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~~ <br />• FOUNDATIONS AND CONSTRUCTION MATERIALS <br />'O° Adapted from "Supplement to Soil Classification <br />System (7th Approzimation)~' SCS, <br />90 USDA, Second Printing, March, 1967 <br />R <br />eo <br />ro <br />lay <br />~ 4 <br />so ° <br />e <br />of ?• <br />4 ? J <br />ti` t <br />v ~ <br />~ S~Ify <br />Q° Sandy Clay <br />[lay <br />eo <br />illy cloy <br />Clay loam loom ,~o <br />b <br />Andy clay loam <br />0 <br />So <br />oam <br />Silt loam <br />0 <br />Sandy loom <br />to <br />Darcy <br />San sand Silt o <br />c b ~o '° °o '6 'o °o •'0 0 <br />Percent sand <br />COMPARISON OF PARTICLE-SIZE SCALES <br />Sieve Openillj• in Inches U. S. Staldrd Swre Numbre <br />7 2 1 In 1 n /n ~ e + 10 20 +0 60 100 <br />USDA GRAVEL eft SAND er/ SILT CLAY <br />Coer» Coaru Wliew fine /In• <br />UNIFIED GRAVEL SAND SILT OR CLA7 <br />Coeru floe Ceane Yeeiue fine <br />4A511T0 GRAVEL OR STONE SAND SILT-CLAY <br />Coera• Yrfluw fine Coerre floe Silt Cley <br />1111 I I5 1 1 I II I I 15 1 1 I o. 0.u o 1s o~I I~ s o~oz o oI o~aos o ooi o 00 <br />Gain Sise in Nllllmelen 0.07+ •••-••••••^••~••• •• ~••• <br />Figure 5.4.-Soil Irlangle of the basic soil 19:aural classes. IU.s. Soil Conservation Ser- <br />vicel. 288-D-2782. <br />83 <br />I <br />~~ <br />i <br />i <br />I <br />ill <br />r <br />