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When existing ground surface has a density less than that specified under "Compaction" for the particular area classification, break up the ground surface, pulverize, moisture - condition to the optimum moisture content, and compact to required depth and percentage of maximum density. ' D. Fill Placement: 1 1. Material placed in fill areas under and around structures shall be deposited within the lines and to the grades shown on the Drawings or as directed by the Engineer, making due allowance for settlement of the material. Backfill shall be carried up evenly on all walls of an individual structure simultaneously with no more than a two foot elevation variation allowed. Fill with no more than a two 4. Fill shall be dumped and spread in layers by a bulldozer or other approved method. During the process of dumping and spreading, all roots, debris, and stones greater in size than specified under Materials, shall be removed from the fill areas, and the Contractor shall assign a sufficient number of men to this work to insure satisfactory compliance with these requirements. 5. If the compacted surface of any layer of material is determined to be too smooth to bond properly with the succeeding layer, it shall be loosened by harrowing or by another approved method before the succeeding layer is placed. 1 6. All fill materials shall be placed and compacted "in- the -dry." The Contractor shall dewater excavated areas as required to perform the work and in such manner as to preserve the undisturbed state ' of the natural inorganic soils. 07/06 02220 -11 05 -5564 foot elevation variation allowed. Fill shall be placed only on ' properly prepare surfaces which have been inspected and approved by the Engineer. 2. Fill material can be obtained from cut areas within the construction project site. If sufficient satisfactory soil material is not available ' from excavation on site, the Contractor shall provide fill material as may be required from off -site sources at no additional cost to the Owner. 3. Fill shall be brought up in substantially level lifts throughout the site, starting in the deepest portion of the fill. The entire surface of the work shall be maintained free from ruts, and in such condition that construction equipment can readily travel over any section. Fill shall not be placed on surfaces that are muddy, or against concrete structures until they have attained sufficient strength. 4. Fill shall be dumped and spread in layers by a bulldozer or other approved method. During the process of dumping and spreading, all roots, debris, and stones greater in size than specified under Materials, shall be removed from the fill areas, and the Contractor shall assign a sufficient number of men to this work to insure satisfactory compliance with these requirements. 5. If the compacted surface of any layer of material is determined to be too smooth to bond properly with the succeeding layer, it shall be loosened by harrowing or by another approved method before the succeeding layer is placed. 1 6. All fill materials shall be placed and compacted "in- the -dry." The Contractor shall dewater excavated areas as required to perform the work and in such manner as to preserve the undisturbed state ' of the natural inorganic soils. 07/06 02220 -11 05 -5564