The selected remedy for OU4 addresses contaminated surface water, ground water, and sediment from mine waste piles within the Study Area. The cleanup strategies will address threats through the capping or removal of waste piles and treatment of point and non-point sources of surface water contamination.
On March 31 and April 9, 1999 and again on April 18 and December 17, 2000, the monitor located in Alamosa, Colorado recorded exceedances of the 24-hour National Ambient Air Quality Standard (NAAQS) for PM10 (particulate matter having a nominal aerodynamic diameter equal to or less than 10 microns).1 Each of these exceedances was associated with high winds and blowing dust in the Alamosa area.
The "Ambient Air Pollution and Meteorological Monitoring Guidance" document explains procedures for private companies and other governmental agencies monitoring air quality and meteorology voluntarily, or to meet requirements of the Colorado Air Pollution Control Division (APCD). The document discusses how to prepare an ambient air and meteorological monitoring plan for division approval. It discusses content, format, and submittal of the plan. It explains APCD guidance regarding siting, equipment, quality assurance, and quarterly reporting of air quality and meteorological data. The document also contains a useful appendix of relevant federal air monitoring guidance.