Exhibit_A2.pdf

Report for:

State of Minnesota MCF Faribault Tunnel Study Update Project Number: 18-063.00

April 26, 2018

MCF Faribault Tunnel Study Update Karges-Faulconbridge, Inc. • KFI – 18-063.00 Faribault, MN Page 2 of 25

Building Site Info

Faribault Prison Tunnel Study

78FA0062 Update Outer Tunnel Study

KFI Project Manager Information

Elizabeth Nielsen, PE Karges-Faulconbridge, Inc.

670 County Road B West St. Paul, MN 55113-4527 ernielsen@kfi-eng.com 651-771-0880 - Office 651-771-0878 - Fax

Project Contacts

Marque Garczynski, Project Manager Real Estate and Construction Services Department of Administration-State of Minnesota 50 Sherburne Ave Rm 309 St Paul, MN 55155 mailto:ernielsen@kfi-eng.com

Table of Contents

Building Site Info

Table of Contents

Executive Summary

Introduction & Scope

Project Priority

Investigation Team

Tunnel Summaries and Recommendations

Construction Cost Summary

Faribault, MN Page 4 of 25

Executive Summary

This report is an update to the Utility Tunnel Restoration project dated July 16, 2001 for Tunnels AC, AD, AE, AF, AG, AI, AJ, AK, and Hillcrest. The previous report noted deficiencies with the root cause being water intrusion. Water continues to be a problem causing deterioration of the reinforcing steel leading to concrete spalling, delamination, and cracking. A summary of the total repair costs and upgrades is listed below.

Tunnel AC $109,600.00 Tunnel AD $536,500.00 Tunnel AE $214,000.00 Tunnel AF $417,500.00 Tunnel AG $47,200.00 Tunnel AI $443,600.00 Tunnel AJ $618,700.00 Tunnel AK $120,000.00 Hillcrest Tunnel $450,000.00 Tunnel Ventilation System $604,000.00 Electrical Upgrades $60,000.00 Total $3,621,100.00

Introduction & Scope

A report identifying site wide tunnel conditions and a restoration cost estimate was completed in July of 2001. KFI has been tasked with updating the study by summarizing current conditions and developing a new cost estimate specific to the nine (9) tunnels listed above. Some upgrades have been completed in the tunnels since the previous report, however little of it is structural. Concrete spalling and delamination caused by corrosion of the reinforcing steel remains evident in multiple locations, and several areas below parking lots and roadways have been shored due to structural concerns with current and planned above grade traffic loads.

Representatives from the State of Minnesota and the Faribault Correctional Facility escorted KFI through the tunnels making it possible to note the current condition. Based on the review, a summary of each tunnel’s current condition, necessary actions, and an estimate of costs to repair the identified issues was compiled.

The structural repairs and condition of the remaining tunnel sections will only remain structurally sound if water can be prevented from penetrating the walls and corroding the tunnel reinforcing steel.

Therefore we recommend applying an external waterproofing system to prevent further corrosion to structural, mechanical, and electrical systems. The extent of waterproofing will depend on further investigation to identify the water table elevation and how it relates to the tunnel elevations.

Previously recommended was an intake and exhaust system to control the relative humidity in the tunnel spaces. The system shall ventilate the tunnel system at a rate of five (5) air changes per hour

Faribault, MN Page 5 of 25 when relative humidity in the tunnels exceeded set point or when occupied. Ventilation in the summer months would be limited to periods when ambient relative humidity levels are below tunnel humidity levels. This report identifies areas where it is still necessary to install an effective mechanical ventilation system which would control tunnel humidity and promote the evaporation of any accumulating water, thereby extending the life of all tunnel systems subject to the effects of moisture.

Standing water was present in several tunnels at the time of the team walkthrough. We recommend installing new sumps, pumps and discharge piping, and repairing existing sumps, pumps and discharge piping in the areas with standing to provide automatic dewatering.

Tunnel areas undergoing extensive restoration will require that the mechanical and electrical utilities in the vicinity be removed or temporarily shored to facilitate structural work. Although this circumstance may represent an opportunity for redesign or other rework of these existing systems, costs associated with redesign are not included in this report.

Project Priority

A description of each priority level is listed below.

Priority 1 Those areas of the tunnels that have deteriorated to a point where safety is an issue, or where the tunnel structure is inadequate to support mechanical and electrical utilities or traffic and earth loads on the tunnel. Repair is recommended promptly after receiving funding.

Priority 2 Those areas of the tunnels that are deteriorating such as that they are projected to become a Priority 1 area within three (3) years. Repair is recommended within two (2) years.

Priority 3 Those areas of the tunnels exhibiting relatively minor structural deterioration or minor damage to mechanical and electrical utilities. Repair is recommended within five (5) years.

Investigation Team

The investigation team consists of professional engineers in the three engineering disciplines represented in the work. The study is led by Elizabeth Nielsen, P.E. who is also responsible for the electrical portion of the work. Matt Johnson, P.E., and Brady Wateland P.E. are responsible for the structural work, and Dan Sieben P.E. is responsible for the mechanical work. The observations and recommendations in this report are based upon the on-site inspections and evaluations of these individuals and by support staff as appropriate.

Matt Johnson, P.E. Structural Brady Wateland, P.E. Structural Dan Sieben, P.E. Mechanical Elizabeth Nielsen, P.E. Electrical

Faribault, MN Page 6 of 25

Tunnel Summaries and Recommendations

Tunnel AC – Length 115 ft

Priority 1

Deficiencies

Structural:

Corroded reinforcing and delaminated concrete at north 25 feet of tunnel lid.

Spalled concrete at tunnel lid joints.

Spalled concrete on tunnel walls.

Various minor horizontal and vertical cracks.

Mechanical:

Water pooled in tunnel did not allow access through tunnel.

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways

Install lighting to meet 1 footcandle average for emergency egress

Conduit deteriorating

Install cable tray

Recommended Actions:

Full replacement of tunnel lid at north end of tunnel (approx. 25 feet).

Repair concrete at spalled lid joints.

Repair cracks.

Waterproof tunnel.

Piping insulation is mostly intact; supports have corrosion. Replace supports.

Install sump and pump to control accumulation of water.

Ventilate tunnel to reduce humidity levels.

Conduit is still intact although supports have rusted through. Replace supports.

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Spalled concrete along tunnel walls.

Corroded reinforcing and delaminated concrete along the tunnel lid.

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Tunnel AD – Length 277 ft

Priority 1

Deficiencies

Structural:

East 100 feet of tunnel lid has corroded reinforcing and delaminated concrete.

Tunnel lid is shored below parking lot and access road.

Concrete spalling at horizontal construction joints in east 100 feet of tunnel.

Various minor horizontal and vertical cracks.

Mechanical:

Water pooled in tunnel at a plugged floor drain.

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install additional lighting to meet 1 footcandle average for emergency egress.

Install cable tray.

Cable terminations not enclosed.

Recommended Actions:

Replace tunnel lid along east 150 feet of tunnel.

Repair horizontal joints in east 100 feet of tunnel.

Repair cracks.

Waterproof tunnel.

Piping insulation is mostly intact; supports have corrosion. Replace supports.

Repair floor drain and drainage system or install sump and pump to control accumulation of water.

Conduit is still intact although supports have rusted through. Replace supports.

Faribault, MN Page 9 of 25

Shored tunnel lid underneath parking lot.

Corroded reinforcing and delaminated concrete in tunnel lid.

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Exposed terminations, cables not properly labeled and not run in raceway.

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Tunnel AE

Priority 3

Deficiencies

Structural:

Poorly consolidated concrete at base of wall.

Minor vertical cracks in walls.

Mechanical:

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install cable tray.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions:

Patch walls at areas of poorly consolidated concrete.

Repair vertical cracks.

Waterproof tunnel.

Faribault, MN Page 12 of 25

Poorly consolidated concrete at base of wall.

Cables should be identified and run in raceway.

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Tunnel AF – Length 180 ft

Priority 1

Deficiencies

Structural:

Corroded reinforcing and delaminated concrete from end of tunnel extending east 50 feet.

Several isolated areas of spalled and delaminated concrete in tunnel lid.

Various minor horizontal cracks.

Mechanical:

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install lighting to meet 1 footcandle average for emergency egress.

Install cable tray.

Recommended Actions:

Full replacement of tunnel lid from end of tunnel extending east 50 feet.

Repair of tunnel lid at isolated spalled and delaminated concrete.

Repair horizontal cracks in wall.

Waterproof tunnel.

Piping insulation is mostly intact; repair damaged areas.

Corroded reinforcing and delaminated concrete in tunnel lid.

Faribault, MN Page 14 of 25

Tunnel AG – Length 40 ft

Priority 3

Deficiencies

Structural:

Minor vertical cracks in tunnel walls.

Mechanical

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions:

Repair vertical cracks in tunnel walls.

Waterproof tunnel.

Minor vertical cracks in tunnel wall.

Faribault, MN Page 15 of 25

Tunnel AI – Length 360 feet

Priority 2

Deficiencies

Structural:

Several isolated areas of spalled and delaminated concrete in tunnel lid.

Significant concrete delamination and reinforcing corrosion at north end of tunnel.

Minor vertical cracks in tunnel walls.

Mechanical:

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions

Repair tunnel lid at isolated spalled and delaminated concrete.

Removal and replacement of concrete lid at north end of tunnel.

Repair vertical cracks in tunnel walls.

Waterproof tunnel.

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Isolated area of spalled and delaminated concrete in tunnel lid.

Significant concrete delamination and reinforcing corrosion at north end of tunnel.

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Tunnel AJ – Length 376 ft

Priority 1

Deficiencies

Structural:

Tunnel lid shored below parking lot and access road in multiple locations.

Several isolated areas of spalled and delaminated concrete in tunnel lid.

Horizontal cracks in tunnel walls.

Mechanical:

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install cable tray.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions:

Replace tunnel lid at shored locations.

Repair tunnel lid at isolated spalled and delaminated concrete.

Repair cracks in tunnel walls.

Waterproof tunnel.

Faribault, MN Page 18 of 25

Tunnel lid shoring below parking lot. Horizontal cracks can be seen at top of right wall.

Isolated areas of spalled and delaminated concrete in tunnel lid.

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Tunnel AK - Length 100 ft

Priority 3

Deficiencies

Structural:

Poorly consolidated concrete at base of wall.

Mechanical:

Water pooled in tunnel at a non-functioning sump pump.

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install cable tray.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions:

Patch wall at areas of poorly consolidated concrete.

Waterproof tunnel.

Piping insulation is mostly intact; repair damaged areas.

Repair sump pump discharge pipe and adjust float to automate dewatering.

Poorly consolidated concrete at base of wall. Pooling water in tunnel floor.

Faribault, MN Page 20 of 25

Hillcrest Tunnel– Length 180 ft

Priority 1

Deficiencies

Structural:

Concrete lid delamination in sections below Power Plant building.

Corroded reinforcing and concrete delamination at tunnel lid throughout remaining length of tunnel.

Tunnel is shored.

Small offshoot tunnel to well house is in poor condition.

Tunnel walls and lid in very poor condition at end of tunnel beyond water main.

Spalling of concrete walls (no visible reinforcing).

Mechanical:

Steam trap was leaking creating high humidity level.

High humidity of tunnel air deteriorating pipe and conduit supports.

Electrical:

Identify raceways.

Install cable tray.

Install lighting to meet 1 footcandle average for emergency egress.

Recommended Actions:

Repair delaminated concrete below Power Plant.

Full replacement of tunnel lid outside of Power Plant.

Replace tunnel lid at offshoot tunnel to well house.

Patch spalled concrete as required.

Close off tunnel beyond water main. Infill tunnel with soil or concrete.

Waterproof Tunnel.

Repair steam traps.

Faribault, MN Page 21 of 25

Concrete lid delamination below Power Plant building.

Corroded reinforcing and concrete delamination at tunnel lid and shoring located below parking lot.

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Spalling of concrete wall.

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Construction Cost Summary

The construction cost estimates are for budgetary purposes, and are predicated upon the following:

Included in the cost estimates:

1. General structural, mechanical, and electrical construction contract amounts.

2. Construction contingency.

3. Design contract services.

Not included in the cost estimates:

1. Work associated with low voltage data or communications systems in the affected tunnel areas including removal, replacement, temporary connections, or other work, even when such work may be required to facilitate other work that is within the present scope.

2. Redesign or other rework of mechanical or electrical systems removed solely to facilitate structural restoration in the tunnels.

3. Costs incurred by the facility to coordinate or accommodate utility or other service or system interruptions.

4. Administrative or project management costs by the State.

Assumptions applicable to cost estimates:

1. No asbestos or other hazardous materials requiring special handling are located within the project site.

2. Facility will remove all non-essential tunnel security doors and install louvers in remaining tunnel security barriers to promote ventilation.

3. The tunnel ventilation system is an integrated whole, and as such will be installed throughout the tunnel system as part of the work.

4. Existing tunnel piping can be shored as required during tunnel repairs. Piping and other utilities will not need to be temporarily rerouted to accommodate construction.

5. All tunnel waterproofing will extend over the top of the tunnel and down the full height of each tunnel side.

6. Adequate MCF-Faribault staff and other resources will be available to escort construction personnel as necessary, and otherwise facilitate the construction process.

Faribault, MN Page 24 of 25

Tunnel Structural Repairs and Waterproofing

The costs outlined below are those to repair the structural deficiencies outlined in each tunnel summary as well as providing waterproofing across the top and sides of the tunnels.

Tunnel AC $109,600.00 (Priority 1) Tunnel AD $536,500.00 (Priority 1) Tunnel AE $214,000.00 (Priority 3) Tunnel AF $417,500.00 (Priority 1) Tunnel AG $47,200.00 (Priority 3) Tunnel AI $443,600.00 (Priority 2) Tunnel AJ $618,700.00 (Priority 1) Tunnel AK $120,000.00 (Priority 3) Hillcrest Tunnel $450,000.00 (Priority 1)

Priority Cost Breakdown:

Priority 1 Estimated Cost: $2,132,300.00 Priority 2 Estimated Cost: $ 443,600.00 Priority 3 Estimated Cost: $ 381,200.00

Total Estimated Structural Cost: $2,957,100.00

Ventilation of Underground Tunnels

We recommend the installation of a ventilation system serving the tunnels included in this report. To control airflow we recommend the installation of air inlets at the end of each ventilated tunnel and centrally exhaust the air at two (2) existing cupolas (tunnel surface enclosures). To control short-circuiting of air in the remaining tunnel cupolas not used for exhaust, each one shall be repaired to minimize airflow through them.

Standing Water Control

We recommend installing two (2) new sumps and pumps including discharge piping to the nearest receiver, and repairing three (3) existing sumps, pumps and discharge piping in the areas with standing water.

Seven (7) intakes at the tunnel ends $273,000.00 Five (5) cupola repair locations $175,000.00 Two (2) exhaust cupola locations $108,000.00 Two (2) new sumps and pumps $ 30,000.00 Three (3) sumps and pumps repaired $ 18,000.00

Total Estimated Ventilation Cost: $604,000.00

Faribault, MN Page 25 of 25

Electrical Upgrades

KFI recommends installing additional light fixtures to supply illumination for the path of egress for emergency exits. Communication cables and other low voltage cables are being run throughout the tunnel and should be installed in raceway to provide protection and marked with the voltage class.

Other minor repairs are listed in the tunnel summaries. Total cost includes providing power for new HVAC. It is assumed that there is adequate capacity to feed these items from existing electrical rooms.

Total Estimated Electrical Cost $60,000.00

Total Estimated Construction Cost: $3,621,100.00