SPL REPAIR AND REPLACEMENT OF BOREWELL AND CONNECTED ITEMS AT CARIAPPA ENCLAVE AT PMS

M&L for Resistivity test to be carried out by Geological Departlment and report to be submitted before drilling the bore well complete all as specified and as directed. Note :- (i) Before drilling the bore contractor has to carry out site survey and electrical resistivity test/ survey for ground water exploration to be carried out of minimum 5 points for each borewell in and around said locations in area to obtain max ground water potential and report of the same has to be submiited to GE for taking approval of site/ point with maximum water poitential for boring. (ii) All necessary rrangment, test/survey done by the contractor and cost for same to be included in unit rate. No extra charge will be paid by the contarctor

Supply, lowering, assembling and fixing in position 250 mm dia, PVC M/F Sq threaded casing pipes conform to ASTM-D-1785 having inside dia 250 mm, Sch-80 and min wall thickness 15.06 mm complete including jointing of pipes with proper jointing materials as per IS in randam pipe length of 3 meter, including necessary fittings as required at site and necessary testing all as specified and directed by Engr-in-Charge.

Supply, lowering, assembling and fixing in position 200 mm dia, PVC M/F sq threaded casing pipes conform to ASTM-D-1785 having inside dia 200 mm, Sch-80 and wall thickness 12.7 mm complete including jointing of pipes with proper jointing materials as per IS in randam pipe length of 3 meter, including necessary fittings as required at site and necessary testing all as specified and directed by Engr-in-Charge.

Supply, lowering, assembling and fixing in position 200 mm dia PVC M/F sq threaded PVC ribbed screen casing pipepipes conform to IS:12818 having wall thickness 10.00 mm(min) complete including jointing of pipes with proper jointing materials as per IS in randam pipe length of 3 meter, including necessary fittings as required at site and necessary testing all as specified and directed by Engr-in-Charge.

Supplying and fixing in position of PVC M/F Adopter/Reducer of Size 250 x 200mm of complete all as specified and directed.

Drilling of trial bore hole by Direct Rotary Rig Method/Hydraulic rotary drilling (Reverse Circulation Method) according to IS:2800-1991 (Part-I) as amended upto date and modified to extent of specifiecation attached with this schedule of items of works in all kinds of soils & boulders upto 300 mm dia the cost of all consumable stores, fuel oil, soil stabilising, material arrangement & transportation of rig and other accessories to site of proposed bore and back including disposal of spoil from the site, for a depth upto 200 metes from ground level complete all as specified and directed. (Note - (i) The quoted rate shall deemed to be inclusive of the cost of drilling rig, pumps, fittings etc which shall be provided by the Contractor under his own arrangement for execution of the work). (ii) The quoted rate shall be deemed to be inclusive of the cost of Development of trial bore by reaming upto 525 mm bore for required depth from the normal ground level. (iii) Submission of Strata chart with sample box having soil strata of every 3 meter depth properly washed sample may be collected and kept in a sample box systematically alongwith complete details of New bore with Litholog Chart, is also deemed to be included in quoted rate. (iv) Rate quoted is also deemed to be included for M&L for sample strata box made out of 20 mm thick veneered particle board brown in colour and 12 mm thick plywood with 25mmx25mm aluminium angle 2mm thick base and over all length 1200mmx750mmx100mm with front glass sheet sliding type cover with aluminium frame all around with 02 Nos key holes plates of size 40mmx25mm and 3 mm thick complete showing name of tube well location and strata chart of ground data showing different type of strata and selection of casing pipe complete including painting with two coats of synthetic enamel paint over a coat of wood primer all as directed at site by Engr-in-charge.(v)Rate quoted is also deemed to be inclusive of rolled mild steel structure required at site for taking/pulling out of pump motor set as per general design for proper maintenance purpose .

Supplying and fixing in position mild steel well cap made of MS plate 8 mm thick with an internal threading and locking arrangement having opening for column pipe and submersible cable of 250 mm dia internal housing PVC pipe and centre guide bail plug, reducing socket and and necessary welding work as required at site for completion of the job complete all as specified and directed. (Note- (i) Rate quoted is deemed to be included for Necessary MS work required to be fixed well cap in position as directed at site as by Engr-in-charge. (ii) After completion of the work the cap will be used to keep the tube well closed untill the pump set is installed).

Yield testing for the tube well by suitable capacity submersible pump & motor for minimum dischraging capacity of 10000 gallons per hours for at least continuous 16 hours uninterrupted run per day for the continuous days compete all as specified and directed. (Note- (i) 'V' Notch and other equipment including pump set shall be arranged by the contractor at his own cost.

Development of tube well according to clause 9.3 of IS-2800-1991 :(part-I) as amended upto date and specificatios attached with air compressor of capacity 350 PSI/1000 Cum till sand/mud free water of potable quality is obtained and to achieve minimum discharging capacity of 10000 GPH complete all as specified and directed. (Note- Compressor with accessories and fuel, pipes etc shall be arranged by the Contractor and quoted rate is deemed to be included in item)

Testing of raw and treated water ( 02 samples @ Raw and treated water ) for all parameters covering complete Chemical and Bacteriological aspect from any Govt accredited/NABL certified lab/PHE as approved by the GE complete all as specified.