Attachment_7_USGS_Fish_Deterrent_Decommissioning_Plan.pdf

United State Geological Survey (USGS)

Keokuk Acoustic Deterrent System Decommissioning (DCx)

Plan

IMEG #20001422.00

i

R E V I S I O N H I S T O R Y

Issued ............................................................................................................................................. 4/26/2021

T A B L E O F CO N T E N T S

1.0 | OVERVIEW

Project Introduction

General Building Information

Abbreviations and Definitions

2.0 | DECOMMISSIONING PLAN

Systems to be Decommissioned

Restoration Strategy

3.0 | DECOMMISSIONING PROCESS

Decommissioning Process

Speaker Weldment

Hydrophone Brackets

Buried Conduits

Conduits on Grade

Cabling Installed in Construction Joints

Conduits Attached to Concrete

Cables Strapped to Railings

Wall Penetrations

Metal Panel Penetrations

Cables Strapped to Clips

Concrete Box Trenches

Drilled Concrete Conduit

Power Distribution

1.0 | Overview

Project Introduction

The purpose of this Decommissioning plan is to document the effort required to remove the fish deterrent system being installed at Lock and Dam 19 and to restore the lock to the conditions that existed prior to this project.

General Building Information

Owner: USACE

Project: Keokuk Acoustic Deterrent System operated by the USGS

Location: Keokuk, Iowa - Lock and Dam 19

Building Type: Lock and Dam

Abbreviations and Definitions

A/E Architects and Engineers

AHJ Authority Having Jurisdiction

ASI Architects Supplemental Instructions

Cx Commissioning

CIL Commissioning Issues Log

CCD Construction Change Directive

CxA Commissioning Authority

Cx Plan Commissioning Plan

CM Construction Manager

TCC Temperature Controls Contractor

EC Electrical Contractor

EOR Engineer of Record

FO Field Observation Report

FPT Functional Performance Test

GC General Contractor

IECC International Energy Conservation Code

MFR Manufacturer

MC Mechanical Contractor

MM Maintenance Manager

O&M Operation and Maintenance

QA/QC Quality Assurance/Quality Control

RFI Request for Information

SOO Sequence of Operation

Subs Subcontractors to General

Staff Facility/Operations/Maintenance Staff

TAB Testing, Adjusting, and Balancing Contractor

Keokuk Acoustic Deterrent System Cx Plan

April 26, 2021

2.0 | Decommissioning Plan

Systems to be Decommissioned

The following systems will need to be removed as part of the decommissioning.

Electrical Systems and Equipment

▪ Telemetry System

▪ Acoustic Deterrent System

▪ Power Distribution

▪ Structural components supporting the electrical equipment

Restoration Strategy

The intent of this document is to identify the work needed to restore the site to the conditions that existed prior to the project. The intent is to restore the site to the pre-work conditions as closely as possible, realizing that exactly as before is not possible. Pre-work conditions were documented by photographs prior to the beginning of the work effort. Refer to the Pre-Condition photo collection for the existing conditions record.

It is understood that at the time of decommissioning there may be changes that have occurred to the site, the standards enforced by the USACE, or other priorities of the government that may change the desired outcome or means and methods to be deployed. This document is intended to be a guide in the development of the decommissioning effort, but not a final decision on the exact scope. This document will, by necessity, need to be revisited and revised to identify the exact decommissioning scope. In addition, there are some aspects of the decommissioning where there may be options to the methods deployed and it will be necessary to identify which options are to be used at which locations.

April 26, 2021

3.0 | Decommissioning Process

Decommissioning Process

In general terms, the decommissioning process is to remove all of the cabling, conduit, weldment, brackets and supports that were installed for the project and patch all concrete that was impacted by the installation. All disturbed grade is to be restored to original condition including grade, slope, and vegetation.

For a complete record of the work performed, refer to the contractors as-built documents. In the simplest sense, the decommissioning plan is to remove everything that was installed and restore the site to pre-work conditions.

Many of the cables and equipment that were installed are expected to be reused after this project. The removal of cabling and equipment must be done with the utmost care to prevent damage to the cabling or equipment, and to return the cabling and all equipment to the government.

Speaker Weldment

The entire speaker weldment is to be removed by unbolting the brackets that hold the weldment to the floor of the lock. Brackets are to be removed, and bolts are to be ground flush or removed, if possible.

Photos of the installed weldment, underwater, are available for viewing.

Hydrophone Conduits and Brackets

The steel tubes and brackets that were installed to hold and protect the hydrophones are to be removed. Bolts, brackets, straps or other fasteners are to be removed or ground flush if they cannot be removed.

Photos of the installed, underwater, conduits are available for viewing.

Buried Conduits

Where conduits were buried, the entire conduit run is to be removed from the ground and the trench restored to original grade. Seed, with straw protection and erosion control or sod, should be provided to restore the vegetation to pre-work conditions. Cables should be removed before demolition of the conduit.

The government may opt to abandon some conduit in place. A decision at the time of decommissioning will need to be made on which conduit is to be removed and which is to be abandoned in place.

April 26, 2021

Photo 1 - Direct Buried Conduit in Victory Park, downstream of the lock and dam

Conduits on Grade

Where conduits were installed on grade, the entire conduit run is to be removed. Seed, with straw protection and erosion control or sod, should be provided if there is significant dead grass to restore the vegetation to pre-work conditions. Cables should be removed before demolition of the conduit.

Photo 2 - Conduit at Grade

Cabling Installed in Construction Joints

Where cabling was installed in existing construction joints, remove the sealant and backer rod to remove the cables. Reseal the construction joints with approved material, including new backer rods.

Photo 3 - Cable in Construction Joint Before Sealant was Applied.

Conduits Attached to Concrete

Where cabling was installed in conduits, pull boxes or other cable protection that is attached to the concrete walls or deck, the entire conduit system shall be removed. All brackets are to be removed. Any anchors or bolts should be removed, and the holes filed with an approved filler, such as SikaGrout 212 cementitious grout, poured or injected by nozzle into abandoned bolt holes. Finish by wet brushing excess off surrounding concrete before it sets. When bolts or screws cannot be removed, or where the government determines that removing the bolts may cause more damage to the concrete, the bolts or screws shall be ground flush.

Photo 4 - Conduit attached to Concrete

April 26, 2021

Cables Strapped to Railings

Where cables are strapped to existing conduits, railings or fences, the cables are to be removed by removing the plastic or metal bindings. Care should be used in removing the strapping to not damage the jackets of the cables or cutting into the coating on the railings or other supports.

Wall Penetrations

Where cables were installed through existing walls, remove the cables and fill the holes with

SikaGrout 212 or similar non-shrink cementitious patch material, mixed to proper consistency to push into, and fully fill, the core holes.

Photo 5 - Wall Penetration

Photo 6 - Wall Penetration

Metal Panel Penetrations

Where cables exited or entered the cylinder house, a weather head was installed in an existing metal panel covering a wall opening. Once the cables are removed, replace the entire metal panel covering and seal weather tight.

Photo 7 - Weather Head

Cables Strapped to Clips

Where cables were installed with the use of metal clips, remove the cables by removing the plastic or metal bindings. Remove the metal clips and patch the holes with approved filler such as SikaGrout 212 mixed to a proper consistency to avoid running, then injected into the holes and wet brushed as required.

Photo 8 - Cable Attached to Wall Clip

Concrete Box Trenches

There are many locations where the cabling is installed in box conduits. At these locations, the concrete was cut and covered with a metal deck plate. The deck plate is to be removed to deinstall the cabling and the concrete deck is to be restored. Three options for restoring the deck have been identified. The government will need to decide at the time of decommissioning which of these options should be used at which locations or develop other options.

Photo 9 - Concrete Box Trench

Option 1: Patch with concrete. Use bag mix, non-shrink concrete such as SikaCrete 211, a one component concrete site mixed with water. This option is best suited where the existing concrete is sound and in good condition.

Option 2: Patch with concrete where existing contraction joint exists in the underlying concrete.

Use the same SikaCrete 211 mix, but form in the expansion joint in the patch, in line with the underlying, existing joint. Use compressive rigid Styrofoam as a spacer at the joint and finish with the same backer rod and sealant at the joint surface, as described above.

Option 3: Reinstall the deck plating. There may be locations where the government determines that the best course of remediation is to leave the deck plates in place. This would be where the box conduits may be useful for other operations, or where restoration will be made in a future project and not part of the decommissioning of the system.

April 26, 2021

Drilled Concrete Conduit

An 8” diameter vertical cable path was drilled into the wall of the lock for the cables to pass down to the weldment. This vertical core connected to a short 16” diameter horizontal core through the face of the lock wall at the lock floor. This hole is to be restored by installing formwork on the wall underwater over the 16” diameter core hole, then placing concrete down the 8” diameter core hole by tremie method. Water in the core hole is to be pumped as the concrete is placed, eventually removing the floating water on top of the wet concrete being placed. This should be performed in lifts of 10 foot maximum height, so as to avoid excessive wet concrete fluid pressure on the bottom form. The form should be installed with a gasket so as to avoid any concrete flowing out of the joint between existing concrete wall and form. This concrete should be a pumpable 4,000 psi mix with 6% air entrainment +/- 1% . The surface of the new concrete should be brushed to provide slip resistance, and be flush with existing concrete. Wet concrete and slurry should be cleaned off the surrounding, existing concrete with water and brush to provide a clean surface when concrete is cured.

Power Distribution

All power distribution equipment downstream of the transformer and panel that was installed should be removed, including boxes, conduits, brackets, wiring, and supports. Repair any wall penetrations and bolt holes in a manner similar to the methods described above. Plug openings for any conduit that are removed in the process on existing electrical panels to remain.

The government may decide to keep some of the power distribution in place for future use. Any electrical installation that is kept is to be maintained operational.

Prepared by Michael Vanden Berg, PE, CxA

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