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KEY TO BORING LOGS MAJOR TYPES DESCRIPTION a o GRAVELS CLEAN GRAVELS WITH • GW-Well graded gravels or gravel-sand mixtures W MORE THAN HALF LESS THAN 5%FINES GP - Poorly graded ravels ravel-sand mixtures W z oory g g or COARSE g o= ARE FRATIN IS LARGER THAN GM - Silt ravels, gravel-sand and silt mixtures u)W y g NO.4 SIEVE SIZE GRAVELS WITH OVER o(D> 12%FINES GC - Clayey gravels, gravel-sand and clay mixtures QW z MORE THAN HALF CLEAN SANDS WITH SNDS SW-Well graded sands, or gravelly sand mixtures COARSE FRACTION LESS THAN 5%FINES LL IS SMALLER THAN y g gravelly SP- POOCI graded sands or ravel) sand mixtures c� uw)oLL NO.4 SIEVE SIZE a Q SANDS WITH OVER SM -Silty sand, sand-silt mixtures °= 12%FINES SC - Clayey sand, sand-clay mixtures W w ML - Inorganic silt with low to medium plasticity O Q SILTS AND CLAYS LIQUID LIMIT 50%OR LESS 2 2 W CL- Inorganic clay with low to medium plasticity WU)> =J_j oQ o — OL- Low plasticity organic silts and clays co opo Z 0U_ MH - Elastic silt with high plasticity SILTS AND CLAYS LIQUID LIMIT GREATER THAN 50% CH - Fat clay with high plasticity Z= OH - Highly plastic organic silts and clays HIGHLY ORGANIC SOILS PT- Peat and other highly organic soils For fine-grained soils with 15 to 29%retained on the#200 sieve,the words"with sand"or"with gravel"(whichever is predominant)are added to the group name. For fine-grained soil with>30%retained on the#200 sieve,the words"sandy"or"gravelly"(whichever is predominant)are added to the group name. STANDARD 11 40 10 SILTS SAND GRAVEL AND FINE MEDIUM COARSE FINE COARSE ��] COBBLES BOULDERS CLAYS RELATIVE DENSITY CONSISTENCY SANDS AND GRAVELS BLOWS/FOOT SILTS AND CLAYS STRENGTH* (S.P.T.) VERY SOFT 0-1/4 VERY LOOSE 0-4 SOFT 1/4-1/2 LOOSE 4-10 MEDIUM STIFF 1/2-1 MEDIUM DENSE 10-30 STIFF 1-2 DENSE 30-50 VERY STIFF 2-4 VERY DENSE OVER 50 HARD OVER 4 MOISTURE CONDITION SAMPLER SYMBOLS DRY Dusty,dry to touch MOIST Damp but no visible water Modified California(3"O.D.)sampler WET Visible freewater e California(2.5"O.D.)sampler LINE TYPES S.P.T. - Split spoon sampler IEShelby Tube Solid - Layer Break ® Dames and Moore Piston Dashed - Gradational or approximate layer break Continuous Core GROUNDWATER SYMBOLS ElBag Samples Groundwater level during drilling IN 1 Grab Samples Stabilized groundwater level NR No Recovery F (S.P.T.)Number of blows of 140 Ib.hammer falling 30"to drive a 2-inch O.D. (1-3/8 inch I.D.)sampler ENGEO Unconfined compressive strength in tons/sq.ft.,asterisk on log means determined by pocket penetrometer Expect Excellence