Construction of Piezometer including installation of Digital Water Level Recorder with and Without Telemetry for Tirap OCP, Tikak Extension OCP and Margherita Area North Eastern Coalfields for compliance of condition of NOC received from CGWA

Amount

Preparatory work for carrying out drilling including surface dressing, making channels, mobilization & demobilization (1 No. for each 5 site)

DTH cum Rotary Drilling of 300 mm diameter borehole TPZ01- 75 m depth, TPZ02- 180 m depth, TKPZ01- 42 m depth, TKPZ02- 70 m depth, CHPZ01- 42 m depth

Provided 150 mm diameter medium duty GI blank casing TPZ01- 12.75 m TPZ 02- 85.75 m TKPZ01- 12.75 m TKPZ02- 28.75 m CHPZ01- 12.75 m

Provided 150 mm medium duty GI slotted casing with vertical slots (size:1.6 x 76 mm) with overall open area of minimum 10% - 15% TPZ01- 63 m TPZ 02- 95 m TKPZ01- 30 m TKPZ02- 42 m CHPZ01-30 m

Providing and fixing bail plug at the bottom of well of 150 mm diameter (1 No. for each 5 piezometer)

Providing and fixing of central guide (for 1 piezometer, TPZ02)

Lowering of casing (Piezometer Assembly) of 150 mm diameter into the borehole drilled TPZ01- 75.75 m depth, TPZ02- 180.75 m depth, TKPZ01- 42.75 m depth, TKPZ02- 70.75 m depth, CHPZ01- 42.75 m depth

Providing and filling of pea size gravel (quartz) of 3 - 5 mm diameter into annular space of well 300/150 mm diameter. TPZ01- 74 m TPZ02- 101 m TKPZ01- 41 m TKPZ02- 48 m CHPZ01- 41 m

Providing cement seal (2m), bentonite seal (2m) and sand pack (2m) for separating two aquifer zones after gravel pack. (6.0 m each for 2 piezometer, TPZ02 and TKPZ02)

Providing clay filling above cement seal upto ground level but below sanitary seal TPZ02- 72 m TKPZ02- 15 m

Development of piezometer using compressed air from suitable air compressor (5 Hour for each five piezometer)

Providing well cap with locking arrangement. 1" dia socket with plug to be fixed in the center of well cap. (1No for each five piezometer)

Providing sanitary seal of 1.0 m with concrete platform to protect the piezometer. (1 No for each Five Piezometer)

Pumping test of piezometers by running of air compressor for 5 hours (without any break) and recuperation of water level for next 5 hours (5 Hour for each five piezometer)

Provide Digital Water Level Recorder (DWLR) DWLR with Telemetry - 2 Nos DWLR without Telemetry - 3 Nos.

Total impact of GST for the purpose of CTC