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4 . Unsuitable Material — All muck or other unsuitable material within the limits of building sites , or other designated areas , shall be excavated and removed . Depth of removal shall be that required to reach an approved suitable material . Removal and subsequent backfilling shall be maintained within the limits of the designated construction area unless specifically approved otherwise by the County. Sheeting shall be installed and left in place along the site boundary , where required , in order to preclude infringement on adjacent property and prevent damage by future de-mucking . The Contractor shall dispose of muck or other unsuitable material . 5 . Fill — Suitable fill material shall be placed and compacted where muck or other unsuitable material has been removed and as required to elevate the site to finished grade . Fill material shall conform to U . S . Bureau of Public Roads , Classification A-3 , and as approved by a testing laboratory and the Public Works Division . Fill shall be placed in successive layers of not more than 12 inches , loose measure , and suitably I compacted to 95 % minimum of maximum density, as determined by AASHTO Specifications T- 180 , unless higher percentage is necessary in specific locations . Side slopes shall not exceed 2 . 5 (horizontal ) to 1 (vertical ) , unless specifically approved otherwise , and shall be protected from erosion by staggered solid grass sodding , or other approved method . An approved , Florida State Certified testing laboratory shall make density tests for determination of the specified compaction . 6 . Grading — All building sites shall be properly graded , including all cutting and filling necessary for the construction . Finish building site elevations shall be as required to preclude flooding and shall receive prior approval from the County. Filling shall be accomplished , if necessary , to provide acceptable site elevations . Finish surface grades shall eliminate potholes , abrupt changes in grade and bring the ground to an even surface , and shall provide adequate drainage for the complete site , with special consideration for the following . The grade shall be sloped evenly to provide drainage away from the building walls in all directions at Y4 inch per foot minimum for at least 10 feet from the building walls . Drainage swales shall have a minimum flow-line grade of not less than 1 /8 inch per foot. Rounding shall be provided at top and bottom of banks and at other breaks in grade . 7 . Asphaltic Concrete Pavement — Driveways , parking locations and other vehicular traffic areas at building sites shall be paved with an asphaltic concrete surface course . The dimensions for said surfacing shall be in accordance with good engineering practice and suitable for the designated service . Roadbed stabilization shall be 6-inch minimum below the base course and shall have a minimum Florida Bearing Value of 50 pounds per square inch . Base course shall be limerock or soil-cement, placed to 6-inch minimum thickness . Prime coat shall be rapid curing cutback asphalt RC-70 , applied at the rate of 0 . 10 gallon per square yard . Asphaltic Concrete Surface Course shall be 1 -inch minimum thickness , Type ll . 13-2