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<br />. <br /> <br />. <br /> <br />- 3 - <br /> <br />The colloidal yield, grit and lime tests are to be run <br />on all samples brought to the project laboratory. From these <br />samples, a representative set of about 15 samples has been <br />selected for testing in addition to the above. The detailed <br />testing program will include these additional tests: perme- <br />ability, swellability, wetability, stability against erosion, <br />liquid limit, plastic limit, shrinkage limit, specific gravity, <br />chemical characteristics (total exchange capacity, cation <br />exchange capacity, etc.) and x-ray diffraction analysis. <br />It is expected that the detailed testing program when <br />correlated to the field trial results will reveal those tests <br />that are most meaningful from a practical canal and reservoir <br />sealing viewpoint. <br /> <br />FIELD TRIALS <br /> <br />Only limited field trial activities are being carried <br />on at this stage of the project program. The clay or bentonite <br />samples need to be evaluated before trial activities in canals <br />and reservoirs can be initiated on a large scale. <br />In some areas, however, bentonites with a favorable past <br />experience record are available. The Silver-Rocker bentonite <br />(Lamberg) from Howard is one such bentonite. Numerous instal- <br />lations with this bentonite have been made in the Salida- <br />Buena Vista-Gunnison-Moffat area during the past year. <br /> <br />1016 <br />