Telengana STPP,
ASH DYKE PACKAGE
“Salient Technical Features of the equipment/systems/services covered in IFB No.0040061662 are mentioned below. These Salient Technical Features are mentioned only to facilitate the prospective bidders to
BRIEF SCOPE OF WORK:
The scope of works involves construction of two storage lagoons for Bottom ash and one storage lagoon for Fly ash & a common over flow lagoon for the collection of decanted water from lagoons. Construction of well type water escape structure with flexible opening is also envisaged for decanting water from storage lagoons to over flow lagoon. 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 works also include construction of protective bund between dyke embankment and reservoir. Scope of this package also include the construction of WBM two lane access road from main State Highway to proposed ash dyke area.
The detailed scope and description of work covered under this package has been specified in relevant clauses of
SALIENT TECHNICAL FEATURES:
The scope of works involves construction of two storage lagoons for Bottom ash and one storage lagoon for Fly ash & a common over flow lagoon for the collection of decanted water from lagoons. Construction of well type water escape structure with flexible opening is also envisaged for decanting water from storage lagoons to over flow lagoon. 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 works also include construction of protective bund between dyke embankment and reservoir.
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 storage lagoons 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 the construction of WBM two lane access road from main State Highway to proposed ash dyke area.
All construction works shall be carried out based on the drawings which are released by the owner for construction.
1)Formation of dyke ( ash borrowed from existing ash pond area) – 5,50,000 cum
2)Formation of dyke ( earth available from borrow area arranged by contractor ) = 16.35 Lcum
3)Formation of protective bund/access road ( mine over burden soil available from SCCL) = 3.0 Lcum
4)Bottom ash filter = 3.10 Lcum
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5)Aggregate Filter = 50,000 Cum
6)Stone/coal boulder works = 50,000cum
7)Brick Works = 22,100 cum
8)(WBM) (Sub base/base) = 46,800 cum
9)Bituminous Macadam = 7000 cum
10)Bituminous Concrete = 2700 cum
11)RCC = 13,000 cum
DETAILED SCOPE OF WORK.
The scope and description of work covered under this package has been specified in relevant clause of Technical specifications. However, the Contractor may note the brief description of works of this package as below:
The proposed ash dyke area is adjacent to the upstream of balancing reservoir of existing RSTPS. The scheme for ash disposal envisages one storage lagoon for disposal of fly ash and two storage lagoons for bottom ash disposal & an over flow lagoon (common for all) for collecting the decanted water from lagoons. The topography of the proposed ash dyke areas is undulating. Ground level is varying from RL 160M to 180M. As the ash dyke is closed to existing balancing reservoir, to protect the ash dyke embankment from reservoir water it is proposed to construct one protective bund with impervious core. The total length of the starter dyke including protective bund for both the dykes is estimated to be about 11150M. Construction of well type water escape structure with flexible opening is also envisaged for decanting water from storage lagoons to over flow lagoon. 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 storage lagoons 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 the construction of WBM two lane access road from main State Highway to proposed ash dyke area.
All construction works shall be carried out based on the drawings which are released by the owner for construction.
The Work involved is mainly related, but not limited, to the following:
i.Preparation of work areas / clearing site / jungle clearance.
ii.Ground stripping.
iii.Excavation.
iv.Foundation preparation.
v.Formation of the dyke/protective bund section as per drawings with borrow earth, pond ash & Mine over burden soil.
vi.Formation of bottom ash filter chimney, blanket and filter as per drawings.
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vii.Construction of dyke rock toe, rip rap (with geotextile) and filters for forming toe drain.
viii.Dyke outer slope protection with turfing.
ix.Dyke inner slope protection with dry brick packing confined within brick masonry panel walls and with rip rap.
x.Construction of dyke slope drains/ stair steps.
xi.Construction of RCC works for water escape structures & Spillways.
xii.Laying and embedding RCC/MS pipes.
xiii.Earthen channel near toe drain for guiding excess rainwater - runoff.
xiv.Bituminous Road works (over dyke top & Inspection road along periphery of dyke).
xv.Two lane WBM access road from main highway
xvi.Installation of instruments for monitoring purpose.
xvii.Diversion and training of existing nallah.
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