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HomeMy WebLinkAboutKenneth Hudnell - Medora CorporationWainwright, David From: H Kenneth Hudnell, PhD <ken.hudnell @medoraco.com> Sent: Monday, March 24, 2014 9:42 AM To: Bashaw, Justin P SAW Cc: Joel Bleth Subject: [EXTERNAL] Comment on EA for Jordan Lake demonstration project Dear Mr. Bashaw: I have one correction to make concerning the Environmental Assessment for the Jordan Lake Demonstration Project. On page 2 (pdf page 9) is says "The circulators would upwell water from near the bottom of the hypolimnion to the surface (epilimnion) of the lake." To suppress cyanobacteria, wherever it is deep enough for a thermocline to develop and establish a hypolimnion and epilimnion, the circulators' intakes are set just above the thermocline. Since a steel plate is located 1 foot below the intake hose, water at that depth is drawn into the hose radially from all directions. That water is pumped to the surface where it spreads out in all directions without turbulence. So only the epilimnion is circulated. The thermocline remains intact. The hypolimnion is not disturbed. We do not want to bring the cool, dense, nutrient rich hypolimnetic water into the epilimnion and photic zone because that could stimulate, rather than suppress, cyanobacteria. So that sentence should be something like, "Wherever the lake is deep enough to enable a thermocline to establish, the circulators would upwell water from just above the thermocline to the surface of the lake so that only the epilimnion is circulated." You might also add something like, "Wherever the lake is too shallow for a thermocline to be establish, the circulators would upwell water from just above the bottom to the surface of the lake so that the entire watercolumn is circulated, but the sediment is undisturbed." Thanks, Ken H Kenneth Hudnell, PhD, VP & Dir. of Science New Bern, NC Grid Bee® / SolarBee® Medora Corp. Direct: 252 - 288 -6870; Cell: 919- 619 -3524 Factory: 701 - 225 -4495; 866.437.8076 Ken. HudnellOmedoraco.com httD://www.MedoraCo-com This e -mail and any attachments may contain confidential material that may not be disclosed, copied or distributed. If you are not the intended recipient(s), please contact the sender and delete all copies.