C-05_AMD_04_W912DR18B0002-0004.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83)

Prescribed by GSA

FAR (48 CFR) 53.243

NORTH CLEARWELL MAINTENANCE IMPROVEMENTS, WASHINGTON AQUEDUCT DIVISION, WASHINGTON, DC

The purpose of this amendment is to incorporate the follow ing:

1)Extend the proposal due date to 10:00AM, EST, 8 JANUARY 2018

2)Issue revised Price Schedule - see attachment

3)Issue changes to Specif ications as listed - see follow ing pages

4)Issue revised Draw ing Package - see attachment

5)Issue Questions and Answ ers to RFI Questions #34-#110 - see follow ing pages

6)All other terms and conditions remain unchanged.

1. CONTRACT ID CODE PAGE OF PAGES

1 16

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY 27-Dec-2017

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912DR18B0002

X 9B. DATED (SEE ITEM 11)

01-Dec-2017

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer X is extended, is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE

RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

27-Dec-2017

CODE

USACE, BALTIMORE DISTRICT

10 S. HOWARD ST

ROOM 7000

BALTIMORE MD 21201

W912DR 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W912DR18B0002

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION 00 10 00 - SOLICITATION

The required response date/time has changed from 03-Jan-2018 10:00 AM to 08-Jan-2018 10:00 AM.

SECTION 00 21 13 - INSTRUCTIONS TO BIDDERS

The following have been added by full text:

AMENDMENT 0004

SOLICITATION:

1. Contractor bid proposal due date extended to 10:00 AM EST, January 8, 2018.

2. SECTION 00010 – PRICE SCHEDULE: Delete the previously issued Unit Price Schedule and substitute the attached revised Unit Price Schedule, dated December 22, 2017.

SPECIFICATIONS:

3. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 1, PART 1.1.b.1:

Paragraph to be modified to state:

“Base Bid – The construction duration for base bid items is 365 calendar days after Notice to

Proceed. Major components of the Work included in this option consist assisting the Owner

O&M Staff in isolating and dewatering the South Clearwell and 78-inch outlet pipe. The

Contractor will then proceed with demolition of the existing 78-inch butterfly valve in the

South Clearwell outlet chamber, and installation of the following in the South Clearwell outlet chamber: 78-inch wafer style static mixer, 78-inch steel pipe spool piece, 78-inch butterfly valve, and new chemical feed lines. Sluice gates 6-41 and 6-44 are to be replaced, sluice gate

6-43 is to be abandoned, and a modified hatch cover is to be placed over the gate chamber while the South Clearwell is out of service. The South Clearwell meter vault is to be waterproofed prior to the recommissioning of the South Clearwell.

Following the refilling of the South Clearwell, the Owner will conduct a 30-day operational test of the facilities to ensure proper performance. Thirty (30) calendar days after Substantial

Completion of the South Clearwell work and satisfactory testing of the static mixer, the North

Clearwell will be decommissioned. Major components of the Work included in the North

Clearwell consist of assisting the Owner O&M Staff with isolating and dewatering the North

Clearwell and 78-inch South Clearwell Bypass. The Contractor will then proceed with the demolition of sluice gate 6-37, removal of chemical feed piping, installation of an insert wafer style static mixer in the 78-inch South Clearwell Bypass, replacement of sluice gate 6-37, installation of new chemical feed piping and new Accusonic wiring, and maintenance of sluice gate 6-50 to reduce leakage. The Owner will allow the Contractor 72 hours to isolate the gate valve vault in order to demolish and replace sluice gate 6-42 and chemical feed pipe before the recommissioning of the North Clearwell. This work will require close coordination with the

Owner and must proceed around the clock, if required, to facilitate disinfection and the recommissioning of the North Clearwell Sluice Gate Chamber within the 72-hour period.

Within the contracted time, the backwash check valve assembly and the pipe and valve replacement within vault 6-52 are to take place. These activities are not sequenced as they can occur at anytime with proper coordination with the Owner.”

4. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 2, PART 1.1.b.2:

Paragraph to be modified to state:

“Base Bid plus Optional Items - An additional 365 days of construction duration will be permitted for optional bid items. Major components of the Work included in this option consist assisting the Owner O&M Staff in isolating and dewatering the South Clearwell and 78-inch outlet pipe. The Contractor will then proceed with demolition of the existing 78-inch butterfly valve in the South Clearwell outlet chamber, and installation of the following in the South

Clearwell outlet chamber: 78-inch wafer style static mixer, 78-inch steel pipe spool piece, 78-inch butterfly valve, and new chemical feed lines. Sluice gates 6-41 and 6-44 are to be replaced, sluice gate 6-43 is to be abandoned, and a modified hatch cover is to be placed over the gate chamber while the South Clearwell is out of service. The South Clearwell meter vault is to be waterproofed prior to the recommissioning of the South Clearwell.

Following the refilling of the South Clearwell, the Owner will conduct a 30-day operational test of the facilities to ensure proper performance. Thirty (30) calendar days after Substantial

Completion of the South Clearwell work and satisfactory testing of the static mixer, the North

Clearwell will be decommissioned. Major components of the Work included in the North

Clearwell consist of assisting the Owner O&M Staff with isolating and dewatering the North

Clearwell and 78-inch South Clearwell Bypass. The Contractor will then proceed with the demolition of sluice gate 6-37, removal of chemical feed piping, installation of an insert wafer style static mixer in the 78-inch South Clearwell Bypass, replacement of sluice gate 6-37, installation of new chemical feed piping and new Accusonic wiring, and maintenance of sluice gate 6-50 to reduce leakage. The Owner will allow the Contractor 72 hours to isolate the gate valve vault in order to demolish and replace sluice gate 6-42 and chemical feed pipe before the recommissioning of the North Clearwell. This work will require close coordination with the

Owner and must proceed around the clock, if required, to facilitate disinfection and the recommissioning of the North Clearwell Sluice Gate Chamber within the 72-hour period.

The Contractor will then proceed to place the reinforced concrete slab over the North Clearwell existing roof. Once the reinforced concrete slab placement is complete and the roof is secured, the Contractor shall proceed with the interior work, including: leak and structural repairs, abandonment of the existing unused pipes, demolition of the existing baffle walls, and installation of a new FRP baffle wall system.

Within the contracted time, the backwash check valve assembly and the pipe and valve replacement within vault 6-52 are to take place. These activities are not sequenced as they can occur at anytime with proper coordination with the Owner.”

5. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 3, PART 1.1.d:

Paragraph to be modified to state:

“Prior to the 30 day operational period, all facilities and equipment shall be tested, disinfected where required (including disposal of water), and shall be fully capable of producing drinking water in compliance with all Laws and Regulations. The Contractor shall coordinate closely with the Owner in regards to the initial cleaning, flushing, and disinfection of the facilities.

The Owner will handle the dewatering and disinfection of the facilities.”

6. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 3, PART 1.1.e:

Paragraph to be modified to state:

“The Contractor is permitted to dispose of water not contaminated with ammonia, chlorine, or

VOCs into the stormwater system. Water contaminated with ammonia or chlorine shall be disposed of into the sanitary sewer system. Water contaminated with VOCs will require removal and disposal at a facility designed to handle VOCs. Capacity is limited, however, and its use shall be coordinated with the Owner. The Contractor shall obtain all necessary permits and pay all costs associated with disposal of additional quantities of water and wastewater during testing and start-up above what can be handled by the stormwater and sanitary sewer system.”

7. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 7, PART

1.5.b.3.d: Paragraph to be deleted.

8. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 8, PART

1.5.c.1.f: Paragraph to be deleted.

9. SECTION 01 92 10 – MAINTENANCE OF PLANT OPERATIONS, PAGE 8, PART 1.6.c.2:

South Clearwell shutdown period modified to 4 calendar weeks.

10. SECTION 03 01 35 – CONCRETE REPAIRS, PAGE 5, PART 3.1, PARAGRAPH 2:

Sentence modified to state:

“Waterblast (3000-4000 psi waterjet) deteriorated areas to remove all loose concrete, existing coatings, unsound material, debris, and laitance…”

11. SECTION 06 72 11 – FIBERGLASS REINFORCED PLASTIC (FRP) BAFFLE WALL,

PAGE 2, PART 2.1, PARAGRAPH 1: “Baffle Roof System” to be changed to state “Baffle

Wall System”

12. SECTION 06 72 11 – FIBERGLASS REINFORCED PLASTIC (FRP) BAFFLE WALL,

PAGE 3, PART 2.1: Sentence that states “This area is reserved for instructions of what samples are to be provided in the event that the client desires” to be deleted.

13. SECTION 08 11 13 – STEEL DOORS AND FRAMES: Remove Specification Section in its entirety.

14. SECTION 08 34 59 – VAULT DOORS AND DAY GATES: Remove Specification Section in its entirety.

15. SECTION 09 06 00 – SCHEDULES FOR FINISHES: Remove Specification Section in its entirety.

16. SECTION 32 01 16.71 – COLD MILLING ASPHALT PAVING, PAGE 1, PART 1.1:

Paragraph to be deleted.

17. SECTION 32 12 13 – BITUMINOUS TACK AND PRIME COATS, PAGE 1, PART 1.1:

Paragraph to be deleted.

DRAWINGS:

18. SHEET E-02: Note 15 modified to state:

“Replace wiring and 16 transducers between the existing flow meter console located at grade and existing accusonic flow meter transducers located approximately 20 feet below grade.

Existing transducers are model 7630 transducers. For wiring, existing conduit shall be reused and 32 HDPE RG-59 transducer cables with standard RG-59 pigtail to EO connectors shall be installed. Replacement of wiring and transducer work shall be performed by an authorized accusonic technician.”

19. SHEET S-01: Note L-1 modified to state:

“…This value equates to 18” of soil and a 100 PSF live load…”

20. SHEET S-03: Note 5 modified to state:

“Baffle wall system column spacing may vary based on manufacturer.”

21. SHEET S-03A: Note 5 modified to state:

“Baffle wall system column spacing may vary based on manufacturer.”

22. SHEET S-04: Label for existing access manhole modified to state:

“Existing access manhole to remain (TYP), see section 5/S-10 for additional details.”

23. SHEET S-05: Label for existing access manhole modified to state:

“Existing access manhole to remain (TYP), see section 5/S-10 for additional details.”

24. SHEET S-05: Label for existing perimeter wall added:

“Limits of elevated slab perimeter wall.”

25. SHEET S-05A: Label for existing access manhole modified to state:

“Existing access manhole to remain (TYP), see section 5/S-10 for additional details.”

26. SHEET S-05A: Label for existing perimeter wall added:

“Limits of elevated slab perimeter wall.”

27. SHEET S-10: Note 3 has been removed.

28. SHEET S-10: Note 8 has been added:

“Actual height of new perimeter wall will be governed by height of existing repair section where it connects to side wall. Max height shown in section 2/S-10”

29. SHEET S-20: Concrete Repair Schedule has been modified to refer to appropriate details and to match with Price Schedule line items.

30. SHEET S-20: Label for sealing a nonleaking crack per Detail 1/S-20 has been modified to state:

“Patch void flush with epoxy crack binder, see specification 03 01 35”

31. SHEET S-20: Detail 4/S-20 has been modified to include repair options with and without waterproof injection grout.

32. SHEET S-20: Note 4 has been modified to state:

“Before commencement of any concrete repair work contractor shall waterblast deteriorated areas to remove residual lime sediment deposit and biofilm from interior wall surfaces as directed by the Government. See specification 03 01 35.”

33. SHEET S-20: Note 5 has been modified to state:

“All sediment and washwater removed during cleaning operations shall be contained, collected, and properly disposed of by contractor.”

34. SHEET S-21: Detail 3/S-21 has been modified to include repair options with and without waterproof injection grout.

35. SHEET S-20: Note 1 has been modified to state:

“Spalled and/or deteriorated areas where depth “D” to be repaired is less than or equal to 6” shall be repaired per Detail 1/S-21. Areas where depth “D” is greater than 6” shall be repaired per Detail 2/S-21.”

ATTACHMENTS:

1) Revised Price Schedule, dated December 22, 2017

2) Revised Section 01 92 10, dated December 22, 2017

3) Revised Section 06 72 11, dated December 22, 2017

4) Revised Section 32 01 16.71, dated December 22, 2017

5) Revised Section 32 12 13, dated December 22, 2017

6) Revised Sheet E-02, dated December 22, 2017

7) Revised Sheet S-01, dated December 22, 2017

8) Revised Sheet S-03 and S-03A, dated December 22, 2017

9) Revised Sheet S-04, dated December 22, 2017

10) Revised Sheet S-05 and S-05A, dated December 22, 2017

11) Revised Sheet S-10, dated December 22, 2017

12) Revised Sheet S-20, dated December 22, 2017

13) Revised Sheet S-21, dated December 22, 2017

QUESTIONS AND ANSWERS

FOR INFORMATION ONLY (FIO)

NORTH CLEARWELL MAINTENANCE AND IMPROVEMENTS

WASHINGTON AQUEDUCT, WASHINGTON, D.C.

W912DR-18-B-0002

DECEMBER 27, 2017

Question No. 34: Sheet S-05 and 06 indicate note 4 and 5 for access manhole. Please refer the correct notes and provide note 5 for the same.

Answer No. 34: Published in Amendment 0004. The label for access manhole has been revised.

Refer to revised Sheet S-04. References to Notes 4 and 5 on Sheets S-05 and S-05A have been removed. Refer to revised Sheets S-05 and S-05A.

Question No. 35: Please advise if and where the plumbing specification 22 00 00 is applicable?

Answer No. 35: Published in Amendment 0003. Disregard Section 22 00 00 Plumbing, General

Purpose.

Question No. 36: Contract drawing M-10 shows the demolition of an existing 78” butterfly valve located in the South Clearwell Effluent Chamber. Drawing M-11 shows the installation of a new

78” butterfly valve as well as a 78” spool pipe manifold and static mixer plate. Due to the large size of these items it not possible to remove the existing valve and install the new valve, pipe manifold, and mixer plate through the existing access hatch without demolishing the existing building roof. Where is the closest access point into the South Clearwell? Additionally, what is the size of the opening? Due to the large weight of these items, a piece of operated equipment will potentially be needed to convey the large pieces from the sump pit to the access point. What are the surface conditions inside the South Clearwell? If the surface is rough, and there are existing curbs and other obstructions, temporary ramps will be needed.

Answer No. 36: The removal of the existing roof above the South Clearwell outlet chamber will not be necessary. There are two 12’-8”x8’-8” access openings on the South Clearwell roof. The closest access opening is approximately 240 feet from the location of the work shown on drawings

M-10 and M-11. Furthermore, there is an expansion joint wall that is approximately 18 inches in height that will have to be overcome between the outlet chamber and closest access opening.

Question No. 37: Note 3 on drawing S-10 states “All existing manholes shall be modified and raised to provide 24” minimum clearance above finished grade. See mechanical sheet S-14 for mechanical details.” No mechanical sheet #14 is provided, and structural sheet S-14 does not have a detail regarding the manhole elevation modifications. Please provide clarification on this drawing note.

Answer No. 37: Published in Amendment 0004. Existing manholes do not have to be raised. Note has been removed. See revised Sheet S-10.

Question No. 38: Please confirm that all areas disturbed are to be sodded including the stockpile area?

Answer No. 38: All disturbed areas shall be restored using seeding method, as shown in Sheet C-

07; with the exception of the top of the North Clearwell, which shall be covered with a green roof system.

Question No. 39: There is a reference to see note 14 near the south-east corner of the North

Clearwell on sheet C-04 but this note does not exist, please provide

Answer No. 39: Published in Amendment 0003. Correct note reference is "See note 11". Refer to revised Sheet C-04, Note 11.

Question No. 40: There are multiple lines shown between columns on sheet M-01, can you please clarify what these lines represent?

Answer No. 40: Published in Amendment 0003. Lines have been removed for clarity. Refer to revised Sheet M-01.

Question No. 41: Refer to Drawing C-2. The 72” North Clearwell Bypass pipe appears to tie-in to both the 78” South Clearwell Bypass pipe and the Sluice Gate Chamber. Please provide more detailed drawings for this area. Please confirm that there are existing valves to isolate the pipelines and allow replacement of the sluice gates in the sluice gate chamber and the north clearwell chemical vault.

Answer No. 41: The existing 72" North Clearwell Bypass does not tie in to the 78" South

Clearwell bypass. Contractor shall replace gate 6-41, 6-44 and abandon 6-43 while the South

Clearwell is drained and out of service. Gate 6-42 isolates the gate chamber from the North

Clearwell. The contractor must be prepared to dewater the chamber assuming gate 6-42 leaks.

After the South Clearwell testing is complete, the North Clearwell will be drained and work will commence on placement of the static mixer, Accusonic cables and new sluice gate 6-37. Gate 6-

42 shall be replaced prior to refilling after the work on gate 6-37 (which is the SCW bypass) is completed. Replacement of Gate 6-42 requires a full system shut-down and must be carefully coordinated with WA and restricted to no more than a 72-hour outage.

Question No. 42: Refer to Drawing M-13. The 78” South Clearwell Bypass pipe (“78” Main to

Gravity Area”) and the 78” South Clearwell Effluent pipe (78” Main”) appear to tie-in at a wye downstream of the clearwells. Please confirm that there is a valve on each pipeline to isolate the clearwells and not allow flow to backup into the clearwell where the work will be performed.

Answer No. 42: The question does not seem to apply to this sheet. The connection mentioned is not shown on Sheet M-13. The flow of these pipes is controlled by sluice gate 6-37 and sluice gates in the NCW gates chamber. Refer to Answer No. 41 for information on sequence of work.

Question No. 43: Please confirm that the Clearwells can be dewatered by the owner through the existing effluent and/or drain lines.

Answer No. 43: Yes, the clearwells will be dewatered by the Washington Aqueduct.

Question No. 44: Please confirm that there will be no requirement to clean lime out of the clearwells.

Answer No. 44: No lime cleanup is required in the clearwells, only from within the 48" pipe indicated on Sheet M-13.

Question No. 45: Please confirm that the owner can provide the water for the 30 day operational period of the Clearwells.

Answer No. 45: Yes, the water will be provided by the Washington Aqueduct.

Question No. 46: Please clarify the process for disinfecting the water in the Clearwell prior to placing the Clearwells back in service.

Answer No. 46: Published in Amendment 0004. WA will handle the disinfection of the clearwells at McMillan WTP since they are within plant premises and can feed the hypo. The clearwells drain into the sewer system and there is no need for de-chlorination before discharges. Government staff will handle disinfection. Refer to revised Specification Section 01 92 10, Part 1.1.d.

Question No. 47: Refer to article 1.1.e. on page 1 of specification section 01 92 10. Where can the water be disposed onsite and how much can it handle?

Answer No. 47: Published in Amendment 0004. The stormwater system can be used to dispose of water not contaminated with ammonia or chlorine, or VOCs. Water contaminated with chlorine or ammonia shall be disposed of into the sanitary sewer system. Water contaminated with VOCs will require removal and disposal at a facility designed to handle VOCs. Refer to revised Specification

Section 01 92 10, Part 1.1.e.

Question No. 48: Refer to article 1.1.b.2. on page 1 of specification section 01 92 10. The contract completion duration for this work is listed as XXX calendar days. Please provide a value and make it consistent with the shutdown period listed on page 8 of this same specification.

Answer No. 48: Published in Amendment 0004. Please refer to revised Section 01 92 10, Part

1.1.b.2.

Question No. 49: Refer to article 1.5.b.3.d. on page 5 of specification section 01 92 10. Please clarify why the 78” South Clearwell pipe needs to be plugged if the pipe can be isolated per

1.5.b.3.b. Also, if the plug is installed how would it be removed after the mixer is installed per drawing M-11.

Answer No. 49: Published in Amendment 0004. The 78" SCW pipe does not need to be plugged.

Refer to revised Specification Section 01 92 10, Part 1.5.b.3.

Question No. 50: Refer to article 1.5.c.1.f. on page 6 of specification section 01 92 10. Please clarify the purpose of this 78” plug. Where would the access be to install the plug? Also, if the plug is installed how would it be removed after the mixer is installed per drawing M-6?

Answer No. 50: Published in Amendment 0004. No plug is required. Refer to Answer No. 49 and revised Specification Section 01 92 10, Part 1.5.c.1.

Question No. 51: Page 1 of specification section 01 92 10 states that the construction time for this phase is 175 calendar days. However, page 8 of the same specification states 13 weeks. Please confirm that the duration is 175 calendar days.

Answer No. 51: Published in Amendment 0004. The duration in Section 01 92 10, Part 1.6.c.2 is the duration for which the South Clearwell will be out of service, allowing for the specified work to take place.

Question No. 52: Note 2 on drawing C2 states to replace sluice gates 6-41 & 6-42 when the South

Clearwell is out of service. However, it appears that these gates cannot be isolated when the North

Clearwell is full of water. Please confirm that a full plant shutdown will be allowed to replace these gates.

Answer No. 52: Refer to Answer No. 41 for additional information on sequencing of work.

Question No. 53: Refer to drawing M-13. Please confirm that the 48” drain pipe and the 48” blow off pipe can be isolated by the owner in order to be cleaned and televised. What is the access to these pipelines. Does pipe need to be removed and reinstalled to access the pipe?

Answer No. 53: Based on as-built information, 48" drain and blow off pipes can be isolated. Points of entry are at the boat house and east shaft gate house, as shown on Sheet M-13, unless the North

Clearwell is empty affording an additional entry at the clearwell drain. Refer to revised sheet M-

13, published in Amendment 0003.

Question No. 54: Refer to drawing C-2. Sequence of work note 1.C. states to install a temporary bulkhead prior to gate 6-42. Please clarify the purpose of this bulkhead. Also, note 9 on drawing

M-4 states to provide a temporary plug. This seems to be a duplication and only be applicable if the North Clearwell was taken out of service and the work performed before the South Clearwell.

Answer No. 54: Published in Amendment 003. No temporary bulkhead is required. Refer to revised Sheets C-02 and M-04 and Answer No. 41 for additional information on sequencing of work.

Question No. 55: Item 005 on the bid form provided in Addendum 1 states that it shall include the cost of the installation of 3 new gate valves. Please confirm this should read sluice gates.

Answer No. 55: Published in Amendment 0004. "Gate valves" has been replaced with "sluice gates". Refer to revised Price Schedule.

Question No. 56: Item 015 on the same bid form also states gate valve for this section of work.

Please confirm it should read sluice gate.

Answer No. 56: Please refer to Answer No. 55.

Question No. 57: Can you please clarify if we are required to install a new perimeter wall under the existing concrete slab? Per section 2 S-10 on sheet S-05 it appears to show a wall at these locations.

Answer No. 57: Published in Amendment 0004. The new perimeter wall is to be installed underneath the edge of the new concrete slab where the new roof overlaps the existing North

Clearwell wall. Refer to revised Sheet S-10 for more information.

Question No. 58: Regarding specification section 15790 Part 2.01-A (Approved manufacturers for Pre-Engineered Custom Central-Station Air Handling Units): Can TMI Climate Solutions be added to the list of acceptable manufacturers?

Answer No. 58: Referenced specification section is not included in this project.

Question No. 59: Drawing C04 section A top of the page says to see note 14. There is no note 14 on this drawing. Please clarify?

Answer No. 59: Published in Amendment 0003. Refer to Answer No. 39.

Question No. 60: Banneker Ventures is interested in bidding on this project. We have spoken with a number of subcontractors and many will be out of the office during the week of Christmas leading up to the New Year. We are therefore respectfully requesting a 14 day extension in the due date for proposals. We believe that the Government will have more coverage and bidders and will receive significantly better pricing for this project if the due date is extended.

Answer No. 60: Published in Amendment 0004. The due date for proposals has been extended to

January 8, 2018.

Question No. 61: Please confirm if the contractor is required to provide builders risk insurance for this project.

Answer No. 61: The Contractor will be required to furnish proof of insurance, including copies of the required endorsements, and performance and payment bonds within 10 calendar days following the Contractor's receipt of the contract award.

Question No. 62: Please confirm that the trade permits can be obtained at no cost to the contractor.

If not, then please provide the cost so we can include it in our bid.

Answer No. 62: Trade permit will be required for the Backflow Preventer installation in the

Chemical/Filter Building. All other work will not require trade permits. Include cost for trade permit for Backflow Preventer installation in bid.

Question No. 63: Please confirm that if we follow the proper safety standards & regulations and provide the required safety data, that it is possible that the North & South Clearwells can be downgraded from a permit required confined space to a non-permit required confined space. If this is not possible then all personnel working in these spaces would need to be tied-off 100% of the time which would add high cost and is not feasible.

Answer No. 63: Work within the NCW, SCW and various related vaults are designated confined spaces and permits will be required for any work entering a confined space.

Question No. 64: Can the government provide any other information related to the vault door and day gate needed? These specs specify all three of our vault doors-the 5-A (armory storage), the 5-

V (classified information storage), and the 5-B (embassy use). Please clarify.

Answer No. 64: Disregard Section 08 34 59 Vault Door and Day Gate.

Question No. 65: The specs ask for a door that meets any/all of the available options. Please clarify:

o Provide a door which is Class [5-V] [5-A] [5-B], 5-V is a Security Door with an X-10 Lock meeting Federal Spec FF-L-2740 – 5-A is an Armory Door with an S&G 2937 lock meeting

Federal Spec FF-L-2937. 5-B are never ordered anymore. Please choose one.

o Type [IR – right opening swing with optical device] [IL – left opening swing with optical device] [IIR – right opening swing without optical device] [IIL – left opening swing without optical device] [IIIR – double leaf, active right opening swing] [IIIL – double leaf, active left opening swing – Here every swing possibility is listed. Swing is determined by standing OUTSIDE the vault, facing the vault door. If the hinges are on the right, it is Right

Swing, etc. In addition to the swing, please specify if the government requires an Optical

Device (which is like a peep hole.

o Style [H – hand change combination lock] [K – key change combination lock], Design [S

– single lock] [B – no exterior hardware]. – Everything is how Key Change, Style K.

o [The optical device must permit observation from the [inside to the outside] [outside to the inside] of the vault.] – This part suggests the government does want the Optical Device, but we need to know if they want to see in the vault, or out of the vault.

Answer No. 65: Disregard Section 08 34 59 Vault Door and Day Gate.

Question No. 66: Reference the Wage Determination Decision provided with the contract documents. There are no wage rates provided for equipment operators. Please provide.

Answer No. 66: If the classification needed is not listed on the wage determination, then the awarded contractor would have to fill out a SF-1444, request for additional classification, to have it added.

Question No. 67: Can you please clarify what asbestos needs to be removed. Spec section 02 82

13.00 10 has been provided but is not clear if or what asbestos has to be removed?

Answer No. 67: The engineer has no information concerning the presence of asbestos in the project site area, therefore the Specification was included in case asbestos is encountered during construction. For the purpose of the Bid, the Contractor should disregard Spec 02 82 13.00 10.

Question No. 68: Reference Dwg M-13 48” Drain Cleaning. Please confirm there is only one (1)

48” cast iron pipe to be cleaned and inspected.

Answer No. 68: Only one (1) 48" cast iron pipe is to be cleaned and CCTV surveyed as indicated on sheet M-13.

Question No. 69: There are specs for 081113 Steel Doors & Frames, and 083459 Vault Doors &

Day Gates. I do not see any on this project. Please clarify where they are required.

Answer No. 69: Disregard Section 08 11 13 Steel Doors and Frames and Section 08 34 59 Vault

Doors and Day Gates.

Question No. 70: Please reference C-02. Sequence of Work Note 1.J states that the South

Clearwell Bypass Sluice Gate 6-37 install is included with the Base Bid. However, this work is also described in Optional Bid Item 15. Please advise where the costs for this work should be included.

Answer No. 70: Published in Amendment 0004. South Clearwell Bypass Sluice Gate 6-37 install is part of the Base Bid. See revised Price Schedule (now Base Bid Item 0006).

Question No. 71: This project requires the addition of instrumentation devices and motor actuators. There does not appear to be any required to modify the existing SCADA system to accommodate these new devices. Are we to just install the devices and necessary control wiring and the SCADA modifications will be handled outside this contract? Or are the SCADA modifications supposed to be included with our price? If so, please provide a specification and details of the necessary SCADA modifications.

Answer No. 71: The WA performs their own SCADA modifications/programming; therefore, the programming is not a part of this contract. For sluice gates and valves, in the vicinity of North and

South Clearwell Gatehouse, the Contractor shall provide SCADA system input signals in the nearest gatehouse. For valves and sensors in valve vault 6-52, the Contractor shall provide SCADA system input signals in the SCADA room next to Control Room on the second floor of the

Chemical Building. WA will provide locations to land the signals and verify functionality.

Question No. 72: Based on note L-1 on sheet S-01 we cannot place a live load in excess of 35

PSF on the existing roof during earthwork operations. We believe this requirement will prohibit us from using any earthwork equipment, can you please confirm this is the correct PSF? In addition to the loading requirements, note L-1 also states that we are to provide equipment working platforms if additional potential unsafe locations are identified. There is a significant cost to build work platforms and perform all the earthwork from these platforms, can you please confirm that this cost should be carried in our estimate or will this be evaluated once an unsafe condition is identified?

Answer No. 72: Published in Amendment 0004. The L-1 note has been revised. Cost to perform all the work as specified should be included in the price. See Sheet S-01, Revision 2.

Question No. 73: Revised bid schedule shows item 12 and 13 in LF and sheet S-20 indicate the units in CF. Please clarify.

Answer No. 73: Published in Amendment 0004. Refer to revised Price Schedule.

Question No. 74: Addendum #3 Drawings S-13 Note #5 and Question #11 calls for a new FRP baffle wall height of +- 23 feet. However, drawing S-03 and S-03A call for the wall to be about 2” lower than the column caps. This would make the wall approximately 26.5 feet in height. Please explain or provide and elevation for the top of the baffle wall.

Answer No. 74: Published in Amendment 0004. Note #5 on sheet S-13 is correct, baffle wall height should not exceed the invert elevation of the existing overflow pipe which is 158 feet. Note

#5 on sheets S-03 and S-03A have been revised. Refer to revised Sheets S-03 and S-03A.

Question No. 75: On Drawing M-11 does not call for the wall pipe that the 78” BFV connects to be recoated. In the site walk through it was indicated that this was going to be needed. Please provide direction as to where this pipe will need ballasted and recoated.

Answer No. 75: The documents do not call for the existing wall pipe to be blasted and painted.

Question No. 76: What is the finished floor elevation of the south end of the North Clearwell?

Answer No. 76: The finished floor elevation of the south end of the North Clearwell is ± 135.5 feet.

Question No. 77: Specification Section 06 72 11-2.1 calls for a “Baffle Roof System”. Is this an error or is a baffle roof system to be provided and if so please indicate where in drawings it can be found?

Answer No. 77: Published in Amendment 0004. This is a typo error. Refer to revised Section 06

72 11 Part 2.1.

Question No. 78: Specification Section 06 72 11-2.1 has a section that states “This area is reserved for instructions of what samples are to be provided in the event that the client desires” Are samples to be required, and if so please revise.

Answer No. 78: No samples are required regarding this specification section; the baffle wall system needs to be revised and approved by the Engineer.

Question No. 79: Is new conduit to be repainted. It is unclear in Specification Section 09 90 00?

Answer No. 79: Exposed conduits are to be painted.

Question No. 80: Please indicate where Specification Section 08 11 13 - Steel Doors and Frames applies to the drawings and if this Specification Section is required?

Answer No. 80: Please refer to Answer No. 69.

Question No. 81: Specification Section 09 06 00 - Schedules For Finishes appears incomplete.

Please advise where this specification section applies to the contract.

Answer No. 81: Specification section is not applicable to this project and has been removed.

Question No. 82:

a. Note on drawing M-13 states that the “contractor is responsible for removal and proper disposal of any material not washed into the truck sewer.” Is the intent that the diluted residue material from cleaning the pipe drain be washed into the trunk sewer? If this is not acceptable, the material will be vacuumed out and hauled away for disposal. Please clarify the intent for the removal and disposal of lime sludge in the pipe.

b. If removal and disposal is required, please provide chemical analytical data on the lime sludge material so the type of disposal requirements can be identified. i.e. Will the material need to be disposed of at a hazardous waste facility or regular landfill?

c. If material can be washed into the trunk sewer, are there any restrictions on the amount of material that can be flushed, or at what rate?

Answer No. 82:

a. During normal draining and cleaning of the Clearwell, the residual lime is washed into the trunk sewer. The lime sludge in the 48” pipe is simply residual from years of cleaning.

b. The material is lime sludge. Potentially trace amounts of alum may be in the sludge but it has never been classified as hazardous waste.

c. There are no restrictions on washing the material into the trunk sewer.

Question No. 83: Our pipe cleaning sub-contractors have advised that cleaning a pipe of this size and length will be a large operation, and have expressed concern about the available area for their equipment and storage tanks should the material need to be removed and hauled away. Given that we are expecting approximately 7400 CF of material, a lot of room will be required for storage tanks. It is anticipated that at the East Gate House entry point they will need 1 lane of the adjacent road to be shut down for several hundred feet in order to perform the work, and at the East Shaft

Gate House the parking lot area in front of the gate house will be needed. Please confirm the above will be acceptable.

Answer No. 83: Work plan proving that traffic will not be impeded must be submitted for

Government approval. If area is not within WA property, i.e. outside the fence, additional coordination to obtain permit is required with appropriate agency.

Question No. 84: Our pipe cleaning contractors have advised that additional information is required in order to accurately quote this scope of work. Please provide the following:

a. Flow conditions in the pipe that are to be expected during the work.

b. Flow conditions of the 78” trunk sewer.

c. CCTV requirements and specifications.

d. MOT requirements, if any, for each location

e. SDS or product info on the lime used to treat the water

Answer No. 84:

a. If the NCW is empty, no flow is expected. If the North Clearwell is operational, flow from leaking sluice gate may be expected

b. Flow in the 78” sewer is unknown

c. The CCTV requirements and specification are governed by your professional engineer who will review the videos and provide a condition assessment.

d. Contractor must file a work plan demonstrating how traffic will be managed within the property.

e. The material is lime sludge, no hazardous materials involved.

Question No. 85: Please advise if the East Shaft Gate House needs to be fenced/gated at all times and if temporary fencing will be required to enclose the work area if it extends into the parking lot.

Answer No. 85: Securing the worksite is a contractor responsibility. If conditions are such that hazards can be accessed by the public, the contractor should take steps to control such access.

Means and methods are up to the contractor.

Question No. 86: The equipment used to clean the pipe is heavy and will need to be placed at the points of ingress. Are there any weight restrictions on the existing structures at these points?

Answer No. 86: The pump houses are over 100 years old. Load bearing information is not available. Given this uncertainty, weight of heavy equipment should be supported over as large a surface area as practical.

Question No. 87: Will isolation of the 48” line from the trunk sewer be required?

Answer No. 87: No.

Question No. 88: Can wash water be disposed of on site?

Answer No. 88: Published in Amendment 0004. Please refer to Answer No. 47.

Question No. 89: Section 030135 page 5 3.1 General Requirements states “This Surface preparation shall be applied to all of the entire interior surface of the walls and slab of the reservoir, including areas where repair will not be required.” Do you sandblast or waterblast the floor slab and ceiling slab or only floor slab?

Answer No. 89: Published in Amendment 0004. Waterblasting for all areas to be repaired. Refer to revised Section 03 01 35, Part 3.1 and Note 4 on Sheet S-20, Revision 2.

Question No. 90: In optional bid item 0007 the line item calls for 750lf of waterproofing membrane patch. Are we to price only the membrane patching or should we include the grout injection as per detail 4/S-21?

Answer No. 90: Published in Amendment 0004. As per Detail 4/S-21, include price for waterproof injection grouting. Refer to revised Sheet S-20 and revised Price Schedule. Please note that Bid

Item 0007 is now Bid Item 0009.

Question No. 91: Optional bid items 0010 and 0011 have the same description with different quantities. Are any of these line items missing description?

Answer No. 91: Published in Amendment 0004. Refer to revised Price Schedule for latest.

Question No. 92: In detail 4/S-20 existing conditions the detail reads “remove joint sealant and expansion joint material” and directly above it reads “existing construction joint filler and sealant to remain”. How exactly are we supposed to accomplish that?

Answer No. 92: Published in Amendment 0004. Please refer to Sheet S-20, Revision 2 for latest.

Question No. 93: Drawing S-20 concrete repair schedule pay item 002 calls for 750lf per detail

3/S-20. Drawing S-08 detail 1/S-03A, same scope, calls to repair ALL bottom slab cracks per detail 3/S-20. Please clarify the quantity to be priced and performed. Is it 750lf or all? What is all?

Answer No. 93: Label on Sheet S-08 indicates to "See Note 2" for bottom slab cracks. Note 2 indicates that "all" refers to cracks or construction joints deemed in need of repair and to use table on Sheet S-20 for bidding purposes. Published in Amendment 0004. Refer to revised Sheet S-20 and revised Price Schedule for latest.

Question No. 94: Drawing S-08 detail 1/S-03A reads repair ALL bottom slab joints per detail 2/S-

20. Drawing S-20 concrete repair schedule unit price pay item 001 calls for 750lf. Please clarify the quantity to be priced and performed. Is it 750lf or all? What is all?

Answer No. 94: Label on Sheet S-08 indicates to "See Notes 2 and 4" for bottom slab joints. Note

2 indicates that "all" refers to cracks or construction joints deemed in need of repair and to use table on Sheet S-20 for bidding purposes. Published in Amendment 0004. Refer to revised Sheet

S-20 and revised Price Schedule for latest.

Question No. 95: The drawings and specification do not state what waterproofing membrane is to be used on top of the new concrete deck. Is the owner’s thought process to obtain a 20 year NDL and allow the contractor to choose a waterproofing system?

Answer No. 95: The goal is for the contractor to provide a complete green roof system. The membrane should be part of the green roof system and defined in a submittal for approval.

Question No. 96: Addendum #3 Drawings S-13 Note #5 and Question #11 calls for a new FRP baffle wall height of +- 23 feet. However, drawing S-03 and S-03A call for the wall to be about 2” lower than the column caps. This would make the wall approximately 26.5 feet in height. Please explain or provide an elevation for the top of the baffle wall.

Answer No. 96: Published in Amendment 0004. Please refer to Answer No. 74.

Question No. 97: On Drawing M-11 does not call for the wall pipe that the 78” BFV connects to be recoated. In the site walk through it was indicated that this was going to be needed. Please provide direction as to where this pipe will need blasted and recoated.

Answer No. 97: Published in Amendment 0004. Please refer to Answer No. 75.

Question No. 98: What is the finished floor elevation of the south end of the North Clearwell?

Answer No. 98: Please refer to Answer No. 76.

Question No. 99: Specification Section 06 72 11-2.1 calls for a “Baffle Roof System”. Is this an error or is a baffle roof system to be provided and if so please indicate where in drawings it can be found?

Answer No. 99: Published in Amendment 0004. Please refer to Answer No. 77.

Question No. 100: Specification Section 06 72 11-2.1 has a section that states “This area is reserved for instructions of what samples are to be provided in the event that the client desires”

Are samples to be required, and if so please revise.

Answer No. 100: Published in Amendment 0004. Please refer to Answer No. 78.

Question No. 101: Is new conduit to be repainted. It is unclear in Specification Section 09 90 00?

Answer No. 101: Please refer to Answer No. 79.

Question No. 102: Please indicate where Specification Section 08 11 13 - Steel Doors and Frames applies to the drawings and if this Specification Section is required?

Answer No. 102: Please refer to Answer No. 69.

Question No. 103: Specification Section 09 06 00 - Schedules For Finishes appears incomplete.

Please advise where this specification section applies to the contract.

Answer No. 103: Please refer to Answer No. 81.

Question No. 104: Per section 32 01 16.71 for Cold Milling Asphalt Paving it says the payment will be to the nearest SY, can you confirm this and provide a quantity of paving to bid?

Answer No. 104: Published in Amendment 0004. Section 32 01 16.71, Part 1.1 has been removed.

Work requiring cold milling asphalt paving for Vault 6-52 work in included as LS in Bid Item

0001. See revised Section 32 01 16.71.

Question No. 105: Per section 32 12 13 for Bituminous Tack and Prime Coats it says payment will be made per contract unit prices. Can you please confirm and provide a quantity?

Answer No. 105: Published in Amendment 0004. Section 32 12 13, Part 1.1 has been removed.

Work requiring bituminous tack and prime coating for Vault 6-52 work is included as LS in Bid

Item 0001. See revised Section 32 12 13.

Question No. 106: Dependent on the method of removal of the lime sludge from the 48” drain line, there is the potential to need a large amount of work area outside the East Gate House and

East Shaft Gate House. Both of these areas are outside the Limits of Disturbance for the project.

Please confirm this is acceptable.

Answer No. 106: For work outside the Limits of Disturbance, a work plan will be required to be filed with WA for approval.

Question No. 107: Item 2 on bid schedule shows 100 LF of water-proof grouting which is not indicated on the concrete repair schedule as per sheet S-20. Please advise and provide updates?

Answer No. 107: Published in Amendment 0004. First item in Concrete Repair Schedule has been revised to read bid item 0002. Refer to revised Sheet S-20.

Question No. 108: Drawing S-14 note 3, calls for coating 500 SF of 200 mil thick water tight sealant in effluent meter vault. This is not shown on the bid schedule and concrete repair schedule provided. Please provide clarification and update.

Answer No. 108: Published in Amendment 0004. Refer to revised Price Schedule, Bid Item 0002.

Question No. 109: Item 7 on bid schedule shows 750 LF of waterproof Membrane Patch which is not indicated on the concrete repair schedule as per sheet S-20. Please advise and provide updates?

Answer No. 109: Published in Amendment 0004. Please refer to Comment Response 0090.

Question No. 110: Is it the intention that no equipment be placed on the top of the north clearwell for the removal of the overburden? As per notes L-1, L-2, and L-3 the requirements of maintaining a maximum 32 PSF while soil is on top of the clearwell and 165 PSF when the soil is stripped would make it impossible to run even the lightest piece of equipment over the Clearwell without building a platform that extends down to the columns…