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MINUTES OF THE PLANNING COMMISSION MEETING HELD AUGUST 18, 1986 <br />#1039 ULRICH CONTINUED <br />Pollution Control Agency - Applications on this <br />level of usage are being permitted and monitored. <br />LMCD - Concerned regarding the possibility of a de- <br />icing effect. They have the authority to prohibit <br />the use of this system if c causes a de-icing <br />effect. <br />Dean Buendorf of Terra -Therm stated that they have <br />installed over 1800 systems in Minnesota. He noted that <br />they are basically for residential use but have also <br />installed for commercial-oerations. He noted that <br />there was a similar sys'-urrently in operation on <br />Bald Eagle Lake in White Lake. He stated that that <br />system has not created a de --icing effect. <br />Planning Commission recommended that staff contact the <br />owner of the system in White Bear Lake for more <br />understanding of this system. <br />George Shoppie stated h-t based on his experience and <br />his research calculatio,, he stated the discharge pipe <br />will not create a de-icing effect. <br />Bei._ows asked him if the the discharge pipe might <br />prevent the ice from forming in the first place. <br />Mr. Shoppie stated no because the freezing action is <br />greater than the thawing action of system and during the <br />time of year when the ice is freezing, the system is not <br />operating at full capacity. <br />Rcvegno questioned the validity of a linear equal <br />velocity over the entire 20' of pipe. <br />Mr. Shoppie stated facts that supported his finding that <br />the pressure would be equal. <br />City Consulting Engineer Mike Lynch supported Mr. <br />Shoppie in his finding stating that the difference would <br />be negligable. <br />McDonald expressed concerns with setting a preceden;_ by <br />allowing this type of system and the impact on the lake <br />if many of these systems were installed. <br />Addressing McDonald's concern, Cliff Peep stated that <br />there would be little impact on the lake level due to <br />evaporation and contol by the Gray's Bay Dam. <br />2 <br />