Page 1 of 7

TVA - River Operations - Project Scope

Year: FY2014 Project #: O3H068

Prepared: 05/16/2014

Facilities: Ocoee 3 Hydro (O3H) & Olympic Whitewater Center (WWC) Objective: Improve Tailwater Warning System Reliability 1.) Component: The components involved in this project are associated with the TVA Tailwater Warning System located at the U.S. Forrest Service WWC Facility on the upper end of the Ocoee River. The equipment at WWC consists of PLC Comm equipment in the basement of the visitor’s center, 7 warning light poles along the visitor center riverbank, and audible warning equipment along the riverbank. Other PLC Comm equipment at Ocoee 3 Dam (1.5 miles upstream of the WWC), PLC Comm equipment at Ocoee 3 Powerhouse (1.5 miles downstream of the WWC), and the associated communications lines between the 3 facilities are all part of the overall warning system. The signal for a warning system operation is first initiated at the Ocoee 3 Powerhouse, travels to the Ocoee 3 Dam, then ending at the WWC. 2.) Background/Problem: The purpose of the Tailwater Warning System is to provide a visual and audible “warning” to the general public before any operational change is performed that will release water downstream to the WWC from Ocoee 3 Dam. Due to the popularity and public’s heavy use of the WWC facility, it’s important that this system is operating reliably to allow users to exit the river channel prior to rising water levels. The current communication cables between all 3 facilities are telephone lines. Over the past couple years, several mis-communications have been experienced over these lines – resulting in improper operation of the warning system. It has been determined that the telephone cables and associated modems have become unreliable. Additionally, the need for a redundant communication path between facilities, a backup power supply for the WWC basement Comm Equipment, and repairs to warning system light poles have all been identified.

Page 2 of 7 3.) Scope of Work: This project intends to correct the following issues with the system:

1) New Hard Wire Communication Path Installed (Fiber Optic), 2) Redundant Communication Path Installed (Data Radio), 3) UPS Battery Backup Installed in WWC (Un-interruptible Power Supply), 4) New swivel Light Poles for safe bulb changes by personnel (all locations).

Scope Item Details:

1) New Hard Wire Communication Path Installed (Fiber Optic)

a) Plan: The proposed plan for installing a new hard wired communication path is to run a new direct-buried fiber optic cable from the Ocoee 3 Powerhouse Switchyard, upstream 1.5 miles to the WWC (eliminating the current loop to the Ocoee 3 Dam for warning system signals). The fiber optic cable would be installed along the Forrest Service Rhododendron Trail (Refer to Attachment 1 – Trail Topo Map) on the south side of the river (opposite from the highway). A ditch would be dug in the middle of the gravel trail, new cable placed at bottom, filled back in, then finished with a new layer of gravel to restore the trail to as-found condition, or better. The cable would be run along existing man-made areas, and no vegetation disturbed. Once the downstream parking lot of the WWC facility is reached, the cable would enter the first accessible “pull box” to run in existing conduit paths to the upstream walking bridge. The cable would then cross under the bridge in existing conduits, pulling into the basement of the WWC.

b) Construction: The ditch would be roughly 6” to 8” deep, excavated with a piece of

ditching equipment where feasible, and by hand in other areas. All digging would be confined to inside the gravel trail width.

The digging a cable installation will take place in 7 Sections to allow for incremental disturbance to the trail, ease of cable runs, and future maintenance troubleshooting if 1 section goes bad. Here are the sections: (Refer to Attachment 2 – Fiber Run Drawing Sketch)

i. O3H SWYD – Bridge #1 ii. Bridge #1 – Bridge #2 iii. Bridge #2 – Bridge #3 iv. Bridge #3 – Bridge #4 v. Bridge #4 – Trailhead vi. Trailhead – Pull Box 17 (enters existing conduits to WWC)

Page 3 of 7

At each Bridge, hidden conduits and termination pull boxes will be placed underneath to continue the cable run and connect sections.

Temporary erosion control “socks” will be placed on the riverside of the gravel trail along the digging section, as well as around bridges and stream edges. These will move along with the crew and only be removed after trail section is fully restored with gravel.

Work Schedule is planned for 4 days per week (Mon – Thurs) to allow for public use of the trail on weekends. Sections will be completed in 1 week increments as much as possible to limit the impact to users. Equipment will be removed and proper barriers put in place in the event of an un-completed section at week’s end. Work will be done in daylight hours.

Gravel piles will be staged at both ends of the trail (there are existing piles at both ends of the trailheads now).

The Trail surface will be finished to the Standards set in U.S. Forrest Service TMO. (Refer to Attachment 3 – TMO Document)

c) Testing:

Testing will be required to ensure the new system function – a Test Plan will be developed for review before Construction begins.

d) Pictures:

#1 – Sample of Trail

Buried Fiber Optic Cable

Page 4 of 7

#2 – Sample of Bridge

#3 – WWC Junction Box in Parking Lot

Fiber Optic Cable in gray conduit – hidden

under bridge. Junction Box placed

under bridge.

Cable enters here from Trail – continues to WWC via existing

facility conduits

Page 5 of 7 2) Redundant Communication Path Installed (Data Radio)

a) Plan:

The proposed plan is to purchase radio communications equipment that will operate via a repeater station from Ocoee 3 Powerhouse to the WWC. This path will serve as a “backup” to the primary fiber optic hard line.

b) Construction: Radio equipment will be installed at Ocoee 3 Powerhouse Repeater installed on Bean Mountain Location (or other) Radio antenna installed in basement of WWC Small equipment that will not require much involvement

c) Testing:

Testing will be required to ensure the new system function – a Test Plan will be developed for review before Construction begins.

3) UPS Battery Backup Installed in WWC (Un-interruptible Power Supply)

a) Plan:

Battery backup equipment will be purchased for installation in the basement of WWC, next to all of the existing Tailwater Warning equipment cabinets. In the event that the WWC loses building power, the warning system will still be operable for 24 – 48 Hours (until service can be restored or personnel notified).

b) Construction: Equipment installed at WWC. Small equipment that will not require much involvement

c) Testing:

Testing will be required to ensure the new system function – a Test Plan will be developed for review before Construction begins.

4) New Swivel Light Poles for safe bulb changes by personnel (all locations)

a) Plan:

Newly designed tailwater warning light poles will be installed at the existing 7 locations by the WWC riverbank (between the upstream and downstream walking bridges). The poles will be made of Core-10 Steel (natural rust coat) to match the current poles in place. These poles will

Page 6 of 7

have the ability to swivel the light bulbs to the ground for easy bulb change. This will eliminate the need for personnel to use a ladder on un-even rocky ground, making this a much safer task.

b) Construction: Equipment installed at WWC. Small equipment that will not require much involvement

c) Testing:

Testing will be required to ensure the new system function – a Test Plan will be developed for review before Construction begins.

4.) Schedule: This project must be completed before the end of FY2014 (September 30, 2014).

1) New Hard Wire Communication Path Installed (Fiber Optic) August 1, 2014 – September 30, 2014

2) Redundant Communication Path Installed (Data Radio) June 15, 2014 – June 30, 2014

3) UPS Battery Backup Installed in WWC (Un-interruptible Power Supply) August 1, 2014 – August 10, 2014

4) New swivel Light Poles for safe bulb changes by personnel (all locations) June 15, 2014 – June 30, 2014

5.) Request to U.S. Forrest Service: Please review this package and provide comments. TVA will perform any required Environmental & Cultural Reviews (to the Forrest Service Standards) necessary to complete this project by September 30, 2014. We look forward to working together to make this a win-win success for both agencies. 6.) ** List of Attachments (below)**

1) Attachment 1 – Trail Topo Map 2) Attachment 2 – Fiber Run Drawing Sketch 3) Attachment 3 – TMO Document

Page 7 of 7 7.) Acceptance Signatures of Proposed Scope Package: The signatures certify that each party has read, discussed, and fully understands the proposed scope of work in this package: Forrest Service Ranger: (Sign)________________________ (Date)_________ TVA Plant Manager: (Sign)________________________ (Date)_________ TVA Project Manager: (Sign)________________________ (Date)_________ Constructor: (Sign)________________________ (Date)_________

Rhod

oden

dron

Trail

Ocoe

e Ran

ger D

istric

tCh

eroke

e Nati

onal

Fores

t05

/2014 ±

00.2

50.5

0.125

Miles