Here are the cumulative testing results. The most recent samples are on the right*.
|Location||Applied||June 3rd||June 9th||June 15th||June 21st||June 28th|
|Site 1||1.5 ppm||202 ppb||121 ppb||n/a||n/a||38 ppb|
|Site 2||1.5 ppm||930 ppb||127 ppb||n/a||n/a||66 ppb|
|Site 3||1.5 ppm||510 ppb||113 ppb||98 ppb||59 ppb||50 ppb|
|Site 4||2.0 ppm||85 ppb||n/a||n/a||n/a||47 ppb|
|Site 5||2.0 ppm||160 ppb||n/a||n/a||n/a||39 ppb|
|Site 6||2.0 ppm||145 ppb||n/a||n/a||n/a||42 ppb|
|Site 7||2.0 ppm||123 ppb||n/a||93 ppb||65 ppb||42 ppb|
|Site 8||2.0 ppm||332 ppb||n/a||88 ppb||n/a||40 ppb|
|Site 9||0.0||15 ppb||n/a||n/a||n/a||30 ppb|
|Site 10||0.0||n/a||n/a||31 ppb||n/a||0.0 ppb|
This is as we had expected, and it is very good news. It means that the State should remove the penultimate restriction on use of the lake, maybe as soon as tomorrow. You might recall that once all of the locations in the lake test below 75 ppb the lake water is no longer unsafe for drinking. Well, actually, we believe that it is still unsafe for drinking, but the level of residual triclopyr is now considered safe.
The presence of no triclopyr at all at site 10 might seem anomalous at first, but it bears noting that these samples were taken the morning after a long hard rain. Site 10 is on the Ompompanoosuc River well below where the lake empties into it. The river was well above its normal level, and flowing extremely fast. There was a lot of water there, and most of it had come from sources other than Lake Fairlee. It is possible that if the river been lower when we sampled some triclopyr might have been detected.
* “ppm” means “parts per million,” and “ppb” means “parts per billion.”