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Specification No . : RGS0024-87 Part II - SPECIFIC CONDITIONS Section 10 - Earthwork the side of the building below a line sloping down and away at a 2 : 1 (horizontal to vertical ) slope from the bottom outside edge of all footings . Do not backfill trenches until tests and inspection have been made and backfilling authorized by Engineer . Use care in backfilling to avoid damage or displacement of pipe systems . 10 . 6 . 3 Compaction: 10 . 6 . 3 . 1 General : Control soil compaction during construction providing minimum percentage of density specified for each area classification. 10 . 6 . 3 . 2 Percentage of Maximum Density Requirements : Compact soil to not less than the following percentages of maximum dry density for soils which exhibit a well defined moisture density relationship determined in accordance with ASTM D1557 -78 ; and not less than the following percentages of relative density , determined in accordance with ASTM D2049 , for soils which will not exhibit a well defined moisture density relationship . 10 . 6 . 3 . 2 . 1 . Structures : Compact subgrade and each layer of backfill or fill material at 95 % relative dry density . 10 . 6 . 3 . 2 . 2 Building Slabs : Compact subgrade and each layer of backfill or fill materials at 95 % maximum dry density . 10 . 6 . 3 . 3 Moisture Control : Where subgrade or layer of soil material must be moisture conditioned before compaction , uniformly apply water to surface of subgrade , or layer of soil material , to prevent free water appearing on surface during or subsequent to compaction operations . Remove and replace , or scarify and air dry , all material that is too wet to permit compaction to specified density . Soil material that has been removed because it is too wet to permit compaction may be stockpiled or spread and allowed to dry . Assist drying by discing , harrowing or pulverizing until moisture content is reduced to a satisfactory value . • X-5