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Geological Landscape Section Summary 2024 Layer Depth (inches)Soil Texture AASHTO Group Unified Soil Description SaturatedHydraulicConductivity micro m/sec Soil Reaction pH 1 0-20 Loamy sand Reference: This is a classification of soil material for highway and airfield construction (Procedure M 145-73 in Am. Assoc. of State Highway and Transportation Officials, 1984. mm, the liquid limit, and the plasticity index and on whether the soil material is high in organic matter (ASTM test D 2487, in ASTM, 1984). 14.11-141.14 5.1-7.8 2 20-28 Loamy sand Reference: This is a classification of soil material for highway and airfield construction (Procedure M 145-73 in Am. Assoc. of State Highway and Transportation Officials, 1984. COARSE-GRAINED SOILS, Sands, Sands with fines, Silty Sand. Reference: This is a classification of soil material designed for general construction purposes. It is dependent on the particle size distribution of the <75 mm, the liquid limit, and the plasticity index and on whether the soil material is high in organic matter (ASTM test D 2487, in ASTM, 1984). 14.11-141.14 5.1-7.8 3 28-84 Coarse sand Reference: This is a classification of soil material for highway and airfield construction (Procedure M 145-73 in Am. Assoc. of State Highway and Transportation Officials, 1984. Reference: This is a classification of soil material designed for general construction purposes. It is dependent on the particle size distribution of the <75 mm, the liquid limit, and the plasticity index and on whether the soil material is high in organic matter (ASTM test D 2487, in ASTM, 1984). 14.11-423.3 5.6-7.8 4 84-160 Coarse sand Reference: This is a classification of soil material for highway and airfield construction (Procedure M 145-73 in Am. Assoc. of State Highway and Transportation Officials, 1984. COARSE-GRAINED SOILS, Sands, Clean Sands, Poorly Graded Sand. Reference: This is a classification of soil material designed for general construction purposes. It is dependent on the particle size distribution of the <75 mm, the liquid limit, and the plasticity index and on whether the soil material is high in organic matter (ASTM test D 2487, in ASTM, 1984). 42.34-705 7.4-8.4 5 160-200 Coarse sand Reference: This is a classification of soil material for highway and airfield COARSE-GRAINED SOILS, Sands, Clean Sands, Poorly Graded Sand. Reference: This is a 42.34-705 7.4-8.4 Page 498 of 890