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27 July 2000 <br /> Page 7. <br /> Dr. Howes stated they would not treat the whole pond, only that area, and <br /> they will get improvement in the system. They are going after the hot spot <br /> and the application will be done in an area that does not support animals a <br /> this time. They expect to see immediate improvement. <br /> Another issue that came up is pH. Measurements were taken in 1993. All of <br /> their data falls within this range. There is a very tight bundle of phi in the <br /> highly acceptable range, in a range around 6.5. <br /> Dr. Dave Mitchell was introduced. He is a certified lakes manager and was <br /> brought in as they move to the implementation phase. He will speak directly <br /> to the details ofthe application. <br /> Dr. Mitchell distributed .a handout concerning treatment of other lakes i <br /> New England. <br /> Mr. Sherman stated a brief discussion of the methodology would be <br /> appropriate. <br /> Dr. Mitchell will help implement monitoring when it does occur. By reducing <br /> the overall load, they are looking to not simply just make a chemical change <br /> but an improvement of water quality and clarity of the water by reducing the <br /> mount of growth in the water and to increase oxygenation of the water. <br /> Mr. Sherman stated the Commission needs to hear the methodology and hove <br /> it is going to be done. <br /> The Chair stated the Commission would like to know how and by whom, with <br /> what equipment, etc. <br /> Dr. Mitchell stated there is a species of special concern in the pond. There is <br /> also a concern in terns of aluminum toxicity of the fish. This is a short-terra <br /> effect. It is not a human health concern. It is important to keep the <br /> aluminum buffered using a sodium aluminate and the pH very carefully <br /> between 6.5 and 8. This will require careful testing of the lake water. <br /> The Chair asked if they were reach to give the specifics on the monitoring? <br /> Dr. Mitchell was willing to do so. He stated it is an unusual decision for <br /> Conservation -Commission to look over when looking at lake restoration. The <br /> application Is going to be targeted to a depth of 40 or greater. It is 15% 0-f Clic <br />