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FINAL THIRD FIVE-YEAR REVIEW REPORT FORMER NEBRASKA ORDNANCE PLANT OPERABLE UNIT NO. 2 (GROUNDWATER) MEAD, NEBRASKA
U.S. Army Corps of Engineers, 56 pp, 2019

The remedy performance at the former Nebraska Ordnance Plant Operable Unit 2 was evaluated in this five year review which spanned from 2013-2017. Since 2013, groundwater contaminated with RDX at the site has been treated at the wellhead with ultraviolet (UV) photolysis systems. The UV systems on four extraction wells and two focused extraction wells (FEW) treat RDX with a removal efficiency of 71-99%. A total of 36 lbs RDX were removed. The wellhead systems allowed the main GTP to shut down in 2014 resulting in an annual savings of 120,000 lbs of carbon. Groundwater at one UV-equipped FEW is also contaminated with TCE which is treated at the advanced oxidative process (AOP) groundwater treatment plant using a HiPOx™ reactor. The reactor removed 14,000 lbs of TCE by chemically oxidizing 1.1 billion gals of water through a mixture of hydrogen peroxide and ozone. A groundwater extraction well pumping and reinjecting groundwater at 20 gpm aids in TCE removal. Treated water is beneficially reused or discharged to onsite creeks. https://usace.contentdm.oclc.org/utils/getfile/collection/p16021coll7/id/11729 [Note it may be necessary to copy and paste the URL] More information: https://www.nwk.usace.army.mil/Missions/Environmental/Environmental-Projects/NOP/



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