The First Post-Treatment Water Tests

Click for larger map

As required by our permit, 24 hours after the completion of the herbicide application we sampled the lakewater in eight locations around the lake and another downstream at the confluence of the outlet stream with the Ompompanoosuc River.  The locations were determined by the State, in consultation with Lycott Environmental. The water samples will be shipped to the SePRO lab for testing to determine the level of triclopyr in each.

The results of this test, and of others to come, will be used by the State to determine when the restrictions on our lake can be lifted.  The lake will be open for swimming, boating, and fishing tomorrow (Friday June 4th) but lake water may not be used for drinking and food preparation until the concentration of triclopyr is below 75 parts per billion.  (Does anybody really still drink from the lake?)  The results of this first test will be available next week, and will be published here.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Four members of the Lake Association learned how to collect the samples properly.

Will explains the testing protocols

The water to be tested has to be collected from near the bottom of the lake, where the concentrations are highest.  At each of the sampling locations shown on the map the depth is indicated.  We learned how to get samples from the bottom four feet of water.

Skip lowers the Van Doren collector

Lycott provided a mechanical contrivance called a Van Doren collector to help in this task.  Sort of like a watertight animal trap, it can bring up a clean, uncontaminated sample from any predetermined depth.

Ridge retrieves a sample

The next sampling date will be determined after we receive the results of this first test.  Stay tuned.