US Army Corps of Engineers
Chicago District

Controls

The GLMRIS Team has completed the Aquatic Nuisance Species (ANS) Control Paper: Inventory of Available Controls for Aquatic Nuisance Species of Concern – Chicago Area Waterway System.

The purpose of the ANS Control Paper is to identify the range of options or technologies available to prevent the transfer of ANS of Concern-CAWS. Each selected Control was identified as one that is potentially effective at preventing the transfer of the ANS of Concern-CAWS via aquatic pathways. These organisms were previously identified as non-native species to be the initial focus of GLMRIS. The ANS Control Paper does not contain specific recommendations, rank the effectiveness of the Controls, or identify constraints, impacts, regulatory requirements or technological feasibility of control application.

Controls include those that modify flow within a waterway, such as hydrologic separation of the basins, those that modify the water quality of a waterway, collection and removal of ANS from a waterway, chemical application to ANS, as well as other types of Controls currently in research and development.

ANS Control Screening

In the Aquatic Nuisance Species of Concern White Paper, the U.S. Army Corps of Engineers (USACE), in collaboration with our stakeholders, identified ANS of Concern and their corresponding organism types. These ANS of Concern and organism types were the initial focus of GLMRIS for the Chicago Area Waterway (CAWS). In the Inventory of Available Controls for Aquatic Nuisance Species of Concern – Chicago Area Waterway System (ANS Control Paper), USACE identified over 90 options and technologies available to prevent the transfer of these ANS of Concern-CAWS. In December 2010, USACE posted the original draft of this document for public comment. The comments on the ANS Control Paper are available for viewing.

As a part the ongoing analysis, USACE, in collaboration with federal, state and local governmental agencies, refined the organism types warranting further consideration by GLMRIS to include fish, algae, crustaceans, and plants. Using the information provided in the ANS Control Paper, USACE identified which of the 90+ ANS Controls may be effective at preventing transfer through an aquatic pathway for these organism types in all life stages.

Through a screening and review process, USACE and governmental agencies and organizations refined the ANS Controls for fish, algae, crustaceans and plants. "Industrial biocides" that were not used commonly for conventional municipal drinking water or wastewater treatment were removed from further consideration. "Freezing," "Desiccation," "Hot Water Thermal Barrier" in the "Lethal Water Temperature" fact sheet and the ANS Controls identified in the "Benthic Barrier" fact sheet were also removed because all were deemed to be impracticable for continued effective application. USACE removed Rotenone Oral Delivery Platforms from further consideration because fish can smell the rotenone and therefore, the smell reduces the effectiveness. Researchers are now focusing on Antimycin A Oral Delivery Platforms. The Piscicides fact sheet has been updated. The remaining ANS Controls that may be effective at preventing the transfer through an aquatic pathway of algae, crustaceans, fish and plants in all life stages are presented below.

ANS Control Screening

Through the study process, the GLMRIS Team has screened controls inventoried in the ANS Control Paper. The team determined certain ANS Controls do not warrant additional consideration and have eliminated them from further study. USACE requested comments from public stakeholders regarding the ANS Controls Screening from January 18 through February 21, 2013. More information on the screening can be found on the ANS Control Screening page.

ANS Control Comment Period

USACE solicited comments on the ANS Control Paper during a period that ran from December 21, 2011 through February 17, 2012. The purpose of the comment period was to allow GLMRIS Stakeholders to provide additional information on ANS Controls that may be effective at preventing the transfer of ANS of Concern - CAWS or provide comments or clarifications regarding ANS Controls identified in the paper. The ANS Control Paper has been updated based on comments received during this period. View the comments on the paper.

Using the information contained in the paper, USACE will develop screening criteria consistent with study objectives and refine the list of Controls to determine which warrant further consideration. USACE will formulate plans comprised of one or more of the screened Controls in consideration of four criteria: completeness, effectiveness, efficiency and acceptability. USACE will then evaluate and compare the effects of the alternative plans.