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e <br /> M00079GE <br /> 4/20/2000 <br /> Page Two <br /> Formational Mancos Shale was encountered in the bottom of test <br /> hole 1 at a depth of about twenty-six (26) feet below the original <br /> ground surface, based on observations of the quarry excavation cut <br /> face. <br /> No free subsurface water was encountered in the test holes at the <br /> time of our field study. We anticipate that the free subsurface <br /> 4 water elevation may fluctuate with seasonal and other varying <br /> conditions. <br /> Our laboratory study included tests to help identify the <br /> suitability for use of the material for manufacturing aggregate <br /> base course material and concrete aggregate. Our laboratory study <br /> included Los Angeles Abrasion tests, sodium sulfate soundness <br /> tests, and specific gravity tests of select samples of the sand and <br /> gravel material obtained during our field study. <br /> We did not perform Atterberg Limits tests or sieve analysis tests <br /> because the Atterberg Limits and the sieve analysis will likely be <br /> 1 largely influenced by the amount of overburden soils blended with <br /> the material and the crushing operations. We suggest that these <br /> tests be conducted during manufacturing of the material to help <br /> identify the crushing and blending required to manufacture material <br /> with the desired material grading. The results of the laboratory <br /> tests are presented on Figures 10 and 11 . <br /> The results of the sodium sulfate tests indicate a non-weighted <br /> total loss of 6 .2 percent and 3 .4 percent for the two samples <br /> I - tested. AASHTO, State of Colorado Department of Transportation and <br /> ASTM recommend a loss of less than 12 percent for aggregate to be <br /> used for concrete aggregate. <br /> • The results of the Los Angeles Abrasion test indicates a total <br /> loss of 18 .5 and 18 .9 percent after 500 revolutions for the two (2) <br /> samples tested. AASHTO, State of Colorado Department of <br /> Transportation and ASTM recommend a maximum loss of 50 percent for <br /> aggregate to be used for concrete and road base. <br /> Based on the results of the sodium sulfate soundness tests and <br /> 1 • the Los Angeles Abrasion tests it is our opinion that the material <br /> likely may be quarried and crushed to manufacture concrete <br /> 171 aggregate and road base aggregate. <br /> The material appears to contain significant minus number 200 <br /> 1` 1 sieve size material. It may be necessary to screen or wash the <br /> material to provide sufficiently clean aggregate for concrete. The <br /> Atterberg Limits and percent passing a number 200 sieve for road <br /> I <br /> i <br /> Lambert ana g,000ciateo <br /> CONSULTING GEOTECNNICAL ENGINEERS AND <br /> I. MATERIAL TESTING <br /> I <br />