APPENDIX C-SPECIFICATIONS_StaHumboldtBay Dredging_06July23.pdf

DEPARTMENT OF HOMELAND SECURITY

UNITED STATES COAST GUARD

CIVIL ENGINEERING UNIT OAKLAND

OAKLAND, CALIFORNIA 94612-5203

PSN 10229243

SPECIFICATIONS

FOR

MAINTENANCE DREDGING

AT

COAST GUARD STATION HUMBOLDT BAY

SAMOA, CALIFORNIA

Civil Engineering Unit Oakland Initial Date

A. Gilda Barboza

PROJECT MANAGER

AGB 7/6/2023

Constance M. Callahan

CHIEF, ENVIRONMENTAL MANAGEMENT BRANCH

CMC 7/6/2023

TABLE OF CONTENTS

SECTION TITLE PAGE

DIVISION 01 - GENERAL REQUIREMENTS 1

01 10 00 - GENERAL PARAGRAPHS 1

01 33 00 – SUBMITTALS PROCEDURES 8

01 35 29 – HEALTH, SAFETY, AND EMERGENCY RESPONSE PROCEDURES 10

01 35 43 – ENVIRONMENTAL PROCEDURES 13

DIVISION 35 – WATERWAY AND MARINE CONSTRUCTION 22

35 20 23 - DREDGING 22

DIVISION 01 - GENERAL REQUIREMENTS

01 10 00 - GENERAL PARAGRAPHS

PART 1 GENERAL

1.01 SCOPE OF WORK: Provide all labor, materials, and equipment necessary to dredge and dispose of sediment from the mooring basin and boat house areas at U.S. Coast Guard (USCG) Station Humboldt Bay, located in Samoa, California. Dredge up to 3,000 cubic yards (cy) of sediment by mechanical or hydraulic means to the indicated design depth of -8.0 feet Mean Lower Low Water (MLLW) plus 2 feet over depth allowance. The dredged sediment shall be transported by barge and permanently disposed of at the Government furnished Humboldt Open Ocean Disposal Site (HOODS).

All in-water work must be completed during the permitted in-water work window of 1 July 2023 through 15 October 2023 to minimize impacts to federally listed species and protected habitat. The Contractor is responsible for complying with all permit conditions from the Army Corps of Engineers, EPA Conditions for use of HOODS, the National Marine Fisheries Service consultation requirements, and conditions required by the State of California Water Quality Control Board and California Coastal Commission.

1.02 BASIS FOR BIDS

A. Base Bid

Mobilize and demobilize personnel and equipment including the dredge, barge, scow, hydraulic pipeline, and other equipment necessary to complete the work. Prepare a Dredge Operations Plan, conduct pre-and post- dredge hydrographic surveys, and conduct pre-and post-dredge eelgrass surveys and biological monitoring and reporting, and provide a post-dredge project report.

1) Mobilization & preparation of dredging and disposal site(s), and demobilization.

2) Dredging: Dredge the USCG Station Humboldt Bay mooring basin and boat house areas by hydraulic or mechanical means to the indicated design depth of -8.0 feet MLLW plus 2 feet overdepth allowance. Transport the dredged sediment to the Humboldt Open Ocean Disposal Site (HOODS).

The removal, transport and disposal of dredged sediment shall be paid for at the established unit prices per cubic yard (cy) and based on the difference in volume between the pre- and post- dredge hydrographic surveys of the dredge prism. Payment for dredging, including disposal fees, shall not be made for dredging deeper than the allowable overdepth, dredging outside the authorized areas, or dredging and/or disposing of sediment in an unauthorized manner. The estimated unit price dredge quantity is 3,000 cy. This is based upon the volume to dredge to the design depth plus the volume to dredge the allowable overdredge depths as indicated by the hydrographic survey, dated 05 August 2022.

A. Dredge Operations Plan: Submit a detailed dredge and disposal operations plan (DOP) of the entire dredging and dredge sediment disposal operation including a list of equipment, environmental controls, means of transport, and means and locations of intermediate storage or handling of dredge sediment. The DOP is required at least 25 days prior to the start of work and must be approved by the regulatory agencies prior to the start of dredging activities.

3) Pre-Dredge and Post-Dredge Hydrographic Surveys and Computations: Submit results of hydrographic surveys taken by a certified third-party surveyor before and after dredging.

The hydrographic surveys and related drawings must include the dredged prism. The pre-dredge survey submittal is required no later than 25 days prior to dredging operations and the post-survey submittal is required prior to final acceptance of the completed work or 5 days after dredging is completed. The post-dredge survey will be utilized as a formal drawing for the record and payment and will be included in the post-dredge report to be submitted to the regulatory agencies.

4) Pre- Dredge and Post-Dredge Eelgrass Surveys: The contractor shall conduct a pre-dredge and a post-dredge eelgrass survey and provide the reports of findings in a post-dredge biological report. The pre-dredge eelgrass survey shall be completed no later than 5 days prior to dredging. If eelgrass is identified within the dredge footprint, a post-dredge eelgrass survey shall be completed to verify the extent of effects of the dredging action on the eelgrass. The post-dredge eelgrass survey shall be completed within 10 days after dredging. Payment will be made for costs associated with performing a pre dredge and a post-dredge eelgrass survey and producing the reports of findings. Unit of measure is two jobs.

5) Biological Monitoring: Conduct biological monitoring for fish species, specifically the green sturgeon. Payment will be made for costs associated with performing the biological monitoring and preparing a post-dredge biological report. Unit of measure is one job.

6) Post-Dredge Project Report: Within 30 days after the completion of the project, the Contractor shall submit a post-dredge report to document the project’s execution. This report will be submitted to the regulatory agencies to satisfy permit requirements.

1.03 LOCATION: The USCG Station Humboldt Bay 200 New Navy Base Road, Samoa, California.

1.04 SITE INVESTIGATION: Investigate the site per FAR 52.236-3 to ascertain the general and local conditions, which can affect the work or its cost. Since the site is secured, prior arrangements for site visits should be made by contacting the Contracting Officer.

1.05 KICK OFF MEETING: Within 10 days after award, the Contractor shall be available for a project kick-off meeting.

1.06 NOTIFICATION OF START AND COMPLETION OF WORK: The Contractor shall notify the Contracting Officer in writing five (5) business days in advance of the date he intends to commence work, and five

(5) business days prior to the date that work will be ready for final inspection.

1.07 CONTRACTOR'S DAILY REPORT: Complete Form 17-148 "Contractor's Daily Report to Construction Manager" every day there is any type of contractor or subcontractor activity (including equipment or material delivery) at the construction site. The contractor shall include daily calculations of estimated quantity of material dredged and disposed. The daily reports shall be compiled during the week and mailed to the USCG Project Manager at the close of business each Friday.

1.08 FINAL INSPECTION AND ACCEPTANCE: When work is complete and ready for final inspection, submit a written request for final inspection to the Contracting Officer at least 10 working days in advance of the date of final inspection. Final inspection will not be scheduled until all submittals have been approved. Note inspection and acceptance will be required separately for both dredging and disposal.

1.09 CONTRACTOR SECURITY REQUIREMENTS: The Contractor shall provide a list of all on-site personnel, including sub-contractors (including second and third-tier subcontractors) and suppliers, to the Contracting Officer. The contractor shall update this list when changes occur. Contractor personnel not listed may be

VYee Highlight denied access to the USCG facility. Contractor personnel will be restricted to designated working areas. Any personnel violating this policy may lose access to the USCG facility. Contractor personnel shall always have photo identification while working on Coast Guard facilities.

Contractor and delivery personnel may be required to present personal photo identification to gain access to a USCG installation. If identification does not indicate United States citizenship, USCG Security may require proof of the legal right to work in the United States. Contractor and delivery personnel also may be subjected to an immigration status and outstanding criminal warrants check.

The Real ID Act of 2005 established minimum security standards for license issuance and production and prohibits Federal agencies from accepting, for certain purposes, driver's licenses and identification cards from states not meeting the Act's minimum standards. Anyone requiring access to a military facility under this contract, to include subcontractors, who holds a driver's license from any state without approved licenses will be required to provide identification other than that driver's license to gain access. Government IDs annotated with “Federal Limits Apply” will not be accepted for access purposes.

It is the responsibility of the Contractor to ensure that their personnel have federally acceptable personal photo identification and comply with any other requirements for base access.

Contractors shall provide the Contracting Officer's Representative with 24 hours of advance notice of every delivery to the site (e.g., concrete, lumber, parts, etc.) and provide the company name, delivery person, and phone number of the firm(s) making deliveries. All vehicle access to government property requires vehicle registration and proof of liability insurance, otherwise access to the USCG facility may be denied.

At least 7 days prior to commencing work the Contractor shall verify and ensure the USCG Security Office knows of the date and time the work will commence.

1.10 CONTINUITY OF FACILITIES OPERATION: Schedule work to minimize interference with the normal operations at the facility. Notify the Contracting Officer and site contact 3 business days in advance of any shutdowns. Perform all on-site work, including deliveries, between the hours of 7:00 AM and 5:00 PM, Monday through Friday (Federal Holidays excluded), unless otherwise approved by the Contracting Officer and the Unit Commanding Officer.

1.11 CONTRACTOR USE OF PREMISES: The Contractor will be working on a military installation. Become familiar with and obey fire, traffic, and security regulations. Personnel shall not stray form the immediate area of work nor direct avenues of ingress and egress unless authorized in advance by the Contracting Officer.

Contractor shall coordinate dredging operations with the USCG Station Humboldt Bay Command to minimize disruption to the USCG operations and movement of USCG vessels.

1.12 RECYCLING AND DISPOSAL OF REFUSE: Refuse, excess or waste materials resulting from construction operations shall become the property of the Contractor and shall be recycled and/or disposed of off Government property. All disposal shall be done in accordance with federal, state, and local laws and regulations.

1.13 HAZARDOUS MATERIAL IDENTIFICATION: Submit Safety Data Sheets (SDS) for any materials defined as hazardous under the most current revision of Federal Standard 313. One copy of each MSDS shall be submitted to the Contracting Officer’s Representative no later than the delivery date of the product. Two copies shall be submitted to the Contracting Officer.

1.14 SAFETY: During the execution of this contract, the Contractor shall conform to the rules and regulations as set forth by OSHA Safety and Health Standards, 29 CFR Part 1926 - Safety and Health Regulations for Construction. When the standards differ, the more restrictive standard shall apply. The contractor shall provide barriers, temporary fencing, trench covers, etc. wherever work could cause injury to workers, visitors, USCG personnel, or dependents. An Accident Prevention Plan shall be submitted in accordance with Section 01 35 29, paragraph 1.05.

1.15 CLEANUP: The Contractor shall keep the work area, including storage area, free from accumulations of waste materials daily and comply with all federal, state and local regulations pertaining to storage, transport and disposal of wastes. The Contractor shall not use the USCG waste disposal facilities including garbage cans, trash piles, or dumpsters. The Contractor shall remove all debris at the disposal site, which accumulated during the job.

1.16 TEMPORARY FACILITIES:

A. Storage: If needed, the Contractor may be provided a storage area in a location determined by the Contracting Officer. The Contractor shall be responsible for restoring the area to its original condition at the completion of work. The Contractor shall be responsible for protecting materials stockpiled against weather, damage, theft, and other risks of loss. The USCG assumes no responsibility for material or equipment left in the storage area.

B. Sanitary Facilities: There may not be toilet facilities available for Contractor use at the job site. The Contractor shall provide his own facilities, including hand washing facilities, in accordance with 29 CFR 1926, Subpart D, paragraph 1926.51 (c)(1) and (f)(1).]

C. Availability of Utility Services: No commercial utilities are available.

1.17 EXISTING UTILITIES: The existence of any other utility locations and cable crossings is unknown. The authorized dredge footprint and disposal site are not anticipated to contain underground utilities. The Contractor shall verify all utility and cable crossing locations prior to dredging.

1.18 DRAWINGS: Drawings to be used in conjunction with these

specifications are listed below. The drawings are the property of the Government and shall not be used for any purpose other than that contemplated by the specification. The work shall conform to the drawings listed below which form a part of these specifications.

Number Title

No.1 Condition Hydrographic Survey, USCG Station Humboldt

Bay, dated 05 August 2022

1.19 ENVIRONMENTAL REGULATORY PERMITS: The USCG has obtained permits and concurrences from the U.S. Army Corps of Engineers for compliance with Section 404 of the Clean Water Act, the California State Water Board for compliance with Section 401 of the Clean Water Act, the California Coastal Commission for compliance with the Coastal Zone Management Act, and the U.S.

Fish and Wildlife Service and National Marine Fisheries Service for compliance with Section 7 of the Endangered Species Act, Marine Mammal Protection Act, and Magnuson- Stevens Fisheries Conservation and Management Act.

The Contractor shall comply with all requirements under terms and conditions set forth in the environmental permits and authorizations issued for this project. Copies of the environmental permits are provided. The Contractor shall familiarize personnel with the permits issued for this project and comply with all requirements under the terms and conditions set forth therein. Conditions in addition to general best management practices include (but are not limited to) eelgrass protection and biological monitoring (more detail is provided in Section 01 35 43 Paragraph 1.05 Protection of Natural Resources).

The contractor will be responsible for payment of fines resulting from violations of conditions set forth in the above permits.

1.20 SEDIMENT ANALYSIS: The material to be removed is material carried along the shoreline by natural currents, wind, and waves.

Sampling and analysis were completed for this site in July 2022.

Sediment analysis results indicated that the proposed dredged materials contain low chemical concentrations and identified grain-size results containing a total silt percentage of 54.2 percent, while percentage of total sand and clay were 33.1 and

13.1 respectively. The Dredge Material Management Team agencies determined that the project sediment was suitable for unconfined disposal at the HOODS site.

PART 2 PRODUCTS

Not Used

PART 3 EXECUTION

END OF SECTION

01 33 00 – SUBMITTALS PROCEDURES

1.01 GENERAL

A. Forward all submittals, except as stated elsewhere, to the Contracting Officer on CD-ROM or by email within 10 business days from date of award, unless indicated otherwise in this specification. Submittals shall be accompanied with the USCG furnished material submittal form in Microsoft Word Format.

Unless noted otherwise, all submittals shall be provided in an electronic image format. Provide these submittal images to the Contracting Officer, the Construction Manager, and the Contracting Officer's Representative (COR) simultaneously. If the electronic image is insufficient to ascertain submittal acceptability, the Contracting Officer may request a hard copy submittal. The Contracting Officer will e-mail approval or disapproval of submittals, within 10 calendar days after receipt.

B. The Contracting Officer Representative, Construction Manager and Project Manager will review all submittals for compliance with these specifications. The Contracting Officer shall approve submittals before acceptance.

C. Approval of submittals, and corrections or comments made during the review, do not relieve the Contractor from compliance with the requirements of the plans and specifications or permit coordination.

D. The schedule of submittals listed in the submittal register (Table-1) and in the individual sections are the submittals required for this contract. Unsolicited submittals may be returned to the Contractor without review.

1.02 CERTIFICATES OF COMPLIANCE: Certificates of compliance shall be signed by an authorized officer of the manufacturing company furnishing the material which states that the material being furnished meets all requirements of these specifications and referenced specifications.

1.03 DESIGN DRAWINGS: Design drawings shall be provided in .xyz file format and in Adobe Pdf. Drawings shall comply with the National CAD Standards for symbols and layers and shall also comply with USCG standards for font (Romans), font size (0.1-inch minimum height) and title block attributes.

Drawings shall be submitted in electronic media form, with all photos and external reference drawings bound to their respective drawing. Plot styles and fonts used, other than Romans, shall also be included.

Drawings should include name and signature of lead engineer with stamp approval, dates of signature and dates of data collection.

PART 2 PRODUCTS

PART 3 EXECUTION

01 35 29 – HEALTH, SAFETY, AND EMERGENCY RESPONSE PROCEDURES

1.01 SECTION INCLUDES: This section applies to steps taken by the contractor to comply with the health and safety requirements listed herein. The Contractor shall comply with all applicable federal, state, and local laws and regulations. The ultimate responsibility for identifying applicable requirements and protecting contractor employees or sub-contractors rests with the primary contractor.

1.02 APPLICABLE PUBLICATIONS: The publications listed below

form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

A. American National Standards Institute (ANSI):

Z359 Series Fall Protection Code, Version 2 (Z359.0-2007, Z359.1-2007, Z359.2- 2007, Z359.3-2007, Z359.4-2007, Z359.6-2009, Z359.12-2009, Z359.13-2009, Z359.14-2012, and historical Z359.1-1992 (R1999)

B. Environmental Protection Agency (EPA) Regulations:

40 CFR 204 Noise Abatement Program for Construction Equipment

40 CFR 302.4 Designation of Hazardous Substances

C. U.S. Army Corps of Engineers (USACE):

EM 385-1-1 Safety and Health Requirements Manual

D. U.S. Department of Labor Occupation Safety and Health Administration (OSHA) Regulations:

29 CFR 1910.1200 Hazard Communication

29 CFR 1926.106 Working Over or Near Water

29 CFR 1926.453 Aerial Lifts (Construction Specific)

29 CFR 1926 Subpart M Fall Protection

29 CFR 1926 Subpart P Excavations

1.03 REFERENCE STATUTES: The statutes listed below form a

part of this specification to the extent referenced.

Noise Control Act (NCA) (42 U.S.C. §§ 4901 to 4918)

1.04 DEFINITIONS

A. Sediment: Soil and other debris that has been eroded and transported by runoff water.

B. Solid Waste: Rubbish, debris and other discarded solid materials resulting from industrial, commercial, and agricultural operations, and from community activities.

Solid waste may also include non-sewage liquids.

C. Rubbish: A variety of combustible and noncombustible wastes such as paper, boxes, glass, crockery, metal, lumber, cans, and bones.

D. Debris: Includes combustible and noncombustible wastes, such as ashes, waste materials that result from construction or maintenance and repair work, leaves, and tree trimmings.

E. Chemical Wastes: Includes salts, acids, alkalines, herbicides, pesticides, and organic chemicals.

F. Sewage: Wastes characterized as domestic sanitary sewage.

G. Garbage: Refuse and scraps resulting from preparation, cooking, dispensing, and consumption of food.

H. Oily Waste: Includes petroleum products and bituminous materials.

I. Hazardous Material (HM): Chemicals defined by OSHA 29 CFR 1910.1200 and under the U.S. Department of Transportation (DOT) regulations (Title 49 CFR Parts 100 through 199) which are determined by the Secretary of Transportation to present risks to safety, health, and property during transportation. The DOT regulations include requirements for shipping papers, package marking, labeling, transport vehicle placarding, and training of personnel handling hazardous materials.

1.05 Accident Prevention: Submit a copy of your “Accident

prevention” or “Injury and Illness Prevention” in the dredge operations plan.

1.06 Mobile Equipment Operator List: A list of qualified

operators for all mobile equipment that will be brought onto the job site with employee name(s), qualifications, and specific equipment to be operated shall be provided to the Contracting Officer prior to equipment operation.

(This includes forklifts, cranes, motorized lifting device, etc.). This is also to be included in the dredge operations plan.

1.07 NOISE: Make the maximum use of "low-noise-emission

products" as certified by EPA and described at 40 CFR Part 204. No blasting or use of explosives is permitted.

Comply with applicable portions of the Noise Control Act (NCA). The Contractor is responsible for complying with all other federal, state, and local noise control laws and regulations.

1.08 WORKING OVER OR NEAR WATER: When working over or near

water, comply with 29 CFR 1926.106.

PART 2 PRODUCTS

Not Used

01 35 43 – ENVIRONMENTAL PROCEDURES

PART 1 GENERAL

1.01 SECTION INCLUDES: This section applies to all necessary

steps taken by the Contractor to comply with the environmental protection requirements listed herein.

1.02 APPLICABLE PUBLICATIONS: The publications listed below

form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

A. Environmental Protection Agency (EPA) Regulations:

40 CFR 122 National Pollution Discharge Elimination System

40 CFR 261 Identification and Listing of Hazardous Waste

1.03 REFERENCE STATUTES: The statutes listed below form a

part of this specification to the extent referenced.

Clean Air Act (CAA) (42 U.S.C. §§ 7401 to 7642)

Clean Water Act (33 U.S.C. §§ 1251 to 1387)

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (42 U.S.C. §§ 9601 to 9675)

Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) (7 U.S.C. §§ 136 to 139y)

Federal Water Pollution Control Act (CWA) (33 U.S.C. §§ 1251)

Toxic Substance Control Act (TSCA) (15 U.S.C. §§ 2601 to 2654)

Resource Conservation and Recovery Act (RCRA) (42 U.S.C.

§§ 6901 to 6991i)

1.04 ENVIRONMENTAL PROTECTION REQUIREMENTS: Provide and

maintain environmental protection during the life of the Contract to control pollution or to correct conditions that develop during construction. Comply with all

Federal, State, and local laws and regulations pertaining to water, air, soil, and noise pollution.

1.05 PROTECTION OF NATURAL RESOURCES

A. Permits: The USCG has obtained permits from the U.S. Army Corps of Engineers for compliance with Section 404 of the Clean Water Act (SPN-2013-000093), the California Regional Water Board for compliance with Section 401 of the Clean Water Act(WDID No.1B23012WNHU), the California Coastal Commission for compliance with the Coastal Zone Management Act (ND-0004-23), the U.S. Fish and Wildlife Service (2023-00809-S7-001) and National Marine Fisheries Service (WCRO-2023-00135) for compliance with Section 7 of the Endangered Species Act, Marine Mammal Protection Act, and Magnuson- Stevens Fisheries Conservation and Management Act. Copies of the environmental permits are be provided as an Attachment.

The terms and conditions, best management practices and avoidance measures include, but are not limited to, water quality monitoring, eelgrass protection, and biological monitoring.

The Contractor shall comply with all requirements under terms and conditions set forth in the environmental permits and authorizations issued for this project. The Contractor shall familiarize personnel with these, and any other permits issued for this project and comply with all requirements under the terms and conditions set forth therein. The contractor will be responsible for payment of fines resulting from violations of conditions set forth in the above permits.

B. Preserve the natural resources within the project boundaries and outside the limits of permanent work performed under this Contract in their existing condition or restore to an equivalent or improved condition upon completion of the work. Repair or restore to original condition landscape features scarred or damaged by equipment or operations. Obtain Contracting Officer's approval before repair or restoration. Confine construction activities to areas defined by the work schedule, drawings, and specifications. Federal Acquisition Regulation clause 52.236-9 applies.

C. Eelgrass Vegetation: An eelgrass survey was conducted in June 2022 (Merkel & Associates 2022) to identify eelgrass within the vicinity of the proposed dredge area. The eelgrass survey identified approximately 8 square meters of eelgrass vegetation located within the dredge footprint. Eelgrass throughout the survey area was determined to be generally healthy, with light sedimentation and no evidence of disease (Merkel & Associates, Inc. 2022).

According to the eelgrass survey, proposed dredging activities could directly disturb eelgrass along the shoreline between the boathouse and the pier. Dredging may also have the potential to indirectly disturb this patch of eelgrass with increased turbidity, which eelgrass is extremely sensitive to.

Vessel operators will not drop anchors/spuds within identified eelgrass beds. Further, a 5-foot buffer around eelgrass beds will be maintained by vessel operators and dredge equipment. If possible, the Contractor shall deploy a full-length turbidity curtain to minimize turbidity effects to nearby eelgrass bed. Further, the Contractor shall stake or mark eelgrass beds prior to dredging activities to avoid removal.

D. Protection of Fish: Fish with state and federal protection are known to have potential to occur in the vicinity of the dredge footprint, including longfin smelt, salmonids, and green sturgeon. A biological monitor shall be onsite to observe and stop work as needed if fish species are found to be present.

E. Except in areas indicated to be cleared, do not remove, cut, deface, injure, or destroy vegetation without special written permission from the Contracting Officer.

F. Construction equipment is to be kept in good repair, without leaks of hydraulic or lubricating fluids. If such leaks or drips do occur, they shall be cleaned up immediately. Drip pans shall be utilized when vehicles are parked. Confine equipment maintenance and/or repair to one location. Control runoff in this area to prevent contamination of soils and water.

G. At or before Contract completion, obliterate all signs of temporary construction facilities such as haul roads, work areas, structures, foundations of temporary structures, stockpiles of excess or waste materials, and all other vestiges of construction. Temporary roads, parking areas, staging areas, and similar temporary use areas where excavation has been accomplished shall be graded in conformance with surrounding areas. Restore all disturbed areas to their original condition.

H. For all work in or over water habitats, provide a debris boom. Take precautions to preclude construction materials from entering the water and immediately remove any material that enters the water in the work area.

Report spills of any liquids into the water habitat and take steps to preclude spread or dissipation of spilled liquids. Contractor must have a spill response kit available.

1.06 EELGRASS PRE-DREDGE and POST-DREDGE SURVEYS AND

PROTECTION: The Contractor shall perform eelgrass surveys to determine the presence of eelgrass (Zostera marina and Zostera pacifica) within the dredge footprint and surrounding area, and to provide a comparative and quantitative assessment of the eelgrass communities within the area of potential effect prior to, and after dredging. The surveys shall be conducted in conformance with the requirements of both the California Eelgrass Mitigation Policy (CEMP) (NOAA 2014). The eelgrass surveys shall use at least a 45-meter buffer area outside of the dredge footprint perimeter. The report shall include calculated square meters of eelgrass in the project and buffer areas; a map that clearly show the location(s) of any eelgrass beds; and a brief discussion of the survey methods, survey results relative to the survey parameters (spatial distribution, aerial extent, percent vegetated cover, and turion density), observation of invasive species (Caulerpa sp.), and recommendations.

Data recording sheets shall also be included in the report.

Submit the name and qualifications of the Firm that will conduct the eelgrass surveys for approval prior to the kickoff meeting. The pre-dredge eelgrass survey shall be performed no more than 5 days prior to the start of construction and shall record all presence of eelgrass (eelgrass density and eelgrass extent). Dredging cannot initiate until after the survey has been completed. A post-dredge eelgrass survey shall be completed within 30 days after completion of dredging, or during the appropriate growing season following dredging activities, and shall document the presence/absence of eelgrass and any potential effects from the dredging operations. The results of the eelgrass surveys shall be submitted in report form no later than 45 days after completion of work.

If possible, the Contractor shall deploy a full-length turbidity curtain to minimize turbidity effects to nearby eelgrass bed. Further, the Contractor shall insert stakes into the substate to demarcate the location of the eelgrass beds within the dredge footprint so that the dredge operator might be able to better avoid impacting the eelgrass. If these areas are unavoidable because they limit the extent of dredging necessary to fulfill the project purpose and need to provide safe berthing and transit depths for the USCG vessels, these areas may be dredged.

1.07 BIOLOGICAL MONITORING FOR GREEN STURGEON: Submit the name and qualifications for a Biological Monitoring Firm 10 days before commencement of dredging. Do not commence monitoring and dredging until the Contracting Officer has approved the selected firm. The biological monitoring firm must utilize qualitied staff and services that include:

A. Provide a trained biologist with experience in locating and monitoring of fish species, specifically the Southern Distinct Population Segment (SDPS) Green Sturgeon. The monitoring is required for SDPS green sturgeon but shall also include monitoring for salmonids and longfin smelt.

Ensure the biologist can assist with the development and execution of an environmental awareness training and provide continual education and guidance to the Contractor throughout the duration of construction activities. Ensure the biologist is on site during activities with the potential to impact federally listed species. Multiple biological Monitoring firms may be used to satisfy the requirements of the qualifications.

B. Periodic Monitoring and Report: A biological monitor shall be onsite to observe and stop work as needed if fish species are found to be present during dredging activities. The monitoring would be conducted visually specifically when project-related vessels are running propellers and/or a cutterhead, but not required during times propellers are not running (for example, when a clamshell/excavator might be working from a stationary barge). The observer shall scan the water's surface near the area(s) of the active propeller(s) watching for sturgeon and noting any observations and potential disposition if relevant.

In Humboldt Bay, SDPS green sturgeon would either be adult or subadult life stages which are rather large fish (roughly 1-2 meters in length), and oftentimes sturgeon are observed breaching/jumping in Humboldt Bay. After being struck by a propeller, sturgeon often struggle at the surface of the water for a period and can be readily observed. All observations, whether jumping/breaching a distance from project-related vessels, or for individuals who may be suspected to be struck by a propeller or cutterhead should be summarized in a post-dredge monitoring report.

Include daily observations and monitoring of fish species within the dredge footprint in daily logs. Submit a post-dredge biological monitoring report no later than 30 days after completion of the work summarizing the daily reports and overall summary of the project.

1.08 BEST MANAGEMENT PRACTICES: The following list are BMPs

that have been included in the permit applications and have been agreed upon by the USCG and regulatory agencies. The Contractor shall implement each of the BMPs to comply and avoid impacts to natural resources.

• All work will occur in the ESA-established in-water work window (July 1 – October 15).

• A pre-dredging eelgrass (Zostera marina and Zostera pacifica) survey will be conducted during the growing season and up to a week prior to the start of each dredging episode.

• Vessel operators will not drop anchors/spuds within identified eelgrass beds. Further, avoidance of eelgrass will be maintained by vessel operators and dredge equipment.

• Best management practices would be employed to prevent impact to two small clusters of eelgrass (totaling 8 square-meters [m2] of vegetated cover, of which approximately 4.8 m2 are within the USCG’s permitted dredging area for long-term maintenance, Figure 2, Enclosure C) near the proposed dredging area.

• If practicable (e.g., without impact to existing beds or dredging operations), the work area will be surrounded by a turbidity curtain to reduce impacts to water quality from suspended sediments and/or act as a potential BMP to prevent fish from entering the dredging area during suction dredging activities.

• If a silt curtain cannot be deployed, light monitoring shall be conducted by the Contractor in accordance with light monitoring protocol found in Appendix 3 (starting on page 68) of the U. S. Army Corps of Engineers, San Francisco District and National Marine Fisheries Service, Southwest Region Programmatic Consultation (https://media.fisheries.noaa.gov/2021- 11/efhdredgeprogrammatic-071410-final.pdf).

• Vessel operators will follow designated speed zones to and from the project area.

• The potential for grounding will be limited by controlling contractor vessel draft and movements.

• During transport and handling of sediment, containment measures will be used to minimize spillage. The USCG will require the contractor to conduct a surface debris survey prior to dredging.

• If needed during offloading, metal spill aprons, upland spill control curbing and collection systems, and other spill control measures will be implemented.

If a bucket is used, a dribble apron will be used.

• The contractor will use a GPS unit to ensure that material is removed from the correct locations. • The contractor will not be allowed to excavate beyond the maximum depth.

• No bottom stockpiling or multiple bites of the clamshell bucket will be allowed.

• Over-dredging at the base of a slope will not occur.

• If mechanical dredging is employed, the dredge bucket will not be overfilled. The dredge bucket will swing directly to the barge after it breaks the water surface using the minimal swing distance.

https://media.fisheries.noaa.gov/2021-11/efhdredgeprogrammatic-071410-final.pdf https://media.fisheries.noaa.gov/2021-11/efhdredgeprogrammatic-071410-final.pdf

• The dump scow will be filled to no more than 80 percent capacity to prevent spillage during transport.

• Although not anticipated to be necessary, surface booms, oil-absorbent pads, and similar materials will be onsite to contain any sheen that may occur on the surface of the water during dredging.

• A debris boom will be installed during in-water construction. Any debris accidentally discharged into the water will be collected, transported to, and disposed of, at an appropriate upland disposal site, or recycled, if appropriate.

• The contractor shall utilize only clean construction materials suitable for use in the aquatic environment.

• The contractor shall ensure no debris, soil, silt, sand, sawdust, rubbish, cement, or concrete washings thereof, oil or petroleum products, from construction shall be allowed to enter or be placed where it may be washed by rainfall or runoff into waters of the U.S.

• Upon completion of the project the contractor shall completely remove all excess material or debris from the work area and recycle or dispose of these materials in an appropriate upland location.

• No re-fueling of equipment shall occur where it could enter waters of the U.S.

• Prior to dredging, a dredging and disposal management plan will be prepared by the contractor that describes BMPs that comply with local, state, and federal regulations and to address the following, should they occur:

o Bottom scour from propeller wash.

o Loss of submerged or emergent vegetation from propeller wash and/or excessive wake.

o Accidental material spillage.

o Sediment and benthic community disturbance from accidental or intentional barge grounding or deployment of barge spuds or anchors; and 5.

Hazardous material spills.

• Dredging will be completed to a stable slope to maintain the integrity of the riprap-armored banks.

• If suction dredging is employed, the cutterhead will be kept as close to the sediment surface as possible or below the surface to minimize impacts on fish. The suction dredge will not be operated while in the water column to minimize entrainment of sensitive species within the water column. Overflow to the hopper will be minimized to reduce turbidity in the surrounding waters.

1.09 EROSION AND SEDIMENT CONTROL MEASURES:

A. Borrow pits are not permitted on Government property.

B. Provide necessary controls to prevent visible or measurable erosion from leaving the construction site.

C. Provide temporary protection for erodible soils.

Immediately protect side slopes and back slopes upon completion of rough grading. Plan and conduct all earthwork to minimize duration of exposure of unprotected soils.

1.10 CONTROL AND DISPOSAL OF WASTES: With the exception of

materials specifically indicated or specified to be salvaged for reuse in construction, or turned over to the Government, all wastes and demolished materials become the contractor's property and shall be removed from the job site daily.

PART 2 PRODUCTS

Not Used

DIVISION 35 – WATERWAY AND MARINE CONSTRUCTION

35 20 23 - DREDGING

1.01 SECTION INCLUDES: This section applies to all work

required for dredging and disposal of the sediment.

Perform all operations necessary for the removal of all sediments to the required dimensions, the disposal thereof, and all operations thereto.

1.02 SUBMITTALS:

A. Dredge Operations Plan: Submit a detailed dredge and disposal operations plan (DOP) of the entire dredging and dredge sediment disposal operation. The DOP shall be a document that explains in writing the exact procedures to be followed and materials and equipment to be used by the Contractor to accomplish the required work. It shall include a list of equipment, environmental controls, means of transport, and means and locations of intermediate storage or handling of dredge sediment.

The DOP shall adhere to the permit requirements from the U.S. Army Corps of Engineers and shall include, at a minimum:

a) The Contractor’s proposed dredging method.

b) Detailed list of equipment to be used.

c) The pre-dredge hydrographic survey with volume calculations.

d) Procedures for conducting the pre- and post-dredge hydrographic surveys.

e) Procedures for marking the horizontal and vertical dredge limits.

f) Procedures for monitoring the progress and quantity of dredging during the execution of the work.

g) Identification of the disposal location(s).

h) Procedures for transporting the sediment to the disposal location.

i) Notice to Mariners; and

j) Solid debris management plan.

Provide plans and procedures should gale force winds or higher be forecast. Precautions shall include, but not be limited to, closing all openings, removing all loose materials, tools and equipment from exposed locations, anchoring and tying down barge, dredge, and/or pipeline.

This submittal is required 25 days prior to start of work and must be approved by the Corps prior to initiating the work.

B. Hydrographic Surveys: Submit results of hydrographic surveys taken before (pre) and after (post) dredging performed by a third-party certified surveyor. The hydrographic surveys and related drawings must include the dredged prism. The pre-dredge survey submittal is required no later than 25 days prior to dredging operations and the post-survey submittal is required prior to final acceptance of the dredging work or 5 days after dredging is completed. More information provided in Section 1.06, below.

C. Dredge Volume Calculations: Submit results of actual gross volume of dredged sediment. Cover sheet shall be signed, dated, and sealed by licensed surveyor.

D. Post-Dredge Project Report: Within 30 days after the completion of the dredging, the Contractor shall submit a post-dredge report to document the project’s execution.

This report will be submitted to the regulatory agencies to satisfy permit requirements. At a minimum, the report will include calculated final dredging volume based on the pre and post dredge surveys, copies of all hydrographic surveys, maps of the dredging footprint, dates of commencement and completion of work, any noncompliance issues, required monitoring logs, environmental permitting compliance documentation, and the disposal location and operations of the dredged sediment.

1.03 ARTIFICIAL OBSTRUCTIONS: The USCG anticipates debris such as, but not limited to, metal bands, pallets, pieces of broken cable, rope, hose, and broken piles. The Government has no knowledge of existing wrecks or wreckages. Prior to dredging, the Contractor shall survey the dredge area and remove debris encountered. Debris removed from the dredge area shall be removed from the water. Explosives shall not be used under any circumstance. Disposal of debris shall be the responsibility of the Contractor and disposal shall be outside the limits of the USCG Station Humboldt Bay property.

1.04 QUANTITY OF MATERIAL: The total estimated amount of

material to be removed from within the specified limits, including side slopes, is 1,530 cubic yards. The estimated quantity for bidding purposes shall be 3,000 cubic yards. The quantity listed is an estimate only.

Within the limits of available funds, complete the work specified whether the quantity involved is greater or less than that estimated.

A. Overdepth Dredging: Due to unavoidable inaccuracies in the dredging processes, different types of equipment, operator skill, and material composition, it is likely that material beyond the specified limits will have to be removed. The cost for the material removed beyond the specified limits, and disposal, although necessary to achieve the specified limits, will not be paid as a separate item, but should be accounted for in the cost to dredge the material within the specified limits. To cover unavoidable inaccuracies of dredging processes, removal of sediment to a depth of two feet below the elevation -

8.0 feet MLLW depth specified and within the dredging limits will be allowed.

B. Side Slopes: Side slopes at the side limits of the dredge area shall be 2:1 (horizontal: vertical). Project the side slope from the dredged bottom elevation at the limits of the dredge area line outward until it intersects the existing bottom of the adjacent waterway.

Dredging on side slopes shall follow, as closely as practicable, the lines indicated on the reference drawings.

C. Slides: In the event sliding occurs in any excavation after its completion but prior to its acceptance, the Contractor shall remove such portions of the slide at no additional cost to the Government. Particular attention shall be provided to the slope nearest to the boat haul out.

1.05 ENVIRONMENTAL PERMITS AND PROTECTION REQUIREMENTS: The

Contractor shall comply with conditions and requirements of Federal and State permits issued for the project.

1.06 HYDROGRAPHIC SURVEYS: The Contractor shall provide

hydrographic surveys before and after dredging. The Contractor shall employ an independent, third party, surveyor licensed to perform such work by the State of California to perform the hydrographic surveys. The Contractor shall establish and provide all buoys, ranges, tide gauges, and other controls necessary to accomplish the work and facilitate inspection.

Hydrographic survey procedures (positioning modes, EPS calibration, accuracy requirements, depth measurements calibration, and data reduction, adjustment, processing and plotting, etc.) shall conform to industry standards similar to, or more stringent than, those found in Army Corps of Engineers Manual EM 1110-2-1003 for Hydrographic Surveying and published November 30, 2013 (http://www.publications.usace.army.mil/USACEPublications /EngineerManuals.aspx). The contractor is responsible for installing any survey points required and shall include that information on the drawings. If necessary, a tide board shall be installed and will remain at the facility.

The survey shall locate the shoreline including mean higher high water (MHHW) and MLLW and show it on the cross section of the survey drawing. Locate all in-water structures, outfalls, cable crossings or other man-made features within or adjacent to the dredge footprint and include these structures within the hydrographic survey drawing. Drawings shall be provided in AutoCAD version 2020 file format (.dwg and. xyz) and in Adobe Pdf.

Additionally, ensure the drawings can be legibly printed on 8.5’x11’, as requested by regulatory agencies.

The drawings shall include areas to be dredged with over depth allowances; existing depths; cross sections, estimated quantities to be dredged for the project; and estimated quantities for over depth. Include the Corps permit number, dates of dredging commencement and completion, and actual quantities dredged (identify project depth and over depth quantities).

The drawings shall include, at a minimum, the following features:

a) Include the dredge footprint overlaid on aerial Imagery.

b) NAD83 coordinate grid ticks on the drawings.

c) Water depth corrected to MLLW.

d) Contour lines every one (1) foot.

e) Soundings every five (5) feet.

f) Elevations shall be determined to the nearest tenth of a foot at horizontal intervals of no more than 10 feet.

g) Contour lines for dredging limit should be bold or clearly marked.

h) Contour lines for dredging limit should be bold or clearly marked.

i) Shoreline and/or structural features (i.e., Docks).

j) Dredge boundary coordinates legend.

k) Typical cross section(s) of the dredge footprint on the drawing.

l) Reference key map in the drawing depicting location of the Coast Guard unit.

m) Coast Guard Corps Permit Number (Corps No.

NWS2021-246)

n) Notes describing survey information (dates of survey, dates of dredging commence and completion, volume calculations to -10ft plus 1ft. and 2 ft. over depth, and names of surveyors and licensed engineer); and

o) Signature and stamp of licensed engineer.

The Contractor shall be responsible for addressing questions about survey methods, depths, and quantity calculations and shall allow for revision based on comments/edits from the USCG, prior to finalizing.

A. Pre-dredge Survey: A pre-dredge hydrographic shall be performed no later than 25 days prior to dredging. Th e survey shall encompass the area to be dredged (dredge footprint), including side slope of areas that extend upland. The Contractor shall take soundings throughout the dredge area on lines running transversely to the direction of the channel and/or the primary direction of boat movement. The soundings shall be corrected to mean lower low water (MLLW) and shall be indicated by the Contractor on the Government-provided copy of the contract drawings.

B. Cross Sections: The Contractor shall prepare cross-sections of the dredging area running transversely to the direction of the channel and/or the primary direction of boat movement at 25-foot (max) intervals. Each cross section shall show the mudline surface contours and the specified dredge limits and calculate the volume of material between the two, indicating the amount of material to be dredged. Submit cross-section and volume computations data together with the pre-dredge surveys.

C. Post-dredge Survey: No later than 5 (five) days after completion of all the dredging work, the Contractor shall resurvey the area as specified for the Pre-Dredge Survey and Cross-Section paragraphs and calculate the actual volume of material removed from within the specified limits. Submit survey plan, cross-sections, and computations to the Contracting Officer. A comparison between the Contractor’s Pre- and Post- dredge survey results shall be the basis for determining the final dredge volume to be paid at the contract unit price.

1.02…