07/27/2000 CONSERVATION COMMISSION Minutes

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27 July 2000 Page 6, Mr. Sherman stated the Commission is going to mention tonight, as this goes on, a number of places where there needs to be' sone clarification. ]fir. Howes stated where the pipe goes is a critical point in this whole process. Phosphorus, not nitrogen, is the focus of this system. Controlling phosphorus is critical.- They do see some blooms in the pond and they do not want then to get bigger and longer in duration. The phosphorus in the system is what drives the health of the pond on a short term basis. The Chair asked if they had any figures on the volume coning in on the source. Dr. Howes stated it is referred to in the document. The plume is the most significant source of phosphorus. why they targeted the deeper basin is that one-half of the phosphorus in the pond in September is below this 14 meters which is actually 45 feet, so they may get -60% of the total phosphorus in the pond knocked down and bound up. This 5' is only about 100 of the area of the pond. The current condition o ' is 28 acnes which is about 15% of the area of the pond. What is coning out of the plume is plant available phosphorus. once it hits the pond it is taken up and it goes into algae. The specifics of the plan are to do habitat protection-, shift the pond from . Meso-Eutrophic to Mesotrophic. It is remediation, restoration. It reduces the potential for blue green algae problem and the major habitat enhancement is to decrease the bottom anoxic volume to get more habitat for tidewater musket. The Chair asked if the dark ]glue on the chart ten .ores` Dr. Howes stated i is 28 acres and it is '. The key thing he is talking about is oxygen. They did this in a salt water emba went in Falmouth. They did get that project permitted specifically as a habitat improvement project to control and ,improve oxygen conditions.to increase benthic diversity. The Chair did not understand, he thought in the application that they proposed to apply the treatment to a 10 acre parcel of the pond. Mr, smith stated it is a 28 acre parcel of the pond. It is a little over 10%. Dr. Howes stated that is 10% of the surface area of the pond, The Chair stated it sloes not look-anything like it. Dr. Howes stated that is the real area. That is 15%. The pond is 203 acres and the area of treatmentis 2 acres.