RFI_Responses_07102025.pdf

W912P725BA013 MOTCO Berms Construction and Maintenance Dredging

ID RFI Questions Responses 11387181 1.7 Special Instructions for Submitting your bid:

"The public bid opening is tentatively scheduled for 10:00 am PDT on 29 July 2025."

The current bid date is July 10, 2025 at 1:00pm. Please confirm bid opening and/or bid due date.

Bid due date was extended to 24 July 2025 at 01:00 pm PDT.

Bid opening changed to 24 July 2025 at 02:00 pm PDT.

See Amendment 0002.

11389153 With the timeframe for the public bid opening, preconstruction and closeout submittals, and the environmental window for dredging, the 146-day period of performance for this project doesn't appear to be feasible.

Does the government have leeway on extending the period of performance to allow more time to complete non-dredging work and to complete closeout submittals such as the After Action Report?

We are not extending the period of performance at this time.

11387317 52.211-10 Commencement, Prosecution, and Completion of Work.

When can the contractor expect award and NTP?

NTP expected around 19-Aug-2025.

11399173 Please provide the topographic survey for Detention Basin Cell 1 and Cell 2.

See MOTCO_Topo_2015_LiDAR - Standard.zip

11399177 Is there a designated hydraulic offloading site?

Please include hydrographic survey information for the proposed area.

There is no designated hydraulic offloading site. Material from Wharves 2 and 3 shall be taken for disposal at the detention basin cells 1 and 2.

11399183 Is there a designated pipeline corridor from the hydraulic offloading site to the detention basin cells 1 and 2?

Please confirm the Contractor will be allowed to place the discharge pipeline across railroad tracks and roads as needed.

There is no designated pipeline corridor from Wharves 2 and 3 to detention basin cells 1 and 2. The contractor will be allowed to place the discharge pipeline across railroad tracks and roads.

11399187 Who owns/operates the railroad tracks?

Is there a Right of Way permit required for the pipeline crossing the railroad tracks?

MOTCO owns the railroad tracks between the Wharves and the detention basins. However, there are commercial railroad tracks that run through the installation. The pipeline can cross the MOTCO owned railway tracks without a Right of Way permit.

11399193 Section 01 57 19

3.18 SOUND INTRUSION

e. Construction must be avoided during nighttime hours (10:00 p.m. to 7:00 a.m.) and on weekends; noise levels must be kept relatively uniform and impulsive noises must be avoided.

Section 01 14 00

1.3.2 Working Hours

Regular working hours are from 0600 to 1800, 7 days a week.

Q: Please confirm the working hours are from 0600 to 1800, 7 days a week?

Q: Do the designated working hours apply to land-based operations only, or to all operations?

All operations must comply with regular working hours, unless prior permission is grant by the installation manager and director of DPW.

11399198 Section 01 35 26

1.7 Special Qualifications

40-hour HAZWOPER training per OSHA 1910.120(e)(3) and 1926.65(e)(3), is necessary for all workers within the MRS, even for non-intrusive activities such as surveying activities (e.g. quality, biological, archaeological monitors) and general workers per OSHA letter of interpretation 996-03-26-2.

Q: Please confirm that every person working onsite must have 40-hour HAZWOPER training, and that this includes all field management staff.

This breaks down to 3 categories - 1. General site workers, (workers that have repeated daily MEC exposure within the MRS that come into contact with soil, soil handling, or participate in intrusive activities to include surveyors (geo, environmental, land survey)) must receive a minimum of 40 hours of instruction, off-site, and a minimum of three days actual field experience under the direct supervision of a trained experienced supervisor prior to being assigned to perform their duties. - 2. Other site workers (workers within the MRS, but not directly exposed to soil or soil handling equipment (potentially site manager, archeologist, biologist) must receive a minimum of 24 hours of instruction, off-site, and a minimum of one day of actual field experience under the direct supervision of a trained, experienced supervisor. -3. Visitors, or anyone who is not assigned to work at the site, either permanently or temporarily, that comes to the work site for short-term observation are required to have: a. Safety brief from a person knowledgeable of the hazards expected on site and the SOH controls required. b. Escorted by appropriate site personnel.

11399200 Section 01 35 26

1.7 TRAINING REQUIREMENTS FOR HAZARDOUS WASTE OPERATIONS AND

EMERGENCY

RESPONSE SITES

Follow training requirements listed in EM 385-1-1 for Environmental Cleanup and Investigation Project sites and activities specified in 29 CFR

1910.120 or 29 CFR 1926.65 and involve operations where hazardous substances are investigated, removed, contained, incinerated, treated, neutralized, cleaned-up, or in any other manner processed or handled with the goal of making the site safer for people or the environment.

1.7.1 Initial Training Requirements

General site workers must receive a minimum of 40 hours of instruction off the project site and a minimum of three days actual field experience under the direct supervision of a trained experienced supervisor prior to being assigned to perform their duties.

Other site workers must receive a minimum of 24 hours of instruction off the project site, and a minimum of one day of actual field experience under the direct supervision of a trained, experienced supervisor.

Q: Are field management staff, or workers conducting non-intrusive activities such as surveying activities (e.g. quality, biological, archaeological monitors) considered "other site workers."

see Answer to RFI 11399198

11399201 Section 35 20 23

1.3 MATERIAL TO BE REMOVED

Q: Please confirm the material to be removed is considered maintenance material?

Q: Please confirm the dredge areas have been previously dredged to -35'?

Q: When was the last time the current dredge footprints were dredged and did the contractor encounter any MEC/UXO?

The material to be removed is considered new work material but the footprint has been dredged previously to -32 feet at Wharves 2 and 3.

Dredging last occurred in 2008 when a MEC item was found utilizing a cutter head dredge. The divers during the 2024 Large Object Debris Relocation project marked the locations of 5 larger MEC items that remain in the Wharf 2 footprint which do not require removal.

11399421 1. PDF Page 27, 52.211-12 Liquidated Damages-Construction – We respectfully request that the liquidated damages of $2,790/day be removed from the contract.

a. This clause may pose challenges because many potential causes for project delay are outside of the contractor's control, including weather, delays in obtaining permit approvals, shipping lane traffic in Suisun Bay, and availability of materials such as the berm liner. We believe a collaborative approach to managing timelines would be beneficial for both parties, allowing us to address potential delays proactively and adapt to unforeseen circumstances.

b. If the liquidated damages clause is left in the contract, it might discourage some qualified contractors from participating, potentially narrowing the field of competitive proposals.

The Government will not be removing this clause

11399422 PDF Page 27, 52.211-12 Liquidated Damages-Construction - How was the specific amount for liquidated damages calculated?

The liquidated damages were calculated based on the USACE construction management labor costs per day.

11399423 Are CLINs 0002 and 0003 to be paid on a firm fixed price basis (i.e., lump sum per CLIN), or a fixed unit rate basis (i.e., payment by cubic yard)?

CLINs 0002 and 0003 are paid on a Firm Fixed Price CY basis. FAR 52.211-18 Variation in Estimated Quantity and 52.236-16 Quantity Surveys apply to the estimated quantity CLINs.

11399424 If CLINs 0002 and 0003 are to be paid on a fixed unit rate basis (payment by cubic yard) how will the volume be measured?

Volume computations will be generated by using the TIN (Triangulated Irregular Network) computation method, as outlined in the Hydrographic Surveying Manual EM 1110-2-1003, dated November 2013, and the subsequent changes/revisions issued by HQUSACE. A 5-foot by 5-foot matrix using the average depth of all depths recorded in a cell will be generated from the edited multi-beam data to perform the TIN volume computations, following the procedures in EM 1110-2-1003.

11399425 The pricing schedule gives dredge quantities to the design depth of -35' MLLW plus 1' of over depth. Will the government please break out the dredge volumes separately for a.) volume to design depth, and b.) volume to 1' over depth?

The government will not break up the dredge volumes separately for a) volume to design depth and b) volume to 1 ft over depth in the pricing schedule.

11399426 While the dredging is being conducted, if the actual volume is projected to be above the volumes specified in the bid schedule, what is the government's expectation for response? Will the government issue change orders to the contract prior to the overage volume being dredged, or should the contractor assume demobilization after the government-specified volumes have been removed?

If the actual volumes vary less than 15% of the bid volumes, then the volume increase will be handled in accordance with FAR clause 51.211-18 "Variation in Estimated Quantity". If the actual volumes vary more than 15% of the bid volumes, then the volume increase will be handled in accordance with FAR clause 52.243-4 "Changes"

11399427 Have there been any additional sediment sampling efforts performed since the 2019 event by DR Reed and Associates that is mentioned in the Water Board permit? If so, please provide them.

The latest sediment sampling and testing was performed in 2019 by DR Reed and Associates. There has been no additional sediment sampling and testing performed since 2019.

11399428 Section 01 57 19 paragraph 3.6.11 states that during construction of the detention basins, "If pickleweed is cut, care will be taken to not disturb the root base of the plant as much as feasible to allow it to re-establish once construction is completed." Please confirm that this is correct. For other projects at MOTCO, the Contractor would be required to move any pickleweed that would be impacted by ground disturbing activities.

The statement in Section 01 57 19 3.6.11 is correct.

There is not a requirement to relocate Pickleweed for this project.

11399429 Section 01 57 19, subsection 1.10.2.3 states "Ensure the Traffic Control Plan includes recreational traffic such as bicycles and pedestrians." Figure G-003 shows that the haul route is only on MOTCO, which will have no recreational traffic or pedestrians. Is the Traffic Control Plan required to include off-base areas?

A traffic control plan is required but it does not need to include recreational traffic that includes bicycles and pedestrians.

Amendment 0002 deleted "Ensure the Traffic Control Plan includes recreational traffic such as bicycles and pedestrians." from Section 01 57 19, subsection 1.10.2.3

11399430 Has USACE already obtained any necessary permits, conditions, and approvals for the dredging effort beyond the Regional Water Board permit included in the package (BCDC, CDFW, etc.), or will this task be part of the contractor's responsibility?

The permissions USACE will be providing are the Water Board 401 Certification, the BCDC Consistency Concurrence and USFWS and NMFS Biological Opinions. These will be obtained prior to award.

11399431 For effluent water from this project that may be discharged to the local wastewater system in accordance with the Delta Diablo Special Discharge Permit, will permit modifications be required? If so, what are the modification requirements?

The contractor shall apply and obtain a special discharge permit from the Delta Diablo Sanitation District in order to discharge the effluent water to the local wastewater system. The special discharge permit application form is attached at the end of the specifications package. This is not a modification to a permit.

11399432 What is the maximum amount of water allowed to be discharged per day from this project to the local wastewater system?

Water can be discharged at a rate of 72,000/day or 50 gallons/minute. If additional daily capacity is required, the contractor may contact Delta Diablo.

11399433 For MEC clearance at the detention basin and borrow area, what is the failure criterion (i.e., what is the smallest object that must be detected and removed)?

The smallest munition of concern is 20mm Projectile, Mark I High Energy Incendiary

11399434 For the wastewater permit, the specification package is contradictory, as follows:

a. Section 01 57 19, subsection 1.10.11.c states, "If discharge into the MOTCO sewer system is necessary the Contractor must complete and submit the attached Delta Diablo SPECIAL DISCHARGE PERMIT (SDP) APPLICATION BAY POINT and play the applicable fee."

b. Attachments to Section 01 57 19.01 43 (i.e., the 401 permit) state, "If the tested decant water meets the conditions of the Permittee's existing Industrial Wastewater Discharge Permit from Delta Diablo Sanitation District, the decant water will be discharged into the sanitary sewer."

If there is an "existing Industrial Wastewater Discharge Permit," why does the contractor need to prepare a special discharge permit?

If there is an "existing Industrial Wastewater Discharge Permit", please provide a copy of the permit.

There is an existing Industrial Wastewater Discharge permit held by Delta Diablo District (DDSD_MOTCO_Wastewater_Permit_018117-S_Sept2023- April2027.pdf). In order to utilize this permit, the contractor must apply for a special discharge permit from Delta Diablo District.

11399435 PDF page 535, Section A, Project Description, states, "As the slurry is being pumped into the Management Site, it will be screened further to 20 mm for UXO and munitions." We believe this text should read, "As the slurry is being pumped into the Management Site, it will be screened to 3 inches for UXO and munitions." Please confirm.

Correct. The specifications have been modified to state 3 inches. See Amendment 0002

11401679 San Francisco Bay Regional Water Quality Control Board

401 Water Quality Certification and Order

C. Sediment Characterization

We reviewed the following report characterizing the suitability of 78,301 cy of sediments for aquatic disposal and beneficial reuse: Military Ocean Terminal Concord (MOTCO) 2019 Maintenance Dredging Final Sampling and Analysis Report, dated March 2020. Based on the report, we find that the dredged sediment is suitable for upland placement at the Management Site and the Placement Site.

Please provide the final sampling and analysis report. Please provide any additional geotechnical information that is available for the dredge areas.

See attached document for MOTCO_2019_Maintenance_Dredging_SAR- ABATED 1.pdf

11405221 3.2.4 Ranges, Gages, and Lines

Please remove the requirement to furnish, set, and maintain ranges and gages as this is antiquated and unnecessary with current survey positioning systems.

Amendment 0002 has removed this requirement.

11405225 1.5.1.3 Required Dredge Prism

3.2.9 Safety of Structures

Q: There are no dredging cross sections provided in the plans. Please provide Typical Dredging Sections as noted in spec section 35 20 23, subpart 1.5.1.3.

Q: Please provide and include a minimum of a 5' offset from the wharf face to the toe of the dredge prism to ensure the safety and stability of the wharf structure according to section 35 20 23, subpart 3.2.9.

See Amendment 0002. Note, the buffer distance between the wharf and the dredging area will be kept a 1ft.

11405227 1.10.11 Waste Water Management Plan

The specification section mentions a settling or retention pond, including a requirement to coordinate the retention pond site with the Contracting Officer for approval.

Q: Is the retention pond separate from the detention cells? Please clarify the intent of the retention pond as it relates to water produced from the hydraulic discharge of dredge sediments into the detention basin.

The retention pond and the detention cells are part of the same system. The retention pond is to hold water released from dredge sediment before it is conveyed to the POTW for disposal.

11405230 3.1.1 Extent of Work

Q: Is the dredge material within the detention cells to be hydroseeded?

Q: Does the borrow site where the contractor sources berm construction material need to be hydroseeded?

Hydroseeding is not required for dredged material within the detention cell.

No hydroseeding is required for the borrow site.

11405234 Section 31 00 00

3.1 Ground Surface Preparation

Q: The clearing and grubbing of the detention cells and the borrow site will produce a significant amount of vegetative debris. Is there an onsite dump location for this material, or where should it be disposed?

MOTCO will provide a location for the debris to be placed.

11405237 Section 31 00 00 Sheet C-105

Q: Few details have been provided regarding the borrow site and Contractors were not allowed access during the site walk. Can the Government provide a current topo survey of the borrow site, current photos of the borrow site, limits on the cut of the borrow site, and samples of the borrow site material?

Q: Are there any load restrictions along the haul route from the borrow site to the detention cells.

See documents for MOTCO_Topo_2015_LIDAR-Standard.pdf, MOTOC Dredging Wharf 2-3 Sit Visit Photo.pdf, and MOTCO_Design_Analysis-BP2- 100-Geotechn_Report_Only.pdf

11405248 Section 01 50 00

Q: During the site walk it was mentioned there was no water source available onsite. Can the Government provide the location for an available water source nearby? There is a significant need to source and store water for various tasks associated with this project.

Q: Can the Contractor source water directly from Suisun Bay?

Hydrants close to the detention basin cells can be used to provide water.

The contractor can't source the water from Suisun Bay.

11405267 Section 31 00 00 Sheet C-105

Q: Will the gates leading to the borrow site be open during the hauling?

Q: Should the contractor anticipate delays to hauling due to access concerns?

Q: Is the contractor required to have flagmen at the gates along the haul route?

Gates will be open. There are no anticipated delays expected during hauling. One flagmen will be needed in the gate with security guard.

11405479 Could the Government extend the bid response date by two weeks due to the complexity of the project?

See Amendments 0001 and 0002

11405654 Given the aggressive proposal schedule, will the government please provide answers to questions by 2PM Pacific on July 1? The answers are necessary for bidders to complete their FFP pricing. Thank you.

Answers were not provided by July 1, however, see Amendments 0001 and 0002 for extension to bid due date.

11405659 At the site walk, mention was made of a corridor described in the plans and specifications for transport of the dredge slurry between the Wharf 2 and 3 dredge areas and the detention basins. We are not able to locate this corridor in the plans and specifications. Will the government please provide plans and specs for these corridors?

There is no pipeline corridor specified in the plans and specifications. The pipeline alignment is up to the contractor.

11405666 There are twin railroad lines between the Wharf 2 and 3 dredging areas and the detention basins. Will the government please confirm that there will be no railroad traffic on these lines for the duration of the project? If there will be railroad traffic, for bidding purposes please identify the number of times contractors will be required to remove and then replace the slurry line to accommodate the railroad traffic.

There will be no railroad traffic on the twin railroad lines between Wharves 2 and 3 and the detention basins when the discharge pipeline crosses the railroad lines during dredging operations.

11409172 Is there an existing specific pipeline corridor/routing to the disposal detention cells?

There is no specific pipeline corridor/routing to the detention basin cells shown on the plans. The pipeline alignment from Wharves 2 and 3 to the detention basin cells is up to the contractor.

11409189 Does the Government anticipate requiring clearing detention cells for MEC both before and after clearing and grubbing?

The MEC clearing of the detention basin shall occur after clearing and grubbing.

11409195 Does the Government have a location for disposing the vegetation accumulated from the clearing and grubbing? 01 57 19, 1.10.6

MOTCO will provide a location for disposing the vegetation

11409212 Can in water work proceed 24/7? Regular working hours are from 0600 to 1800, 7 days a week. Work outside regular working hours requires Contracting Officer approval. Make application 15 calendar days prior to such work to allow arrangements to be made by the Government for inspecting the work in progress, giving the specific dates, hours, location, type of work to be performed.

11409214 Will the designated berm borrow source material area need to be cleared for MEC?

The borrow area shown in plan sheet C-105 does not need to be MEC cleared.

11409218 Are there any area in the project limits that are already cleared for MEC to low probability?

The borrow area shown in plan sheet C-105 has already been cleared for

MEC.

11409220 Is a biologist required to be hired by the contractor to map jurisdictional delineation of the detention sites? Does the biologist need to be on-site during the whole project to species? What species are anticipated to be monitored?

A biologist is required to map jurisdictional wetlands and be on site during all work operations to provide leadership and monitoring. The Ridgeway Rail, Salt March Harvest Mouse, Soft Bird's Beak, Suisun Marsh Aster, Delta Tule Pea and several other listed species need to be surveyed and monitored.

For a complete list of species, see Integrated_Natural_Resources_Mangement_Plan.pdf

11409223 If the detention sites and berms are covered with reinforced polypropylene, will erosion control BMP's and hydroseeding be required?

Are any BMP's required to close the excavation sites?

Typical best management practices as part of the contraction SWPP will be required for all aspects of the project including the excavation sites.

Additional information can be found in the project Specs under Section 32 92 19 Seeding; Part 3 Execution; 3.2.1.1 Hydroseeding

11409226 Does the Government pay for the Sanitary Sewer HCF fees? The contractor shall include the sanitary sewer fees from the Delta Diablo

Sanitation District in their bids.

11409233 Will the Government provide the hydrographic survey data before the bid is due?

See attachments for SF_MOTCO_20250402_CS_5Avg_MLLW (Wharves 2- 3).zip and SF_MOTCO_20250402_CS_15Avg_MLLW (Wharves 2-3).zip

11409240 Can the Government provide the sign-in sheet(s) for the pre-bid site visit. The sign-in sheet from the site visit on 26 June 2025 was uploaded to SAM.gov

11409275 Can existing material in the detention cells or the old quarry adjacent to the plan quarry area be used for an alternate berm material source?

There is no old quarry adjacent to the plan quarry area identified in plan sheet C-105. Existing material in the cell area can be used if suitable and cleared of MEC.

11409284 Are there details for pumping effluent water to the sanitary sewer manhole?

The contractor shall submit the special discharge permit application to the Delta Diablo Sanitation District. Then the Delta Diablo Sanitation District will issue the special discharge permit that would specify the requirements for pumping effluent water from the detention basin cells to the sanitary sewer manhole.

11409290 Will the contractor be provided with a schedule for operations (ships and land) that will pause the contractor's work? MOTCO will provide a schedule to the contractor for operations.

11409296 Explosives Safety Submission. MEC Removal Action

7.4 Exclusion Zone Control

Q: Will the Contractor be required to shut down dredging operations when ship traffic enters the water-side exclusion zone?

Q: Please include a standby line item for MEC-related shutdowns and delays during waterside operations.

Dredging or material handling operations will need to pause when personnel not essential to the MEC operation enter the Exclusion Zone both on the water or on land. No standby line item for MEC-related shutdowns and delays will be included.

11409303 Please extend the questions deadline to allow contractors to ask follow-up questions once responses to current questions have been provided.

Questions deadline will not be extended for follow-up questions.

11409308 Pricing Schedule

Q: Regarding CLIN 0006. The amount of MEC disposal is unknown and cannot be determined. Please change the measurement and payment for CLIN 0006 to be on a per event or, each basis. This will allow Contractors to approximate the level of effort required for a single disposal or detonation event that can be applied if more than one event is required.

The unit of CLIN 0006 regarding the MEC disposal will remain 1 Job.

11409312 Will Contractors be allowed to utilize the wharfs for waterside access? Contractors will be allowed to use Wharf 2 for waterside access

11409320 Section 01 14 00

1.3.3 Work Outside Regular Hours

Work outside regular working hours requires Contracting Officer approval.

Make application 15 calendar days prior to such work to allow arrangements to be made by the Government for inspecting the work in progress, giving the specific dates, hours, location, type of work to be performed.

Q: Can the Government formally allow work to be conducted 24 hours per day, 7 days per week to allow contractors more flexibility in planning the most effective operation.

Regular working hours are from 0600 to 1800, 7 days a week. Work outside regular working hours requires Contracting Officer approval. Make application 15 calendar days prior to such work to allow arrangements to be made by the Government for inspecting the work in progress, giving the specific dates, hours, location, type of work to be performed.

11409326 In the unfortunate event that Liquidated Damages clauses are not removed from the contract, how will the clause be activated, and how will the Liquidated Damages be calculated?

See FAR clause 52.211-12 "Liquidated Damages-Construction"

11409327 1.10.9 Regulatory Notification and Permits

List the Federal, State and local laws, regulations, notifications, permit applications, mitigation requirements concerning environmental protection, pollution control and abatement. Some permits require up to 180 calendar days to obtain. Obtain those permits and include copies of applicable environmental permits. The EPP will not be approved until the permits have been obtained.

Q: What Contractor responsible permits require 180 calendar days to obtain?

"Some permits require up to 180 calendar days to obtain." has been removed from the specifications. See Amendment 0002.

11409331 3.7.1 Preconstruction Air Permits

Notify the Installation Air Program Manager, through the Contracting Officer, at least 6 months prior to bringing equipment, assembled or unassembled, onto the site, so that Clean Air Act (CAA) permits can be secured. Include permitting time in project schedule. Obtain Clean Air Act (CAA) permits prior to bringing equipment, assembled or unassembled, onto the site. Pay permit application fees.

Q: The current period of performance is 146 days. Please advise how the Contractor is to meet the 6 months notification requirement noted above.

Specifications have been modified to require notification of the Installation Air Program Manager is required within 15 calendar days after execution of notice to proceed and not less than 10 calendar days before the preconstruction meeting. See Amendment 0002.

11409337 1.6 PERMIT

All work shall be performed in accordance with the conditions and requirements included in the state and federal permits applicable to this project. The list of permits is shown on spec section 01 57 19.

Q: Please provide the specific location where the list of permits can be reviewed?

The sentence "The list of permits is shown on spec section 01 57 19" has been deleted (See Amendment 0002). See Responses to Inquiries 11399430 and 11399434.

11409338 In the unfortunate event that Liquidated Damages clauses cannot be removed from the contract, how will the nature of the delay be considered in determining whether Liquidated Damages are assessed?

Will the government please confirm that it will not assess liquidated damages for delays related to:

• Weather;

• Supply chain issues outside of the contractor's control;

• Permitting or regulatory approval requirements (because the plans and specs do not assign any permitting or regulatory approval responsibilities to the contractor);

• BIPs or other required UXO or waste management activities above which can be expected from existing publicly available data;

• Suisun Bay shipping lane requirements that could impact dredging or UXO operations;

• MOTCO defense mission requirements that would precede this contract in terms of importance to national security; and

• Any other issues that are outside of the Contractor's control.

When delay in completing the work arises from unforeseeable causes beyond the control and without the fault or negligence of the Contractor, the Contractor will not be charge with damage. See FAR 52.249-10(b)(1) for example.

11409340 There is a road between Detention Basin 1 and Detention Basin 2. Will the government please confirm that there will be no road traffic here for the duration of the project? If there will be road traffic, for bidding purposes please identify the number of times contractors will be required to remove and then replace the slurry lines to accommodate the traffic.

The road between Detention Basin cells 1 and 2 will be closed during dredging operations.

11409342 Specification SECTION 31 00 00, subsection 3.5 states that a "40-mil thick reinforced polyethylene liner" will be used to line the detention basin.

Please specify what is meant by, "reinforced". Is a double or poly scrim reinforced polyethylene liner required?

A double polyethylene liner or poly scrim reinforced polyethylene liner would meet the requirements of a reinforced polyethylene liner. However other variations may be acceptable.

11409348 While an EA appears to be available for this project, that EA (https://ceqanet.lci.ca.gov/2021060547) appears to cover a different version of this project. Has a NEPA assessment been performed for the version of this project that is in the Specifications? If so, can copies of the CATEX/EIS/EA be shared to see the former and current availability and impact of the salt marsh harvest mouse (SMHM)? If not, will it be done? If it will be done, will it be performed by the government or the contractor?

If it will be performed by the government, please specify a delivery date to the contractor.

The Draft EA is available online at https://www.sddc.army.mil/Shared%20Documents/Public_Draft_%20MOTC O%20Dredging%20EA_25APR2025.pdf. The FONSI is scheduled prior to award.

11409352 During the site walk, Mr. Dan Killip pointed to an area south of Shaner Road as the staging area that contractors could use. However, Sheet G- 003 of the Plans provided by the government show the staging area as being north of Shaner Road. Would the government please clarify where the staging area is located?

The staging area is shown in plan sheet G-003.

11409360 Can an additional staging area be added in the vicinity of Transfer Pad C or Holding Pad 1 (e.g., near where bidders parked their vehicles during the site walk prior to hiking to the borrow area)?

The staging area for the MOTCO Berms Construction and Dredging Project is shown in plan sheet G-003.

11409362 The haul route shown in Sheet G-003 crosses two bridges: a) one over

Waterfront Road and b) one over the Contra Costa Canal. Please provide weight limits and axle limits for each bridge.

20 tons is the weight restrictions.

11409366 What is the maximum allowable width for vehicles crossing the two bridges shown in Sheet G-003 [i.e., a) over Waterfront Road and b) over the Contra Costa Canal?]

15 feet

11409369 Will USACE mow the Detention Basin Cell footprints prior to the MEC clearance, or will mowing be the responsibility of the contractor?

Clearing and grubbing of the Detention Basin Cell footprints prior to the MEC clearance shall be done by the contractor.

11409379 Has USACE performed an aerial or ground-based topographic survey of the Detention Basin Cells, and if so will the government please share those files with bidders?

See document for MOTCO_Topo_2015_LiDAR - Standard.zip

11409396 During the site walk, there was some equipment observed in the footprint of the Detention Basin Cells. The equipment appeared to be photographic equipment, and lightning protection. Will the government please confirm that this equipment will be removed prior to the issuance of this contract?

The government will have the equipment removed before the start of the work.

11409439 Is any geotechnical data available for the soil from the borrow area? If so, please provide it.

See MOTCO_Design_Analysis-BP2-100-Geotech_Report_Only.pdf