Butte CTEC: Connecting Citizens & Their Environment
Latest News from CTEC
Take a look at the CTEC Blog for a complete listing of recent news and updates from CTEC, and refer to the In the News and Public Health News pages for links to the latest media stories related to Superfund and environmental cleanup in Butte and western Montana. Opportunities for public involvement and additional info can be found on our Events Calendar.
The Record of Decision (ROD) for the Butte Mine-Flooding Operable Unit was signed September 29, 1994.
The Butte Mine-Flooding Operable Unit (OU) is one of four OUs within the Butte Mining district (BMD) and consists of approximately 23 square miles. The OU is divided into two systems: 1) East Camp/Berkeley Pit, and 2) West Camp. Other OUs in the BMD are the Butte Priority Soils (BPSOU), Silver Bow Creek/Streamside Tailings, and Non-Priority Soils.
Major features of the OU are 1) underground mine workings, 2) Berkeley Pit, and 3) alluvial and bedrock aquifers contributing flow to the system.
DEQ Press Release: DEQ Approves the Enhanced Bioremediation Plan for the Bozeman Solvent Site CleanupJanuary 22, 2014
Helena – The Montana Department of Environmental Quality (DEQ) recently approved the “Enhanced Bioremediation 100% Design Report” for the Bozeman Solvent Site in Bozeman, Mont. The city of Bozeman and CVS Pharmacy will begin implementing this phase of the cleanup next month.
Enhanced bioremediation was one of the cleanup methods selected in the August 2011 Record of Decision (ROD). It will address the tetrachloroethene (PCE) contamination at the Hastings Shopping Center.
Enhanced bioremediation works by injecting an organic compound into the groundwater, which then stimulates the growth of microorganisms. These microorganisms break down the contamination in the soils and groundwater until DEQ’s site-specific cleanup levels are met.
“Since the Record of Decision was implemented, DEQ, CVS Pharmacy and the city of Bozeman have worked closely and have made great progress, “says DEQ Director Tracy Stone-Manning. “This part of the cleanup is huge in protecting human health and the environment and we are excited to begin this phase.”
Several monitoring wells are in place to measure the reduction of PCE in the groundwater. DEQ expects that groundwater cleanup levels of five parts per billion (ppb) will be met within five years of using this cleanup method.
Several parts of the ROD have already been implemented. In 2012, the city of Bozeman put a permit system in place that requires an air ventilation system in trenches and excavations at the Hastings Shopping Center that protects workers in those trenches and excavations from inhaling PCE contaminated vapors. The city of Bozeman also developed a procedure for providing clean drinking water to residents and businesses that have groundwater drinking wells impacted with PCE concentrations greater than five ppb. In 2013, land use restrictions were put in place for portions of the Hastings Shopping Center to prohibit residential development and construction of structures that could interfere with cleanup. The Controlled Groundwater Area Order limits the installation of new groundwater wells, and remains in place to limit the movement of contamination.
The city of Bozeman and CVS Pharmacy will continue to monitor the groundwater to make sure that the cleanup actions are working.
For more information regarding the Bozeman Solvent Site, please contact Kate Fry at 406-841-5066 or at firstname.lastname@example.org or visit the webpage at http://deq.mt.gov/
An enhanced bioremediation pilot test was conducted in 2008. The results of the pilot test demonstrated that PCE concentrations at the Hastings Shopping Center were reduced. Pilot test monitoring also showed that methane and vinyl chloride were generated in soil vapor and vinyl chloride in the groundwater. Methane and vinyl chloride are common byproducts of enhanced bioremediation and can be used to demonstrate that the organic compound is working. The enhanced bioremediation design includes a soil vapor monitoring network and installation of a soil vapor extraction system to capture and treat methane and vinyl chloride soil vapors. The treated vapors will be discharged to the atmosphere.
The city of Bozeman and CVS Pharmacy are currently working on the design documents for the sub-slab vapor extraction system that will be installed beneath a portion of the Hastings Shopping Center building. The system is to remove and treat sub-slab vapors from the building before PCE contaminated vapors can move into indoor air. This system is expected to be put into place by the summer of 2014.
What is CTEC?
Welcome to buttectec.org, established and maintained by the Citizens Technical Environmental Committee (CTEC) of Butte, Montana to serve as a public resource for information and scientific data about Butte and Silver Bow Creek area Superfund sites, as well as associated environmental issues and sites related to historic mining and smelting.
The goal of this site, as with all of CTEC’s efforts, is to help citizens develop informed questions and become involved in the decision-making process for the ongoing cleanup of mine wastes and related environmental damages in the area.
Environmental cleanup efforts in the area are monumental – it is estimated that over one billion dollars will be spent on reclamation and restoration across more than 120 miles of Montana’s Clark Fork Basin, from Butte to Missoula. The issues are complex, and the environmental impacts are broad – the map below will help to orient you in regards to Superfund sites in western Montana.
If, in reading over any of the information on this site, you would like to be involved in the monumental efforts to restore the environmental health of the headwaters of the Columbia River, consider leaving a comment or contact CTEC directly to learn more about how you can get involved.
Please send any written questions or comments to:
P.O. Box 593
Butte, MT 59703
Or call us at (406) 723-6247, stop by our office at 27 W. Park Street in Uptown Butte (our office hours are 1:30 pm to 5:30 pm Monday through Friday), or e-mail us at email@example.com.