697DCK-18-R-00406 Amend 0002.pdf

PDF 477 KB Posted Oct 19, 2018

Attached to: AMENDMENT 0003: MAJOR MECHANICAL UPGRADES PROJECT AT FAA'S DENVER ARTCC FACILITY IN LONGMONT, CO
Solicitation number: 697DCK-18-R-00406
Issued by: Department of Transportation Federal Aviation Administration Northwest Mountain Region

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Other files

File	Type	Posted
Question 30 - RMD-502-40479-A07.pdf	PDF	Oct 19, 2018
697DCK-18-R-00406 Amend 0003.pdf	PDF	Oct 19, 2018
Attachment 2 - Past Performance Survey.docx	DOCX document	Oct 19, 2018
697DCK-18-R-00406.pdf	PDF	Oct 19, 2018
697DCK-18-R-00406 Amend 0001.pdf	PDF	Oct 19, 2018
Question 29 - List of Furniture.pdf	PDF	Oct 19, 2018
Question 30 - RMD-502-40479-A05.pdf	PDF	Oct 19, 2018
Attachment 1a - FINAL 100% Drawings 07-12-18.pdf	PDF	Oct 19, 2018
Question 18 and 19 - ZDV-1401893-M901.pdf	PDF	Oct 19, 2018
Question 61 - 23 21 23 Hydronic Pumps Amendment 10.10.pdf	PDF	Oct 19, 2018
Attachment 1 - Final 100% Specifications 7-31-2018.pdf	PDF	Oct 19, 2018
Question 30 - RMD-502-40479-A06.pdf	PDF	Oct 19, 2018
Question 92 - FAA Order 6000.50E.pdf	PDF	Oct 19, 2018
Attachment 4 - SF-1413 Subcontractor.pdf	PDF	Oct 19, 2018
Question 52, 72, and 74 - FAA-STD-019f.pdf	PDF	Oct 19, 2018
Attachment 3 - DB WD CO180027 dated 8-3-2018.pdf	PDF	Oct 19, 2018
Question 30 - RMD-502-40479-A07.pdf	PDF	Oct 12, 2018
Attachment 1a - FINAL 100% Drawings 07-12-18.pdf	PDF	Oct 12, 2018
Question 52, 72, and 74 - FAA-STD-019f.pdf	PDF	Oct 12, 2018
Question 30 - RMD-502-40479-A06.pdf	PDF	Oct 12, 2018
Question 61 - 23 21 23 Hydronic Pumps Amendment 10.10.pdf	PDF	Oct 12, 2018
Question 92 - FAA Order 6000.50E.pdf	PDF	Oct 12, 2018
Attachment 4 - SF-1413 Subcontractor.pdf	PDF	Oct 12, 2018
697DCK-18-R-00406 Amend 0002.pdf	PDF	Oct 12, 2018
Question 18 and 19 - ZDV-1401893-M901.pdf	PDF	Oct 12, 2018
Question 30 - RMD-502-40479-A05.pdf	PDF	Oct 12, 2018
697DCK-18-R-00406.pdf	PDF	Oct 12, 2018
Attachment 2 - Past Performance Survey.docx	DOCX document	Oct 12, 2018
Attachment 1 - Final 100% Specifications 7-31-2018.pdf	PDF	Oct 12, 2018
697DCK-18-R-00406 Amend 0001.pdf	PDF	Oct 12, 2018
Attachment 3 - DB WD CO180027 dated 8-3-2018.pdf	PDF	Oct 12, 2018
Question 29 - List of Furniture.pdf	PDF	Oct 12, 2018
Attachment 1 - Final 100% Specifications 7-31-2018.pdf	PDF	Oct 10, 2018
Attachment 1a - FINAL 100% Drawings 07-12-18.pdf	PDF	Oct 10, 2018
697DCK-18-R-00406.pdf	PDF	Oct 10, 2018
Attachment 4 - SF-1413 Subcontractor.pdf	PDF	Oct 10, 2018
Attachment 3 - DB WD CO180027 dated 8-3-2018.pdf	PDF	Oct 10, 2018
Attachment 2 - Past Performance Survey.docx	DOCX document	Oct 10, 2018
697DCK-18-R-00406 Amend 0001.pdf	PDF	Oct 10, 2018
697DCK-18-R-00406.pdf	PDF	Aug 14, 2018
Attachment 4 - SF-1413 Subcontractor.pdf	PDF	Aug 14, 2018
Attachment 2 - Past Performance Survey.docx	DOCX document	Aug 14, 2018
Attachment 1a - FINAL 100% Drawings 07-12-18.pdf	PDF	Aug 14, 2018
Attachment 1 - Final 100% Specifications 7-31-2018.pdf	PDF	Aug 14, 2018
Attachment 3 - DB WD CO180027 dated 8-3-2018.pdf	PDF	Aug 14, 2018
Attachment 3 - DB WD CO180027 dated 8-3-2018.pdf	PDF	Aug 9, 2018
Attachment 1a - FINAL 100% Drawings 07-12-18.pdf	PDF	Aug 9, 2018
Attachment 1 - Final 100% Specifications 7-31-2018.pdf	PDF	Aug 9, 2018
Attachment 4 - SF-1413 Subcontractor.pdf	PDF	Aug 9, 2018
697DCK-18-R-00406.pdf	PDF	Aug 9, 2018

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697DCK‐18‐R‐00406

Denver Major Mechanical Project

Questions & Answers

Question:

Drawing

S102

Detail

indicates

the

scale

½”

–

1’0”

does

the

scale

the

drawing,

but

this

does

not

coincide

with

the

dimensions

the

plans.

Which

correct?

Answer: Drawing was incorrectly labeled and should read ¼” = 1’‐0”

2) Question: Will panels TPS‐1 and TPS‐2 be a part of the temporary chiller package or part of the electrical contractor’s gear?

Answer: TPS‐1 and TPS‐2 are not part of the temporary chiller package. Contractor is to provide panels TPS‐1 and TPS‐2.

Deduct

Option

per

Specification

Section

011000

Part

1.1.10.A

calls

for

underground

12”

pipe

tested.

the

deduct

not

selected:

Question:

What

the

extent

the

piping

removed?

the

piping

under

the

existing

pump

room

floor,

this

will

also

include

floor

removal

the

pump

house.

Correct?

Answer: If the deduct is not selected, all the piping from the chillers to the cooling towers will be replaced.

Question:

What

about

the

6”

CTS

and

CTR

that

exits

the

building

the

south?

what

extent

will

this

piping

need

replaced?

Answer: This piping will not be replaced.

Question:

Electrical

Drawing

E104

sheet

notes

indicate

underground

circuit

and

wiring

remain.

This

conduit

will

removed

the

floor

removed

replace

the

underground

12”

pipe.

How

should

figure

this

work?

Answer: Replacement of the 12” pipe will stop at the foundation. The floor will not be removed.

Question:

Drawing

M104

and

M204

talk

about

the

salvage

and

installation

new

screens.

The

drawings

appear

indicate

grating

over

the

sumps

but

there

currently

exists

wood

planks

and

there

are

notes

suggesting

their

replacement.

the

intent

the

project

re‐use

these

planks

over

the

existing

sumps?

Answer:

The

screens

noted

sheets

M104

and

M204

are

the

vertical

trash/filter

screens

located

within

the

sump.

New

screens

are

fabricated

match

the

existing

ones.

The

cover

panels

are

part

the

system

covering

the

flume

(trough)

and

noted

Architectural

sheet

A202.

See

also

answer

Question

for

additional

detail.

Question:

The

replacement

the

existing

chilled

water

valves

will

require

system

shut

down

accomplish

this

work.

What

the

extent

the

time

that

will

available

for

the

system

down

make

these

transitions?

Answer:

System

shutdowns

are

not

option.

Plant

must

remain

operational

24/7,

with

redundancy.

All

branches

for

each

the

chiller

and

pumps

need

new

isolation

valves.

During

temporary

chiller

operation,

the

CWR

header

piping

for

the

chiller

and

discharge

header

for

the

pumps

will

dry,

the

isolation

valves

can

easily

replaced

during

that

time.

The

chilled

water

supply

header

off

the

chiller

and

the

chiller

water

header

the

suction

side

the

pumps

will

always

remain

active.

This

line

cannot

disabled.

Due

not

being

able

isolate

flow

and

the

valves’

proximity

their

respective

headers

(no

room

for

hot

tap/stopple),

these

eight

(8)

valves

will

need

abandoned

place

and

new

isolation

valves

installed

downstream

each

branch,

with

about

2’

space

between

old

and

new

valves.

This

will

include

the

four

(4)

valves

per

chiller)

the

CWS

lines

for

each

chiller

and

the

four

(4)

valves

per

pump)

for

each

suction

end

the

pumps.

Question:

Drawing

M203

shows

the

installation

6”

bypass

installed

ESU

SSC

Office

B113A.

not

believe

went

into

that

room

during

the

site

visit.

there

open

ceiling

this

area

similar

ESU

SSC

Break

Room

B113

with

dropped

ceiling?

Answer: ESU SSC Office B113A has a dropped ceiling similar to ESU SSC Break Room B113. Room B113A is to have a dropped ceiling.

Question:

Drawing

A201

Notes

call

out

for

the

room

painted.

Note

indicates

the

floors

should

painted

Rooms

B115,

B116,

and

B117.

Notes

only

apply

the

Chiller

Room

B115?

Answer:

Notes

and

only

apply

the

Chiller

Room

B115.

Floors

are

repainted

chiller

room,

boiler

room,

and

vestibule/ramp.

Note

does

not

indicate

floor

painting

Boiler

Room

B116

and

vestibule/ramp

B118.

Refer

Room

Finish

Schedule,

Drawing

A801

for

floor

finishes

chiller

room,

boiler

room

and

vestibule/ramp.

Question:

Where

the

Heat

Exchanger

located

and

scheduled

described

Specification

Section

011000

Part

(1.4)(A)(1)(d)(iv)?

The

description

provide

heat

exchanger

the

pump

house,

but

there

only

one

heat

exchanger

scheduled

and

the

chiller

room.

I’m

not

sure

what

this

referencing

because

don’t

see

one

the

pump

house.

Answer:

Heat

Exchanger

the

chiller

room,

not

pump

house.

Remove

Section

011000

Part

(1.4)(A)(1)(d)(iv)

verbiage

“new

flat

plat

heat

exchanger

(new

free‐cooling

method)”

from

specifications.

Question:

Specification

Section

011000

Part

(1.5)(A)(2)

indicates

should

contact

Johnson

Controls

for

work

the

legacy

DDC

Control

System

however

when

contacted

the

Fort

Collins

office

for

Johnson

Controls,

who

originally

had

service

agreement

the

chillers,

they

indicated

they

had

not

performed

work

the

facility

since

2014.

Who

currently

responsible

for

the

DDC

control

system

for

the

facility?

Answer:

Schneider

Electric

the

DDC

control

provider.

Refer

Section

–

Instrumentation

and

Controls

for

HVAC

Part

1.1(D)(10)

for

contact

information.

10)

Question:

What

meant

the

reference

Spec

Section

011000

Part

(1.4)(A)(1)(c)(vii)

“Provide,

install,

and

maintain

temporary

cooling

tower

units

and

other

associated

equipment

needed,

coordination

with

FAA

facility

personnel”?

The

temporary

chillers

provided

are

air‐cooled.

there

requirement

have

temporary

towers

for

the

existing

equipment?

Answer: No temporary cooling towers required, just chillers. Error in specification wording.

11)

What

meant

the

reference

Spec

Section

011000

Part

(a)(1)(c)(iii)

“Redoing

the

trough

guard

outside

and

inside

the

pump

house”

and

Part

(1.4)(A)(a)(d)(ii)

“New

trough

guard

that

will

seal

better

than

existing”

regarding

redoing

the

trough

guards?

Answer:

There

concrete

trough

under

the

cooling

towers

that

returns

water

from

the

towers

the

sump

for

re‐use.

This

trough

and

the

sump

have

covers

them

keep

debris

out

and

keep

people

from

falling

in.

They

are

also

used

control

free

evaporation.

This

what

refer

the

“guard”.

They

are

currently

made

wood

and

are

subject

rot.

The

covers

are

replaced

with

material

that

robust

than

wood.

far

know,

commercial

product

specifically

for

this

purpose

exists.

Fiberglass

polypropylene

“planks”

sheet

stock

might

able

custom

cut

fit

the

openings.

Or,

the

contractor

free

offer

potential

solution

this

problem

based

their

(or

their

sub’s)

past

experience.

12)

Question:

What

meant

the

Spec

Section

011000

Part

(1.4)(A)(1)(e)(xiv)

“convert

as‐built

shop

drawings

FAA

standard

baseline

drawings”?

Answer:

Refer

Spec.

Section

013100‐1.8.

Using

FAA

provided

digital

data

files/drawings;

the

Contractor

will

incorporate/convert

their

approved

as‐built/redline

drawing

information

final

digital

as‐built

CAD

drawings

and

submit

the

FAA.

13) Question: Please provide contact information for the fire alarm vendor for this facility.

Answer: Contractor may use any qualified, certified fire detection and suppression subcontractor for this purpose.

14) Question: Please provide contact information for the access control subcontractor for this facility.

Answer: Refer to Section 23 09 00 – Instrumentation and Controls for HVAC Part 1, 1.1(D)(10) for contact information.

15)

Question:

Please

provide

contact

information

for

Schneider

Electric

get

their

distribution

list

for

the

DDC

pricing.

The

contact

information

the

spec

book

does

not

appear

current.

Answer: Refer to Section 23 09 00 – Instrumentation and Controls for HVAC Part 1, 1.1(D)(10) for contact information.

16)

Question:

there

environmental

report

available

that

would

show

approximate

quantities

help

abatement

vendors

with

their

scope

work?

Answer: The whole EOF area will need to be abated, approximately 1,400 SF. See Note 5 on drawing A111.

17) Question: Can abatement work be done during normal hours?

Answer:

Yes,

the

extent

which

would

depend

upon

methods,

procedures,

activity

durations,

etc.,

identified

the

contractor

the

required

asbestos

abatement

plan

that

subject

approval.

18)

Question:

Underground

piping

replacement

from

the

towers

called

out

deductive

alternate

the

specifications.

not

see

listed

the

drawings

shown

the

drawings.

Please

provide

plans

for

this

scope.

Answer: See attachment “Question 18 and 19 ‐ ZDV‐1401893‐M901”.

19) Question: Please identify the location and limits of the pipe testing area.

Answer: See attachment “Question 18 and 19 ‐ ZDV‐1401893‐M901”.

20) Question: Will the pipe testing agency be hired by the FAA direct?

Answer: The Contractor will hire the testing agency.

21) Question: Please confirm whether any arc flash studies are required for this project.

Answer: Yes all new panelboards will require Arc‐Flash labeling.

22) Question: Will the FAA remove all furniture, equipment, etc, from the EOF area?

Answer:

No,

contractor

required

move

all

furniture,

equipment,

etc.,

from

the

EOF

area.

See

answer

Question

for

additional

details.

23) Question: Does the temporary cooling piping, conduits, etc., need to be seismically restrained?

Answer: Yes.

24) Question: Does all plastic covering electronic equipment need to be static resistant?

Answer: Yes, all plastic covering electronic equipment needs to be static resistant and breathable.

25) Question: Is there any specification or specific acoustical wall panel called out in the spec? We did not see any.

Answer:

Spec.

Section

098433‐2.1.A

identifies

basis

for

design.

Refer

Drawing

A801

Room

Finish

Schedule

and

Interior

Color

Scheme

Schedule

for

specific

product

listed.

26)

Question:

what

extent

all

penetrations

need

fire

proofing

the

chiller

room?

all

existing

penetrations

need

done

redone?

According

the

note

sheet

A001

only

need

new

penetrations,

correct?

Answer:

Only

new

penetrations

and/or

existing

penetrations

affected

and

rendered

non‐compliant

activities

performed

under

the

scope

work

are

required,

per

Drawing

A001,

firestopped

reworked

for

compliance.

Chiller

Room

exception.

27)

Question:

A022

–

This

note

indicates

there

mold

behind

the

acoustical

panels.

How

much

mold

present

can

quantify

how

much

work

needs

done?

Also,

will

these

acoustical

panels

need

replaced

they

are

coated

mold?

The

note

sheet

A112

only

indicates

replace

the

red

and

orange

acoustical

panels.

Are

there

any

visual

references

reflecting

how

far

the

mold

extends

which

color

panels

are

this

location?

Please

provide

clarify.

Answer:

Estimated

square

footage

mold

follows:

HOST

Mechanical

Room

B119

approximately

200

behind

existing

light

brown

colored

panels.

Remove,

clean

mold

and

reinstall

light

brown

panels.

HOST

Computer

Room

B134

approximately

mold

behind

orange

panels

demolished.

Refer

Drawings

A701

and

A801

they

apply

elevations

and

room

finishes.

If,

during

the

project

work,

additional

mold

discovered

beyond

these

estimated

SFs,

change

order

will

appropriate.

28)

Question:

A022

–

Note

calls

for

the

contractor

“Test

and

abate

mold”.

can

not

price

this

not

know

how

far

extends.

Please

advise.

Answer: See Question 27 answer.

29)

Question:

–

Note

indicates

remove

all

coating

the

floors

(vestibule

chiller

room

and

boiler

room)

concrete.

The

general

contractor

responsible

move

all

furniture

and

equipment

within

the

room

and

then

replace

after

the

new

floor

coatings

have

been

installed.

How

much

furniture

and

equipment

needs

removed

and

reinstalled.

Please

provide

photos.

Answer:

See

Attachment

“Question

–

List

furniture”

for

estimate

items

required

moved

the

contractor.

The

items

will

moved

adjacent

rooms

and

will

not

require

going

down

stairs

significant

distances.

30)

Question:

per

drawing

A131

‐

Note

(as‐built

drawings

the

NEOF

area

available

upon

request).

Please

provide

the

as‐built

drawings.

Answer:

See

as‐built

drawing

Attachments

“Question

–

RMD‐502‐40449‐A05,

‐A06,

and

‐A07).

FAA

does

not

consider

them

essential

for

bidding

purposes.

Price

your

bid

(offer)

based

drawings

provided

original

solicitation.

31) Question: A132 – Does a HEPA vacuum need to be used to vacuum the acoustical ceiling before it is demolished?

Answer: Yes.

32)

Question:

A201

–

Note

indicates

firestop

existing

and

new

penetrations

fire

rated

barriers.

can

not

determine

how

many

how

large

any

existing

penetrations

are,

request

allowance

determined

for

this

work

and

indicated

the

response

the

questions.

How

much

should

this

allowance

be?

Answer:

allowance

will

allowed.

Only

new

penetrations

and/or

existing

penetrations

affected

and

rendered

non‐

compliant

activities

performed

under

the

scope

work

are

required

firestopped

reworked

for

compliance.

Chiller

Room

and

vestibule

are

exception.

33) Question: A201 – Note 6 Is this note for just the chiller room? Should the boiler room be done also?

Answer:

Note

applies

only

the

chiller

room.

Chiller

room

B115

the

only

room

have

walls

painted.

Boiler

room

B116

and

vestibule

will

not

have

wall

patching.

34) Question: A211 – Note 3 Please confirm what the construction of the existing wall is? Metal stud & drywall, masonry?

Answer: Existing wall is metal stud and 5/8” fire rated drywall each side.

35) Question: A211 – Note 10 Please confirm what this cover plate is and what it will be. Steel?

Answer: Existing cover plate is steel. Coordinate replacement with floor finish requirements in accordance with Note 10.

36)

Question:

A201

–

Note

Please

provide

photo

the

leak.

What

the

cause

the

leak

and

how

large

can

determine

what

needs

done

correct

it?

Answer:

Photos

below

show

exterior

and

interior

view

leak

Boiler

Room

south

wall.

Water

wicks

under

the

curb

for

its

full

length.

Since

the

pre‐bid

meeting

August

there

has

not

been

nor

will

there

significant

change

the

conditions.

Exterior view looking down

Exterior view looking West

Exterior view looking East

Interior view

37)

Question:

A212

Note

indicates

inspect

existing

fire

stopping

and

repair

any

that

fail.

have

way

price

this

item

not

know

what

will

not

fail.

Please

provide

allowance

for

this

item.

Answer:

allowance.

The

FAA

unaware

any

failing

fire

stoppings.

Price

your

bid

(offer)

new

penetrations

only.

Any

failed

fire

stopping(s)

discovered

during

the

project

work

will

negotiated

change

order.

38) Question: A212 Note 7 is this stair and handrail system part of the access floor system or a structural steel stair system?

Answer: The stair and handrail system is to be part of the raised floor system.

39)

Question:

A212

Note

please

verify

what

work

needs

done.

asking

for

inspection

the

columns

and

refinished

necessary.

can

not

quantify

this

until

the

inspection

has

been

done.

Answer:

With

the

exception

one

(1)

side

one

column

which

cable

tray

present,

resurfacing

each

side

all

six

(6)

columns

required.

40) Question: A212 Note 14 What type of fire extinguisher?

Answer: Dry chemical Type A‐B‐C.

41)

Question:

A212

Note

This

note

indicates

block

the

ceiling

louvers

that

are

still

working.

this

correct?

How

many

are

there?

How

large

are

they?

Are

these

shown

the

Mechanical

drawings?

Answer: There is only one louver. It is verified that it was blocked off in January 2015. Remove from scope of work.

42)

Question:

Plans

indicate

remove

and

replace

acoustical

wall

panels

that

are

red

and

orange.

the

plans

are

not

color

can

you

indicate

which

panels

are

red

and

orange

can

quantify

how

much

gets

removed

and

needs

replaced?

Answer:

Elevations

sheet

A701

(note

show

the

extent

the

red

and

orange

panels.

Refer

Drawing

A801

“Door

and

Finish

Schedules”.

43)

Question:

A301,

where

the

new

addition

the

building

being

added?

There

appears

utilities

running

through

that

space.

Are

required

relocate

these

utilities?

are

build

top

them?

will

this

handled

the

government?

Will

the

grounding

counter

pose

the

way?

Answer:

Utilities,

including

existing

counterpoise

run

underground

through

the

new

building

footprint.

Yes,

the

Contractor

responsible

perform

utility

locates

and

coordinate

with

the

FAA.

The

FAA

will

provide

as‐built

information

the

Contractor

the

best

our

knowledge

and

available

information

prior

construction.

However,

the

Contractor

remains

responsible

for

the

location

and

protection

underground

utilities.

44) Question: A301 Who is the pre engineer building Manufacturer of the existing building?

Answer: Unknown. No manufacturer’s label is visible on or in the building.

45) Question: A701‐ requires to clean all acoustic panels. What will be the preferred method?

Answer: Dry extraction. Exact method is to be determined by the Contractor, subject to FAA approval.

46)

Question:

M211

and

M212

‐

will

new

tiles,

stringers,

and

pedestals

need

provided

for

the

floor

altering

will

the

FAA

have

attic

stock

that

can

used?

there

existing

rating

the

floor?

Answer:

The

Contractor

not

required

provide

new

tiles;

FAA

has

enough

stock.

The

Contractor

will

required

fill

around

affected

area

with

existing

tiles

supplied

FAA.

The

Contractor

will

need

provide

two

(2)

pedestals,

two

(2)

pedestal

heads,

and

one

(1)

stinger

(manufacturer

Tate

and

product

name

Concor).

47) Question: E214 ‐ is there a requirement to paint conduits and ducts in this space?

Answer: If the reference is to the HOST Mechanical Room B119, there is no requirement to paint the duct and conduits in the space.

48) Question: Is there a requirement to be certified for fire caulking?

Answer: Yes.

49)

Question:

Will

mechanical

provide

new

VFDs

for

chillers,

pumps,

cooling

towers;

typically

exclude

them,

mechanical

contractors

typically

get

package

deals

with

their

vendors

ensure

they

are

compatible

with

motor

loads;

have

RFI

question

the

rating

the

VFD

enclosures,

one

note

says

NEMA

and

another

says

NEMA

stainless

steel.

Please

clarify.

There

could

big

cost

difference

these

ratings.

Answer:

Contractor

will

supply

the

VFDs

for

the

cooling

tower

fans

and

pumps

meet

specification

requirements.

Chiller

manufacturer

will

supply

the

VFDs

meet

the

new

chiller

system

requirements.

The

rating

the

VFD

enclosures

shall

NEMA

stainless

steel.

50)

Question:

Data/Comm,

‐

not

see

any

scope

devices

shown

the

drawings

for

new

Data/Comm.

Are

there

any

new

Data/Comm

devices

installed,

and

so,

how

many

and

where

are

they

located?

Answer:

The

scope

the

Data

and

Communications

will

provided

the

Schneider

Electric

Program

office

part

their

design.

Refer

Spec

Section

–

INSTRUMENTATION

AND

CONTROLS

FOR

HVAC,

Part

(1.1)(D)(10)

for

current

information.

51)

Question:

Access

Control,

don’t

really

see

any

scope

shown

the

electrical

drawings,

but

recall

them

showing

several

doors

that

are

replaced

and

have

card

readers

installed.

need

cover

boxes

raceways

only?

Will

you

covering

the

cabling

via

the

preferred

FAA

vendor?

you

know

how

many

doors

and

the

extent

conduit

that

will

need

installed?

Answer: See Door Schedule in the drawing set A801 for location of doors. Honeywell is the current provider of these services.

52)

Question:

Lightning

Protection:

the

contractor

responsible

for

this?

Should

reach

out

National

Lightning

Protection

cover

this?

Answer:

Contractor

responsible

for

providing

lightning

protection

work.

Contractor

must

the

most

current

lightning

protection

standard

NFPA

780

–

Standards

for

the

Installation

Lightning

Protection

Systems

and

FAA‐STD‐019f

–

Lightning

and

Surge

Protection,

Grounding,

Bonding,

and

Shielding

Requirements

for

Facilities

and

Electronic

Equipment.

See

attachment

“Question

52,

and

‐

FAA‐STD‐019f”.

53)

Question:

Please

confirm

that

the

engineering

team

has

verified

new

specified

chillers

will

able

routed

down

into

the

existing

location

and

the

best

route.

Answer:

Best

route

for

chiller

passage

has

been

confirmed

the

exterior

areaway

the

south

side

the

boiler

room

B116.

This

the

same

location

that

has

been

used

every

other

site

and

should

provide

ample

clearance

for

equipment

passage.

Exterior

stair

assembly

must

removed

for

clearance.

54) Question: Will the temporary fencing the contractor brings in be required to be grounded or have lighting protection?

Answer:

Yes.

The

contractor

will

provide

the

temporary

fencing

around

the

temporary

equipment

space

for

security

and

hazard

requirement.

The

contractor

will

provide

grounding,

bonding

and

lightning

protection

for

the

temporary

electrical

equipment

and

other

mechanical

pipes

the

temporary

equipment

space.

55)

Question:

M‐203

shows

new

Chilled

water

bypass

(notes

6).

The

current

location

above

desks

drop

ceiling.

There

little

room

that

the

ceiling

tiles

are

cut

out

allow

for

the

roller

hangers

still

spin.

Please

advise

how

are

install

6”

bypass

line,

complete

with

valves

and

where

hot

tap

machine

will

fit

(zero

clearances

above

too).

Answer: This location can be adjusted for constructability, but may cause the need to move DP and flow sensors.

56)

Question:

Page

Z131,

Note

requires

3rd

temporary

air‐cooled

chiller

with

the

same

piping

configuration

and

specs

standby

locally

with

the

ability

hooked

and

started

the

Longmont

campus

within

hours’

notice.

The

only

possible

way

for

this

3rd

temporary

chiller

guaranteed

that

the

project

site,

and

guaranteed

the

same

specs,

size,

and

piping

requirements

for

the

contractor

rent

that

additional

chiller

and

already

have

stored

site

for

the

duration

the

temporary

chiller

plants’

existence.

Two

questions:

1. Is their space at the Longmont facility to accommodate the 3rd chiller?

Answer:	Yes.
____________________________________________________________________________________________________________________

2. Is it the FAA’s intent to pay for and include the rental cost of the additional 3rd chiller in the GC’s pricing proposal?

Answer: Yes.

57)

Question:

What

approximate

percentage

the

work

the

contract

will

required

performed

during

the

night

hours,

approximately

10:00

PM‐6:00

AM?

Answer:

the

Contractor’s

responsibility

determine

(and

subsequently

identify

their

project

schedule)

the

hours

required

outside

the

specified

normal

working

hours,

using

specified

requirements

and

constraints

such

explicit

language

pertaining

cutovers.

58)

Question:

Spec

Section

014000‐3

states

the

contractor’s

Project

Quality

Control

manager

shall

not

have

other

project

responsibilities.

the

FAA’s

intent

have

full

time,

on‐site

QCM

for

the

duration

the

project

that

cannot

either

the

Superintendent,

Safety

Manager,

Project

Manager?

Answer: No, that is not the FAA’s intent. QCM and SSHO may be the same person. See also the answer to Question 59 below.

59)

Question:

Spec

Section

013529‐2

states

the

SSHO

must

on‐site

during

working

hours

implement,

administer,

and

enforce

Contractor’s

safety

and

health

program

and

APP.

o SSHO may not be the Contractor’s superintendent.

o SSHO may be the Contractor’s quality control manager and must report to a senior Project or corporate official.

This

verbiage

conflicts

with

spec

section

014000‐3

that

states

that

the

QCM

shall

not

have

other

project

responsibilities.

Please

clarify

the

number

full

time

employees

requiring

onsite.

understanding

that

the

contract’s

intent

would

require

full

time

superintendent

and

full

time

QC/Safety

Manager

site

all

times.

Or,

are

you

requiring

separate

full

time

personnel

(super,

QC,

Safety)

site

all

times?

Answer:

Spec

Section

013529,

Part

(1.7)(B)

correct.

The

SSHO

must

onsite

during

working

hours.

The

same

person

may

serve

both

the

QCM

and

SSHO

roles

simultaneously,

but

neither

can

the

contractor’s

Superintendent

Project

Manager

simultaneously.

60)

Question:

Please

detail

the

security

requirements

and

timelines

for

bringing

new

employee/worker

site

Longmont,

including

the

timelines

for

approval

the

different

types

badging

and

how

long

worker

will

allowed

work

onsite

under

temporary

badge.

Answer:

Contractor

submits

names

personnel

that

will

receive

PIV

badges

the

Contracting

Officer’s

Representative

(COR)

and

also

enters

the

information

into

the

FAA

“VAP”

security

system.

Once

information

entered

into

the

system,

can

take

four

(4)

weeks

for

background

and

issuance

badges.

Most

workers

will

provided

temporary

visitor

badges

daily

basis.

Personnel

that

are

badged

will

have

escort

privileges

and

will

required

escort

workers

with

daily

temporary

badges

all

times.

the

Contractor’s

responsibility

ensure

that

enough

personnel

are

PIV

badged

that

escorting

will

not

issue

the

case

work

being

performed

different

areas

the

facility

simultaneously.

61)

Question:

Pump

schedule

calls

for

2‐stage

pump

(turbines),

but

there

isn’t

spec

section

for

this

type

pump.

Will

one

provided?

(Section

232123

–

2.4

does

not

apply).

Answer: See highlighted areas of revised specs section 23 21 23 attachment “Question 61 – 23 21 23 Hydronic Pumps Amendment”.

62)

Question:

Cooling

Tower

Schedule

basis

design

Tower

Tech

(we

are

the

local

Tower

Tech

rep),

but

the

following

items

the

specifications

not

apply

Tower

Tech

(please

clarify):

Question:

Page

721

the

specs

list

the

tower

“induced

draft”.

There

provision

for

“forced

draft”

(Tower

Tech

forced

draft).

Answer: The FAA requires a forced draft cooling tower.

b) Page 723 reiterates “induced draft” (Tower Tech is forced draft).

Answer:	Same	as	above	question	(a).
________________________________________________________________________________________________________________________

c) Page 724 Section H lists louvers as part of the supply of the cooling tower (Tower Tech does not have louvers).

Answer:	Louvers	are	optional,	depending	on	the	cooling	tower	type.
_________________________________________________________________________________________________________________________

Page

724

Section

says

that

the

fan

needs

balanced

after

assembly

and

that

fan

screens

have

304

wire

mesh

(Tower

Tech

utilizes

individual

direct

drive

motors,

which

not

require

balancing).

Answer: Fans should be balanced by the manufacturer. Upon building, they don’t need to be balanced onsite.

e) Page 725 Section J says that motors are TEFC (Tower Tech utilizes TEAO motors).

Answer:	Both	TEFC	and	TEAO	are	fine.
________________________________________________________________________________________________________________________

f) Page 725 Section K says to supply vibration switch (Tower Tech does not require).

Answer: FAA requires vibration switch. The switch is to be supplied by the controls’ contractor to ensure proper fan operation.

g) Page 725 Section M says to provide access doors for entering cooling tower (Tower Tech does not require).

Answer:

Whether

access

doors

are

needed

will

depend

upon

the

manufacturer’s

design

the

cooling

tower.

the

manufacturer

Tower

Tech,

whose

cooling

towers

not

contain

gearbox,

access

doors

will

not

required.

approved

equal

manufacturer’s

cooling

tower

approved,

the

requirement

access

doors

will

dependent

upon

the

design

the

cooling

tower.

63)

Question:

Tower

Tech

suggests

rotating

the

towers

degrees

order

reduce

piping

requirements

and

reduce

the

risk

recirculation.

See

attached

drawing

notes.

Answer: To maintain seismic design, the proposed drawing will stand. Recirculation is not a primary concern.

64) Question: 230548 – 2.1 and 2.2 – can Vibro‐Acoustics be added to the list of acceptable manufacturers?

Answer:

List

manufactures

not

limited

those

vendors

the

list.

The

list

provided

are

known

manufacturers

the

FAA.

Any

manufacturer

that

meets

the

specs

may

approved,

even

not

listed.

65)

Question:

Please

clarify

NEMA

Enclosure

requirements

for

the

pumphouse

electrical

equipment.

General

Note

Drawing

ZDV‐1401893‐E204

says

VFDS

disconnects

inside

and

outside

the

pumphouse

are

NEMA

stainless

steel

and

other

equipment

within

the

pumphouse

should

NEMA

3R.

Does

that

note

apply

the

new

electrical

room

addition

and

that

room

considered

part

the

pumphouse?

all

the

new

electrical

panels,

transformer,

potential

harmonic

filters,

etc.,

within

the

new

addition

need

NEMA

12?

The

new

wireway

shown

Drawing

ZDV‐1401893‐E302

NEMA

per

Key

Note

and

the

two

new

electrical

panels

are

NEMA

12;

rating

shown

for

the

transformer.

Answer: All the VFDs, electrical panels and a step down transformer NEMA ratings are 12.

66)

Question:

Please

clarify

which

trade

provide

all

new

Variable

Frequency

Drives.

Typically,

the

mechanical

contactor

provides

them

package

component

with

new

pumps,

cooling

towers,

chillers,

etc.

ensure

they

are

compatible

with

the

motor

loads

they

are

controlling

and

the

electrical

contractor

installs

them.

that

correct?

Answer:

Contractor

will

supply

the

VFDs

for

the

cooling

tower

fans

and

pumps

meet

specification

requirement.

Chiller

manufacturer

will

supply

the

VFDs

meet

the

new

chiller

system

requirement.

67)

Question:

Please

clarify

Key

Note

Drawings

E204

E714

regarding

the

potential

harmonic

filters

for

the

(3)

cooling

towers

and

the

(2)

chillers.

Where

says

contractor

should

test

circuit

and

only

install

the

harmonic

filters

the

distortion

exceeds

FAA

specifications:

shouldn’t

these

harmonic

filters

possibly

considered

Add

Alternate

Deduct

Alternate

the

project

pricing

they

may

not

necessary

until

testing

has

determined

they

will

required?

Answer:

For

all

cooling

tower

fans

and

pumps,

use

6‐pulse

VFD

drives.

need

install

the

harmonic

filters.

For

the

chiller,

contractor

shall

provide

chillers

including

VFDs

and

filters

that

meet

the

requirement

for

reducing

THD.

68)

Question:

Please

clarify

scope

work

for

Panels

HC3

HC4;

the

drawings

indicate

that

all

loads

and

feeds

are

removed

from

the

source.

How

many

circuits

are

currently

installed

within

these

two

panels?

What

are

these

circuits

currently

feeding

and

what

other

demo

associated

these

circuits?

Are

demo

outlets,

equipment,

etc.

well?

Also,

where

are

Panels

CPC‐

A,B,C

located

that

feed

these

panels?

What

are

the

conduit/wire

sizes

lengths

the

feeds

between

the

panels?

Answer:

Panels

HC2

and

HC3

are

the

reconditioned

panels.

HC1,

HC2,

HC3,

and

HC4

have

circuits

each,

but

there

are

active

circuits

any

the

panels.

Demo

all

conduits,

outlets,

and

branch

circuits

for

panels

HC1,

HC2,

HC3,

and

HC4.

Remove

all

feeders

back

the

source

for

panels

HC1

and

HC4.

Panels

CPC‐A,

are

located

B13

the

Automation

Wing

Basement,

critical

power

vault.

Feeders

for

panels

HC1

and

HC4

will

removed

the

source.

Feeders

for

HC2

and

HC3

will

retained

for

re‐use.

feeder

conduit

removal

required.

69)

Question:

Please

clarify

scope

provide

panel

schedules

for

Panels

HC1

HC2

which

are

reconditioned.

Are

there

existing

loads

within

these

panel

boards

that

may

need

temporarily

fed

from

another

source

while

the

panels

are

being

reconditioned?

How

many

loads

are

currently

installed

within

these

panels?

Are

there

any

new

loads

installed

within

these

panels?

How

many

new

circuit

breakers

will

required

and

what

are

the

sizes/ratings?

all

existing

wire

remain

and

reused/terminated

the

reconditioned

panel?

What

existing

wiring

too

short?

Will

these

panels

possibly

have

reconditioned

during

special

outage

timeframe,

possibly

night,

requiring

overtime?

Also,

please

clarify

the

scope

the

Government

Provided

Paragon

Transfer

Switches

associated

with

these

two

panels.

Where

are

they

installed?

What

the

size

these

switches?

Are

they

wall

mounted,

floor

mounted,

recessed

these

panels?

What

are

the

conduit

wire

size

requirements

for

these

switches

the

onelines

not

indicate.

Are

the

existing

remain?

appears

that

CPC‐A

may

new

feeds.

Answer:

Panels

HC2

and

HC3

are

the

panels

that

will

reconditioned.

There

are

existing

loads

for

these

panels,

new

loads

will

need

installed,

and

these

panels

not

need

new

circuit

breakers.

Only

the

feeders

need

remain.

There

special

outage

timeframe

for

reconditioning

panels

HC2

and

HC3.

The

Government

Provided

Paragon

Transfer

Switches

are

wall

mounted

and

recessed

above

the

panels.

The

conduit

and

wire

size

will

the

same

size

the

feeders.

70)

Question:

Please

provide

information

specification

requirements

for

the

new

Signal

Reference

Grid

(SRG)

that

installed

under

the

Host

Computer

Room

raised

floor.

There

does

not

appear

any

specifications

details

for

this

scope.

Please

clarify

materials,

sizing,

manufacturer,

installation

details,

etc.,

for

the

SRG.

Answer:

FAA‐STD‐019f,

4.7.3.2.a

Signal

Reference

Ground

Grid:

SRGG

shall

consist

grid

2‐in

wide

copper

strips,

gauge

thicker,

placed

2x2‐ft

square

grid

and

welded

each

grid

intersection.

71)

Question:

Please

clarify

4/0

perimeter

grounding

loop

existing

new

installed

under

this

project.

Note

Drawing

ZDV‐1401893‐E215

says

it’s

existing,

but

Specification

Summary

Pg.

011000‐5_3_e_ii

says

install.

Also,

please

clarify

there

are

(3)

new

4/0

cross

connects

installed

across

the

room

running

from

North

South

bonding

the

perimeter

ground

ring

well,

these

are

existing?

Answer:

4/0

perimeter

grounding

loop

existing.

No,

(3)

new

4/0

cross

connecting

the

perimeter

ground

the

North

and

South

walls

not

existing

and

not

required

installed.

The

drawing

and

Specification

summary

will

updated

represent

these

changes.

72)

Question:

Please

clarify

all

Panels

within

the

Host

Computer

Room

are

bonded

the

new

4/0

perimeter

ground

ring,

including

Panels

HC3

HC4.

There

are

bold

points

identifying

the

existing

panels

located

along

the

East

Wall,

except

Note

Drawing

ZDV‐1401893‐E215;

however,

where

Note

shown,

there

are

electrical

panels.

Answer:

Panels

HC2

and

HC3

are

the

reconditioned

panels.

Panels

B‐B134‐BS1,

B‐B134‐BS2,

HC2,

and

HC3

are

currently

not

bonded

the

existing

4/0

perimeter

ground,

the

contractor

will

required

bond

four

(4)

enclosures

perimeter

grounding

conductor

exothermic

welding

accordance

with

FAA‐STD‐019f

(see

Attachment

“Question

52,

72,

and

–

FAA‐STD‐019f”).

73)

Question:

Please

clarify

all

the

Multiground

Plates

referenced

Note

Drawing

ZDV‐1401893‐E215

are

existing

there

are

new

ones

installed

per

this

project.

How

are

the

existing

Multiground

Plates

currently

bonded

together?

Are

demo/remove

any

existing

grounding

system

once

the

new

system

installed?

Answer:

All

the

multiground

plates

referenced

Note

are

existing

multiground

plates.

need

install

new

multiground

plates.

The

Existing

multiground

plates

are

verified

properly

bonded

perimeter

grounding

conductor

exothermic

welding

accordance

with

FAA‐STD‐019f.

further

action

needed.

74)

Question:

Please

clarify

and/or

provide

details

how

the

existing

cable

tray

grounded

and

how

often;

connected

the

ground

loop,

SRG,

multiground

plate?

Answer: Refer to attachment “Question 52, 72, and 74 ‐ FAA‐STD‐019f”.

75)

Question:

Please

clarify

irreversible

compression

grounding

connections

can

utilized

for

the

Host

Computer

Room

new

grounding

system,

lieu

exothermic

welding,

this

will

inside

and

may

cause

issues

with

the

Fire

Alarm

System

and

smoke

detectors.

Answer: The new grounding system is requires exothermic welding.

76)

Question:

Please

clarify

the

Type

RL1

light

fixtures,

Exit

Signs

the

Host

Computer

Room

shown

Drawing

ZDV‐1401893‐E212

are

new

light

fixtures,

they

are

existing

remain

with

new

lenses

installed

identified

Specification

Summary

Pg.

011000‐6_3_e_iv.

Answer: RL and RL1 are to be replaced with new light fixtures. Exit signs are to be replaced with new wall mounted LED exit signs.

77)

Question:

Please

clarify

electrical

demo

scopes

for

the

temporary

offices

per

Note

Drawing

ZDV‐1401893‐E114.

How

many

electrical

data/comm

outlets

are

located

with

these

offices

that

are

demo?

Also,

what

done

with

the

light

fixtures

light

switches?

Are

they

existing

remain?

Will

light

fixtures

have

relocated

and

so,

how

many

fixtures

are

there,

and

how

are

they

controlled?

Answer:

All

electrical

and

data/comm.

outlets

are

demoed

the

office

locations.

light

fixtures

light

switches

need

demo’d;

the

existing

are

remain.

Light

fixtures

and

switches

not

need

relocation

and

not

necessary

control

them

they

are

already

controlled.

78)

Question:

Please

clarify

scopes

work

associated

with

MCC

1A,

1B,

1C,

Specification

Summary

Pg.

011000‐

5_3_D_i

thru

iv.

The

project

summary

makes

reference

removing

and

replacing

these

MCC’s

and

provide

harmonic

testing

the

feeder

sides

these

MCC’s;

however,

the

job

walk

was

mentioned

that

replacement

these

MCC’s

covered

under

separate

project

and

not

part

this

contract.

Also,

please

clarify

replacing

circuit

breakers

within

these

MCC’s

are

required.

Sheet

Note

the

various

MCC

one‐line

diagrams

says

verify

fuse/breaker

size

ensure

proper

coordination.

Are

replace

the

circuit

breakers

they

are

not

the

correct

size

rating

for

the

new

loads?

Answer:

The

MCCs

(A,B,C,

1A,

1B,

project

that

included

the

harmonic

testing

tasks

the

MCCs’

feeder

sides

are

covered

under

separate

project.

The

MCCs

project

not

part

the

Major

Mechanical

project.

Note

from

the

one

line

diagram

for

field

checking.

Whether

the

fuse/circuit

breaker

will

need

replaced

dependent

upon

the

product

submittal

that

the

contractor

submits

for

approval.

they

are

different

size

than

what

the

drawings,

they

will

need

replaced.

79)

Question:

Please

clarify

lightning

protection

required

for

AHU‐400

identified

Specification

Summary

Pg.

011000‐6_3_g_i.

appears

that

this

AHU

located

inside

the

building

Mech.

Rm.

B129

and

the

drawings

not

show

note

any

lightning

protection

associated

with

this

unit.

Answer: Lightning protection will not be required for AHU‐400.

80)

Question:

Please

clarify

exterior

outlets,

unit

heaters,

lighting

requirements/scopes

work

associated

with

the

temporary

chillers.

Are

provide

light

poles,

mount

lights

upon

the

temporary

chillers,

the

temporary

fence?

Where

will

electrical

outlets

required

and

how

many?

Answer:

The

contractor

will

provide

exterior

outlets,

unit

heaters

and

temporary

lighting

around

the

temporary

equipment

space.

The

contractor

provide

proper

foot‐candle

levels,

adequate

power

outlets,

and

heaters

that

are

required

for

the

service

and

maintenance

work.

The

contractor

will

also

provide

temporary

fencing

around

the

temporary

equipment

space

for

security

and

hazard

requirement.

81)

Question:

Please

provide

specifications

and

clarify

water

line

heat

tracing

requirements/scopes

work

associated

with

the

temporary

chillers

and

the

new

cooling

towers.

the

heat

trace

controlled

with

individual

thermostats

one

common

heat

trace

controller?

Are

any

alarms

monitoring

heat

trace

BAS

required?

Answer:

Heat

trace

for

the

piping

the

permanent

cooling

towers

may

any

commercially

available,

industrial

grade,

self‐

regulating,

heating

cable

product

designed

provide

freeze

protection

metallic

piping.

this

type

product,

the

heat

output

the

cable

varies

response

the

surrounding

conditions

along

the

entire

length

circuit.

Whenever

the

heat

loss

the

insulated

pipe

increases

(as

ambient

temperature

drops),

the

heat

output

the

cable

increases.

Conversely,

when

the

heat

loss

decreases

(as

the

ambient

temperature

rises

product

flows),

the

cable

reacts

reducing

its

heat

output.

The

manufacturer’s

recommended

method

control

used.

monitoring

the

Building

Automation

System

(BAS)

required.

82)

Question:

Please

clarify

where

and

how

the

new

electrical

panels

associated

with

the

temporary

chillers

are

installed.

Will

new

concrete

equipment

pads

required?

Are

they

installed

freestanding

unit

strut

racks?

Answer:

New

concrete

equipment

pads

are

not

required

for

the

temporary

chillers.

portable

equipment

pad

suitable.

Freestanding

unit

strut

racks

mount

temporary

panels

and

step

down

transformer

are

possible

solution.

83)

Question:

Please

provide

detail

and

clarification

for

branch

circuit

conductors

from

the

I‐Line

Panel

the

temporary

chillers.

Note

Drawing

ZDV‐1401893‐Z141

says

these

are

the

temporary

chiller

provider.

Are

these

conductors

installed

conduit?

Can

they

just

temporary

cables

bundled

together?

How

are

they

routed

the

I‐Line

Panels

laying

the

ground?

Answer:

Conductors

from

the

I‐Line

Panel

the

temporary

chillers

are

installed

conduit

(EMT

for

temporary

okay).

The

temporary

conduits

routed

the

I‐Line

panel

are

elevated

off

the

ground,

not

laying

the

ground.

84) Question: Will a light fixture schedule be provided?

Answer:

The

light

fixture

schedule

has

been

provided

Drawing

E601.

provides

description

and

known

acceptable

manufacturer

and

model

number,

but

contractor

can

provide

equal

product

subject

approval.

85)

Question:

Will

the

VFDs

supplied

from

the

respective

equipment

manufacturers

will

they

part

the

electrical

contractor’s

gear?

Answer:

Contractor

will

supply

the

VFDs

for

the

cooling

tower

fans

and

pumps

meet

specification

requirement.

Chiller

manufacturer

will

supply

the

VFDs

meet

new

chiller

system

requirement.

86)

Questions

regarding

chiller

specifications

(section

16).

assumption

that

someone

worked

with

Trane

the

chiller

selection

and

most

these

questions

will

easy

answer

(if

the

specs

were

written

based

Trane

specs):

Question:

Seismic

–

you

require

OSHPD

certification?

want

make

sure

that

not

provide

unit

that

overkill

regards

seismic.

experience,

neoprene

isolators

will

suffice

but

don’t

want

assume

that

case

missing

something

within

ASCE/SEI

Answer: Neoprene mounts are sufficient.

Question:

Coordinating

witness

test.

Who

would

the

individual(s)

that

will

witness

the

test?

Can

coordinate

with

them?

Answer:

Contracting

Officer’s

Representative

(COR),

Project

Engineer

(PE),

FAA

site

personnel,

etc.

Yes,

you

will

coordinate

through

the

COR.

c) Question: Would a refrigerant‐cooled VFD be acceptable or is air‐cooled the only allowable option?

Answer:

The

preferred

method

air‐cooled.

The

concern

would

refrigerant

cooling

used,

and

the

temperature

below

DP,

could

condense.

this

not

the

case

would

valid

method

cooling.

d) Question: Does this unit need to ship knockdown or would knockdown in the field be acceptable?

Answer: Either way is acceptable as long as it meets manufacturer recommendations.

87)

reviewing

the

drawings

and

just

noticed

that

the

structural

drawings

not

show

new

catwalk

system

with

associated

footings

required.

There’s

small

set

stairs

the

end

the

cooling

towers

(sheet

S104)

but

doesn’t

appear

give

access

all

the

cooling

towers.

Should

there

new

catwalk

platform

included

this

project?

Answer: No catwalk at the top of the cooling towers. Just the platform below all the cooling towers.

88) Chiller rental questions:

a) Question: What is the length of electrical run for each unit? To be provided by Trane rental service?

Answer:

Refer

Drawing

Z101,

estimated

approximately

100

ft.

Yes,

provided

rental

service.

_____________________________________________________________________________________________________________

b) Question: What is the length of hose runs for each unit? To be provided by Trane rental service or is hard‐piping required?

Answer:	Hard‐piping	is	required.	Refer	to	Drawing	Z101.
								____________________________________________________________________________________________________________

c) Question: Would Trane provide startup/training of rental equipment?

Answer: Yes, startup/training of rental equipment is required.

89)

Question:

Will

any

manufacturer

accepted

other

than

those

listed

the

project

specification

document?

For

example,

there

any

other

chiller

manufacturer

that

would

accepted

other

than

Trane?

Answer:

The

FAA’s

requirement

for

TRANE

chillers

only.

The

facility

has

total

four

(4)

chillers

and

only

two

(2)

are

being

replaced.

The

FAA

requiring

the

same

manufacturer

for

the

new

chillers

for

consistency

and

standardization.

90)

Question:

With

regards

this

project,

would

alternate

controls

system

accepted?

Specifically

Siemens

Talon

Controls

which

open

“Tridium”

based

system

that

would

equal

the

current

specified

system.

Answer:

alternate

controls

systems

will

accepted/approved

for

this

project.

The

FAA

utilizing

Schneider

Electric

controls

all

its

ARTCC

facilities

for

consistency

and

standardization.

92) Question: Where is FAA Order 6000.50E as per Section 011000 1.4.A.4.a.iv located? Please provide.

Answer: See attachment “Question 92 – FAA Order 6000.50E”.

93) Question: Is this project one that mechanical contractors are permitted to bid as the prime contractor?

Answer: Any contractor may submit an offer as the prime contractor.

94)

Question:

the

site

visit,

was

mentioned

that

the

sign

sheets

would

made

available

attendees.

Can

this

posted

the

website?

Answer: The site visit attendee list will be provided to whomever requests a copy. Email requests to cindi.tjelde@faa.gov.

95)

Question:

Will

the

FAA

provide

any

and

all

requested

information

paperwork

needed

obtain

sales

tax

exemption

with

the

State

Colorado?

Answer:

No.

The

FAA,

the

federal

government,

tax

exempt.

The

awardee

contractor

responsible

for

any

and

all

local,

state,

and/or

federal

taxes,

stated

Section

the

RFO:

“The

offered

price

must

encompass

all

costs

to……(b)

federal,

state,

and

local

taxes”.

96)

Question:

Per

the

RFO,

are

allowed

pages

max

for

the

technical

proposal.

Does

that

include

cover

page,

table

contents,

resumes,

page

breaks?

Answer: Yes, the entire technical proposal.

697DCK-18-R-00406 Amend 0002

Questions and Answers

File details come from the government source that posted it.