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DNR INFORMATION <br />(612) 296 -6157 <br />STATE OF <br />Ll V Ll V IE S LI n <br />DEPARTMENT OF NATURAL RESOURCES <br />BOX 25, CENTENNIAL OFFICE BUILDING • ST. PAUL, MINNESOTA • 55155 <br />August 1, 1983 <br />Joseph Chlebeck, Clerk <br />City of Little Canada <br />515 Little Canada Road <br />Little Canada, MN 55117 <br />Dear Mr. Chlebeck, <br />FILE NO. <br />Your letter regarding the stench and sludge problem on Gervais Lake was <br />referred to me for reply. <br />An inspection was made of Gervaid Lake on July 22, 1983. The whole lake <br />was looked at along with each inlet and storm sewer for any signs of raw <br />sewage, sludge or any other foreign substances. No sludge or raw sewage was <br />found. What was found was large beds of rooted aquatic plants with filamentous <br />algae forming a mat over the top. The appearance of filamentous algae floating <br />on water is frequently mistaken for sewage or other foreign substances. <br />What causes the appearance of filamentous algae and what can be done about <br />it are frequently asked questions. What causes filamentous algae and other <br />aquatic problems are excessive nutrients entering and recycled in the lake. <br />When environmental conditions are right aquatic vegetation will grow. An <br />Aquatic Nuisance Control Permit has already been issued to control submerged <br />vegetation and filamentous algae. The permit was issued to the local home <br />owners group with the work to be done by the Lake Restoration Company. The <br />first spraying was done on June 14 -16, 1983. At this time it is not known <br />what chemical was used. <br />If you have any further questions, please feel free to contact me. <br />DBZ:bl t <br />Si rely yours, <br />1 <br />David B. Zap••tillo, Aquatic Biologist <br />Ecological Services Section <br />Division of Fish and Wildlife <br />AN EQUAL OPPORTUNITY EMPLOYER <br />AUG 3 1983 <br />CITY OF <br />LITTLE CANADA <br />