TVA KINGSTON FOSSIL PLANT
Ball Field Interim Ash Staging Area
Closure Plan
Prepared for:
Tennessee Valley Authority
1101 Market St.
Chattanooga, TN 37402-2801
April 26, 2016
Prepared by:
1800 Perimeter Park Drive
Morrisville, NC 27560
330-836-9111
Ball Field Interim Ash Staging Area Closure Plan
TVA Kingston Fossil Plant
Table of Contents
Section
Page No.
1.
Introduction ....................................................................................................................... 1
2.
Ball Field Closure .............................................................................................................. 1
2.1. Closure Grades and Final Cover ................................................................................ 1
2.2. Storm Water Management ......................................................................................... 2
2.3. Adjoining Projects ...................................................................................................... 2
3.
Closure Schedule .............................................................................................................. 2
Attachments
Ball Field Interim Ash Staging Area Closure – Issued for Permit Drawings (April 18, 2016)
10W387-01
10W387-02
10W387-03
10W387-04
10W387-05
10W387-06
10W387-07
10W387-08
10W387-09
Title Sheet
Master Legend & Abbreviations
Existing Site Plan
Erosion & Sediment Control Plan
Top of Cover
Ball Field Cross Sections
Miscellaneous Details 1
Erosion & Sediment Control Details 1
Erosion & Sediment Control Details 2
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Ball Field Interim Ash Staging Area Closure Plan
TVA Kingston Fossil Plant
1.
INTRODUCTION
The Tennessee Valley Authority (TVA) owns and operates the Kingston Fossil Plant (KIF),
located in Roane County, Tennessee. Fly ash produced at KIF was, until recenty, temporarily
staged at the Ball Field Interim Ash Staging Area (herein, the “Ball Field”). This temporary
staging measure was performed to allow continued KIF operations while a permit modification
was implemented to allow permanent disposal of fly ash at the on-site Gypsum Disposal Area
(GDA). Having received approval for the permit modification, TVA is disposing of production fly
ash at the GDA. Fly ash from the Ball Field ash stack is currently being excavated and
transported to the GDA for permanent disposal. Following removal of staged ash, TVA will
construct final cover and revegetate the Ball Field.
This closure plan summarizes the proposed Ball Field closure design. The sections below
describe the earthwork, site grading, final cover, and storm water management elements of the
closure. Other projects adjoining the Ball Field site are discussed with respect to their
construction within the Ball Field footprint. Permit drawings are attached to this document
illustrating the closure plan and the adjoining projects. Existing site conditions are shown in
drawing 10W387-03.
2.
BALL FIELD CLOSURE
2.1.
CLOSURE GRADES AND FINAL COVER
Prior to construction of the Ball Field final cover, fly ash temporarily stacked in the Ball Field will
be removed as part of a separate project. Ash in the Ball Field footprint is expected to be
removed to approximately elevation 768’. A grading scheme for the top of final cover is shown
on drawing 10W387-05. The Ball Field will be graded with a 3% minimum slope and a 0.5%
minimum slope on the three drainage swales which will convey storm water runoff from the Ball
Field in a north-south direction. Closure grades will be obtained by grading and compacting ash
and soil materials to establish the final cover subgrade. Ash and soil materials will be obtained
from on-site borrow sources, and from regrading existing material present within the Ball Field
closure footprint. Off-site borrow will be used if needed to supplement on-site borrow sources.
Final cover for the Ball Field will be constructed above the prepared subgrade. A soil cover will
be used to close the majority of the Ball Field footprint. The following materials and
thicknesses, as listed in the order of construction (bottom to top), will be used to construct the
soil cover:

18 inches of recompacted soil liner (1x10-5 cm/sec maximum permeability); and

6 inches of topsoil.
The recompacted soil liner and topsoil will be obtained from approved off-site borrow sources.
Proposed borrow sources will be located by the contractor constructing the Ball Field Closure
improvements. Recompacted soil liner borrow material will be subject to prequalification testing
to demonstrate the soil meets the maximum permeability requirement prior to being approved
for use. Following construction of the soil cover, the Ball Field will be stabilized as shown on
drawing 10W387-04 and permanent seeding will be performed. Vegetation will be established
and maintained to provide long-term erosion control for the Ball Field cover. Establishment of
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Ball Field Interim Ash Staging Area Closure Plan
TVA Kingston Fossil Plant
vegetation will include, at a minimum, seeding, mulching, and amendment of soil with fertilizer
as required to support vegetation based upon an analysis of the topsoil borrow source.
Two projects adjoining the Ball Field which will be constructed above portions of the ash staging
area footprint are described in Section 2.3. Final cover of the Ball Field in these areas will be
incorporated into these two projects.
2.2.
STORM WATER MANAGEMENT
Storm water runoff from the closed Ball Field will be managed through existing and improved
storm water conveyances. Ditch 11, north of the Ball Field, will receive runoff from the northern
Ball Field drainage area. This ditch will be modified as part of a separate project by constructing
a scour basin and new storm water outfall to receive and discharge storm water from the Closed
Recovery Area and Ball Field. Drainage from the south and west sides of the Ball Field will be
collected in the Ball Field perimeter ditch and conveyed by new storm water piping to the
existing NPDES Outfall 007.
Storm water during construction activities will be managed in accordance with a project-specific
Storm Water Pollution Prevention Plan (SWPPP) and by the erosion and sediment controls
shown on drawings 10W387-04, 10W387-09, and 10W387-09. The SWPPP will be submitted
to TDEC for approval along with a Notice of Intent to obtain NPDES coverage for construction
storm water discharge prior to commencement of the closure project.
2.3.
ADJOINING PROJECTS
A Bottom Ash Dewatering Facility (BADWF) is currently in the planning and design stages to
treat KIF process flow. The location of the BADWF facility is shown on drawing 10W387-05.
The BADWF contains a concrete operational road and concrete pad which will be constructed
above the Ball Field footprint. The concrete pavement in these locations will serve as final
cover for the Ball Field.
A Polishing Pond will be constructed on the east side of the Ball Field as part of the KIF
Drainage and Flow Management project. The location of the Polishing Pond is shown on
drawing 10W387-05. The pond footprint will overlap the footprint of the Ball Field ash stack by
approximately 130 feet. The Polishing Pond will be lined with a linear low-density polyethylene
geomembrane liner. This liner is intended to serve as both the primary pond liner and as the
final cover liner for the overlapping portion of the Ball Field. Details concerning the proposed
Polishing Pond and pond liner system will be submitted for TDEC review and approval in an
engineering report prepared in accordance with the TDEC Design Criteria for Sewage Works.
3.
CLOSURE SCHEDULE
Removal of the fly ash temporarily staged in the Ball Field Interim Ash Staging Area is underway
and is estimated to be completed by August 2016. After the fly ash is removed, the Ball Field
footprint will be made available to the contractor selected to construct the Ball Field Closure and
Drainage and Flow Management projects. The Ball Field footprint will be used as the
designated staging and laydown area during the construction of these projects.
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Ball Field Interim Ash Staging Area Closure Plan
TVA Kingston Fossil Plant
The contractor’s construction schedule will determine when closure of the Ball Field will begin.
Initial earthwork activities (establishing and preparing the Ball Field final cover subgrade) are
expected to be performed in conjunction with construction of the adjoining Polishing Pond and
the Drainage and Flow Management project. Construction of the Ball Field soil cover is
expected to begin after the Drainage and Flow Management project is completed (estimated
completion date April 2017).
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