6923G521R0002A00004.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE PAGE OF PAGES

1 3

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X) 9A. AMENDMENT OF SOLICITATION NUMBER

6923G521R0002

9B. DATED (SEE ITEM 11)

10/02/2020

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

CODE FACILITY CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

6923G521R0002A00004 11/04/2020

6. ISSUED BY CODE 7. ADMINISTERED BY (If other than Item 6) CODE

SLS Contracting Office 180 Andrews Street Massena, NY 13662, US

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

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

Offers 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 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or electronic communication 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 letter or electronic communication, provided each letter or electronic communication 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 NUMBER AS DESCRIBED IN ITEM 14.

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

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, 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.)

This amendment serves to include questions asked by prospective offerors and the answers provided by the Contracting Officer’s Representative.

Continued on Pages 2 and 3 (Q &A) 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) 16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

16C. DATE SIGNED

Previous edition unusable STANDARD FORM 30 (REV. 11/2016) Prescribed by GSA FAR (48 CFR) 53.243

SLS Eisenhower Lock Concrete Diffusers 6923G521R0002A00004

(Questions and Answers)

1. Q: Part III, Section J, List of Attachments states: “The SLSDC can also provide original existing diffuser contractor shop drawings showing concrete pours and reinforcing steel to the Contractor upon request. “ Kindly provide these documents to us in electronic format, (pdf).

A: These documents will be provided upon award. The basic documents indicating the design parameters of the existing diffusers are part of the solicitation package and are expected to be sufficient to develop a Phase Two proposal.

2. Q: Please provide any other drawings or information available which may be relevant to this solicitation.

A: The basic documents in the solicitation package have enough information to develop a Phase Two proposal. Additional original contractor drawings showing existing reinforcement and the concrete pours will be made available upon award.

3. Q: Part I, Section C discusses the need for dewatering as follows: “The SLSDC cannot fully dewater the diffuser work area. Additionally, water will infiltrate into the dewatered areas.

Water levels will fluctuate to as much as approximately 2-feet in the work area. Therefore, the Contractor must provide means to manage water in the work area as needed.” Please identify the elevation of the invert of the dewatering pump pit adjacent to the diffuser area at the North wall and confirm that this pit is suitable for use as a dewatering pump station for the diffuser area. Please identify if there are existing pumps in this location. If so, please indicate their size and capacity, if they are in working order, and if they may be used by the design-build contractor during the performance of this contract.

A: Two additional reference drawings are included. Those drawing numbers are 326-CSG-36/1 and 326-C-20/25. The first drawing shows in Section A-A that there is a 12” cast iron pipe with an invert elevation at the north chamber wall being 152.00’ which is the diffuser pit’s floor elevation (USLS 1935 datum). The purpose of this pipe is to drain the diffuser floor area to the dewatering pit. The location of the pipe is at station 952.838 as noted in the same detail. The second drawing shows that this station is between the fifth and sixth downstream most diffuser laterals.

The SLSDC has three pumps used to dewater and maintain water levels to a certain extent. SLSDC will continue to operate its pumps, but even so, there will be fluctuation in water levels above the diffuser floor elevation due to cycling and set points of these pumps. The amount of variation above the floor level is largely a factor of seepage past the downstream stoplogs and the ability for flow through of the 12” drain pipe. Recent efforts to reduce seepage past the stoplogs has kept the rise above floor level to a minimum. However, this has exceeded 2-feet in the past. Therefore, we recommend that the Contractor make provisions to temporarily dam off at least 4-feet (note this is a change from the 2-feet mentioned above) in areas desired to be dewatered, and immediately clear any debris or sediment obstructing flow to the 12” drain pipe after the initial dewatering. The Contractor shall at all times keep the drainage of the 12” pipe unobstructed from demolition debris or any other kind of debris.

The Contractor will still be responsible for pumping the water out of their work area they desire to be fully dewatered. The Contractor can utilize this 12” drain pipe to in effect divert it to the dewatering pit where it will be discharged by SLSDC to the river. This water must not contain any pollutants or sediment that cannot be discharged to the river.

SLS Eisenhower Lock Concrete Diffusers 6923G521R0002A00004

4. Q: Please identify any other pits or sumps that may serve for temporary pump location to assist in dewatering the diffuser area.

A: There are no sumps or pits in the vicinity.

5. Q: Please identify the expected sources of the water infiltration in the diffuser work area, (upstream through the miter gates, downstream from the stop logs, from the emptying culverts, all of these?)

A: Once the lock is dewatered to the point where the filling and emptying ports are uncovered, the primary source of water infiltration is leakage between and around the stoplog temporary closures at each end of the lock. Leakage from the upstream stoplogs flows down the filling and emptying culverts and then enters the work area though the diffusers. Leakage from the downstream stoplogs comes in over the stoplog sill. Water can also come in from rain or snow.

6. Q: Please let us know if temporary dam structures across the lock channel slab at locations upstream and downstream from the diffuser area pit would be of assistance in controlling water infiltration into the diffuser area.

A: Please see the answer to the previous question. The stoplog structures are the temporary dam structures. As noted they do not completely prevent infiltration. No other damming system exists. However, it is conceivable that a temporary damming structure could be implemented by the Contractor to limit water in a work area inside of the of the stoplogs.

7. Q: Please identify if the SLSDC’s temporary lock covers are available and suitable for covering the diffuser area during the performance of the work of this solicitation.

A: The SLSDC has not maintained or inspected the majority of the lock covers for an extended period. It is unknown if they are safe to use and the assumption would be they are not.

8. Q: Please identify the proposed location of the concrete spoils area at the North side of the lock.

Provide a haul distance if possible or identify the location on the site map provided with the Phase II documents.

A: The attached site map shows the general location of the concrete spoils area north of Eisenhower Lock.

(Questions and Answers)