B.08.03 Continuation page Amendment3.pdf

Continuation Page:

SOLICITATION:

1. Section 00 21 13 – Instructions to Bidders: REVISE as follows:

a. BID SUBMISSION TIME: REPLACE “9:00AM EST on 06 JUL 2020” with “10:00AM EST on 07 JUL 2020”

b. BID OPENING TIME: REPLACE “10:00AM EST on 06 JUL 2020” with “11:00AM EST on 07 JUL 2020”

SPECIFICATIONS:

2. Section 01 00 00, Paragraph 1.13: ADD the following new paragraph:

“1.13 USACE GOVERNMENT FIELD OFFICE

The Contractor shall, furnish and maintain a lockable, trailer-type mobile office acceptable to the KO and providing as a minimum the facilities specified below. The trailer shall be securely anchored to the ground by suitable tie downs and leveled prior to occupancy at all four corners to guard against movement during high winds. This trailer may need to move in accordance with construction sequence. Any relocations will be at the expense of the Contractor.

USACE Government Field Office Within 60 days of award, the Contractor shall design and provide Government office space for a Resident Engineer and Project Engineer and include the following:

a. Offices: (2) lockable offices 12’x10’ with power and data outlets.

b. File storage area with power and data outlets for two network printers.

Include 1 drawing table.

c. Supply store room

d. Drinking fountain.

e. A unisex toilet with lavatory. Supply water from domestic water utility and tie sanity line to sewer utility.

f. Kitchen/break area with one sink and counter, cabinets, one under counter refrigerator, one microwave, supply water from domestic water utility.

g. HVAC for cooling and heating. Provide necessary periodic maintenance of HVAC system including filter changes.

h. Utilities – Electricity will be available from adjacent buildings. The closest water and sewer utility access points are 500 feet away.

i. Telephone and internet service will only be available via portable wireless wi-fi devices at this site. Connection to the USACE network will not be permitted. The costs associated with wireless internet service used by Government personnel and by Contractor personnel will be paid directly by the Contractor.

Each office shall have sound-insulated walls, and lockable doors. Each office shall include a 36x72 wood desk with a 24X48 return with drawers, 4 drawer 30-inch legal lateral file cabinet, one ergonomic high back desk chair, task lighting/desk lamp, 5-shelf bookcase. Both offices shall be furnished with an appropriately-sized white board. Each office space shall include a minimum of four electrical outlets.

Flow and layout of the office shall be coordinated with the Government. Design of Government trailer shall be submitted as a mandatory design package for Government review and acceptance prior to installation.

After final acceptance of the project, the office shall remain the property of the Contractor and shall be removed from the site. Utilities shall be connected and disconnected in accordance with local codes and to the satisfaction of the KO.

During the life of this contract, the Contractor shall provide janitorial services for the above noted Government trailer. The janitorial services will include the following services delivered two times per week: Mopping and/or vacuuming of all walking surfaces; removal of all trash from trash cans and replacement of trash can liner; dusting of all flat surfaces in public spaces. All windows will be cleaned (inside and out) one time per week. In addition, the Contractor is required to provide the following supplies (replenished as depleted) for the life of the contract: paper towels on rack in kitchen, trash liners for all trash cans and a hand sanitizing dispenser mounted on the wall outside of the kitchen. Janitorial services will be provided during construction work hours.”

3. Section 01 35 26, Paragraph 1.6.1.1: REPLACE the text under this heading with the following: "The SSHO may not serve as the Quality Control Manager but the SSHO may serve as the Superintendent."

4. Section 01 45 00, Paragraph 3.7.2: ADD the following at the end of this section: “< https://mtc.erdc.dren.mil/>”.

5. Section 01 50 00, Paragraph 3.3.2.c: ADD the following after paragraph 3.3.2.c: “d. Potable water service and sewer hookups are not readily available; however, the closest connection to these utilities can be provided at a location approximately 500 feet away.

The Contractor shall be responsible for the connection to, maintenance of, and removal of any utility connections at the Contractor’s or Government’s temporary administrative trailers. Connections may not impede vehicular traffic in established roadways. Electrical hookups will be available at these locations. Phone and internet service will only be available via wireless devices provided by the Contractor. Connection to the USACE network will not be permitted.”

6. Section 01 50 00, Paragraph 3.5.4: REPLACE the text under the Storage Area heading with the following: “Construct a temporary fence around material storage area. Avoid damage to underlying utilities. Do not place or store materials or equipment outside the fenced area. Do not stockpile materials outside the fence in preparation for the next day’s work.”

7. Section 03 30 00.00 10, Paragraph 3.16.b: ADD the following information to the table:

Under “Area”, ADD “Top of Basin Slab”, Under “Type of Finish” for Top of Basin Slab, ADD “S-1”, Under “Required Form Tolerances” for Top of Basin Slab, ADD “S-B".

8. Section 04 20 00, Paragraph 2.2.2.2: ADD the following sentence at the end of this paragraph: “Brick and mortar samples shall be submitted to Owner for color and texture approval prior to constructing mock-up panel. Samples shall be resubmitted until the color and texture of the proposed brick and mortar are approved by the Owner.”

9. Section 04 20 00, Paragraph 2.4.1.2: REPLACE the last sentence with " Furnish and install stainless steel dovetail slots, 20-gauge, SST 304 or SST 316, to be cast into concrete wall."

10. Section 07 17 00, Paragraph 2.1.3: ADD the following at the end of this paragraph: “Roll-type bentonite waterproofing is acceptable.”

11. Section 07 52 00, Paragraph 3.3.5.4: DELETE this paragraph in its entirety.

12. Section 09 96 00, Paragraph 2.2.1: REVISE to read as follows: "2.2.1 Application:

Apply to exposed steel surfaces, including structural steel, miscellaneous metals, steel lintels, monorails, equipment and supports, piping and supports including piping prior to insulating, and other exposed steel items."

13. Section 09 96 00, Paragraph 2.6: REPLACE the second sentence with “Color code piping in accordance with Washington Aqueduct color code requirements to be furnished after bidding.”

14. Section 23 00 00, Paragraph 1.2.3: REVISE to read as follows: “1.2.3 Color Coding:

Color coding of all piping systems shall be in accordance with Washington Aqueduct color code requirements to be furnished after bidding.”

15. Section 27 21 10.00 40, Paragraph 2.5.1: REPLACE the second sentence Paragraph 2.5.1 to read: "Type 1 Fiber as shown on the Electrical Drawings shall be 12 pairs."

16. Section 31 23 16, Paragraph 1.6.1.e: ADD the following at the end of this paragraph: "No tie backs or ground anchors are allowed."

17. Section 35 20 16.27, Paragraph 2.3.i.1: DELETE the final sentence in this paragraph that reads "Chemical anchors are not permitted."

18. Section 35 20 16.27, GATE SCHEDULE: For gates FV-29-3-1 THRU -6, CHANGE the entry under “Thimble Required?” to "NO". For gates FV-M29-2-1, FV-M29-2-2 and FV- M29-9, CHANGE the entry under “Thimble Required?” to "YES, Type 316 SST".

19. Section 40 05 13, Table 1 Valve Schedules: CHANGE the entry under Size (Inches) for valve FV-M30-8-1 from "30" to "24".

20. Section 40 95 00 Paragraph 2.3.1.2.q: CHANGE paragraph to read: "Special Coating: All PLC, backplane, modules, and similar devices specified above shall be conformal coated and shall comply with Allen-Bradley ControlLogix 1756 Standard Products with Conformal Coating. These include controllers, communications modules, I/O modules, power supplies, and chassis."

21. Section 40 95 00, SEQUENCE OF CONTROL Supplement, Backwash Equalization Basin Operating Overview: CHANGE the last sentence of the first paragraph on Page 5 to read:

"One new stainless-steel control panel is provided for both cells, with the flush gates that include a hydraulic pump to operate the flush gate locks and electrical and control components for the gates."

22. Section 40 95 00, SEQUENCE OF CONTROL Supplement, Loop M29-15, Sodium Hypochlorite Valves FV M29-15-1 and FV-M29-15-2 and Programming Related to Existing Hypo Pumps: REPLACE Sequence of Control description for LOOP M29-15, with the following:

“LOOP M29-15, SODIUM HYPOCHLORITE VALVES FV-M29-15-1 AND FV-M29-

15-2 AND PROGRAMMING RELATED TO EXISTING HYPO PUMPS

THE FOLLOWING SEQUENCES ARE TO BE PROGRAMMED IN EXISTING

CONTROL PANEL EM11. EM-11 IS LOCATED IN THE BASEMENT AREA OF THE

MCMILLAN WTP CHEMICAL BUILDING AND SERVES THE CAUSTIC SODA

TANKS AND FEED PUMPS. EM-11 IS THE CLOSEST EXISTING PLC TO THE NEW

SODIUM HYPOCHLORITE VALVES FV-M29-15-1 AND FV-M29-15-2.

SEE SPECIAL SECURITY REQUIREMENTS IN SPECIFICATIONS 40 95 00

RELATED TO PROGRAMMING OF EXISTING PLCS.

PLC- FUNCTIONS:

A. Receive sodium hypochlorite valves FV-M29-15-1 and FV-M29-15-2 OPENED, CLOSED, and REMOTE signals.

B. Provide OPEN and CLOSE command signals via new interposing relays to valves.

C. Receive SODIUM HYPOCHLORITE VALVE FV-M29-15-1 TO BACKWASH EQ BASIN momentary OPEN and CLOSE selections from HMI for control of valve when in REMOTE. Output to valve shall remain latched unless valve is not in REMOTE or the other valve position is requested (example OPEN to CLOSE). Note: Only one valve can be opened at a time. One valve must be closed before the other valve can be opened.

D. Receive SODIUM HYPOCHLORITE VALVE FV-M29-15-2 TO BOOST B momentary OPEN and CLOSE selections from HMI for control of valve when in REMOTE. Output to valve shall remain latched unless valve is not in REMOTE or the other valve position is requested (example OPEN to CLOSE). Note: Only one valve can be opened at a time. One valve must be closed before the other valve can be opened.

E. Generate SODIUM HYPOCHLORITE VALVE FV-M29-15-1 TO BACKWASH EQ BASIN FAIL TO OPEN alarm to HMI if valve is commanded to OPEN and OPEN signal is not received within the amount of time it takes valve to travel from full closed to full open plus 15 seconds.

F. Generate SODIUM HYPOCHLORITE VALVE FV-M29-15-1 TO BACKWASH EQ BASIN FAIL TO CLOSE alarm to HMI if valve is commanded to CLOSE and CLOSE signal is not received within the amount of time it takes valve to travel from full open to full close plus 15 seconds.

G. Generate SODIUM HYPOCHLORITE VALVE FV-M29-15-2 TO BOOST B FAIL TO OPEN alarm to HMI if valve is commanded to OPEN and OPEN signal SODIUM HYPOCHLORITE VALVE FV-M29- 15-2 TO BOOST B FAIL TO OPEN is not received within the amount of time it takes valve to travel from full closed to full open plus 15 seconds.

H. Generate SODIUM HYPOCHLORITE VALVE FV-M29-15-2 TO BOOST B FAIL TO CLOSE alarm to HMI if valve is commanded to CLOSE and CLOSE signal is not received within the amount of time it takes valve to travel from full open to full close plus 15 seconds.

THE FOLLOWING SEQUENCES ARE TO BE PROGRAMMED IN EXISTING

CONTROL PANEL EM10. EM-10 IS LOCATED ON THE GROUND FLOOR OR

THE MCMILLAN WTP CHLORINE BUILDING AND SERVES THE SODIUM

HYPOCHLORITE TANKS AND FEED PUMPS.

SEE SPECIAL SECURITY REQUIREMENTS IN SPECIFICATIONS 40 95 00

RELATED TO PROGRAMMING OF EXISTING PLCS.

PLC- FUNCTIONS:

A. Provide new application point BACKWASH EQUALIZATION BASIN related to the sodium hypochlorite pumps. Presently there are 5 application points in which permissible pumps can be selected to pump to. Pumps shall not be allowed to be associated with more than one application point at a time.

Receive from HMI application point BACKWASH EQUALIZATION BASIN pump selections for permissible pumps 3, 4, 5, or 6 (pump 5 is the normal selection).

B. When a pump is assigned to BACKWASH EQUALIZATION BASIN, that pump shall start whenever a filter in is backwash and the filter is hydraulically backwashing is in progress and valve FV-M29-15-1 is OPEN. The speed of the pump shall be operator entered since the backwash flow is relatively constant. If a pump is selected (3, 4, 5, or 6) and valve FV-M29-15-1 is not OPEN, generate HYPO VALVE TO BACKWASH EQUALIZATION BASIN NOT OPEN signal to HMI (this is a status, not alarm). If Pump 0 is selected, no status shall be displayed at HMI.

HMI FUNCTIONS:

A. On existing sodium hypochlorite pumps screen, provide sodium hypochlorite valves OPEN and CLOSE command button. The buttons shall only be visible if the associated REMOTE mode status is true.

Display REMOTE/NOT IN REMOTE status.

B. On existing sodium hypochlorite pumps screen, provide sodium hypochlorite valves OPENED, CLOSED, and REMOTE status. Valve animation shall be red when valve is OPENED, green when valve is CLOSED, and blue when in transition.

C. Display and alarm SODIUM HYPOCHLORITE VALVE FV-M29-15-1 TO BACKWASH EQ BASIN TO FAIL OPEN and SODIUM

HYPOCHLORITE VALVE FV-M29-15-2 TO BOOST B FAIL TO

OPEN conditions.

D. Display and alarm SODIUM HYPOCHLORITE VALVE FV-M29-15-1 TO BACKWASH EQ BASIN FAIL TO CLOSE and SODIUM

HYPOCHLORITE VALVE FV-M29-15-2 TO BOOST B FAIL TO

CLOSE conditions.

E. Provide new BACKWASH EQUALIZATION BASIN application box and the ability to select Sodium Hypochlorite Pumps 3, 4, 5, 6, or 0.

Display HYPO VALVE TO BACKWASH EQUALIZATION BASIN NOT OPEN status.”

DRAWINGS:

23. Plate No. 5: CHANGE ceiling finish for Room 101, Monorail Room at El 164 from “P-3” to

“P-2”.

24. Plate No. 5: CHANGE ceiling finish for Stair Room 1S1 and B1S1 from “P-3” to “P-1”.

25. Plate No. 6, Concrete Note 3: ADD "revise location" after "Contractor may" and before "of joints". Revised sentence should read: "Contractor may revise location of joints."

26. Plate No. 21, Key Note 7: DELETE "(schedule 80)" from the first sentence.

27. Plate No. 29, Section B: ADD two pipe support references to Detail 314 under the 30"

Settled Water Diversion Pipe inside the Diversion Box. One pipe support should be added to the pipe upstream of the flow meter and the second pipe support should be added downstream of the flow meter, midway between the flange coupling adaptor and the downstream butterfly valve.

28. Plate No. 29, Section C: REVISE note “NEW BRICK” to state “REUSE UNDAMAGED

EXISTING BRICK TO FILL HOLE AROUND NEW PIPE. GROUT COLOR SHALL

MATCH EXISTING FILTER BUILDING GROUT.”

29. Plate No. 37: ADD 38'-6" of additional railing along the west wall of the basin and 44'-6" of additional railing along the east wall of the basin.

30. Plate No. 38: CHANGE the "85'-1"" dimension shown on the right side of the Lower Plan - North and the Lower Plan - South to "83'-1"".

31. Plate No. 42: REVISE the underside of slab elevation from elevation "147.0" to "147.50" and from elevation "148.0" elevation to "148.92".

32. Plate No. 46, General Sheet Note 1: REVISE to read as follows: "1. STEEL FRAMING

MEMBERS AND METAL DECK SHALL BE SHOP PRIMED AND FIELD FINISH

PAINTED IN ACCORDANCE WITH SYSTEM P-1."

33. Plate No. 55, Key Note 4: CHANGE from "… EVERY 4'-0" PER DETAIL…" TO "…

EVERY 5'-0" PER DETAIL…"

34. Plate No. 55: ADD the following after the Note pointing to west 8" scupper drain pipe: "Set horizontal scupper downspout drain pipe centerline high point at elevation 161.58. No turndown is required at the basin."

35. Plate No. 57: CHANGE the notes on plans and sections pointing to outside air intake duct and gooseneck from "316 SST" and "1/4" x 1/4" SST MESH SCREEN" TO " AL" and "1/2" GRID MESH SCREEN" respectively." This note occurs at 4 locations on this sheet.

36. Plate No. 69: CHANGE the valve symbol used for the Backwash Equalization Basin Drain Pump check valves from “ball check type” to “swing check type." Also DELETE reference to “8 INCH STILLING WELL” near LE-M29-4-2.

37. Plate No. 71, Details 107 and 113: REVISE the “starter wall” by lowering the construction joint at bottom of wall to the top face of the slab.

38. Plate 72, Detail 119: REVISE the “starter wall” by lowering the construction joint at bottom of wall to the top face of the slab.

39. Plate No. 72, Detail 121: CHANGE "9"" dowel length in center of slab to "1'-6"".

40. Plate No. 72, Detail 126, Note 8: DELETE "note 8 "in its entirety.

41. Plate No. 77, Detail 220: ADD the following note to this detail: "NOTE: BOTTOM OF

REVEALS CAN END 6 INCHES BELOW GRADE."

42. Plate 78, Detail 301: DELETE reference to "FLEXIBLE COUPLING OR MECHANICAL

JOINT" installed within 2'-0" MAX of face of wall."

GENERAL:

43. Pre-Proposal Site Visit: Attached for information only is the sign in sheet for the Pre-Bid

Site Visit dated 22 JUN 2020.

ATTACHMENTS:

22 JUN 2020 Pre-Bid Site Visit Sign-in Sheet

RFI Responses