Design Revision 02.pdf

PWD Norfolk, Facilities Engineering and Acquisition Division Form Version 2023.11.07 Page 1 of 2

Design Revision 02 eProjects Work Order Number: 1772159

Construction Contract Number: N40085-21-D-0007

Building: Pier 11

Project Title: Pier 11 Partial Demolition

Date: 15 November 2024

Design Revision Purpose

1. Revised Responses to PPIs #10R, 13R, 50R, 78, and 79

Drawing Revisions

On NAVFAC Drawing No. 12,909,881 (G-02)

GENERAL NOTES: Note 22, Delete the following sentence, “Retain a Geotechnical Engineer Licensed in the Commonwealth of Virginia to design a Pile Extraction Plan” and replace with the following, “All Fenders Piles are to be extracted. All concrete piles are to be cutoff at -55 feet Mean Lower Low Water (MLLW) datum.”

Specification Revisions

The following specifications are revised as of 11/15/2024.

DIVISION 01 – GENERAL REQUIREMENTS

01 57 19 – TEMPORARY ENVIIRONMENTAL CONTROLS

1.6 QUALITY ASSURANCE

Paragraph 1.6.6 Protected Species Observation Qualifications.

Delete this paragraph in its entirety and replace with the following, “1.6.6 Marine Mammal Protection Plan.”

See attached Marine Mammal Protection Plan that accompanies this Design Revision.

DIVISION 02 – EXISTING CONDITIONS

02 41 00 – DEMOLITION

Add the following paragraph as “1.11 POST DEMOLITION DEBRIS SURVEY” as follows:

PWD Norfolk, Facilities Engineering and Acquisition Division Form Version 2023.11.07 Page 2 of 2

1.11 POST DEMOLITION DEBRIS SURVEY

Conduct an underwater debris survey following the completion of in-water construction and demolition activities. The minimum required survey area must include both side scan and multi-beam sonar surveys of the demolished structure area (the perimeter of the outer extents of the turbidity curtain as shown on Sheet G-03).

The Contractor shall hire a government approved independent third party hydrographic surveying company to perform all surveys. All survey work shall be performed in accordance with the current version the US Army Corps Hydrographic Surveying Manual EM 1110-2-1003 and shall be performed under the direction of a State Licensed Professional Surveyor or Civil Engineer.

Multibeam sonar equipment shall operate at a minimum frequency of 400 kHz. Sidescan Sonar equipment shall operate at a minimum frequency of 800 kHz.

The survey will be used to identify debris/potential obstructions. If debris/potential obstructions are identified, remove materials as directed by the Government. Broken piling shall be cut-off as indicated in the contract drawings. All Contractor generated debris shall be removed.

Plot the scaled survey results and identify/number potential debris targets on the plot. Visually inspect and identify potential debris/potential obstruction targets using divers. Prepare a written report of the survey that includes the plotted survey results and descriptions of the potential debris/potential obstruction targets.

All raw, unprocessed, multibeam sonar survey field data files along with all ancillary files required for processing shall be submitted to the government for independent verification as deemed necessary by the government.

Paragraph 3.1.1 Structures

Delete the following sentence from part a., “Remove exterior concrete pile, interior concrete battered piles, finder piles by extraction as indicated in drawings.”

Paragraph 3.1.4 Concrete Piles

Delete the entire paragraph and replace with the following, “All concrete piles are to be cutoff as indicated in the drawings. Use care to minimize the amount of sediment and debris generated during these operations.”

DIVISION 35 – WATERWAY AND MARINE CONSTRUCTION

35 59 13.14 20 – POLYMERIC PILES

3.4 INSTALLATION

Paragraph 3.4.2.1 Jetting of Piles.

Delete sentence and replace with, “Jetting of piles is permitted.”

MARINE MAMMAL PROTECTION PLAN (MMPP)

Chapter 1. Mitigation Measures The following mitigation measures shall be implemented during in‐water noise generating activities to minimize Level A and Level B harassment.

i. Coordination: The Navy will conduct briefings between construction supervisors and crews, the marine mammal monitoring team, and Navy staff prior to the start of all pile driving activity and when new personnel join the work, to explain responsibilities, communication procedures, marine mammal monitoring protocol, and operational procedures.

ii. Soft Start: The contractor shall utilize a “soft start” procedure to provide a warning and/or give animals in proximity to pile driving the opportunity to leave the area prior to an impact driver operating at full capacity. The soft start shall be accomplished by providing an initial set of strikes from the impact hammer at reduced energy, followed by a 30‐second waiting period, then two subsequent sets. The soft start procedure shall be used for impact pile driving at the beginning of each day’s in‐water pile driving or any time pile driving has ceased for more than 30 minutes.

iii. The reduced energy of an individual hammer cannot be quantified because they vary by individual drivers. Also, the number of strikes will vary at reduced energy because raising the hammer at less than full power and then releasing it results in the hammer “bouncing” as it strikes the pile resulting in multiple “strikes.”

iv. Visual Monitoring and Shutdown Procedures: The Contractor shall submit a Marine Mammal and Hydroacoustic Monitoring Plan to NAVSTA Norfolk environmental office for approval prior to commencement of in water project activities. At a minimum, the plans must include the following:

The monitoring shall be implemented and shutdown procedures shall be put into effect if a marine mammal were to approach the shutdown zone for the activity being conducted.

Impacts are expected to be insignificant and no injury would be expected, as monitors must ensure the shutdown zone is clear of mammals before the start of in‐water noise generating activities.

v. For humpback whales, work will stop any time the species is sighted approaching the humpback whale Level A harassment zone. This approach will prevent the need for Level A takes for this species.

vi. For all impact and vibratory pile driving and drilling, shutdown zones would be as specified in Table‐1. These shutdown zones will help to reduce injury. They will be monitored at all times as specified in Table‐1 and work will stop as soon as safely possible if an animal is seen approaching this zones.

vii. In order to prevent injury from physical interaction with construction equipment, a general construction shutdown zone of 10 m or 33 ft. shall be implemented during all in‐water construction activities having the potential to affect marine mammals to ensure marine mammals are not present within this zone. These activities could include but are not limited to

1) barge positioning, 2) dredging, or 3) pile driving. For some sound‐ generating activities, the potential for Level A (PTS onset) harassment by acoustic injury extends less than 10 m from the source, and for these activities, the shutdown zone automatically mitigates/minimizes Level A (PTS onset) harassment.

viii. Visual monitoring shall be conducted by experienced personnel with training in marine mammal detection and the ability to describe relevant behaviors that may occur in proximity to in‐water construction activities (hereafter “Protected Species Observers” [PSOs]).

ix. Pile driving will cease if any marine mammal is detected in or approaching the Level A shutdown zones as described in Enclosure‐1. Activity will resume only after the PSO has determined that, through sighting or by waiting approximately 15 minutes, the animal has moved outside the shutdown zone.

x. All species that enter either the Level A (PTS onset) harassment or Level B (behavioral) harassment zones shall be monitored and documented, with the PSO estimating the amount of time the animal spends within the Level A or Level B zone while pile driving is underway.

xi. In the event of a shutdown, pile driving shall be halted and delayed until either the animal has voluntarily left and been visually confirmed beyond the shutdown zone or 15 minutes have elapsed without re‐detection of the animal.

xii. Visual monitoring must take place from 30 minutes prior to initiation through 30 minutes post‐ completion of pile driving. Prior to the start of pile driving, the shutdown zone and disturbance zone shall be monitored for 30 minutes to ensure that the zones are clear of marine mammals.

Pile driving will only commence once observers have declared the shutdown zone clear of marine mammal.

xiii. Monitoring shall be conducted by, at a minimum, a two‐person PSO team. Given the configuration of the ZOIs, which vary depending on the pile type/size and the pile driver type it is assumed that two PSOs would be sufficient to monitor the ZOIs for impact drivers, and three to four PSOs would be sufficient to monitor the ZOIs for vibratory drivers. However, additional monitors may be added if warranted by the level of marine mammal activity in the area. PSOs shall be placed at the best vantage point(s) practicable to monitor for marine mammals and implement shutdown/delay procedures when applicable by calling for the shutdown by the pile driver operator.

Table‐1 Proposed Shutdown Zone Distances by Activity

Source: NAVSTA Planning Staff Notes: Proxy sources used were unattenuated

Pile Type Pile Size and Count Per Day

Total Pile Driving Days

Injury (PTS Onset) Level A Behavior

Disturbance Level B

Low‐Frequency Cetaceans

Distance to 183 dB SELcum Threshold

Mid‐Frequency Cetaceans Distance to 185 dB SELcum

Threshold

High‐Frequency Cetaceans Distance to

155 dB SELcum Threshold

Phocids Distance to 185 dB SELcum Threshold

Distance to 160 dB RMS Threshold

Concrete 36‐inch, square pre‐cast 5 days 101 m 65.8 m N/A N/A N/A

Concrete 24‐inch, square pre‐cast 9 days 81 m 45.7 m N/A N/A N/A

Composite Fender

13‐inch, 6 per day 2 days 401.7 m 141.3 m 478 m 215 m 9 m

Chapter 2. Monitoring Zones

i. Level A and Level B Harassment Monitoring Shutdown Zones

Level A and Level B harassment monitoring zones are shown in Enclosure‐1. These harassment zones may be truncated as they take into account the natural and manmade barriers to sound transmission along the shoreline.

ii. Observer Monitoring Locations

To effectively monitor the Level A and Level B harassment zones, PSOs shall be positioned at the best practicable vantage points, taking into consideration security, safety, and space limitations. The actual number of PSOs may vary depending on the construction activity and the size of the Level A and Level B harassment zones for the activity.

Chapter 3. Visual Monitoring Protocols

The visual monitoring components of this Plan take into consideration the logistical, environmental, and security requirements for working in the project area. The distances to the Level A and Level B harassment boundaries are used to determine monitoring locations for the activities associated with this Plan.

I. Protected Species Observer Qualifications:

The PSOs must meet NMFS qualifications for PSOs: either be biologists with prior training and experience to meet the qualifications in conducting marine mammal monitoring, professional PSOs with certification (i.e., Protected Species Observer), recognized membership in a professional organization (i.e., Marine Mammal Observer Association), or may substitute education (undergraduate degree in biological science or related field) or training for experience. The PSO (or lead PSO if multiple PSOs required) must have had prior experience working as a PSO on construction projects.

All PSOs shall be independent observers (i.e., not construction personnel or personnel directly employed by the contractor) who have the ability to correctly identify the marine mammal species and accurately describe the relevant species‐specific behaviors that may occur in proximity to in‐ water construction activities.

Additional qualifications and protocols of PSOs include the following:

a. Must have the ability to conduct field observations and collect data according to the assigned protocol.

b. Where a team of multiple PSOs are required, one observer shall be designated as lead observer throughout the duration of the project. The lead PSO must have had prior experience working as an observer on construction projects.

c. All credentials for assigned PSOs shall be submitted to the Navy for approval

d. All PSOs working on this project must attend a training brief by the Installation Natural

Resources Manager (NRM) that will include the following:

• Navy’s Marine Species Awareness Training video shall be shown

• Harassment zones that must be monitored and locations where PSOs must be stationed

• Monitoring and data collection protocols

e. Must have experience or training in the field identification of marine mammals, including the identification of behaviors

f. Must have visual acuity in both eyes (correction is permissible) sufficient for discernment of moving targets at the water’s surface with ability to estimate target size and distance.

Use of binoculars may be necessary to correctly identify the target.

g. Must have sufficient training, orientation, or experience with the construction operation to provide for personal safety during observation periods.

h. Must have writing skills sufficient to prepare a report of observations including but not limited to the number and species of marine mammals observed, dates and times when in‐water construction activities were conducted, dates and times when in‐water construction activities were suspended to avoid potential incidental injury from construction sound of marine mammals observed within a defined zone, and marine mammal behavior.

i. Ability to communicate orally, by radio or in person, with project personnel to provide real‐time information on marine mammals observed in the area as necessary.

II. Visual Monitoring A minimum of two PSOs would be utilized for impact pile driving activities and 3‐4 PSOs would be used for vibratory driving and drilling activities. Additional PSOs may be necessary depending on the size of the Level A and Level B harassment zones for the specific activity that is occurring. PSOs will be required to be stationed on elevated platform(s).

a. Equipment The following equipment shall be required to conduct visual monitoring:

• Laser rangefinders used to measure distances to known objects as reference points for distances to marine mammals observed in the water

• Portable marine radios for the observers to communicated with the lead PSO, construction contractor and other observers

• Hearing protection for all personnel near the sound source. Depending on observer locations relative to the sound source, and the subsequent airborne source levels, a noise‐reducing headset with capabilities to connect to a radio may be used

• Cellular phones (one per PSO location), and the contact information for the lead observer, other observers, and construction contractor

• Nautical charts

• Daily tide table for the project area

• Watch or chronometer

• Standard handheld binoculars and, if needed, high magnification binoculars

• Monitoring plan, Level A and B harassment zone figures, and/or other relevant permit requirement specifications in sealed transparent plastic cover

• Data collection sheets with plastic cover (waterproof paper recommended)

• Marine mammal identification guides (waterproof paper recommended)

• Clipboard

• Pen/Pencil (capable of writing in rain)

• Elevated platform(s)

III. Visual Monitoring Methods

Prior to the start of all in‐water noise generating activities, briefings shall be conducted between the Navy, the construction contractor, and the PSO team. Briefings shall be conducted any time new personnel join the work. These briefings will explain responsibilities, communication procedures, visual monitoring protocols, and operational procedures. All PSOs must attend the training brief described above in Section I.

The PSOs are tasked with collecting marine mammal sighting data, including behaviors noted for pre‐, during‐, and post‐pile driving periods. All observations of marine mammals shall be logged, with locations within the Level A or Level B harassment zone or shutdown zone noted. An assessment of take must occur if an animal or group of animals enters any of the Level A or Level B harassment zones during project‐related activities. The efficacy of visual detection depends on factors such as the PSOs ability to detect the animal, the environmental conditions (visibility and sea state), and monitoring platforms. Pre‐, during‐, and post‐ noise generating activity visual survey protocols are described below.

a. Visual Survey Protocols

The following survey protocols shall be implemented prior to the start of noise generating activities:

Pre‐Activity Monitoring: The Level A (PTS onset), shutdown and Level B (behavioral) disturbance zones will be monitored for 30 minutes prior to in‐water construction/demolition activities. If a marine mammal is present within the shutdown zone, the activity will be delayed until the animal(s) leave the shutdown zone. Activity will resume only after the PSO has determined that, through sighting or by waiting approximately 15 minutes, the animal has moved outside the shutdown zone. If a marine mammal is observed approaching the shutdown zone, the PSO who sighted that animal will notify the shutdown PSO of its presence.

During‐Activity monitoring: If a marine mammal is observed entering the Level A (PTS onset) or Level B (behavioral) zone, that activity shall halt all pile driving.

Activity will resume only after the PSO has determined that, through sighting or by waiting approximately 15 minutes, the animal has moved outside the shutdown zone.

Post‐Activity Monitoring: Post‐Activity Monitoring: Monitoring of the Level A (PTS onset) shutdown and Level B (behavioral) harassment zones must continue for 30 minutes following the completion of the activity.

b. Data Collection

PSOs must use approved sighting forms (Appendix C). At a minimum, the following information shall be collected on the sighting forms:

Date and time that noise generating activities begin and end

Construction activities occurring during each observation period

• Weather parameters identified in the acoustic monitoring (i.e., wind, humidity, temperature)

• Tide state and water currents

• Visibility

• Species, numbers, and, if possible, sex and age class of marine mammals

• Marine mammal behavior patterns observed, including bearing and direction of travel, and, if possible, the correlation to SPLs

• Distance from pile driving activities to marine mammals and distance from the marine mammal to the observation point

• Estimated amount of time an animal spends within the Level A or Level B harassment zones while noise generating activities are underway

• Locations of all marine mammal observations

• Other human activity in the area

To the extent practicable, PSOs must record behavioral observations that may make it possible to determine whether the same or different individuals are being taken as a result of project activities over the course of a day.

III. Interagency Notification for Injured or Dead Marine Mammals

In the unanticipated event that the specified activity clearly causes the take of a marine mammal in a manner prohibited by the issued authorization, such as a serious injury, or mortality, the contractor must immediately cease the specified activities and report the incident to the NMFS Office of Protected Resources and Greater Atlantic Region Stranding Coordinator (866‐755‐6622). The report must include the following information:

a. Time and date of the incident

b. Description of the incident

c. Environmental conditions (i.e., wind speed and direction, Beaufort sea state, cloud cover, and visibility)

d. Description of all marine mammal observations and active sound source use in the 24 hours preceding the incident

e. Species identification or description of the animal(s) involved

f. Fate of the animal(s)

g. Photographs or video footage of the animal(s)

Activities must not resume until NMFS is able to review the circumstances of the prohibited take.

NMFS will work with the Navy to determine what measures are necessary to minimize the likelihood of further prohibited take and ensure MMPA compliance. The Navy may not resume their activities until notified by NMFS.

In the event the contractor discovers an injured or dead marine mammal, and the lead PSO determines that the cause of the injury or death is unknown and the death is relatively recent (i.e., in less than a moderate state of decomposition), the Navy must immediately report the incident to the Office of Protected Resources, NMFS, and the Greater Atlantic Coast Region Stranding Coordinator.

The reports must include the same information identified above. Activities may continue while NMFS reviews the circumstances of the incident. NFMS will work with the Navy to determine whether additional mitigation measures or modifications to the activities are appropriate.

In the event the contractor discovers an injured or dead marine mammal, and the lead PSO determines that the injury or death is not associated with or related to the specified activities (i.e., previously wounded animal, carcass with moderate to advanced decomposition, or scavenger damage), the Navy must report the incident to the Office of Protected Resources, and the Greater

Atlantic Coast Region Stranding Coordinator within 24 hours of the discovery.

All incidences of injured or dead marine mammals must be coordinated with the installation NRM, and OPNAV N45, in addition to the agency notifications above. The Installation NRM should reach out to the Region SME with all of the details of the report. The Region SME will coordinate with

OPNAV N41.

IV. Reporting

Reports shall be submitted to the Navy 30 days before the due date for internal Navy review. The reporting procedures are summarized below.

a. Annual Reports

This report must contain the informational elements from the application, including, but not limited to:

Dates and times (begin and end) of all marine mammal monitoring

Construction activities occurring during each daily observation period, including how many and what type of piles were driven or removed and by what method (i.e., impact or vibratory)

Weather parameters and water conditions during each monitoring period (e.g., wind speed, percent cover, visibility, sea state)

The number of marine mammals observed, by species, relative to the pile location and if pile driving or removal was occurring at time of sighting

Age and sex class, if possible, of all marine mammals observed

PSO locations during marine mammal monitoring

Distances and bearings of each marine mammal observed to the plie being driven or removed for each sighting (if pile driving or removal was occurring at time of sighting).

Description of any marine mammal behavior patterns during observation, including direction of travel

Number of individuals of each species (differentiated by month as appropriate) detected within the monitoring zone, and estimates of number of marine mammals take, by species ( a correction factor may be applied to total take numbers, as appropriate)

Detailed information about any implementation of any mitigation triggered (e.g., shutdowns and delays), a description of specific actions that ensued, and resulting behavior of the animal, if any.

Description of attempt to distinguish between the number of individual animals taken and the number of incidences of take, such as ability to track groups or individuals.

V. Final Report

a. A draft report on all monitoring conducted under the authorization must be submitted within ninety calendar days of the completion of the project or sixty days prior to the issuance of any subsequent authorizations for this project, whichever comes first. This report must contain the informational elements from the application, including, but not limited to:

Dates and times (begin and end) of all marine mammal monitoring

Construction activities occurring during each daily observation period, including how many and what type of piles were driven or removed and by what method (i.e., impact or vibratory)

Weather parameters and water conditions during each monitoring period (e.g., wind speed, percent cover, visibility, sea state)

The number of marine mammals observed, by species, relative to the pile location and if pile driving or removal was occurring at time of sighting

Age and sex class, if possible, of all marine mammals observed

PSO locations during marine mammal monitoring

Distances and bearings of each marine mammal observed to the plie being driven or removed for each sighting (if pile driving or removal was occurring at time of sighting).

Description of any marine mammal behavior patterns during observation, including direction of Travel

Number of individuals of each species (differentiated by month as appropriate) detected within the monitoring zone, and estimates of number of marine mammals take, by species ( a correction factor may be applied to total take numbers, as appropriate)

Detailed information about any implementation of any mitigation triggered (e.g., shutdowns and delays), a description of specific actions that ensued, and resulting behavior of the animal, if any.

Description of attempt to distinguish between the number of individual animals taken and the number of incidences of take, such as ability to track groups or individuals.

Literature Cited

NMFS 2012. Guidance Document: Data Collection Methods to Characterize Impact and Vibratory Pile

Driving Source Levels Relevant to Marine Mammals. Memo from NMFS Northwest Region and Northwest

Fisheries Science Center to Interested Parties. January 31, 2012.