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Name of work: - Rehabilitation and Up-gradation of Kondli: Phase I (45.5 MLD), Phase II (113.7 MLD) & Phase III (45.5MLD) Wastewater

Treatment Plants (WWTPs) with effluent standards of BOD -10 mg/l, TSS –10 mg/l or better under YAP (III) (Package K3)

Reply to Pre-bid Queries

Page 1 of 14

S.

No. Volume Page Clause

Subject / Particulars as per Bid

Document Bidder’s Queries Reply

Bidder 1

1) Volume 1 33 Cover Page

ITB 1.1 Bid Data

Sheet

Reference ID No.

BID-YAP-(III) (K3/2017/18)

Identification and number of the

lot(s) (contract(s)) comprising this

ICB are: BID-YAP (III) (K3/2016-

17)

Kindly clarify which is the correct

IFB number as bidders are required to

quote the same in various Forms

given in the tender document

Please read IFB no. as

“BID-YAP-(III)

(K3/2017/18)”

2) Volume 1 37 ITB 22.2 Bid Data

Sheet

The written confirmation of

authorization to sign on behalf of the

Bidder shall consist of: Original

Power of Attorney (legally valid) for

authorised signatory of the Bid.

As per our understanding of the

clause, Original Power of

Attorney(s), specific for the current

project, in favour of authorised

signatories of Joint Venture partners

and a Power of Attorney in favour of

Lead Partner is required against this

criteria. Kindly clarify ?

As per bid document

Bidder 2

3) Volume – 2, Section :

X, Part ‐ 9 List of

Approved makes

744 39 Approved makes of DAF thickener We, TRIVENI are one of the reputed

manufacturers of water treatment

equipments and we have

manufactured, supplied, Installed and

commissioned several DAF thickener

units. A partial list of DAF

installations is enclosed herewith for

your ready reference.

It is worthwhile to mention that our

name is already there for other

Process Equipments namely

As per bid document




Page 2 of 14

S.




Clarifiers, Gravity Thickener, Gas

Mixing etc but it is not there for DAF

Thickener. Therefore, we request you

to incorporate our name in the

approved vendor list for DAF

thickener also.


X, Part ‐ 9 List of

Approved makes

740 List of Approved Makes: Blowers

and Chlorinator

We wish to bring your attention to

the fact that only foreign makes are

listed against crucial major process

equipments for Chlorinator and

Aeration Turbo/Centrifugal Blowers.

We therefore request you to add the

names of some reputed Indian makes

as this is an era of “MAKE IN

INDIA”.

For air blowers, Indian makes like

SWAM, EVEREST can be added as

they also manufacture turbo air

blowers.

For Chlorinators, Indian makes like

Industrial devices, Perfect Chloro,

Capital Control may be considered.

As per bid document

5) Sl. No. 6 of C&A no.

2

2 S. No. 6 Technology Quote: “Though suggested process

details to achieve guaranteed effluent

parameters are mentioned in Part -2,

however process technology is open

and bidders can adopt any proven

ASP/modified ASP technology for

achieving the effluent parameters to

Bidder is free to make

changes in the existing

structure as per

requirement taking into

consideration of space

constraint and available

hydraulic levels from




Page 3 of 14

S.




be guaranteed without any basic

changes in the structures available

for rehabilitation in present WWTPs

on economical life cycle cost basis.

Bidders to furnish the sufficient proof

of at least 60 MLD WWTP on such

proposed technology, running

successfully for minimum for last 5

year”.

Query: We understand/infer from the

phrase “without any basic changes

in the structures” that bidders

cannot offer to propose newly

constructed Aeration tanks for Phase

II and Phase III in order to increase

the effective HRT to achieve desired

parameters of BOD< and TSS< 10.

Please confirm.

Inlet to discharge point


IV, Technical

Proposal

134 Quote: The information request for

in this Technical Schedules should be

filled with clear responses,

information like

‐ “DDE” (During Detailed

Engineering )

‐ , as per manufactures standard ,

‐ “later on detailing” or other similar

meaning works or phrases would

essentially be taken as a non

responsive bid.

As per bid document




Page 4 of 14

S.




Query: We understand that this

stringent condition mentioned of non

responsive bid is applicable for the

Guarantee Schedules only and not for

the technical data sheets wherein a lot

of detailed engineering and

exhaustive information is sought.

You will appreciate that at the

bidding stage it is feasible to provide

only the basic technical details and

we understand that at the bidding

stage documents namely Proposed

Plant Layouts, Process Description,

List of Major Civil Structures, Major

Electro Mechanical Equipments and

Electrical Drive list are needed to be

submitted only.

Please confirm.


X, Part 2

307 TSS removal Clariflocculator is recommended in

the referred clause for TSS removal.

However, we understand that the

bidder is free to propose any other

process for the TSS removal like

tertiary treatment/disc filter/cloth

filer/ /gravity filter etc. Please

Confirm

As per bid document


X, Part 4

413 9 Diffuser Clean Water Performance

(SOTR) Testing

Quote: The Engineer shall have the

right to require the Contractor to

carry out Standard Oxygen

As per bid document




Page 5 of 14

S.




Transfer Rate testing of all the

aeration zones. The water depth in

the tank for the tests shall be 6

meters. During the test the contractor

shall demonstrate the guaranteed

maximum and minimum oxygen

transfer rates (SOTR) at the

guaranteed airflows and pressures.

The contractor shall carry out tests

generally as set out in the American

Society for Civil Engineers “Standard

Measurement for Oxygen Transfer to

clean water” Latest Edition.

Query: The tests mentioned to

measure the oxygen tranfer rate to

water are asked to be as per the

American Socity of Civil Engineers.

This clause favours some particular

Diffuser manufacturers and thus

unnecessarily loading the project cost

loading.

We, therefore, request you to delete

the clause and allow manufacturer’s

certification and data from the

operational installations


X, Part 2

293 &

294

2.10 Type of grit chamber Only Vortex Type Grit Chamber is

envisaged in the bidding documents

while CPHEEO and standard

references like Metcalf Eddy equally

As per bid document




Page 6 of 14

S.




allow Detritor Type and Aerated

Type Grit Chambers also. Also a very

stringent grit removal efficiency of >

95 % for grit greater than150 microns

and > 85% for grit greater than 100

microns is specified in the bidding

documents which is very stringent.

We are enclosing Table 5.18 of

Metcalf Eddy which clearly indicates

a Typical Removal efficiency of

>65% for grit size of 150 microns.

Such stringent condition is favoring

only one foreign make equipment

supplier.

So, we request you to allow Aerated

Type and Detrittor Horizontal Flow

Type grit removal mechanisms in

addition to Vortex Type Grit

Chambers and at the same time relax

the Grit Removal efficiency in

accordance with the standard

reference as enclosed.

Our request should also be

ascertained by the fact that your

tender envisage OPEN

TECHNOLOGY and therefore

restricting grit removal to only

Vortex type would defeat your motto

of OPEN TECHNOLOGY.

10) Volume 2, 702 8.2.1 Sludge Disposal The sludge generated from the As per bid document




Page 7 of 14

S.




Section X,

Part 8

WWTP shall

be disposed of by the contractor to a

proper

landfill site, or other sites as directed

by the

Employer.

Please confirm the following:-

1) Has the landfill site already

identified by DJB?

2) In that case please provide the

distance of Sludge Disposal site from

the STP plant.

This question was raised earlier

during the pre-bid meeting by several

prospective bidders, but was replied

“As per bid document”. This is a

critical issue.

Kindly give descriptive reply.

11) Corrigendum &

Addendum No. 11

4 & 6 S. No. 8 Phosphorus Removal As per your reply, Requirement &

provision of alum dosing is

necessary.

Since desired phosphorus effluent

guarantee can be achieved by BPR

(biological phosphorus removal),

therefore provision of chemical

dosing should not be mandatory for

Chemical dosing is not

compulsory. The bidder

may decide as per his

design




Page 8 of 14

S.




the bidders proposing BPR. Please

confirm.

In the other case if DJB mandatorily

wants provision of alum dosing,

please specify minimum requirement

of alum dosing to bring all the

bidders at par.


X, Part 2

307 Alum & Polymer Dosing and

Clariflocculator

“Alum and polymer dosing shall be

done before/ at the Secondary

Clarifier for Phosphorous and TSS

Removal. Adequate mixing and

flocculation time to be provided.

Clariflocculator is recommended for

mixing and floc formulation”.

Query :

We understand that tender envisage

open technology and bidders are free

to propose any process to achieve

guaranteed desired outlet parameters

and therefore Alum & Polymer

Dosing should not be binding and

mandatory for the bidders and they

can offer any other alternative

process unit instead of secondary

clariflocculator, provided they meet

the desired outlet standards as

stipulated in the tender. Please

confirm.

Further, we understand that the

Refer reply at S. N. 11

above




Page 9 of 14

S.




design criteria specified for new

secondary clarifier in clause no.

2.18.1, page no. 308 is applicable for

conventional clarifiers only and the

design criteria adopted by bidders

may differ in case they offer high rate

/ advanced / HRSCC clarifiers. Please

confirm.

Bidder 3

13) Volume-1B, Section

III A

104 4.2(a) Eligibility & Qualification Criteria The specific experience requirement

is stated as

The Bidder should have successful

experience in the role of prime

contractor for Design, Construction,

Testing & Commissioning of the

conventional activated sludge process

In

At least 1 (One) Wastewater

Treatment Plant (WWTP) of 120

MLD (or)

At least 2 (Two) Waste Water

Treatment plant (WWTP) of 80 MLD

each (or)

At least 3 (Three) Waste Water


each

The above projects should have been

As per bid document




Page 10 of 14

S.




commissioned in last Ten (10) years

as on date of submission of Bids

We would like to draw your kind

attention on qualification Criteria of

similar past tenders of DJB:-

1 STP of Maximum Capacity ranging

from 55% -60% OR

2 STPs of Maximum Capacity from

38% - 40% OR

3 STPs of 27%-30% of the proposed

capacity of the Plant.

As the scope of works include

Rehabilitation & Up-gradation of

Phase I (45.5 MLD), Phase II (113.7

MLD), Phase III (45.5 MLD) the

maximum capacity of a single plant is

113.7 MLD only.

Therefore request you to kindly

consider one plant of capacity 100

MLD

In JV Clause, each partner should at

least have an experience of 60 MLD

using conventional activated sludge

process :-




Page 11 of 14

S.




As the project doesn’t specify any

particular technology, request you to

consider the bidder with PQ on any

aerobic growth process for “At least

one WWTP of 60 MLD” for each

partner in case of a JV

Based on these points, The requested

modifications are as follows,

The Bidder should have successful

experience in the role of prime

contractor for Design, Construction,

Testing & Commissioning of the

conventional activated sludge process

In

At least 1 (One) Wastewater

Treatment Plant (WWTP) of 100

MLD (or)

At least 2 (Two) Waste Water


each (or)

At least 3 (Three) Waste Water


each





Page 12 of 14

S.





as on date of submission of Bids

14) Volume-1B, Section

III A

105 4.2(c) Eligibility & Qualification Criteria The specific experience requirement

is stated as

The Bidder should have experience in

the role of prime contractor for

Rehabilitation or Up-gradation of

clarifiers or aeration unit and

digesters or gas holders for at least

one Wastewater Treatment Plant

(WWTP) of 60 MLD or above

capacity.



as on date of submission of Bid.

Since the rehabilitation can have any

combination of process units, we

request you to consider any of these

components for PQ

Based on this, The requested

modifications are as follows,

The Bidder should have experience in

the role of prime contractor for

Rehabilitation or Up-gradation of

clarifiers or aeration unit or digesters

As per bid document




Page 13 of 14

S.




or gas holders for at least one

Wastewater Treatment Plant

(WWTP) of 60 MLD or above

capacity.



as on date of submission of Bid.


X, Part ‐ 2

298 &

299

2.16 Bio Reactor – Phase II and III As per NIT, for Phase II and III,

existing bioreactor has to be

rehabilitated with IFAS technology.

The sizes of existing bioreactor

provided as ;

Phase II – 90 m x 44 m x 3.5 m

(L.D) – 2 Nos

Phase III – 116 m x 16 m x 3.8 m

(LD) – 2 Nos.

Liquid depth of bioreactor in phase II

and III is 3.5 m and 3.8 m

respectively. Due to lesser liquid

depth, the oxygen transfer efficiency

will be lower and required larger

blower capacity.

Please clarify whether bidder can

demolish the existing bioreactor and

construct a new bioreactor with

increased depth.

Refer reply at S. N. 5

above

16) Volume – 2, Section : 292 2.9 Coarse or Medium and Fine screen As per NIT, for phase I separate As per bid document




Page 14 of 14

S.




X, Part ‐ 2 channel Screens and Grit chamber to be

provided and combined screens and

grit for Phase II & III.

Please clarify, whether screen and

grit chamber can be combined for all

three phases.

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