Anti-erosion measures to protect of erosion of Swarna river at Dowamokha Barigaon

Amount

Light Jungles: Clearing light jungles and trees up to 15 cm. girth including Cutting, uprooting roots and stumps, removing them from the site of the work, etc. complete as directed.( When 30% of the area is covered by shrubs, trees etc).

Earthwork in bank trimming to the designed section /slope including removing the soils at a safe distance, complete as directed.

Supply of Geo-textile bags of type-A (1.03X0.70M) made of Geo-textile non-woven fabricsheets of 400 GSM manufactured from 100% virgin Polypropylene (PP) fibre having thickness not less than 3.00 mm with minimum properties as (i) Tensile strength (CD) ≥ 24 KN/m (ii) Tensile strength (MD) ≥ 22 KN/m (ii) Mass ≥ 400.00 Gm/m ² (iii) CBR Puncture strength ≥ 4100 N/m2 (iv) Elongation @ break (Warp) ≥ 54% (v) Elongation @ break (Weft)≥ 52% (vi) Abrasion ≥ 70 % (vii) UV Resistance @ 500 hours ≥ 70% (viii) AOS ≤ 75 micron (ix) Permittivity ≥ 1.25, (x) Trapezoidal Tear Strength ≤ 520 N (xi) Permeability = 45Lt/m2/sec (xii) Seam strength = 80 % of geotextiles strength . Stitching of Bags should be Ring Spun Yarn stitches with 2500-3000 denier double line chain stitch with overlap with stitches along the edge @ minimum 15 stitches per 100 mm. (Bags are to be supplied of 100 numbers or part in a bundle, properly packed with name of Manufacturer and Batch Number is to be marked on each bag with “WRD Govt of ASSAM” to be printed on each bag and mentioning properly the GSM and type of Geo bag polymer. Test Certificate from approved NABL accredited and ISO Certified Laboratory should invariably be submitted against each batch of material).

Supply of galvd. Wire netting sheets made of 8G wire of 152mm(6”) square mesh in sheets of overall size 2.57 m x 1.66 m (8’-6”)x(5’-6”) including 76mm projection of each wire on all sides of 2.42mX1.31m(8’-5’) having knots of 12G at every joints including, loading, unloading and stacking properly Complete as directed by the Deptt.(weight of each sheet should not be less than 6.30 Kg.)

Supply of Sewing Thread/Yarn PPMF Stitching Thread (2000 Den. Kaplon) i/c payment of taxes.

Filling and laying of Geo bags of size 1.03m X 0.70m excluding excavation of specified silt from flood plain or adjacent chars within a distance of 90m of the work site, filling geo bags with silt having minimum weighing 126.00 Kg and minimum volume 0.084 cum after filling ,double locking chain stitching the mouth of the filled bags with polypropylene thread by power driven double needle double stitched machine, stacking the same in batches of 100, carrying the same to the dumping site including all handling charges and local carriage within a distance of 150m and laying properly as directed. (Geo Bag and Polypropylene thread will be supplied by the department free of cost) (Without boat)

Filling and laying in cage with silt filled Geo bags of size 1.03m X 0.70m including excavation of silt from flood plain or adjacent chars within a distance of 90m of the work site, filling geo bags with silt having minimum weighing 126.00 Kg and minimum volume 0.084 cum after filling ,double locking chain stitching the mouth of the filled bags with polypropylene thread by power driven double needle machine, stacking the same in batches of 100, carrying the same to the dumping site including all handling charges and local carriage within a distance of 150m and laying properly. in cages made of wire netting sheets of size 2.57x1.66m of 8G galvanized wire making the cage from 2 nos. of wire netting sheet by tying the projected wires complete as directed. (Geo Bag, Wire Netting Sheets and Polypropylene thread will be supplied by the department free of cost). Without boat.

Carriage of Geo bags including loading & unloading cost of P.O.L. Etc. complete and incluidng hire charge of truck with driver and handyman (For 50 to 150 Km).

Supply of R.C.C. Porcupine member of size 0.10m × 0.10m × 2.00m with cement concrete proportion 1 :2:4, reinforced by 4 Nos. of 8mm dia TMT bar. and 4mm dia (8G) wire stirrups at 15cm. C/C with 2 (two) nos. of holes of 20mm dia at 50 cm inside from both sides in the same face and in the other face of member another 2 (two) nos. of holes of size 20mm dia at 65 cm inside from both ends including properly curing for 28 days and supply at specific stack yard complete as directed.

Labour charge for launching of R.C.C./PSC Porcupine including carriage of R.C.C. / PSC porcupine members of size 0.10m × 0.10m × 2.00m from the stack yard to the place of launching ,erection of the Porcupine with 6 (six) members properly, supply & fitting/fixing with 12 mm dia , 25 Cm long M.S. Nuts and bolts and launching the porcupine properly as directed. (Lead up to 150 m) (Launching without boat.)

Local Carriage of Porcupine members by Diesel truck of 10 MT capacity including loading at stack yard and un loading at river bank up to an average lead of 10.00 Km and all lift, complete as directed.

SANJIB BORUAH

SOMESWAR DAS