addendum no. 1 project: 600 zone water storage … no. 1 & q&as... · project: 600 zone...

ADDENDUM NO. 1

PROJECT: 600 Zone Water Storage Tank

CONTRACT: WTR.00007

To: Prospective Bidders of Record

Date: April 28, 2016

The following changes, additions, revisions, and/or deletions are hereby made a part of the

Contract Documents for the aforementioned Project as fully and completely as if the same were

fully set forth therein:

A. PART 1 – BIDDING REQUIREMENTS

1. Section 00410 – Bid Form

REPLACE: The existing Bid Form with the revised Bid Form included with this

Addendum.

B. PART 2 – CONTRACT FORMS

There are no changes to the Contract Forms in this Addendum.

C. PART 3 – CONTRACT CONDITIONS

1. Section 00800 – Supplementary Conditions

REPLACE Section 00800, Supplementary Conditions with the revised

Supplementary Conditions included with this Addendum

INSERT: Appendix 1 FAA – 2014 Determination of No Hazard to Air Navigation

and Extension – Included with this Addendum

D. PART 4 – SPECIFICATIONS

1. All Sections

REPLACE: Any reference to “Chambourcin Place”

WITH: “Chambourcin Court”

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2. Section 01 11 00 – Summary of Work

A. Part 1.05.B

REPLACE: with the following:

“B. Construction access road between Chambourcin Court and the Site shall be

installed within 60 days of Notice to Proceed as described in the Contract

Documents. The portion of the access road from Chambourcin Court to the

existing gravel driveway (as shown on the Drawings) will be used by others

performing work for the Owner on or in the vicinity of the Site. Contractor shall

maintain this portion of the access road at all times except when work is being

performed by others.

3. Section 05 52 19 – Steel Railing

A. DELETE: The word “painted” throughout as it pertains to galvanized steel

4. Section 09 97 13 – Steel Tank Coatings

A. Part 3.04.A.4.e

ADD: “3) In order to assist in the maximization of the paint’s lifecycle, all welds

on the tank exterior shall be ground smooth and blended to a NACE-D profile. All

welds on the tank interior shall be ground smooth and blended to a NACE-C

profile. Welds on the interior dry support column can remain in an as-welded

condition but must have a profile adequate for the specified paint system.

Engineer/Owner reserves the right to provide third-party inspection to ensure

compliance to this requirement.”

5. Section 33 16 19 – Elevated Potable-Water Storage Tank

A. Part 1.03.B.3.a

REPLACE: “(field verify)”

WITH: “(Contractor shall confirm elevation of installed structure – any

differences anticipated based on tank manufacturer geometry shall be stated as

such in submittals to be approved by the Owner)”

B. Part 1.03.B.3.b

REPLACE: “(field verify, as noted on Drawings)”

WITH: “(Contractor shall confirm elevation of installed structure – any

differences anticipated based on tank manufacturer geometry shall be stated as

such in submittals to be approved by the Owner)”

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C. Part 1.03.E.4

DELETE (the 1st sentence): “Bottom of column and riser foundation, minimum

of 2 feet below existing grade and 5 feet below finish grade.”

D. Part 1.05.A

DELETE: This paragraph in its entirety

E. Part 1.05.B.1.b

REPLACE: “Passive mixing system inlet design”

WITH: “Active mixing system design”

F. Part 1.06.A.2

REPLACE: “2. Experience (Including Tank Designer and Tank Installer): Ten or

more elevated tanks presently in potable water service, of familiar size and

character for this Project, all in satisfactory operation for minimum of 10 years.”

WITH: “2. Tank Manufacturers: 1) Chicago Bridge & Iron Company; 2)

Landmark Structures, Inc.; 3) Caldwell Tanks, Inc.”

G. Part 2.03.C

REPLACE: “Anchor Bolts and Nuts: ASTM A193/A193M, Grade B7 with

ASTM A194/A194M, Grade 2H heavy hex nuts or ASTM F1554, Grade 105 with

ASTM A194/A194M, Grade 2H heavy hex nuts.”

WITH: “Anchor Bolts and Nuts: Anchor rods (bolts) shall conform to ASTM

F1554 Grade 36 except where stainless steel or other approved anchor rods are

shown on the Drawings. Anchor rods shall have hexagonal heads and shall be

supplied with hexagonal nuts meeting the requirements of ASTM A563 Grade

A.”

H. Part 2.03.R.1

INSERT: The following sentence: “Overhead Rolling Door shall have a

dimension of 10’X 10’, as per the Drawings.”

I. Part 3.02.B.4

REPLACE: “Continuously seal weld roof, exterior, and interior joints above and

below elevation of top of shell curb angle to preclude crevice corrosion and rust

discoloration.”

WITH: “Continuously seal weld roof, exterior, and interior joints above and

below elevation of top of shell curb angle to preclude crevice corrosion and rust

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discoloration. Contractor shall also seal weld the underside of the tank’s welded

roof plates on the interior of the tank.”

J. Part 3.03.D

ADD: “3. Transition sections between the tank and shaft, and between the shaft

and “bell” shall be smooth, doubly curved, continuous “knuckle” sections of a

double curvature pressed formed nature with a maximum of eight vertical weld

joints. Discontinuous transitions and intersections through compression rings shall

not be acceptable for these transition sections.”

K. Part 3.03.D

ADD: “4. For the cone and ball plate(s) the Contractor shall minimize the number

and total length of visible weld seams (shop and field). A scaled plate layout

sketch shall be provided during the submittal process. The use of any ball plate

(excluding roof closure plates) with widths and/or lengths equal to or less than

72” is unacceptable.”

6. Division 40 – Process Integration

INSERT: Section 40 00 00, Submersible Mixer – Included with this

Addendum

E. PART 5 – DRAWINGS

1. Sheet C02 – General Notes and Details

A. Security Gate Detail Sheet Reference Identification:

REPLACE: “C102/C113”

WITH: “E-3”

2. Sheet C03 – General Notes and Details

A. Elevation Detail:

REPLACE: “Elev. = 600.50 FT”

WITH: “Elev. = 600.00 FT”

B. Elevation Detail:

REPLACE: “±431.50 FT”

WITH: “±431.00 FT”

3. Sheet C05 – Loudoun Water Details

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INSERT: Loudoun Water Standard Details CP-1 & CP-2 – Included with this

Addendum

4. Sheet C12 – Erosion & Sediment Control – Construction Access

A. Construction Road Stabilization Remediation Note 4:

REPLACE: “A minimum of 6” of compost will be”

WITH: “A minimum of 6” of compost shall be”

5. Sheet C21– Landscape Plan

REPLACE: Sheet C21

WITH: Sheet C21 – Included with this Addendum

6. Sheet C22– Landscape Details

REPLACE: Sheet C22

WITH: Sheet C22 – Included with this Addendum

7. All Sheets

REPLACE: All references to “Chambourcin PL.”

WITH: “Chambourcin CT.”

8. Sheet 29 – Structural / Mechanical

A. Sheet Keynotes No. 2:

ADD: “See Section 33 16 19 – 11, Part 2.03.R.1”

B. Sheet Keynotes No. 4:

REPLACE: “to be determined by Contractor.”

WITH: “to be determined by Tank Manufacturer.”

C. Ground Floor Plan – Referencing the Roll-Up Door:

REPLACE: “12’W X 12’ H”

WITH: “10’ W X 10’ H”

D. Section B – Referencing the Roll-up Door:

REPLACE: “12’ X 12’”

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WITH: “10’ X 10’”

E. Section C:

REPLACE CALLOUT: “6” PVC Process Drain, Slope to Drain”

WITH CALLOUT: “6” PVC Process Drain, Slope to Overflow Catch Basin”

F. Section C:

REPLACE CALLOUT: “16” V500 TYP”

WITH CALLOUT: “16” V500 TYP 3”

7. Sheet 30 – Structural / Mechanical

A. Tank Elevation (Platform and railing Call-out):

DELETE THE WORD: “Painted”

B. General Sheet Note 6:

DELETE THE WORD: “Painted”

9. Sheet 32 – Electrical

A. Sheet Keynotes 5:

REPLACE THE WORD: “supplied and installed by the HVAC.”

WITH THE WORD: “supplied and installed by the Contractor.”

10. Sheet 34 – Electrical

INSERT: “Detail [4/C02]” at the “Sliding Gate Motorized Actuator” call-out

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Attachments

1. Revised Bid Form

2. Revised Supplementary Conditions

3. Section 40 00 00, Submersible Mixer Specification

4. FAA – 2014 Determination of No Hazard to Air Navigation and Extension

5. Construction Details – CP-1 & CP-2

6. Revised Sheets C21 & C22

END OF ADDENDUM

WRITTEN QUESTIONS AND ANSWERS (GROUP 1 OF 2)

PROJECT: 600 Zone Water Storage Tank

CONTRACT: WTR.00007

To: Prospective Bidders of Record

Date: April 28, 2016

The questions listed below are those that have been received via email at

[email protected] requesting clarifications to the Bidding Documents. The

corresponding answers are for information only and do not change the Bidding Documents for

the aforementioned Project. See Addendum No. 1 for any changes to the Bidding Documents

associated with these questions and answers.

Q1. Section 33 16 19 Part 1.05.B.1.b states “Passive mixing system inlet design and

representative CFD modeling results.” The plans show a mechanical mixer. Can an

addendum be issued to add the Tideflex Mixing System (TMS) as an alternate to the

mechanical mixer?

A1. See changes to the Bidding Documents per Addendum No. 1.

Q2. Section 33 16 19, Part 1.03.B.3.a/b references the tank's height as "field verify". Are

you requesting that we survey / match Loudoun Water’s other tank(s)?


Q3. Section 33 16 19, Part 1.03 E discusses the need for a "deep foundation". Since the

wording of sub-item E.4 (i.e. the mention of columns/risers) appears to be a "move-up"

from previous tank project (i.e a multi-legged style tank) is the reference to a "deep

foundation" also a carry-over? Otherwise, if the tank firm feels that something other

than a deep foundation is appropriate, I assume we can base on our bid on that instead?

Note(s) on Drawing(s) 29 & 30 seems to confirm this thinking.

A3. Per Section 31 23 17, Part 1.03.E of the Contract Documents, the

Contractor is to hire his own Geotechnical Engineer to determine a suitable

foundation for the tank. The need for a deep foundation shall be made by

the Tank Manufacturer’s Geotechnical Engineer, as registered in the

Commonwealth of Virginia.

Q4. Section 33 16 19, Part 1.06 A.2 - please confirm that Loudoun's Experience

Requirement requires the bidder to have built ten (10) Waterspheroid style tanks of 1

MMG or larger capacity, and in operation for the past ten years. And that this level

mailto:[email protected]

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takes precedence over the conflicting experience level(s) listed in Article 7.01.C of the

Bid Form (i.e. a watered down version that only requires 3 tanks in the past 5 years; it

also appears to allow someone other than the tank designer/installer to bid as the Prime

on this project) as well as tank spec item 1.5.A.1 (Submittals), both of which will

require revision to match the ten-in-ten requirement.


Q5. Section 33 16 19, Part 1.06 A.2.a.2 - the second Tank Manufacturer listed has zero

experience with this style of tank (when considering large capacities such as this one)

and thus the name should be deleted.

A5. No changes to the Bidding Documents will be made.

Q6. Section 33 16 19, Part 3.02.B.4 - please confirm that we are to seal-weld the interior /

underside of the tank's lap welded roof plates. We typcially recomend this so as to

increase the tank's lifespan.


Q7. Sheet 29 - The 'ground floor plan' shows the use of a 12' x 12' overhead door. This is

extremely large for this style of tank (Waterspheroid) and will require extensive

stiffening of the tank's "bell" in order to allow this large of an opening. In addition it

will be costly, and thus we suggest Loudoun consider whether a 10' x 10' (or even

smaller) door would provide the access hoped for. There is not a lot of room inside of a

Waterspheroid for truck parking, etc. (like a Composite or Hydropillar provides) so we

don't typically see the need for such as large door.

A7. See changes to the Bidding Documents per Addendum No. 1. Owner will

allow the overhead door to be 10’ X 10’.

Q8. Section "C" shows an 8" 6” Carrier Pipe, as well as the need to "extend it above the

TWL". At the pre-bid meeting please expand on what this system will be used for, who

installs it, and what (if any) responsibilities the tank vendor has on this system.

A8. This carrier pipe will be used for a future chemical dosing application.

Contractor is responsible for installing this 6” steel carrier pipe. Carrier

pipe shall extend 1’ above TWL for future dosing purposed.

Q9. Does the concrete floor inside the tank require any coatings?

A9. Per Section 09 90 00 – 10, Part 3.06.A.1, no paint shall be applied to exterior

masonry and concrete surfaces, unless specifically indicated.

Q10. Sheet 30: The roof-top railing system states 'painted galvanized steel platform and

railing'. One, we typically do not recommend painting galvanized steel, and two, please

confirm that there is no structural platform inside of the railing system (typically the

area is flat enough for workers to walk directly on the tank's roof plates).

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Q11. Sheet 30: Note 6 references the need for "flat sections" on the roof railing so that future

antenna's can we welded onto them. Does Loudoun have a specific detail they wish us

to provide? Do you anticipate needed "kickers" on the railing also?

A11. No specific detail will need to be provided. A bottom railing can be

included.

Q12. Please confirm the Validity period the bond is to be written for - 60 days?

A12. Loudoun Water’s bid bond is effective 61 days from day of bid opening.

Q13. The Soils Report appears to only provide boring logs and the laboratory test results and

does not have any Recommendations section/summary pertaining to the tank's

foundation. Did the Geotech prepare an interpretive report with his thoughts on the

style of foundation needed (i.e. is that where the micropiles idea, shown in the dwgs,

came from?). How about his estimate for settlement, etc? Note it is very un-common

to have the tank contractor perform this type of analysis.

A13. Data is provided for the Contractor’s information purposes only. Per

Section 31 23 17, Part 1.03.E of the Contract Documents, the Contractor is

to hire his own Geotechnical Engineer to determine a suitable foundation

for the tank. The need for a deep foundation shall be made by the Tank

Manufacturer’s Geotechnical Engineer, as registered in the Commonwealth

of Virginia. Should the Tank Manufacturer’s Geotechnical Engineer

recommend and Contractor elect to install micropiles for the tank

foundation, the micropiles shall be in accordance with Section 31 23 17.

Q14. Please confirm where the tank firm's scope starts/stops as it relates to the Verizon and

Dominion Electric work.

A14. See Section 26 05 02, Part 1.03 of the Contract Documents, for the

Contractor’s responsibility under this Work.

Q15. It was confirmed that the project does not have any BUY-USA, Prevailing Wage, or

MBE requirements, correct?

A15. Correct, there are no BUY-USA, Prevailing Wage, or MBE requirements

for this Project.

Q16. Other than V-DOT road access permits, will Loudoun Water be providing/paying for all

other permits?

A16. Per Section 00800, Supplementary Conditions, Part SC-6.08 Permits:

Loudoun Water will provide the permits listed within this section by Notice

to Proceed.

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Q17. Who maintains the gravel road (perhaps Loudoun should consider this effort as a T&M

item since different firms will be using it)?


Q18. Will crops continue to be grown in the tank area field? How far around the tank site

does Loudoun have easement rights to?

A18. Loudoun Water will have control of all area within the LOC and these

areas will be used exclusively for construction during the duration of the

Project. Activity outside of the LOC is not under Loudoun Water’s control.

Q19. Is the cul-de-sac address Chambourcin PLACE or COURT (the dwgs and an on-site

sign conflict)?


Q20. Who will be approving our design drawings? Loudoun Water or CH2M? Any onsite

third party inspection planned, and if so, who?

A20. Per Section 00800, Supplementary Conditions, Part SC-1.01, at the pre-

construction meeting, Owner will identify the engineering firm that will

assume the role as “Engineer” during the construction of this Work. Third

party inspection firm(s) will also be identified at the pre-construction

meeting.

Q21. It appears that Loudoun Water is providing the VA Special Inspection(s) listed on Dwgs

G4, 5, and 6, including the hiring of the necessary geotechnical and testing agencies,

and that the tank bidder will only need to provide the QA necessary to meet AWWA's

code requirements, correct?

A21. That is correct per the Contract Documents.

Q22. The "Design Criteria Notes" on Drawing G-3 (Sheet 3), Item 12, references an

Allowable Soil Bearing Pressure of only 1500 psf. As with our earlier request for a

copy of the complete Geotechnical Report, please advise how this parameter was

determined (as it appears low for the conditions seen at the site).

A22. Soil bearing capacity is provided based on best available information.

Geotechnical data has been included with the Bidding Documents for

informational purposes only and is not part of the Contract. Per Section 33

16 19, Part 1.03.E of the Contract Documents, the Contractor is to hire his

own Geotechnical Engineer to determine a suitable foundation for the

tank. The Contractor’s Geotechnical Engineer shall complete their own

geotechnical analysis necessary to complete the foundation design. The

Contractor shall submit his/her design for review during construction.

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Q23. Sheet 37, Detail 4, shows a funnel style overflow - we typically prefer a siphon style - is

that acceptable?

A23. A siphon style overflow may be submitted for Loudoun Water

consideration during construction, as the Tank Manufacturer is responsible

for the tank design and shall provide signed and sealed design plans

accordingly (as prepared by an Engineer registered in the Commonwealth

of Virginia). The overflow shall be suitable for a minimum of 2,000 gpm at

6-inches above the TCL of 600 feet.

Q24. Our tank's Anchor Bolts are typically A36 vs the higher strength material(s) listed in the

spec, is that acceptable?


Q25. Finally, as discussed at the pre-bid, please clarify if Loudoun requires a Site Trailer for

its own use (as we normally would not need/provide one for our forces) and that our

Supervision of the work does not need to be a full time employee (i.e. that site

subcontractor(s) can self-supervise, with the tank firm's PM being off-site as usual).


Q26. The marketplace for Steel Plate is currently going thru an upheaval, with normally

stable prices for tank plate going thru the roof in recent weeks. As such we appreciated

hearing that the Board should award the work within 30 days of the bid. Can we expect

a NTP at that same time? If not, how long afterwards will we be released to actually

order steel (and lock down the pricing)? This questions relates to the longer-than-usual

twenty one (21) day Engineering Submittal review period listed in the specs - we would

appreciate consideration of a speedier turn-around of the initial tank design packages.

A26. See Section 00200 Instructions to Bidders, Article 17 Evaluation of Bids and

Award of Contract for the description of the contract award process, and

Section 00700 General Conditions for the description of the NTP timeline.

No changes to the engineer’s submittal review time will be made.

Q27. Please provide a copy of the FAA Determination letter, or advise if they have placed

any special restrictions on both the tank and/or construction crane (i.e. lighting /

marking).


END OF Q&As

[ATTACHMENT NO. 1 INSERTED PER ADDENDUM No. 1]

00410 - Loudoun Water Bid Form

Page i

BID FORM

PROJECT NAME: 600 ZONE WATER STORAGE TANK

LOUDOUN WATER IFB NO.: 2016-001-WTR.00007

TABLE OF CONTENTS

Page

Article 1 – Bid Recipient ................................................................................................................................... 1

Article 2 – Bidder’s Acknowledgements .......................................................................................................... 1

Article 3 – Bidder’s Representations ................................................................................................................ 1

Article 4 – Bidder’s Certification ...................................................................................................................... 2

Article 5 – Basis of Bid ..................................................................................................................................... 3

Article 6 – Time of Completion ........................................................................................................................ 3

Article 7 – Attachments to This Bid ................................................................................................................. 3

Article 8 – Defined Terms ................................................................................................................................. 4

Article 9 – Bid Submittal................................................................................................................................... 5

Bidder's Company Name: ______________________________________________

Virginia Contractor’s License No.: ______________________________________________



Page 1

ARTICLE 1 – BID RECIPIENT

1.01 This Bid is submitted to: Loudoun County Sanitation Authority, d/b/a Loudoun Water

Attention: Engineering Department

P.O. Box 4000

44865 Loudoun Water Way

Ashburn, Virginia, 20146

1.02 The undersigned Bidder proposes and agrees, if this Bid is accepted, to enter into an Agreement

with Owner in the form included in the Bidding Documents to perform all Work as specified or

indicated in the Bidding Documents for the prices and within the times indicated in Bidding

Documents and in accordance with the other terms and conditions of the Bidding Documents.

ARTICLE 2 – BIDDER’S ACKNOWLEDGEMENTS

2.01 Bidder accepts all of the terms and conditions of the Instructions to Bidders, including without

limitation those dealing with the disposition of Bid security. This Bid will remain subject to

acceptance for 60 days after the Bid opening, or for such longer period of time that Bidder may

agree to in writing upon request of Owner.

ARTICLE 3 – BIDDER’S REPRESENTATIONS

3.01 In submitting this Bid, Bidder represents that:

A. Bidder has examined and carefully studied the Bidding Documents, other related data

identified in the Bidding Documents, and the following Addenda, receipt of which is hereby

acknowledged:

Addendum No. Addendum Date

B. Bidder has visited the Site and become familiar with and is satisfied as to the general, local,

and Site conditions that may affect cost, progress, and performance of the Work.

C. Bidder is familiar with and is satisfied as to all Laws and Regulations that may affect cost,

progress, and performance of the Work.

D. Bidder has carefully studied all reports and drawings of Hazardous Environmental Conditions,

if any, at the Site that have been identified in SC-4.06 as containing reliable "technical data."

E. Bidder has considered the information known to Bidder; information commonly known to

contractors doing business in the locality of the Site; information and observations obtained

from visits to the Site; the Bidding Documents; and any Site-related reports and drawings

identified in the Bidding Documents, with respect to the effect of such information,



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observations, and documents on (1) the cost, progress, and performance of the Work; (2) the

means, methods, techniques, sequences, and procedures of construction to be employed by

Bidder, including applying the specific means, methods, techniques, sequences, and procedures

of construction expressly required by the Bidding Documents; and (3) Bidder’s safety

precautions and programs.

F. Based on the information and observations referred to in Paragraph 3.01.E above, Bidder does

not consider that further examinations, investigations, explorations, tests, studies, or data are

necessary for the determination of this Bid for performance of the Work at the price(s) bid and

within the times required, and in accordance with the other terms and conditions of the Bidding

Documents.

G. Bidder is aware of the general nature of work to be performed by Owner and others at the Site

that relates to the Work as indicated in the Bidding Documents.

H. Bidder has given Owner written notice of all conflicts, errors, ambiguities, or discrepancies that

Bidder has discovered in the Bidding Documents, and the written resolution thereof by Owner

is acceptable to Bidder.

I. The Bidding Documents are generally sufficient to indicate and convey understanding of all

terms and conditions for the performance of the Work for which this Bid is submitted.

ARTICLE 4 – BIDDER’S CERTIFICATION

4.01 Bidder certifies that:

A. This Bid is genuine and not made in the interest of or on behalf of any undisclosed individual

or entity and is not submitted in conformity with any collusive agreement or rules of any group,

association, organization, or corporation;

B. Bidder has not directly or indirectly induced or solicited any other Bidder to submit a false or

sham Bid;

C. Bidder has not solicited or induced any individual or entity to refrain from bidding; and

D. Bidder has not engaged in corrupt, fraudulent, collusive, or coercive practices in competing for

the Contract. For the purposes of this Paragraph 4.01.D:

1. “corrupt practice” means the offering, giving, receiving, or soliciting of any thing of value

likely to influence the action of a public official in the bidding process;

2. “fraudulent practice” means an intentional misrepresentation of facts made (a) to influence

the bidding process to the detriment of Owner, (b) to establish bid prices at artificial non-

competitive levels, or (c) to deprive Owner of the benefits of free and open competition;

3. “collusive practice” means a scheme or arrangement between two or more Bidders, with or

without the knowledge of Owner, a purpose of which is to establish bid prices at artificial,

non-competitive levels; and



Page 3

4. “coercive practice” means harming or threatening to harm, directly or indirectly, persons or

their property to influence their participation in the bidding process or affect the execution

of the Contract.

ARTICLE 5 – BASIS OF BID

5.01 Bidder will complete the Work in accordance with the Contract Documents for the following

price(s):

Lump Sum Bid Price $

ARTICLE 6 – TIME OF COMPLETION

6.01 Bidder agrees that the Work will be Substantially Complete and Finally Complete in accordance

with Article 15 of the General Conditions on or before the dates or within the number of calendar

days stated in the Agreement.

6.02 Bidder accepts the provisions of the Agreement as to liquidated damages.

ARTICLE 7 – ATTACHMENTS TO THIS BID

7.01 The following documents are submitted with and made a condition of this Bid:

A. Required Bid security in the form of a Bid Bond or certified check in the amount of 5% of the

Bid Price;

B. Photocopy of Bidder’s Virginia Contractor’s License;

C. Description of at least three successful elevated steel storage tank projects, of the same type

and of equal or greater capacity as specified in the Contract Documents, which the Bidder has

constructed within the past five years. If the elevated storage tank will be constructed by a

Subcontractor to the Bidder, Bidder shall include this information, prepared by the

Subcontractor, with the Bidder’s Bid. Descriptions shall be typed on Bidder’s (or

Subcontractor’s) company letterhead, and each shall include the project owner, owner’s contact

name(s), phone number(s), and email address(es); the engineer, engineer’s contact name(s),

phone number(s) and email address(es); the final contract price; photographs of the tank; a

description of the size (volume) and height of the tank, and the contract time.

D. Description of at least two elevated steel storage tanks, constructed by the Bidder or its

Subcontractor, presently in potable water service, of the same type and of equal capacity or

greater as specified in the Contract Documents, which have been in satisfactory operation for a

minimum of 10 years. Description shall be provided on Bidder’s (or Subcontractor’s)

company letterhead, and shall include the project owners, owners’ contact name and phone

number; photographs of the tanks; and descriptions of the size (volume) and height of tanks.

E. Each Bidder shall submit with his bid a design sketch of the tank, supporting structure and

proposed foundation to be furnished:



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1. Show all major dimensions of the tank, supporting structure and foundation including but

not limited to tank diameter, riser (pedestal) wall thickness and diameter, the height to the

bottom and top capacity levels, the thickness of the principal plates in the tank, and details

of the tank foundation.

ARTICLE 8 – DEFINED TERMS

8.01 The terms used in this Bid with initial capital letters have the meanings stated in the Instructions to

Bidders, the General Conditions, and the Supplementary Conditions.



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ARTICLE 9 – BID SUBMITTAL

9.01 This Bid is submitted by:

If Bidder is:

An Individual

Name (typed or printed):

By:

(Individual’s signature)

Doing business as:

A Partnership

Partnership Name:

By:

(Signature of general partner -- attach evidence of authority to sign)


A Corporation

Corporation Name:

State of Incorporation:

Type (General Business, Professional, Service, Limited Liability):_______

By:

(Signature -- attach evidence of authority to sign)


Title:

(CORPORATE SEAL)

Attest

Date of Qualification to do business in Virginia is ____/____/____.



Page 6

A Joint Venture

Name of Joint Venture:

First Joint Venturer Name: (SEAL)

By:

(Signature of first joint venture partner -- attach evidence of authority to sign)


Title:

Second Joint Venturer Name: (SEAL)

By:

(Signature of second joint venture partner -- attach evidence of authority to sign)


Title:

(Each joint venturer must sign. The manner of signing for each individual, partnership, and

corporation that is a party to the joint venture should be in the manner indicated above.)

SUBMITTED on , 20 .

END OF BID FORM

Bidder's Business

Address: _____________________________________________________________

Federal Employer Identification No.: ______________________________________________

Phone No.: ____________________________ Fax No.: __________________________

Bidder’s contact person: _______________________________________________________

E-mail address: _______________________________________________________


Loudoun Water

00800 - Supplementary Conditions

Page 1 of 6

SUPPLEMENTARY CONDITIONS

TABLE OF CONTENTS

Page

SC- 1.01 Defined Terms .............................................................................................................. 2

SC- 4.05 Reference Points ........................................................................................................... 2

SC- 4.06 Hazardous Environmental Conditions at the Site ......................................................... 2

SC- 5.04 Contractor’s Insurance .................................................................................................. 3

SC- 6.01 Independent Contractor; Supervision and Superintendence ......................................... 3

SC- 6.02 Labor; Working Hours .................................................................................................. 3

SC- 6.08 Permits .......................................................................................................................... 4

SC- 6.11 Use of Site and Other Areas.......................................................................................... 4

SC- 9.01 General Duties .............................................................................................................. 4

SC- 11.01 Cost of the Work ........................................................................................................... 4

SC- 12.06 Delays ........................................................................................................................... 5

SC- 18.01 Giving Notice ................................................................................................................ 5

Appendix 1 FAA Aeronautical Study No. 2014-AEA-49-OE………………………..........6

Loudoun Water Use Only

Version: July 2015


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SUPPLEMENTARY CONDITIONS

PREFACE

These Supplementary Conditions amend or supplement the General Conditions of the

Construction Contract. All provisions which are not so amended or supplemented remain in full

force and effect.

The terms used in these Supplementary Conditions have the meanings stated in the General

Conditions, unless modified or redefined herein. Additional terms used in these Supplementary

Conditions have the meanings stated below, which are applicable to both the singular and plural

thereof.

The address system used in these Supplementary Conditions is the same as the address system

used in the General Conditions, with the prefix "SC" added thereto.

SC-1.01 Defined Terms

In GC 1.01.A, incorporate the following changes:

23. Engineer-The Project was designed by CH2M Hill. CH2M Hill’s role in the Project

during construction is undetermined at the time of the Bid. At the preconstruction

conference, the Owner will identify the engineering firm that will assume the role

“Engineer” during construction.

SC-4.05 Reference Points

DELETE Paragraphs 4.05.A in its entirety and insert the following:

A. The Project is referenced to the following datums as indicated on the Drawings:

1. Horizontal: NAD 83 Virginia State Plane North Zone

2. Vertical: NAVD 88

B. The Contractor shall contact the Engineer to request the electronic files necessary for

laying out the Work.

C. Contractor shall be responsible for laying out the Work, shall protect and preserve the

established reference points and property monuments, and shall make no changes or

relocations without the prior written approval of Owner. Contractor shall report to

Owner whenever any reference point or property monument is lost or destroyed or

requires relocation because of necessary changes in grades or locations, and shall be

responsible for the accurate replacement or relocation of such reference points or

property monuments by professionally qualified personnel.

SC-4.06 Hazardous Environmental Conditions at the Site

DELETE Paragraphs 4.06.A and 4.06.B in their entirety and insert the following:

A. No reports or drawings related to Hazardous Environmental Conditions at the Site

are known to Owner.


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SC-5.04 Contractor’s Insurance

The limits of liability for the insurance referenced by Paragraph 5.04.B.2 of the General

Conditions shall be not less than the following amounts or greater where required by Laws and

Regulations:

Coverage Amount

Workers’ Compensation: Statutory

Employers’ Liability: $1,000,000 each person

Commercial General Liability: $1,000,000 each occurrence

→with a combined single limit of: $2,000,000 annual aggregate

Commercial Automobile Liability : $1,000,000 each occurrence

→with a combined single limit of: $2,000,000 annual aggregate

Excess Liability Insurance, combined single

limit of:

$6,000,000 each occurrence

$6,000,000 annual aggregate

SC-6.01 Independent Contractor; Supervision and Superintendence

The following information supplements the General Conditions, but does not replace the

information contained therein:

C. Regarding Superintendence: Contractor shall have an individual in responsible charge

on the Site at all times during the progress of the Work.

SC-6.02 Labor; Working Hours

The following information supplements the General Conditions but does not replace the

information contained therein.

C. Regarding regular working hours:

1. Regular working hours are defined as 7:00 AM to 4:00 PM working days.

2. If the Contractor desires to perform Work outside regular working hours,

Contractor shall provide its Notice requesting permission to Work outside regular

working hours to Owner three business days in advance of the Work.

3. For Work performed outside regular working hours, the hourly rate charged to the

Contractor for inspection services shall be $100/hr-inspector.

4. By providing Notice to Owner requesting permission to perform Work outside

regular working hours pursuant to SC-18.01, Contractor agrees to be invoiced

separately for the cost of inspection services. Any amount due to Owner for

inspection services that is not paid within 30 days of the date of the invoice shall

be deducted from moneys otherwise due the Contractor.


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SC-6.08 Permits

ADD the following Paragraph 6.08.B:

B. Owner has obtained or will obtain the following permits:

1. Loudoun County Building Permit – A foundation (Only) Building Permit will be

provided to the Contractor by the Owner by Notice to Proceed. Contractor will be

responsible for submitting a Building Permit Application to Loudoun County for

the structural review of the tank. Loudoun County will merge the two permits into

one once the second application has been approved. Contractor shall obtain

necessary trade permits required for the Project. The Department of Building and

Development has indicated that all fees associated with the building permit for the

Project will be waived.

2. Loudoun County Grading Permit – A copy of the permit will be provided by the

Loudoun County Inspector at an Erosion and Sediment Control pre-construction

meeting that must be scheduled by the Contractor with Loudoun County prior to

the start of Work. Contractor shall comply with the terms of the permit and shall

be responsible for obtaining release of the permit from Loudoun County prior to

Final Payment.

3. VSMP Permit (Virginia Stormwater Management Program VPDES Construction

General Permit VAR10) - A copy of the permit and SWPPP will be provided to

the Contractor by the Owner by Notice to Proceed, which shall be maintained on

the Sire at all times during the Project. Contractor shall comply with the terms of

the permit and shall be responsible for maintaining the SWPPP current.

4. Virginia Department of Health Certificate to Construct (CTC) - This permit will

be provided to the Contractor by the Owner by Notice to Proceed.

SC-6.11 Use of Site and Other Areas

F. Restoration. Contractor shall restore to original condition all property not designated

for alteration by the Contract Documents. This restoration requirement includes, but

is not limited to, establishing permanent vegetation, replacing existing landscaping

features and sidewalk, and removal of erosion control measures.

SC-9.01 General Duties

The Engineer shall serve as Owner’s representative in performing the following

activities, which are further defined in Paragraph 9.01 of the General Conditions: periodic

site visits, tests and inspections, rejecting defective Work, reviews, payment applications,

claims, meetings, communications, and interpretation and clarification.

SC-11.01 Cost of the Work

ADD the following to Paragraph 11.01-A.5.a.:

Costs will be determined using the established FHWA rates adjusted for geographic

region and equipment model year.


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ADD the following Paragraph 11.01-A.5.g.:

g. Equipment not in good operating condition, or larger than required, may be rejected

by the Owner or accepted at reduced rates.

ADD the following Paragraph 11.01-A.5.h.:

h. If an equipment rate has not been established by the Rental Rate Blue Book, the

Contractor may:

1. Use the rate of the most similar model found, considering such characteristics

as manufacturer, capacity, horsepower, age, fuel type, etc. Similar models are

subject to approval by the Owner.

2. Request Equipment Watch to furnish a written response for a rate on the

equipment, which shall be presented to the Owner for approval.

SC-12.06 Delays

ADD the following paragraphs to GC-12.06:

G. The Contractor shall be entitled to an extension of time for such causes only for the

number of days of delay which the Owner may determine to be due solely to such

causes and then only to the extent that such occurrences actually delay the Substantial

Completion or Final Completion of the Project, or defined portions thereof. If the

delay is not solely due to such causes but also is due concurrently to causes for which

the Contractor is not entitled to an extension of time, the Contractor shall not be

entitle to an extension of time for such period of concurrent delay.

H. No extension of time will be granted to the Contractor for delays occurring to parts of

the Work if such delays have no measurable impact on the completion of the total

Work under the Contract; nor will an extension of time be granted for delays to parts

of the Work that are not located on the Project’s critical path.

I. Delays in the delivery of Equipment or material purchased by the Contractor or its

Subcontractors, or in the submission of required Shop Drawings or submittals by the

Contractor’s or its Subcontractor’s materialmen, manufacturers, or suppliers, or in the

performance of any of the Contractor’s Subcontractors or caused by the performance

of any of the Contractor’s Subcontractors, shall not be considered as a just cause for

an extension of time. Except for Owner-furnished equipment, the Contractor shall be

fully responsible for the timely submission, ordering, scheduling, expediting,

fabrication, delivery and installation of all Equipment, materials, and Shop Drawings

or submittals.

SC-18.01 Giving Notice

DELETE paragraph 18.01.A and INSERT the following Paragraphs:

A. Notices may be given by email to the Owner’s project manager except for Notices

required by Articles 12, 16, and 17 of the General Conditions.


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B. All Notices required of Contractor under Articles 12, 16, and 17 shall be given

electronically through email and as a hard copy hand delivered or sent via registered

or certified mail postage prepaid to the Project Manager and the Manager of Capital

Construction. Until changed by a party (by giving Notice of the change), the

addresses for Notices to the Owner and Contractor are as set forth in the Agreement.

C. For Notice requesting permission to perform Work outside regular working hours,

Contractor shall complete the online request form, which can be found at the

following internet address:

http://www.loudounwater.org/content/request-overtime-inspections-form

In the box for “Development Company Name”, Contractor shall type in its

company’s name.

Appendix 1 FAA Aeronautical Study No. 2014-AEA-49-OE

Attached and hereby made part of the Supplementary Conditions.

END OF SUPPLEMENTARY CONDITIONS

Attachments:

1. Notice of Intent to Claim form

2. Notice of Claim form

3. Application for Payment Form



600 ZONE WATER STORAGE TANK


[INSERTED PER ADDENDUM No. 1]

SUBMERSIBLE MIXER

40 00 00-1

SECTION 40 00 00

SUBMERSIBLE MIXER

1. PART 1 – GENERAL

1.01 THE REQUIREMENT

A. The Contractor shall furnish, install and place in satisfactory operation a submersible tank mixing

system together with control, accessories, fasteners, wiring and conduits and other appurtenances

as necessary for a complete and operable system.

B. Equipment shall be provided in accordance with the requirements of Section 11000 – Equipment

General Provisions.

C. The submersible mixer shall be factory preassembled, factory prewired, and factory tested.

Contractor shall provide copies of all factory tests. Field wiring connections shall terminate on

GFCI-protected disconnect switch in accordance with Division 16.

1.02 RELATED WORK SPECIFIED ELSEWHERE

A. Section 01 33 00 - Submittals

B. Division 26 – Electrical

1.05 SUBMITTALS

A. The Shop Drawings shall be submitted for Owner and Engineer review prior to purchase and

installation of submersible mixing system.

B. The Shop Drawings shall be submitted in accordance with Section 01 33 00 – Submittals.

C. Include in each shop drawing NSF-61 Certification of the submersible mixing system to be

installed in the water storage tank.

D. Design Calculations

1. Based on models validated and/or calibrated with experimental data from laboratory-scale

and real scale representative systems for similarly-sized storage facilities, manufacturer

shall provide documentation of completely mixed conditions for equipment configuration.

The manufacturer shall provide documentation of the Computational Fluid Dynamics

(CFD) model parameters and assumptions, tank geometry and dimensions considered,

mesh information, and CPU time required.

2. Analysis shall include the following sections:

a. Velocity vectors and contour plot at different cross-sections.

b. The average flow induced throughout the tank.

c. The corresponding average turnover for the tank (in hours).




SUBMERSIBLE MIXER

40 00 00-2

d. The corresponding average power consumption of the mixer.

3. Calculations shall be signed and sealed by a Professional Engineer registered in the

Commonwealth of Virginia.

E. Operations, and Maintenance Manuals shall be in accordance with Section 01 33 00 – Submittals,

Part 1.06 Operation and Maintenance Manuals.

1.06 QUALITY ASSURANCE

A. The mixing system shall be tested prior to deployment according to standard engineering practices

at the factory testing facilities. Certification of this completed testing shall accompany mixer

installation documentation.

B. Manufacturer shall have five (5) mixer system installations of equal to or greater size, each with a

minimum of three (3) years of operation.

1.07 PROTECTION OF EQUIPMENT

A. All equipment shall be boxed, crated, or otherwise protected from damage and moisture during

shipment and handling.

B. Vendor shall notify Contractor of any specific storage conditions or requirements prior to shipping.

PART 2 -- PRODUCTS

2.01 ACCEPTABLE MANUFACTURER

A. The submersible mixer shall be the PAX Mixer as manufactured by PAX Water Technologies, or

equal.

2.02 DESIGN REQUIREMENTS

A. The submersible mixing system shall have the ability to function continuously on a year-round

basis. The mixer shall consist of a low-voltage, submersible motor, an impeller and a non-

submersible control center that houses all control electronics. The impeller and submersible motor

shall be supported approximately three feet in height from the tank floor in order for it to launch a

jet of water from the bottom of the tank up toward the surface of the water. Floating devices are

not acceptable. Mixer duty cycle shall be variable with the size and volume of the tank. Mixer

control and operation shall be independent of tank drain and fill cycles to ensure constant mixing.

Both wet-side and dry-side shall be able to be hoisted, installed, and/or removed by on-site

personnel without additional equipment needed, and so that weight of mixer on tank floor does not

cause damage to interior coating.

B. Mixing system shall completely mix the water in the 1 million gallons water storage tank

according to the following minimum performance requirements. These requirements shall be

measured and validated after installation by the manufacturer.




SUBMERSIBLE MIXER

40 00 00-3

1. Temperature Uniformity: All temperatures shall converge to within 1.0°C within 48 hours

after mixer is installed and activated. During continuous operation of the mixer, all

temperatures will converge to within 1.0°C at least once every 24 hours.

2. Disinfectant Residual Uniformity: Disinfectant residual within top five feet of tank and

bottom five feet of tank will converge to within 0.20 ppm within 5 days after mixer is

installed and activated. During continuous operation of the mixer, disinfectant residual will

converge to within 0.20 ppm at least once every 72 hours.

C. Power source for mixer shall be 110VAC.

2.02 MATERIALS – WET-SIDE

A. Each component shall be NSF/ANSI Standard 61 certified.

B. Impeller

1. The impeller shall be a precision casting of AISI Type 316 stainless steel and passivated

per ASTM A380 to minimize corrosion.

2. The impeller shall be specifically designed for the application intended and be dynamically

and hydraulically balanced to within 0.5 gram-inches.

3. The impeller shall be streamlined to prevent cavitation at any rotational speed up to 1500

RPM.

C. Motor

1. Motor shall be sized so that at no time during any operating condition shall the torque

required by the mixer exceed that available continuously from the motor. The rubber seals

shall provide resistance to chlorine and chloramines. The motor shall be a wet type motor

with water tight insulated windings. Motor shall be rated for a maximum of 0.5 HP at

between 500-1200 RPM.

a. AISI Type 304 Stainless Steel body

b. Chlorine/Chloramine resistant rubber seals

c. Fully submersible

d. Low power (0.5 HP maximum)

e. Water-filled motor

f. Water-lubricated motor

D. Mixer Mounting Base

1. The mixer mounting base shall be designed to be placed on the bottom of the water storage

tank with no modification to the tank and no anchorage.

2. Contractor shall coordinate the bottom tank surface profile with the manufacturer to ensure

that the mixer system is installed properly.




SUBMERSIBLE MIXER

40 00 00-4

3. The motor and impeller shall be mounted onto a tripod constructed of AISI Type 316

stainless steel.

4. The bottom of the support legs shall be covered with non-skid, non-scratch NSF/ANSI

Standard 61 certified EPDM rubber.

5. Built-in attachments shall be provided to secure motor cable away from the impeller.

6. The weight of the mixer mounting base including the motor and impeller shall not exceed

75-lbs.

7. The overall height of the unit shall not exceed four (4) feet.

2.03 MATERIALS – DRY-SIDE (Motor Control Panel)

A. Motor starters and controls for the mixer shall be provided in a NEMA 3R (gasketed) enclosure

with hinged access cover. Power cable between the mixers and the control panel shall be

furnished by the mixer supplier. The control panel shall include, but not be limited to, the

following:

1. A single pole main circuit breaker.

2. A power supply rated to accept a single phase, 120VAC input, 12A (max.) output. Power

supply shall contain automatic thermal shutoff protection.

3. Motor controller shall contain thermal shut-off protection, current overload protection,

incoming AC line fuses, motor field-supply output fuses, and cage-clamp terminals.

Motor controller shall be DC3E as manufactured by Reliance Electric or equal.

4. The motor control panel shall contain the following devices face mounted to the front of

the enclosure.

i) Red “running” pilot light

ii) Green “Power On” pilot light

All pilot lights and devices shall be 30.5 mm type.

5 Provide “run” and “fail” dry contacts signals back to the PLC for indication.

6. Control panel shall accept “Start” and “Stop” commands from the PLC. Discrete

outputs shall be 120 VAC powered (sourced) from the PLC.

7. The mixer speed shall be determined based on the speed potentiometer setting at the

motor controller. Automatically-activated motor shall shut-off if water level drops below

motor height in tank.

B. Motor Controller/VFD:

Rated to 1.0 HP

Operating temperature range -30°C up to 50°C (-34°F to 122°F)




SUBMERSIBLE MIXER

40 00 00-5

Manual speed control (potentiometer)

Thermal shut-off protection built-in

Current overload protection built-in

SCADA outputs included:

Digital Output signal indicating motor running

Digital Output signal indicating fault

Digital Input/output signal allowing remote motor on/off

RS-232 (MODBUS) or RS-485 or Dry Contact connections

C. GFCI-protection

120-volt, 60-Hz, single-phase GFCI included inside control center

40-Amp, 300mA trip level

2.06 CONDUIT

A. Contractor shall provide conduit from control center to tank penetration for submersible motor

cable and penetration through tank for same cable.

PART 3 – EXECUTION

3.01 INSTALLATION

A. Contractor shall coordinate the location and installation of the submersible mixer with the mixer

manufacturer.

B. Contractor shall ensure that the installation of the submersible mixing system will not scratch or

otherwise cause damage to internal tank coating or put undue stress on the materials of the tank

construction. The submersible mixing system and the associated equipment and tools shall fit

through a two-foot diameter hatch.

C. Control and power cable shall be fed through the access tube via water tight bulk head fitting as

manufactured by Cooper Crouse-Hinds or equal.

1. Fitting shall prevent moisture intrusion into access tube and be horizontally oriented.

2. Fitting shall be installed minimum two feet above overflow elevation.

3. Fitting shall be 1 inch diameter fitting to allow cable to pass through.

4. Strain relief for power cable shall be part of the contractor-supplied fitting for tank.

D. The mixer and control center shall be installed in accordance with approved procedures submitted

and as shown, unless otherwise approved in writing from the Factory.

3.02 MANUFACTURER’S FIELD SERVICES




SUBMERSIBLE MIXER

40 00 00-6

A. Provide necessary assistance and instruction for installation and adjustment of equipment to the

satisfaction of the manufacturer.

B. Submit written certification jointly to the Owner, the Engineer, and the Contractor that the equipment

supplied or manufactured by their organization has been installed and tested to their satisfaction, and

that all final adjustments thereto have been made. Certification shall include date of final acceptance

field test, as well as a listing of all persons present during tests.

3.03 FIELD TESTING

A. The submersible mixer shall be field tested with the water storage tank full to the maximum water

surface elevation.

B. After field tests are successfully completed as determined by the Engineer, the Contractor shall

operate the submersible mixer over the full range of water levels in the water storage tank for a

continuous period of not less than 48 hours. The Contractor shall correct and resolve all operating

problems, deficiencies, etc., determined as a result of the tests.

- END OF SECTION -

Section 00800

Supplementary Conditions

Appendix 1

FAA -2014 DETERMINATION OF NO HAZARD TO AIR NAVIGATION AND

EXTENSION

ATTACHMENT NO. 4 INSERTED PER ADDENDUM NO. 1

Mail Processing CenterFederal Aviation AdministrationSouthwest Regional OfficeObstruction Evaluation Group2601 Meacham BoulevardFort Worth, TX 76193

Aeronautical Study No.2014-AEA-49-OE

Page 1 of 1

Issued Date: 07/29/2015

Karen ArnoldLoudoun Water44865 Loudoun Water WayPO Box 4000Ashburn, VA 20146

** Extension **

A Determination was issued by the Federal Aviation Administration (FAA) concerning:

Structure: Water Tank Loudoun Water 600 Zone Water Storage TanksLocation: Leesburg, VALatitude: 38-59-07.00N NAD 83Longitude: 77-34-39.00WHeights: 431 feet site elevation (SE)

200 feet above ground level (AGL)631 feet above mean sea level (AMSL)

In response to your request for an extension of the effective period of the determination, the FAA has reviewedthe aeronautical study in light of current aeronautical operations in the area of the structure and finds that nosignificant aeronautical changes have occurred which would alter the determination issued for this structure.

Accordingly, pursuant to the authority delegated to me, the effective period of the determination issued underthe above cited aeronautical study number is hereby extended and will expire on 01/29/2017 unless otherwiseextended, revised, or terminated by this office. You must adhere to all conditions identified in the originaldetermination.

This extension issued in accordance with 49 U.S.C., Section 44718 and, if applicable, Title 14 of the Codeof Federal Regulations, part 77, concerns the effect of the structure on the safe and efficient use of navigableairspace by aircraft and does not relieve the sponsor of compliance responsibilities relating to any law,ordinance, or regulation of any Federal, State, or local government body.

If we can be of further assistance, please contact our office at (817) 321-7755. On any future correspondenceconcerning this matter, please refer to Aeronautical Study Number 2014-AEA-49-OE.

Signature Control No: 204891405-259018875 ( EXT )Debbie CardenasTechnician
