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PART 3: EXECUTION <br />3.01 EXCAVATION: <br />• A. The CONTRACTOR will be responsible for the safety of temporary construction slopes. <br />CONTRACTOR shall inspect all temporary and permanent open-cut excavations on a regulaz <br />basis for signs of instability. Should signs of instability be noted, CONTRACTOR shall <br />immediately undertake remedial measures and shall notify MANAGER immediately. <br />Permanent cut slopes shall be left in smooth, safe, and stable condition at the end of the workday. <br />B. CONTRACTOR shall conduct all excavation and shoring operations in compliance with <br />applicable Colorado State and Federal government laws and regulations. <br />3.02 FILL PLACEMENT: <br />A. Structuml Fill <br />1. CONTRACTOR shall condition, place and compact Structurnl Fill by a method <br />compaction technique, as discussed in Section 2200.0. <br />Maximum rock size for rock fill shall be two-thirds of the compacted lift thickness, <br />unless otherwise approved by MANAGER, DESIGN ENGINEER and <br />CERTIFYING ENGINEER. CONTRACTOR shall remove oversize materials from <br />fills at no additional cost to CC& V. <br />B. Select Structural Flll <br />1. CONTRACTOR shall condition and compact the Select Structural Fill using a method <br />specification on 3 foot thick lifts that result in a firm surface that will be approved by <br />• the CERTIFYING ENGINEER. <br />C. Coarse Shag Backfill <br />Coazse Shaft Backfill shall be placed in the undergound workings as part of <br />remediaticn, as shown in the DRAWINGS. <br />2. CONTRACTOR shall compact and condition the final surface of the Coarse Sha$ <br />Backfdl using a method specification that results in a firm surface that will be approved <br />by CERTIFYING ENGINEER <br />3.03 NATIVE MATERTAI, <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 Soil Liner Fill <br />subgrade elevation. The surface of the native material at this elevation will then be compacted using a <br />method 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 <br />Plug and Cemetend Rockfill as shown on the DRAWINGS. <br />• <br />Secton 02210 Page 2 of 3 Mazch 22, 2000 <br />Underground Working Remediation Golder Associates Revision 1 <br />I100IOBSASJ-21]OWC CERT[FICATIONREPORIWHASE wC OSA CER'!\APPENDIC@5'NPPENDIX E rECNMCAl SPECQ~iCAr10NS10~l0RIDOC <br />