Stormwater Management Report 4898 2292 85031

FIELD SOIL CLASSIFICATION SYSTEM PARTICLE SIZE IDENTIFICATION Boulders......8 inch diameter or greater Cobbles.......3 to 8 inch diameter Gravel Coarse -- 1 to 3 inch Medium -- 1/2 to 1 inch Fine -- 4.75 mm to 1/2 inch Sand... Coarse -- 2.0 mm to 4.75 mm (dia. of pencil lead) Medium -- 0.425 mm to 2.0 mm (dia. of broom straw) Fine -- 0.075 mm to 0.425 mm (dia. of human hair) Silt & Clay... Smaller than 0.075 mm RELATIVE PORTIONS Descriptive Term = Percent Trace - tr Me Some - sm . 11-20 Adjective - ly . 21-35 And- & .... . 36 - 50 ABBREVIATIONS Bn - Brown Gy - Gray Bik - Black Rd - Red Or - Orange BI - Blue Lt- Light Dk - Dark Multi - Multi colored Coarse grained - c Fine grained- f Medium grained - m COHESIONLESS SOIL (Gravel, Sand, Silt and Combinations) DENSITY 05 blows | ft or less 16 to 10 blows / ft .11 to 30 blows / ft 31 to 50 blows / ft -51 blows / ft or more Medium Dense . Dense Very Dense COHESIVE SOIL (Clay Silt and Combinations) CONSISTENCY . .01 blow/ ft or less 02 to 4 blows / ft .05 to 8 blows / ft 09 to 15 blows / ft 16 to 30 blows / ft 31 blows / ft or greater R.Q.D. Rock Quality Very Poor 50-75% . 75 - 90% 90 - 100%.. HSA - Hollow Stem Auger SS- Split Spoon Sampler WOR - Weight of Rods WOH - Weight of Hammer NR - No Recovery of Sample