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June 28, 1995 <br />Page 4 <br />quarter. There is no indication in the report that this test was <br />completed. EFCI has committed to doing two compaction tests at <br />random locations on each active fill bench. Considering the total <br />active area of the pile, I believe that two samples are inadequate. <br />However, I would defer to an engineer to determine how many density <br />tests were needed for that engineer to certify that the pile is a <br />stable construction. <br />Ouestion: Was a compaction test on the refuse pile completed <br />during the first quarter 1995, as committed to in Appendix B, <br />Compaction Testing Program, of Exhibit 18? If so, please <br />provide an addendum to the quarterly report which indicates <br />this test was completed and the results of the test. <br />Ouestion: EFCI should revise the Compaction Testing Program <br />to commit to performing compaction testing each time a lift is <br />completed and to the submittal of the test results to the <br />Division on a quarterly basis. <br />Ouestion: EFCI should provide verification that two <br />compaction tests on an active bench is adequate to determine <br />the stability of the refuse pile. <br />/* From review of the violation that was written regarding the pile <br />construction and subsequent correspondence to abate the violation, <br />which now appears in Exhibit 18, I assumed that the question of the <br />stability of the pile at a 1:1 coarse to fine refuse material and <br />the plasticity values of the material had been answered. However, <br />in the current quarterly report and previous reports the engineer <br />performing the inspection recommends that, "Variation in the <br />characteristics of the coarse and fine refuse materials are to be <br />expected, depending on changes in the mine geology and mining <br />practices. The fine material should be sampled and tested to <br />identify an acceptable range of plasticity characteristics. When <br />high clay content material is encountered in the mining operations, <br />it should be sampled and compared with this range, with selective <br />placement of high plasticity materials in the pile to avoid adverse <br />stability impacts." This recommendation indicates that there is <br />still a question regarding placement of refuse material in the <br />pile, which further enforces the need to complete compaction tests <br />each time a lift is constructed. <br />Ouestion: EFCI should comment on Mr. Brent's recommendations. <br />