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Daniels Sand Pit 2,Permit M-1973-007-SG; <br /> Response to"Approval Succession of Operators,Revision SO-2,with Stipulations" <br /> Page 10 <br /> APPENDIX B <br /> 1 SUMMARY OF PREVIOUS INVESTIGATIONS <br /> Previous investigations of the Daniels Sand Pit have been performed by Lyman Henn and <br /> Brierley Associates. These investigations were used to determine the slope parameters for the <br /> slope stability analysis. <br /> 1.1 LYMAN HENN- 2005 <br /> Lyman Henn, Inc. (predecessor to Brierley Associates)was retained by Transit Mix Concrete <br /> Company to conduct a geotechnical engineering investigation for the proposed Daniels Sand <br /> Drying Facility. Borings LH-A, B, and C were extended to depths of 26, 40 and 50.2 ft <br /> respectively below existing grade. The materials encountered include alluvial sands and gravels. <br /> 1.1.1 Coarse Alluvium (SP, SW, SM, SW/SM,ML,CL) <br /> Coarse alluvium consisting of poorly and well graded sand, silty sand, and well graded sand <br /> with silt was encountered in each of the three borings. The top of the stratum was encountered at <br /> the ground surface and ranged from approximately 25.5 to 31 feet thick. Occasionally, lenses of <br /> sandy silt as thick as 5 feet were encountered. This material was moist to wet and medium to <br /> very dense with standard penetration tests ranging from 10 to 79 blows per foot. <br /> 1.2 LYMAN HENN-2006 <br /> 1.2.1 Test Borings and Rock Coring <br /> Lyman Henn completed 20 test borings along or near the proposed slurry wall alignment to <br /> characterize subsurface conditions. Test borings revealed alluvial soils overlying sedimentary <br /> bedrock. The alluvial soils consist of a fine alluvium (overburden) extending from the ground <br /> surface to depths ranging from 2 ft to 20 ft below ground surface(bgs)and coarse alluvium (sand <br /> and gravel) extending below the fine alluvium to the top of bedrock. Overburden was <br /> encountered in all of the borings. The depth to the top of bedrock ranged from 31 to 44 ft bgs, <br /> with an average depth of 36 ft bgs. Bedrock elevations ranged from 4577 to ft to 4584 ft. The <br /> overburden consists primarily of lean clay. The sand and gravel consisted of clayey sand with <br /> gravel and poorly graded sand. <br /> Sample Location Sample Atterberg <br /> -200 Limits <br /> Depth Moisture % LL PI <br /> USCSI Soil Description <br /> De <br /> Boring No. (feet) (%) ( ) % % <br /> 0 0 <br /> Bulk Fill 7 98 43 23 CL lean CLAY <br /> Bulk OB 9 79 35 18 CL lean CLAY <br /> Clay <br /> LH-10 0-1 11 86 42 20 CL lean CLAY <br /> S/G 5 17 21 7 SC clayey SAND with <br /> avel <br /> LH-4 24-25.5 11 3 NV NP SP poorly graded SAND <br /> BRIERLEY <br /> ASSOCIATES <br /> Creating Space Underground <br />