Treatment of slope stability measures on upstream side of Dam, Chute Spillway and below Viewpoint area at Right bank of Tehri HPP.

Providing and fixing double scaffolding system (cup lock type) on the exterior side, up to seven story height made with 40 mm dia M.S. tube 1.5 m centre to centre, horizontal & vertical tubes joining with cup & lock system with M.S. tubes, M.S. tube challies, M.S. clamps and M.S. staircase system in the scaffolding for working platform etc. complete as per directions and approval of Engineer-in-charge. (DAR 2023 IT No-14.72)

Application of 150 mm Shotcrete M-25 in two layers 75mm each sandwiched with chain link fabric 50mmx50mm size including supply all material for shotcrete (Inclusive for rebound) and excluding the cost of chain link fabric, labour T&P etc for proper completion of the work as per drawing, Technical specification and the direction of Engineer-in-charge.(Approved Non SOR Item No 9)

Supply and installation of G.I. chain link fabric (2.7 mm wire dia with zinc coating 240 g/sqm) of 50x50mm size (Fe 500) including 2mm dia binding wire or nuts, bolts and washers as required for proper completion of the work as per drawings, Technical specifications and the direction of Engineer-in-charge. Made of G.I. wire of dia 4 mm for treatment of slopes as secondary mesh including all cost of material, labour, special labour T&P etc. for proper completion of the work in all respect as per drawings.(Approved Non SOR Item No 8)

Supply and installation of 300 mm thick Articulating Grouted Concrete Mattress, fabric form made from woven geotextile of minimum 400g/m2,having Wide Width Tensile Strength, ASTMD4595, (kN/m)=MD (50)/TD(50), Wide Width Elongation at Break, ASTMD4595, (%)=MD(>10)/TD(>10) and Trapezoidal Tear Strength ,ASTMD4533, (N)=MD(440)/TD(440) with reinforcing galvanized steel cables on both directions as per the detailed design, thickness and technical specifications. The mattress shall be customized as per site geometry or profile at factory in the form of panels along with geotextile baffles and one panel shall be connected with the adjacent panel by using Industrial Zipper. Cables shall be of minimum 6 mm diameter and the breaking strength of the cable shall not be less than 30kN, including all cost of material, concrete, labour T&P and special T&P to complete the work ina ll respect. (To be done on the river banks) (Approved Non SOR Item No 32)

Supply and installation of self driven hollow rock anchors of 38 mmm outer dia having the yield strength of 400KN i/c 200*200*10 mm base plate & all cost material, labour and T&P required in hilly slopes for length inside the rock profile but cost of cement grouting shall be paid separately.

Supply and installation of self driven hollow rock anchors of 38 mmm outer dia having the yield strength of 400KN i/c all cost material, labour and T&P required in hilly slopes for length outside the rock profile but cost of cement grouting shall be paid separately.

Cement grouting in SDA on pressure as per D&E deptt. Including all Materials, Labour and T&P required for proper completion of work.

Horizontal Drainage Boring methods on the types of Sandy Soil / Cohesive Soil and drilling length including cost of all materials, machinery, labour and all other ancillary operations etc. (Nominal Diameter of drilling pipe- 90 mm). (Nominal Diameter of drilling pipe- 90 mm) for length of 16.7 m. (Morth 2024-25 , Item No .7.11 D (ii) (d) , Chapter-7)

Supply and fixing of 76 mm Dia Perforated MS Pipe @ 10 M c/c staggered as per quotation.

Providing and fixing gun metal non- return valve of approved quality (screwed end) :80 mm nominal bore Horizontal (DAR 2023 IT No 18.19.6.1)