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Slopes between 4 and 10% appear as easy grades and are suit- <br />able for practically any use. However, slopes over 8% are <br />not suitable for handicapped access (see section on Pedestrian <br />Access and Title XXIV, State Codes). <br /> <br />Slopes of 10-25% are quite steep and require noticeable effort <br />to climb or to descend and represent maximum slopes for service <br />driveways and parking areas. A slope greater than 60% may create <br />unacceptable parking areas. <br /> <br />Slopes over 25% are too steep for lawns and power mowing and <br />for general development uses. <br /> <br />Slopes over 50% cannot be protected from erosion of heavy rains <br />except by terracing or cribbing (reinforcement by embedded <br />wooden or concrete beams). These areas are not suitable for <br />development. <br /> <br />Minimum Standards <br /> <br />1. The resulting ground surface after grading must have positive drainage <br /> throughout without any isolated depressions. <br /> <br />2. Ail property must be graded to prevent surface water from draining onto <br /> neighboring properties. <br /> <br />3. Paved areas shall not drain across public sidewalks. Plans for paved <br /> areas shall show direction of surface flow to catch basins. <br /> <br />No driveway shall have a grade greater than 30%, and any portion having <br />a grade greater than 20% must have a length greater than 25 feet. Any <br />grade change in a driveway in excess of 15% shall have a minimum 10 feet <br />transition section which divides the grade change into equal parts (see <br />Parking Lot standards). <br /> <br />Building foundation, grading or excavation plans must be included as <br />part of the building permit process. Grading permits are required for <br />the following: ~ <br /> <br />a. Excavation for a building foundation in excess of 2 feet <br /> in depth. <br /> <br />b. Fill in excess of three feet in depth, not for a building <br /> foundation. <br /> <br />c. Fill in excess of 50 cubic yards. <br /> <br />~Please contact the. Development Processing Division and refer to the Uniform <br />Building Code for further details. <br /> <br />- 11 - <br /> <br /> <br />