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Custom Soil Resource Report <br />Engineering Properties– Arapaho - Roosevelt National Forest Area, Colorado, Parts of Boulder, Clear Creek, Gilpin, Grand, Park and Larimer Counties <br />Map unit symbol and <br />Pct. of <br />Hydrolo <br />Depth <br />USDA texture <br />Classification <br />Fragments <br />Percentage passing sieve number— <br />Liquid <br />Plasticit <br />soil name <br />map <br />gic <br />limit <br />y index <br />unit <br />group <br />Unified <br />AASHTO <br />>10 <br />3 -10 <br />4 <br />10 <br />40 <br />1 200 <br />inches <br />inches <br />In <br />Pct <br />Pct <br />Pct <br />2705D— Ratake- <br />Cathedral families - <br />Rock outcrop <br />complex, 40 to 150 <br />percent slopes <br />Ratake family <br />50 <br />D <br />0 -8 <br />Very gravelly sandy <br />GC -GM, <br />A -2 -4, <br />0 -12 <br />7 -18 <br />39 -64 <br />36 -63 <br />27 -53 <br />11 -26 <br />22 -33 <br />4 -12 <br />loam <br />GC <br />A -1 -b, <br />A -1 -a <br />8 -18 <br />Very gravelly sandy <br />GC, GC- <br />A -2 -4, <br />0 -11 <br />7 -17 <br />36 -58 <br />33 -56 <br />24-46 <br />11 -25 <br />20 -31 <br />4 -12 <br />loam, extremely <br />GM <br />A -1 -a, <br />stony coarse <br />A -1 -b <br />sandy loam <br />18 -28 <br />Bedrock <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />Cathedral family <br />20 <br />D <br />0 -0 <br />Slightly decomposed <br />PT <br />A-4 <br />0 <br />0 <br />100 <br />100 <br />60 -100 <br />50 -90 <br />— <br />— <br />plant material <br />0-6 <br />Very stony sandy <br />SC -SM, <br />A -2 -4, <br />7 -13 <br />13 -31 <br />48 -74 <br />46 -73 <br />33 -63 <br />15 -34 <br />18 -34 <br />2.13 <br />loam <br />SC, SM <br />A -1 -b, <br />A -2 -6 <br />6 -11 <br />Extremely stony <br />GC -GM, <br />A -1 -b, <br />19 -27 <br />19 -32 <br />31 -64 <br />28 -63 <br />19 -52 <br />8 -28 <br />16 -31 <br />2 -13 <br />sandy loam, very <br />GC, GP- <br />A -2 -6, <br />cobbly sandy loam <br />GM <br />A -2 -4 <br />11 -17 <br />Extremely stony <br />GP -GC, <br />A -1 -a, <br />19 -38 <br />19 -32 <br />31 -63 <br />28 -61 <br />18-49 <br />6 -22 <br />16 -30 <br />2 -13 <br />sandy loam <br />GP -GM, <br />A -2 -4, <br />GC <br />A -2 -6 <br />17 -26 <br />Bedrock <br />— <br />— <br />— <br />— <br />— <br />Rock outcrop <br />15 <br />0 -60 <br />Bedrock <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />— <br />24 <br />