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is <br />Clayton Group Servicte Page4 <br />Standard Operating Procedure <br />SOP -12 - Unified Soil Classification System <br />5. When fine-grained soils plot on the liquid limit (LL) borderline (50), the symbol for <br />the lower liquid comes first (for example ML -MH, CL -CH, OL -OH). <br />6. Soils that fall on the border between fine- and coarse-grained constituents, the symbol <br />is SM -ML, SC -CL, GM -ML, or GC -CL. <br />S:\Ermr\Proj\SOPS\SOP- l 2. doc <br />