On August 11, 2011, the U.S. Department of Energy (DOE) provided a planned change notification to begin preparatory activities related to the Salt Disposal Investigations (SDI) project at the WIPP. Complete details of the SDI planned change notification (technical presentations, comments and correspondence) are available below.

• Letter from DOE to EPA notifying EPA of Revisions to the Salt Disposal Investigations Testing Concepts (PDF)(2 pp, 346 K, June 20, 2012)
  This letter provides notice to EPA that DOE has developed an additional component, and possible alternative to the SDI project.
• Enclosure from a DOE letter to EPA dated 6/20/12 - A Conceptual Plan for Salt Defense Disposal Investigations for the Disposal of DOE-EM Managed Wastes (PDF)(61 pp, 3 MB, June 20, 2012)
  This document provides an overview of the SDI project.
• Letter to EPA from DOE notifying EPA of the intent to begin the salt disposal investigations (PDF)(3 pp, 325 K, August 11, 2011)
  This letter shares that DOE has begun preparatory activities for salt disposal investigations (SDI) project.
• Enclosure to letter to EPA dated 8/11/11 - Supporting documents for the Planned Change Notice related to Salt Disposal Investigations (PDF)(191 pp, 12 MB, August 11, 2011)
  This enclosure was included in an 8/11/11 correspondence to EPA related to a planned change notice for salt disposal investigations.
• Salt Disposal Investigations Overview (PDF)(31 pp, 3 MB, August 23, 2011)
  This presentation is an overview of DOE's Salt Disposal Investigation activities.
• EPA's SDI Comments - Repository Footprint and Experiment Room Dimensions (PDF)(1 pg, 45 K, October 2011)
  This document compiles EPA comments related to DOE's Salt Disposal Investigations.
• EPA's Comments on SDI Features, Events, and Processes (PDF)(1 pg, 39 K, October 2011)
  This document compiles EPA comments related to DOE's Salt Disposal Investigations, specifically FEP issues.
• DOE's SDI Response - DOE Presentation: Isolation of Waste from Non-Waste Regions in the SDI WIPP Configuration (PDF)(12 pp, 346 K, October 31, 2011)
  This presentation share's DOE's FEPs analysis as part of the salt disposal investigations (SDI) impact assessment.
• DOE's SDI Response - Discussion of Predicted Long-Term Heat Conduction due to Proposed SDI Tests at WIPP (PDF)(15 pp, 1 MB, November 1, 2011)
  This document share's DOE's results of the AP-156 analysis report.
• DOE's SDI Response - Effects of Connectively Transported Heat (PDF)(3 pp, 586 K, November 4, 2011)
  This document provides information on the expected effects of convectively transported heat from the planned SDI heater tests on the lower portion of the WIPP exhaust shaft.
• Letter from EPA to DOE in response to an DOE letter dated 8/11/11 related to DOE's notice to begin the SDI project (PDF)(2 pp, 412 K, November 17, 2011)
  This letter is in response to a letter dated 8/11/11 from the EPA regarding the planned change notice sent to DOE.