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I ~ ~ W~dward•Ciyde Consultants <br />~~ <br />Climax Molybdenum Company <br />September 22, 1981 <br />Page 3 <br />Our laboratory permeability tests for the Coherex s cimens (see our <br />November 1979 report) showed a general tren tow rA Aecreaa;ne ne~mee bil' v <br />with increasing numbers of Coherex-treated la ers Also, the 0.5 gallons <br />r app ication rate generally resulted in a lower permeability <br />than did the 0.3 gallons per squre yard application rate for the speci- <br />mens tested with the same number of layers. .Permeability rates using an <br />application rate of 0.3 gallons per square yard ranged from 758 feet per <br />year for three treated layers and a 5000 psf'load to 1211 feet per year <br />for one treated layer and a: 1000 psf load. Permeability rates using an <br />application rate of 0.5 gallons per square yard ranged from 440 feet per <br />year for three treated layers and a 5000 psf load to 1099 feet per year <br />for one treated layer and a 1000 psf load. Results of these laboratory <br />permeability tests are also shown in Table I and summarized on Figure 2. <br />Materials having a permeabili <br />(1 x 10 4 cm/sec) are classed <br />Thus, portions of the tailing <br />density and moisture content, <br />classed as "pervious". <br />ty rate of greater than 100 feet per year <br />as "pervious" in soils engineering terms. <br />sand compacted at the above mentioned dry <br />and using the 6 dust suppressants, would be <br />Generally, no problems associated with mixing concentrates and water were <br />observed during our laboratory studies. The only exception to this was the <br />chemical ARCO 2010. This chemical appeared to mix well with water however, <br />when an object was placed in the mixture, a black precipitate would form on <br />it. We discussed this with ARCO and understand best results are achieved <br />when mixing temperatures ,of the concentrate and water are such that the <br />resulting solution temperature is 90°F or greater. Our mixing was per- <br />formed at room temperatures. <br />We experienced no problems storing the solutions in our laboratory, <br />however, all specimens were prepared using fresh mixtures of concentrate <br />and water. <br />During our permeability testing using the Sodium Lignin Sulfonate, we <br />observed the chemical leaching out with the effluent water. we under- <br />stand from Ponderosa Systems, Znc. the chemical is water soluble and can <br />be transported by water. In a natural situation, this movement will occur <br />in a downward direction rather than upward through the sand as was the <br />case during our permeability tests. <br />We cut or split each specimen after each permeability test was completed <br />and examined them to see if any crust could be visually observed. A thin <br />black crust approximately 1/64 to 1/32 of an inch thick was observed for <br />the ARCO 2010. No crust was observed to have formed on any other test <br />specimens. <br />~~~ <br />