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CITY of ORONO <br />Street Address: <br />2750 Kelley Parkway <br />Orono, MN 55356 <br />Municipal Offices <br />Mailing Address: <br />P.O . Box 66 <br />Crystal Bay, MN 55323-0066 <br />HARDCOVER ORDINANCE -In 1975, the Orono City Council adopted an ordinance <br />limiting the percentage of lot area that can be covered with impervious surface ("hardcover") <br />such as roofs , driveways , sidewalks, etc. on properties located within 1,000 feet of a lake. <br />Studies have shown that sediments , oils, and debris carried into the lake from highly urbanized <br />areas have a detrimental impact on the quality of water in the lake . The intent of Orono's <br />ordinance is to ensure that rainfall run-off will be cleansed by filtering through grassed or <br />vegetated yard areas before entering the lake . <br />Hardcover Zones -Allowed Percentages: <br />0-75 0% <br />75-250' 25% <br />Hardcover includes: <br />-Roofs <br />-Sidewalks <br />250-500' <br />500-1000' <br />-Paved or gravel driveways <br />-Patios & decks (includes slatted decks) <br />-Tops of retaining walls & rock walls <br />30% <br />35% <br />-Decorative landscape areas underlain by plastic sheeting or fabric <br />-Any other surface that does not allow direct absorption of rainfall into <br />the ground <br />INSTRUCTIONS FOR COMPLETING HARDCOVER CALCULATION <br />WORKSHEET <br />1. Circle which setback zone (0-75', 75-250', etc.) the calculation is for. <br />2 . For each item of hardcover within that zone , enter the length and width, and multiply <br />to get square footage (s.f.). <br />3. Add up all the square footages to get total square footage of hardcover. <br />4. Divide by the total area of property within the zone and multiply by 100 to get <br />percentage of hardcover in the zone . <br />5. If changes in hardcover are proposed, you should do a "before" worksheet and "after <br />worksheet. If either results in percentages greater than those allowed, contact City staff <br />before proceeding with your project planning! <br />Telephone (612) 473-7357 • FAX 473-0510 <br />12