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Zoning File 11039 June 12, 1986 Page 2 of 4 Review of Application The application is two fold. The first part deals with the geothermal heating and cooling system and the second part deals with a request to dredge the lagoon and place a filter fabric on the altered bed of lagoon and then covered with 1 foot of sand. The first part is clearly under the joint jurisdiction and review of the DNR and City. The second part is solely under the jurisdiction of the DNR. Staff has reviewed the dredging application with Noble and Judy Boudreau of the DNR rnd both have confirmed that dredged materials will not be placed on '_he Ulrich site but will be removed from cite by Minnetonka Portable Dredging. In addition staff advised Boudreau that the City of Orono granted a conditional use permit to the previous owner, David Dunlop, for the dredging of the lagoon providing a minimum 3 foot draft for Dunlaps boats in 1979. The orginal DNR permit .nd resolution have been enclosed for your information. Staff noted the following to Boudreau: 1. App_.icant requests 5' to 6' depths - appears to exceed 4 feet minimum depths allowed under DNR standards. 2. Applicant has ample area c,- main lake with ability to install 100 feet length docks to seek desired depth for navigation of boats. 3. Filter fabric/sand bed will effect natural xpawning grounds of northern pike and crappie (review letter from J.M. Wood, F.W.B.I. dated 11/13/78 written for David Dunlap's revs -w). Boudreau has .vised that she will keep staff posted on the dredging phase of the application but she noted the Fisheries Department has already said no to the filter fabric and sand bed in the lagoon. Dredging to depths in excess of 4 feet presents real concern for their department because applicant has ample area on the main lake to construct a dock. The geothermal system will provide an economical system to heat and cool the new re&idence. The water supply will be ground water pumped from a well. The water will be circulated through the house providing either heating or cooling and then discharged via V underground PVC and ductal iron piping that would extend 100 feet into the lake. The pipe would be placed 5 to 6 feet under ground ind enter the lake bed approximately 50 feet from the shoreline located 412"* below the high water elevation. The discharge portion of the submerged pipe (last $0 feet of iron pipe that extends into lake) will consist of 64 3/4 inch diameter holes. Staff has asked Noble to submit the following information: