools and plants up to site of work through all kinds of roads, fields and approaches with lifts and leads complete in all respects. Erecting of drilling unit at identified site as per directions of engineer in charge. The job shall include the complete shifting charges of total machinery from source to Tubewell site at site of SIDCO which is around 55 Kms from Srinagar and dislodging after completion. The job includes development of site as identified which is included within scope of job and all manual handling ,storage and watch & ward. Also includes the Development of working platform at site and errection of Rig at spot by way of levelling, earth filling and, removing of all obstacles for complete levelling of machine for purpose of accurate verticality of bore hole. The job shall also include making of sumps for water hauling and disposal of excavated material through suitable water drains. The excavated material is to be refilled after completion of well.

After successful exploration of the borehole, Drilling/Reaming of explored bore hole from 125 mm to 600 mm by Direct rotary/DTH/ODEX method for construction of gravel packed tube well upto desired depth in alluvium formation/sedimentary rocks consisting of soils, clays, sand, gravel, boulders, in all kinds of soils, collapsible strata, saturated soils, artisan conditions etc. and retaining the borehole by using suitable drilling mud (Bentonite) including preparation and submission of strata chart of the tubewell constructed in the prescribed proforma for deciding tubewell casing etc. and including all works pertaining to drilling. Complete tube well construction done as per IS:2800 with upto date amendments. The job includes cost of all consumables, stores, water, bentonite mud, fuel, lubricants and charges on account of electricity, water hauling testing of vertical alignment...etc during the operation of the Drilling machine/Rig. The job is to be done as per the direction of engineer in charge at site.Note :- Actual requirement will be as per site conditions Depth 0 to 150 mtr

Supplying and fixing in position 300 mm dia ERW MS plain casing pipe as per the casing assembly diagramconforming to grade of IS:4270 of thickness 8.0 mm. with welded joints (welded on spot) with a coat of anti corrosive paint should be applied both inside and outside including Supplying and fixing of conical bail plug of MS blind pipe with close bottom plate at the bottom of casing assembly as per IS:2800 (part I 1991) including cutting, welding, fabricating, etc complete. Note :- The job includes length to length joining of pipe lengths by welding over v grove created by bevelling to ensure the robust jointing, Strengthening of pipe joints by welding of 4Nos. vertical MS stiffeners each of size 25mmx300mmx8mm. to avoid any mishap or shearing of the welding joints at high stress points.The job includes bevelling of pipes in case bevelling is not proper or is damaged during transit to be done by a grinder at site. The job also includes anchoring of pipe assembly lowered at ground level by suitable size channel iron lenths with M.S. round coller welded to the circumfrance of pipe assembly above ground level to avoid sinking. Note :- Actual requirement will be as per site conditions.The well assembly design will be as per the lithology prepared and as per the acquifer zones. Make - Jindal/Prakash Surya

Supplying and fixing in position 300 mm dia mesh wrapped Galvanized plain linear slotted pipes of thickness 8.0 mm with size and distribution of slots of approved pattern as per IS 8110 including cutting, welding, fabricating, etc complete Note :- Actual requirement and billing will be made as per site conditions Make - Johnson/Equivalent as approved by Engineer in Charge

Supplying and fixing of MS well cap of approved specifications, painted with anticorrosive paint etc. complete for casing pipe. After completion of job well should be properly capped with M.S. plate by welding to avoid any mishap

Providing and Shrouding of hard , insoluble and uniformity graded clean fine pea gravel duly sieved of size corresponding and suitable for slot size of liner assembly as per IS:4097 from specified source including transportation,stacking and washing, screening etc. complete 3.35 to 4.75 mm size for fine gravel and 4.75 to 6.3/6.3 to 8.0 for medium gravel. Packing of pea gravel done in layers of suitable thickness (screened and washed) in the annular space between outer wall of bore hole. The gravel should be free from silt, sand, clay and other river borne impurities. The job includes the cost of extraction of gravel from sindh nallah, transportation,loading unloading and shrouding of the same in drilled well at the site. Note :- Actual requirement and billing of the pea gravel around the tubewell casing will be made as per site conditions in addition ot supply and safe storage of pea gravel of 5.0 cum for future use.

Development of tube well using compressed air with capacity not less than 300 PSI air compressor as per strata conditions with contractors own equipments, viz, Air Compressor Machine, PVC Air pipes, MS Pipes, GI Pipes, bends, Rubber Gaskets,Nuts, Boltsincluding cost of POL for running the Air Compressor, other consumable items,etc needed for the job including Transportation/Shifting of Air Compressor, Air Pipes etc to site SIDCO for Ist 36 Hours. The Job includes the stabilization of tubewell with Air Compressor for sustainable discharge of the tube well over a longer period of time until clean/clear water free from silt, sand and other impurities/suspension is obtained after lowering of pipe and shrouding of gravel. Note :- Actual requirement and billing will be made as per site conditions

Subsequent Development of tube well using VT/Submersible Pump of sufficient capacity as needed as per strata conditions with contractors own equipments, viz,Submersible Pump, PVC/ MS Pipes, GI Pipes, bends, Rubber Gaskets,Nuts, Bolts including cost of Electrical Energy to run the Pump for running the Submersible Pump, other consumable items,etc needed for the job including Transportation/Shifting of Submersible Pump/ GI Column Pipes to site beyond Ist 36 Hours for another 50 Hours. The Job includes the stabilization of tubewell with over pumping by Vertical Turbine/Submersible Pump for sustainable discharge of the tube well over a longer period of time until clear water is obtained. Note :- Actual requirement and billing will be made as per site conditions

Conducting yield test of tube well by installing a Submersible test pump in the tube well temporarily and pumping out water continuously for a desired time period including collection of water samples for physico chemical analysis as per IS 2800 1979 and measuring the discharge and draw down of tube well at a suitable time interval including cost of energy, cost of installation of suitable measuring device and hire charges of pumping set of suitable pumping capacity. The contractor has to arrange V notch for assessment of the yield