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DEC - b- 9 3 M O N 1 7 4 3 Larry Oehlsr • Dewmber e, 1993 Ppe2 W A T E R W A S T E~ L A N D • P _ 0 3 • Embankment Conatructlon i At the end of this work period, approximately 40 percent of the 8597 (approximat ) etevatlon lift had been placed. On Wednesday, December 1, SRK's field representative instructed BMRI to abandon its embankment material borrow area and change to a new location sielected by SRK. Both borrow material locations are in the mine pit area. The existing borrow erea could no longer provide suitable materials. The new borrow area is much closer to the original ground surface, significantly less consolidated (o blasting required), and has fewer fines and more sand and gravel. The only potential probl~m with the new borrow area is the depth to which frost had been driven by construction trq~ffic. More effort and thinner lifts have been required during compaction to allow the CAT to break up this material. ' Measured field densities continue to be achieved throughout each lift. Previous lifts are being scarified prior to placement of successive lifts. On Wednesday, December 1, the day and night shifts had to rework approximately 1000 feet of the previous lift to ensure that oversized materials were being broken apart an4nixed with the remaining materials. There was no embankment construction on Sunday or Monday (November 28 or1291 during the day shifts. QUALITY ASSURANCE TESTINQ AND REVIEW • Liner Cover On Wednesday, December 1, I dug one hole in Acre 36 to verify the thickness of liner cover attar placement. I chose an erea which appeared to be thin from observation on the previous day. It appeared to me that the CAT operator was anxious to finish placement. bf the Type 2 material. In the hole I dug, the material was 18 inches thick. I infor~ed SRK's representative and he instructed the contractor to place an additional six inches'of material over an area yet to be determined. SRK informed me that they would verify th~e~liner cover thickness by testing in random Iocations~This,has not yet beer done. After being present during placement of a considerable quantity of the liner cover, I believe the areas with less than 24 inches of cover are rather isolated and may total approximately two acres in aggregate. Miscellaneous Isaues Several times 1 have been able to point out potential problems to SRK personnel b6fore these areas have been covered by the next phase of construction. Although these potential problems may have bean minor in the overall function of the facility, I believe that it was in everyone's interest that they be addressed quickly.