Page 6 of the PAERAB's Spring 2011 Community Update Newsletter

that included a revised explosives safety submittal to address the changes in the detonation process. Investigation was performed at Tilcon on the following days: February 28, March 1, March 2, March 3, and March 4. The final field investigation was performed on March 4^th. On that day four MEC objects that had been uncovered on March 2^nd were detonated as follows: an MK20 6 inch shell, a 6-inchlow ordered (as described in the daily report), and two MK10 fuzes. The MEC items were detonated without incident in accordance with the new protocol.

Text Box: were remobilizing for the effort. The work had been abruptly suspended in the spring of 2010 when detonation of MEC resulted in fragments being discharged offsite to a residential area. The Army determined that some of

Text Box: Regulators and PAERAB representatives were notified on February 23, 2011 that the most recent Time Critical Removal Action (TCRA) for Tilcon, known as Tilcon 3, was resuming; Baltimore District Army Corps contractors

Text Box: the MEC that originated from the 1926 explosion was too large and accordingly too powerful to be detonated by the standard procedures that had been employed up to that time at the arsenal. A work plan addendum was prepared

Picture of Munitions Debris discovered at Tilcon 3 on March 2, 2011

Munitions debris found at Tilcon 3 on March 2, 2011.

Picture of Munitions Debris discovered at Tilcon 3 on February 28, 2011

Munitions debris found at Tilcon 3 on February 28, 2011.