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ameO <br /> 3.03 NATIVE MATERIAL <br /> For the remediation of shafts greater than 25 feet, which are currently backfilled with native material, <br /> CONTRACTOR shall excavate the current native backfill to a depth of 25 feet below existing grade <br /> elevation. The surface of the native material at this elevation will then be compacted using a method <br /> specification that results in a firm surface that will be approved by CERTIFYING ENGINEER. <br /> CONTRACTOR shall then remediate the underground working using Coarse Shaft Backfill, Cement Plug, <br /> Cemented Rockfill,and/or Geogrid cap as shown on the DRAWINGS. <br /> 3.04 BLASTING <br /> The CONTRACTOR shall compact the surface of the area that has been blasted. If the blasted surface is <br /> below the Soil Liner subgrade elevation, the CONTRACTOR shall compact the blasted surface using a <br /> method specification approved by the CERTIFYING ENGINEER, and then remediate according to the <br /> DRAWINGS to achieve the design grades and elevations. If the blasted surface is above the Soil Liner <br /> subgrade elevation, the CERTIFYING ENGINEER assess the foundation conditions and recommend <br /> whether the CONTRACTOR shall overexcavate and backfill with Cemented Rockfill and <br /> Structural/Overburden Fill, or if the CONTRACTOR shall remove excess material and compact the final <br /> grade surface using a method specification approved by the CERTIFYING ENGINEER. <br /> *** END OF SECTION*** <br /> Section 02210 Page 3 of 3 May 9,2012 <br /> Underground Working Remediation Revision 1 <br />