Anti-erosion works at upstream left bank of river Ganga near Birnagar area in Reach1 between Ch 1200.00 m and Ch 2420.00 (total working curve length 335.00 m) for the year 2025.

Amount

Supply of RCC (1:2:4) Porcupine (having 6 members each) of size of each member 0.10m x0.10mx 3.00 m reinforced with 4 (four) nos. of 8 mm dia M.S. rod & 6mm dia MS stirrups having 27 cm interval holes of 20 mm dia at 50 cm inside from both ends and in same face and in either face of post another two nos. of hole of size 20 mm dia at 65 cm inside from both ends including properly curing and supply at work site including assembling , laying on land , fixing & tying of bushes with G.I binding wire as directed.

Supplying fitting and fixing and tying the porcupine to each other by steel wire rope@ 6 mm per metre (GI Guy rope 6 mm Steel core) near the top and bottom third portion of each porcupine and anchored into the river bed and bank as necessary by using anchor block with anchor bolt with clamp as per direction of the Engineer-in-Charge.

Making cubical bamboo porcupine cages with bamboo of 60 mm to 75mm dia. having length of 2 metre each for all horizontal and vertical struts and 2.8 metre length for diagonal struts, 3 nos. horizontal and 3 nos. vertical struts should be placed equi-distant from each face to make the square cage of outer dimension 75 cm x 75 cm and projecting each strut by 60 cm on all directions. Two nos. diagonals or cross bamboo posts should be placed on each face having their centre tied with the centre of cage properly including fitting, fixing corners, vertical, horizontal and diagonal struts with iron nails not less than 20 cm long and tying corners with 16 SWG galvanized iron wire, filling in the cages with boulders / lump aggregates. Cages built with 10 SWG hexagonal or square pattern 10 cm mesh, with proper lapping, tying and sewing with 10 SWG GI wire including cost of all materials, carriage to site and laying the same in the bed or slope of the river, filling the same with the filler materials complete as per direction of the Engineer - in - Charge but excluding the cost & carriage of boulder / lump aggregate up to site. (N.B:- If G I wire netting is not considered then Rs. 348.00 per cage may be deducted from the following costs, towards cost of wire netting including OH and contractor’s profits.) For cages of size 75cm x 75cm x 75cm with boulder (a) Single cage

Supply of stone boulder at site including Royalty, loading, unloading, transportation, stacking, stacking unloaded boulder on private land all complete. Pakur source (Each weighing 25 kg & above)

Labour charges for dumping and placing in position properly filled in Nylon crates with filled in High-Density Polyethylene (HDPE) bags (minimum 21 nos. having capacity 50 kg) with local earth or sand, sewing and tying the crate with nylon wire within a lead of 150 m. and all lifts in river slope or bed by cutting trenches up to 50 cms depth, if necessary, or by boat including the cost of hire charges of boat, boatmen and other necessary equipment and also including cost of bags, Nylon crates, carriage and charge of filling bags with earth/sand as per direction of the Engineer – in – Charge. NB: The volume of each earth/sand-filled bag should not be less than 0.0328 m3 The size of the Nylon crate is 1 metre X 1 metre X 1 metre. (a) Where boats are necessary

Making and placing dip trees of single bamboo with branches (Minimum 8m. in each length and 7.50 cm. average diameter) tied by 10 SWG G I wire at 3 different locations of the bamboo with 3 nos. empty cement polythene bags filled with single boulder weighing 25kg to 35 kg in each bag and submerging the dip trees under water, tying the same at the bank on 1.5 m. long pegged bamboo pin (2/3rd. driven) with 10 SWG GI wire as per direction of the Engineer-in-charge including cost of all materials, hire charges of boat, labour charges, carriage of all materials etc. complete but excluding the cost of boulders and its carriage up to site.

M/s. Joy Durga Construction (BID ID -3211978)

HUMAYUN SK. CONSTRUCTION (BID ID -3211177)

B.B.R.C.UNEMPLOYED ENGINEERS CO-OPERATIVE SOCIETY LTD. (BID ID -3211516)