Stormwater Management Report Revised as of 01282026 4936 0314 8685 v2

FIELD SOIL CLASSIFICATION SYSTEM PARTICLE SIZE IDENTIFICATION COHESIONLESS SOIL (Gravel, Sand, Silt and Combinations) Boulders 8 inch diameter or greater DENSITY Cobbles 3 to 8 inch diameter Very Loose 05 blows I ft or less Gravel Coarse -- 1 to 3 inch Loose 06 to 10 blows / ft Medium -- 1/2 to 1 inch Medium Dense .. ...11 to 30 blows / ft Fine -- 4.75 mm to 1/2 inch Dense 31 to 50 blows / ft Sand Coarse -- 2.0 mm to 4.75 mm Very Dense .. 51 blows / ft or more (dia. of pencil lead) Medium -- 0.425 mm to 2.0 mm (dia. of broom straw) COHESIVE SOIL Fine -- 0.075 mm to 0.425 mm (Clay Silt and Combinations) (dia. of human hair) Silt &Clay Smaller than 0.075 mm CONSISTENCY Very Soft 01 blow / ft or less Soft 02 to 4 blows / ft Medium Stiff 05 to 8 blows / ft RELATIVE PORTIONS Stiff 09 to 15 blows / ft Descriptive Term Percent Very Stiff 16 to 30 blows / ft Trace - tr 1 - 10 Hard 31 blows / ft or greater Some - sm 11 - 20 Adjective - ly 21 - 35 And - & 36 - 50 ROCK R.Q.D. Rock Quality 00 — 25... ... Very Poor 25 - 50% Poor 50 - 75% Fair ABBREVIATIONS 75 - 90% Good Bn -Brown 90 - 100% Excellent Gy -Gray Blk -Black Rd -Red Or -Orange HSA -Hollow Stem Auger BI -Blue SS- Split Spoon Sampler Lt -Light Coarse grained - c WOR -Weight of Rods Dk -Dark Medium grained - m WOH -Weight of Hammer Multi -Multi colored Fine grained- f

lit Spoon Sampler Lt -Light Coarse grained - c WOR -Weight of Rods Dk -Dark Medium grained - m WOH -Weight of Hammer Multi -Multi colored Fine grained- f NR - No Recovery of Sample