202 ALDER ST Geotech Report 2025-07-30

)o o Well-graded gravel Terms Describing Relative g EQ EN)0 966- GW and gravel with sand, Density and Consistency .'O Q( little to no fines CD N LL)2e3 Density SPT(3)blows/foot >> o m' itbooc Poorly-graded gravel Coarse- Very Loose 0 to 4 in vWU O 00 GP Loose 4 to 10 Test Symbols iT) o O O o c and gravel with sand, Grained Soils o )O O O Medium Dense 10 to 30 G=Grain Size o d O O O( little to no fines Dense 30 to 50 N o Z ) M = Moisture Content z° too ) Very Dense >50 A=Atterberg Limits o as N >%00 GM Silty gravel and silty Consistency SPT(3)blows/foot C=Chemical 0 , ..- c Q� gravel with sand Very Soft 0 to 2 DD=Dry Density c o a) ;L)0 Fine- Soft 2 to 4 K= Permeability •4a m a .' Grained Soils cu N>0 Clayey gravel Medium Stiff 4 to 8 Ni OQ Stiff 8 to 15 cc a ) GC and clayey gravel Q with sand Very Stiff 15 to 30 in C� ) o Hard >30 C CIS °°g°° Component Definitions C 3 o°0° Well graded sand p w• .2 �T. N D o o 0 c SW and sand with gravel, Descriptive Term Size Range and Sieve Number O• u- G 0 a 0 0 0 little to no fines Boulders Larger than 12" N LL.� n n 0 0 > Poorly-graded sand Cobbles 3"to 12" u) v2 vi':. ' SP and sand with gravel, Gravel 3"to No.4(4.75 mm) o Coarse Gravel 3"to 3/4" c o d little to no fines Fine Gravel 3/4"to No.4(4.75 mm) 0 N Sand No.4(4.75 mm)to No.200(0.075 �,^ Silty sand and mm) i• o :: SM silty sand with Coarse Sand No.4(4.75 mm)to No. 10(2.00 mm) O o a d gravel Medium Sand No.10(2.00 mm)to No.40(0.425 mm) V o it/..:1Ii1 Fine Sand No.40(0.425 mm)to No.200(0.075 mm) Clayey sand and Silt and Clay Smaller than No.200(0.075 mm) mNs SC clayey sand with ravel (4)Estimated Percentage Moisture Content g Component Percentage byWeight Dry-Absence of moisture, p 9 g Silt,sandy silt,gravelly Trace <5 dusty,dry to the touch >• o ML silt,silt with sand or Slightly Moist-Perceptible 1.0 i c gravel Some 5 to<12 moisture o >. / Moist-Damp but no visible coV 0 2 A Clay of low to medium Modifier 12 to<30water 0 cw CL plasticity;silty,sandy,or (silty,sandy,gravelly) Very Moist-Water visible but zW 0 E gravelly clay,lean clay not free draining °v; Very modifier 30 to<50 Wet-Visible free water,usually a : (silty,sandy,gravelly) from below water table B J _—_= OL Organic clay or silt oo of low plasticity Symbols _ Cement grout ° Elastic silt,clayey silt, Sampler Type and Description Groundwater surface seal MH silt with micaceous depth o N ' ;5 Blows/6"or portion of 6" Bentonite seal an $ or diatomaceous fine p ATD _ y T ) At time 2 sand or.silt Split-Spoon Sampler(SPT Filter pack with 'o 0 0 of drilling . blank casing Clay of high California Sampler CH plasticity,sandy or Ring Sampler section o c_ m E gravelly clay,fat clay Static water SL• Screened casing N w n• Continuous Sampling level(date)_ a / with sand or gravel ( ) _ or Hydrotip with. N a) in •5 //o _ Grab Sample . .— filter pack 0 c o- //// Organic clay or silt of Portion not recovered — '` '' j j j OH medium to high — — End cap //// plasticity F f Classifications of soils in this report are based on visual field and/or laboratory observations, n which include density/consistency,moisture condition,grain size,and plasticity estimates g `� � Peat,muck and other and should not be construed to imply field or laboratory testing unless presented herein. ki in k PT highly organic soils Visual-manual and/or laboratory classification methods of ASTM D-2487 and D-2488 were used as an identification guide for the Unified Soil Classification System. 3 N N (1) Percentage by dry weight associated Y (2) Combined USCS symbols used for fines between 5%and 12% (3) (SPT)Standard Penetration Test(ASTM D-1586) ! earth sciences (4) In General Accordance with Standard Practice for Description < ,. incorporated and Identification of Soils(ASTM D-2488) EXPLORATION LOG KEY' FIGURE: Al