The verification test will be conducted under the U.S. Environmental Protection Agency (EPA) through the Environmental Technology Verification (ETV) Program. It will be performed by Battelle, which is managing the ETV Advanced Monitoring Systems (AMS) Center through a cooperative agreement with EPA. The scope of the AMS Center covers verification of monitoring technologies for contaminants and natural species in air, water, and soil. This verification will address sensors that provide real-time measurements of dissolved nitrate concentrations in groundwater in support of remediation activities. The day to day operations of this verification test will be coordinated and supervised by Battelle personnel, with in-kind involvement from personnel of the United States Department of Agriculture (USDA) Agricultural Research Service (ARS). Laboratory testing will be conducted at the USDA ARS National Laboratory for Agriculture and the Environment in Ames, Iowa. Field testing will be carried out by Battelle personnel and USDA ARS personnel under Battelle's oversight at the test site in Ames, Iowa.