B.08.03 RFI Responses.pdf

UNCLASSIFIED\\FOR OFFICIAL USE ONLY

Bid Inquiry Contractor Report All Inquiries

Project: Mcmillan Backwash Discharge to Sewer, Washington Aqueduct in Washington, DC. Review: W912DR20B0016 (00001) (sorted by CommentID ) Displaying 130 inquiries.

Id Discipline Sheet Detail Spec 8612857 Contracting W912DR20B0016 N/A Wage Scale Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The wage scale does not provide any wage classifications for power equipment operators. Please provide.

On: Jun 01 2020.

Government Response. . You will need to submit a SF-1444 after award to have those classifications added. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8614227 General G-001 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The G-001 Cover Sheet lists six Reference Drawings, but they are not included in the PLANS file. Please provide the missing reference drawings.

On: Jun 02 2020.

Government Response. . Reference Drawings 1 through 8 have been added to the contract documents in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8615864 Contracting W912DR20B0016 N/A Bid Bond Form Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

No Bid Bond Form was provided, please confirm that a standard AIA bid bond form will be acceptable.

On: Jun 03 2020.

Government Response. . The Bid Bond must be on a SF-24 Form. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8617101 Contracting Plate 1 N/A N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Plate 1 Refers to 6 "Reference Drawings". These drawings are referenced on other sheets. No Reference Drawings were provided with the project documents. Please provide the Reference Drawings for bidding purposes. Thank you.

On: Jun 03 2020.

Government Response. . Reference Drawings 1 through 8 have been added to the contract documents in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8617111 Contracting Price Schedule Price Schedule 00 10 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please confirm that the basis of award is the sum of the bid items 0001 and 0002. Thank you.

On: Jun 03 2020.

Government Response. . Yes. Please see the EVALUATION OF OPTIONS clause in the issued Solicitation. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8617114 Contracting Page 26 52.219-1 00 45 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Reference FAR 52.219-1 - Small Business Program Representations. Please confirm that this clause does not apply to this project and that the project is full and open per item 10 on the Solicitation.

Thank you.

On: Jun 03 2020.

Government Response. . It applies in accordance with FAR 19.203 (a) (1) On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8618524 Geotechnical G-006 01 05 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

In accordance with Paragraph 1.2.2 of Section 01 05 00, please provide, via amendment, the Geotechnical Report prepared by Jacobs Engineering date July 26, 2019 referenced in Foundation Note on Contract Drawing G-006.

On: Jun 04 2020.

Government Response. . Reference McMillan Backwash Discharge to Sewer - Phase II Geotechnical Engineering Report prepared by Jacobs and dated July 26, 2019 for additional information on previous soil boring information. This report is provided for Information only and is not considered part of the Contract.

Documents.https://www.projnet.org/projnet/binKornHome/index.cfm?

strKornCob=BicPublicFileDownload&strApp=&strPrevCob=BicCheckAllPending&strShown=McMillan_Backwash_Discharge_to_Sewer_-_Phase_II_Geotechnical_Engineering_Report.pdf&intView On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8621608 Contracting Plate 21 Notes 4 & 7 Ammonia Piping Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Notes 4 and 7 on Drawing Plate 21 call for the 4 ea. 1" Ammonia lines to be relocated. Please advise the piping material to be used.

On: Jun 05 2020.

Government Response. . Refer to the following addition to the piping schedule at the end of specification Section 40 05 13 which shall be included in an upcoming amendment: Service:

Ammonia, Size (inches): 1, Material: PVC, Installation: Buried, Test Pressure (psig) and Type: 100(H), Operating Pressure (psig): 25 On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8622604 General Solicitation Page 7, Bid Submision time Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

We respectfully request bid date of 19 JUN 2020 to be extended a minimum of two weeks to allow prospective bidder participation.

On: Jun 05 2020.

Government Response. . The bid date will be postponed by two weeks. Official notification to bidders will be provided via amendment. On: Jun 15 2020

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6/26/2020https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAl...

Current Request Status: Request Closed Information for this report is procurement sensitive.

8622794 Contracting N/A N/A 01 05 00.1.15.4 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

• Spec 01 05 00.1.15.4 states that "Modifications to the sodium hypochlorite feed line serving the South Clearwell Discharge line to install a new tee and two electrically actuated ball valves shall be made in a single 5-hour outage. Finished water disinfection shall be maintained during this modification." Will a temporary feed be needed during the 5 hour shutdown, is there another existing disinfection feed available to the South Clearwell, or is it acceptable to simply shut down this line for the 5 hours it takes to tie the new pipe and valves in?

On: Jun 05 2020.

Government Response. . Alternate hypochlorite feed point and feed pipes can be used to disinfect the water while this tie-in is made. Temporary piping will not be required. On: Jun 15 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8622797 Contracting Plate 53 Notes 5 and 6 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing Plate 53, notes 5 and 6 call to tie the new 24" EQ BW drain into the MH-100. Is this an active manhole that will need to be bypassed in order to install this work?

On: Jun 05 2020.

Government Response. . Existing MH100 receives periodic flows from a 12-inch roof drain pipe and filter to waste flow from the existing filters. The Contract Documents require temporar pumps to be installed in MH-100 to discharge the flow that enters the manhole to a nearby storm drain as fast as it enters. The existing pipe that allows MH-100 to discharge to a nearby sanitary sewer will be plugged while this flow is diverted to prevent sewer gas from filling the manhole. A new hole is to be core drilled in the side of the MH100 base structure to allow connection to the new backwash equalization basin while this pumping occurs. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623307 Contracting 00 72 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Section 00 72 00 on Page 34 of 77 of the Solicitation which states that Clause 52.219-6 – NOTICE OF TOTAL SMALL BUSINESS SET ASIDE is included by reference. It is our understanding that this Solicitation is Full and Open per Item No. 10 of SF 1442 and that 52.219-6 does not apply. If this is incorrect, please notify us via amendment.

On: Jun 05 2020.

Government Response. . THis was addressed in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623310 Construction Phasing 02 41 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Paragraph 1.5 of Section 02 41 00 which provides a schedule of availability for various work areas. This schedule does not align with the current bid Date of June 19, 2020. It is our understanding that all work shall be made available as necessary to meet the Construction Schedule. If this is incorrect, please notify us via amendment.

On: Jun 05 2020.

Government Response. . Section 1.5 AVAILABILITY OF WORK AREAS in Specification Section 02 41 00 shall be revised in an upcoming amendment to indicate that each listed work ar will be made available "As required to comply with the construction sequencing requirements of specification Section 01 05 00." On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623321 Construction Phasing DS100 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Keynote 6 on Contract Drawing DS100 which details the tie-in of the 24" Drain to Ex MH-100. Please clarify the following:

a. It is our understanding that the reference explosion proof sump pump is temporary to facilitate the tie-in work and to be removed by the Contract upon completion of Work in MH-100. If this is incorrect, please notify us via amendment.

b. Please provide estimated Filter to Waste flow data to allow for sizing of this temporary sump pump via amendment

On: Jun 05 2020.

Government Response. . The explosion proof sump pump referenced in Key Note 6 on Plate 21 is intended to be removed following completing of the MH-100 pipe modifications. The maximum filter to waste flow is approximately 1,100 gpm and the total of filter to waste volume per filter backwash event is approximately 49,500 gallons. The filter to waste duration averag 45 minutes per filter backwash. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623325 Structural D-103 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Section B on Contract Drawing D-103 which depicts the Conc Fill at El 152.00 as existing. Section A on Contract Drawing D-103 appears to be depict a bold line at the top of this Con Fill indicating this as new work. It is our understanding that the concrete fill at EL 152.00 is existing. If this is incorrect, please notify us via amendment.

On: Jun 05 2020.

Government Response. . The concrete fill at elevation 152.0 is existing. It is not modified under this project. The bold line should be light lined. Reference replaced drawing in an upcomi amendment. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623331 Structural A-201, A-301, A-302, DA502 03030 00.00 10 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Paragraph 1.4.4.a of Section 03 30 00.00 10 which states that a mockup panel for each form liner specified in Section 03 10 00.00 10 Concrete Forming and Accessories is required.

The referenced Section is not included in the Project Specifications. Furthermore Section 03 15 00.00 10 does not include any specifications for form liners. Reveal strips are detailed however, on Contract Drawings A-201, A-301, A-302, and DA502. It is our understanding that a single mock-up panel, in accordance Paragraph 1.4.4 of Section 03 30 00.00 10, for these reveal strips is required this is incorrect, please notify us via amendment. It is further requested that specifications for these reveal strips be provided by amendment.

On: Jun 05 2020.

Government Response. . The specifications will be clarified to indicate one mockup panel and to add form liner information in an upcoming amendment . On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623340 Mechanical 35 20 16.27 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The following questions are submitted on behalf of Grande Water Management System, a named manufacturer for the flushing gates specified in Section 35 20 16.27:

a. Section 2.3.g.1: Continuous PVC coated tubing is not recommended. Recommendation is for standard 3/8" O.D. rigid stainless steel 316L in 20 foot lengths with Swagelok compression fittings between each section with quick connects at the cylinders. Although semi-rigid PVC coated can be supplied it is problematic for installation. And if there is pitting in the line, you will not be able to determine where the leak is coming from and will need to replace the entire length.

b. Section 2.3.i.1: Request for chemical anchors to be allowed, Hilti HIT-RE-500 2-part epoxy anchors with threaded rods in SS-316.

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c. Section 2.3.j.5: Request for a ½" neoprene gasket to be allowed in lieu of silicon for following reasons:

1. If the silicon is not applied properly, in 4" wide beads, on a clean and dry surface, leakage may occur between the gate frame and the concrete. The gasket comes pre-installed on the gates and ready to install on the opening.

2. Concrete wall flatness and levelness tolerances. The gate is a rigid stainless-steel construction and cannot bend. This means walls need to be polished down flat with the silicon. In the case of the gasket, it is a ½" neoprene gasket which can compresses to 1/8". This allows for more flexibility regarding the concrete tolerances.

On: Jun 05 2020.

Government Response. . The specifications will be clarified in an upcoming amendment to indicate:

The hydraulic tubing will be of the rigid type, with O.D. as recommended by gate manufacturer, manufactured from Type 316 stainless steel. All couplings shall be SWAGELOK quick connec type manufactured from Type 316 stainless steel. The hydraulic tubing anchoring system, the mounting rails and support kits shall be fabricated from Type 316 stainless steel.

Adhesive anchors may be used if recommended by the gate manufacturer.

Gasket between the gate frame and the concrete wall shall be ½ inch thick, neoprene type factory-installed on the flushing gate. Gate manufacturer shall be responsible for coordinating with Contractor on any special concrete finishes or tolerances required to ensure a proper seal between the concrete wall and the gates. Contractor shall include all costs associated with any special finishes or tolerances in their base bid. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623348 Geotechnical B-100 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Contract Drawing B-100 which includes multiple existing borings and observations wells from 1971, 1973, 1973, and 1979. Please provide details of these boring and observation wells via future amendment.

On: Jun 05 2020.

Government Response. . Reference McMillan Backwash Discharge to Sewer - Phase II Geotechnical Engineering Report prepared by Jacobs and dated July 26, 2019 for additional information on previous soil boring information. This report is provided for Information only and is not considered part of the Contract Documents.

https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicFileDownload&strApp=&strPrevCob=BicCheckAllPending&strShown=McMillan-GER_07262019.pdf&intView=1 On:

Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623354 Structural S-100, S-102, S-204 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Contract Drawing S-100, S-102, S-204 which depict the overflow flumes at the Backwash Equalization Basin, but do not provide complete details or dimensions as to overall length of flume, flume slab elevation, or height of flume curb/wall. It is therefore requested that a complete profile view of each flume be provided via amendment.

On: Jun 05 2020.

Government Response. . REVISED plates 39, 45 and 46 shall be issued in an upcoming amendment. Additional information has been added to these drawings to address this question. O Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623359 Architectural A-301, A-302 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Contract Drawings A-301 and A-302 which show the AL DIAMOND SCREEN to be installed at the overflow flume wall openings. Neither specifications nor mounting details are not provided for these screens. It is our understanding that material shall be 0.032" minimum thickness Type 3003 Aluminum surface mounted to the exterior face of the concrete wall with ¼" SST post-installed mechanical anchors. If this is incorrect, please notify us via addendum and provide specifications and mounting details.

On: Jun 05 2020.

Government Response. . Refer to updated information in an upcoming amendment. The screen shall be type 304 stainless steel welded wire mesh with 2" diamond pattern square openin Reference specification Section 05 50 13 Paragraph 2.9 for a description of Stainless Steel Welded Wire Mesh, including a description of how to install the mesh. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623685 Civil DS100/Plate 21 Note 7 40 05 13 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

On sheet DS100/plate 21, Note 7 states to protect ammonia lines by encasing them in oversized ductile iron (schedule 80) protective casing. Should this be a schedule 80 PVC casing? Schedule 80 ductile iron does not exist.

On: Jun 05 2020.

Government Response. . The related note will be revised in an upcoming amendment to remove the words "schedule 80." On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623690 Contracting N/A N/A N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The local Vendor and Subcontractor Community have expressed concern with putting a bid together by the current bid date. We are asking for a two week extension to increase Vendor and Subcontractor participation.

On: Jun 05 2020.

Government Response. . The bid date will be postponed by two weeks. Official notification to bidders will be provided via amendment. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623696 Architectural A301/Plate 51 & A302/Plate 52 N/A 04 20 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

In the unit masonry Spec 04 20 00, on page 6, under section 2.2.2.2 Face Brick, there is no indication of what manufacturer of brick to use on the brick veneer on the East, West, South, and North Elevation of the Backwash Equalization Pumping Station on sheet A-301 & A-302/ Plate 51 and 52. Please clarify what manufacturer of brick the owner would like to use? Also please specify the col range of the existing brick that is to be matched on the existing filter building?

On: Jun 05 2020.

Government Response. . Any brick manufacturer can be used as long as the brick meets the specified requirements and the color matches the existing Filter Building. The existing Filter Building was built in 1981, so it is unlikely the existing brick is still manufactured. The existing Filter Building brick color will have to be field-verified. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623713 Civil 18 Note 5 03 30 00 or 32 16 19 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

On Drawing 70.24-2-18, Note 5 says to "see reference drawing 4 for information on corner stone foundations." I could not find the reference to corner stone foundation on Plate 4. Which drawing has the corner stone foundation information?

On: Jun 05 2020.

Government Response. . Refer to reference drawings provided in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623730 General G-001 REFERENCE DRAWINGS N/A

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Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

SHEET G-001/PLATE 1 Lists 6 Reference Drawings that are referenced throughout the drawings. Where can these reference drawings be found?

On: Jun 05 2020.

Government Response. . Refer to reference drawings provided in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623743 Mechanical D-101 ENLARGED DETAIL N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please provide the elevation of the Sodium Hypochlorite line tie-in as shown on sheet D-101/plate 26.

On: Jun 05 2020.

Government Response. . The existing sodium hypochlorite tie-in occurs approximately 9.0 feet above the 152.67 finished floor elevation of Equipment Area of the Chemical Building basement. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623756 Mechanical D101 307/78 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Sheet D-101/plate 26 states to use a trapeze type support (Detail 307/78) for the 1" Sodium Hypochlorite line. Is a single clevis acceptable?

On: Jun 05 2020.

Government Response. . Yes, single clevis hangers are acceptable On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623796 Contracting N/A N/A 00 72 00 - General Conditions Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Clause 52.232-16(a) reads that "Unless the Contractor requests a smaller amount, the Government will compute each progress payment as 80 percent of the Contractor's total costs...." This would mean that the contract is 20% retainage and would lead to higher costs due to having to finance the project. We respectfully request this be 5% retainage as is the industry standard. Please confirm retainage will be 5%.

On: Jun 05 2020.

Government Response. . FAR 52.232-16 is hereby removed from this solicitation. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623840 Structural S-101 and S204 Lower Plan and I/45 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The ladder (note 5) in the drain trench area on S-101/Plate 38 is noted as a stainless steel pipe ladder with extension. Section I on S-204/Plate 45 shows the ladder being under cover, without extension. Please confirm which type of ladder is required.

On: Jun 05 2020.

Government Response. . Section I on S-204/Plate 45 is not representative of the ladder area. Section H on S-203/Plate 45 provides a better representation of the ladder area. The cente backwash equalization basin bypass channel is narrower in the Section H area. Beneath the center bypass channel, the ladder will be 2'7" offset from the center wall of the basin. This will allow for a 7" offset adjacent to the center bypass channel. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8623871 Civil G-006 Foundations Note 2 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing G-006, "Foundations" Note 2 states "Excavations shall be shored to prevent subsidence or damage to adjacent existing structures, streets, utilities, etc." Please advise – does this requireme apply to all excavations? Structural, trenches, electrical manholes, etc...

On: Jun 05 2020.

Government Response. . No, this requirement does not apply to all locations. It applies to the backwash equalization basin and the associated inlet box culvert. However, the other excavations required for the project should not negatively impact or damage or impact the functionality of existing adjacent structures, streets, utilities, etc. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624685 Civil G-006 Foundations Note 4 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing G-006, "Foundations" Note 4 requires all sub grades to be "observed by a Geotechnical Engineer". Will that Engineer be provided by the Government/Design Engineer or is the contractor to provide as part of the QC Plan.

On: Jun 07 2020.

Government Response. . The geotechnical engineer will be provided by the Government. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624686 Structural G-006 Concrete Note 3 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing G-006, "Concrete" Note 3 contains the following incomplete sentence "Contractor may...of joints, subject to specified requirements." Please complete the sentence to understand the requirement.

On: Jun 07 2020.

Government Response. . Revised sentence should read: "Contractor may revise location of joints." Refer to Amendment 0003 for clarification. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624687 Civil CD-101 Sheet Key Note 1 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing CD101 (Plate 18), "Sheet Key Notes" note 1 states "Reference drawing 1 and 2 contain additional information on the extent...". Please provide these drawings or direct us to where these are included in the current contract documents.

On: Jun 07 2020.

Government Response. . Refer to reference drawings provided in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624688 Civil DS100 Sheet Key Note 4 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing DS100 (Plate 21), "Sheet Key Notes" note 4 refers to "Reference drawing number 6". Please provide these drawings or direct us to where these are included in the current contract documen

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On: Jun 07 2020.

Government Response. . Refer to reference drawings provided in Amendment 0001. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624689 Mechanical D-101 and D-102 304/78 and 307/78 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing D-101 requires the sodium hypochlorite pipe to be supported every 5'. Drawing D-102 requires these same pipes to be supported every 4'. What is the correct spacing?

On: Jun 07 2020.

Government Response. . The correct spacing is every 5'-0" which shall be clarified in Amendment 0003. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624690 Structural A-201, S-101, S-200, S-201, Section A/25, B/25, C/37, E/37 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing A-201 and S-201 indicate a mud slab is required under the EQ Pumping Station and EQ Basin Drain Trenches. Mud slabs are not shown on the structural drawings for the Backwash EQ Basins above the drain trench, the backwash waste conduit or diversion box. Please advise if mud slabs will be required in all, or specific locations or if mud slabs are elective and fall under the Contractor's means and methods.

On: Jun 07 2020.

Government Response. . On Drawings A-201 and S-201, mud slabs are only required below the Stair, Flow Meter and Control Valve Room, Weir Chamber and the Drain Trench portions the backwash equalization basin at EL 141. The mud slab is to be used as protection layer for Bentonite water proofing as shown in Architectural drawings. It is not required anywhere else.

drawing changes are required as a result of this response. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624691 Structural DS-502 Detail 126 Note 8 N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing DS502 (Plate 72), note 8 references a Type "D" Pad. A detail for this pad was not found, please advise.

On: Jun 07 2020.

Government Response. . Refer to Amendment 0003 for clarification. Type D pad does not exist and reference to it will be removed from the drawing. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624692 Specifications N/A N/A 01 00 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 32 01.00 10, section 2.1.1 indicates the Government intends to use Primavera P6 for scheduling. Specification 01 00 00, section 1.2.2 states "The Contractor will provide at least one program installation and maintenance on government hardware complete with all program and data files". Does this mean Contractors are to provide the Government with one copy of Primavera P6?

Will the Government allow the use of web-based Primavera P6 on government hardware?

On: Jun 07 2020.

Government Response. . The requirement for the Contractor to provide the Government with a copy of the software only applies if the Contractor chooses a program other than Primaver P6. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624693 Specifications N/A N/A 01 32 01 00.10 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 32 01.00 10, section 2.1.2.2 requires Contractors to provide two computers for scheduling software other than Primavera P6. Please confirm that no computers will have to be provide to the Government if Contractor intends to utilize Primavera P6.

On: Jun 07 2020.

Government Response. . Confirmed. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624694 Specifications N/A N/A 01 32 01 00.10 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 32 01.00 10, section 3.3.6.1 indicates the schedule will be manpower loaded on "if directed by the Contracting Officer". Please advise, will manpower loading be required on this project?

On: Jun 07 2020.

Government Response. . Yes, manpower loading will be required on this project. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624695 Specifications N/A N/A 01 05 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 05 00, section 1.13 defines regular working days and Monday through Friday. Given the tight project schedule, can work be regularly schedule on Saturdays to offset weather delays encountered Monday through Friday?

On: Jun 07 2020.

Government Response. . No. Weather delay days are already accounted for in the schedule and Saturday cannot be considered a regular work day. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624696 Construction Management N/A N/A 01 35 26 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 35 26, section 1.6.1.1 states "The SSHO may also serve as the Quality Control Manager. The SSHO may also serve as the Superintendent." Specification 01 45 00.00 10, section 3.

states "The CQC System Manager is assigned as CQC Manager but has the duties as project superintendent in addition to quality control." It is our assumption that one person – the superintendent will not be able to fulfill all three roles. Please advise.

On: Jun 07 2020.

Government Response. . Specification will be clarified in Amendment 0003 to indicate that "The SSHO may not serve as the Quality Control Manager but the SSHO may serve as the Superintendent." On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624697 Specifications N/A N/A 01 45 00.00 10 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 45 00.00 10, section 3.7.2 does not provide the link to the validated testing laboratories as stated at the end of the paragraph. Please provide.

On: Jun 07 2020.

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Government Response. . The U.S. Army Corps of Engineers Materials Testing Center is available at the following link: < https://mtc.erdc.dren.mil/> which shall be added to the specificati in Amendment 0003. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624698 Specifications N/A N/A 01 33 00 and 01 78 23 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 01 33 00, section 1.6.6 requires 5 copies of O&M data for review and approval. Specification 01 78 23, section 1.4 indicates the final O&M's are to be submitted in electronic format.

Please confirm that no hard copies of the final O&M's will be required or direct us to the specified requirements.

On: Jun 07 2020.

Government Response. . Confirmed, Hard copy O&M manuals are not required for the final version. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624699 Mechanical M-101 and DM-502 A/30, B/30 and 410/81 23 00 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Sheet M-101/plate 30 shows a 14" 316SST vent and references Detail 410/81. Detail 410/81 shows an aluminum duct for the gooseneck vent. Is the material aluminum or 316 SST, and if SST, what the thickness of this SST pipe? i.e. Sch 05, 10, 40

On: Jun 07 2020.

Government Response. . Sheet M-101/plate 30 shows a 14" 316SST vent and references Detail 410/81. Detail 410/81 shows an aluminum duct for the gooseneck vent. Is the material aluminum or 316 SST, and if SST, what is the thickness of this SST pipe? i.e. Sch 05, 10, 40.... On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624700 Mechanical D-102 Upper Room Plan N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Sheet D-102/plate 55 shows 18" swing check valves off of drain pumps 1-4. Sheet I-601/plate 69 shows these as ball check valves. Please confirm these are 18" swing check valves.

On: Jun 07 2020.

Government Response. . Confirmed, the 18" check valves on the discharge of the four basin drain pumps should be swing type. Clarification to the drawings will be provided in Amendme 0003 On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8624701 Mechanical D-102 Upper Room Plan 40 05 13 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 40 05 13 Table 1 shows motorized valve FV-M30-8-1 as 30". Drawing D-102/plate 55 shows this valve as 24". Please confirm 24" is the correct size.

On: Jun 07 2020.

Government Response. . Confirmed, the line should be 24". Clarification to the specifications will be provided in Amendment 0003. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625483 Contracting 00 72 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

It is our understanding that this Project is fully exempt from local sales tax. If this is incorrect. Please notify us via amendment.

On: Jun 08 2020.

Government Response. . The Government is exempt from taxes, this does not extend to Contractors. Individual States may allow an exemption but it is the contractor's responsibility to comply with all State and Local requirements. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625663 Contracting Plate 55 N/A N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing sheet 55 shows the 8" PVC drain to catch the water from the scupper downspouts and bring it into the basin to drain. Nothing is shown inside the building for it on the plan or section views.

Please advise if this piping is to turn down once it is inside the building and run down close to the floor.

On: Jun 08 2020.

Government Response. . Drawing will be clarified in Amendment 0003. No turndown of the drain pipe is required at the basin. The horizontal portion of the drain pipe shall have a center high point elevation of 161.58. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625697 Specifications N/A 25 A and B of EM 385-1-1 31 23 16 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification Section 31 23 16 Part 3.1.1. says "In addition to Section 25 A and B of EM 385-1-1 and other requirements set forth in this contract" I cannot find Sections 25 A and B of EM 385-1-1.

Please provide the appropriate Sections 25 A and 25 B.

On: Jun 08 2020.

Government Response. . EM 385-1-1 is the USACE Safety and Health Requirements. Section 25 addresses Excavation and Trenching. A copy of the manual can be downloaded from <> On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625714 Contracting Plate 29 N/A N/A Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing plate 29 shows the 30" Settled Water Diversion piping from the filter influent channel into the yard to be insulated above ground. Is this pipe to be heat traced as well? No circuit is shown fo this and nothing is discussed on the drawings for heat tracing.

On: Jun 08 2020.

Government Response. . This pipe does not require heat tracing. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625807 Contracting 00 72 00 & 01 00 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Section 00 72 00 on Page 34 of 77 of the Solicitation which states that Clause 52.232-5 – PAYMENTS UNDER FIXED-PRICE CONSTRUCTION is included by reference. This clause also referenced in Paragraph 1.3 – PAYMENTS TO CONTRACTORS in Section 01 00 00. Clause 52.232-16 – PROGRESS PAYMENTS, however, is also incorporated by full text. It is our understanding that Clause 52.232-5 shall govern with regards to payments. If this is incorrect, please notify us via amendment.

On: Jun 08 2020.

Government Response. . FAR 52.232-16 is hereby removed from this solicitation. On: Jun 15 2020

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Current Request Status: Request Closed Information for this report is procurement sensitive.

8625809 Contracting 01 05 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

5. Please refer to Paragraphs 1.15.1.1 and 1.15.1.2 of Section 01 05 00 which detail the Work at the Spent Washwater Channel and Settled Water Channels of the Existing Filter Building that must completed during the 10-Day plant shutdown that is allowed to occur between January 1, 2021 and April 30, 2021. This will require the procurement, preparation of submittals, submittal approval, fabrication and delivery of several long lead time items including Weir Gate FV-M29-1 and large diameter butterfly valves. The cumulative duration of these activities is historically 30-32 weeks for su items. With the current bid date of 6/19/20 and ninety (90) day acceptance period by the Government, Notice to Proceed may not be until 9/17/20. The corresponding 30-32 week time-frame to receiv the aforementioned items on-site would extend to the April 30, 2021 deadline. It is therefore our understanding that should the Notice to Proceed date extend past 9/17/20, the April 30, 2021 shutdow constraint shall extend day-for-day. If this is incorrect, please notify us via amendment

On: Jun 08 2020.

Government Response. . There are a series of assumptions within this inquiry that are overly conservative. Bid opening is set for the first week of July. Although the Government has 90 days for NTP, the likelihood of NTP occuring prior to the 90-day mark is high. Contractors should ensure their bids are responsible and responsive to ensure an expedited review after bid opening, and produce all required bond information and other documentation in an expedited manner. Although the construction schedule is challenging, it is achievable with appropriate scheduling and control of the work. Several manufacturers of long lead items such as weir gates and butterfly valves can produce the required items in 3 to 5 months. Accounting for the submittal preparation and approval process, the required outage window in the low demand season can be met. No assumption shall be made that the shutdown constraint of April 30, 2021 will be extended. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625862 Site CD101 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Sheet Keynote 6 of Contract Drawing CD101 which states that stockpiles, laydown areas, and construction vehicles are prohibited on the east side of the temporary access barrier outside of the limits of disturbance (LOD). No such prohibitions are contemplated for the paved areas outside the south and west sides of the LOD. It is therefore our understanding that these areas be utilized for laydown and construction vehicular traffic without restriction. If this is incorrect, please notify us via amendment.

On: Jun 08 2020.

Government Response. . Reference Amendment 0002 that clarifies the location of the stockpiles and laydown areas on revised Plate 18. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625864 Geotechnical 31 23 16 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Paragraph 3.1.2 of Specification Section 31 23 16 which states that a discharge permit must be obtained from DC Water for the disposal of surface and subsurface water. It is our understanding that this and all other permits shall be obtained by the Government and that all costs associated with such permits, including metered dewatering discharge rates, shall be paid for by t Government. If this is incorrect, please notify us via addendum.

On: Jun 08 2020.

Government Response. . Your assumption is incorrect. The Government obtains site plan approval for the project and a building permit when one is required. The Contractor will be responsible for obtaining any additional "trade permits" required by the District of Columbia or construction-related stormwater discharge permits required to complete the construction. On: J 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625865 Site CD101 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Contract Drawing CD101 which includes discrepancies on existing site feature which can be temporarily removed and/or replaced, and which must remain. Please address the followin

a. Sheet Key Note 5 indicates that the existing dated building corner stone can be temporarily removed and re-installed on a new pad. In the same area Sheet Key Note 2 allows for a portion of existing sidewalk to be removed and replaced. Sheet Keynote 4, however, requires that the existing stairs in that same are to remain and be protected during construction. The 24" EQ Backwash Dra per Contract Drawing DS100, is installed directly underneath these stairs. It is our understanding that if temporary access stairs are provided during construction and that these stairs are replaced in kind, like the pad for the building cornerstone and sidewalk, then these stairs can be removed to facilitate installation of the 24" EQ Backwash Drain. If this is incorrect, please notify us via amendme

b. On the east side of the Backwash Equalization Basin, the existing sidewalk around the flagpole foundation is to be removed and replaced. The flagpole and base are to remain and be protected. T flagpole Is within ten feet of the excavation support system and will be significant obstruction for drilling of h-piles, excavation, concrete work, and backfill. It is our understanding that if a temporary flagpole with foundation is constructed along the eastern LOD line for the Backwash Equalization Basin and a subsequent new flagpole with foundation at the current location is constructed upon completion of Backwash Equalization Basin than the existing flagpole can be removed to facilitate construction at the Backwash Equalization Basin. If this is incorrect, please notify us via amendment

On: Jun 08 2020.

Government Response. . Reference revised Plate 18 provided in Amendment 0002. Regarding sheet CD-101, Key Note 4 - Existing Stairs Adjacent to New 24" Equalized Backwash Drai The existing stairs were constructed as part of the retaining wall system that defines the elevated area located west of the Mixing Chamber. These stairs are detailed on Section 5 of Reference Drawing 3. The stair structure includes a full base slab with a bottom elevation of 162.0, two full height side walls and poured stair treads with reinforcing tied into the walls. The new 24" Equalized Backwash Drain pipe is installed nearby with invert elevation set at 162.5 +/-. While we believe that the new piping can be installed without disturbing the stair structure, Contractor can, at their no cost option, remove the stair, install a temporary stair during construction and reinstall the stair as originally designed if they consider this a better option. The adjacent retaining wall should not be disturbed. If preferred by the Contractor, the existing flag pole and associated foundation located on the east side of the new backwash equalization ba can be removed during the construction period and replaced with a new flagpole of similar height and dimensions and similar foundation at the end of the construction project provided this work is accomplished at no additional cost to the Government. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625894 Mechanical DD501 40 05 13 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please refer to Detail 301 on Contract Drawing DD501/Plate 78 which indicates for a MJ wall pipe to be installed with a flexible coupling or mechanical joint 2' from the wall, but Specification Section 05 13-3.7 states that a mechanical joint installed flush with the wall is sufficient to account for flexible joints at structures. It is our interpretation that this additional flexible joint shown in Detail 301 w not be required if a mechanical joint is installed within 2' from the wall, including flush with the wall. If this is not correct, please notify us via addendum and provide revised specifications.

On: Jun 08 2020.

Government Response. . The specification is correct. Detail 301 on Plate 78 will be modified in Amendment 0003 to delete the additional flexible joint. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625908 Mechanical S-203 and D-101 F/44 and A/54 35 20 16.27 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The gate schedule in 35 20 16.27 states for wall thimbles to be provided for FV-M29-2-1, FV-M29-2-2, and FV-M29-9. The Drawings, i.e. sheet S-203/plate 44 and sheet D-101/plate 54 don't seem to indicate the use of wall thimbles for these gates. Are F type wall thimbles required or not for these gates?

On: Jun 08 2020.

Government Response. . F-type thimbles are required for gates FV-M29-2-1, FV-M29-2-2 and FV-M29-9 as stated in the Gate schedule. Wall thimbles are not required for gates FV-29-3- THRU 6 OR FV-M29-1. Clarification to the specifications will be provided in Amendment 0003. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625934 Construction Phasing N/A N/A Solicitation Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The time allotted in the solicitation of 463 calendar days from notice to proceed to complete this project is unachievable given the limited work access and working hours. Please increase the duration for this project to be completed to 21 months.

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On: Jun 08 2020.

Government Response. . The Government disagrees with this assertion. The duration of 463 calendar days will not be increased. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8625941 Contracting N/A N/A 52 211-10 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

If additional safety measures for COVID-19 or another pandemic are instituted after the bid submission, will time be added to accommodate the delays caused by these additional measures?

On: Jun 08 2020.

Government Response. . The question is hypothetical. However, thus far USACE construction activity has and is expected to continue in a safe manner despite the COVID-19 pandemic.

events were to change to an unforeseeable condition, the contract has provisions that will allow this situation to be resolved in a fair and equitable manner. On: Jun 15 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8630225 Contracting N/A 3.2.1.2q 40 95 00 Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Spec section 40 95 00 2.3.1.2q has requirements for Special Coating: "All PLC, backplane, modules, and similar devices shall be conformal coated and rated for extreme environments." But the part numbers given in a-p are not conformal coated. Please confirm that the spec in 2q is to be the design criteria.

On: Jun 09 2020.

Government Response. . Confirmed, the conformal coating is required. Clarification to the specifications will be provided in Amendment 0003. On: Jun 26 2020 Current Request Status: Request Closed

Information for this report is procurement sensitive.

8630422 Contracting Plate 50 N/A N/A Comment Classification: Unclassified\\For…