NTPC LIMITED


PROJECT : Northkaranpura Super Thermal Power Project (3x660 MW)

PACKAGE NAME: ASH DYKE PACKAGE

---------------------------------------------------------------------------------------------------------------------

“Salient Technical Features of the equipment/systems/services covered in IFB No. 40058891 dated 23.06.2016, Bidding Document No. CS-4410-331(R)-9 are mentioned below. These Salient Technical Features are mentioned only to facilitate the prospective bidders to prima-facie understand the requirements under the tender and shall not in any way limit or alter the scope of work and technical features/specification of equipment/ systems/ services covered in the Bidding Documents. Detailed provisions in regard of scope of work and technical features/ specification of equipment/ systems/ services, contained in the Bidding Documents shall be final and binding.”


SALIENT TECHNICAL FEATURES

The proposed ash dyke area is adjacent to the plant boundary. The scheme for ash disposal envisages two storage lagoon with sedimentation basin for disposal of fly ash and a smaller storage lagoons & an over flow lagoon for the disposal of separate bottom ash in the ash disposal areas. The topography of the proposed ash dyke areas is undulating. Ground level is varying from RL 432M to 458M for Ash. The total length of the starter for both the dykes is estimated to be about 8350M. Construction of well type water escape structure with flexible opening is also envisaged for decanting water from storage lagoons to over flow lagoon/sedimentation basin. Decanted water from storage lagoons through RCC well will be collected into over flow lagoon (OFL). Construction of spillways is also envisaged for discharging excess rain water from storage lagoons to OFL/RCC perimeter drain and from OFL to the existing drainage. Scope of work also involves construction of rock toe, toe drain and rip rap for down stream slope protection works of dyke embankment. Impervious lining to bed of bottom ash storage lagoon and OFL with bentonite blended soil is also envisaged under scope of this package. Construction of bituminous inspection road and RCC perimeter drain all around the periphery of the dykes is also under the scope of this package. Scope of this package also include preparation of earthen bed by excavation for nallah diversion.


All construction works shall be carried out based on the drawings which are released by the owner for construction.

The major work involved in this package will be as given below;

  1. Earth work in Embankment Construction = 20,00,000 cum ( with earth excavated from inside ash pond area))

2. Providing Sand filter = 2,70,000 cum

  1. Providing Aggregate filter = 16,000 cum

  2. Providing Rock toe & rip rap = 16,000 cum

  3. Reinforced concrete work = 11,000 cum

  4. Water Bound Macadam = 20,100 cum

  5. Clay bricks = 1,05,00,000 Nos.

  6. Bituminous Courses = 7,700 cum

  7. Non woven Geotextile = 10,000 Sqm


1