202 ALDER ST Geotech Report 2025-07-30 (2)

;�° Weil graded gravel and Terms Describing Relative Density and Consistency a N$°$°,OW gravel with sand, little to Density SPT(2)blows/foot u_ y W o c no fines Coarse- Very Loose 0 to 4 co soLoose 4 to 10 > O > _°o°o o Poorly-graded gravel Grained Soils 2 U°J Vl 0°0 g 0 GP Medium Dense 10 to 30 Test Symbols w ooand gravel with sand, Dense 30 to 50 Y c v 00000 o . d o 0 0 0 0 little to no fines Very Dense >50 G =Grain Size N Z o o Zo 0 t�1 M=Moisture Content 6 o c .0°( Consistency SPT blows/foot A=Atterberg Limits c .0 )o c Silty gravel and silty Very Soft 0 to 2 C=Chemical w c U, c o o( GM gravel with sand Fine- Soft 2 to 4 DD=Dry Density II c m •' ii,)W, Grained Soils Medium Stiff 4 to 8 K=Permeability So 2 a orail,' Stiff 8 to 15 re m r .. Clayey gravel and Very Stiff 15 to 30 Nl �:' GC clayey gravel with sand Hard >30 to CO ��' Component Definitions L o Well-graded sand and Descriptive Term Size Range and Sieve Number ▪ •0 -: .:.:i sw sand with gravel,little Boulders Larger than 12" ri @: ::1 to no fines Cobbles 3"to 12" Poorly-graded sand Gravel 3 to No.4(4.75 mm) a ‘Al y-g Coarse Gravel 3 to 3/4" rn c)•— SP and sand with gravel, Fine Gravel 3/4"to No.4(4.75 mm) a o little to no fines Sand No.4(4.75 mm)to No.200(0.075 mm) c2 Z - Coarse Sand No.4(4.75 mm)to No.10(2.00 mm) at k- m— - Silty sand and Medium Sand No.10(2.00 mm)to No.40(0.425 mm) c .-:: - SM silty sand with Fine Sand No.40(0.425 mm)to No.200(0.075 mm) u.. gravel Silt and Clay Smaller than No.200(0.075 mm) 2 Y SC Clayey sand and -(3)Estimated Percentage Moisture Content can Ali clayey sand with gravel DryAbsence of moisture, Percentage by Component Weight dusty,dry to the touch Silt,sandy silt,gravelly silt, Trace <5 Slightly Moist-Perceptible Few 5 to 10 moisture > u• oi PAL silt with sand or gravel Little 15 to 25 Moist-Damp but no visible r�n T as With Non-primary coarse water o — to (jCL Clay of low to medium constituents: > 15°k Very Moist Water visible but z plasticity;silty,sandy,or -Fines content between not free draining - m•— gravelly clay, lean clay 5%and 15% Wet-Visible free water,usually co E ::5 _ from below water table ti cr = Organic clay or silt of low Symbols - OL plasticity Blows/6"or M _= Sampler portion of 6" `� ` __ �G \Cement grout o Type >Y surface seal Elastic silt,clayey silt,silt 2 0"OD / Sampler Type with micaceous or % +: Description Bentonite o y MH Split-Spoon a z. J seal diatomaceous fine sand or Sam ler °p 113.0 OD Split-Spoon Sampler -:; ...4:Filter pack with .o m o silt (SPT) ' 3.25"OD Split-Spoon Ring Sampler t<) •. :::blank casing o Clay of high plasticity, section SZ=•". a) c to CH sandy or gravelly clay,fat Bulk sample 3.0"OD Thin Wall Tube Sampler —cti or Hydrotip .o A� Grab Sample V with filter pack t ''5 ,':1/� _.-End cap LL J /0/// Organic clay or silt of Q Portion not recovered ;��,,/, OH medium to high to i/i.i�� Percentage by dry weight (4) Depth of ground water i.%i�.; plasticity (2) (SPT)Standard Penetration Test p :t t ATD=At time of drilling (ASTM D-1586) t Peat, muck and other (3) .Si Static water level(date) • ^c N .^. In General Accordance with a-5 PT highly organic soils Standard Practice for Description (5) Combined USCS symbols used for O and Identification of Soils(ASTM D-2488) fines between 5%and 15% g - Classifications of soils in this report are based on visual field and/or laboratory observations,which include density/consistency,moisture condition,grain size,and plasticity estimates and should not be construed to imply field or laboratory testing unless presented herein.Visual-manual and/or laboratory classification o methods of ASTM D-2487 and D-2488 were used as an identification guide for the Unified Soil Classification System. g Associated Earth Sciences, Inc. l'i sr r; EXPLORATION LOG KEY FIGURE Al -- Lis 0 a