All fills shall be compacted throughout their full extent to a minimum of ninety percent (90%) of maximum density as determined by appropriate ASTM standard methods or other alternate methods approved by the city engineer. Tests to determine the density of compacted fills shall be made on the basis of not less than one test for each two foot (2') vertical lift of the fill but not less than one test for each one thousand (1,000) cubic yards of material placed. Additional density tests at a point approximately one foot (1') below the fill slope surface shall be made on the basis of not less than one test for each one thousand (1,000) square feet in slope surface but not less than one test for each ten foot (10') vertical increase of slope height. All tests shall be reasonably uniformly distributed within the fill or fill slope surface. Results of such testing and location of tests shall be presented in the periodic and final reports. Compaction may be less than ninety percent (90%) of maximum density, as determined by the above test, within six inches (6") of the slope surface when such surface material is placed and compacted by a method acceptable to the city engineer for the planting of the slopes. Compaction of temporary storage fills, to be used for a period of not greater than six (6) months, shall not be required, except where the city engineer determines that compaction is necessary as a safety measure to aid in preventing saturation, sliding, or erosion of the fill. (Ord. 1523, 4-11-1995)