Approximately 2,500 acres of the Badlands Bombing Range of the Oglala Sioux Reservation has not been returned to Tribal control. This area, referred to as the Impact Area (IA) or the Air Force Retained Area, was used as a ground artillery training range for about 15 years during the 1960s. There have been several UXO clearances, including a comprehensive Mag and Flag clearance of the entire IA in 1997 conducted by active duty EOD detachements. The 1997 Fag and Flag clearance discovered and removed one I 05-mm and three 155-mm projectiles. During the fall of 1999 the MTADS was deployed to the IA. 130 acres near the center of the IA were surveyed using the magnetometer array and the EM array was used to resurvey approximately 25 acres near the center of the magnetometer survey. Survey data were separately analyzed using different techniques to evaluate discrimination algorithms. All targets considered to be potential projectiles were dug, including 362 targets from the magnetometry survey and 109 targets from the EM survey. Fifteen HE-filled and fuzed dud projectiles were recovered and destroyed in-place, including ten 155-mm and five 8-in projectiles. The performance of the MTADS system using differing data analysis approaches is evaluated and contrasted with the Mag and Flag clearance.
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