Using the Unified Soil Classification System definitions, what percentage of the soil is: a) gravel b) sand c) silt d) clay e) peat LAB RESULTS: Percentage of soil determined to be coarse- or fine- grained rock-based particles = 95.6% LL = 37, PL = 16 Sieve Size Percent Finer No. 4 98.0 No. 10 82.3 No. 30 65.1 No. 60 55.8 No. 100 38.6 No. 200 34.5 No. 325 21.6 No. 400 18.4 Unified Soil Classification System Coarse-Grained Soils - more than 50% retained on a No. 200 sieve Fine-Grained Soils - 50% or more passes a No. 200 sieve Gravel - material passes a 3-in sieve and is retained on a No. 4 sieve Sand - material passes a No. 4 sieve and is retained on a No. 200 sieve Silt - material passes a No. 200 sieve and is non-plastic (PI<4) Clay - material passes a No. 200 sieve and exhibits plasticity (PI>4) Peat - soil of vegetable matter