Justification for Class 3 Permit Modification, Corrective Action Complete with Controls, Solid Waste Management Unit 76, Mixed Waste Landfill, Sandia National Laboratories/New Mexico, EPA ID Number NM5890110518 Volumes I through VIII

The Department of Energy/National Nuclear Security Administration (DOE) and Sandia Corporation (Sandia) are submitting a request for a Class 3 Modification to Module IV of Hazardous Waste Permit NM5890110518-1 (the Permit). DOE and Sandia are requesting that the New Mexico Environment Department (NMED) designate solid waste management unit (SWMU) 76 as approved for Corrective Action Complete status. NMED made a preliminary determination in October 2014 that corrective action is complete at this SWMU. SWMU 76, known as the Mixed Waste Landfill (MWL), is a 2.6-acre site at Sandia National Laboratories, located on Kirtland Air Force Base immediately southeast of Albuquerque, New Mexico. Radioactive wastes and mixed wastes (radioactive wastes that are also hazardous wastes) were disposed of in the MWL from March 1959 through December 1988. The meximum depth of burial is approximately 25 feet below the ground surface. Groundwater occurs approximately 500 feet below the ground surface at the MWL. DOE and Sandia have implemented corrective measures at SWMU 76 in accordance with the requirements of the Permit; an April 2004 Compliance Order on Consent between NMED, DOE, and Sandia; and the plans approved by NMED. On January 8, 2014, NMED approved a long-term monitoring and maintenance plan (LTMMP) for SWMU 76. DOE and Sandia have implemented the approved LTMMP, maintaining the controls established through the corrective measures. The permit modification request consists of a letter with two enclosures: 1. A brief history or corrective action at SWMU 76 2. An index of the supporting documents that comprise the justification for the permit modification request. The supporting documents are included in an 8-volume set: Justification for Class 3 Permit Modification for Corrective Action Complete With Controls, Solid Waste Management Unit 76, Mixed Waste Landfill. Volume/pages: I/858. II/420. III/556. IV/1128. V/848. VI/1110. VII/914. VIII/866

Justification for Class III Permit Modification January 2008 SWMU 28-2 Operable Unit 1332 Mine Shaft

This technical document contains the Justification for the Class III Permit Modification request for Site 28-2. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification July 2004 DSS Site 1033 Operable Unit 1295 Building 6631 Septic System (TA -III)

This technical document contains the Justification for the Class III Permit Modification request for Site 1033. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of the site

Justification for Class III Permit Modification April2001 SWMU81D Operable Unit 1333 Northern Cable Area

This technical document contains the Justification for the Class III Permit Modification request for Site 81D. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification September 2005 DSS Site 1004 Operable Unit 1295 Building 6969 Septic System

This technical document contains the Statement of Basis for the Class III Permit Modification request for Site 1004. Terminology changed to Justification for permit modifications after the submittal of this and the other documents included in this submittal. As with Justification Binders, contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification April 2000 Solid Waste Management Unit 88B Operable Unit 1334 Round 9

This technical document contains the Statement of Basis for the Class III Permit Modification request for Site 88B. Terminology changed to Justification for permit modifications after the submittal of this and the other documents included in this submittal. As with Justification Binders, contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification April 2000, ER Site 57A, Workman Site: Firing Site, Operable Unit 1334

This technical document contains the Justification for the Class III Permit Modification request for Site 57A. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification April 2000, ER Site 65C, Secondary Detonation Area, Lurance Canyon Explosive Test Site, Operable Unit 1333

This technical document contains the Justification for the Class III Permit Modification request for Site 65C. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site

Justification for Class III Permit Modification March 2005, DSS Site 1029, Operable Unit 1295 Building 6584 North Septic System at Technical Area III

This technical document contains the Justification for the Class III Permit Modification request for Site 1029. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of the site

Justification for Class III Permit Modification September 2005, SWMU 152, au 1295 Building 9950 Septic System, Coyote Test Field

This technical document contains the Justification for the Class III Permit Modification request for Site 152. Contained within this document is the history of the site, descriptions of any investigations and/or remediation completed at the site, the regulatory background, and the rationale for the proposed future land-use of this site