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do <br />• <br />r <br />proposed building foundations or having subgrade, the areas within road rigltts- <br />of-ways, under parking areas, and the areas under and within five feet of <br />proposed buildings shall be precompacted. 'flus precompaction shall be <br />performed equally on existing ground and on surfaces which have been <br />excavated to remove unsuitable material. The top one foot of said areas shall <br />be compacted to a minitnutn density of 95% of maximum as determined by <br />AASI-ITO T-180. The maximum spacing between density tests shall be 150 <br />feet. <br />7. COMPACTION <br />A, Backfill material shall be compacted to 95% of maximum density per <br />AASIITO T-1130. Equipment suitable and adequate for uniform compaction <br />to time specified density shall be used for backfill operations subject to the <br />approval of the Engineer. All compaction equipment sltall be in good working <br />order and any worn or defective equipment shall be immediately replaced or <br />repaired. <br />8. SOIL STABILITYA.ND COMPACTION CONTROL <br />A. The Contractor shall arrange to have sufficient soil tests made by an <br />independent testing laboratory selected by the Engineer to demonstrate <br />conformance of his work with the stability and compaction levels required by <br />these specifications. Compaction tests shall be taken at intervals listed herein <br />or as deemed necessary by the Engineer. <br />B. Any proposed alternative test methods to those specified herein must be <br />approved by the Engineer prior to testing. At the request of the Engineer, the <br />Contractor shall provide such documentation of a proposed alternative test <br />method as Elie Engineer may require to evaluate the method for approval. <br />C. In no case shall the Contractor proceed with construction on compacted <br />"late' -jai until the tests prove satisfactory and approval is given by the <br />Engineer. <br />D. In general, at least one test for maximum dry densityloptimura moisture <br />content shall be perforated on a representative sample of each inherently <br />different material to be used for compacted backfill or embankment fill. For <br />material of uniform composition and textural class, a minimum of one test per <br />200 cu. yd. of material sltall be performed at the point of use. <br />E. Tests for in-place density (percent compaction) shall be taken at locations <br />designated by the Engineer. <br />tl. U-1-2 <br />