In 2021, HGL completed an AGC-based RI, TCRA, and RD for the former Camp Breckinridge. The RI characterized the 20,000-acre Range Complex #1, the TCRA cleared a 35-acre target area between crop rotations, and the RD provided high-definition delineation of target of interest-laden areas.
RI – The area was initially characterized during the RI using over 200 miles of DGM density transects spaced to detect 37mm projectile and MKII hand grenade target areas. Locations for high-density area/high-use area (HUA) grids for dynamic and cued MM2x2 data collection were selected based on anomaly densities along the transects. Over 4,000 anomalies were selected for follow-on AGC cueing, and over 1,600 anomalies were subsequently selected for intrusive investigation. Thirty munitions and explosives of concern (MEC) items were removed and disposed of during the RI fieldwork.
TCRA – The project team expanded the investigation to enhance landowner safety when a 35-acre HUA containing MEC was identified during the RI. Between crop rotations, HGL rapidly mobilized 25 personnel to the site to conduct a TCRA anomaly reduction effort over the area, removing over 1,500 MEC items and approximately 35,000 lbs. of munitions debris. The anomaly reduction effort included dynamic AGC surveys using the MM2x2 before and after the removal action. The higher resolution dynamic AGC surveys returned an anomaly density that was 10 times greater than that calculated from the initial DGM transects survey.
RD – To better delineate similar HUA areas for the RD, HGL collect dynamic AGC data with an UltraTEM Classifier single pass array. Six HUAs were surveyed to refine their boundaries and to determine where anomaly reduction would be needed for future RAs. HGL collected data from over 35 miles (30 acres) of transects and from 11 acres of 30-foot-wide boundary delineation-focused grids using the UltraTEM Classifier.