2012-08-03_PERMIT FILE - C1981012 (4)

Home Browse Search

April 16, 2012 Page 7 strength determinations of the various materials sampled. Geotechnical laboratory testing performed by Knight Piesold on samples obtained from the DWDA stockpile and borings included the following test procedures as outlined by ASTM (2006):2 • Natural moisture - density determination by ASTM D2216, ASTM D1188 and ASTM D2937 • Gradation (sieve) analysis by ASTM D422 and ASTM D6913 • Atterburg limits determination by ASTM D4318 • Unified Soil Classification System (USCS) based on ASTM D4318 • Maximum dry density and optimum moisture content (OMC) determined by ASTM D698 • Direct shear strength parameters under drained conditions as determined by ASTM D3080 and ASTM D5607 Samples of the sandstone were submitted to AAI's geotechnical laboratory in Grand Junction, Colorado for strength testing. Geotechnical laboratory testing performed by AAI included the point load test described in International Journal of Rock Mechanics and Mining Sciences, "Suggested Method for Determining Point Load Strength" (ISRM 1985),3 Index Testing Table 1 summarizes the results of the index testing. Index testing included particle size analysis, Atterburg limit determination and USCS. Table 1. Summary of Laboratory Index Test Results Sample Sample Plasticity USCS ID Depth Gravel Sand Silt/Clay Index, PI Classification (ft bgs) ( %) ( %) ( %) ( %) BH -38 0 -5 9.9 43.5 46.6 18 Sc BH -38 15 -20 8.6 42.2 48.6 - CL BH -38 11.25 - - - 10 - BH -38 21.25 - - - 14 - BH -39 0 -5 9.6 45.2 45.2 NP SC BH -40 0 -5 - - - 20 - BH -40 5 -10 0.5 27.9 71.6 - CL BH -40 5.75 - - - 14 - BH -41 5 -10 20.1 48.6 31.3 - Sc DWR Stockpile 31.5 45.8 18.4 - SW 2 American Society for Testing and Materials (ASTM) (2006). Annual Book of ASTM Standards, Soil and Rock; Dimension Stone; Geosynthetics, ASTM, Philadelphia, Pennsylvania. s International Society for Rock Mechanics (ISRM), (1985) "Suggested Method for Determining Point Load Strength," Int'l Rock Mech, Min. Sci. and Geomech. Abstr., Vol. 22, No. 2 pp. 51 -60. Agapito Associates, Inc.