Apr 7, 2017

'Unknown Black Substance' Stops Excavation Behind Retaining Wall

During our efforts [along the shared property line between 4825 and 4835 Glenbrook Road] we encountered small amounts of broken glassware and an unknown solid black substance in the soil.  Samples of the solid black substance recovered this week are being sent for analysis.  The first small sample of this substance was recovered and taken for analysis toward the end of February, and the results returned this week showed a small amount of mustard and agent breakdown products within the substance.  Our air monitors did not detect any chemicals present in the air during excavation operations associated with the unknown black solid ... We will continue to follow all safety protocol as we continue to hand dig and sift through the soil behind the retaining wall.
Glenbrook Road Update
On Wednesday, during low probability operations along the shared property, the crew encountered additional amounts of the unknown black substance mixed with the soil behind the retaining wall.  The area was quickly mitigated by covering it with plastic sheeting and a layer of soil.  The team decided to perform additional sampling of the soils and materials behind the former curved retaining wall area along the shared property line.  We had a small crew come in this morning to take soil samples adjacent to the unknown black substance, plus additional samples of the unknown substance.  As safety is our priority, we have decided to shift our area of operations within the site.  We plan to resume our efforts in the backyard area of the property while awaiting the sampling results. 
Glenbrook Road Update
April 7, 2017

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