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Underdrain System: <br />Primary Underdrain: No work occurred on the primary underdrain. <br />Secondary Underdrain: Approximately 130 lineal feet of secondary underdrain was constructed per design plans <br />west of Dump 4. <br />Tertiary Underdrain: No work occurred on the tertiary underdrain. <br />Tree Grubbing and Clearing, Chipping: <br />A Cat 330 excavator removed trees and cleared and grubbed topsoil and deleterious material from near the <br />Phase 2 Storm Water Diversion Ditch at approximate stations 3+00 to 6+00. <br />B) Underground Workings <br />• Confirmatory Drilling <br />Confirmatory drilling occurred at underground working #6446 (part of the Anaconda complex). Further <br />remediation efforts are required. <br />• Remediation <br />Approximately 200 yds3 of 4,000 PSI concrete was placed in underground working #U6273. Concrete physical <br />property testing occurred and concrete cylinders were cast for laboratory determination of compressive strength. <br />Additional remediation is required. <br />Underground workings #6112, #6285, #6310, #6311, #6390, and #6561 were excavated to competent rock, <br />backfilled with structural fill per project specification, and are considered remediated. <br />A Cat 330 excavator began excavating working #6557. Additional remediation is required. <br />Timbers were found at underground working #6560 at a depth of about 5 to 7 feet. Work stopped due to equipment <br />breakdown. Additional remediation is required. <br />AMFS survey located 12 additional unknown surface workings located near the Phase 2 Diversion Ditch and <br />Perimeter Road. <br />n) Storm Water Management <br />Best Management Practices (BMPs) are being performed. <br />Page 3 of 7 MLE2 WE 3 May 2014.doc <br />