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40 <br />proposed building foundations or paving subgrade, the areas within road rights - <br />of -ways, under parking areas, and the areas under and within five feet of <br />proposed buildings shall be precompacted. This 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 minimum density of 95% of maximum as determined by <br />AASHTO T-180. The maximum spacing between density tests shall be 150 <br />t . feet. <br />7. COMPACTION <br />A. Backfill material shall be compacted to 95% of maximum density per <br />AASHTO T-180. Equipment suitable and adequate for uniform compaction <br />to the specified density shall be used for backfill operations subject to the <br />approval of the Engineer. All compaction equipment shall be in good working <br />order and any worn or defective equipment shall be immediately replaced or <br />repaired. <br />8. SOIL STABILITYAND 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 or his worts with the stability and compaction levels required by <br />l.o.... 4:.......... C till be en 0. spea.ti n.neivua. ompaiiivri tests Suau ve t8n.0 as rntervaa eaaa.0 in..tu <br />t or as deemed necessary by the Engineer. <br />B. Any proposed alternative test methods to those specified herein must be <br />i 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 the Engineer may require to evaluate the method for approval. <br />C. In no case shall the Contractor proceed with construction on compacted <br />material until the tests prove satisfactory and approval is given by the <br />Engineer. <br />i_ <br />D. In general, at least one test for maximum dry density/optimum moisture <br />content shall be performed 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 shall 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 />02203-2