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Kennedy/Jenks Consultants <br /> procedure also applies to soils and sediments collected using other techniques(e.g., post hole <br /> digger, scoop, Van Veen sampler, and backhoe). <br /> The USCS categorizes soils into 15 basic groups, each with distinct geologic and engineering <br /> properties. The following steps are required to classify a soil sample: <br /> 1. Observe basic properties and characteristics of the soil. These include grain-size grading <br /> and distribution and influence of moisture on fine-grained soil. <br /> 2. Assign the soil a USCS classification and denote it by the standard group name and symbol. <br /> 3. Provide a written description to differentiate between soils in the same group, if necessary. <br /> Many soils have characteristics that are not clearly associated with a specific soil group. These soils <br /> might be near the borderline between groups, based on either grain-size grading and distribution, or <br /> plasticity characteristics. In this case, assigning dual group names and symbols might be <br /> appropriate (e.g., GW/GC or ML/CL). <br /> The three basic soil groups are: <br /> 1. Coarse-Grained Soils— For soils in this group, more than half of the material is larger than <br /> No. 200 sieve (0.074 mm). <br /> 2. Fine-Grained Soils— For soils in this group, one half or more of the material is smaller than <br /> No. 200 sieve (0.074 mm). <br /> 3. Highly Organic Soils—This group includes soils with high organic content, such as peat. <br /> Note: No. 200 sieve is the smallest size that can be seen with the naked eye. <br /> C.4.2 Classification of Coarse-Grained Soils <br /> Coarse-grained soils are classified on the basis of: <br /> 1. Grain size and distribution <br /> 2. Quantity of fine-grained material (i.e., silt and clay) <br /> 3. Character of fine-grained material <br /> Classification uses the following symbols: <br /> Basic Symbols Modifying Symbols <br /> G -gravel W -well graded <br /> S- sand P - poorly graded <br /> M -with silt fines <br /> C -with clay fines <br /> Page 2 Soil Investigation Work Plan, <br /> BNSF Mormon Yard, Stockton, California <br /> A:t'sgouplatlmin�job\13113850f0.00_bnsMB+eporlslsoiNnvas4vwk-planWppc_mgborehokbAAing.Coc <br />