TABLE OF CONTENTS
CONCLUSIONS AND RECOMMENDATIONS ...... 3
BACKGROUND INFORMATION ...... 3
FIELD INSPECTION ...... 6
SPILLWAYS ...... 7 STRUCTURAL STABILITY ...... 7
HYDROLOGY AND HYDRAULICS...... 8
OPERATION AND MAINTENANCE ...... 8
APPENDIX A: PHOTOGRAPHS ...... 10
APPENDIX B: LOCATION MAPS ...... 20
APPENDIX C: FIELD REPORT ...... 22
APPENDIX D: ENGINEERING DATA ...... 29
APPENDIX E: TECUMSEH DAM REPAIR PERMIT DRAWINGS ...... 32
APPENDIX F: RED MILL POND LEGAL LAKE LEVEL STUDY, JULY 18, 2012, FTC&H .... 37
APPENDIX G: TECUMSEH DAM EMERGENCY ACTION PLAN ...... 59
The purpose of this dam safety inspection report and Michigan’s Dam Safety Law is to evaluate the existing condition of the dam. The report is limited to a visual investigation, review of previous inspection reports, plans and data (when available) at the time of the inspection. The contents of the report should not be treated as an in-depth engineering evaluation. Such evaluations or detailed investigations may be recommended based on the findings of this report.
2 CONCLUSIONS AND RECOMMENDATIONS • The Dam is structurally sound, but does show the results of age. • Repairs to the auxiliary spillway that were recommended in 2012 should be addressed immediately, including: − Spillway gates and concrete − Apron concrete • Three areas of reported seepage should be addressed. • Safety items that do not affect the structural stability of the dam should be addressed, for the operation and maintenance of the dam, including: − Fall protection and written procedures − Floatation devices and written procedures − Hand rails − Regrading stairway access − Night time lighting − Follow up of MiOSHA final report • Repairs to the south retaining wall noted in the 2012 report should be completed.
BACKGROUND INFORMATION The Tecumseh Dam and its impoundment, referred to as the Red Mill Pond, are the furthest upstream of three impoundments on the River Raisin in the City of Tecumseh, Michigan. (Refer to Appendix B for a general & detailed location map.)
The Tecumseh Dam consists of two separated areas for impoundment flow. The southern and larger of the two is described as the main spillway. The northern, smaller area is the auxiliary spillway. The main spillway and the auxiliary spillway are located near the south and north ends of the dam, respectively. Drawings from the most recent dam improvement work approved in 2013 & repairs performed in 2014, can be seen in Appendix E.
The main spillway has a 14-foot wide by 9-foot high manually operated vertical steel gate located in the center bay. Flanking the lift gate are two 24-foot wide bays containing timber stop planks. Each row of stop planks contains two wood planks that may be installed and removed with poles by two individuals. The spillway is constructed of reinforced concrete and masonry retaining walls on the north and south ends, and pier/counterfort walls on
3 each side of the lift gate. The walls have been partially overlaid with shotcrete. The apron is composed of reinforced concrete. The toe of the apron is protected by steel sheet piling and riprap.
The auxiliary spillway was formally used as a raceway for flow through an old hydroelectric power plant. There are seven metal sluice gates. The center five gates have manual operators. The southern and northern sluice gates have vertical channels in lieu of operators. It is presumed that these gates are intended to be operated by a vehicle or equipment parked on the bridge above.
The main and auxiliary spillways are separated by earth fill. A concrete retaining wall adjoins the impoundment and structurally connects the main and auxiliary spillway retaining walls. Another concrete retaining wall extends along the impoundment for 60 feet south of the main spillway.
A two-lane, four-span bridge with a walkway on the east side is adjacent to the dam and spans over the spillways. The bridge is owned by the City of Tecumseh and was built after the dam was constructed. At least a third of this bridge appears to be on this site. The auxiliary spillway, north retaining wall was a bridge abutment at the time of the dam construction. The north retaining wall on the main spillway was a bridge abutment for an earlier bridge that spanned the river. The current bridge is structurally independent.
The dam was originally constructed for the Tecumseh Electric Company for electricity generation purposes. The power plant was removed in 1968. The dam now serves to provide impoundment and level control for the Red Mill Pond. The pond is mostly surrounded by large residential properties.
Below is a chronological list of the owners of the dam. Prior to 1928, information on ownership could not be confirmed. − October 1928 George Smith to Tecumseh Electric Company. − November 1928 Tecumseh Electric Company to Lenawee County Light & Power Company. − June 1933 Lenawee County Light & Power Company to Quirk Farms. − July 1944 Quirk Farms to Ford Motor Company.
4 − April 1948 Ford Motor Company to Tecumseh Products Company. − April 2011 Tecumseh Products Company to Red Mill Pond LLC. − October 2012 Red Mill Pond LLC to Lenawee County
On March 2, 2012 a petition by landowners abutting Red Mill Pond was submitted to establish a legal lake level according to Part 307, Public Act 451, 1994 – Inland Lake Levels for Lenawee County to own the dam and maintain a legal lake level. The County Board of Commissioners appointed the Lenawee County Drain Commissioner as the delegated authority to perform the operation and maintenance of the dam and instructed the Lenawee County Prosecuting Attorney to proceed with establishing a legal lake level in Circuit Court. On February 14, 2013 the Honorable Circuit Court Judge Margaret M. S. Noe ordered a legal level to be 777.6 feet NAVD 88 from April to November and 776.6 feet NAVD 88 from November to April of each year. On March 18, 2013 the Honorable Circuit Court Judge Margaret M. S. Noe ordered a special assessment district be established.
Repairs to the dam that occurred in 2014 are listed below. Construction Drawings are on file at the Lenawee County Drain Commissioner’s office.
Main and Auxiliary Spillway Bridge Rehabilitation - Demolish and replace auxiliary spillway footbridge metal components. - Install chain link fencing along main spillway footbridge. - Repair spalls on main spillway concrete deck. - Install locked fence gates on ends of footbridges. - Rehabilitate auxiliary gate floor stands, cranks, and gate stem covers.
Main Spillway - Removed and rebuilt sluice gate. - Replaced seals & sills. - Repair eroded concrete adjacent to gate. - Repaired spalled concrete on pier nosings on each side of gate. - Repaired spalled concrete on south guide wall upstream of spillway. - Reconditioned operating mechanism.
5 South Retaining Wall - Installed hydrophilic sealant into joint at main spillway south abutment wall.
Auxiliary Spillway - Remove and repair deteriorated concrete on counterfort walls. - Installed hydrophilic sealant into north abutment wall joint. - Repaired deteriorated concrete at west end of south abutment wall.
Intermediate Retaining Wall - Repaired spalled concrete along waterline.
The above repairs were recommended by FTC&H in the Legal Lake Level Study of July 18, 2012, included here as Appendix F.
On page 3 of that study, the work completed has been highlighted. Repairs to the south retaining wall that were recommended in the 3- to 6-year range have not been completed, and should be completed soon. The repairs to the auxiliary spillway recommended in the 6- to 9-year timeframe should be completed soon, with an emphasis on the spillway apron concrete.
Photographs taken during the field investigation and inspection are attached in Appendix A. Location, plan, and elevation drawings of the dam are located in the Lenawee County Drain Office. Portions of those maps are provided in Appendix B. Appendix C contains the 6/21/2018 and 2/25/2020 Dam Safety Inspection field reports. Appendix D contains the Michigan Department of Environment, Great Lakes and Energy (EGLE)’s flood discharge engineering data as of January 10, 2019, used in this report. Permit drawings for the Tecumseh Dam Repair are filed with the EGLE Dam Safety Program. Portions of those drawings are provided in Appendix E.
FIELD INSPECTION This section summarizes the observations during the dam inspections and provides background to the recommendations. Directional orientation referring to left or right in the
6 following text is based on standing on top of the dam or earth embankment and looking downstream.
Spillways The dam has two spillways. As used in this Report, the “main spillway” is the south spillway and the auxiliary spillway is the north spillway. The spillways are separated by a 40-foot intermediate concrete retaining wall / earthen embankment.
Main Spillway The main spillway has a 14-foot wide by 9-foot high manually operated vertical steel gate located in the center bay. Flanking the lift gate are two 24-foot wide bays containing timber stop planks. Each row of stop planks contains two wood planks that may be installed and removed with poles by two individuals. The spillway is constructed of reinforced concrete and masonry retaining walls on the north and south ends, and pier/counterfort walls on each side of the lift gate. The walls have been partially overlaid with shotcrete. The apron is constructed of reinforced concrete. The toe of the apron is protected by steel sheet piling and riprap. The main spillway appeared in good condition and no piping or seepage was observed.
Auxiliary Spillway The auxiliary spillway was formally used as a raceway for flow through a hydroelectric power plant. There are seven metal sluice gates. The center five gates have manual operators. The southern and northern sluice gates have vertical channels in lieu of operators. It is presumed that these gates are intended to be operated by a vehicle or equipment parked on the bridge above. See Appendix C for inspection observations and comments.
Structural Stability Based on the visual inspection of the embankments, principal and auxiliary spillway structures, the dam appears to be in a stable condition.
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HYDROLOGY AND HYDRAULICS The Tecumseh Dam has a significant hazard potential classification. Based on this classification, the dam must pass as a minimum the 200-year (0.5% chance) design flood per Section 31516 of Michigan’s Dam Safety Act (Part 315 of Act 451, Public Acts of 1994). EGLE has provided the discharge for a 0.5% chance (200-year) design flood. The correspondence is found in Appendix D. The design flood has not changed from the 2005 and 2012 reports: 2300 cubic feet per second (cfs).
Page 6 of the Red Mill Pond Legal Lake Level Study by Fishbeck Thompson Carr & Huber (FTC&H) (Appendix F) shows a lake elevation of 778 at a discharge of 2300 cfs, which corresponds with the data in the 2005 report by TetraTech with combined discharge, Stoplog Bays and Auxiliary Overflow. The dam has sufficient spillway capacity.
OPERATION AND MAINTENANCE Operation and maintenance (O&M) of the dam is the responsibility of the owner’s caretaker and Lenawee County Drain Commissioner. The Drain Commissioner’s representative monitors daily operations of the dam with a Supervisory Control and Data Acquisition (SCADA) system called Mission Control. Lake levels are reported instantaneously and reported to a web based system. Implementation of maintenance items is coordinated through the Lenawee County Drain Commissioner Office. At a minimum, monthly field inspections of the dam, its earth embankments, and the control structures are done.
A written O&M plan did not exist for the Tecumseh Dam prior to this report. The development of a written O&M was recommended previously and is being prepared concurrent with this report.
The spillways of this dam may require the presence of an operator during high flow events. However, continuous off-site monitoring of the lake levels directs the need for on-site personnel to operate the gates and the timber stop planks. Both spillways require maintenance of the slide gates operators and the timber stop planks. Operation and maintenance activities should be recorded in a bound logbook to document monitoring and maintenance items performed. The earth embankment slopes between the spillways
8
need monitoring and periodic maintenance by way of mowing and tree and brush control. Remove trees and brush and periodically and apply herbicide to maintain the embankments. Remove burrowing animals and plug holes.
Due to the significant hazard potential rating, an Emergency Action Plan (EAP) is required under Part 315 of NREPA. The EAP is included in Appendix G.
It is the responsibility of the owner to annually update the EAP and notify EGLE at the time of the submittal of this Part 315 inspection report.
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APPENDIX A: PHOTOGRAPHS Photographs are used for the comparison of any change in conditions and documentation of previous and future reports.
Main Spillway at Drawdown October 2014
Main Spillway Rehab & New Main Gate November 2014
10
Main Spillway, downstream end April 2018
Main Spillway, downstream end June 2018
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Original Catwalk over Auxiliary Spillway Catwalk over Auxiliary Spillway installed 2014
Previously (2014) installed Catwalk over Auxiliary Spillway June 2018
12
Auxiliary Spillway gates, upstream end at drawdown, November 2014
Auxiliary Spillway gates, debris on upstream end, June 2018
13
Auxiliary Spillway Downstream October 2013
Auxiliary Spillway, downstream end, concrete counterfort wall (Repaired 2014) June 2018
14
Auxiliary Spillway, downstream end April 2018
Auxiliary Spillway, downstream end June 2018
15
Auxiliary Spillway, downstream end, Apron seepage & erosion June 2018
Auxiliary Spillway Floor February 2020
16
Auxiliary Spillway Floor February 2020
Auxiliary Spillway Floor February 2020
17
Potential Seepage Location North End of Auxiliary Gate Structure February 2020
Potential Seepage Location North End of Auxiliary Gate Structure February 2020
18
Potential Seepage Location South End of Main Spillway Structure February 2020
Access Stairway February 2020
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APPENDIX B: LOCATION MAP
DAM LOCATION DAM VICINITY MAP NO SCALE
N
TECUMSEH DAM RED MILL POND LAKE LEVEL CONTROL STRUCTURE
OWNER: LENAWEE COUNTY DRAIN COMMISSIONER WATERWAY: RED MILL POND CITY/ TOWNSHIP: TECUMSEH COUNTY: LENAWEE
20
APPENDIX B: LOCATION MAP
DAM LOCATION
LENAWEE COUNTY N
DAM VICINITY MAP NO SCALE
N
TECUMSEH DAM RED MILL POND LAKE LEVEL CONTROL STRUCTURE
OWNER: LENAWEE COUNTY DRAIN COMMISSIONER WATERWAY: RED MILL POND CITY/ TOWNSHIP: TECUMSEH COUNTY: LENAWEE
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APPENDIX C: FIELD REPORT
DAM SAFETY INSPECTION FIELD REPORTS
1. Name of Dam: Tecumseh Dam Dam ID No. 593 Dates: June 21, 2018 February 25, 2020
2. Owner(s): Lenawee County Operator: Jennifer L. Escott, Lenawee County Drain Commissioner, 320 Springbrook Avenue, Adrian, MI, 49221, (517) 264-4696 and assigned staff at the Lenawee County Drain Commissioner’s office
3. Location of Dam: Section: 27 & 27, Town: 5 South, Range: 4 East, Tecumseh Township County: Lenawee River: Raisin River
4. Persons Present at Inspections: Name Title Date Gregory L. Minshall, PE President, Eng., Inc. 2/25/2020 Brian J. Cenci, P.E. Vice President, Eng., Inc. 6/21/2018 David Berdecia Inspector, Eng., Inc. 6/21/2018 Joseph P. Brezvai Operator’s Representative 6/21/2018 and 2/25/2020 Deputy Drain Commissioner Drain Engineer II
5. Description of Dam: The Tecumseh Dam and its impoundment, referred to as the Red Mill Pond, are the furthest upstream of three impoundments on the River Raisin in the City of Tecumseh, Michigan. The Tecumseh Dam consists of two separated areas for impoundment flow. The southern and larger of the two is described as the main spillway. The northern, smaller area is the auxiliary spillway. The main spillway and the auxiliary spillway are located near the south and north ends of the dam. There are two spillway structures that control the
22
court-established lake levels of 777.6 feet (summer) and 776.6 feet (winter) based on North American Vertical Datum (NAVD) of 1988.
6. Dam Owner Questionnaire Completed? Yes_X_ No___
7. Prior Inspections: FTC&H performed a visual inspection of the Tecumseh Dam on February 28, 2012, and subsequent field inspection and topographic survey on April 6, 2012. A detailed report (condition assessment) of the Tecumseh Dam is provided in the Preliminary Legal Level Study by FTC&H, dated May 24, 2012 and in the Red Mill Pond Legal Lake Level Study by FTC&H, dated July 18, 2012.
A previous inspection was performed of the dam by TetraTech on June 2, 2005. An underwater dive inspection was performed on the same day on the impoundment side (west side) of the dam by Able Diving Company of Munger, Michigan. Another inspection and report had been completed in November 1978 by the U. S. Army Corps of Engineers, Detroit, Michigan District. All of these inspection reports are on file at the Lenawee County Drain Commissioner’s office.
8. Hazard Potential Classification: SIGNIFICANT
ENGINEERING DATA
1. Vicinity Map: 2014 Plans for Dam Rehabilitation by Fishbeck Thompson Carr & Huber (FTC&H) consulting engineers.
2. Geology Reports: No report found on file.
3. Design Analysis: Red Mill Pond lake level study by Fishbeck Thompson Carr & Huber (FTC&H) consulting engineers dated July 18, 2012.
4. Plans: 2014 Plans for Dam Rehabilitation by Fishbeck Thompson Carr & Huber (FTC&H) consulting engineers.
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CONSTRUCTION DATA
1. Rehabilitation: Rehabilitation improvements were made to the dam structure in 2014. The work consisted of replacing the catwalk, replacing the main gate, refurbishing the main gate operating mechanisms, and masonry concrete improvements. During the 2018 and 2020 inspections all of these improvements were observed to be functioning properly.
2. Post Construction Surveys: November 1978, Inspection Report as part of the National Dam Safety Program, belonging to the U.S. Army Corps of Engineers.
3. Construction History: Unknown additional information on the dam may be available from the EGLE Dam Safety Unit.
4. Modifications: Previously, the gates on the dam were motor operated, as noted in the 1978 Inspection Report by the U.S. Army Corps of Engineers. The dam has been repurposed since its construction, from Hydroelectric to Lake Level Control. Multiple modifications were made in 2014, listed above on page 5 and in Appendix F.
5. Borrow Sources: Assumed native and local materials.
OPERATION & MAINTENANCE DATA
1. Operation & Maintenance Plan and Procedures: A separate report is being completed. Records on operation and maintenance activities are kept at the Lenawee County Drain Commissioners office.
2. Monitoring Systems: SCADA system called “Mission Control.” Mission Control uses a pressure transducer located by the southwest corner of the auxiliary spillway wall. Continuous lake levels are transmitted and maybe available on the internet or website used by Lenawee County to monitor its level.
3. Impoundment Level Records: Yes at Lenawee County Drain Office
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4. O&M Records: At Lenawee County Drain Office
5. Dam Incidences/Reports: No known incidences.
6. Pictures: In Report.
INSTRUMENTATION
1. Monuments, Benchmarks, Surveys: 2012 plans by FTC&H had used NAVD of 1988 (NAVD88)
2. Observation Wells: None seen during inspection.
3. Weirs: None used for monitoring embankment seepage flows.
4. Piezometers: None
5. Stream Gage Recorder: None. Lake level monitored by pressure transducer of SCADA “Mission Control System”
DATA
Elevation Top of Dam 781 feet Length of Dam 170 feet Elevation Normal Pool 778 feet Top Width Varies Elevation Tailwater 771 feet Structural Height 18 feet Elevation Concrete Apron 767.6 feet Hydraulic Height (Head) 10.4 feet Below Spillway² Normal Pool Area 110 acres Normal Pool Capacity 265 ac-ft Maximum Pool Area 175 acres Maximum Pool Capacity 865 ac-ft
1. Note: Based on 2012 NAVD of 1988 (NAVD88) benchmark FTC&H had used. 2. Note: Elevation of Concrete Apron Below Spillway from USACE 1978 inspection, adjusted for the NAVD88 datum.
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RESERVOIR
1. Slope: Flat to rolling hills. 2. Bank: Rolling hills and residential areas. 3. Sedimentation: Minimal due to upstream dams and natural lakes.
EARTH EMBANKMENTS
Main: Left: Right: Other: A/Main Dam Total Length: 170 feet Note: Y=yes N=no P=photo LEFT/ RIGHT CREST UPSTREAM DOWNSTREAM SOUTH /NORTH 30’ wide ABUT ABUT Slope N/A, Vertical 2:1 N/A N/A N/A (horiz:vert) Grass Cover Y Y Y Y Y Trees, Brush, etc. N Y N N N Riprap Y Y N/A N Y Erosion N N N Y P Y P Cracks N Y N Y N Settlement N Y P N N Y P
Animal Burrows None seen None seen N None seen None seen
Debris N Y N/A N N Seepage Boils N/A Y P N/A Y P Y P Slough Beaching N N/A N/A N N Drains N/A Y N/A N N
COMMENTS: 1. 40-foot wide intermediate concrete retaining wall and remaining 130 feet of dam itself. 2. Natural plunge pool and downstream channel lined with riprap. 3. Small to medium seepage areas and cracks in the aprons of main and auxiliary spillways. 4. Debris in the auxiliary spillway area. 5. Cracks in the two southwesterly wing walls of the main spillway. 6. Recommended to mow slopes as necessary to prevent overgrowth.
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SPILLWAYS AND OUTLETS
1. Types and Locations: The Tecumseh Dam consists of two separated areas for impoundment flow. The southern and larger of the two is described as the main spillway. The northern, smaller area is the auxiliary spillway. The main spillway and the auxiliary spillway are located near the south and north ends of the dam, respectively. Drawings from the most recent dam improvement work in 2013 and repairs performed in 2014 can be found in Appendix E.
The main spillway has a 14-foot wide by 9-foot high manually operated vertical steel gate located in the center bay. Flanking the lift gate are two 24-foot wide bays containing timber stop planks. Each row of stop planks contains two wood planks that may be installed and removed with poles by two individuals. The spillway is constructed of reinforced concrete and masonry retaining walls on the north and south ends, and pier/counterfort walls on each side of the lift gate. The walls have been partially overlaid with shotcrete. The apron is constructed of reinforced concrete. The toe of the apron is protected by steel sheet piling and riprap.
2. Condition: Good, with exceptions noted. Cracks: One large crack in the spillway wall noted in previous report; continue to monitor. Displacement: None observed. Spalling: Continued problem. Areas previously shotcreted are holding up well. Erosion: None observed. The downstream end of the main spillway retaining wall on the south side should be monitored for deterioration and scour. Seepage and Drainage: While no seepage was observed in the February 2020 site visit, the operator noted three areas of observed seepage during high water events. Those three areas are shown in the photos in Appendix A and should be monitored during monthly and high water site visits. This issue should be included in any proposed repair project.
3. Controls: Gates and stoplogs described in 1. above. Note that in February 2020 the south gate of the auxiliary spillway leaked. This was recommended for a 6- to 9-year repair in 2012 and should be addressed.
Also discussed was the removal and replacement of the stop logs in the main spillway. This is a two-person operation. We recommend the use of fall protection harnesses and personal floatation devices during that operation.
4. Inlet: Red Mill Pond impoundment of the River Raisin.
5. Outlet Channel: The River Raisin.
6. Hydraulic Rating: See Appendix F, Red Mill Pond Legal Lake Level Study, July 18, 2012 by FTC&H.
7. Spillways and Outlets: As described in 1. above. The main spillway is in good condition with no operational problems reported.
27 The auxiliary spillway exhibits serious deterioration of the concrete floor as shown in the photos. This deterioration has worsened between the 2018 and 2020 inspections. This is a repair that should be completed before the next inspection.
8. Other Observations: The Operator discussed concerns that had been brought to their attention regarding the access to the catwalk (see photos). Handrails should be provided and are being addressed. The grade around the base should be raised even with the concrete base. A better drive for truck access should be considered.
Another issue raised is the inclusion of nighttime lighting that could be turned on if operation or maintenance needs to occur after dark. This should be considered.
Some of these comments were the result of a MiOSHA complaint. A final report has not yet been received. When that report is issued, the repairs and/or upgrades should be addressed.
28
APPENDIX D: ENGINEERING DATA FROM 2018
The following email contains the discharge data from EGLE Hydrologic Studies and Dam Safety Unit. The 200-year (0.5%) chance peak flow for the River Raisin at the Tecumseh Dam is 2,300 cfs, unchanged from the 2012 Legal Lake Level Study by FTC&H, and the 2005 Dam Inspection Report by TetraTech.
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APPENDIX E: TECUMSEH DAM REPAIR PERMIT DRAWINGS
32
APPENDIX F: RED MILL POND LEGAL LAKE LEVEL STUDY July 18, 2012 Fishbeck Thompson Carr & Huber, Inc.
Note: Page 3 has been modified to highlight the repairs completed in 2014.
37
Red Mill Pond Legal Lake Level Study
Lenawee County Drain Commissioner
July 18, 2012 Project No. G120238
RED MILL POND TECUMSEH, MICHIGAN
LEGAL LAKE LEVEL STUDY
PREPARED FOR: LENAWEE COUNTY DRAIN COMMISSIONER ADRIAN, MI
JULY 18, 2012 PROJECT NO. G120238
Z:\2012\120238\X_LEGACY\U-PROJ\FINAL REPORT\FINAL STUDY\RED MILL POND - LEGAL LAKE LEVEL REPORT - 7-18-12.DOCX
Fishbeck, Thompson, Carr & Huber, Inc. Engineers • Scientists • Architects • Constructors 1515 Arboretum Drive, SE, Grand Rapids, MI 49546 Telephone: 616-575-3824 TABLE OF CONTENTS
INTRODUCTION ...... 1
EVALUATION OF FACTORS INFLUENCING LEGAL LAKE LEVEL ...... 1 HISTORIC OPERATION OF TECUMSEH DAM ...... 1 TECUMSEH DAM – EXISTING CONDITIONS AND RECOMENDATIONS ...... 2 TOPOGRAPHIC SURVEY ...... 4 HYDROLOGY AND HYDRAULICS ...... 5 PROPERTY OWNER INPUT ...... 6 ENVIRONMENTAL ASSESSMENT ...... 7
RECOMMENDATIONS ...... 8 LEGAL LAKE LEVEL ...... 8 TECUMSEH DAM – IMPROVEMENTS ...... 8 TECUMSEH DAM – OPERATION AND MAINTENANCE ...... 9 SPECIAL ASSESSMENT DISTRICT ...... 10
LIST OF FIGURES
Figure 1 Special Assessment District Figure 2 Survey Elevations Figure 3 River Raisin Plan and Profile Figure 4 Recommended Land Acquisition
LIST OF TABLES
Table 1 Summary of Repair Recommendations, Timeframes, and Estimated Costs Table 2 MDEQ Peak Discharges
LIST OF GRAPHS
Graph 1 Tecumseh Dam Alternative 1 – Hydraulic Rating Curve Graph 2 Tecumseh Dam Alternative 1 – Operation Guide to Maintain 2-ft of Freeboard
LIST OF APPENDICES
Appendix 1 Alternative 1 – Cost Estimate
LIST OF ABBREVIATIONS/ACRONYMS
FTC&H Fishbeck, Thompson, Carr & Huber, Inc. USACE United States Army Corps of Engineers MDEQ Michigan Department of Environmental Quality MDNR Michigan Department of Natural Resources PA Public Act NAVD 88 North American Vertical Datum of 1988 NGVD 29 National Geodetic Vertical Datum of 1929 USFWS United States Fish and Wildlife Service USGS United States Geological Survey
LIST OF UNITS
cfs cubic feet per second elevation all elevations reference NAVD 88, unless noted otherwise
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INTRODUCTION
Red Mill Pond is a 106 acre impoundment located on the River Raisin in the City of Tecumseh, Lenawee County, Michigan. Water levels in Red Mill Pond are regulated by the Tecumseh Dam (also known as the Red Mill Pond Dam) located on the southeast side of the impoundment, adjacent to Evans Street, as shown in Figure 1.
The Tecumseh Dam was originally constructed to impound water to run a hydroelectric plant owned by the Tecumseh Electric Company. Much of the original dam remains today, but in a deteriorated state. The hydroelectric facility was demolished in 1968 and the raceway walls modified to direct water to the River Raisin immediately downstream of the dam.
The Tecumseh Dam is classified as a significant hazard dam, meaning a failure of the dam may cause damage to downstream infrastructure, and is currently regulated under Part 315, Dam Safety, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended. The dam’s most recent owner, Red Mill Pond LLC, filed for bankruptcy and failed to maintain an operator for the dam. The Michigan Department of Environmental Quality (MDEQ) took action in November 2011 to begin a drawdown of the impoundment; however, sufficient funds have since been raised to contract operation of the dam through 2012.
A petition was submitted by property owners surrounding Red Mill Pond to establish a legal lake level under Part 307, Inland Lake Levels, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended. Fishbeck, Thompson, Carr and Huber, Inc. (FTC&H) was retained by the Lenawee County Drain Commissioner (LCDC) to complete a preliminary lake level study during the spring of 2012.
The results of the study, including an inspection of the Tecumseh Dam and recommended improvements, are presented in the Preliminary Legal Lake Level Study by FTC&H dated May 24, 2012. An informative public meeting was held at the Tecumseh Public Schools Administration Building on May 21, 2012 to review the preliminary recommendations, solicit input from impacted property owners and determine a course of action regarding the establishment of a legal lake level for Red Mill Pond.
This Legal Lake Level Study builds upon the evaluation conducted as part of the preliminary study and includes final recommendations for establishing a legal lake level under Part 307, Inland Lake Levels, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended, including improvements to the Tecumseh Dam, and an operational guide for the dam. In addition, a final project cost estimate and recommendation regarding the special assessment district are provided.
EVALUATION OF FACTORS INFLUENCING LEGAL LAKE LEVEL
An in-depth evaluation of the factors influencing the legal lake level of Red Mill Pond was conducted by FTC&H. The results of our evaluation are presented below.
HISTORIC OPERATION OF TECUMSEH DAM
Water levels in Red Mill Pond are regulated by the Tecumseh Dam. Based on available historic reference material, including the 1978 Inspection Report of the Tecumseh Dam by the U.S. Army Corps of
1 Z:\2012\120238\X_LEGACY\U-PROJ\FINAL REPORT\FINAL STUDY\RED MILL POND - LEGAL LAKE LEVEL REPORT - 7-18-12.DOCX
Engineers (USACE), the normal impoundment level in Red Mill Pond is 778 feet NGVD 29, which corresponds to an elevation of approximately 777.6 feet NAVD 88.
FTC&H discussed the operation of the Tecumseh Dam with both the current operator, Troy Robach, and former operator, Wally Pike. Presently, there is no official operating procedure for the dam or benchmark to gauge water levels. Auxiliary (raceway) gates are opened as necessary to regulate the impoundment level. Scour lines along the dam and concrete block wall along the shoreline of Parcel No. XT0-640-0010- 00 are used to gauge water levels.
Three sets of 2x6 stop logs are used to regulate seasonal impoundment levels. Historically, the stop logs were installed in late spring (Memorial Day Weekend) and removed in late October. According to Wally Pike, the stop logs were left in-place during October to increase backwater levels upstream (northwest) of the Southern Michigan Railroad Society Right-of-Way for duck hunters. This past year, a new set of stop logs were installed during the first week of April by Troy Robach.
TECUMSEH DAM – EXISTING CONDITIONS AND RECOMENDATIONS
FTC&H performed a visual inspection of the Tecumseh Dam on February 28, 2012, and subsequent field inspection and topographic survey on April 6, 2012. A detailed inspection report (condition assessment) of the Tecumseh Dam is provided in the Preliminary Legal Lake Level Study by FTC&H, dated May 24, 2012.
A summary of dam repair recommendations, timeframes, and estimated costs is provided in Table 1. Repairs that should be made within the next year for the dam to safely operate include replacing the steel grating footbridge (catwalk) and manual controls for the auxiliary spillway. The main gate should be routinely exercised to ensure it is able to function in emergency situations. Additional safety measures in terms of railing/fencing and locks to control access to dam controls should also be implemented. All other recommended repairs or improvements to the dam should be conducted over the next 3 to Auxiliary Spillway – 2/28/12 12 years based on triennial inspection recommendations.
Alternative 1, as presented in the Preliminary Legal Lake Level Study by FTC&H, dated May 24, 2012, is recommended as the most cost-effective solution to repair the Tecumseh Dam. Alternative 1 consists of rehabilitating the entire dam and retrofitting the main spillway by lowering the sill elevation of the stop-log bays to increase the hydraulic capacity through each bay during extreme flood events. The gates and steel footbridge (catwalk) along the auxiliary spillway would be removed entirely. The gate wall of the auxiliary spillway would be reconstructed and converted into an emergency overflow spillway (weir) with an elevation just above the normal impoundment level. The main gate would be refurbished and continue to be operated manually to control the water level in Red Mill Pond.
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The estimated engineering and construction cost to implement Alternative 1 is $315,000, which assumes a temporary drawdown of the impoundment during construction. The range of estimated costs presented in Table 1 are based on the improvements being completed as part of a single project versus a phased approach. An itemized estimate of project cost is provided in Appendix 1. The estimate does not include study phase, land acquisition, legal, administrative or finance costs.
Table 1 - Summary of Repair Recommendations, Timeframes, and Estimated Costs Tecumseh (Red Mill Pond) Dam, Tecumseh, MI
Item Timeframe Est. Cost
Main and Auxiliary Spillway Bridge Rehabilitation
• Demolish and replace auxiliary spillway footbridge metal components • Install chain link fencing along main spillway footbridge $20,000 to • Repair spalls on main spillway concrete deck Within 1 year $72,500 • Install locked fence gates on ends of footbridges • Rehabilitate auxiliary gate floor stands, cranks, and gate stem covers
Main Spillway
• Remove and recondition sluice gate • Replace gate seals and sills • Repair eroded concrete adjacent to gate • Repair spalled concrete on pier nosings on each side of gate • Repair spalled concrete on south guide wall upstream of spillway • Recondition gate operating mechanism $195,000 to 3 to 6 years South Retaining Wall $205,000
• Repair spalled concrete on east face of wall • Remove corrosion and paint steel sheet pile on west face of wall • Repair spalled concrete on wall crest • Pressure inject hydrophilic sealant into joint at main spillway south abutment wall
Auxiliary Spillway
• Remove and recondition spillway gates • Replace gate seals and sills • Remove and repair deteriorated concrete adjacent to gates • Remove and repair deteriorated concrete on counterfort walls • Pressure inject hydrophilic sealant into north abutment wall joint $100,000 to • Reconstruct apron concrete surface 6 to 9 years $122,000 • Repair deteriorated concrete at west end of south abutment wall
Intermediate Retaining Wall
• Repair spalled concrete along waterline
TOTAL (Single Project vs. Phased Approach) $315,000 to $399,500
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TOPOGRAPHIC SURVEY
FTC&H performed a topographic survey of the Tecumseh Dam and low lying residential structures along the southeast side of Red Mill Pond on April 6, 2012. In addition, a bathymetric survey of the backwater area, upstream of the Southern Michigan Railroad Society Right-of-Way was also conducted. All elevations surveyed by FTC&H were referenced to the North American Vertical Datum of 1988 (NAVD 88).
The Tecumseh Dam consists of a main spillway and auxiliary (raceway) spillway separated by an approximately 40-foot wide intermediate concrete retaining wall / earthen embankment. The main spillway is made up of two, approximately 22-foot wide stop-log bays bordering a central 14-feet wide by 9-feet tall steel lift gate. The auxiliary spillway consists of seven, 4-feet wide by 5-feet tall steel sluice gates, each separated by a concrete pier. The five center gates have manual gate operators, while the outer two gates must be operated by machinery situated on the adjacent Evans Street Bridge. The crest elevation of the dam is approximately 780 feet. The elevation of the stop-log bays varies from approximately 775.4 feet during the winter draw-down to 776.75 feet during the summer, when three sets of 2x6 stop- logs are in-place. The historical impoundment level of Red Mill Pond maintained during summer months is approximately 777.6 feet (778 feet NGVD 29). The impoundment level during the date of our survey was 777.85 feet Main Spillway with Stop Logs – 4/6/12 and all 3 sets of stop-logs were in place.
The minimum finish floor elevation (excluding crawl spaces) of low lying homes located on Red Mill Pond is 784.49 feet (Parcel No. XT0-640-0010-00). The lowest garage floor elevation (780.14 feet at Parcel No. XT0-640-0031-00) is just above the crest elevation of the Tecumseh Dam. Elevations of various structures near the Tecumseh Dam are provided in Figure 2.
FTC&H conducted a bathymetric survey of the Red Mill Pond backwater using a 10-feet long, flat bottom boat with electric trolling motor. The bathymetric survey of the River Raisin extended approximately 3,000 feet upstream of the Southern Michigan Railroad Society Right-of- Way to a point where navigability was no longer possible. The channel bottom elevation varied from approximately 773 feet to 777 feet. The water surface elevation of the backwater varied from approximately 778 feet to 778.5 feet. A profile of the River Raisin is included in Figure 3. River Raisin Upstream RR ROW – 4/6/12
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HYDROLOGY AND HYDRAULICS
The contributing drainage area to the River Raisin at the Tecumseh Dam is approximately 218 square miles. A discharge request was submitted to the Michigan Department of Environmental Quality (MDEQ) at the Tecumseh Dam along the River Raisin for the 10% (10-year) through 0.2% (500-year) return frequencies. A summary of the MDEQ discharge request is included in Table 2.
Table 2 – MDEQ Peak Discharges Peak Flow Rate (cfs) Return Period (Lenawee County) Location Contributing Area 10 -Year 50-Year 100-Year 200-Year 500-Year (square miles) River Raisin (Tecumseh Dam) 218 1,300 1,800 2,100 2,300 2,600 cfs - cubic feet per second
Hydraulic rating curves of the Tecumseh Dam were created using HydroCAD stormwater modeling system software assuming various operating conditions for both existing and proposed dam configurations. Weir elements were analyzed using Chow’s Equation, while gates were analyzed using the Orifice Equation. The model was calibrated by comparing FTC&H surveyed water surface elevation with flow data from the United States Geological Survey (USGS) gauge (Station No. 04175600) along the River Raisin near Manchester.
Part 315, Dam Safety, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended, requires a dam to be capable of conveying the 200-year peak discharge. With all gates open, the existing dam is capable of conveying the 200-year peak discharge of 2,300 cubic feet per second (cfs) with over 2.5 feet of freeboard. Therefore, if operated properly, the dam has sufficient spillway capacity to pass the design flood without exceeding the historic normal water level of 777.6 feet. If the dam is not operated properly, it could overtop or potentially fail, thereby causing significant flooding both upstream and downstream of the dam.
The objective when evaluating alternatives to rehabilitate the Tecumseh Dam is to maintain the current impoundment level of 777.6 feet and 106-acre surface area of Red Mill Pond while ensuring the dam can safely pass the 200-year peak discharge (2,300 cfs) without flooding upstream structures (homes, garages, sheds, etc.), as well as provide for the MDEQ minimum freeboard of 1.5 feet relative to the dam crest elevation of approximately 780 feet. Numerous alternatives were evaluated to simplify the operation and long term maintenance of the dam by reducing the number of control gates.
The recommended Alternative 1 includes lowering the sill elevation of the stop-log bays to an elevation of approximately 774 feet, which will increase the total maximum sets of stop-logs from three to six. The main gate would be refurbished and control water levels in Red Mill Pond. The auxiliary spillway would be converted into an emergency overflow spillway (weir) with an elevation just above the normal impoundment level of 778 feet.
A hydraulic rating curve for the proposed Alternative 1 reconfiguration of the Tecumseh Dam is provided in Graph 1. The rating curve assumes all stop-logs are removed and the main gate is fully open. Both the combined discharge and discharge of each hydraulic element (main gate, stop-log bays and auxiliary overflow) are shown.
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Graph 1 – Tecumseh Dam Alternative 1 – Hydraulic Rating Curve
PROPERTY OWNER INPUT
Input from property owners adjacent to Red Mill Pond was solicited throughout the study. Frank Quinn, liaison for the Friends of Red Mill Pond group, attended both the project kickoff meeting and preliminary study presentation at the Lenawee County Drain Commissioner’s office. Mr. Quinn provided historical as well as anecdotal knowledge about Red Mill Pond and conveyed the concerns of affected property owners.
An informative public meeting was held at the Tecumseh Public Schools Administration Building on May 21, 2012 to review the preliminary recommendations, solicit input from impacted property owners and determine a course of action regarding the establishment of a legal lake level for Red Mill Pond. The public consensus was to proceed with the establishment of a Legal Lake Level for Red Mill Pond and implement the improvements to the Tecumseh Dam as outlined in Alternative 1. Resident’s favored a single project as opposed to a phased approach due to the potential overall cost savings.
Concerns expressed at the May 21, 2012 public meeting primarily focused on the extent of the assessment district as well as the financial responsibility of the City of Tecumseh and Tecumseh Township in funding the improvements to the Tecumseh Dam. Property owners in the backwater areas
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along the River Raisin, upstream of the Southern Michigan Railroad Society Right-of-Way, questioned their inclusion in the special assessment district. Red Mill Pond property owners felt both the City of Tecumseh and Tecumseh Township received a benefit from the impoundment in terms of increased property values, aesthetics, outdoor recreation (boating or canoeing, fishing and hunting), and potential savings to the existing infrastructure (storm sewers which discharge to the lake and Evans Street bridge).
An on-site preliminary application meeting was held with officials from the MDEQ Dam Safety Unit and Water Resources Division on June 21, 2012 to discuss the potential improvements to the Tecumseh Dam as well as temporary drawdown of Red Mill Pond during construction. Overall, the MDEQ indicated that the proposed improvements associated with Alternative 1 appear feasible. Permits under Part 301, Inland Lakes and Streams, Part 315, Dam Safety, and possibly Part 303, Wetlands Protection, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended will be required to complete the work. Additional input from the Fisheries Division of the Michigan Department of Natural Resources (MDNR) and United States Fish and Wildlife Service (USFWS) were also solicited to determine the potential environmental impact of a temporary drawdown. A summary of the input provided by the MDNR and USFWS is included below in the environmental assessment.
ENVIRONMENTAL ASSESSMENT
Maintaining the historic water level (hydrology) of Red Mill Pond under a legal lake level should not have an adverse environmental affect. Wetland vegetation as well as fish and wildlife habitat will be preserved. The homes that border Red Mill Pond within the City of Tecumseh are serviced by sanitary sewer and there are no known septic related issues around Red Mill Pond. Historic recreational uses, including boating, fishing and hunting will be maintained. The potential for shoreline erosion or ice damage should not increase.
MDNR Fisheries Division and USFWS expressed concern regarding the lowering the impoundment level, either temporarily as part of de-watering efforts during construction, or permanently if a legal River Raisin Upstream RR ROW – 4/6/12 lake level is not established. Drawdown of the impoundment could adversely affect the fish community, as well as nesting birds, reptiles and amphibians within the impacted area. The potential change in hydrology could also adversely affect surrounding wetland vegetation depending on the timing and duration of the drawdown. In addition, exposed sediment could erode and be transported downstream. A schedule of ways to mitigate any potential adverse environmental impact during a temporary drawdown of Red Mill Pond is provided below:
• Conduct the drawdown of Red Mill Pond between June and September to mitigate impacts to aquatic life and wildlife.
• Drawdown Red Mill Pond from mid-October through the end of April. This would give wetland creatures an opportunity to relocate and/or prepare for winter (hibernation).
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• Control the rate of drawdown to no more than 6-inches per day to reduce the risk of downstream flooding as well as the rate and total amount of sediment transported.
• Verify that the nesting Bald Eagle chicks in the area are able to fly, or else apply for a “takings” permit with the USFWS.
• Restore the fish community upon completion of the project by re-stocking Red Mill Pond with desirable sport fish species.
According to a 1998 River Raisin Assessment completed by the MDNR Fisheries Division, the Tecumseh Dam has promoted an increase in sedimentation and aquatic vegetation growth within Red Mill Pond. An inadvertent benefit of a temporary drawdown of Red Mill Pond, especially if it is conducted over the winter, could be a reduction in aquatic vegetation.
RECOMMENDATIONS
The following recommendations are based on our analysis and evaluation of the factors influencing the legal lake level of Red Mill Pond.
LEGAL LAKE LEVEL
FTC&H recommends the historic water level of Red Mill Pond be maintained with a seasonal drawdown during the late fall through spring months to accommodate the typically higher flow rates. Therefore, the recommended seasonal legal lake levels for Red Mill Pond to be established under Part 307, Inland Lake Levels, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended, are as follows:
Normal Summer Legal Lake Level • Timeframe: May 15 to May 31 through November 1 to November 15 • Stop Log Elevation: 776.75 feet NAVD 88 • Legal Lake Level: 777.6 feet NAVD 88 (based on flow rate of 125 cfs)
Winter Drawdown Legal Lake Level • Timeframe: November 1 to November 15 through May 15 to May 31 • Stop Log Elevation: 775.4 feet NAVD 88 • Legal Lake Level: 776.6 feet NAVD 88 (based on average flow rate of 160 cfs)
TECUMSEH DAM – IMPROVEMENTS
FTC&H recommends implementing Alternative 1, as presented in the Preliminary Legal Lake Level Study by FTC&H, dated May 24, 2012, as the most cost-effective solution to repair the Tecumseh Dam. Alternative 1 consists of rehabilitating the entire dam and retrofitting the main spillway by lowering the sill elevation of the stop-log bays to increase the hydraulic capacity through each bay during extreme flood events. The gates and steel footbridge (catwalk) along the auxiliary spillway would be removed entirely. The gate wall of the auxiliary spillway would be reconstructed and converted into an emergency overflow
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spillway (weir) with an elevation just above the normal impoundment level. The main gate would be refurbished and continue to be operated manually to control the water level in Red Mill Pond.
The estimated engineering and construction cost to implement Alternative 1 is $315,000, which assumes a temporary drawdown of the impoundment during construction. An itemized estimate of project cost is provided in Appendix 1. The estimate does not include study phase, land acquisition, legal, administrative or finance costs.
In order for Lenawee County to acquire ownership of the dam, the existing parcel on which the dam is located should be split to create a new parcel owned by Lenawee County. The City of Tecumseh presently owns the 2 parcels immediately downstream of the dam. A minimum parcel size of 330 feet (north-south) by 200 feet (east-west) is recommended as shown in Figure 4 to provide for sufficient access, operation, maintenance, and construction of the dam.
TECUMSEH DAM – OPERATION AND MAINTENANCE
A dam operator will need to be retained at an average annual cost of approximately $5,000. In addition to regulating water levels in the Red Mill Pond, the dam operator should also be responsible for routine maintenance activities such as exercising the main gate to ensure proper function, replacing flashboards, removing debris, and monitoring for signs of increased structural deterioration.
Currently the operation of the dam is somewhat of an art. A formal operations and maintenance plan should be developed for the dam. Operation of the dam could be based on real-time data from the USGS gauge (Station No. 04175600) along the River Raisin near Manchester, which is located approximately 13 miles upstream of Red Mill Pond. In addition, a permanent staff gauge should be set near or on the Tecumseh Dam to confirm the impound level. A preliminary operational guide for the Tecumseh Dam is provided in Graph 2. The operational guide is based on the improvements associated with the recommended Alternative 1, to maintain water levels below approximately 778 feet and provide almost 2- feet of freeboard during various discharge scenarios.
Graph 2 – Tecumseh Dam Alternative 1 – Operation Guide to Maintain 2-ft of Freeboard
9 Z:\2012\120238\X_LEGACY\U-PROJ\FINAL REPORT\FINAL STUDY\RED MILL POND - LEGAL LAKE LEVEL REPORT - 7-18-12.DOCX Engineering inspections and reports of the dam are currently required under Part 315, Dam Safety, of the Natural Resources and Environmental Protection act, 1994 PA 451, as amended, at an estimated cost of approximately $3,000 per inspection. Triennial inspections of the dam will also be required under Part 307, Inland Lake Levels, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended, assuming a legal lake level is established.
The estimated annual operation and maintenance costs of the dam are estimated to be between $5,000 and $10,000 annually.
SPECIAL ASSESSMENT DISTRICT
The proposed special assessment district is comprised of parcels that have direct access or navigable access to Red Mill Pond, as shown in Figure 1. Thirty eight (38) parcels (shown in orange) have direct access to Red Mill Pond and another ten (10) parcels (shown in green) have navigable access to Red Mill Pond. In this case, navigable access is based on a 10-feet long, flat bottom boat with electric trolling motor that was used to survey the Red Mill Pond and is similar to a small recreational fishing boat. The Southern Michigan Railroad Society Right-of-Way also abuts Red Mill Pond. While there is presently no public access to Red Mill Pond, both the City of Tecumseh and Tecumseh Township benefit from Red Mill Pond by virtue of enhanced property values, public recreational uses (upstream kayaking/canoeing and downstream fishing), aesthetic value, and infrastructure cost savings.
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PLOT INFO: Z:\2012\120238\CAD\GIS\Map_Document\1 - SPECIAL ASSESSMENT DISTRICT.mxd Date: 7/18/2012 1:56:51 PM User: mb2 2
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XT0-640-0020-00 fishbeck, thompson, carr & huber, inc.
Hard copy is intended to be 8.5"x11" when plotted. Scale(s) indicated and graphic quality may not be accurate for any other size. MB2
USER: XT0-640-0010-00 2:10:34 PM Red Mill Pond TIME: Legal Lake Level Study 7/18/2012 DATE: LAYOUT1 (2) Lenawee County Drain Commissioner City of Tecumseh and Township, Lenawee County, Michigan LAYOUT:
EVANS STREET
SURVEY XT0-320-0210-00 ELEVATIONS G120238
Z:\2012\120238\CAD\PRECD\PRELIMINARY LEGAL LAKE LEVEL SURVEY.DWG NORTH 2 PLOT INFO: &RS\ULJKW2012 All Rights Reserved TE0-121 -4130-00 TE0-121-2550-00 TE0-121-4200-00
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Hard copy is TE0-121-4250-00 intended to be 11"x17" when plotted. Scale(s) indicated and graphic quality may not be accurate for any other size.
RED MILL SOUTHERN MICHIGAN RR ROW TE0-121-2550-00 POND
RIVER RAISIN TE0-121-4250-00 PLAN AND PROFILE
NORTH MB2 Red Mill Pond USER: Legal Lake Level Study 3:18:44 PM TIME: 7/18/2012 DATE: Lenawee County Drain Commissioner City of Tecumseh and Township, Lenawee County, Michigan LAYOUT1 LAYOUT:
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Legal Lake Level Study s APPENDICES
APPENDIX 1
Project: Red Mill Pond / Tecumseh Dam FISHBECK, THOMPSON, Job No: G120238 CARR & HUBER, INC. Date: 5/24/12 1515 Arboretum Drive, SE Engineer: DF2 Grand Rapids, MI 49546 616-575-3824 ALTERNATIVE 1 - Retrofit Main Spillway, Eliminate Auxiliary Gates Engineers Estimate of Probable Construction and Engineering Cost
Item No. Item Description Quantity Unit Unit Price Amount Main and Auxiliary Spillway Bridge Rehabilitation 1 Demolish Auxiliary Spillway Metal Bridge (Catwalk) 1 LS $ 5,000.00 $ 5,000.00 2 Install Chain-link Fence along Main Spillway Bridge 130 LF $ 50.00 $ 6,500.00 3 Install Locked Fence Gates along Main Spillway Bridge 2 EA $ 500.00 $ 1,000.00 4 Repair Spalled Concrete on Main Spillway Bridge Deck 50 SF $ 50.00 $ 2,500.00 Sub-Total $ 15,000.00 Cofferdam 5 Steel Sheet Pilling, Temporary (Main Spillway) 1500 SF $ 30.00 $ 45,000.00 6 MDOT 6A Aggregate - 1' Depth 20 CY $ 50.00 $ 1,000.00 7 Earthfill Cofferdam (Aux. Spillway & Retaining Walls) 500 CY $ 15.00 $ 7,500.00 8 Miscellaneous Dewatering (Pumping, Etc.) 1 LS $ 10,000.00 $ 10,000.00 Sub-Total $ 63,500.00 Auxiliary Spillway 9 Redirect Tecumseh-Clinton Highway Downspout 1 LS $ 2,000.00 $ 2,000.00 10 Remove Spillway Gates and Concrete Abutment 1 LS $ 15,000.00 $ 15,000.00 11 Re-construct Concrete Abutment Wall (No Gates - Only Weir) 50 CY $ 400.00 $ 20,000.00 12 Seal North Abutment Wall Cracks 200 LF $ 50.00 $ 10,000.00 13 Re-construct Concrete Apron 25 CY $ 300.00 $ 7,500.00 14 Re-construct West End of South Abutment Wall 5 CY $ 400.00 $ 2,000.00 Sub-Total $ 56,500.00 Main Spillway 15 Remove and Recondition Sluice (Main) Gate 1 LS $ 20,000.00 $ 20,000.00 16 Replace Gate Seats and Sills 1 LS $ 5,000.00 $ 5,000.00 17 Reconfigure Flashboards (North and South Bay) 1 LS $ 25,000.00 $ 25,000.00 18 Repair Eroded Concrete Adjacent to Main Gate 150 SF $ 50.00 $ 7,500.00 19 Repair Spalled Concrete on Pier Nosing 50 SF $ 50.00 $ 2,500.00 20 Repair Spalled Concrete on South Guide Wall (Upstream) 100 SF $ 50.00 $ 5,000.00 21 Recondition Gate Operating Mechanism 1 LS $ 5,000.00 $ 5,000.00 Sub-Total $ 70,000.00 Intermediate Retaining Wall 22 Repair Spalled Concrete along Waterline 100 SF $ 50.00 $ 5,000.00 Sub-Total $ 5,000.00 South Retaining Wall 23 Re-construct East Face and Wall Crest 40 CY $ 400.00 $ 16,000.00 24 Remove Corrosion and Paint Steel Sheet Piling on West Face 300 SF $ 10.00 $ 3,000.00 25 Seal Retaining Wall (Main Spillway) 100 LF $ 50.00 $ 5,000.00 Sub-Total $ 24,000.00
Construction Cost $ 234,000.00 Contingency $ 21,000.00 Estimated Construction Total $ 255,000.00
Engineering Design, MDEQ Permitting, and Bidding $ 27,000.00 Construction Administration, Inspection and Survey $ 33,000.00 Estimated Total Engineering $ 60,000.00
* Preliminary Total Project Cost Estimate $ 315,000.00 * Does not include Study Phase, Land Acquisition, Legal, Administrative or Finance Costs. Assumes Impoundment Drawdown to Minimize Cofferdam Sheet Piling
U:\Projects\120238\Cost Estimate\Red Mill Pond - Preliminary Cost Estimate 5-24-12.xlsx 5/24/2012 APPENDIX G: TECUMSEH DAM EMERGENCY ACTION PLAN
NOTE: DUE TO RESTRICTIONS FROM THE MICHIGAN EXECUTIVE ORDER 2020-42 (COVID-19), UPDATES TO THE PARCEL OWNERS' CONTACT INFORMATION IS NOT AVAILABLE AS OF THE DATE OF PUBLICATION. INFORMATION ON PAGES 6 AND 7 WAS CURRENT IN DECEMBER OF 2018. EMERGENCY ACTION PLAN Red Mill Pond - Tecumseh Dam
Dam Identification No.: 593 City of Tecumseh and Tecumseh Township Lenawee County, Michigan Located on River Raisin
Prepared for: Jennifer Escott Lenawee County Drain Commissioner 320 Springbrook Avenue Adrian, Michigan 49221
April 2020
Engineer:
Copyright 2020 Eng., Inc. All rights reserved. TABLE OF CONTENTS
Dam Description ...... 1
Emergency Action Plan Activation ...... 2
Action to be Taken ...... 3
Responsibility to Actions ...... 4
Emergency Contact Names and Phone Numbers ...... 5
Potential Flooding – Parcel Owners ...... 6
Appendix A – Location Map
Appendix B – Inundation Area (per 1978 Army Corps of Engineers Report) EMERGENCY ACTION PLAN TECUMSEH DAM – RED MILL POND
Location of Dam (see location map): NW Quarter of Section 27 T-5, R-4-E Tecumseh Township Lenawee County, Michigan
Impounded Body of Water: Red Mill Pond
Spillway Outlet: River Raisin
Dam I.D. No.: 00593
Hazard Potential: Significant
Person Responsible For Operation of Dam: Jennifer Escott, Drain Commissioner Lenawee County Drain Commission 320 Springbrook Avenue - Suite 102 Adrian, Ml 49221 1-(517)-264-4696
Alternate Person Responsible For Operation of Dam: Joseph P. Brezvai, Drain Engineer II Lenawee County Drain Commission 320 Springbrook Avenue - Suite 102 Adrian, Ml 49221 1-(517)-264-4696
Local Emergency Management Coordinator: Craig Tanis Lenawee County Emergency Services 150 W. Maple Avenue Adrian, Ml 49221 1-(517)-264-4756
Page 1 of 7 CIRCUMSTANCES UNDER WHICH THE EMERGENCY ACTION PLAN SHALL BE ACTIVATED
Any circumstance, which indicates potential failure to dam:
An observation of a significant and increasing seepage through the earth embankment.
An observation of a significant and increasing seepage, piping, or cracking of spillway structure.
An alarm or indication from the SCADA system that the impoundment level is dropping.
Failure of dam is occurring:
Water overtopping of spillway structure and earthen embankment.
Loss or structural deterioration of the spillway.
Seepage through the earthen embankment of the dam where the embankment is eroding and collapsing.
Page 2 of 7 ACTIONS TO BE TAKEN
1. Maintain continuous observation of the structure until the situation stabilizes and is considered to be safe.
2. Contact Lenawee County Emergency Coordinator. − Potential failure: inform residents to evacuate or stay on alert. − Failure: inform residents to evacuate.
3. Contact City of Tecumseh Department of Public Works. − Monitor and/or close necessary road crossings.
4. Contact Lenawee County Road Commission. − Monitor and/or close necessary road crossings.
5. Contact City of Tecumseh Waste Water Treatment Plant. − Inform status of emergency.
6. Contact Michigan Department of Environment, Great Lakes and Energy, Dam Safety Unit.
7. Contact Michigan Department of Transportation. − Monitor and/or close necessary road crossings.
8. Lenawee County Drain Commissioner − Operate sluice gate to drawdown impoundment of water for the spillway or earthen embankment emergency, if operation can be accomplished in a safe manner.
9. City of Tecumseh Police & Fire Departments, Lenawee County Emergency Management. − Potential failure: inform residents to evacuate or stay on alert. − Failure: inform residents to evacuate.
Page 3 of 7 RESPONSIBILITY TO ACTIONS
Initial phone calls and continuous observation of dam.
− Lenawee County Drain Commissioner personnel.
Contact Lenawee County Emergency Coordinator.
− Lenawee County Drain Commissioner personnel.
Contact Lenawee County Road Commission, City of Tecumseh Waste Water Treatment Plant, Michigan Department of Transportation, Michigan Department of Environment, Great Lakes and Energy – Dam Safety Unit, City of Tecumseh Fire Department, City of Tecumseh Police Department, City of Tecumseh Department of Public Works.
− Lenawee County Emergency Management. − Lenawee County Sheriff Department.
Warn downstream residents and parcel owners of failure or potential failure of dam.
− Lenawee County Sheriff Department. − Lenawee County Emergency Management. − City of Tecumseh Fire Department. − City of Tecumseh Police Department.
Page 4 of 7 CONTACT NAMES AND PHONE NUMBERS FOR IMPLEMENTATION OF EMERGENCY ACTION PLAN
Lenawee County Drain Commission: − Jennifer Escott 1-517-264-4696 Cell Phone 1-517-260-3289 − Joseph P. Brezvai 1-517-264-4696 Cell Phone 1-419-913-7867 − Ed Scheffler 1-517-264-4692 Cell Phone 1-517-605-3778 − Sewer, Water, Drain After Hours 1-866-737-2862
Lenawee County Sheriff Department & Emergency Management: − Emergency Response 911 − Craig Tanis 1-517-264-4756 − After Hours 1-517-204-6808
Lenawee County Road Commission: − Scott Merillat 1-517-265-6971 Cell Phone 1-517-902-6791 − Jason Schnaidt 1-517-260-0955 − David Craig 1-517-605-0298 − After Hours 911
City of Tecumseh Waste Water Treatment Plant: − Todd Knepper 1-517-489-1305 − Brad Faust 1-517-403-1008 − After Hours 1-517-489-1305
City of Tecumseh Department of Public Works: − Troy Rohrbach 1-517-605-2237
Michigan Department of Environment, Great Lakes and Energy: − Luke Trumble 1-517-420-8923 − After Hours 1-800-292-4706
Michigan Department of Transportation − Chris Kendrik 1-517-263-0564 Cell Phone 1-517-449-4746
City of Tecumseh Police Department: − Office 1-517-423-7494 − After Hours 911
City of Tecumseh Fire Department: − Joe Tuckey 1-517-403-9729 − After Hours 911
Contact information updated 3-3-2020
Page 5 of 7
PARCEL OWNERS THAT MAY BE THREATENED BY FLOODING IMMEDIATELY DOWNSTREAM OF SPILLWAY
PARCEL NO PARCEL OWNER OWNER’S ADDRESS
XTO-300-8082-00 VALDES, FELIPE & ELVIRA 610 N MAUMEE ST, TECUMSEH MI 49286 XTO-320-0170-00 VARNEY, ANESSA 108 BURT ST, TECUMSEH MI 49286 XTO-320-0181-00 FANT, JASON 116 BURT ST, TECUMSEH MI 49286 XTO-320-0182-00 GOAD, THOMAS & JEANNE 112 BURT ST, TECUMSEH MI 49286 XTO-320-0183-00 GERO, ERIC 114 BURT ST, TECUMSEH MI 49286 XTO-320-0201-00 HEDY TRUST, DALE 612 N EVANS ST, TECUMSEH MI 49286 XTO-320-0210-00 CITY OF TECUMSEH 1630 TIMBERWOLF RD, HOLLAND OH 43528 XTO-320-0221-00 KWEST GROUP, LLC 8305 FREMONT PIKE, PERRYSBERG OH 43551 XTO-320-0222-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-320-0231-00 TECUMSEH LTD DIVIDEND HOUSING 3390 PINETREE RD STE 100, LANSING MI XTO-320-0251-00 HOLMES, EDITH 200 BURT ST, TECUMSEH MI 49286 XTO-320-0252-00 HOHENSTEIN, SUSAN 204 BURT ST, TECUMSEH MI 49286 XTO-320-0253-00 SEVALD, SANDRA 206 BURT ST, TECUMSEH MI 49286 XTO-320-0254-00 MAKI, SHAUN & AUDREY 208 BURT ST, TECUMSEH MI 49286 XTO-320-0256-00 CORDER, LARRY & MICHELLE 210 BURT ST, TECUMSEH MI 49286 XTO-320-0260-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-320-0530-00 HANTZ GOLF, LLC 26200 AMERICAN DR, SOUTHFIELD MI 48034 XTO-320-0551-00 AMES, STANLEY & BRIDGET 5080 GLEN EAGLES CT, TECUMSEH MI 49286 XTO-320-0561-00 CITY OF TECUMSEH 103 BROWN ST, TECUMSEH MI 49286 XTO-320-0570-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-320-8010-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-320-8011-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-325-0010-00 DAZINE, MICHELE & ABDALLAH 1448 PIERCE ST, SANTA CLARA CA 95050 XTO-325-0030-00 OSBURN TRUST, JAY & JUDITH 2552 DINIUS ACRES DR, TECUMSEH MI 49286 XTO-325-0040-00 SOWERS, MATHEW & AMY 106 S DIVISION ST, TECUMSEH MI 49286 XTO-325-0050-00 STUDER, SCOTT & COLLEEN 108 S DIVISION ST, TECUMSEH MI 49286 XTO-325-0061-00 DARM, RICHARD & BETTSY 110 S DIVISION ST, TECUMSEH MI 49286 XTO-325-0081-00 CITY OF TECUMSEH PO BOX 396 XTO-325-0620-00 BEARDSLEY, WILLIAM 932 ARBORETUM DR, SALINE MI 48176 XTO-325-0631-00 CITY OF TECUMSEH 309 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-325-0632-00 COATS, SUSAN 898 E CHICAGO BLVD, TECUMSEH MI 49286 XTO-325-0640-00 CONSUMERS ENERGY CO ONE ENERGY PLAZA, JACKSON MI 49201 XTO-422-0020-00 TECUMSEH PLACE APTS, LLC 321 WOODLAND PASS STE 100, EAST LANSING 48823 XTO-422-0030-00 BEARDSLEY, WILLIAM 932 ARBORETUM DR, SALINE MI 48176 XTO-455-0010-00 BETZOLDT, LEROY & KATHLEEN 402 OUTER CR, TECUMSEH MI 49286 XTO-455-0020-00 MACBETH TRUST, JUNE 400 OUTER CT, TECUMSEH MI 49286 XTO-455-0030-00 QUARLES, VAN & DENISE 1132 CAPRICORN BLVD, PUNTA GORDA FL 33983
Page 6 of 7
PARCEL NO PARCEL OWNER OWNER’S ADDRESS
XTO-455-0040-00 LERCH, JEFFREY & JENNIFER 403 OUTER DR, TECUMSEH MI 49286 XTO-455-0050-00 BROWN TRUST, CLARENCE & VELMA 407 OUTER DR, TECUMSEH MI 49286 XTO-460-0460-00 KIRKENDALL, MARK & PAMELA 501 OUTER DR, TECUMSEH MI 49286 XTO-460-0470-00 BENSON, JOHN JR. 505 OUTER DR, TECUMSEH MI 49286 XTO-460-0482-00 TAYLOR, ROBERT & JANICE 601 OUTER DR, TECUMSEH MI 49286 XTO-460-0490-00 BRIDGE, DANIEL 603 OUTER DR, TECUMSEH MI 49286 XTO-460-0500-00 FORD, DOROTHY 609 OUTER DR, TECUMSEH MI 49286 XTO-465-0860-00 DURKEE FAMILY TRUST 611 OUTER DR, TECUMSEH MI 49286 BUENAFLOR, BIENVENIDO & XTO-465-0870-00 FILOMENA 615 OUTER DR, TECUMSEH MI 49286 XTO-465-0880-00 KANE TRUST, PATRICIA 701 OUTER DR, TECUMSEH MI 49286 XTO-860-2030-00 HERRICK TRUST, SHIRLEY 958 FAIRWAY COVE, TECUMSEH MI 49286 XTO-860-2040-00 FELDKAMP, JAMES & CAROLYN 960 FAIRWAY COVE, TECUMSEH MI 49286 XTO-860-3050-00 FOSS, JOHN & JANIS 962 FAIRWAY COVE, TECUMSEH MI 49286 XTO-860-3060-00 VARGA, TERRENCE & DIANE 964 FAIRWAY COVE, TECUMSEH MI 49286 XTO-880-0031-00 STROUD, GLENNA & BILLIE 503 N EVANS ST, TECUMSEH MI 49286 XTO-880-0032-00 HAYES, CAROL 633 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0033-00 LAVIOLETTE, DANIEL 635 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0041-00 DALTON, STEPHEN & SHIRLEY 639 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0042-00 KELLY, TIMOTHY & ANNETTE 641 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0043-00 KOCH, SUSAN 643 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0100-00 SJD INVESTMENTS, LLC 639 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0200-00 SJD INVESTMENTS, LLC 639 SHADOW BROOKE LANE, TECUMSEH MI 49286 XTO-880-0300-00 SJD INVESTMENTS, LLC 639 SHADOW BROOKE LANE, TECUMSEH MI 49286
Page 7 of 7 APPENDIX A
LOCATION MAP APPENDIX A: LOCATION MAP
DAM LOCATION DAM VICINITY MAP NO SCALE
N
TECUMSEH DAM RED MILL POND LAKE LEVEL CONTROL STRUCTURE
OWNER: LENAWEE COUNTY DRAIN COMMISSIONER WATERWAY: RED MILL POND CITY/ TOWNSHIP: TECUMSEH COUNTY: LENAWEE DAM LOCATION
LENAWEE COUNTY N
DAM VICINITY MAP NO SCALE N TECUMSEH DAM RED MILL POND LAKE LEVEL CONTROL STRUCTURE
OWNER: LENAWEE COUNTY DRAIN COMMISSIONER WATERWAY: RED MILL POND CITY/ TOWNSHIP: TECUMSEH COUNTY: LENAWEE APPENDIX B
INUNDATION AREA PER 1978 ARMY CORPS OF ENGINEERS REPORT 200 YEAR FLOOD EVENT - INUNDATION MAP
TECUMSEH DAM EXPECTED INUNDATED AREA FOR 200 YEAR FLOOD EVENT
N SCALE: 1” = 700’