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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Proposed Rules treatment system associated with the two WTP LAW Facility vitrification melters. Evaporator process condensate from the EMF, combined with WTP
LAW Facility caustic scrubber effluents, will receive treatment at the 200 Area ETF, with the resulting treated effluent disposed of at the SALDS. The waste stream transferred from WTP to the 200
Area ETF is referred to as the WTP
DFLAW effluent waste stream.

mechanism whereby Energy can operate the 200 Area ETF outside of the existing treatability envelope to gather demonstration test data to increase the treatability envelope concentration for acetonitrile to accommodate the predicted level in the WTP DFLAW
effluent waste stream.

C. Changes to 200 Area Effluent Treatment Facility Capability Through the design and permitting of the WTP complex, Energy identified several additional constituents it expected to be present in WTP DFLAW
effluent waste stream which are not typically found in wastes managed by the 200 Area ETF, or are present at levels above the current capabilities of the 200 Area ETF. Most of these additional constituents are within the existing treatment capabilities of the 200
Area ETF, and do not require special consideration. One constituent, acetonitrile, which is formed in the WTP LAW Facility vitrification melters, is predicted to be present at levels in excess of the current capability of the 200 Area ETF, as reflected in the current organic treatability envelope documented in Table C2 of the delisting petition dated November 29, 2001. Within the 200 Area ETF, the UV/
OX system treats organic compounds, including but not limited to acetonitrile.
However, acetonitrile is not easily degraded through UV/OX. Table C2 in the November 29, 2001 petition shows an electrical energy per order EE/O of magnitude destruction of 50. EE/O
reflects the relative difficulty for destruction of the organic constituent in the UV/OX unit. Constituents in Table C2 with an EE/O of 40 or higher are considered hard to treat organics. After examining various options for addressing this issue, Energy determined that the addition of supplemental organic treatment in the form of a steam stripper to the 200ETF
to separate acetonitrile from treated effluents would be the preferred approach to ensuring additional constituents associated with the WTP
DFLAW effluent waste stream can be effectively managed at the 200 Area ETF.
To accommodate the addition of the proposed steam stripper unit to the 200
Area ETF, two technical amendments are necessary to the current delisting.
First, the list of unit operations in Condition 1div of the current delisting must be amended to include steam stripping. Second, a new condition is necessary to establish a
A. Addition of Steam Stripping as a New Unit Operation In support of its request to modify the existing 200 Area ETF delisting, Energy has provided the EPA with an engineering report documenting the design and expected level of performance of the proposed steam stripper docket entries EPAR10
RCRA20210142DRAFT0003 and EPAR10RCRA20210142DRAFT
0005. These reports include both a detailed process flow diagram for, and results of process simulation of the proposed steam stripper. This information provides assurance that, if the steam stripper is added to the 200
Area ETF primary treatment train, the overall treatment system can effectively treat the expected WTP DFLAW effluent waste stream and allow for successful verification of all existing delisting criteria, including but not limited to acetonitrile. Energy must also receive authorization to construct and operate the proposed supplemental organic treatment system from the Washington State Department of Ecology through their authorized dangerous waste permitting program, as well as other applicable state permits.

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III. The EPAs Evaluation of the Proposed Technical Amendments
B. Changes to Treatability Envelope Demonstration Test Requirements The existing 200 Area ETF delisting rule includes a mechanism, documented in Condition 1b, that allows Energy to modify the 200 Area ETF treatability envelope specified in Tables C1 and C
2 of the November 29, 2001 delisting petition to reflect changes in treatment technology or operating practices upon written approval of the Regional Administrator. As stated in the rule, Data supporting modified envelopes must be based on at least four influent waste stream characterization data points and corresponding treated effluent verification sample data points for wastes managed under a particular waste processing strategy. This mechanism will be used to expand the existing treatability envelope for acetonitrile but will require operation of the 200 Area ETF outside the existing approved treatability envelope, which is otherwise not provided for in the
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delisting rule. To address this issue, the EPA is proposing to include a new condition 1c that establishes a mechanism that will allow operation outside of the approved treatability envelope for purposes of gathering demonstration test data to amend the treatability envelope at a later time.
The purpose of this new mechanism is to allow the EPA an opportunity to perform a forward-looking technical evaluation of how the 200 Area ETF will be operated during the demonstration test in order to support a finding that, to a reasonable degree of certainty, delisting exclusion limits can be satisfied during the demonstration test.
This mechanism requires Energy to provide the EPA with an engineering report and a demonstration test plan.
The engineering report must document that the 200 Area ETF can be reasonably expected to produce treated effluent during the period of interim approval which satisfies the delisting levels in Condition 5.2 The engineering report shall include, but is not limited to, engineering calculations, process modelling results, or performance data provided by equipment manufacturers.
The demonstration test plan will complement the engineering report by documenting the composition of the waste feed to be used during the demonstration test, how the demonstration test will be conducted, how demonstration test sampling and analysis will be conducted, and a schedule for conducting the demonstration test.
The EPA will review these submittals to determine whether the demonstration test will yield data suitable for establishing an expanded treatability envelope for the target constituents, and that delisting exclusion limits will be satisfied during the demonstration test.
Provided that this review demonstrates that these criteria can be met to a reasonable degree of certainty, the EPA
will provide written interim approval to Energy to proceed with the demonstration test according to the approved demonstration test plan. The effect of interim approval shall be limited to relief from the requirement of operating within the treatability envelope specified in Tables C1 and C
2 of the November 29, 2001 delisting petition, as amended, during the period of demonstration testing. Once demonstration test data are available, Energy will then submit a completion 2 In practice, the engineering report expected to be submitted in connection with a proposed demonstration treatment plan is likely to be similar, if not identical to the engineering report included in the docket supporting this proposed modification of the existing 200 Area ETF delisting.

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