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� HARDCOVER ORDINANCE - In 1975, the Orono City Council adopted an ordinance limiting the <br /> percentage of lot area that can be covered with impervious surface ("hardcover") such as r�,ofs, . ' <br /> • driveways, sidewalks, etc. on properties located within 1,000 feet of a lake. Studies have shown that <br /> sediments, oils, and debris carried into the lake from highly urbanized areas have a detrimental , <br /> impact on the quality of water in the lake. The intent of Orono's ordinance is to ensure that rainfall <br /> run-off will be cleansed by filtering through grassed or vegetated yard areas before entering the lake. <br /> Hardcover Zones — Hardcover includes: <br /> Allowed <br /> Percenta es: <br /> 0-75 0% ✓ Roofs, <br /> 75-250' 25% ✓ Sidewalks, <br /> 250-500' 30% ✓ Paved or gravel driveways, <br /> 500-1000' 35% ✓ Patios & decks (includes slatted decks), <br /> ✓ Tops of retaining walls & rock walls, <br /> ✓ Decorative landscape areas underlain by plastic sheeting or <br /> fabric, or <br /> ✓ Any other surface that does not allow direct absorption of rainfall <br /> into the round. <br /> INSTRUCTIONS FOR COMPLETING HARDCOVER CALCULATION 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 to get <br /> 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 percentage of <br /> 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 before <br /> proceeding with your project planning! <br />