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200708364 US Army USACE of Engineers Omaha District To: CENWO -PM -H, Alvin M Kam From: CENWO-ED-GI, James J. Mars 11 Subj: 5X certification for exempted areas in Load Lines 1 and 2 Ref: CORNHUSKER ARMY AMMUNITION PLANT, GRAND ISLAND, NEBRASKA ACM Removal at Load Lines 1 and 2 Contract: W9128F -04 -0001, DO-0008 Date: Wednesday, January 10'", 2007 certification for Qxempted ar in Load Lines 1 and 2: The previously exempted areas of Load Line 1 and 2 associated with possible presence of buried debris (ACM and DMM) materials are considered 5X certified with the following applicable statement "This certifies that the material listed has been 100 percent properly inspected and to the best of our knowledge and belief is free of explosive hazards, engine fluids, illuminating dials, and other visible liquid HTRW materials." as required by the DoD Explosive Safety Board. His ry: Thermal decomposition, demolition, and 5X certification for Load Lines 1 and 2, was completed by MKM Engineers, Inc. (MKM) between 2000 and 2005 with the exception of two areas in Load Line 1 and one area in Load Line 2 due to the possible presence of ACM materials which prevented excavation, investigation and verification of these areas since it was not part of their contract. During the period of June through August 2006, URS Group, Inc. (URS) of Omaha, Nebraska, under contract to Omaha District US Army Corps of Engineers (USACE), investigated and excavated these areas. The goal of the project was the removal and disposition of the ACM material and the verification that the removed material and excavated areas were free of Material Potentially Presenting an Explosive Hazard (MPPEH). Via: Total of three areas was excavated to a depth of no less then 4 feet bg. All excavated material was visually Inspected using a modified shaker process for the presences of explosives or munitions (e.g., munitions containers and packaging material; munitions debris remaining after munitions use, demilitarization, or disposal; and range - related debris); or material potentially containing a high enough concentration of explosives such that the material presents an explosive hazard (e.g., equipment, drainage systems, holding tanks, piping, or ventilation ducts that were associated with munitions production, demilitarization or disposal operations). Additionally, all material excavated and the walls and floor of the excavation was analytically sampled for the presents of Munitions Constituents (MC) in accordance with a USACE approved Sampling Plan. Al phases of the inspection and sampling was in accordance with the USACE approved Work Plan and verified by the Quality Assurance inspections by a on site USACE Ordnance and Explosive Safety Specialist. Findings: Results of the visual inspections and analytically sampling were all No Finds for Munitions and Explosives of Concern (MEC). /J; s J. Mars II WO -ED -GI Ordnance and Explosive Safety Specialist Page 6 of 6