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EMERGENCY ACTION PLAN

FOR

J.M. STUART STATION ASH POND DAMS

ADAMS COUNTY

SPRIGG TOWNSHIP

ODNR-DSWR File No.: POND 3A POND 5 POND 6 POND 7 POND 10

8535-012 8535-003 8535-013 8535-002 8535-011

CLASS II STRUCTURES

SIGNIFICANT HAZARD POTENTIAL CCR UNITS

DAM/CCR UNIT OWNER:

DAYTON POWER & LIGHT COMPANY

J.M. STUART STATION

745 US Hwy 52

Manchester, Ohio 45144

(937) 549-2641 TEL

PREPARED BY:

The Dayton Power & Light Company

&

BUCKEYE ENGINEERING, LTD.

Revised

March 2017

Index

Table of Contents

I. EMERGENCY NOTIFICATION PROCEDURES ................................................................ 1

II. STATEMENT OF PURPOSE ............................................................................................. 2

III. FACILITY DESCRIPTION & POTENTIAL HAZARD .......................................................... 2

IV. EMERGENCY DETECTION, EVALUATION AND CLASSIFICATION ............................... 5

V. RESPONSIBILITIES ........................................................................................................ 10

VI. PREPAREDNESS ............................................................................................................ 11

VII. DOWNSTREAM HAZARD MAPS .................................................................................... 14

VIII. APPENDICIES ............................................................................................................ - 19 -

LIST OF APPENDICES

Appendix A Plans for Training, Exercising, and Updating

Appendix B Distribution of the EAP

Appendix C Glossary of Terms

Appendix D Certifications and Approval of the EAP

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I. EMERGENCY NOTIFICATION PROCEDURES

In In the event of an emergency, the flow chart below must be followed.

Dam Owner Representative #1

Name: John Hendrix

Phone number: (937) 331-4779

Cell phone number: (937) 232-6095

Dam Owner Representative #2

Name: Dan Sweeney

Phone number: (937)-259-7716

Cell phone number: (937)475-8501

The dam owner representatives will determine the alert level at the dam according to Section IV of this EAP and notify 911, ODNR, and the owner’s engineer.

For a Watch Alert Level, notify the parties below that there is a potential dam failure situation developing.

For a Warning Alert Level, notify the parties below that a dam failure is in progress or is imminent. Evacuations and/or road closures are needed.

Refer to section IV to determine the seriousness of the potential emergency and actions to be taken.

ODNR, Dam Safety Engineering Program

24 hour emergency #:

614-799-9538

During business hours

8-5, Monday – Friday

614-265-6731

Adams County Emergency Dispatch

911

Non-emergency:

(937)544-2010

Through the 911 emergency dispatch system, the following entities will be contacted:

Adams Co. EMA office (937) 544-6123 fax 937-544-8251

Manchester/Sprigg/Monroe Twp. Fire Dept. (937) 549-3131

Adams Co. Sheriff Dept. (937) 544-2314

National Weather Service (800) 899-2748

Ohio Department of Transportation (937) 544-3131

Owner Engineer

Name: John Hendrix

Phone number: (937) 331-4779

Cell phone number: (937) 232-6095

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II. STATEMENT OF PURPOSE

The purpose of an Emergency Action Plan (EAP) is to provide the owner/operator of a dam or significant hazard potential coal combustion residuals (CCR) surface impoundment with a clear plan of action when any emergency arises. An emergency is identified as any condition which:

• develops unexpectedly;

• endangers the structural integrity of the dam/CCR unit; and

• could result in the dam/CCR unit’s failure producing downstream flooding, requiring immediate action.

The EAP provides a description of the dam/CCR unit, the area at risk, as well as contact information for all parties involved in responding to or affected by an emergency at the dam/CCR unit. The EAP also outlines what actions are required in the event of an emergency.

By creating and implementing an EAP the owner/operator of a dam/CCR unit can reduce the risk of human life loss or injury, minimize property damage during an unusual or emergency event and potentially lessen their liability. The purpose of this EAP is to define responsibilities and provide procedures designed to identify unusual conditions. These procedures will aid those responsible in taking remedial action and in notifying the appropriate public officials in the event of possible, impending, or actual failure of the dam. This Emergency Action Plan (EAP) was prepared, as required, by OAC 1501:21-15-07 and 40 CFR Part 257.

III. FACILITY DESCRIPTION & POTENTIAL HAZARD

A. Description

There are five class II dams/CCR units at the J.M. Stuart Station which contain varying amounts of coal combustion ash. The following figure provides the location and arrangement of the impoundments. The site is located in Sprigg Township and is bounded by the Ohio River on the south side, US Highway 52 on the north side, Buzzard’s Roost Creek and Landfill No. 9 on the east side, and unoccupied property on the west side. The J.M. Stuart Station lies between ponds 3A and 5.

1. Ash Pond 3A

Ash Pond 3A is an upland reservoir that was constructed in c1978 under ODNR Permit No. 77-97. In 2010, a new liner was installed in the bottom consisting of 2 feet of low permeability (10-7 cm/sec) clay. This pond is used for settling wet sluiced fly ash produced from the combustion of coal in the station generating units. The pond has an area of 52.7 acres at the crest, is 26 feet deep and has a volume of 1,257 acre-feet (427 million gallons) to the crest. This pond is periodically drained and the settled fly ash excavated which is then sent to an ash landfill. A portion of this pond is constructed over the previously closed and abandoned Pond 3. The maximum operating level of this pond is 3 feet below the crest. The outlet is a concrete structure with removable stop logs to control the level.

Potential downstream impacts due to a dam failure include flooding of Ponds 6 and 7, flooding around the coal storage area and discharge to the Ohio River. Discharge to the Ohio River would cause local sediment deposits in the barge fleeting area.

2. Pond 5

Pond 5 is an upland reservoir that was constructed in c1970. Inverter filters were added

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in 2010 at seepage locations. This pond receives influent from plant processes including Unit 4 cooling water blowdown, area drains, bottom ash sluicing, and FGD blowdown. These influents are routed into settling bays in the eastern portion of the pond which discharge into the remaining portion of the pond. The pond has an area of 41.1 acres at the crest, is 40 feet deep and has a volume of 48,000,000 cubic feet to the crest including the permanently filled portion of the pond. This pond is vital to the operation of the plant and cannot be drained without shutting the station down. The maximum operating level of this pond is 5 feet below the crest. The outlet is constructed of driven sheet piling and is routed via a 4-foot diameter corrugated metal pipe to the waste water treatment building. In this building effluent is filtered in rapid sand filters with walnut shell filter media. There is also an emergency overflow weir in this building which will bypass the filters if the level is up to 4 feet below the crest.

Potential downstream impacts due to a dam failure include discharge to the Ohio River. The discharge canal on the north side of Pond 5 is considered a backwater of the Ohio River. Discharge to the Ohio River would cause local sediment deposits.

3. Ash Pond 6

Ash Pond 6 is an upland reservoir that was constructed in 1978 as an ash sluice pond. The pond was partially re-excavated in c1983 and now serves as a collection pond for ash sluicing water from Ponds 3A, 7 and 10, coal storage area drainage, and Landfill 11 storm water, contact water and leachate. The pond has an area of 36.7 acres at the crest, is 31 feet deep and has a volume of 60,500,000 cf to the crest. 19.2 aces of this pond are permanently filled leaving an operating area of 17.5 acres and volume of 7,000,000 cubic feet to the crest. The maximum operating level of this pond is 3 feet below the crest. The outlet is a concrete structure with adjustable weirs which discharges into the pH treatment building.

Potential downstream impacts due to a dam failure include discharge to Pond 7 or Buzzard’s Roost Creek, a tributary leading to the Ohio River. If Pond 7 is in service at the time of a breech, there would be no impact as both ponds operate at the same level. If Pond 7 would be empty at the time, it has the volume to contain the discharge of Pond 6. A breech in the east dam would result in local flooding of, and sedimentation in, Buzzards Roost Creek. Sediment deposits may also be carried into the Ohio River. There are no facilities along this portion of Buzzard’s Roost Creek which would be impacted.

4. Ash Pond 7

Ash Pond 7 is an upland reservoir that was constructed in 1978. This pond is used for settling wet sluiced fly ash produced from the combustion of coal in the station generating units. The pond has an area of 38.4 acres at the crest, is 30 feet deep and has a volume of 42,400,000 cubic feet to the crest. In c1983 a portion of this pond was permanently filled and a portion developed into Pond 7A. Pond 7A is a small basin fully contained within the original Pond 7. ODNR considers Ponds 7 and 7A to be one structure. Pond 7 is periodically drained and the settled fly ash excavated, which is then sent to an ash landfill. The maximum operating level of this pond is 3 feet below the crest. The outlet is composed of two 36-inch High Density Polyethylene pipes encased in concrete which flows to Pond 6.

Potential downstream impacts due to a dam failure are discharge to Buzzard’s Roost Creek, a tributary leading to the Ohio River, or to the Ohio River directly. A breech in the east dam would result in local flooding of, and sedimentation in, Buzzards Roost Creek.

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Sediment deposits may also be carried into the Ohio River. A breech in the south dam would result in sedimentation in the Ohio River. No structures would be impacted from this inundation.

5. Ash Pond 10

Ash Pond 10 is a partially incised upland reservoir that was constructed in 2001 under ODNR Permit No. 00-291. This pond is used for settling wet sluiced fly ash produced from the combustion of coal in the station generating units. The pond has an area of 28.9 acres at the crest, is 40 feet deep and has a volume of 36,000,000 cubic feet to the crest. This pond is periodically drained and the settled fly ash excavated, which is then sent to an ash landfill. The maximum operating level of this pond is 3 feet below the crest. The outlet is a concrete structure with removable stop logs to control the level.

Potential downstream impacts due to a dam failure are discharge to Little Three Mile Creek and the plant discharge canal, localized flooding of surrounding areas which potentially could include a portion of US Highway 52, station parking areas, the station entrance road, and a security building. Flooding toward US Highway 52 would result in hazardous driving conditions and would warrant road closure.

B. Potential Hazards

A dam breech and inundation of the surrounding areas with water and coal ash is the main potential hazard/safety emergency associated with the station impoundments/CCR units. . Ponds 5, 6, & 7 will only impact the Ohio River and plant access roads. Pond 10 has

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potential to impact US Highway 52 and the plant entrance road. In the event of an emergency, other means of access to the facility can be opened. Pond 3A, located east of the coal pile potentially could impact some outlying structures in the coal handling area. Innundation toward the river would have impacts to the water quality which may affect downstream water supplies

IV. EMERGENCY DETECTION, EVALUATION AND CLASSIFICATION

In order to determine whether an emergency condition exists, the entire dam/CCR unit must be inspected or monitored on a regular basis as outlined in the dam’s Operation, Maintenance, and Inspection Manual. When inspecting the dam/CCR unit, pay particular attention to known past problem areas and other areas of current concern as listed below, then use the “Alert Level” table to determine the severity of problems and the “Classification of Conditions” table to determine the appropriate actions to take.

The routine inspection must include:

• Monitor the outlet works for obstructions, seepage around conduits, and significant or abnormal changes in water level.

• Monitor known cracks, earth slides/slips, seepage, and sinkholes. • Monitor known seepage areas. • Monitior pond inlet areas for excessive coal ash build-up at pond inlets. • Note General conditions of the impoundments

After significant rainfall, dams/CCR units are more likely to develop problems such as slides, spillway obstructions, seepage, or structural problems. If more than two inches of rain occurs or the pool level rises more than one foot within 24 hours, monitor the dam/CCR unit daily until the pool level begins to decrease. Inspect the dam/CCR unit as described in item 1 above and record rainfall amount and pool elevation. This information can be used to establish how the dam/CCR unit responds to rainfall. It may be found that there is a correlation between pond level and seepage, which would need to be monitored and addressed.

The following references may be used for additional assistance in understanding specific problems with dams and obtaining rainfall data.

• Division of Soil and Water Resources Facts sheets and other publications: http://water.ohiodnr.gov/safety/dam-safety#ADD

• Maysville weater data: http://www.kymesonet.com/live_data.html?site=WSHT&unittype=E&offset=0&GO=Go%2FRefresh

• NOAA rainfall maps: http://www.srh.noaa.gov/ridge2/RFC_Precip/

Examples of Emergency Situations

The following are examples of conditions that usually constitute an emergency situation that may occur at a dam/CCR unit. These are examples only, and may or may not apply to all dam/CCR units. Adverse or unusual conditions that can cause the failure of a dam are typically related to aging or design and construction oversights. Extreme weather events that exceed the original designed conditions can cause significant flow through the auxiliary spillway or overtopping of the embankment. However, accidental or intentional damage to the dam may also result in emergency conditions. The conditions have been grouped to identify the most likely emergency-level condition. The groupings are provided as guidance

http://water.ohiodnr.gov/safety/dam-safety#ADD

http://www.kymesonet.com/live_data.html?site=WSHT&unittype=E&offset=0&GO=Go%2FRefresh

http://www.kymesonet.com/live_data.html?site=WSHT&unittype=E&offset=0&GO=Go%2FRefresh

http://www.srh.noaa.gov/ridge2/RFC_Precip/

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only. Not all emergency conditions may be listed, and the dam/CCR unit operator is urged to use conservative judgment in determining whether a specific condition should be defined as an emergency situation.

A. Earth Spillway Flows

• Watch Alert Level—Potential dam failure situation; rapidly developing:

• Significant erosion or headcutting of the spillway is occurring, but the rate does not appear to threaten an imminent breach of the spillway crest that would result in an uncontrolled release of the reservoir.

• Flow through the earth auxiliary spillway is or is expected to cause flooding that could threaten people, homes, and/or roads downstream from the dam/CCR Unit.

• Warning Alert Level—Urgent; dam failure appears imminent or is in progress:

• Significant erosion or headcutting of the spillway is occurring at a rapid rate, and a breach of the control section appears imminent.

• Flow through the earth auxiliary spillway is causing flooding that is threatening people, homes, and/or roads downstream from the dam/CCR Unit.

B. Embankment Overtopping

• Increased Monitoring— Conditions merrit increased monitoring:

• The reservoir level is within 18 inches from the top of the dam.


• The reservoir level is within 12 inches from the top of the dam.


• The reservoir level has exceeded the top of the dam, and flow is occurring over the embankment.

C. Seepage and Sinkholes


• Cloudy seepage or soil deposits are observed at seepage exit points or from internal drain outlet pipes.

• New or increased areas of wet or muddy soils are present on the downstream slope, abutment, and/or foundation of the dam, and there is an easily detectable and unusual increase in volume of downstream seepage.

• Significant new or enlarging sinkhole(s) near the dam or settlement of the dam is observed.

• Reservoir level is falling without apparent cause.

• The following known dam defects are or will soon be inundated by a rise in the reservoir:

• Sinkhole(s) located on the upstream slope, crest, abutment, and/or foundation of the dam; or

• Transverse cracks extending through the dam, abutments, or foundation.


• Rapidly increasing cloudy seepage or soil deposits at seepage exit points to the extent that failure appears imminent or is in progress.

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• Rapid increase in volume of downstream seepage to the extent that failure appears imminent or is in progress.

• Water flowing out of holes in the downstream slope, abutment, and/or foundation of the dam to the extent that failure appears imminent or is in progress.

• Whirlpools or other evidence exists indicating that the reservoir is draining rapidly through the dam or foundation.

• Rapidly enlarging sinkhole(s) are forming on the dam or abutments to the extent that failure appears imminent or is in progress.

• Rapidly increasing flow through crack(s) eroding materials to the extent that failure appears imminent or is in progress.

D. Embankment Movement and Cracking

• Watch Alert Level —Potential dam failure situation; rapidly developing:

• Settlement of the crest, slopes, abutments and/or foundation of the dam that may eventually result in breaching of the dam.

• Significant increase in length, width, or offset of cracks in the crest, slopes, abutments, and/or foundation of the dam that may eventually result in breaching of the dam.


• Sudden or rapidly proceeding slides, settlement, or cracking of the embankment crest, slopes, abutments, and/or foundation, and breaching of the dam appears imminent or is in progress.

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Alert Level Table

Event Situation Alert Level *

Earth Spillway Flow

Reservoir water surface elevation at spillway crest or spillway is flowing with no active erosion

Monitor

Spillway flowing with active gully erosion Watch

Spillway flow that could result in flooding of people downstream Watch

Spillway flowing with an advancing headcut that is threatening the control section

Warning

Spillway flow that is flooding people downstream Warning

Embankment Overtopping

No overtopping flow but water level in lake within 18 inches of crest.

Monitor each shift

No overtopping flow but water level in lake within 12 inches of crest.

Watch

Overtopping flow eroding the embankment slope Warning

Seepage New seepage areas in or near the dam with clear flow Monitor

New seepage areas with cloudy discharge or increasing flow rate

Watch

Heavy seepage with active erosion. Muddy flow and/or sand boils

Warning

Sinkholes Observation of new sinkhole in reservoir area or on embankment

Watch

Rapidly enlarging sinkhole on the embankment with visible flow or whirlpool in the lake.

Warning

Embankment Cracking

New cracks in the embankment greater than 1/4-inch wide without seepage

Monitor

Cracks in the embankment with seepage Watch

Embankment Movement

Visual movement/slippage of the embankment slope Monitor

Instruments Instrumentation readings beyond predetermined values Monitor

Earthquake Measurable earthquake felt or reported on or within 50 miles of the dam

Monitor

Earthquake resulting in visible damage to the dam or appurtenances

Watch

Earthquake resulting in uncontrolled release of water from the dam

Warning

Security Threat Verified bomb threat that, if carried out, could result in damage to the dam

Watch

Detonated bomb that has resulted in damage to the dam or appurtenances

Warning

Sabotage Damage to dam or appurtenances with no impacts to the functioning of the dam

Monitor

Damage to dam or appurtenances that has resulted in seepage flow

Watch

Damage to dam or appurtenances that has resulted in uncontrolled water release

Warning

* See the “Classification of Conditions” table on the following page for Alert Level description and recommended action.

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Classification of Conditions Table

Alert Level Description Action

Monitor Unusual event, slowly developing, not an immediate threat to the dam.

Dam/CCR Unit owner representative must inspect the dam.

Document the incident and report findings to the Dam Safety Engineer. The Dam Safety Engineer Shall evaluate and report to the ODNR, Dam Safety Engineering Program if appropriate.

Obtain instructions regarding the next course of action from the Dam Safety Engineer and/or ODNR.

Watch Unsafe situation that may lead to failure of the dam but not an immediate threat.

Begin notifications according to Section I: Notification Flowchart in this EAP.

Begin constant surveillance of the dam/CCR Unit.

Warning

Urgent situation. Failure is occurring or about to occur. Or, areas downstream are flooding due to spillway flow. Evacuation of downstream area necessary.

Begin notifications according to Section I: Notification Flowchart in this EAP.

Begin constant surveillance of the dam.

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V. RESPONSIBILITIES

A. Dam/CCR Unit Owner

• Once a potential emergency condition is identified the identifying person shall immediately report the condition to the Dam Owner Representative.

• The Dam Owner Representative may refer to the Owner’s Dam Safety Engineer (internal or external) to determine the appropriate action according to the guidelines in Section IV.

• If so determined the Dam Owner Representative or Owner’s Dam Safety Engineer shall contact ODNR, Dam Safety Engineering Program and Adams County Emergency Dispach (911) who in turn will contact other agencies.

• The Dam Owner Representative or Owner’s Dam Safety Engineer shall notify the Corporate Communications Director of the situation and direct all press contacts to this person.

• The Dam Owner Representative or Owner’s Dam Safety Engineer shall initiate remedial or mitigating actions to eliminate the emergency conditions. The Dam Safety Engineer shall oversee remedial actions.

• Once the emergency condition is eliminated the Owner’s Dam Safety Engineer shall terminate the emergency actions.

• Conduct periodic and cause-driven inspections. • Facilitate an annual face-to-face meeting or exercise between representatives of the

Owner and local emergency responders.

B. Adams County Emergency Dispatch (911)

• Contact local emergency responders.

C. County Emergency Management Agencies (EMA)

• Once notified the County EMA shall coordinate local emergency response and shall direct local responding agencies.

D. County Sheriff/Fire Department/Ohio Department of Transportation

• Lead evacuation and road closure efforts when/if required.

E. ODNR, Dam Safety Engineering Program

• Provides technical guidance during an emergency.

• Can initiate emergency actions at the dam if the dam owner is not fulfilling their responsibilities.

• Perform periodic dam safety inspections usually no more frequently than every five years.

F. Owner’s Dam Safety Engineer

• Provides technical guidance.

• Coordinates with ODNR for remedial actions and the County EMA.

• Shall oversee the inspection program and shall review all routine and non-routine inspections reports.

• May also serve as the EAP Coordinator.

G. EAP Coordinator

• Shall Review EAP annually and revise as needed.

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• Shall maintain contact with County EMA and coordinate review and training exercises with local officials.

• Shall serve as the owner’s EAP contact.

VI. PREPAREDNESS

After all the proper notifications have been made according to the Flowchart, the following actions should be taken. If time permits, ODNR and the dam owner’s engineer should be contacted for technical consultation.

A. Emergency remedial actions

If time permits, the following emergency remedial actions should be considered for Emergency “Watch” conditions. Immediate implementation of these remedial actions may delay, moderate, or prevent the failure of the dam/CCR unit. Several of the listed adverse or unusual conditions may be apparent at the dam/CCR unit at the same time, requiring implementation of several modes of remedial actions. Close monitoring of the dam/CCR unit must be maintained to confirm the success of any remedial action taken. See Resources Availability (pg.12) for sources of equipment and materials to assist with remedial actions.

1. Embankment Overtopping

a. Initiate generating unit curtailment or shut down eliminating all but critical inflow into the impoundment.

b. Open drain at the fly ash pond outlet structure.

c. If caused by a local conditions at inlets, mobilize equipment to clear deposited material from the inlet area.

d. Monitor dam crest and initiate immediate repair of any breech and eroded areas.

2. Seepage and Sinkholes



c. Continue lowering the water level until the seepage stops. Implement pumping if not stopped upon water level reaching the level of the drain.

d. If the entrance to the seepage origination point is observed in the reservoir (possible whirlpool) and is accessible, attempt to reduce the flow by plugging the entrance with readily available materials such as hay bales, bentonite, soil or rockfill, or plastic sheeting.

e. Cover the seepage exit area(s) with several feet of sand/gravel to hold fine-grained embankment or foundation materials in place. Alternatively, construct sandbag or other types of ring dikes around seepage exit areas to retain a pool of water, providing backpressure and reducing the erosive nature of the seepage.

f. Prevent vehicles and equipment from driving between the seepage exit points and the embankment to avoid potential loss from the collapse of an underground void.

3. Embankment Movement


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c. If needed, provide pumps to lower the impoundment to a safe level at a rate commensurate with the urgency and severity of the condition of the slide or slump. If the gate is damaged or blocked, pumping or siphoning may be required.

d. Repair settlement of the crest by placing sandbags or earth and rockfill materials in the damaged area to restore freeboard.

e. Stabilize slides by placing a soil or rockfill buttress against the toe of the slide.

4. Earthquake

a. Immediately conduct a general overall visual inspection of the dam.

b. Perform a field survey to determine if there has been any settlement and movement of the dam embankment, spillway, and low-level outletworks.

c. Drain the reservoir, if required.

B. Site-Access

The Stuart Station main entrance is located six miles east of Manchester, Ohio on US Hwy 52 near the Adams-Brown County line. The site can be accessed from Manchester by travelling west on US Hwy 52 or from Aberdeen by traveling east on US Hwy 52. From Columbus the site can be accessed by traveling South on US Hwy 23 to Piketon, west on Ohio Hwy 32 Peebles, south on Ohio Hwy 41 to Bentonville, south on Ohio Hwy 136 to Manchester, and west on US Hwy 52.

The site is staffed 24 hours per day, seven days per week.

West Union, OH

Manchester, OH

Ripley

JM Stuart Station

Maysville, KY

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C. Resources Availability

The following list represents resources that potentially could be used to respond to a crisis situation.

Company Materials or Equipment Phone No.

DP&L, Stuart Station

745 U.S. Route 52

Manchester, OH 45144

Dam/CCR Unit Owner (937) 549-2641

S&ME

11699 Chesterdale Road

Cincinnati OH 45246

Engineering Consultant Ben Dusina

(513) 771-8471

Headwaters Resources

PO Box 548

Aberdeen, OH 45010

Equipment and operators (937) 549-1805

Brown County Rental

8108 US 52 West

Aberdeen, OH 45101

Equipment Rental Jim Harris

(937) 795-2740

Art’s Rental Equipment, Inc.

215 East 6th St.

Newport, KY 41071

Equipment Rental (859) 431-4519

Maysville Rental

P O Box 653

815 E Maple Leaf Rd

Maysville, KY 41056

Equipment Rental

Terry Applegate

(606) 759-5717

(606) 584-2852 Mobile

Sunbelt Rental

10060 Toben Drive Independence 41051

Equipment Rental

Justin Whiting

(5136814488

Michael Dynes

8596099625

Maysville Ready-Mix

8030 US Highway 52

Aberdeen, Ohio 45101

Concrete (937) 795-2020

Hanson Aggregates

848 Plum Run Rd

Peebles, OH 45660

Aggregate Materials

Producer (937) 587-2671

Tully Transport

9605 Mason Lewis Rd

Maysville, KY 41056

Aggregate Materials

Hauler

Harry Tully

(606) 564-3129

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VII. DOWNSTREAM HAZARD MAPS

POND 3A INUNDATION MAP

Failure of the Pond 3A dam has potential to impact Water Quality in the Ohio River.

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POND 5 INUNDATION MAP

Failure of the Pond 5 dam has potential to impact water quality in the Ohio River and in the Plant Discharge Canal.

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Failure of the Pond 6 dam has potential to impact water quality in the Ohio River and Buzzards Roost Creek.

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Failure of the Pond 7 dam has potential to impact water quality in the Ohio River and Buzzards Roost Creek.

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Failure of the Pond 10 dam has potential to impact US Hwy 52, Little Threemile Creek, the Discharge Canal, and outlying plant buildings.

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VIII. APPENDICES

STUART STATION ASH POND DAM EMERGENCY ACTION PLAN

Appendix A

Plans for Training, Exercising, and Updating the Emergency Action

The purpose of an annual review of the EAP and training for dam/CCR unit owners and operators, and emergency responders is to ensure that all contact information listed is accurate and that personnel are familiar with the EAP and understand their role in responding to an emergency.

The dam/CCR unit owner, Dayton Power & Light Company, will be responsible for reviewing annually, updating, and distributing copies of the EAP. Based on changes identified in the annual review, copies of updated pages will be provided to all holders of the EAP.

The dam/CCR unit owner/operator will also schedule an annual face-to-face meeting or exercise with local emergency management professionals to ensure that they are familiar with the hazzard and can respond efficiently.


Appendix B

Distribution of the EAP

This EAP shall be distributed to those Individuals listed below.

Distribution List

Name & Title Organization Address Date

ODNR Dam Safety 2045 Morse Road, Building B-1 Columbus, OH 43229

Plant Manager DP&L, JM Stuart Station internal

Operations Manager

DP&L, Operations internal

Safety Director DP&L, Safety internal

Mary Ann Kabel, Director

DP&L Corporate Communications

internal

Karen Sapp, Director

Adams County EMA 31 Logans Ln West Union, Ohio 45693

Adams County Emergency Dispatch

110 West Main Street West Union, OH 45693

Manchester/Sprigg/Monroe Twp. Fire Department

Manchester Fire Department 29 W Third ST Manchester, OH 45144


Appendix C

Glossary of Terms

Abutment – That part of the valleyside against which the dam is constructed. The left and right abutments of dams are defined with the observer looking downstream from the dam.

Acre-foot – A unit of volumetric measure that would cover 1 acre to a depth of 1 foot. One acre-foot is equal to 43,560 cubic feet or 325,850 gallons.

Appurtenant Structures – The structures or machinery auxiliary to dams which are built to operate and maintain dams; such as outlet works, spillway, powerhouse, tunnels, etc.

Berm – A nearly horizontal step (bench) in the upstream or downstream sloping face of the dam.

Boil – A disruption of the soil surface due to water discharging from below the surface. Eroded soil may be deposited in the form of a ring (miniature volcano) around the disruption.

Breach – An opening through the dam that allows draining of the reservoir. A controlled breach is an intentionally constructed opening. An uncontrolled breach is an unintended failure of the dam.

Conduit – A closed channel (round pipe or rectangular box) that conveys water through, around, or under the dam.

Control section – A usually level segment in the profile of an open channel spillway above which water in the reservoir discharges through the spillway.

Crest of Dam – The crown of an overflow section of the dam. In the United States, the term "crest of dam" is often used when "top of dam" is intended. To avoid confusion, the terms crest of spillway and top of dam should be used in referring to the overflow section and dam proper, respectively.

Cross section – A slice through the dam showing elevation vertically and direction of natural water flow horizontally from left to right. Also, a slice through a spillway showing elevation vertically and left and right sides of the spillway looking downstream.

Cutoff Wall – A wall of impervious material (e.g., concrete, asphaltic concrete, steel sheet piling) built into the foundation to reduce seepage under the dam.

Dam – An artificial barrier generally constructed across a watercourse for the purpose of impounding or diverting water.

Dam failure – The uncontrolled release of a dam’s impounded water.

Dam Operator – The person(s) or unit(s) of government with responsibility for the operation and maintenance of dam.

Drain, toe or foundation, or blanket – A water collection system of sand and gravel and typically pipes along the downstream portion of the dam to collect seepage and convey it to a safe outlet.

Drainage area (watershed) – The geographic area on which rainfall flows into the dam.

Drawdown – The lowering or releasing of the water level in a reservoir over time or the volume lowered or released over a particular period of time.

Embankment – Fill material, usually earth or rock, placed with sloping sides.

Emergency – A condition that develops unexpectedly, endangers the structural integrity of the dam and/or downstream human life and property, and requires immediate action.


Emergency Action Plan (EAP) – A formal document identifying potential emergency conditions that may occur at the dam and specifying preplanned actions to minimize potential failure of the dam or minimize failure consequences including loss of life, property damage, and environmental impacts.

Evacuation map – A map showing the geographic area downstream of a dam that should be evacuated if it is threatened to be flooded by a breach of the dam or other large discharge.

Failure – An incident resulting in the uncontrolled release of water from a dam.

Filter – The layers of sand and gravel in a drain that allow seepage through an embankment to discharge into the drain without eroding the embankment soil.

Foundation of Dam – The natural material on which the dam structure is placed.

Freeboard – Vertical distance between a stated water level in the reservoir and the top of dam.

Gate, slide or sluice, or regulating – An operable, watertight valve to manage the discharge of water from the dam.

Groin – The area along the intersection of the face of a dam and the abutment.

Hazard classification – A system that categorizes dams (high, significant, or low) according to the degree of their potential to create adverse incremental consequences such as loss of life, property damage, or environmental impacts of a failure or misoperation of a dam.

Height, dam – The vertical distance between the lowest point along the top of the dam and the lowest point at the downstream toe, which usually occurs in the bed of the outlet channel.

Hydrograph, inflow or outflow, or breach – A graphical representation of either the flow rate or flow depth at a specific point above or below the dam over time for a specific flood occurrence.

Incident Commander – The highest predetermined official available at the scene of an emergency situation.

Instrumentation – An arrangement of devices installed into or near dams that provide measurements to evaluate the structural behavior and other performance parameters of the dam and appurtenant structures.

Notification – To immediately inform appropriate individuals, organizations, or agencies about a potentially emergency situation so they can initiate appropriate actions.

Piping – The progressive destruction of an embankment or embankment foundation by internal erosion of the soil by seepage flows.

Primary Spillway (Principal Spillway) – The principal or first used spillway during flood flows.

Probable Maximum Precipitation (PMP) or Flood (PMF) – The theoretically greatest precipitation or resulting flood that is meteorologically feasible for a given duration over a specific drainage area at a particular geographical location.

Reservoir – The body of water impounded or potentially impounded by the dam.

Riprap – A layer of large rock, precast blocks, bags of cement, or other suitable material, generally placed on an embankment or along a watercourse as protection against wave action, erosion, or scour.

Risk – A measure of the likelihood and severity of an adverse consequence.

Scarp – The nearly vertical, exposed earth surface created at the upper edge of a slide or a


breached area along the upstream slope of an earthen embankment.

Seepage – The natural movement of water through the embankment, foundation, or abutments of the dam.

Slide – The movement of a mass of earth down a slope on the embankment or abutment of the dam.

Spillway (auxiliary or emergency) – The appurtenant structure that provides the controlled conveyance of excess water through, over, or around the dam.

Spillway capacity – The maximum discharge the spillway can safely convey with the reservoir at the maximum design elevation.

Spillway crest – The lowest level at which reservoir water can flow into the spillway.

Stilling Basin – A basin constructed to dissipate the energy of fast-flowing water, e.g., from a spillway or bottom outlet, and to protect the river bed from erosion.

Stoplogs – Logs or timbers, steel or concrete beams placed on top of each other with their ends held in guides on each side of a channel or conduit.

Storage – The retention of water or delay in runoff either by planned operation, as in a reservoir, or by temporarily filling the overflow areas, as in the progression of a flood crest through a natural stream channel.

Tailwater – The body of water immediately downstream of the embankment at a specific point in time.

Toe of dam – The junction of the upstream or downstream face of an embankment with the ground surface.

Top of dam (crest of dam) – The elevation of the uppermost surface of an embankment which can safely impound water behind the dam.

Trash Rack – A structure of metal or concrete bars located in the waterway at an intake to prevent the entry of floating or submerged debris.

Valve – In general, a device fitted to a pipeline or orifice in which the closure member is either rotated or moved transversely or longitudinally in the waterway so as to control or stop the flow.

Weir – A low dam or wall built across a stream to raise the upstream water level. Termed fixed-crest weir when uncontrolled. A structure built across a stream or channel for the purpose of measuring flow. Sometimes described as a measuring weir or gauging weir. Types of weirs include: broad-crested weirs, sharp-crested weirs, ogee weirs, and V-notched weirs.


Appendix D

Appproval of the EAP


The signature below indicates my agency’s approval and acceptance of the Emergency Action Plan (EAP). By signing this form, I am acknowledging that my agency understands its role and responsibilities as identified in the EAP.

Agency: Ohio Department of Natural Resources, Division of Soil and Water Resources, Dam Safety Engineering Program

Address: 2045 Morse Road, Building B-1, Columbus, OH 43229

Phone: (614) 265-6731 or (614) 799-9538 (24-hour number)

Fax: (614) 447-9503

Name: ____________________________________ (Authorized Representative) (print or type)

Signature: ____________________________________

Date: ____________________________

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