Amendment 0004.pdf

USACE, CONTRACTING DIVISION

ATTN: CEMVN-CT, ROOM 172

7400 LEAKE AVE.

NEW ORLEANS LA 70118-3651

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

The above numbered solicitation for West Shore Lake Pontchartrain, Louisiana Hurricane and Storm Damage Risk Reduction Project, WSLP-114, Reserve Relief & I-55 Pump station and Drainage Structures, is hereby amended as follow s:

- Bid opening date w ill be re-established in a forthcomming amendment.

- Additional questions resulting ONLY from the information provided in this amendment w ill be accepted and are due by 27 May 2025 at 9:00 am CST. Questions not applicable to this amendment w ill not be accepted.

- Provide answ ers to contractor’s questions.

- Provide updates to specif ications and draw ings.

1. CONTRACT ID CODE PAGE OF PAGES

1 39

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

16C. DATE SIGNED

BY 20-May-2025

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 W912P825B0024

X 9B. DATED (SEE ITEM 11)

27-Feb-2025

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 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 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

19-May-2025

CODE

CONTRACTING DIV- CHIEF

7400 LEAKE AVENUE, ROOM 172

NEW ORLEANS LA 70118-3651

W912P8 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE W912P8

FACILITY CODECODE

EMAIL:TEL:

W912P825B0024

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION SF 30 - SF 30 CONTINUATION

The required response date/time 28-Apr-2025 10:00 AM has been deleted.

The following have been added by full text:

QUESTIONS AND ANSWERS 2

WSLP-114 Questions (Round 2) Question 1: To increase the length of sheets, is it acceptable to increase the interior distance between the TRS sheets by moving them to the outside of the I55 bridge piles, to allow the sheet pile TIP elevation to be deeper and still maintain a 5’ clearance between the battered pipe piles?

Answer: No, this is not acceptable.

Question 2: Per drawing 3S-151, the fender connection section calls for "1"Ø GUARDRAIL DOME HEAD BOLT W/ O.G WASHER AND DOUBLE HEX NUT, GALVANIZE (TYP.)". Per specification "SECTION 35 59 13.00 12 POLYMERIC (FIBERGLASS REINFORCED) FENDERS", it calls for Bolts, Nuts, and Washers to be "ASTM F593 or ASTM F594, Group 2 (316 alloy) stainless steel for nuts and bolts. ASTM F844 for washers, except fabricate washers of 316 alloy stainless steel.". Please Clarify.

Answer: See drawing revisions in amendment. The dome head bolts with O.G washers and Double Hex Nuts shall be 316 SS.

Question 3: Per drawing 2S-380, Detail F16 DEBRIS BARRIER TO INTAKE WALL CABLE ATTACHMENT SECTION, it calls for 3/4" stainless steel cable, clamps, and shackles. Per specification "SECTION 35 31 20 FLOATING TRASH BARRIER", it calls for cable to be 1/2" and shackles to be hot dipped galvanized. Please clarify.

Answer: See specification and drawing revisions in amendment.

Question 4: Requesting approval for Submar's 8'X20'X12" articulating concrete mattress, which is identical to the mattress shown in the project plans. There is currently no hydraulic stability or flume study on this mattress. Could this requirement be waived, as this study would be expensive for the small amount of material that is needed for this project.

Answer: No, requirements shall not be waived. Requirements within the specifications must be adhered to.

Question 5: Requesting approval for Submar's 8'X20'X12" articulating concrete mattress, which is identical to the mattress shown in the project plans. There is currently no hydraulic stability or flume study on this mattress. Could this requirement be waived, as this study would be expensive for the small amount of material that is needed for this project.

Answer: No, requirements shall not be waived. Requirements within the specifications must be adhered to.

Question 6: Will the bypass road shown on the West side of Highway 51 be completed prior to the start of this project?

Answer: No. See specification and drawing revisions in amendment Question 7: Will the adjacent T-Wall be completed prior to the start of the project on the East side of Monolith 3- 6E?

Answer: No. See specification and drawing revisions in amendment

Question 8: Specification 31 62 14.01 12 states the contractor must retain the services of the pile testing firm for PDA testing. Specification 31 62 13.04 12 Section 2.5 implies that the Government will provide all equipment necessary for PDA testing. Please clarify if the Government will also retain the services of a test lab? Does this pertain to only the 66”-cylinder piles?

Answer: The Government will not provide equipment for PDA testing. The sentence in 31 62 13.04 12 will be deleted by amendment.

Question 9: Specification 31 62 13.20 section 1.7.4 states that contractor shall hire a geotechnical engineer to observe production pile installation. Can you please confirm if all piling on the project shall be observed by a geotechnical engineer, or if only precast/prestressed concrete piles?

Answer: Pile driving does not need to be observed by a Geotechnical Engineer. The paragraph in 31 62 13.20 will be deleted by amendment.

Question 10: Could you please identify a pile testing schedule indicating what pile types require PDA testing, frequency of testing (initial drives, 24 hours restrike, 7 day restrike, etc.).

Answer: See specification and drawing revisions in amendment. PDA is only required for 66”-cylinder piles and tank farm piles.

Question 11: Drawing 0CF503, Note 3, references 1CF405, 1CF407, 4CF405 and 4CF407. I am unable to find these drawings. Please provide.

Answer: See drawing revisions correcting references. The referenced drawings should be "2CF405, 2CF407 AND

3CF405".

Question 12: Specification Section 31 62 13.04 12, section 3.9 calls for a precast cap. Please clarify if the braced floodwall cap is precast or cast-in-place.

Answer: Cap should be cast-in-place. See specification revision in amendment.

Question 13: Per bit item "0076, Flow Training Walls", it calls for 12" square concrete piles. Can we quote 14" square concrete piles instead of 12" square concrete piles? Our pile suppliers no longer make 12" square concrete piles.

Answer: Yes, but Contractor is responsible for any changes to hardware to attach fendering to pile. Bolt holes through piles will still be full penetration.

Question 14: If the bypass road between I-55 and Hwy. 51 is not installed prior to the start of this project, would it be acceptable for us to clear the area within the right of way between Hwy. 51 and I-55?

Answer: Yes, Any activity in this area shall be coordinated with the ACO as to not interfere with adjacent contractors.

Question 15: Per drawing 0S-152 / Detail E7, it calls for backing rings to be 5/16" thick. Per specification "SECTION 31 62 17.00 12 STEEL PIPE PILES", it calls for backing rings to be 3/8" thick. Please clarify.

Answer: Use 3/8" backing rings. See drawing revisions in amendment.

Question 16: Drawing 2C-103, detail K5 depicts sand fill from elevation (-)3.0 up to preload elevation.

Embankment specification 31 24 00.00 12, paragraph 1.8.1 states that preload embankment shall be constructed of earth material. Please confirm if the preload embankment pay item 0060 shall be sand per the detail, or clay.

Answer: Preload Embankment bid items are to be clay fill. Preload sand quantities are included in the Sand Fill base bid items.

Question 17: Will the 3' excavation required at the wick drain and preload areas be paid for in the Clearing and Grubbing pay items?

Answer: Yes, it will be paid for as part of the clearing and grubbing bid items.

Question 18: Will the sand fill that is required to replace the 3' excavated area above be paid for in the Sand Fill Base pay item, or Preload Embankment pay item?

Answer: The sand is paid for in the Sand Fill Base bid items.

Question 19: Please confirm that all Piezometers and Inclinometers are to be supplied, installed, and monitored by others? Is contractor only responsible for supplying, installing, and monitoring of settlement plates?

Answer: "T-wall/Levee instrumentation and monitoring are to be performed by others. Operations/Parking area instrumentation and monitoring are to be performed by the contractor."

Question 20: Do the bid quantities for embankment/sand fill include the re-use of the preload embankment material?

Or should this be the additional material required for the remaining embankment?

Answer: No, the re-use of levee preload material is not included in the embankment material bid item. However, levee preload material may be used in the remaining embankment construction.

Question 21: Is it the intent for all of the preload embankment material to be used as embankment/sand fill, or shall be hauled off?

Answer: "Removed preload material may be used in the remaining embankment construction. " Question 22: Embankment specification section 31 24 00.00 12 paragraph 1.4.1 states "Price and payment shall constitute full compensation for all plant, labor, equipment and material (except earth material)." Please clarify if materials are not expected to be paid in this bid item.

Answer: The phrase "(except earth material)" shall be removed. See specifcation revisions in amendment.

Question 23: Spec Section 31 73 00 Section 1.7 Test Program – What will be the verification of each test section column diameter? Is full length core samples expected for each test section (each pair of Jet Grout columns) to verify geometry or will alternate methods be accepted?

Answer: The jet grouting test program is conducted prior to production work for the contractor to demonstrate a workable means, methods and procedures is confirmed prior to production work. The required parameters to be evaluated are listed in the test program section of the specification. The contractor shall propose for approval a work plan that includes required verification procedures.

Question 24: Spec Section 31 73 00 Section 2.2.1 states that the unconfined compressive strength of solidified grout shall range between 300psi and 1000psi. Is this the minimum and maximum ranges allowed for the in-situ soilcrete from the Jet Grouting process or is it referring to the grout used for the Jet Grouting?

Answer: It is referring to the grout used for jet grouting.

Question 25: We don’t see any ranges or requirements around the instrumentation required for this project. Is someone going to provide more details so we can accurate quote the instruments below?

Answer: See instrumentation list added to end of section 40 95 00. See specification revisions in amendment.

Question 26: Sheet 0MH102 shows PRD 20-23 but these are not listed in the PRD schedule on sheet 0MH605.

What size are these pressure relief dampers? There is no specification for these dampers.

Answer: Each of PRD-20,21,22,23 is 24"x24". See specification revisions in amendment.

Question 27: Sheet 0HM102 show BDD 10 and BDD 11 and these are not listed in the BDD schedule on sheet 0MH605. We are assuming these are 60”x60”, please confirm. There is no specification for these dampers.

Answer: Each of BDD 10&11 is 60"x60". See specification revisions in amendment.

Question 28: There are several louvers that are listed with separate louver numbers but are shown mounted either side by side or above and below each other. For example, LV-22 and LV-23 as well as LV-11 and LV-12. The manufacturers installation instructions do not allow louvers to simply butt together, a structural steel support, provided by others, is required to maintain the wind load rating.

Answer: "Correct. Structural support is required for louvers that are mounted side by side or below each other. Pre-engineered metal building manufacturer shall provide the required framing for the louvers."

Question 29: Louvers LV-8-LV-10 are too large, no manufacturer makes a hurricane rated louver taller than 144”.

These three louvers will have to be split into two separate louvers (6 total). Please provide revised louver sizes.

Answer: "Each of louver’s LV-8,9&10 to be split into 4 smaller louvers. The split louvers will be called on updated drawings as follows: LV-8 becomes LV-8A,8B,8C,8D. (Similar for LV-9 & 10). Each louver size is: 78""W x 96""H. See drawing revisions in amendment" Question 30: Will all three pump generator be running at the same time? If so, the total exhaust cfm exceeds the total intake cfm.

Answer: "All the pump engines can operate simultaneously. The airflow on intake louvers will be adjusted on the schedules to match the exhaust amount. Louvers dimensions will remain the same. See drawing revisions in amendment."

Question 31: LV-17 and LV-18 are scheduled as 132”x120” at 79,000 cfm each. The free area velocity is incorrectly shown as 849 fpm. These louvers are too small for this intake volume, the free area velocity is greater than the break water penetration velocity for the louver. These louvers will pull in rain at the given cfm. The pressure drop through these louvers would also be close to 0.534” sp. What is the correct cfm for these louvers?

Answer: Schedule will be updated. The correct airflow on these louvers will be approx. 50000 cfm. See drawing revisions in amendment.

Question 32: We are selecting the Greenheck EHH-601D model louvers. We have noticed that pressure drops through them are on the higher side. Our free area and free area velocity is different than scheduled but the scheduled values cannot be verified without knowing the manufacturer the performance is based on. If the louver static pressure loss is included in the fan static pressure then we are good, but if not changes should be made. Below is a chart of the larger louvers with their calculated pressure drops as we selected them. Please note, that in order for some of the louvers to meet the minimum 120 psf minimum requirement, they had to be split into more sections.

Increasing the number of sections lowers the free area and increases the pressure drop.

Answer: "Louver performance is based on Ruskin, model EME520MD. Split louvers will require a larger wall opening and they will not have a smaller combined free area. (the percentage of free area remains the same for almost all sizes). Pressure loss of 0.25 in wc was considered for the intake louvers and hurricane louvers with that amount of pressure drop or less is acceptable."

Question 33: Are these truly IMP? If single skin panel with batt insulation is an interior liner panel required? What is the height?

Answer: "Yes, the wall panels were designed as IMPs. The single skin metal panel application does not meet continuous insulation requirements. The answer to the additional markups on detail F10 submitted with this question is: The Nucor CFR roof panel type is not an equal to the standing seam roof panel type. This would be a substitution or alternative if submitted for review during construction. The metal roof deck is galvanized."

Question 34: A nested portal frame will be required for structural bracing of PEMB. See below sketch on 0S-106.

The concrete pilasters will need to be increased in size to accommodate. Please confirm this is taken into consideration Answer: "Pilaster sizes are set due to doorways, equipment clashes, and minimum clearances. Expectation is that the pilasters can accommodate a portal frame or cross bracing could be added to the end bay at column lines 7 and 8 or some other means of lateral bracing. The answer to the additional markups submitted with this question is: The Contractor is to coordinate the design of the metal building with the PEMB manufacturer based on the plans and specs and once the final equipment and material selections are made to verify weights/geometries. Based on the provided dimensions and elevations on 0S-305, the minimum clear height under the rafter is 7'-0"". " Question 35: Regarding the proposed fire pump, please confirm that the size is correctly stated as 50 GPM at 55 psi.

This is an usually small fire pump flow rate, and it may not be sufficient to supply the fire sprinkler system demand.

Answer: Pump size is correct. The fire pump only serves two small areas: the fire pump room and the control room.

Question 36: The head detail of detail B16 on drawing A-509 shows a motor operated Overhead Door. However, the specifications call for a manual operator. Confirm if the overhead door should be motor operated or manual operated.

Answer: The overhead door should be manually operated per specification 08 33 23. See drawing revisions in amendment.

Question 37: Amendment 2, question 86 answer states that Louver material and finish are to be per 23 00 00 para.

2.4.1, which calls for the louvers to be mill finish. The amendment also states that the louvers are to be factory painted. Confirm how the aluminum louvers are to be factory painted. Should they have an anodized coating?

Answer: Anodized coating is acceptable Question 38: Drawing 0M-407 calls for Pipe Bending, 2” dia. X 30” long pipe bending for the two FOS lines and a 2 ½” dia x 30” long pipe bending for the OFDT line. What is this pipe bending to be made of? Can you provide a specification? Is this just the SS08 tubing/hose bent a small amount? The detail on 0M-550 shows a pipe bending detail, but that is much longer than 30”. The 2 ½” pipe is double containment stainless steel hard pipe. Provide a specification for the 30” pipe bending piece for this 2 ½” pipe Answer: For FOS and OFDT 'Pipe Bending' lines, please provide SS08 tubing/hose per Pipe Schedule and Section 33 52 40. Provide bending section overall length ~30" as indicated with sufficient extra length of the hose to accommodate up to 6" settlement.

Question 39: Drawing 0M-550 details C12 and C17 show 4” ducting on the pipe coming from underground. Is this ducting on all of the underground piping, or just at this location where it turns up? We do not see this ducting required in the specification.

Answer: 4" ducting is required on complete length of belowground piping (i.e., from the transition sump TS 630 to the pump house transition). Refer to notes on drawings 2M-130 area G7 and 0M-608 area D3.

Question 40: Drawing C503 shows a 36’ opening for the Fence Sliding Gate. The roadway is 24’ wide. Confirm that a 36’ gate is the correct size for this gate.

Answer: Gate size will be reduced to 24'. See drawing revisions in amendment.

Question 41: Specification 32 31 13 para. 2.1 states the fence fabric height is to be 96” (8’-0”). The elevation view of the sliding gate shows the fabric to be 7’-0” height. Confirm the height of the fence fabric.

Answer: Fence fabric will be 7'-0". See specification reivision in amendment.

Question 42: Specification 22 07 19.00 40 discusses Plumbing Piping Insulation. Specification Section 23 07 00 discusses insulation for mechanical systems, and describes some plumbing piping in this section as well. Drawing 0M-002 Keynote D states that Piping with an “*” shall be insulated, and the only lines that have an * are the engine exhaust and refrigerant lines. It is not clear which pipelines get insulation and which pipelines do not. Please provide a list of all pipelines that need to be insulated, so that there is no confusion.

Answer: Please provide insulation for engine exhaust and refrigerant lines as indicated in Pipe Abbreviations and Function Schedule on sheet 0M-002.

Question 43: Specification 41 65 10.00 10 para. 2.9.3 states that the exhaust piping, mufflers, and silencers shall be insulated with calcium silicate insulation with aluminum jacket. Typically the silencer and piping on the exterior of the building is not insulated. Confirm that the silencer and piping on the exterior of the building are to be insulated as described in the specification.

Answer: No insulation is required on the exterior exhaust piping and silencer. Please refer to Dwg 0M-510. See specification revision in amendment.

Question 44: Amendment+0002 changed the estimated quantity of Items 91, 92, 93, 94, 95, and 96. All these items are related to the surfacing quantity's for the proposed access roads and parking lot areas. Based on the limits and section depths shown in the original solicitation documents, it appears Addendum+0002 changed the section depths for the surfacing areas or modified the surface area limits, however no additional information was provided. Please clarify what necessitated the increase in quantity for these items.

Answer: Amendment 0002 revised quantities which were not included in the original bid documents. The quantities now reflect what is shown on the drawings.

Question 45: Both Pump station sites have limited areas for store fluid and solids onsite for disposal. Are the decontamination requirements required, or was that spec (33 20 00) requirement in place if hazardous materials were found on site?

Answer: There has been no hazardous material identified on site to-date. Section 3.2.1 and 3.2.2 are for the cleaning of the well driller's equipment.

Question 46: Based on experiences in the area, the wells could approach 1000ft in depth. This will require large drill rigs and large laydown areas. What is the depth that the Corp is expecting water to be located at?

Answer: Water is expected to be located at approximately 600 ft. See revisions to specification in amendment.

Question 47: In spec section 33 20 00, the types of soil in the area could result in frequent replacement of pumps and screens because of corrosion. Will the Corp be willing to assume responsibility for the future maintenance and replacement of the well materials that are a result of the corrosive soils?

Answer: Maintenance will be required for the pumps, screens, etc. as part of the long term maintenance of the project to be provided by the local sponsor.

Question 48: In spec section 33 20 00, section 2.1.1 states that the casing shall be 6” diameter, but the next section states that the screen shall be 8”. An 8” screen cannot fit through a 6” casing. Is a two piece screen or casing required?

Answer: The casing shall be 8". See revisions to specification in amendment.

Question 49: Well drillers in the area typically use PVC casings. Can the specs (33 20 00) be revised to allow PVC or other materials in lieu of stainless steel?

Answer: No, stainless steel is required. See revisions to specification in amendment.

Question 50: In spec section 33 20 00, section 2.4 states a bentonite seal. Bentonite seals are mainly used for domestic wells in Louisiana. Louisiana Administrative Code Title 56 requires this to be completed as an industrial well since it’s used for cooling purposes. This would require full depth cement. Is full depth cement required?

Answer: Yes, full depth cement is required. See revisions to specification in amendment.

Question 51: In spec section 33 20 00, section 2.6 states a 460V motor is required for the pumps. However, with the low flow and low head requirements of the pumps 230V pumps are the only ones available on the market that meet the specs. Will 230V pumps be acceptable?

Answer: Yes, 230V pumps are acceptable. See revisions to specification in amendment.

Question 52: These wells are in a flood prone area, which will require the well seals to be located at least 2’ above basic flood elevation. What is the basic flood elevation considered for the site?

Answer: I-55 BFE is El. 11.0 and Reserve BFE is El. 5.0.

Question 53: Is the 20 years of experience required for the well driller based on company existence or the experience of the company head? Many of the well drillers in the area are sole proprietors and have been in business for less than 20 years but have at least 20 years of experience.

Answer: The driller must have 20 years’ experience, not necessarily the company itself.

Question 54: Will impact hammers be allowed for under and/or adjacent to the I-55 bridge for pile driving operations?

Answer: Yes Question 55: Does the 2-foot mass concrete requirement apply to the floodwalls and mechanical building or only the pump station building?

Answer: It applies to all concrete.

Question 56: Details B2 on 3S-515 and detail A2 on 3S-516 depict the connection fabrication for the braced wall that connects the 66’ cylinder piles and the permanent cutoff wall at the pump station on one end, and the flood wall on the other end. Please describe an installation sequence for this fabrication, the TRS on either end, the permanent cutoff sheets on either end and the 66’ cylinder piles.

Answer: The fabricated section with the slotted connection tube and the cutoff sheetpile starter is installed as part of the TRS and the permanent cutoff is connected prior to concrete placement, similar to or same as typical cutoff continuation to TRS connection construction sequence. The connection to the braced wall is added when the wall is installed.

Question 57: The channel on the I55 pump station cannot be completely closed until the drainage structure is functional. The Details B2 on 3S-515 and detail A2 on 3S-516 depict the end points of the braced wall that will close the channel. The components in these details must be installed when the sheet pile cutoff wall and the TRS are installed. Please verify the above assumptions.

Answer: The components welded to the fabrication are installed as part of the TRS.

Question 58: Question No. 101 and its response from Addenda 2 discuss mass concrete for the 5,000 and 9,000 psi mixes. Can you please confirm whether this strength requirement will be based upon 28 or 56 days Answer: Strength requirement will be based upon 28 days. Please see Specification 03 31 00.00 12 Para. 1.7.1.

Question 59: Section 01 53 00.02 12, paragraph 1.8.3 states, “The design of the sheet pile wall shall be developed using a method of analysis indicated in paragraph "Design Procedures". The soil properties used shall be those presented on the drawings and in the figure(s) attached at the end of this section.” The design criteria at the end of the section that the USACE states SHALL be used for design has a disclaimer stating, “The soil profiles included in the specifications are subjective and are partially based on engineering judgement, experience of the design engineers, and design of the completed project features. The Contractor shall make an independent interpretation of subsoil conditions at the site and perform their own engineering calculations and design considering how they may impact the various stages of construction, construction loading conditions, and their means and methods.”Are the soil profiles provided by USACE to be used in design of the temporary retaining structures or is the contractor responsible for their own geotechnical design data?

Answer: The contractor is responsible for their own interpretation of the geotechnical data for design of the TRS.

See revised section 01 53 00.02 12 in amendment 2.

Question 60: Drawing 3S-390 shows a cross section through the T Wall beneath the I-55 Southbound bridge, and drawing 3S-390A shows the same cross section through the T Wall beneath the I-55 Northbound bridge. Both have a suggested construction sequence, that begin with installing the sheet pile cutoff wall, then driving the 24” foundation pile and completing by installing the TRS and excavating. Please provide more information regarding the equipment and methodologies used with that suggested construction sequence.

Answer: "It is not required to drive the sheet pile cut-off wall first. This is presented as a suggested sequence only.

The TRS may be driven first, provided any struts used with the TRS do not prohibit installation of the sheet pile cut-off wall or driving the permanent floodwall piles. It is understood that all work will be from a floating platform, working within the limited headroom."

Question 61: Section 35 45 01 Vertical Pumps, Axial Flow and Mixed Flow Impeller Type, Para 2.1.1 Design Requirements, Sub Para. F notes.Since the entire pump unit major components are required to be 316 Stainless Steel per the applicable contract plans and specifications ( see below).and per the response provided by the USACE via amendment#2 dated April 25, 2025, question #98 ( see below). none of the internal components require coatings, is the requirement for a cathodic protection system applicable?The last sentence of paragraph f. clearly states that a cathodic protection system is required “to address corrosion and to maintain a uniform design life of the pump”.

Since the specification clearly prescribed a requirement of a cathodic protection system, we are asking that the design criteria be clearly spelled out as to what is being required and what are the specific parameters that need to be addressed in the development of the cathodic protection system. Upon review of the applicable references included in Paragraph 1.3 of the same specification which we assume would be related to this design requirement, we cannot find any specific guidelines, specific parameters, methods, suggested materials, is the requirement for an active or passive system, or references that need to be followed in the development of the analysis that is being required via Paragraph f above. Can you please provide a specific set of design parameters that are to be followed in the development of this design and provide some sort of sample report as to all that is be considered in the design including example calculations and the format of such a report or refer a specific specification that the pump supplier can look to for guidance to adhere to this contract requirement as the Cathodic Protection guidelines provided via the applicable USACE EM documents does not provide such guidance relative to such an analysis on pumping equipment systems.The cathodic protection design guidelines provided via the applicable USACE EM documents do not provide specific guidance relative to such an analysis on pumping equipment systems and therefore this requirement is vague and ambiguous and therefore difficult to develop a costs and work scope based upon the existing contract language.

Answer: Based on the pump current design – stainless steel for all wetted components with no dissimilar metals – the cathodic protection is not required. See revisions to specifcation in amendment.

Question 62: Note 18, C-001 States the following.Can clarify or confirm that this vibration monitoring is to be performed for all site activities and specifically all pile driving activities on the entire site. Is there any distance limitation from the I-55 bridge structure(s) themselves? Also, the language includes limits on particle velocities that are different that that included is the Special Conditions, Para 25 (a) ( See below).

Answer: Vibration Monitoring is to be performed for all activities on site that may create vibration. See Specification 01100 Items 25 and 26 for instructions on vibration monitoring. Note 18, Sheet C-001 has been changed to reference 01100 Items 25 and 26. See drawing revision in amendment.

Question 63: Utilities, Note 3, C-001 States the following: Can you explain how the contractor is to verify all locations and elevations of existing underground utilities on anything that is not shown on the contract drawings?

Answer: It is the Contractors responsibility to verify all known utilities and take all procautions possible to identify and protect unknown utilities. Such as calling 811, etc.

Question 64: OCF503, Note 6, States “ TREE STUMPS TP BE REMOVED AT WICK DRAINS 5’(MIN.).Dwg 2C-103 Note 1 Says CLEAR & GRUB TO ELEV. -3.0. Can you confirm how deep you to assume excavation is required to remove the stumps as the wick drains?

Answer: Note 6 States: Tree Stumps to be removed at Wick Drains. The "5' (min)" is part of the Section C detail to the left of the Notes.

Question 65: 2C-103, Note 7 & 3C-103, Note 7 both state “ BEGIN APPROXIMATELY 6 MONTH WAITING

PERIOD….ACTUAL WAIT PERIOD IS BASED ON INSTRUMENT READINGS AND SUFFICIENT

COMPLETION OF CONSOLIDATION AND WILL BE DETERMINED BY ENGINEER”. Since this is critical path work to the projects ( RCC & I-55), can the contractor assume 6 months in the development of its proposal and any time more will be granted along with applicable FOOH costs?

Answer: Six months can be used for scheduling purposes. If the Government causes a delay to the critical path, it will be handled under the “Changes” Clause Question 66: 3C-102, Note 4 states “ DURING CONSTRUCTION OF WSLP-103 PROJECT, ACCESS FROM US-51 WILL BE LIMITED. Can you further define the timetable being referred to and what is meant by limited?

Answer: Clarification of the order of work in the area is provided via amendment. Access and activities between I- 55 and Hwy. 51 shall be coordinated with the ACO as to not interfere with WSLP-103 Contractor.

Question 67: 2S-140, 2S-141, 2S-625 & 2S-624 – Can you confirm there is no conflict between the installation of the 30” steel batter piles at the Wingwall and the concrete piling at the West Access Ramp Bent Caps?

Answer: Confirmed. There are no conflicts between the wingwall batter piles and the concrete piles supporting the access ramps.

Question 68: Looking at the proposed TRS layout on the pump station/drainage structure and the proposed braced wall connection to the drainage structure, it appears that the TRS members, which are required to be cutoff and left in-place will create a conflict at this location. We have attached the applicable details for reference. We realize the design of the TRS is the contractors contractual design responsibility but with the given layout and the details we are to follow with the connection and the local and size of the TRS components, can you please confirm or clarify what is proposed at this location will work?

Answer: The TRS has to be detailed to fit the location of the permanent brace wall connection detail section. Special modified or fabricated TRS joining sections may be required. The portion of the TRS joining pieces will be cut and removed same as the other TRS pieces without damage to the brace wall connection fabrication.

(End of Summary of Changes)

SECTION 01100

Page 34. Insert the following new paragraphs to the end of this section, as follows:

“36. WEB CAMERAS

The Contractor shall install a webcam high-definition professional-grade, digital construction camera system to monitor construction progress. The system shall be equipped with a standard interface for viewing jobsite images with a calendar-based navigation system, online time-lapsed playback and interactive slideshow capabilities. It shall be capable of transmitting still shots every 15 minutes 24 hours per day. The data collected from the system shall be stored for the duration of the project and readily accessible for the Government’s future viewing. The Contractor shall install the cameras on poles under the direction of the Contracting Officer at both ends and the center of each work site (Reserve and I-55). The cameras shall meet the following minimum requirements:

(1) Three (3) cameras per work site, 4MP resolution with zoom capabilities

(2) Wireless Ethernet Connection

(3) 12V DC Solar Power

(4) Weatherproof outdoor enclosure with wall mountable arm

There will be no separate measurement for these items and the costs shall be distributed throughout the existing bid items. Price and payment shall constitute fill compensation for furnishing all labor, materials, and equipment for providing and servicing the web camera system for the duration of the contract.”

37. COORDINATION WITH OTHER GOVERNMENT CONTRACTORS

(1) The Contractor shall coordinate with the adjoining Government Contractors and allow vehicular and equipment access from Access Road “F”, culvert crossing, and thru the eastern portion of the Reserve Relief levee work site to the eastern adjoining project levee and floodwall construction.

(2) The Government Contractor performing the work past the west side of the Reserve Relief levee work site will not be allowed access into the Reserve Relief work site.

(3) The Contractor shall coordinate with the adjoining Government Contractor and allow vehicular and equipment access from Access Road “P” thru the western portion of the I- 55 levee work site to the western adjoining project levee and floodwall construction.

(4) Access to the eastern portion of the I-55 work site shall be restricted between baseline stations 770+00 to the eastern limit of work at Station 771+00 (East of I-55 bridges) to allow for the adjoining Government Contractor to construct and complete the tie in T-wall and construct and remove of the temporary bypass road and drainage canal as shown. However, the Contractor shall have full access to this site as required to construct the TRS and T-wall for Monolith No. 3-4E and as approved by the Contracting

Officer. Access shall be coordinated with the Contracting Officer. Construction of monolith Nos. 3-5E and 3-6E shall be the last order of work at I-55 site.”

SECTION 03 11 14.00 12

Page 5, paragraph 2.1.1.1.1. Delete this paragraph in its entirety and substitute the following therefore:

“2.1.1.1.1 Class "AHV" Finish

This class of finish shall apply at the formed suction intake (FSI) as shown on the drawings. The materials for forms are the same as Class A finish except that steel forms may be used. The forms should be strong and held rigidly and accurately to the specified alignment.”

SECTION 03 42 13.00 10

Page 8, paragraph 1.6.1. Delete this paragraph in its entirety and substitute the following therefore:

“1.6.1 Delivery

Deliver precast units to the site in accordance with the delivery schedule to avoid excessive build-up of units in storage at the site. Upon delivery to the jobsite, all precast concrete units will be inspected by the Contracting Officer's representative for quality and final acceptance.”

SECTION 08 11 13

Page 4, paragraph 2.1. Delete this paragraph in its entirety and substitute the following

“2.1 EXTRA HEAVY DUTY DOORS

SDI/DOOR A250.8, except as indicated or specified otherwise, Level 3, physical performance Level A, Model 1 with core construction as required by the manufacturer for indicated exterior doors, of size(s) and design(s) indicated. Where vertical stiffener cores are required, the space between the stiffeners shall be filled with mineral board insulation.”

SECTION 09 97 02.01 12

Page 18, paragraph 3.5, SYSTEM NO. 6-A-Z. Delete this system in its entirety and substitute the revised system as follows:

“SYSTEM NO. 6-A-Z

Items or surfaces to be coated: stoplogs, trash boom pipe piles (full length exterior of pile), navigation lighting pipe piles (full length exterior of pile), wingwall sheet piling (painted full length on both sides), wingwall pipe piles (full length exterior of pile), wingwall waler, wingwall plate sections, and carbon steel pump drive supports and plate from the bottom of the right angle gear to the top of the base/sole plates.

SURFACE

PREPARATION 1st & 2nd COAT 3rd COAT 4th COAT

White metal MIL-DTL-24441/19B Coal tar- Coal tar-blast epoxy C-200a epoxy C-200a cleaning (black) (black)”

SECTION 13 34 19

Page 30, paragraph 3.2. Add new subparagraph (4) as follows:

“(4) The Contractor shall coordinate the louver frame and opening size with the HVAC contractor and louver’s manufacturer.”

SECTION 21 13 13.00 10

1. Page 5, paragraph 1.3.1.1. Delete this paragraph in its entirety and substitute the following

“1.3.1.1 Basis for Calculations

See the drawings.”

2. Page 12. Add the following new paragraph as follows:

“2.13 SERVICE WATER STORAGE TANK AND TANK HEATER

(1) Fire Protection Service Water Storage tank shall be a minimum of 2500 Gallon Vertical Tank, Material Fiberglass Reinforced Plastic ISO DCPD resin structure.

(2) Tank shall be suitable for storage of Potable Water and shall be vertical free standing on a concrete pad as shown in the drawings. Tank shall include Hold-down taps, shall include 24 inch vented manway on the side and another vented manway fitting on top. The tank shall be translucent Natural White color to provide visible content level. Tank shall be FDA-compliant UV-stabilized polyethylene for safe storage of potable water and shall comply with US Food and Drug Administration regulation 21 CFR 177.1520 (1) 3.1 and

3.2 for storage of potable water.

(3) Tank shall have straight ladder to the top of the tank. Tank shall include two 3 inch FF, vortex breaker, 4 inch coupling overflow, two galvanized anchors. Tank shall be coated with UV gel coat.

Tank type: Vertical.

Tank Capacity: 2500 Gallons.

Tank diameter: 96 inches.

Tank Height: 92 inches.

Both Manway diameter: 24 inches.

(4) Provide immersion type electric tank heater for the service water tank. Heater shall be 7.5 kW, power supply of 480/3/60 and shall have three heating elements. Heater shall be mounted on tank using 2 inch NPT brass screw plug. NEMA 4 enclosure shall be provided for the heater. Resistance coil shall be 316/316L stainless steel. Provide double pole thermostat and install thermostat inside NEMA 4 enclosure.”

SECTION 21 30 00

Page 15. Add the following new paragraph as follows:

“2.4.8 Flexible Pipe Connections

Flexible pipe connections shall be used on all piping connected to the pumps to reduce transmission of noise and vibrations and to eliminate stresses in piping systems due to misalignment and thermal movement. Flex connectors shall be molded EPDM reinforced with nylon tire cord and shall have steel floating flanges or female union ends.”

SECTION 23 00 00

Page 7. Add the following new paragraphs as follows:

“2.7 HEAVY DUTY BACKDRAFT DAMPER

Backdraft damper shall be 8-inch deep and shall consist of a 12-gauge frame constructed from 316 stainless steel. Blades shall be V-type design, fabricated from 16-gauge 316 stainless steel, and equipped with TPE (thermoplastic elastomer) blade seals for tight closure and minimal air leakage. Frame and blades shall both be constructed entirely of 316 stainless steels for maximum corrosion resistance. Damper shall be gravity-operated to allow airflow in one direction and prevent backdraft. Unit shall be suitable for heavy-duty applications in industrial or corrosive environments”

2.8. PRESSURE RELIEF DAMPER

Pressure relief damper shall be 8-inch deep and shall consist of a 10-gauge flanged channel frame constructed from 316 stainless steel with a mill finish. Blades shall be airfoil design, fabricated from 316 stainless steel, and equipped with silicon blade seals. Damper shall include a 304 stainless steel linkage. Frame and blades shall both be constructed of 316 stainless steel to ensure high corrosion resistance. Damper shall open automatically based on system pressure and close when pressure subsides, with no external power required. Unit shall be suitable for use in systems requiring controlled pressure relief and minimal leakage under backflow conditions.”

SECTION 23 31 13.00 40

Page 8, paragraph 2.3.2. Delete this paragraph in its entirety and substitute the following therefore:

2.3.2 Hangars and Supports

Anchorage and bracing for all suspended ductwork and other distribution systems needs to be provided in accordance with 2021 IBC Section 1613/ ASCE 7-10, Chapter 13.

Ductwork shall be firmly anchored or connected to supporting members. Provide necessary hangers, supports, concrete inserts, and anchors for material and equipment to be installed. No perforated strap hangers nor wire supports will be accepted. Construct the anchors and inserts of 304 stainless steel. Locate hangers and supports not greater than 10 feet from each expansion loop or joint. Provide hangers and supports for ductwork and equipment in accordance with SMACNA standards.

SECTION 31 05 19.26 12

Page 6, subparagraph 3.4(2). Delete this subparagraph in its entirety and substitute the following

“(2) Tracked construction equipment shall not be operated directly on the grid composite. A minimum fill thickness of 6 inches is required prior to operation of tracked vehicles over the grid composite. Turning of tracked vehicles should be kept to a minimum to prevent tracks from displacing the fill and damaging the grid composite.

Rubber-tired equipment may pass over the grid composite at slow speeds, less than 10 mph. Sudden braking and sharp turning shall be avoided. A minimum fill thickness of 6 inches is required prior to operation of rubber-tired equipment over polyester geogrid reinforcement.”

SECTION 31 23 00.00 12

Page 7. Add the following new paragraph as follows:

“3.3.4 Drainage

Provide for the collection and disposal of surface and subsurface water encountered during construction. Completely drain construction site during periods of construction to keep soil materials sufficiently dry. Construct storm drainage features (ponds/basins) at the earliest stages of site development, and throughout construction, grade the construction area to provide positive surface water runoff away from the construction activity and provide temporary ditches, swales, and other drainage features and equipment as required to maintain dry soils.

When unsuitable working platforms for equipment operation and unsuitable soil support for subsequent construction features develop, remove unsuitable material and provide new soil material as specified herein. It is the responsibility of the Contractor to assess the soil and ground water conditions presented by these plans and specifications; and to employ necessary measures to permit construction to proceed.”

SECTION 31 23 19.00 12

Page 3, subparagraph 1.6.d. Delete this subparagraph in its entirety and substitute the following therefore:

d. The system may consist of pumps, standby pumps, sumps, ditches, parallel sheeting and necessary appurtenances capable, at all stages less than or equal to the design stage defined in subparagraph a; of providing control of surface water. The system shall be operated as specified in the above subparagraph b to prevent flooding filter materials and fresh concrete; and shall be designed to control a rainfall intensity of 2 inches per hour. Protection of all slopes will be required to prevent erosion under normal surface runoff and construction conditions. Slope protection may include proper drainage, mulching, vegetation, geosynthetics, etc.

SECTION 31 24 00.00 12

Page 6, paragraph 1.4.1. Delete this paragraph in its entirety and substitute the following therefore:

“1.4.1 Embankment

Payment for all compacted fill material placed as required in embankments, ramps, fill and backfill, and including additional material placed by reason of foundation settlement during construction, will be made at the applicable contract unit price per cubic yard for "Embankment - RRC", "Preload Embankment - RRC", "Embankment - I-55", or "Preload Embankment - I-55". Price and payment shall constitute full compensation for all plant, labor, equipment and material, and performing all operations necessary for embankments and ramps; including excavation, control testing, hauling, foundation preparation, material processing for moisture control and blending, placing and compacting the material, employ of professional engineering services, public street cleaning; and other incidental work required to complete the embankment or fill; as specified herein and as shown on the drawings. Material obtained from excavation of the drainage ditches and placed in either the levee or stockpile areas will not be paid under embankment.”

SECTION 31 26 00.00 12

Page 4, paragraph 1.5 , subitem SD-07 Certificates, submittal item “Completion and Performance”. Delete this submittal item in its entirety and substitute the following therefore:

“Completion and Performance; G

The Contractor shall submit a list of previous projects verifying a minimum experience of 5 years as proof of successful completion and performance of similar vertical wick drain and…