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9/30/93 <br />Responses to Comments <br />San Luis Reclamation Evaluation Report <br />Page 15 <br />feet of the liner. Based on the discussion included <br />in this comment, the upper disposal area sampling is <br />adequate. <br />The holes which were sampled in the lower area also <br />represent the entire column. Hole 8 went <br />approximately 15 inches into the AVR deposited <br />tailings, Hole x`12 went approximately 22 inca-es into <br />the AVR tailings, and Hole X13 went approximately 24 <br />inches into the AVR tailings. These samples should <br />provide a good indication of the effect of both SOZ <br />treatment and CYTOX on the AVR treated tailings. As <br />previously discussed, the upper area tailings <br />samples should provide a good indication of the <br />behavior of the AVR tailings alone. Here again only <br />the standing water pool was treated with hydrogen <br />peroxide. Table 1 is included with this submittal <br />and shows the approximate depths and which tailings <br />technique (AVR, CYTOX, INCO) is reflected at that <br />depth for each hole. The table was developed based <br />on the surveyed top of hole elevations included on <br />the auger logs and the elevation of deposition for <br />each treatment shown on Figure 2.2. <br />BMRI believes that the samples adequately represent <br />the full range of treatments to which the tailings <br />were subjected. However, since sampling of tailings <br />at depth appears to be an ongoing concern, BMRI <br />collected additional samples at depth during the <br />week of September 20th utilizing vibra core sampling <br />techniques as discussed above. <br />