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Cal -Farm 02071 - 5 882526.01 <br />5 December 1989 <br />WPSPECS2:02071CAL.FRM <br />B. <br />Native soil requiring aeration will be placed on the aeration pad <br />designated by the Engineer and as shown on the Drawings. Soils will <br />be placed to a maximum depth of ten (10) inches on the pad. <br />Every two (2) weeks, the Contractor shall return to the project site <br />and turn over the soil by conventional disking methods. Disking <br />equipment shall be of such design that the upper seven (7) inches of <br />_ <br />soil is turned by the discing procedure. <br />After the soil has been overturned twice, the Engineer will collect <br />— <br />soil samples for laboratory analyses. After receipt of the results of <br />laboratory analyses, the Engineer will direct the Contractor to either <br />continue aeration operations or backfill the tank excavation with <br />favorably reviewed aerated native soil as determined by the Engineer. <br />3.05 <br />BACKFILL AND COMPACTION <br />A. <br />Backfill excavation with Native or Import Backfill materials as <br />specified in Section 02201 EARTHWORK. <br />B. <br />Place backfill materials in 12 -inch (maximum pre -compaction) lifts <br />c <br />uniformly to the finished grade shown on the Drawings or as necessary <br />to match existing adjacent finished grade. <br />C. <br />Compact backfill to 90 percent relative density except within 12 <br />_ <br />inches of finished grade compact backfill to 95 percent relative <br />density. Compact backfill as required in Compaction paragraph of Part <br />3, Section 02201 EARTHWORK. <br />END OF SECTION <br />Cal -Farm 02071 - 5 882526.01 <br />5 December 1989 <br />WPSPECS2:02071CAL.FRM <br />