Facilities-Units

Document Type

Article

Publication Date

3-2023

Comments

53 pages

Abstract

The Department of Energy/National Nuclear Security Administration (DOE/NNSA) and National Technology & Engineering Solutions of Sandia (NTESS) have requested modifications to the Resource Conservation and Recovery Act Facility Operating Permit (Permit) for Sandia National Laboratories/New Mexico. The requested modifications consist of revisions to the Mixed Waste Landfill (MWL) Long-Term Monitoring and Maintenance Plan (LTMMP), which is incorporated by reference into Permit Attachment M, "Long-Term Monitoring and Maintenance Plan for Solid Waste Management Units and Areas of Concern Granted Corrective Action Complete with Controls." The MWL is also known as Solid Waste Management Unit (SWMU) 76.

Groundwater monitoring at SWMU 76 is conducted through a compliance network of four wells, as described in the LTMMP. Monitoring results are documented in annual reports that indicate the MWL cover and associated controls are performing as designed. Well MWL-MW4 was drilled and installed in late 1992/early 1993. As documented in the LTMMP, MWL-MW4 was retained for informational purposes and has been used only to obtain periodic groundwater elevation measurements to support preparation of MWL potentiometric surface maps presented in annual reports.

The DOE/NNSA and SNL/NM propose to decommission MWL-MW4 by plugging and abandoning the well in place because the well is no longer needed for compliance monitoring, is not needed for establishing the potentiometric surface of the Regional Aquifer and may potentially act as a conduit for the downward movement of soil vapor beneath the site.

This requested modification does not substantially alter the requirements of the LTMMP, and the modification will not reduce the capacity of the DOE/NNSA and NTESS to protect human health and the environment. Site conditions at SWMU 76 continue to be protective of human health and the environment.

Publisher

Sandia National Laboratories/NM

Keywords

RCRA Facility Operating Permit, LTMMP, Long-Term Monitoring and Maintenance, SWMU 76, Solid Waste Management Unit

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