Attachment 2_ PPI_DDG(X) Shaftline Foundation_Responses.xlsx
XLSX spreadsheet 58 KB Posted
- Solicitation number
- N4008525R0001
About this file
This document is a Request for Information (RFI) Amendment for a Navy construction project involving DDG(X) Shaftline Foundation work at the Philadelphia Navy Yard Annex. The solicitation (N4008525R0001) is restricted to a specific MACC group and involves detailed specifications for micropile installation, foundation work, and site-specific requirements. Key project details include an anticipated award date of 30 September 2025, US citizenship requirements for site access, and specific technical requirements such as cast-iron T-slot floor systems, methane gas monitoring, and indoor air quality management. The project requires three separate personnel roles (Superintendent, Quality Control Manager, and Site Safety and Health Officer), and involves complex geotechnical work including micropile installation with specific load and testing specifications.
The RFI amendment addresses numerous technical questions from potential contractors, covering areas such as excavation, utility identification, noise restrictions, testing procedures, and environmental considerations. Critical technical specifications include requirements for micropile installation (60-ton compression capacity), pressure grouting techniques, and compliance with specific testing standards like ASTM D1143 and D3689. The project involves deep foundation work, with specific guidelines for methane gas safety, indoor air quality management, and construction noise limitations. The contracting agency is the Department of the Navy Naval Facilities Engineering Command, and bid pricing must be held for 120 days from proposal submission.
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RFI Submittal
| PPI No. | REFERENCE | QUESTION | GOVERNMENT RESPONSE | Amend No. | ||
| Page | Section | Para. |
| 1 | Reference drawing 4S001, Deep Foundations Note #1. Please provide "The recommendations of the geotechnical memorandum by WRA, dated 3/4/25." along with any other pertinent geotechnical documents. | Geotechnical recommendations are incorporated into the drawings and specifications. | 0001 | |||
| 2 | Reference drawing 4S001, Deep Foundations Note #8. This note requires the contractor to submit a Methane Gas Safety Plan which must remain in place throughout construction. Please advise if the exterior overhead door can remain open during the day while construction is in progress ? Are the upper windows in the facility operable and if yes, can they remain open during construction ? Is monitoring and action of methane only during construction working hours or is this a 24/7 requirement during the contract ? | See General Shet Note #9 on 4S101, "THE METHANE MITIGATION PLAN (MMP) AT A MINIMUM MUST INCLUDE THE CONTRACTORS APPROACH FOR MONITORING METHANE GAS DURING PILE INSTALLATION AND ACTIONS THAT WILL BE TAKEN BY THE CONTRACTOR IF METHANE IS ENCOUNTERED." Assume overhead vehicle and equipment doors must remain closed unless otherwise permitted in Setion 01 14 00. Upper windows are inoperable. | 0001 | |||
| 3 | 13 | 01 35 26 | 1.16 | An Indoor Air Quality Plan is to be submitted, approved and followed during construction. Will it be acceptable to keep the existing exterior overhead door open during working hours to aid in providing the necessary air changes ? Is it acceptable to use diesel powered equipment inside the building ? | See specification section 01 57 19 for Indoor Air Quality Plan requirements. Assume overhead vehicle and equipment doors must remain closed unless otherwise permitted in Setion 01 14 00. See revised Spec Section 01 35 26 provided as part of this Amendment. | 0001 |
| 4 | 14 | 01 35 26 | 1.16.2 | This paragraph requires a detailed building flushout after completion of construction. Is this flushout requirement necessary ? | Provide building flush-out per the specification requirements. The specification also permits indoor air contaminant testing to be performed - See updated Spec Section 01 35 26 as part of this Amendment. Note that the HVAC systems in the affected space are make-up air units (outside air only) and exhaust fans. | 0001 |
| 5 | 7 | 01 50 00 | 3.1 | This paragraph states: "The contractor must assume that off-site parking and contractor provided shuttling will be required.". Is this requirement accurate and if yes, please indicate the location for an employee parking area. | Parking area will be designated by the Contracting Officer post-award. However, assume the parking location is within the Philadelphia Navy Yard Annex on Government property. | 0001 |
| 6 | The scope of work requires the removal of slab on grade and excavation of existing soil. The contract documents do not indicate that there are any existing utilities withing the footprint of the work area. Please confirm that the contractor shall assume that for bidding purposes, there are no existing underslab utilities that would interfere with the new work. | Comply with specification section 01 11 00 paragraph 1.5 for identifying, scanning, and marking potential underground utilities. Contact the Contracting Officer if existing underground utilities are found within the project area. See updated drawing 4SD101 and 4S101 provided as part of this Amendment. | 0001 | |||
| 7 | 2 | 13 50 00 | 2.1 | Drawings & Specs indicates to provide a "cast-iron" T-Slot Floor System. There are limited domestic manufacturer(s) that produce cast iron T-Slot Floor System. Please clarify the following: a) Cast Iron T-Slot Systems - We are informed that such flooring systems are imported from Germany and may/may not comply with the Buy American Act. Requesting material substitution from cast iron to A36 steel which is produced domestically. b) Is extruded aluminum acceptable in lieu of cast-iron? | The Navy and Designer of Record understand there to be multiple cast iron floor plate manufacturers in the US. Grade A36 steel nor aluminum are acceptable materials. Comply with the requirements of Section 13 50 00. | 0001 |
| 8 | 8 | 31 62 00 | 3.4 | “The Micropile Specification Section 3.4 Pile Load Tests states “Perform compression load testing in accordance ASTM D1143/D1143M, except as modified herein”. Would it be acceptable to perform the micropile verification and proof tests in tension in accordance with ATSM D3689 in lieu of the compression test as long as the test pile steel is properly designed to not be overstressed from the tension loading? Performing a tension test to confirm the compressive capacity of a micropile is a standard practice since micropiles are designed to derive their capacity in friction and their friction capacity is the same whether the force is applied in tension or compression. Compression tests require installing hold down anchors for the test frame which makes tension test more economical to perform.” | At least one verification test pile must be tested in compression per the Contract Documents. For the remainder of the verification and proof tests, tension tests per ASTM D3689 are acceptable. Contractor's engineer must verify test piles have sufficient capacity to resist tension test forces. Geotechnical consultant qualifications and requirements are provided in Section 31 62 00. | 0001 |
| 9 | 2 | 01 14 00 | 1.2.7 | This paragraph states: "Demolition work that produces noise over 85 decibels, 8 hour time-lapsed average, or significant dust must be performed off-hours (approximately 4 pm to 5 am). Is this requirement limited to only demolition work ? For instance, new micropile installation operations will most likely exceed exceed the 85 db threshold. | Specification Section 01 14 00 Paragraph 1.2.j applies to demolition work. This response does not waive any other requirements included in the specification that may apply to work restrictions associated with noise (for example, Occupational Noise Exposure requirements in 29 CFR 1910). | 0001 |
| 10 | General | Please clarify plumbing tie-ins from the trench drain sump pumps. | There are no plumbing tie-ins and there are no sump pumps. | 0001 | ||
| 11 | General | Please clarify if existing sump pumps are to remain, if new, please clarify capacity and confirm existing electrical information. | Existing sump pumps are to remain unless they are called out for demolition on the drawings. This project does not include new sump pumps or salvage and reinstall of existing sump pumps. The new trench drain and sump pits around the perimeter of the slab do not require plumbing or sump pumps. | 0001 | ||
| 12 | General | Please clarify if vibration monitoring is required. | Provide vibration monitoring. Refer specification 31 01 00 included with this amendment. | 0001 | ||
| 13 | General | For planning the preliminary project schedule, what is the anticipated award date? | Anticipated Award Date is 30 SEP 2025, however bid pricing is to be held for 120 days from the time of proposal submission in accordance with the Price Proposal Form. Project award could occur anytime within the 120 day window. | 0001 | ||
| 14 | General | Does this project have US Citizenship requirements for access to site or working on the site? | Yes. US Citizenship is required | 0001 | ||
| 15 | General | Please confirm the Superintendent can perform the duties of QCM or SSHO concurrently with the duties of Superintendent? Or are there to be three individuals to perform each duty? | Per the contract specifications, there are to be three individuals that perform each duty. | 0001 | ||
| 16 | General | Subcontractors are requesting two additional weeks for bidding. Please extend bid date. | Please see Amendment 0001 | 0001 | ||
| 17 | General | Is the there an Justification and Approval Class for the T-slot floor system or preferred flooring manufacturer? | No J&A or preferred manufacturer was identified as it is the Navy's understanding that multiple manufacturers can provide the system identified in the drawings and specs. | 0001 | ||
| 18 | 31 62 00 | 2.1.1.6.d | There is discrepancy in loading requirements for the micropiles. Micropile specification (31 62 00) section 2.1.1.6 d. states “Threaded joints shall develop and ultimate load transfer of 175 kips in compression and 80 kips in tension”. On plan 4S001, in the Deep Foundations section, item 3 states “Provide micropiles with a 60-ton allowable compression capacity” and item 4 states “Micropiles with the capacities indicated above have a lateral capacity of 2.7 tons with ½” top of pile deflection.” Please confirm the allowable capacities required. | There is not a discrepancy. Paragraph 1.2.1 states "The allowable design load for the 9.625 inch diameter micropiles is 60 tons compression". This is consistent with the capacity listed on the drawings. Paragraph 2.1.1.6.d is specific to the pipe casing and the capacities of the threaded joints. | 0001 | |
| 19 | 7 | 31 62 00 | 3.1.2 | The Micropile Specification Section 3.1.2 Grouting states, “The contractor shall pressure grout the micropile as the casing pipe is extracted to develop the specified bond length shown on the drawings”. Would it be acceptable for the micropiles to be tremie grouted without pressure grouting if the micropile design utilizes a lower bond stress and longer bond length? The bond stress achieved through tremie grouting would be confirmed by the verification tests. | No. | 0001 |
| 20 | Drwg 4E101 | Please confirm that it is not a requirement to provide grounding to the new slab reinforcing bar. | It is not required to tie in the slab to the grounding grid that is being established. | 0001 | ||
| 21 | 31 62 00 | 3.1.2 | Does the Government have specific requirementsfor the micropile pressure grouting or will the requirements for pressure, volume, and/or time be the sole discretion of the micropile engineer ? | Requirements for grouting are indicated in paragraph 3.1.2. The Contractor must submit micropile installation procedures and drilling procedures for review and approval by the Government as indicated in paragraph 1.3. | 0001 | |
| 22 | 31 62 00 | 3.1.2 | Will it be acceptable to the Government for the bond zone to be pressure grouted only after the last piece of casing exposing the full bond zone length has been removed, if that is how the piles are designed by the micropile engineer ? Or will the Government require the pressure grouting to be performed after the removal of each piece of casing ? | Pressure grouting must be performed after the removal of each piece of casing as indicated in paragraph 3.1.2. | 0001 | |
| 575/640 | 31 62 00A | Drawing 2079546 was provided and shows locations of borings. Although boring information is provided for borings B-1 and B-2, it is requested that the boring information be provided for borings B-4 and B-5. | Response Pending | |||
| 31 62 00 | 3.1 | It is our understanding that other micropiles have been installed on another project that is currently under construction at the building and they were redesigned to Stelcor DDM piles. Given their performance, would the use of this type of pile be an acceptable equal to the Government for bidding purposes? | Response Pending | |||
| Drwg 4E101 | KeyNote 5 | KeyNote 5 requires that the DLO type ground strap cable to be connected to a new ground rod. We are unable to find an exothermic weld or irreversible mechanical connector to make this connection. Please provide an approved product for this connection. | Response Pending | |||
| 31 62 00 | 1.3 | Please advise if the Government has established acceptable levels of methane gas in order for work to proceed ? | Response Pending | |||
| 31 62 00 | 1.3 | Will the contractor/micropile subcontractor be compensated for any downtime associated with encountering methane gas during micropile installation and for the time required to reach an acceptable level ? | Response Pending |
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