Kolkata Environmental Improvement Project (KEIP) is a multi-agency endeavour to arrest environmental degradation and improve the quality of life in Kolkata. Its work is mainly in the outer areas of the city where the sewerage and drainage infrastructure is grossly inadequate and the drainage canals are choked by silt.
KEIP’s objectives are to reduce pollution
by providing affordable access to basic urban services in slums, revamp and up grade the sewerage and drainage system, make solid waste management system efficient,restore the city's drainage canals , and improve outdoor recreation facilities in parks and water bodies. It also has a capacity building component to raise the standards of KMC’s delivery of municipal services.
1813 – IND : Kolkata Environmental Improvement Project
Contract No. and Title
KEIP / NCB / CW25/ 2010-11; Rehabilitation of EKW (South) Canals for Improvement of Sewage Distribution System
Deadline for Bids
20.07.2010, 2.30 P.M
1.
India has received a Loan from the Asian Development Bank (ADB) towards the cost of the Kolkata Environmental Improvement Project and it intends to apply part of the proceeds of this loan to payments under the contract for which this Invitation for Bids is issued.
2.
Irrigation and Waterways Department, Government of West Bengal (The Employer) represented by The Project Manager(Civil), Project Management Unit, KEIP, invites sealed bids from eligible bidders for the Civil Works for Rehabilitation of EKW (South) Canals for Improvement of Sewage Distribution System, and the principal quantities involved in the package, but not limited to, are :
Sl. No.
Description of Items
Unit
Qty
1
Clearing and grubbing of Canal banks. Removal of debris (including floating debris) removal of water hyacinths and disposal to pre-approved location at any distance arranged by the contractor.
Km
14
2
Earthwork in excavation or re-excavation of drainage channels / rivers in all kinds of soil including silt, sand, slush etc, by means of suitable floating type dredger mounted on pontoon etc.
Cum
71327
3
Earthwork in excavation including silt clearance of drainage channel / canals in all sorts of soils including dewatering etc
Cum
43295
4
Earthwork in excavation for structures like toe walls, U-trough, falls, retaining walls and cut-off walls etc. in all types of soil etc
cum
730
5
M-15 grade pre-cast cement concrete block lining
Sqm
456
6
Plain cement concrete (1:3:6 mix)
Cum
42
7
Structural concrete works (M-30)
Cum
255
8
Structural concrete works (M-20)
Cum
39
9
Reinforcement for structural concrete
MT
23
10
Excavation for construction of roadway in all types of soil
Cum
5096
11
Single brick flat soiling (75 mm thickness) with 1st class picked jhama bricks
Sqm
18967
12
Providing and laying 1st class brick on end edging with all leads and lifts.
m
18967
Exact details and specifications are provided in the bidding document.
Bidding procedure shall be Single Stage: Two Envelope procedure under National Competitive Bidding
3. To obtain further information and inspect the bidding documents, bidders should contact
Project Manager (Civil),
Project Management Unit
Kolkata Environmental Improvement Project,
Irrigation and Waterways Department,
Government of West Bengal
206, A.J.C.Bose Road, 2nd Floor,
Kolkata 700 017, West Bengal, India
Ph : +91(33)22834490/4491,
Fax : +91(33)22834489,
4.To purchase the bidding documents in English, eligible bidders should :
write to address above requesting for the bidding documents for Rehabilitation of EKW (South) Canals for Improvement of Sewage Distribution System under the above package.
pay a non-refundable fee of Rs. 5000.00 by way of demand draft favouring Senior Engineer, attached to the Project Director, PMU, KEIP, I & W Department, Govt. of West Bengal payable at Kolkata. The document will be sent by courier for an additional fee of Rs. 500.00 within India.
5.Bidders should satisfy the following qualification requirement and must demonstrate that :
Networth is positive
Average annual construction turnover over the past three years should be atleast Rs. 126,270,000.00
The Bidder must demonstrate access to, or availability of, financial resources such as liquid assets, unencumbered real assets, lines of credit, and other financial means, other than any contractual advance payments to meet the overall cash flow requirement of atleast Rs. 15,780,000.00
Experience in construction contracts in the role of Contractor/Joint Venture Partner/Sub-Contractor for a minimum of 5 Years.
Construction Experience in Contracts of Similar Size and Nature :
Participation as Contractor/Joint Venture Partner/Sub-contractor in at least two works within the last 10 years each with a value of not less than Rs. 55,240,000.00 that have been successfully or are substantially (more than 80%) completed.
The following work experience shall be considered for qualification purpose :
Either 2 no of works of construction / rehabilitation of canal / drainage channel / embankment / dam / dyke including structures
Or
1 no similar work as stated above in (a) and 1 no work of any Civil Engineering construction wor
Apart from above 2 similar works, experience in structural concrete works of minimum 85 cubic meter, either in the above 2 works or any other works in aggregate is a pre-requisite.
6.
Work planning, method statement including methodology proposed by the bidder for execution of the work as detailed in section 9 of bid document, shall be a key element for technical evaluation of the bid.
7.
Pre bid meeting will be held in the office of the Project Director, KEIP at 12 Noon (IST) on 30.06.2010 Bidders are encouraged to participate in this meeting and it is desirable that bid document is studied thoroughly before this meeting. Project Director PMU (I & WD) KEIP will arrange site inspection on 29.06.2010.. Bidders are advised to send their representative(s) to KEIP office at the above address at 11.00 A.M. (IST) and proceed to site with PMU Engineers
8.
Deliver your bid :
• To the address given above
• On or before the deadline 20.07.2010 at 2.30 P.M (IST)
• Together with bid security of Rs 790,000.00 favouring Senior Engineer attached to the Project Director, Project Management Unit, Kolkata Environmental Improvement Project, Irrigation & Waterways Department, Government of West Bengal.
• Technical Bids will be opened at 3.00 P.M (IST) on 20.07.2010 in the presence of bidders authorized representatives who choose to attend at the address stated above.
Late Bids shall be rejected.
Financial Bids will be opened in the presence of the qualified Bidders’ representatives who choose to attend on a date and time to be advised following evaluation of the Technical Proposals at the address stated above.
BACKGROUND INFORMATION
Introduction
East Kolkata Wetland (EKW) and Waste Cycling Region?
The East Kolkata Wetland and Waste Cycling Region covers 29 full mouzas and 3 part mouzas located within four police stations, viz. Bidhannagar (South), Bhangor, Tiljala and Sonarpur. The area was declared to be a conservation area by ruling of the Hon’ble Calcutta High Court in 1992. The area covers 12492 Ha.
The wetland extends almost equally on both sides of the Dry Weather Flow (DWF) Channel which discharges into Kulti Gong., the waste water outfall of Kolkata about 28 km further east of Bantala. The wetlands lie approximate between 22º25’ to 22º40’ North latitude and 88º20’ to 88º35’ East longitude. This tropical location makes the region suitable for using solar radiation to improve waste water quality.
The low lying land at the periphery of the city became gradually a dumping ground for solid waste. In some part of this land over the garbage there are cultivations for growing vegetables. By 1928, when the Bidyadhari River became practically dead, cessation of tidal flow converted the entire area into a vast swamp. The practice of growing fish in the sewage fed ponds started thereafter.
The main DWF and the storm water flow (SWF) Channels were excavated in late thirties of twentieth century. The waste water flow had been utilised in the sewage fed fisheries / bherries as nutrients for pisciculture. The wetland purifies the sewage water through natural process of oxidation, radiation and biological breaking down of the organic waste.
The practice of sewage-fed fish farming east of Kolkata developed over the past hundred years. It is a well-planned and laid-out system, where originally:
• The DWF is separated from SWF, jointly collected in the combined sewer networks of the city, at the main pumping stations in KMC.
• Dedicated DWF channels conveyed the raw sewage to the fisheries.
• A network of sewage-feed canals distributed the sewage over the fishponds.
• A network of drainage ditches and canals conveyed the effluent from the fish ponds towards the Kulti River in the east.
To a large extent the present DWF distribution system is still the same but it has several hydraulic shortcomings.
(a)
Much of the DWF finds its way into the main storm drainage (SWF) canals, both through direct outfalls of the sewer networks into these canals and at the main pumping stations.
(b)
The main DWF feed canal coming from the city discharges into the Central Lake Canal, a major SWF tributary, where it mixes with fresh water. The discharge results in serious pollution of this fresh water body.
(c)
Most of the fishery-feed channels have their intake from the Central Lake Canal, resulting in weak feed material for fish cultivation.
(d)
To be able to feed the fishery intakes along the Central Lake Canal, the Bantala regulator, situated at the tail-end of the canal, is kept closed to increase the water level in the canal. This creates a major conflict with flood control in the upstream city area which requires opening of the regulator gates.
(e)
There are several siphons in the DWF distribution system that are in a poor state of repair and suspect of having blockages. This hampers efficient distribution of sewage.
(f)
The main DWF channels between the city and the fisheries are suspected being silted, reducing their flow capacity and resulting in DWF spills into SWF canals as well as less feed material reaching the fish ponds.
(g)
Many fishery-feed channels are silted up, disturbing the distribution of sewage.
(h)
Fish ponds are reported to silt up rather fast, requiring frequent desilting by the fish farmers. There is an apprehension that gradually the level of the ponds are getting higher, affecting wastewater distribution.
The shortcomings listed above are proposed to be rectified by following measures :
(a)
One of the main objectives of KEIP is to stop DWF flowing into SWF canals and works on the S&D systems in Borough VII and XII are directed to that. Rectification of separate DWF and SWF pumping at KMC’s main pumping stations ranks high on the priority list of the city’s S&D Master Plan (January 2008).
(b)
To stop DWF discharging into and polluting the Central Lake Canal, a siphon needs to be constructed through which DWF can cross the canal independently. This is a major rectification and improvement of the existing DWF distribution system.
(c)
There is an old, presently defunct, DWF channel running parallel to the Central Lake Canal. This channel needs to be revived and shall have its intake downstream of the new siphon mentioned under point (b) above. The intakes for the fishery-feed channels are to be taken from the revived channel and the present intakes from Central Lake Canal shall be closed.
(d)
Also, the intake of the main DWF feed channel that runs from Bantala towards the east, shall be reconfigured: the present intake at the Bantala regulator shall be abandoned and a new intake shall also be made downstream of the new siphon. After construction and commissioning of siphon, the gates of Bantala regulator will be redundant and the same are to be dismantled with the approval of I & W Department.
(e)
The existing siphons in the DWF distribution system require a major overhaul, including cleaning, refitting of control gates and construction of screens to halt floating matter entering the siphons.
(f)
The main DWF channels between the city and the fisheries require desilting.
The packages include the following works :
1)
Desilting of the following Fish Feed Channel :
i) Lalkuthi Khal
ii) TP Bajbarantala Link Canal
iii) Nodor Khal
iv) Kharki Belekhali Bajbarantala Khal
v) Deara Khal
vi) Bidyadhari Extension Khal
vii) Part of Main Fish Feed Canal
viii) Kanchagheri Jhawkhali Khal
2)
Construction of a new syphon in the Deara khal under Kharki Belekhali Bajbarantala Khal at the Junction of Deara Khal & Kharki Belekhali Bajbarantala Khal.
3)
Construction of Inlet Structure at the entry point of each secondary Fish Feed Canal
4)
Construction of outfall control structure at the outfall point of each canal to stop the entry of storm water from outfall canal as well as sewage water from fish feed canal to outfall drainage channel.
5)
Clearing and renovation (including providing gates) of the existing DWF system under the SWF canal, at the tail end of the main DWF feed channel, feeding the Southern fish ponds.
