"This report presents the results of an aerial remote sensing study carried out by the Environmental Monitoring Systems Laboratory - Las Vegas for the U. S. Department of Energy's Laramie Energy Technology Center (LETC), Laramie , Wyoming, Colorado infrared aerial photography and thermal infrared data were acquired over the LETC Tar Sands recovery field site on northwest Asphalt Ridge near Vernal, Utah. Aerial photography of the Tar Sands field site and surroundings was analyzed to determine baseline environmental conditions including significant vegetation removal, basic land cover patterns, drainage systems , roadways , and utility corridors. Detailed analysis of the field site provides identification of test zones , support buildings , holding tanks, and other Tar Sands recovery process information. Analysis of thermal infrared imagery was carried out in an attempt to detect the subsurface behavior of pressurized steam injected into the Tar Sand reservoir, and to monitor other surface expressions of thermal recovery processes. Analysis of aerial photography revealed that primary environmental disturbance associated with the Tar Sands field site consists of the removal of approximately 6.7 acres of rangeland vegetation. No liquid spillage or leakage from the processing operation was found, and no other significant on-or off- site impacts attributable to the field site were noted . No direct surface expression of subsurface steam behavior was detected by thermal infrared analysis due to the depth at which steam injection occurred . However , apparent temperature relationships of the field site support buildings , holding tanks, and ancillary equipment were established."