TNPGCL- Proposed comprehensive rehabilitation/ reconstruction and raising of NCTPS Ash Dyke Bund to cater the ash disposal needs of upcoming Ennore SEZ STPP (2x660MW) in addition to the existing NCTPS Stage-I, II and III- on EPC basis.

Conducting detailed topographical and contour survey, collection of field data, Design , detailed Engineering , preparation of construction drawings based on the stability analysis done by IIT Madras , and as-built drawings for Ash Dyke Bund Raising works, including submission of drawings for vetting/approval by IIT Madras and incorporation of their observations, etc., complete. Further, carrying out detailed engineering, design and preparation of drawings for Ash Slurry Pipeline modifications/realignment / laying of new pipe lines including structural supports (if any), thrust blocks, crossings, and allied civil works, submission for vetting/approval by Indian Institute of Technology Madras, as detailed in the Technical Specification.

Providing and installing Vibro Stone Compaction piles of 800mm dia , 12.0 m depth at 1.90 m centre to centre spacing in a pattern as shown in the approved cross-section drawing using approved graded aggregates by vibro-replacement method or equivalent approved technique including boring/sinking to required depth, feeding and compacting aggregates in stages to achieve specified diameter and load carrying capacity & conducting load test, complete in all respects as per approved design and as detailed in the technical specification, including cost of all materials, labour, equipment, plant & machinery, leads & lifts, dewatering (if required), quality control tests and any incidental works, etc., complete.

Providing and forming Embankment / Bund Raising by soil - pond ash mixture with clay core section clayey gravel outer cover of 2.0 m thickness on both upstream and downstream faces OR compacted soil with 98% proctor density (cross-section recommended by IIT Madras), including filling of eroded/damaged portions, dressing to required lines, levels and slopes and compacting in 250 mm thick layers (loose thickness) to achieve the specified density as per technical specification. The work shall include watering (wherever required), mechanical compaction using suitable rollers, trimming, slope finishing and carrying out all mandatory Quality Control tests (field density test, moisture content, gradation, etc.) at specified frequency including submission of test reports, complete in all respects as specified in the specification and including cost of all materials, labour, T&P, machinery, leads & lifts and incidental charges, etc., complete.

Providing Internal drainage system including horizontal blankets (downstream & upstream), vertical chimney drain, rocktoe, toe drains, excavation, compaction to maximum relative density, testing etc., complete as detailed in the specification.

Providing complete slope protection works including graded filters (sand + gravel), dry stone pitching (230 mm), turfing, rocktoe masonry, flush pointing, reconstruction of damaged slopes etc.,complette as detailed in the specification.

Providing complete Road works on bund top, including GSB layers (150 mm + 150 mm + 250 mm) with 98% modified Proctor density, MORTH specification, RCC Hume pipes 200 mm dia, precast M20 kerb wall etc., complete as detailed in the specification.

Renovating and raising the existing Decanting Well by 3.0 m height over and above the existing structure, including construction of new decanting wells and connecting the same to the existing system in RCC M30 grade concrete, Epoxy Coated TMT reinforcement bars, complete as per approved structural drawings and technical specifications. The scope shall include providing temporary cofferdam arrangements, dewatering, surface preparation of existing RCC walls, fixing of weld mesh, and applying 50 mm thick cement mortar guniting/ shotcrete to the existing RCC surfaces for strengthening and bonding. The work shall also include supply and laying/fixing of DI (Ductile Iron) pipes, RCC Hume pipes, specials, joints, embedment in concrete, leak-proofing, testing, curing, finishing and all allied civil, structural and piping works including cost of all materials, labour, plant & machinery, staging, centering, shuttering, leads & lifts, testing, quality control and incidental charges, etc., complete in all respect as detailed in the specification.

Providing and erecting Structural Steel Girder Bridge, including fabrication, erection, alignment, bolting/welding and all allied works as per technical specification. The work also includes dismantling of the existing bridge structure, removal of structural members, carrying out barnacle cleaning / marine growth removal from affected structural portions, providing/placing precast RCC slabs for entire deck portion as detailed in the specification including cost of all materials, labour, tools & plants, machinery, leads & lifts, testing and incidental charges, etc., complete.

Supply, fabrication, laying, erection, testing and commissioning of new ash slurry pipeline of required diameter, or dismantling of the existing pipeline and rerouting/re-laying the same as required for NCTPS Stage I, II , III & Ennore SEZ STPP , rectification of recovery water system including civil works (pedestals, foundations, thrust blocks), to facilitate discharge of ash slurry into the ash dyke up to the finished bund level, including all fittings, supports, valves, jointing, cutting, welding, testing, labour, tools and tackles, lead, lift and all incidental charges complete as per specifications and as directed by the Engineer-in-Charge.