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<br />, <br /> <br />. <br /> <br />. <br /> <br />3, The Davidson prospect near Elevenmile Canyon Reservoir at the <br />southeast end of South Park. <br />4, The Silver-Rocker (Lamberg) claim near Howard; <br /> <br />The several prospects below Pueblo, including the bentonite south of <br />Las Animas, have not as yet been sampled for the current test program. <br /> <br />In the past, the Wyoming high-swell bentonite has been considered as <br />the standard, and the amount of swell of a bentonite has been used as an evalua- <br />tion yard stick. Since most of the Colorado bentonites fall into a low-swell <br />class, they have commonly been eonsidered as unsuitable for eanal and <br />reservoir sealing purposes. Recent experience with the Colorado bentonites, <br />such as the Lamberg bentonite, proves that it is possible to obtain good sealing <br />results with the low-swell clays. Thus, new evaluation standards are needed. <br /> <br />The bentonites from the District area, and frcnn other areas in <br />Colorado as well, will be evaluated in two ways. First, the bentonites will <br />be put through an extensive laboratory test program at the University. This <br />work will be started June 13, 1960, when the personnel becomes available. <br />Secondly, these results will be compared with the sealing results actually <br />obtained in field installationuincluding all past experience we ean find, plus <br />the new results obtained by project evaluations at new trial installations. <br /> <br />The laboratory tests that tie in best with the aetual field trial results <br />will be reeommended as evaluation tests, and minimum standards of quality <br />using these tests will also be recommended. The latter information is an <br />urgent need at the present time. For example in the Canon City-Salida area <br />bentonite(?) or elay materials from three pits are being considered for pond <br />and ditch sealing work under the ACP program, One of the materials, the <br />Silver- Rocker bentonite, has been used successfully for diteh and reservoir <br />sealing for several years, The other two mll.terials, the Fox-Dilley and <br />Kessler materials, appear favorable but as yet no extensive installation <br />experience has been aceumulated for these latter materials. <br /> <br />-2- <br /> <br />1009 <br />