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Kvaerner Metals Project No. 306900 <br />General Specification No. GC-01 <br />Site Work <br />Structures and pipelines shall be adequately supported in all situations where <br />adjacent excavation undercuts or reduces the support of such structures and <br />pipelines. <br />' Open excavations adjacent to lines of normal vehicular or foot traffic shall be <br />suitably protected by berm or barricades and warning lights. <br />Springs or seepage water encountered shall be reported to the Engineer. If the <br />drawings do not indicate drainage facilities, provisions for the permanent care of <br />such water shall be made as directed by the Engineer. <br />Excess excavated material, or materials not suited for use in backfill shall be <br />disposed of in spoil areas approved by the Engineer. <br />' 6.2 Structural Backfill + <br />All excavations to be backfilled shall be dry, clean and free of all shoring <br />materials, forming materials, trash and debris prior to the starting of backfill. No <br />such materials shall be allowed to be included with the backfill materials. Areas to <br />' be backfilled shall be inspected and approved by the Engineer prior to the <br />placement of material. <br /> Backfill shall not be placed against walls for 7 days after pouring and until the <br /> concrete has attained 90% of its specified 28 day strength, in order to withstand <br /> the pressure of Backfill as placed and compacted. Backfill shall be brought up <br /> and compacted in essentially uniform heights around all sides of columns or <br />footings, er on both sides of subgrade walls. Motorized hauling or compaction <br /> equipment, except hand compactors, shall not approach concrete structures <br /> closer than 3 ft. <br /> Backfill material for open excavation adjacent to foundations, footings, cut-off <br /> walls, retaining walls, etc., shall comply with the requirements of Section 5.3, and <br /> shall be placed and compacted as specified. <br /> Sand Backfill shall be free from debris or organic contamination and possessing <br /> particle size grading within the following limits: <br /> Passing the No. 4 sieve: 100% <br /> Passing the No. 200 sieve: 15% max. <br /> Sand Backfill shall be placed in uniform lifts not exceeding 12 in. in loose <br />1 thickness and shall be compacted to 95 percent maximum density. <br /> Oiled sand under tanks shall be free from corrosive elements and shall be at <br />1 least 4 in. in thicknecs. -£:l shall be-~.rar 2 diesel eil ~:,~ shall be in sufficient <br /> quantity to thoroughly wet the sand without saturation. Application of oil shall be <br /> done by spraying. <br /> <br />J:V°fi9MP19PECl5TitUCT00015PC.00C, Rw. 111 8 • PhpW JuN 27, 1999 <br />