The presence of regulated organic species in Hanford nuclear tank waste is assessed in this report, along with fate of the organics and possible evaporative treatment. A narrowed list of regulated organic species of concern is developed based upon published analyses, chemical properties like aqueous solubility, and chemical reactivity under alkaline conditions. Published analyses include tank headspace and liquid samples, review of chemical reagents formerly used at Hanford, and the Tank Waste Information Network System (TWINS). This work supports possible stabilization of Hanford Supplemental Low Activity Waste (SLAW) by grouting.Revision 1 of this report includes information on a regulatory and processing Land Disposal Restriction (LDR) treatment variance strategy termed "Sample-and-Send". The Hanford Tank Operating Contractor, Washington River Protection Solutions, LLC (WRPS) has been developing this regulatory and processing LDR treatment variance strategy that relies, in part, on demonstrating that in situ decomposition reactions along with historic evaporation of tank waste has destroyed or removed many of the LDR organics (SRNL-STI-2020-00582, SRNL-STI-2021-00453). Under the Sample-and-Send concept, Hanford tank waste would be prepared to create a feed candidate tank that would then be sampled to confirm the waste acceptance criteria is met for a supplemental LAW cementitious treatment facility.a Phthalates may be present but are excluded from this list for reasons discussed in the document SRNL-STI-2021-00453Revision 1 vii
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