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Kingston Ash Slide

Characterization of Dredged Ash
For Disposal at the Arrowhead Landfill

Background

  • Arrowhead Landfill is a Resource Conservation and Recovery Act (RCRA) Subtitle D permitted solid waste facility.  Subtitle D facilities are not permitted to receive hazardous wastes as defined under RCRA. Therefore, the principal waste acceptance criterion (WAC) that must be met for disposal in the landfill is demonstration that the ash does not have any constituents that exceed the RCRA definition of hazardous waste. 
  • The presence of trace metals in ash, which occur naturally in the coal and remain after the coal is burned, is evaluated by chemical tests specified by the RCRA regulation. The test required by RCRA regulation is the Toxicity Characteristics Leaching Procedure, or TCLP. TCLP testing is performed on solid waste to determine if it might also be a hazardous waste as defined under RCRA.
  • The TCLP test simulates landfill conditions to determine if a solid waste might release hazardous constituents in liquid leachates above prescribed concentrations.
  • The RCRA TCLP metals and the defining regulatory limits are summarized below:

Constituent

Regulatory Limit, mg/L

Arsenic

5.0

Barium

100.0

Cadmium

1.0

Chromium

5.0

Lead

5.0

Mercury

0.2

Selenium

1.0

Silver

5.0

  • In addition to the RCRA TCLP metals, the ash is also tested for the presence of radium-228 and radium-226, two naturally-occurring, radioactive isotopes typically found in ash. The landfill has an agreement with the state of Alabama to limit the combined concentrations of radium-228 and radium-226 to 10 picocuries (pCi) per gram of ash.
  • Another WAC is that free liquids cannot be present in the ash. The ash is tested by a variety of methods as it is loaded, including the paint filter test. A small quantity of ash is placed in a common paint filter, and must not exhibit free liquid passing through the filter within a five-minute period.

Sampling Frequency

  • As required by the landfill, TVA obtained representative samples for TCLP, radiological, and paint filter tests for the first 18 train loads of ash.
  • Based on those results, the landfill advised TVA in August 2009 that five randomly selected railcars should be sampled each month for TCLP, radiological, and paint filter tests. This sampling schedule is ongoing.

Sampling Results

  • All TCLP sample results have been less than the regulatory limit for metals.
  • All radiological results to date have been less than 10 picocuries (pCi) per gram for radium-228/226.
  • All paint filter tests have been negative for free liquids.

The specific testing results are presented below.

Metal Testing Results

Arsenic, Chromium, Lead, and Silver (PDF, 46 kb)

Barium (PDF, 44 kb)

Cadmium and Selenium (PDF, 44 kb)

Mercury (PDF, 43 kb)

Sum of Radium 226 and 228 (PDF, 45 kb)

Paint Filter Testing Results

Sample Code
Sample Date
Free Liquids
WCOMP1
04/24/2009
N
WCOMP2
04/24/2009
N
WCOMP3
06/08/2009
N
WCOMP4
06/08/2009
N
WCOMP4-Dup
06/08/2009
N
WCOMP5
06/08/2009
N
WCOMP6
06/08/2009
N
WCOMP7
06/08/2009
N
WCOMP8
06/22/2009
N
WCOMP9
06/22/2009
N
WCOMP10
06/22/2009
N
WCOMP11
06/22/2009
N
WCOMP12
06/22/2009
N
WCOMP13
06/22/2009
N
WCOMP14
06/22/2009
N
WCOMP15
06/22/2009
N
WCOMP16
06/22/2009
N
WCOMP17
06/22/2009
N
WCOMP18
06/22/2009
N
WCOMP19
06/22/2009
N
WCOMP20
06/22/2009
N
WCOMP21
06/22/2009
N
WCOMP22
06/22/2009
N
WCOMP23
06/22/2009
N
WCOMP24
06/22/2009
N
WCOMP25
06/22/2009
N
WCOMP26
06/22/2009
N
WCOMP27
06/22/2009
N
WGRAB16
06/30/2009
N
WGRAB17
06/30/2009
N
WGRAB18
06/30/2009
N
WGRAB19
06/30/2009
N
WGRAB20
06/30/2009
N
WGRAB21
07/02/2009
N
WGRAB22
07/02/2009
N
WGRAB23
07/02/2009
N
WGRAB24
07/02/2009
N
WGRAB25
07/02/2009
N
WGRAB26
07/07/2009
N
WGRAB27
07/07/2009
N
WGRAB28
07/07/2009
N
WGRAB29
07/07/2009
N
WGRAB30
07/07/2009
N
WGRAB31
07/07/2009
N
WGRAB32
07/07/2009
N
WGRAB33
07/07/2009
N
WGRAB34
07/07/2009
N
WGRAB35
07/07/2009
N
WGRAB36
07/08/2009
N
WGRAB37
07/08/2009
N
WGRAB38
07/08/2009
N
WGRAB39
07/08/2009
N
WGRAB40
07/08/2009
N
WGRAB41
07/10/2009
N
WGRAB42
07/10/2009
N
WGRAB43
07/10/2009
N
WGRAB44
07/10/2009
N
WGRAB45
07/10/2009
N
WGRAB46
07/13/2009
N
WGRAB47
07/13/2009
N
WGRAB48
07/13/2009
N
WGRAB49
07/13/2009
N
WGRAB50
07/13/2009
N
WGRAB51
07/14/2009
N
WGRAB52
07/14/2009
N
WGRAB53
07/14/2009
N
WGRAB54
07/14/2009
N
WGRAB55
07/14/2009
N
WGRAB56
07/15/2009
N
WGRAB57
07/15/2009
N
WGRAB58
07/15/2009
N
WGRAB59
07/15/2009
N
WGRAB60
07/15/2009
N
WGRAB61
07/16/2009
N
WGRAB62
07/16/2009
N
WGRAB63
07/16/2009
N
WGRAB64
07/16/2009
N
WGRAB65
07/16/2009
N
WGRAB66
07/17/2009
N
WGRAB67
07/17/2009
N
WGRAB68
07/17/2009
N
WGRAB69
07/17/2009
N
WGRAB70
07/17/2009
N
WGRAB71
07/19/2009
N
WGRAB72
07/19/2009
N
WGRAB73
07/19/2009
N
WGRAB74
07/19/2009
N
WGRAB75
07/19/2009
N
WGRAB76
07/22/2009
N
WGRAB77
07/22/2009
N
WGRAB78
07/22/2009
N
WGRAB79
07/22/2009
N
WGRAB80
07/22/2009
N
WGRAB81
07/23/2009
N
WGRAB82
07/23/2009
N
WGRAB83
07/23/2009
N
WGRAB84
07/23/2009
N
WGRAB85
07/23/2009
N
WGRAB86
07/24/2009
N
WGRAB87
07/24/2009
N
WGRAB88
07/24/2009
N
WGRAB89
07/24/2009
N
WGRAB90
07/24/2009
N
WGRAB91
07/25/2009
N
WGRAB92
07/25/2009
N
WGRAB93
07/25/2009
N
WGRAB94
07/25/2009
N
WGRAB95
07/25/2009
N
WGRAB96
07/27/2009
N
WGRAB97
07/27/2009
N
WGRAB98
07/27/2009
N
WGRAB99
07/27/2009
N
WGRAB100
07/27/2009
N
WGRAB101
07/28/2009
N
WGRAB102
07/28/2009
N
WGRAB103
07/28/2009
N
WGRAB104
07/28/2009
N
WGRAB105
07/28/2009
N
WGRAB106
07/29/2009
N
WGRAB107
07/29/2009
N
WGRAB108
07/29/2009
N
WGRAB109
07/29/2009
N
WGRAB110
07/29/2009
N
WGRAB111
07/30/2009
N
WGRAB112
07/30/2009
N
WGRAB113
07/30/2009
N
WGRAB114
07/30/2009
N
WGRAB115
07/30/2009
N
WGRAB116
07/31/2009
N
WGRAB117
07/31/2009
N
WGRAB118
07/31/2009
N
WGRAB119
07/31/2009
N
WGRAB120
07/31/2009
N
WGRAB121
08/02/2009
N
WGRAB122
08/02/2009
N
WGRAB123
08/02/2009
N
WGRAB124
08/02/2009
N
WGRAB125
08/02/2009
N
WGRAB126
08/04/2009
N
WGRAB127
08/04/2009
N
WGRAB128
08/04/2009
N
WGRAB129
08/04/2009
N
WGRAB130
08/04/2009
N
WGRAB131
08/05/2009
N
WGRAB132
08/05/2009
N
WGRAB133
08/05/2009
N
WGRAB134
08/05/2009
N
WGRAB135
08/05/2009
N
WGRAB136
08/27/2009
N
WGRAB137
08/27/2009
N
WGRAB138
08/27/2009
N
WGRAB139
08/27/2009
N
WGRAB140
08/27/2009
N
WGRAB146
10/22/2009
N
WGRAB147
10/22/2009
N
WGRAB148
10/22/2009
N
WGRAB149
10/22/2009
N
WGRAB150
10/22/2009
N
WGRAB151
11/19/2009
N
WGRAB152
11/19/2009
N
WGRAB153
11/19/2009
N
WGRAB154
11/19/2009
N
WGRAB155
11/19/2009
N
WGRAB156
12/17/2009
N
WGRAB157
12/17/2009
N
WGRAB158
12/17/2009
N
WGRAB159
12/17/2009
N
WGRAB160
12/17/2009
N
WGRAB161
01/28/2010
N
WGRAB162
01/28/2010
N
WGRAB163
01/28/2010
N
WGRAB164
01/28/2010
N
WGRAB165
01/28/2010
N
WGRAB166
02/18/2010
N
WGRAB167
02/18/2010
N
WGRAB168
02/18/2010
N
WGRAB169
02/18/2010
N
WGRAB170
02/18/2010
N
WGRAB171
03/16/2010
N
WGRAB172
03/16/2010
N
WGRAB173
03/16/2010
N
WGRAB174
03/16/2010
N
WGRAB175
03/16/2010
N

 

           
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