Keystone Dam Report of ROV and Bathy Inspection 2020 FINAL.pdf

REPORT OF ROV /BATHYMETRIC INSPECTION

KEYSTONE LAKE, ARKANSAS RIVER, KANSAS

July 26-27, 2020-ROV Inspection

August 22-23, 2020-Bathymetric Survey

Table of Contents

AUTHORITY ________________________________________________________________________________ 3

PURPOSE AND SCOPE _______________________________________________________________________ 3

KEYSTONE DAM DESCRIPTION ______________________________________________________________ 3

SUMMARY OF PROCEDURE FROM ROV INSPECTION ________________________________________ 3

SUMMARY OF FINDINGS FROM ROV REPORT ________________________________________________ 4

AREAS OF CONCERN ________________________________________________________________________ 5

BATHYMETRIC SURVEY OF KEYSTONE DAM ________________________________________________ 5

UPSTREAM AND DOWNSTREAM BATHYMETRIC AREAS _____________________________________ 5

PERSONNEL CONDUCTING INSPECTION _____________________________________________________ 5

POINT OF CONTACT ________________________________________________________________________ 5

APPENDIX I – REPORT OF THE ROV SURVEY _________________________________________________ 6

EQUIPMENT ________________________________________________________________________________ 6

INSPECTION NOTES TERMINOLOGY AND DEFINITIONS ______________________________________ 6

• Debris _______________________________________________________________________________ 6

• Sediment _____________________________________________________________________________ 6

• CS __________________________________________________________________________________ 6

• Void _________________________________________________________________________________ 7

• Feature ______________________________________________________________________________ 7

• Crack ________________________________________________________________________________ 7

• Joint _________________________________________________________________________________ 7

• Significant Features ____________________________________________________________________ 7

• Miscellaneous Notes ____________________________________________________________________ 7

KEYSTONE DAM INSPECTION _______________________________________________________________ 9

KEYSTONE UPSTREAM ________________________________________________________________________ 11 North intake ______________________________________________________________________________ 11 South Intake ______________________________________________________________________________ 13 Tainter Gate _____________________________________________________________________________ 13 Sluice Gates ______________________________________________________________________________ 15 Bulkhead ________________________________________________________________________________ 16 Downstream _____________________________________________________________________________ 17 Powerhouse Tailraces ______________________________________________________________________ 17 Stilling Basin _____________________________________________________________________________ 22 End sill __________________________________________________________________________________ 26

SONAR PLOT INTERPRETATION – TRITECH MICRON _______________________________________ 27

ROV SPECIFICATIONS ___________________________________________________________________________ 28 vLBV-300 MiniROV System __________________________________________________________________ 28

VISUALSOFT DVR SYSTEM ____________________________________________________________________ 29 USING THE DATA REVIEWING PROGRAM: VISUALREVIEW.EXE ________________________________________ 31

Hard Drive Contents _______________________________________________________________________ 31 Opening the Viewer Program ________________________________________________________________ 31 Loading Data into Visual Review _____________________________________________________________ 31 Review Data _____________________________________________________________________________ 32

PILOT NOTES _________________________________________________________________________________ 33 Upstream Powerhouse _____________________________________________________________________ 33 Tainter Gates _____________________________________________________________________________ 33 Stilling basin _____________________________________________________________________________ 36 Tailrace _________________________________________________________________________________ 37 Bulkhead ________________________________________________________________________________ 38 Appendix II – Report from Bathymetric Survey __________________________________________________ 39

Authority

The inspection was completed in accordance with CESWD-CO-OR, 19 September 1984, subject:

Inspection of Stilling Basins” and “ER 1110-2-1156, Safety of Dams – Policies and Procedures, 31 March

2014, subject: Guidance on Scheduling and Conducting Periodic Assessments, Periodic Inspection, and

Training on Civil Works Structures. Hibbard inspected the upstream and downstream side of the dam at

Keystone Lake on July 26-27, 2020 using a remotely operated vehicle (ROV). On August 22-23, 2020, a bathymetric survey by Tuck Mapping Solutions, Inc. and subcontractor ESP Associates, Inc.

Purpose and Scope

The scope of the project was to inspect Keystone Dam for deficiencies by video, sonar, and survey in order to provide the Corps of Engineers with a damage evaluation and recommendations for repair as authorized in Section 1. The bathymetric survey was completed to provide a mapping of the ground surface below the water level for an area specified as 150 feet upstream of the dam structure, the stilling basin and 300 feet downstream of the end sill in the outlet channel.

Keystone Dam Description

Keystone dam’s embankment is constructed of rolled earth-filled material. The spillway is a gated, concrete, ogee weir with a net width of 720-feet, surmounted by eighteen (18) Tainter gates. The spillway is also equipped with nine (9) 5.5- by 10-foot sluices located between alternate intermediate piers. The power intake structure is located between the spillway and the left non-overflow section and includes two

(2) penstocks, 27-foot diameter each, controlled by two (2) 14- by 30-foot gates.

Summary of Procedure from ROV Inspection

The areas of the ROV inspection include the following in accordance with the SOW, for further details please see attached ROV inspection report in the Appendix. All units in this report are in feet in accordance with the SOW.

a. Upstream – Spillway. Inspected the sluice gates, the condition of the concrete near the sluice gates, inspect the sluice gate bulkhead slots. Inspected the Tainter gate stoplog recesses for spalling concrete, obstructions, or other deficiencies. Inspected the weir for undercutting and erosion.

b. Downstream – Stilling Basin. Inspect the floor, walls, and baffles of the stilling basin for erosion, cavitation, and exposed rebar. Estimate quantities of debris in the stilling basin and estimate depths of erosion in the floor and walls. Inspect the upstream and downstream sides of the end sill for undercutting and erosion. Provide an estimate of the depth of erosion on the downstream side of the end sill. Create a Bathymetric survey of the stilling basin and 300 ft. downstream of the end sill.

c. Powerhouse tailrace. Inspect the draft tube gate slots for spalling concrete, cavitation, and obstructions. Inspect the tailrace slab for spalling concrete, erosion, and debris. Inspect the tailrace training walls for spalling concrete, erosion, and misalignment at the construction joints and base.

Inspect the area downstream of the tailrace slab for erosion and undermining.

d. Upstream – Powerhouse intake. Inspect the trash rack screens for obstructions, deterioration, or missing bars.

Determine the extent of debris blocking the trash racks. Inspect the trash rack support beams for movement or deterioration.

Inspect the stoplog slots, top seals, and bottom seals for cavitation, spalling concrete, or obstructions. Inspect the float well intake for obstructions.

e. Upstream – Bulkhead. - Inspected the bulkhead seals and hull for damage.

Figure 1 – Aerial Image of Inspection Areas

Summary of Findings from ROV Report

a. Upstream – Spillway – Due to the clarity of the water, the sonar and the video were very clear on all of the tainter gates. Beside the typical rust and light debris, no other areas of concern were noted.

Most of the hitch blocks had the expected tuberculation on the mounting plates where the wire ropes are secured.

All sluice gates were clear of debris and major sediment. The concrete around the sluice gates were covered with light marine growth so inspection was more difficult. There were only a few instances of exposed aggregate around the edges of the concrete, especially on sluice gate 9.

b. Downstream – Stilling Basins – There was a large area of spalling of the stilling basin floor near the south wall. The area was approximately 75ft x 30ft wide and the depth of erosion was down to the top rebar layer. The drawing for the stilling basin did not show the depth of the first layer of rebar so no lineal depth could be established for the spalling.

The baffles showed minimal erosion with the worse sections on the south side of the basin. The corners of the baffles in this area were only slightly rounded with not exposed rebar found. There was light spalling at the construction joint in the center of the basin. There were some large rocks found between the baffles at the seventh baffle from the south wall. There was no damage noted along the end sill of the basin.

c. Powerhouse Tailrace – There was minimal sediment buildup along the northern tunnel. There were some spalling edges on the stoplog slots. All slots were clear of debris. The southern tailrace showed light spalling near the invert and continued to the crown. The north tailrace bifurcation was completely covered with marine growth and the concrete could not be examined with the video camera. There was some major spalling on the slab downstream of the tailrace along the south wall.

d. Upstream – Powerhouse Intake – The ROV survey began with this area so we could maintain the schedule for the power generation. There was debris covering the lower majority of the trash rack on the north side of the intakes. The south intake has some debris, but not near what the north intake had. All bars on the racks were intact. Figure 11 of the Hibbard Report (Appendix 1) shows ropes that were entangled in the south trash rack. No other problems were observed at the powerhouse intake.

e. Upstream – Bulkhead – The floating bulkhead was approximately ten feet off the bottom of the lake and was covered with heavy marine growth, but not major damage or anomalies were seen.

Areas of Concern The debris behind the trash racks of the powerhouse that should be considered for cleanout. The other area of concern is the spalling of the stilling basin in the area behind the baffles on the south side of the basin.

Bathymetric Survey of Keystone Dam

The bathymetric survey of upstream Keystone Dam was completed from the structure to 150 ft. upstream of the intake in all directions.

Tuck Mapping Team performed a Bathymetric survey of the stilling basin and 300 feet downstream of the end sill in the outlet channel using the Z-Boat due to the depth of water over the end sill and the baffles in the stilling basin. The rocks below the end sill also prevented us from completing the survey of this area with the larger bathy boat. Tuck Mapping used a combination of acoustic bathymetric and conventional survey methods to perform this work. For further details on the bathymetric survey, please see the

Bathymetric Report in the Appendix along with the external hard drive containing all data per SOW.

Upstream and Downstream Bathymetric Areas

a. Inspection Procedure. The boat was launched at a boat ramp located at the State Park marina and was ferried to the lock.

b. Upstream Mapping Results. The large Bathy boat was able to survey all the area above the dam.

The bathy survey included an area 150 feet behind the dam.

c. Downstream Mapping Results. The stilling basin’s baffles and end sill were located just under the water surface and therefore, these areas were surveyed with the Z-Boat. There is not apparent scouring or undercutting of the exit channel or the area below the end sill.

Personnel Conducting Inspection

Bobby Tuck Project Manager Tuck Mapping Solutions, Inc.

Michael “Buck” Poszywak ROV Pilot/Engineer Hibbard Inshore, LLC

Neil Beveridge ROV Tender Hibbard Inshore, LLC

David Saleh ROV Mechanic Hibbard Inshore, LLC

Jesse Price Bathy Manager ESP Associates, Inc.

Matthew Creighton Hydrographic Surveyor ESP Associates, Inc.

Richard Pinkham Hydrographic Surveyor ESP Associates, Inc.

Jacob Pinkham Boat Captain/Crane Operator ESP Associates, Inc.

Ethan Satcher Survey Technician ESP Associates, Inc.

Gavin Johnson Survey Technician ESP Associates, Inc.

Matt Reeds Park Ranger USACE

Point of Contact

Robert Tuck, PE, RLS, CP, PMP

Tuck Mapping Solutions, Inc.

President/Project Manager

276-523-4669 btuck@tuckmapping.com mailto:btuck@tuckmapping.com

Reviewed and Approved By:

Robert H. Tuck, PE, RLS, CP / President

Appendix I – Report of the ROV Survey

Equipment

The inspection was performed using a vLBV-300 MiniROV System (Figure 1). The vLBV-300 has a depth rating of 300-meters, 6 powerful brushless DC thrusters, 4-axis maneuverability, and a 270° range of view with a high intensity LED array tracking camera. The ROV was equipped with a Gemini 720is Forward

Scanning Multibeam Sonar, video camera systems, profiling sonar, and a 1,000-foot tether. The Gemini has an integrated sound velocity sensor that assists in providing high-resolution images with accurate ranging. Table 1 lists the specifications of the Gemini sonar system.

LBV-300 MiniROV and Gemini Tritech Sonar System

Table 1: Tritech 720is Multibeam Sonar System

Operating Frequency 720kHz Vertical Beam width 1° x 20°

Transducer Angle 10° downward tilt Optimum Range 2 –120 m (6.5-394ft.)

Swath 120° Update Rate Up to 97Hz

Number of Beams 768 Range Resolution 4mm and 8mm.

Inspection Notes Terminology and Definitions

The inspection notes used several terms to describe visual observations. The full list of inspection notes are in Pilot Notes

• Debris

Debris is any obvious abnormal protrusion from the invert of the tunnel. This is usually rock, concrete or sediment. All foreign pieces of anything will be considered debris, as well. In sewer tunnels, the debris can vary dramatically.

• Sediment

When the profiling multi-beam sonar showed an area where the vertical dimension of the tunnel decreased due to an even layer of collected foreign material on the invert, “sediment” was noted. Usually the sediment material is biological in nature, whether that be sand/dirt or marine growth collecting on the invert, though the actual material is difficult to determine based on sonar.

• CS

“CS” is short for “Cross section”. This note usually will include a numerical value after which is the footage into the tunnel the cross section is being taken at.

• Void

A void is a deviation in the wall of the tunnel away from centerline. Voids were primarily located using the forward-looking multi-beam imaging sonars and could have been in any orientation of the tunnel. If debris was in close proximity to a void, it was also included in the inspection notes.

• Feature

The term “Feature” is used throughout the inspection notes and this report as a way to note when there is an unforeseen abnormality or change seen in the tunnel. Sometimes these features are manmade and supposed to be there but should be examined further to determine if there are any abnormalities or damages in the areas.

• Crack

Cracks were called out if a linear object not parallel or perpendicular to the tunnel lay was seen on either the multi-beam sonar or visually on the video.

• Joint

Joints were seen very frequently throughout all tunnels. Most of the time, the joints were noted until they were determined to be overloading the notes. These are not anomalies, nor were they worth noting every time. However, it is very possible that some joints were mislabeled as cracks and some cracks were mislabeled as joints. Typically, the features would be called cracks if the line on the sonar or video was not obviously horizontal or perpendicular to the tunnel.

• Significant Features

Voids and debris on the invert were labeled as significant based on the intensity of the sonar return and the size of the accompanying shadow. Debris on the invert was significant if the item was more than 0.5 meters tall or there were many pieces of debris in close proximity. Sometimes the term “debris field” was substituted. Voids were labeled significant if the depth and size was more than 3 meters long and more than

2 meters deep into the wall. This determination was made based upon the forward looking imaging multi-beam sonars and the multi-beam profiling sonar.

• Miscellaneous Notes

Additional observations were input as necessary and are as descriptive as possible.

Keystone Dam Inspection

The upstream inspection of the powerhouse tailrace was from the bridge. The highway that runs across the top of the dam had high traffic the morning of the inspection. So, it was decided that the tainter gate inspection should be conducted from a vessel. The entire downstream inspection was conducted from the shore.

Figure 1 – Assumed numbering and naming convention of dam

North

South

Debris -North

Intake

Spalling

-Powerhouse

Tailraces

Feature-

End Sill

Spalling form lines

-End Sill

Exposed rebar

-Stilling Basin

Large rock debris

-Stilling Basin

Light erosion -Stilling Basin

The major anomalies of the inspection are outlined on this drawing with their respective location within this report.

Keystone Upstream

To begin the upstream inspection, the ROV was deployed from the bridge above the powerhouse intakes.

The ROV then inspected all trash racks and area around the trash racks. Next, the ROV inspected the first two tainter gates and first sluice gate. Once this area was complete, the ROV was deployed downstream to inspect the stilling basin. The next day, the ROV was deployed from a boat to inspect the tainter gates.

North intake

The upstream inspection began at the powerhouse intake trash racks. Debris was seen covering the lower majority of the leftmost trash rack (looking upstream). No broken bars or signs of damage were seen on any of the trash racks. The trash racks were covered in marine growth and had some tuberculation present on the vertical bars. All guide slots appeared intact without any major anomalies.

Figure 4 - Heavy amounts of debris

Figure 2 - Tuberculation on bars Figure 3 - Trash rack secured in guide slot

Figure 5 - Debris penetrating into penstock

Figure 6 - Debris in front of trash rack

Figure 7 - Debris pile north of intake and large debris stemming from trash rack

Figure 8 - All bars intact without any voids on trash rack

South Intake

The south intake had less debris than the north, but there was still some debris present on the trash rack. All vertical bars were intact and without any obvious damages. Light tuberculation was found on these bars as well. The guide slots were clear and without any anomalies.

Figure 10 - Ropes entangled in trash rack Figure 9 - Vertical bars intact, light debris on trash rack

Figure 11 & 12 - Rust blistering on top edge of trash rack

Tainter Gate

All 18 tainter gates were inspected visually with the sonar and video. The clear visibility allowed for a more detailed inspection of the wire ropes and hitch blocks. No major anomalies aside from typical rust blistering and light debris was found. Though, some wire ropes were covered in an unknown material, as shown in the following images. The majority of the hitch blocks showed heavy tuberculation on the mounting plates which the wire ropes are secured to.

All screenshots of every tainter gate’s hitch blocks and wire ropes are included on the external hard drive.

Below are just a few examples of what was seen during the inspection and were commonly found throughout all gates.

Figure 15 & 16 - Tainter gate 1 hitch blocks, left is rusting, right covered in debris

Figure 13 & 14 - Tainter gate 1 wire ropes, right covered in unknown material

Figure 17 - Leading edge of tainter gate 1 weir did not show any signs of erosion or undercutting

Figure 18 – Tainter gate 1 Weir was clear of debris and sediment, light spalling on center form line

Sluice Gates

All sluice gates were clear of debris and major sediment. The concrete around the sluice entrances were lightly covered in marine growth and sediment so inspecting the concrete was difficult. There were very few instances of exposed aggregate around the edges.

Figure 19 & 20 - Concrete around sluice gates covered in sediment and marine growth, some exposed aggregate was seen around sluice gate 9

Figure 21 - Sluice gate tunnel clear of debris and major sediment

Bulkhead

The floating bulkhead was inspected from the boat. Heavy marine growth covered the entire submerged portion of the bulkhead. No major damages or anomalies were seen and at this water elevation, the bulkhead was approximately 10ft off bottom.

Figure 232 & 3 – Marine growth covering surface

Figure 244 & 255 – Bottom of bulkhead

Downstream

Downstream The stilling basin and tailraces were inspected primarily with the multibeam sonar. No major anomalies were found in the tailraces. Light spalling was seen on the stoplog slots. Spalling was found on the concrete just downstream of the tailraces. Minor sediment and debris were seen in the north tailrace, the south tailrace was clean without any noticeable sediment or debris. The majority of the stilling basin was in good condition;

however, there was a large area of exposed rebar on the stilling basin floor. No spalling or exposed rebar was seen on any of the baffles. Minimal sediment and debris were found in the stilling basin as well.

Powerhouse Tailraces

Each tailrace was split into two tunnels which released into the river. The northern tailrace had some sediment buildup along the northern tunnel. Spalling edges were seen on the edges of the stoplog slots. The center steel guide in all slots were intact without any damages. All slots were clear of debris.

Figure 26 - Sonar of entire side of bulkhead, all vertical timbers intact in this area

Figure 26 & 27 - Spalling on concrete around stoplog guide slot

Figure 30 - Stoplog seal, light sediment on seal face

Figure 31 - South tunnel of south tailrace, clear of sediment and debris

Figure 32 - North tunnel of south tailrace, clear of sediment and debris

Sediment

Seal

Figure 33 - South tunnel of north tailrace, sediment and debris lined on training wall

Figure 34 - Sediment built up in tailrace

Figure 35 - Sediment in north tunnel of north tailrace

Sediment

Figure 36 - Sediment in north tunnel of north tailrace

Both drains were inspected for blockages and broken bars. Neither drain had either of these anomalies meaning they appeared to be in good condition.

Figure 39 – Drain in south tailrace

Figure 37 - South drain Figure 38 - North Drain

The south tailrace bifurcation showed light spalling near the invert and continued to the crown. The north tailrace bifurcation was completely covered in marine growth so the concrete could not be examined with the video camera.

Some major spalling was found on the slab downstream of the tailrace along the south wall. The concrete just downstream of the tailraces was in good condition without any spalling or anomalies.

Figure 42 - Large spalled edge of concrete slab along bedrock

Figure 40 - South bifurcation Figure 41 - North bifurcation

Spalling edge

Stilling Basin

The majority of the stilling basin appeared to be in good condition. However, there was a large area of spalling concrete on the floor of the stilling basin near the south wall. Rebar was exposed in approximately a 75ft x 30ft area with the depth of the erosion down to the top rebar layer.

Figure 43 - Exposed rebar in the stilling basin

Figure 44 - Exposed rebar in stilling basin

Figure 45 - Exposed rebar in stilling basin

The baffles showed minimal erosion with the worse sections on the south side. Corners of the baffles were only slightly rounded with no exposed rebar found.

Figure 48 - Lightly eroded baffle upstream edge, 3rd baffle from south wall

Figure 49 - Rounded baffle corner indicating light erosion

Figure 46 & 47 - Exposed rebar on floor of stilling basin

Rebar Rebar

Figure 50 - Typical construction joint outside of the exposed rebar area

Figure 51 - Light spalling on construction joint near center of basin

Figure 52 - No debris or sediment in center of basin, light spalling on form line

Spalling Form line

Spalling Form line

Minimal debris was found in the stilling basin. Approximately 7 baffles north from the south wall, large rock debris was found between the two rows of baffles. It is unclear where these large rocks came from.

Figure 53 - Rock debris between rows of baffles

Figure 54 & 55 - Rock debris between two rows of baffles

Aside from the large rocks previously shown, only small debris was found in the rest of the basin.

Figure 56 - Small debris and lightly spalling form line near north side of basin

End sill

No major anomalies or damages were found on the end sill of the stilling basin. The upstream edge appeared to hold a straight, non-eroded edge all the way across. The downstream edge joined with the bedrock and there did not appear to be any issues there. All form lines seen were not spalling majorly either.

Figure 57 - Form line on end sill

Spalling Formline Debris

Upstream Downstream

Figure 58 - End sill with downstream bed rock appearing higher than end sill

The concrete slab along the north wall showed an abnormal feature spanning across along with minimal spalling.

Figure 59 - Feature on slab along north wall of stilling basin

Sonar Plot Interpretation – Tritech Micron

The sonar heads used were two Micron sonar heads. One sonar head was a profiling head used to take cross sections. The other sonar was a sector head used for navigation as well as taking measurements and detecting features.

The sonar plots were recorded as snapshots. The display represents a vertical cross section at the back of the ROV. Up on the page is up and the right side is to the right of the ROV. There is a scale shown on the sonar image that shows the number of feet each range ring is for the ROV. Also, relative, and absolute range information between two cursor-selected points is listed on the lower left part of the display. A vertical color bar on the right side shows the range of colors used to display the intensity of the returning sound wave. Red indicates the strongest return, yellow is moderate, and black indicates no return.

Sonar contains two common events that make interpreting the display more complicated. The first event is an echo. The sound wave can bounce off multiple surfaces before returning, thus creating mirror images of features. This creates the illusion that there are more structures underwater than exist. These artifacts are easily distinguished and, in many cases, reveal additional information during analysis. One of the most

Upstream Downstream

Stilling basin Tailrace

Feature common echoes is off a water to air interface such as an air bubble in a culvert or the free surface in a shaft.

Shadows are the second event. The sound wave from the sonar head cannot see the backside of an object or around corners. These are the two most common events on a sonar plot that make the interpretation more complicated.

Figure 60 - Example Micron Sonar Image

ROV Specifications vLBV-300 MiniROV System

Little Benthic Vehicle

The compact size and increased depth capability of the vLBV300 make it an ideal rapid response, deep-water system. Four powerful forward thrusters and small diameter tether ensure true deep-water capability.

General

Depth Rating: 300m (1,000ft)

Length: 5625mm (24.6in)

Width: 390mm (15.4in)

Height: 390mm (15.4in)

Diagonal: 551mm (21.7in)

Weight in air: 18.1kg (39.9lbs)

Configuration: 4 forward vectored, 2 vertical

Motor Type: Brushless DC direct drive

Bollard Thrust: 18.1-22.5kgf (40-50 ft. /lbs.)

Speed at Surface: 3.5 knots (1.54 m/sec)

Max Operating Current: 2.5 knots (1.03m/sec)

South Wall

North Wall

Downstream

Echo

ROV

Echo

Invert

North Wall

South

Wall

ROV

Crown

UP

Sector Profile

Tether/Reel

Diameter: 8mm (0.3in) nominal

Length: 1,000m (3,280ft) standard

Buoyancy: Neutral in seawater

Cameras/Lighting

Range of View: 180 Degrees

Focus: Manual (90mm to infinity)

Format: NTSC or PAL

Cameras: 650 line High resolution color

Transmission Type: Fiber optic

Lighting: Internal 1080 Lumen LED tracks color camera and additional internal 1080 Lumen LED tracks monochrome camera

Control System

Configuration: Rugged case with weatherproof monitor and removable operator control unit

Monitor: 38cm (15”) LCD

Power Requirement: 3,000 watts, 100-240 VAC

Safety: Isolated input, circuit breaker, LIM, leak monitor Meets & exceeds ‘Code of Practice for the Safe use of Electricity in Water”

Auto Functions: Depth, heading, trim

Video Overlay: Depth, heading, lights, thruster gain, turns counter, camera angle, time, date, and user programmable characters

Additional Standard Equipment

Grabber: Manipulator with multiple jaw options

Sonar: Scanning, profiler

Console: Integrated Navigation and Control Console

Lights: 2 head ultra-bright LED

VisualSoft DVR System The video, sonar and written notes would be recorded with a computer such that all components of the inspection are synchronized. This simplifies reviewing the data after the inspection. The picture below shows the computer screen with two video channels, two sonar systems and written notes. By selecting a note in the list, all of the video and sonar channels are played from that location. This makes reviewing important features much faster without having to search through many disks or tapes. The data is supplied on a portable hard drive that plugs into a USB port on a PC computer. The portable drive includes viewing software.

Figure 61 - VisualSoft Layout

The middle panes are the videos. If one of the videos is not showing ensure that the “QuadDVR_Ch1”, “QuadDVR_Ch2”, “QuadDVR_Ch3”, and “QuadDVR_Ch4 icons are selected in the top left pane of the layout tab. If you double click on any of the videos it will pull that video out as a separate window. Double clicking it again will return the video to its original spot.

To the left of the video panes is the “Project Tree” tab which allows for the selection of different projects or portions of projects. Note the “Projects” tab must be selected. Individual features can be selected in the lowest pane. The features are in chronological order by time that is overlaid on the video. Selecting a feature will jump the video to that feature.

When the mouse is hovering in front of any of the videos there are VCR-like controls visible that allow playing/pausing video, fast forward, rewind, frame forward, frame back, and play from start. The play from start button only plays from the start of the current 15-minute video section. All of the videos are linked, so selecting the controls on one video controls all the videos. The exception to this is the full screen button which will only expand the selected video to full screen

Figure 62- VisualSoft Layout showing Video Controls

The blue and green bar above the videos displays the progress through the 15-minute section of video and pressing on any portion of the bar will jump to that location in the videos. The time shown next to the bar is the local time in 12-hour format for that place in the video.

Using the Data Reviewing Program: VisualReview.exe

Hard Drive Contents

All of the Data was delivered on a USB external hard drive. The drive also contains a program to view the data. Connect the drive to a Windows computer with the USB cable. Windows will recognize the external hard drive.

The drive contains the following file structure:

<Drive letter>:\Viewer Viewer to playback DVR video

<Drive letter>:\VisualWorks Project data for DVR viewer

<Drive letter>:\200700 Tuck Mapping All individual dam sonar data

The folder titled “Viewer” contains the program to view the data from the inspection. The “VisualWorks” folder contains all of the data for the VisualReview program.

Opening the Viewer Program

To open the “Viewer” program for the first time, you should open the folder “Viewer” and select

“VisualReview Launcher” to start the application. This application will scan your computer to ensure all the required programs are on your computer and will allow you to download and install any missing prerequisites. Once this is done, you can simply open the folder “Viewer” and select “VisualReview” to start the program. Alternatively, you can copy the folder “Viewer” to the host computer and run the program. The program will run faster if run from the host computers local drive. A Windows XP or

Windows 7 computer should be used. Once the program is opened, locate, and load the data files. The drop-down window as shown in figures 8 and 9 should be used to locate the folder with the data files. Then the list of data sets will be visible, select as many data sets as desired to review.

Loading Data into Visual Review

Figure 63 - VisualReview Load screen

Select the

516704A_Two_Rivers

VisualWorks folder

Browse for the project folder

Figure 64 - Close up of Folder Selection

When the Data is loaded, there will be a list of data files in the window labeled “Projects”. If the “Projects” box is not visible, go to the top pane and select “Projects”. Select the check box to activate the data files.

If the videos are not showing select “DualDVR_Ch1” and “DualDVR_Ch2” buttons in the top pane. The menu items that should be checked in the top pane are: “DualDVR_Ch1”, “DualDVR_Ch2”, “DualDVR_Ch3”, “DualDVR_Ch4”, “Projects”, “Survey Data”, and “Time Display”. For the Dry section, Camera 1 has the video while the other 3 channels were not used. For the Flooded section, Camera 3 has the sonar data and camera 4 has the video. At any time, a note can be double clicked in the “DVR Log” tab and all of the data will start to play from that location. The data can be paused, fast forwarded, etc. with the VCR style controls displayed over the videos. The notes contain the umbilical payout, observations and

ROV location. The umbilical payout is shown on all the camera overlays in feet. Depth is the water depth of the ROV in feet. The figure below shows the way that the data viewing program should look when reviewing data.

By right clicking on a video channel image, a still image can be grabbed, or a video clip can be created for exporting to reports, etc. The notes were already exported to MS Excel as this functionality is not available in this free viewer. These notes are included with the rest of the data on the drive in the “Work” folder.

Review Data

Figure 65 - Review Data

Cable Payout

“Camera” 1

Notes

“Camera” 4 Data File List

Pilot Notes

Upstream Powerhouse

Date Time Comment

26/07/2020 7:45:15 lots of debris on trash rack

26/07/2020 7:46:05 debris

26/07/2020 7:47:16 trash rack

26/07/2020 7:47:20 upper left

26/07/2020 7:47:37 debris on top

26/07/2020 7:48:31 lifting point

26/07/2020 7:48:41 upper right

26/07/2020 7:48:50 debris inside

26/07/2020 7:50:05 following left guide up

26/07/2020 7:52:27 right guide slot

26/07/2020 7:54:19 moving to second set of trash racks

26/07/2020 7:59:37 at the right intake

26/07/2020 8:00:06 upper left

26/07/2020 8:00:45 center

26/07/2020 8:00:52 right trash rack of right side

26/07/2020 8:01:14 rust blister

26/07/2020 8:01:29 going to surface

26/07/2020 8:02:29 left guide slot

26/07/2020 8:04:57 rope in water

26/07/2020 8:05:27 going up on right guide slot

Tainter Gates

26/07/2020 8:20:19 tainter gate 1

26/07/2020 8:20:27 diving down

26/07/2020 8:22:07 area is clear of debris

26/07/2020 8:22:15 to sluice 1

26/07/2020 8:22:48 entering sluice 1

26/07/2020 8:24:10 concrete around sluice gate

26/07/2020 8:25:39 going to right side of sluice gate

26/07/2020 8:27:43 tainter gate 1

26/07/2020 8:28:42 wire rope

26/07/2020 8:28:47 hitch block

26/07/2020 8:29:35 previous wire rope and hitch was left side

26/07/2020 8:29:52 going to right side wire rope

26/07/2020 8:30:02 right side hitch block

26/07/2020 8:30:17 debris

26/07/2020 8:30:33 coming up on wire ropes

26/07/2020 8:30:56 at surface

26/07/2020 8:31:00 going to gate 2

26/07/2020 8:32:14 on left side wire rope

26/07/2020 8:32:30 at left side wire rope

26/07/2020 8:32:53 left side hitch block

26/07/2020 8:33:08 debris

26/07/2020 8:34:01 right side hitch block

26/07/2020 8:34:50 right wire rope

27/07/2020 11:24:06 entering tainter gate 18

27/07/2020 11:24:36 wire rope right side

27/07/2020 11:24:55 debris

27/07/2020 11:25:04 hitch block right side

27/07/2020 11:25:22 going to left side wire rope tainter 18

27/07/2020 11:25:54 left side hitch block

27/07/2020 11:26:28 left side wire rope

27/07/2020 11:29:01 sluice number 9

27/07/2020 11:29:23 going into sluice nine

27/07/2020 11:30:09 concrete around sluice

27/07/2020 11:30:46 exposed aggregate

27/07/2020 11:31:15 light spalling

27/07/2020 11:33:30 entering tainter 17

27/07/2020 11:34:00 wire rope right side

27/07/2020 11:34:28 right side hitch block

27/07/2020 11:35:29 hitch block left side

27/07/2020 11:35:56 wire rope left side

27/07/2020 11:37:35 tainter gate 16

27/07/2020 11:38:09 right side wire rope

27/07/2020 11:38:29 right side hitch block

27/07/2020 11:39:38 left side hitch block

27/07/2020 11:39:59 left side wire rope

27/07/2020 11:42:25 sluice gate 8

27/07/2020 11:43:19 concrete around sluice gate

27/07/2020 11:47:44 tainter gate 15

27/07/2020 11:48:18 hitch block right side

27/07/2020 11:48:29 wire rope right side

27/07/2020 11:49:29 hitch block left side

27/07/2020 11:49:49 wire rope left side

27/07/2020 11:54:16 tainter gate 14

27/07/2020 11:54:27 right side wire rope

27/07/2020 11:54:49 right side hitch block

27/07/2020 11:55:57 left side hitch block

27/07/2020 11:56:24 debris

27/07/2020 11:56:36 left side wire rope

27/07/2020 11:57:49 diving to sluice gate

27/07/2020 11:59:09 entering sluice gate 7

27/07/2020 12:00:17 concrete around sluice

27/07/2020 12:03:15 entering tainter 13

27/07/2020 12:03:52 wire rope right side

27/07/2020 12:04:11 hitch block right side

27/07/2020 12:04:28 rust blistering

27/07/2020 12:05:17 hitch block left side

27/07/2020 12:05:41 wire rope left side

27/07/2020 12:07:32 entering tainter gate 12

27/07/2020 12:08:00 wire rope right side

27/07/2020 12:08:18 hitch block right side

27/07/2020 12:09:36 hitch block left side

27/07/2020 12:09:45 debris

27/07/2020 12:10:13 cotter pin

27/07/2020 12:11:13 wire rope left side

27/07/2020 12:14:17 sluice gate 6

27/07/2020 12:16:53 concrete around 6

27/07/2020 12:22:38 moving boat

27/07/2020 12:27:20 going to tainter gate 11

27/07/2020 12:28:39 entering tainter gate 11

27/07/2020 12:29:17 right side wire rope

27/07/2020 12:29:36 debris

27/07/2020 12:29:40 right side hitch block

27/07/2020 12:32:37 anode

27/07/2020 12:32:59 left side hitch block

27/07/2020 12:33:06 debris in hitch block

27/07/2020 12:34:49 entering tainter gate 10

27/07/2020 12:35:44 right side wire rope

27/07/2020 12:36:03 debris

27/07/2020 12:36:09 hitch block right side

27/07/2020 12:37:06 wire rope left side

27/07/2020 12:37:13 hitch block

27/07/2020 12:39:22 sluice number 5

27/07/2020 12:41:09 concrete around sluice

27/07/2020 12:43:25 entering tainter gate 9

27/07/2020 12:44:09 right side wire rope

27/07/2020 12:44:34 right side hitch block

27/07/2020 12:45:32 hitch block left side

27/07/2020 12:45:58 wire rope left side

27/07/2020 12:47:16 entering tainter gate 8

27/07/2020 12:48:20 right side hitch block

27/07/2020 12:48:29 right wire rope

27/07/2020 12:49:08 left side wire rope

27/07/2020 12:49:26 left side hitch block

27/07/2020 12:51:44 sluice 4

27/07/2020 12:52:58 concrete around sluice

27/07/2020 12:55:30 entering tainter gate 7

27/07/2020 12:55:51 right side wire rope

27/07/2020 12:56:09 right side hitch block

27/07/2020 12:57:03 left side hitch block

27/07/2020 12:57:24 wire rope

27/07/2020 12:58:25 entering tainter gate 6

27/07/2020 12:58:56 right side wire rope

27/07/2020 12:59:09 right side hitch block

27/07/2020 12:59:39 anode

27/07/2020 12:59:50 debris

27/07/2020 13:00:39 left side hitch block

27/07/2020 13:01:03 wire rope

27/07/2020 13:05:08 sluice 3

27/07/2020 13:06:12 concrete around sluice

27/07/2020 13:08:33 entering tainter gate 5

27/07/2020 13:08:57 wire rope right side

27/07/2020 13:09:09 hitch block right side

27/07/2020 13:10:13 hitch block left side

27/07/2020 13:10:35 wire rope left side

27/07/2020 13:11:49 entering tainter gate 4

27/07/2020 13:12:24 wire rope right side

27/07/2020 13:12:42 debris

27/07/2020 13:12:47 hitch block right side

27/07/2020 13:14:04 debris and hitch block

27/07/2020 13:20:09 sluice 2

27/07/2020 13:20:55 concrete

27/07/2020 13:23:12 entering tainter gate 3

27/07/2020 13:23:43 right side wire rope

27/07/2020 13:23:52 right side hitch block

27/07/2020 13:24:46 hitch block left side

Stilling basin

26/07/2020 9:39:08 debris

26/07/2020 9:42:50 spalling

26/07/2020 9:43:06 exposed rebar

26/07/2020 9:46:34 first baffle

26/07/2020 9:46:51 light erosion

26/07/2020 9:52:27 5

26/07/2020 9:55:25 10

26/07/2020 9:59:03 20

26/07/2020 9:59:37 spalling

26/07/2020 10:00:33 no erosion

26/07/2020 10:04:42 30

26/07/2020 10:10:38 Continue inspection

26/07/2020 10:11:49 35

26/07/2020 10:12:59 spalling

26/07/2020 10:13:54 40

26/07/2020 10:17:26 45

26/07/2020 10:19:58 42 m from the end

26/07/2020 10:20:16 8 left

26/07/2020 10:35:14 at beginning

26/07/2020 10:39:14 start the back of the upstream Row

26/07/2020 10:39:35 debris

26/07/2020 10:40:50 5

26/07/2020 10:41:58 rock debris

26/07/2020 10:44:27 10

26/07/2020 10:46:59 15

26/07/2020 10:49:04 20

26/07/2020 10:53:18 small void

26/07/2020 10:54:44 30

26/07/2020 10:57:43 40

26/07/2020 10:59:44 45

26/07/2020 11:00:58 6 left

26/07/2020 11:01:14 33 m to the end

26/07/2020 11:17:05 start the inspection of the downstream row

26/07/2020 11:18:23 5

26/07/2020 11:19:38 10

26/07/2020 11:21:20 15

26/07/2020 11:23:00 20

26/07/2020 11:24:46 25

26/07/2020 11:40:46 start of end sill inspection

26/07/2020 11:51:58 at end

27/07/2020 7:48:27 large rock

27/07/2020 7:52:46 entering stilling basin

27/07/2020 7:55:44 beginning baffle inspection

27/07/2020 7:58:07 number 5 from end

27/07/2020 8:01:13 finish upstream baffle row

27/07/2020 8:02:38 sediment

27/07/2020 8:05:54 beginning downstream row inspection

27/07/2020 8:10:32 stilling basin complete

Tailrace

27/07/2020 8:16:05 spalling concrete

27/07/2020 8:16:32 following left side guide slot number 4

27/07/2020 8:19:50 light spalling

27/07/2020 8:20:32 entering number 4 tail race

27/07/2020 8:23:13 bifurcation

27/07/2020 8:27:04 guide slot number 4 right side

27/07/2020 8:27:16 spalling concrete

27/07/2020 8:31:19 number 3 left side guide slot

27/07/2020 8:32:42 marine growth

27/07/2020 8:40:34 computer crashed

27/07/2020 8:40:39 still in third channel

27/07/2020 8:40:52 at drain

27/07/2020 8:42:35 number three right guide

27/07/2020 8:46:13 number two left guide slot

27/07/2020 8:47:27 marine growth

27/07/2020 8:48:40 entering penstock

27/07/2020 8:48:46 debris

27/07/2020 8:49:46 drain

27/07/2020 8:50:39 bifurcation

27/07/2020 8:51:04 covered in marine growth

27/07/2020 8:56:37 number 1 left side

27/07/2020 8:59:09 entering number 1

27/07/2020 8:59:44 light sediment

27/07/2020 9:00:12 going up right guide slot

27/07/2020 9:03:48 inspecting floor downstream of tail race

27/07/2020 9:06:00 inspection complete

Bulkhead

27/07/2020 13:35:08 left seal front face

27/07/2020 13:36:20 at bottom

27/07/2020 13:46:29 back side seal

Appendix II – Report from Bathymetric Survey

KEYSTONE LAKE

HYDROGRAPHIC SURVEY

TULSA COUNTY, OKLAHOMA

For the

U.S. ARMY CORPS OF ENGINEERS TULSA DISTRICT

DATE OF DATA COLLECTION

STILLING BASIN SIDE August 23, 2020 and RESERVOIR SIDE August 22, 2020

Figure 66: Sample Keystone Scan

Field Survey Equipment

Field surveys of the DS section of the Keystone Lake Dam was conducted on August 23, 2020 with the DS hydrographic data being collected with an Oceanscience Z-Boat ROV equipped with a Teledyne Odom

MB2 multibeam sonar. Field surveys of the US section of the Keystone Lake Dam were collected on

August 22, 2020 with Survey Vessel (SV) “Eridanus” a 20 ft “Scully’s” commercial aluminum vessel equipped with an Edgetech 6205 dual frequency Interferometric Swath multibeam sonar and an Applanix

Ocean Master MV-320 GPS and inertial measurement unit (IMU). Specifications for both systems are listed below. Terrestrial (above water surface) scans of the dam and stilling basin were collected using a Trimble

SX-10 and Trimble TSC7 data collector. The terrestrial scans collected were used to provide quality control data to verify 3d alignment of our hydrographic survey data with the stilling basin and dam superstructure.

Trimble R-10 Model 2 GPS receivers with TSC7 data collectors were used to very horizontal and vertical control provided by the USACE and as RTK base stations providing corrections to SV “Eridanus” and the

Z-Boat ROV.

Survey Vessel “Eridanus”

Hydrographic/Bathymetric Equipment

Scully 20’ Aluminum Enclosed Hydro Boat with

Twin Honda 90hp 4 Stroke Engines

Edgetech 6205 Swath Bathymetry and Side

Scan Sonar (550/1600 kHz)

Edgetech 6205 Rack Mount Topside Sonar

Interface Discover Swath Bathymetry & Side Scan Acquisition Software

Applanix RTK POS MV 320

RTK POS MV 320 EPOS MV Computer System

Rackmount Computer - 19” 4U chassis

Stealth LPC-700F Mini High-Performance Rack

Mount Computer with 4 Monitors

Valeport MiniSVP Profiler and Software

Odom Digibar Pro Velocimeter

Odom ECHOTRAC CV Dual Freq. Echo

Sounder

Odom OTSBB200/24-4/20 Dual Freq.

Transducer (200/24 kHz)

Seafloor HydroLite-TM Single Beam Echo

Sounder

HYPACK MAX including HYSWEEP

Hydrographic

Surveying Software

HYPACK SURVEY MODULE

Raymarine C120 Chartplotter w/US Coastal

Navionics Gold Charts

Raymarine Depth Sounder and Radar

Figure 67 - Eridanus

Figure 68 - Equipment inside of Eridanus

TELEDYNE OCEANSCIENCE Z-BOAT 1800-RP

Z-Boat Specifications:

Length: 1.8 m Width: 1m

Height: 1.1 m

Weight w/Payload: 68 kg +

Propulsion: Dual brushless 24V DC outdrives

Navigation remote & frequency: Hitec with Vessel Telemetry / 2.4 GHz

FHSS

Navigation remote range: 1200 m

Data telemetry range – 5 GHz MIMO:

Up to 2 km

Typical survey speed: 3 – 3.5 knots

Top speed: 8 knots

Battery endurance: Up to 4.5 hours

Battery type: NiMH or Li-ion

Teledyne Odom Hydrographic MB2 Multi-beam Echosounder Frequency: 200 – 460 kHz

Swath Width: 10 – 140 degrees

Acoustic Bean Width: 1.8 deg. x 1.8 deg. across track

Number of Beams: 10 – 256

Applanix POS MV Wavemaster

Integrated real-time SVP sensor

Primary Control

The USACE provided the site primary horizontal and vertical control (see below). Additional temporary secondary control points were established for the collection of terrestrial scan data collection.

The above control data is shown in the order, from left to right, as Dam Site Name, Monument Name, Northing, Easting, and Elevation. The coordinates and elevations shown are in the NAD 83 Oklahoma

State Plane (North Zone) and NAVD 88 (Geoid 12B) datum respectively and are in International Feet.

Data Collection

Multibeam data collection for the upstream section was collected using SV “Eridanus” and the downstream section of the dam was collected using the Z-Boat ROV. Sound velocity profiles were collected utilizing an Odom Digibar Sound Velocity Profiler. RTK corrections were transmitted to SV “Eridanus” and the Z-

Boat using a Trimble R-10 Model 2 GPS Receiver/Base station.

Terrestrial Scan data on both sides of the dam and stilling basin were collected. These data were collected with a Trimble SX-10 Robotic total station and TSC7 data collector.

Keystone KS1 424,019.14 2,484,673.74 771.69 SPC 3501 OK N NAVD 88 12B NAD 83

Figure 69 - Zboat as specified

Processing/Mapping The hydrographic multibeam data was processed utilizing Hypack / HySweep processing / analysis software. HySweep was utilized to create a 2-foot matrix of the lakebed and a 1-foot matrix of the floor of the stilling basin. Further analysis of hydrographic data was performed utilizing the terrestrial scan data collected with the SX-10 scanner in Trimble Business Center Software, TerraModel and then exported to

MicroStation for the creation of the digital terrain model, contour, and cross sections. In addition to the traditional MicroStation drawings and PDF drawings we also provided in this submittal a point cloud data of the site in LAS format.

The hydrographic survey data and terrestrial scan data were compiled into one data set in *.LAS format in order to provide the Tulsa District with an alternative comprehensive survey grade 3D point cloud dataset which can be utilized in many different software’s.

Various rendering was compiled utilizing the combined terrestrial and hydrographic data and are provided below.

Data Accuracy The submitted data meets or exceeds the following relative positional accuracies.

Horizontal Relative Positional Accuracy – Hydrographic Survey Data = RMSE 1.75 ft at 95%

Vertical Relative Positional Accuracy – Hydrographic Survey Data = RMSE 0.56 ft at 95%

Horizontal Relative Positional Accuracy – SX-10 Scan Data = RMSE 0.17 ft at 95%

Vertical Relative Positional Accuracy – SX-10 Scan Data = RMSE 0.20 ft at 95%

MicroStation Drawings and PDF Drawings Submitted via External Hard Drive

Drawing Examples

Figure 70 & 71 – Cover Sheet/Border Sheet

Drawing Examples (Continued)

Figure 72 - Cross Section

Site 3D Renderings

Figure 73 - Isometric View 1

The following bathymetric screenshots are terrestrial scans merged with the bathymetric scans to provides views of above water and below water. Please see the external hard drive delivered with this project for all

CAD/DGN files.

Figure 74 - Bathymetric Screenshots

Figure 75-77 -Bathymetric Screenshots

Figure 78 & 79 - Terrestrial/Bathymetric