The results of those tests will be evaluated by DNR as part of its procedure for assuring that oil field waste is disposed of in a safe manner. Emergency rules for testing for toxic constituents in oil and gas wastes are in effect while permanent rules are being developed. Intensive air monitoring began in Grand Bois in July, 1997. To date, over 20,000 tests have been conducted on over 7,300 air samples. Continuously operating monitors sample the air 24 hours a day, seven days a week for hydrogen sulphide and hydrocarbons.
Meteorological data is collected to help assess possible sources of the pollutants being measured.
Air Quality Program uses state and federally established air quality standards to assess the degree of pollution in the air. These standards are health-based standards with levels set to be protective of human health with an adequate margin of safety. To date, all air pollutants measured in Grand Bois are below the standards. Pollutant levels are also below the average reading that the DEQ measures statewide. Two continuous air monitors are located in Grand Bois as a part of the state's ongoing investigations in the area.