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6.2 Compaction (General) ' After each layer of fill material has been placed, spread, and moisture conditioned, the layer shall be compacted by passing compaction equipment over the entire surface of the layer a sufficient number of times to obtain the required compaction t determined on the basis of the specified quality assurance tests. Should the surface of the fill become rutted or uneven subsequent ' to compaction, it shall be re-leveled before the next layer of fill i l d s p aced an , if required by the Engineer, recompacted by and at the expense of the Contractor. Compaction shall be accomplished by approved equipment. The ' Engineer will continuously evaluate the Contractor's equipment and methods. If such equipment or methods are found unsatisfactory for the intended use, the Engineer will require the Contractor to ' replace the unsatisfactory equipment with other types or adjust methods until proper compaction is achieved. Compaction for cohesive soils shall be based on ASTM D 698. A minimum compaction of 95 percent of the laboratory Standard Proctor dry density shall ' be achieved. Compaction of cohesionless soils shall alsc be to 95 percent of standard Proctor dry density where applicable, and based on method specification elsewhere. ' Insofar i t as practical, the material shall be brought to the fill i l t i th t t t proper mo ure con en pr or s o acemen e . p n Supplementary water, if required, may be added to the material by sprinkling on the fill and it shall be mixed uniformly throughout the layer by h;.rrowing or blading prior to compaction of the layer. ' Such addition of water is subject to the approval of the Engineer. 6.3 Leach Pad Base ' The leach pad base shall be constructed of native materials as described in Section 5.2. The material shall be placed in horizontal loose lifts not exceeding 12 inches in thickness. The N-12