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1 AHP I A V -- � I M 11fS IC it <br /> Commissioners Pres-eniti V. Louise Behrman, Gertrude Ferriday, Joseph <br /> Burns, Mary Marsters. Also present were Patrick Coffey and Lisa <br /> Hanscom W <br /> 7: 15 - Stratford Ponds. Carl Crassetti stated the Notice of Intent had <br /> a request for dredging which has been removed. Dr# Alex Durand was in- <br /> troduced to present other proposals. Information on h-is company affil- <br /> iation was presented; they have been in the long term' study of water <br /> since 1971 . <br /> Dr. Durand spoke. on the different 'options available.: Mechanical harvest-' <br /> ireg; h droira� ing; plastic or fibreglass screeni g to in ib.�t growth <br /> y <br /> of weeds; lowering of the level of theAake in printer to allow free in <br /> action to disrupt the weeds. <br /> He stated copper sulphate, which is toxic to algae, is generally used- <br /> in water supply reservoirs. This has a low tonicity to humans but woulJ <br /> be a tem- porary solution requiring repetition 2--3 times per summerd <br /> enation, -is also possible; another is organic dyes added to the water. <br /> Also, aluminum sulphate reacts with the phosphorus and forms a chemical <br /> bin Iding -and would be a long term effect on algae growth. Lastly, there <br /> is dredging which is not a lasting solution. <br /> For Amos Pond two suggestions are: aluminum sulfate to control phos- <br /> ph rus and secondly, Sonar, which has been used in Fells Pond to contro) <br /> weed growth. It works on a long term - gradual basis and is -effective <br /> one to four years. Sonar has been thoroughly tested by E.P.A. <br /> Hs Behrman stated this is a good wildlife area and both suggested ave- <br /> nues would disrupt an eco system by disrupting a food chain. <br /> Dr. - Durand stated Pleuridon, AKA Sonar, has no effect on single cell <br /> algae. Ms Behrman asked if the aluminum sulphate would bind with hydro- <br /> sen? Dr.:- Durand stated it is added with a buffering compound to neutral- <br /> rumi e the - excess acidity which could be sodium aluminate, lime, r sod - <br /> y <br /> h droxide. He added, the amount of increased , sa4lt content is very small) <br /> one PPM. Ms Behrman stated assurance would be required the insect breed- <br /> ing cycles would not be disrupted. He agreed to provide data on studies <br /> that were done and also a list of the wetland plants susceptible - o <br /> Sonar. <br />