Off-post sampling at Twin Cities AAP

[Lenny Siegel <lsiegel@cpeo.org>]

This reply came from Mel Smyre <msmyre@primenet.com>.

The Twin Cities Army Ammunition Plant (Arden Hills, Minnesota) does
considerable off-site sampling, in large part because of TCE
contamination of deep and shallow aquifers.  The deep aquifer plume
extends about 6 miles form the base and is currently used, after carbon
filtration, as a water sources for 3 communities. This system requires
continual monitoring.  

In addition, a small off-site lake, Round Lake, was contaminated with
metals from plant waste runoff.  The lake, now controlled by U.S. Fish
and Wildlife as a refuge, is currently the subject of a Tier 2 eco-risk
assessment. Sampling has taken place at the lake, which is nearby but
not adjacent to the Ammunition Plant.