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1. Prior to issuance of the grading permit, potential rock disposal areas shall be delineated on the grading plan. 2. Rock sizes greater than 12 inches (305 mm) in maximum dimension shall be 10 feet (3048 mm) or more below grade, measured vertically. 3. Rocks shall be placed so as to assure filling of all voids with well-graded soil. J109.4 Compaction. All fills shall be compacted to a minimum of 90 percent of maximum density. J109.5 Slope. The slope of fill surfaces shall be no steeper than is safe for the intended use. Fill slopes shall be no steeper than 1 unit vertical in 2 units horizontal (50% slope). SECTION J110-SETBACKS J110.1 General. Cut and fill slopes shall be set back from site boundaries in accordance with this section. Setback dimensions shall be horizontal distances measured perpendicular to the site boundary. Setback dimensions shall be as shown in Figure J-1. J110.2 Top of Cut Slope. The top of cut slopes shall not be made nearer to a site boundary line than one fifth of the vertical height of cut with a minimum of 2 feet (610 mm) and a maximum of 10 feet (3048 mm). The setback may need to be increased for any required interceptor drains. J110.3 Toe of Fill Slope. The toe of fill slope shall be made not nearer to the site boundary line than one half the height of the slope with a minimum of 2 feet (610 mm) and a maximum of 20 feet (6096mm). Where a fill slope is to be located near the site boundary and the adjacent off-site property is developed, special precautions shall be incorporated in the work as the building official deems necessary to protect the adjoining property from damage as a result of such grading. These precautions may include but are not limited to: 1. Additional setbacks. 2. Provision for retaining or slough walls. 3. Mechanical or chemical treatment of the fill slope surface to minimize erosion. 4. Provisions for the control of surface waters. 64