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B-z Technical. Requirements: All compacted materials shall be densified TO—a density not less than 90 per cent relative compaction based on ASTM Test Method D1557-70. The location and frequency of field density tests shall be as determined by -the Soils Engineer. The results of these tests and compliance with these specifications shall be the basis upon which satisfactory completion of work will be judged by the .Soils Engineer.. Site and Foundation Conditions: The. Contractor -is .presumed to have visited the site and to have .familiarized himself with existing . site conditions and the contents of the data presented in the soil report. The Contractor shall make his own interpretation of the data contained in said report, and the Contractor shall not be relieved of liability under the contract for any loss sustained as a result of any variance between conditions indicated by or deduced from said report and the actual conditions encountered during the progress of the work. Dust Control: The work includes dust control as required for the alleviation or prevention of any -dust nuisance on or about the site or the borrow area, or off-site if caused by the Contractor' s operations either during the performance of the earthwork or resulting from the conditions in which the Contractor leaves the site. The Contractor shall assume all liability' including court costs of codefendants for all claims related to dust or windblown materials attributable to his work. SITE PREPARATION Site preparation shall consist of site clearing and grubbing and the preparation of foundation materials for receiving fill. Clearing and Crubbin : The Contractor shall accept the site in .its present condition and shall demolish and/or remove from the area of designated project earthwork all structures, both surface and subsurfaces trees, brushy roots, debris$ organic matter, and all other matter determined by the Soils Engineer to be deleterious.. Such materials shall become the property of the Contractor and shall be removed from the site. Tree root systems in proposed building areas should be removed to a minimum depth of three (3.0) feet and to such an areal extent which would permit removal of all roots larger than one (1) inch. Tree root removal in parking areas may be limited to the upper one and one-half (lam) feet of the ground surface. .Backfill or tree root excavation should not be permitted until all exposed surfaces have been inspected and the Soils Engineer is present for the proper control of backfill placement and compaction.. Burning in areas which are to receive fill materials shall not be permitted.