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B . If soil cement paving is proposed, local yellow sand or hard pan shall not be used for the subgrade nor in the base. 6. PRE-FILL COMPACTION A. Should the pre-fill surface elevation be below that required for the base of proposed building foundations or paving subgrade, the areas within road rights-of-ways , under parking areas, and the areas under and within five feet of proposed buildings shall be precompacted . This precompaction shall be performed equally on existing ground and on surfaces which have been excavated to remove unsuitable material . The top two (2) feet of said areas shall be compacted to a minimum density of 95 % of maximum as determined by AASHTO T- 180 . The maximum spacing between density tests shall be 500 feet. 7. COMPACTION A. Backfill material shall be compacted to 95 % of maximum density per AASHTO T- 180 . Equipment suitable and adequate for uniform compaction to the specified density shall be used for backfill operations subject to the approval of the Engineer. All compaction equipment shall be in good working order and any worn or defective equipment shall be immediately replaced or repaired . 8 . SOIL STABILITY AND COMPACTION CONTROL A. The Contractor shall arrange to have sufficient soil tests made by an independent testing laboratory selected by the Engineer to demonstrate conformance of his work with the stability and compaction levels required by these specifications . Compaction tests shall be taken at intervals listed herein or as deemed necessary by the Engineer. B . Any proposed alternative test methods to those specified herein must be approved by the Engineer prior to testing. At the request of the Engineer, the Contractor shall provide such documentation of a proposed alternative test method as the Engineer may require to evaluate the method for approval . C . In no case shall the Contractor proceed with construction on compacted material until the tests prove satisfactory and approval is given by the Engineer. D . In general, at least one test for maximum dry density/optimum moisture content shall be performed on a representative sample of each inherently different material to be used for compacted backfill or embankment fill . For material of uniform composition and textural .class, a minimum of one test per 200 cu. yd. of material shall be performed at the point of use. E. Tests for in-place density (percent compaction) shall be taken at locations designated by the Engineer. E:\PSW\P\99-9Ie\TechsSpecs\techspec-02203 .doc 02203 -2