Dam Report August 2006

The primary purpose of the Dam Leak Committee is to monitor the leak. Of greatest importance is to ensure that there is no degradation of our earthen dam caused by the leak. Of secondary importance is to measure the flow rate of the leak. In this way we can determine how much water loss is due to the leak. At this point there is no plan to slow or stop the leak. Any action in that direction will depend upon the committee's findings and the LTPOA board's wishes.

To accomplish our goals the committee has identified three tasks:

1) Monthly monitoring of the leak for temperature, turbidity, flow rate, and visual characteristics, odor, etc. _ Rich Hirsch, Ken Jost

2) Weir installation to measure the water loss _ Mike Leiweke, Kevin Seelbach

3) History of the dam as regards the leak — Clarue Holland, Rick Lippitt

The Dam Leak Cmte met on Sat. July 22 at 10am at the dam. The cmte first visited the leak pool at the toe of the dam. There was a strong odor of hydrogen sulfide (H2S) coming from the pool. The H2S is probably due to incomplete decomposition (oxidation) of organic material (leaves/branches) from the source of the leak in the lake. The temperature of the leak pool was 52 deg F. A sample of the leak pool water was perfectly clear (water white) with no turbidity. (Turbidity would be a cause for much concern as it would indicate earthen dam erosion.)

The temperature of 52 deg F indicates that the leak is at approximately 33 feet. (On July 21 at 9am Janet and I produced a graph of lake depth vs. temperature. Dave Taylor of Stratus Engineering indicated that while this does not tell us where the leak is, it does tell us how deep the leak is.)

The committee will meet again on Tuesday August 22 at 7pm in the Sales Office.

For the committee — Rich Hirsch