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:z <br />M~ . <br />Using the ratios above, and the average chemical and physical data for each soil sample, the <br />following particle size distribution can be derived; <br />27% Sand, 40% Silt and 33% Clay <br />Please note that this is an estimate of the particle size distribution based on the data and <br />soils map in the Colowyo permit. If Colowyo wants to use the data in the permit for <br />estimating particle size, the numbers noted above (27% Sand, 40% Silt and 33% Clay) <br />should be adequate for the SEDCAD+ models. However, a more accurate result for the <br />model would be to sample the various soils within each watershed to estimate an eroded <br />particle size distribution. <br />If you have any questions, please do not hesitate to call. <br />Sincerely, <br />iy ~, <br />`~ <br />Erica S. Crosby <br />Environmental Protection Specialist <br />cc: Juan Garcia w/ Colowyo Coal Co. <br />Larry Routten <br />c: \wp51 \colowyo \970106 <br />