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Collins, S., M.M. Mitchell, and R. Ziock.
2018 Long-Term Stewardship Conference, August 20-23, Grand Junction, Colorado. 17 slides, 2018

Summer 2018 marked the 15th anniversary of effective, compliant evapotranspiration (ET) landfill cover performance at Sandia National Laboratories (SNL). From 2003 to 2009, SNL constructed three ET covers ranging from 2.2 to 4.1 acres in Sandia's Technical Area 3 on Kirtland AFB, south of Albuquerque, New Mexico. The evaporation potential is optimal in Albuquerque due to low humidity and generally warm temperatures. The average annual precipitation in this area is 8.72 inches, with half of that accumulation occurring from intense, brief thunderstorms during the months of June through August. New Mexico Environment Department (NMED) post-closure care, long-term monitoring, and maintenance requirements call for quarterly cover inspections, any follow-on maintenance within 60 days, and annual reporting. All three SNL ET Covers meet successful revegetation permit requirements. NMED has approved all SNL annual reports. To facilitate exchange of lessons learned between cover projects, a single SNL team performs all three covers inspections. Likewise, maintenance activities are grouped under a single task order contract. All maintenance work is verified by a biologist and project lead. This presentation notes best practices and lessons learned from SNL's 15 years of experience with ET cover construction, preventive care, and maintenance.

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