2320 CALIFORNIA ST Geotech Report 2025-07-25

SOIL CLASSIFICATION CHART ADDITIONAL MATERIAL SYMBOLS MAJOR DIVISIONS SYMBOLS TYPICAL SYMBOLS TYPICAL GRAPH LETTER DESCRIPTIONS GRAPH LETTER DESCRIPTIONS O�� O WELL-GRADED GRAVELS,GRAVEL- i�\�\ \ CLEAN o Q° ° GW SAND MIXTURES \/\ \ //\ CC Cement Concrete GRAVEL GRAVELS ) ^Q ./\/\// AND D 0 0 POORLY-GRADED GRAVELS,GRAVEL- , GRAVELLY (LITTLE OR NO FINES) o O yD GP SAND MIXTURES SOILS D o D o AC Asphalt Concrete COARSE GRAVELS WITH a ° ° GM SILTY GRAVELS,GRAVEL-SAND-SILT GRAINED MORE THAN 50%OF FINES MIXTURES CR Crushed Rock/ SOILS COARSE FRACTION CR Quarry Spalls RETAINED ON N0.4 SIEVE (APPRECIABLEOFESOUNT A G,G, CLAYEY GRAVELS,GRAVEL-SAND- CIAYMIXTURES TO SOII/ TS Forest Duff/Sod S.W WELLGRADED SANDS,GRAVELLY CLEAN SANDS MORE THAN50% SAND RETAINED ONVE NO. AND • • (LITTLE OR NO FINES) `• 200 SIEVE SANDY SP �0 Y-GRADED SANDS,GRAVELLY SOILS • Measured groundwater level in . _ exploration,well,or piezometer MORE THAN 50%OP SANDS WITH . • SM SILTY SANDS,SAND-SILT MIXTURES Groundwater observed at time of I COARSE FRACTIONNO.ION FINES exploration PASSING NO.4 SIEVE (APPRECIABLE AMOUNT SC CLAYEY SANDS,SAND-CLAY OF FINES) /% MIRES Perched water observed at time of exploration 111 INORGANIC SILTS,ROCK FLOUR, — mi. PLASSTICSILTSPLASTICITY WITH wsLiGHr e Measured free product in well or INORGANIC CLAYS OF LOW TO piezometer SILTS r MEDIUMPLASTICITY,GRAVELLYAND LIQUID LIMITCL CLAYS,SANDY CLAYS,SILTY CLAYS, Graphic Loci Contact FINE LESS THAN 50 LEAN CLAYS i GRAINED CLAYS Distinct contact between soil strata or SOILS ORGFWICSILZISTII NICSILTY geologic units OL CLAYS OF Low PLASTICTY INORGANIC SILTS,MICACEOUS OR Approximate location of soil strata PASSSINGSING NO. O.200 M 50% I I I I MH DIATOMACEOUS SILTY SOILS change within a geologic soil unit SIEVE //J 1 SILTS LIQUID LIMIT / / INORGANIC CLAYS OF HIGH Material Description Contact CLAYS AND GREATER THAN 50 / / CH PLASTICITY f f Distinct contact between soil strata or " I AMA OH ORGANIC CLAYS AND SILTS OF _--_ geologic units MEDIUM TO HIGH D SILTS O .�I ti.�l+� Approximate location of soil strata HIGHLY ORGANIC SOILS _ _ PEAT HUMUS,SWAMPSOILS WITH change within a geologic soil unit _— HIGH ORGANIC CONTENTS I NOTE: Multiple symbols are used to indicate borderline or dual soil classifications Laboratory/Field Tests Sampler Symbol Descriptions %F Percent fines AL Atterberg limits I II 2.4-inch I.D.split barrel CA Chemical analysis CP Laboratory compaction test 1 Standard Penetration Test(SPT) CS Consolidation test DS Direct shear ■ Shelby tube HA Hydrometer analysis I MC Moisture content Piston MD Moisture content and dry density OC Organic content 1110 Direct-Push PM Permeability or hydraulic conductivity PP Pocket penetrometer I Bulk or grab SA Sieve analysis TX Triaxial compression UC Unconfined compression VS Vane shear Blowcount is recorded for driven samplers as the number I of blows required to advance sampler 12 inches(or Sheen Classification distance noted). See exploration log for hammer weight NS No Visible Sheen and drop. SS Slight Sheen A"P"indicates sampler pushed using the weight of the MS Moderate Sheen drill rig. HS Heavy Sheen NT Not Tested I NOTE: The reader must refer to the discussion in the report text and the logs of explorations for a proper understanding of subsurface conditions. Descriptions on the logs apply only at the specific exploration locations and at the time the explorations were made;they are not warranted to be representative of subsurface conditions at other locations or times. 111 KEY TO EXPLORATION LOGS GE®ENGlNEERS FIGUREA-1