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To: LOCAL SURVEYORS <br />From: Michael P. Gaffron, Asst Planning & Zoning Administrator <br />Date: July 22, 1988 <br />Subject: hardcover Calculations <br />In 1975, the Orono City Council adopted an ordinance limiting the <br />percentage of lot area that can be covered with impervious su:-faces <br />("hardcove r"), such as roofs, driveways, sidewalks, etc. on properties <br />located within 1,000 feet of a lake. Studies have shown that sediments, <br />oils, and debris carries into the lake from highly urbanized areas have a <br />detrimental impact on the quality of water in the lake. The intent of <br />Orono's ordinance is to insure that rain water run-off will be cleansed by <br />filtering through grass or vegetated yard areas before entering the lake. <br />You will undoubtably be receiving an increasing number of requests to <br />calculate hardcover for clients who are proposing residential construction <br />projects within the City of. Orono. A number of recent submittals by <br />surveyors have omitted certain items of hardcover which the City deems to <br />be hardcover, and there also appears to be a misunderstanding how the <br />various hardcover zones are calculated. <br />In order to eliminate any confusion, ar' ^:inimize last minute <br />surprises to your clients, the following hardcover calculation guidelines <br />should be adhered to: <br />1. The shoreline for setback and hardcover calculation purposes <br />commences at the 929.4 elevation. for Lake Minnetonka. <br />2. In the first 75' inland, measured perpendicular to the shoreline, <br />0% hardcover is allowed. The 0-75' hardcover percentage is calculated <br />as follows: <br />S.F. of Hardcover in 0-75' Zone x 100 = % hardcover in <br />Area of 75-250' Zone 0-75' Zone <br />3. The second incremental hardcover zone is the 75-250' setback zone, <br />which is comprised of the area within the property boundaries between <br />the i5' and 250' setback line. Within this zone, 25% hardcover is <br />allowed. Hardcover in this zone calculates as follows: <br />S.F. of Hardcover in 75-250' Zone x 100 - s. Hardcover in <br />Area of 75-250' Zone 75-250' Zone <br />4. ; irr,ilar calculations are ade for the :-500' zone, where 30% <br />hardcover is allowed and th 500-1,000' -re 35% has' -over is <br />allowed. Note that non -riparian, non-lakesho_: -of,, a;? st subject <br />to hardcover standards of the City if locates? .R-Di ,trice. <br />5. The following items are considered hardc ,y the City, and must <br />he included in your calculations: <br />