Construction of 06 Nos. of Observation Wells (100 mtr. depth in soft Rock) in Bundelkhand(U.P)

Drilling of OW

Drilling of hole for OW by minimum 311 mm(12 1/4") dia R R Bit in soft rock formation to accommodate well assembly of recommended size i.e. 100 mm NB dia and gravel envelop of minimum 100 mm thickness, including sample collection for every 3m interval and preparation of lithology.

Supply and installation of ERW casing pipe confirming to latest version of IS:4270-2001 of 100mm (4") dia with thickness 5.4mm

Supply and installation of MS Slotted confirming to size as per Table 1 with slotting arrangement shown in Figure 2 of latest version of IS:8110-2000 of diameter 100mm (4") Normal size thickness 5.4 mm slot opening 1.5 mm

Supply and shrouding with pea gravel confirming to latest version of IS:4097-1967 with Particle size range 3.35 mm to 4.75 mm for 1.5 mm slot opening

Development by Air Compressor of adequate capacity for minimum 10 hours, over pumping and by other means till discharge water is clear and free of sand including collection of two water samples from OW adopting standard procedure in 1 litre HPDE bottle, along with video recordings of compressor hour meter, discharge etc.

Construction of cement concrete platform of patform of dimension 0.70 x 0.70 x 0.60m (0.30m above ground level) using concrete mix of 1:2:4 around the housing pipe welded with minimum 6 Nos of anchoring plate as per drawing

Supply and fitting of well cap as per drawing with Allen Keys. MS plate size 5 mm embossed & welded with permanent marking of "CGWB OW" for Observation wells should carved with welding on outer surface of casing pipe 0.5 mtrs.

Supply and installation of protection of Protection box along with Brass lock (7 lever hardened) and three keys for each lock as per drawing. Details of well to provided on Box as per format given by RD.

Preparation and submission of basic data report per site in triplicate along with site location map and approachability with land marks, photographs and videos of activities of drilling, assembly lowering, gravel measurement and gravel packing, well developoment using compressor and well water discharge using V notch during compressor development , well cap, protection box for each OW site, etc. The soft copy of BDR along with summary of wells details in xls format (as per proforma given by CGWB) including details of dia and depth housing pipe, assembly pipe, screen pipe, static water level, gravel packing depth and thickness, Litholog etc. should be submitted.

M/S SHIVAM TRADERS

Shiv Drillers