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1 • ~ <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 />~, 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 />s 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 />c tests be conducted during manufacturing of the material to help <br />1 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 />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 />E Based on the results of the sodium sulfate soundness tests and <br />the Los Angeles Abrasion tests it is our opinion that the material <br />~_ likely may be quarried and crushed to manufacture concrete <br />aggregate and road base aggregate. <br />1 .. <br />The material appears to contain significant minus number 200 <br />~ 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 />Lambert ana ~,ooociate,~ <br />CONSULTING GEO TEC HNICAL ENGINEERS AND <br />i; MATERIAL TESTING <br />