Geotechnical Engineering Report Addendum No 1 Results of Testing 01 29 2025 submission

U.S. Department of Agriculture (USDA) Soil Classification System Texture Triangle Fine Earth Texture Classes ( ) Texture Class Code Texture Class or Subclass Conv. NASIS Coarse Sand cos COS Sand s S Fine Sand fs FS Very Fine Sand vfs VFS Loamy Coarse Sand lcos LCOS Loamy Sand ls LS Loamy Fine Sand lfs LFS Loamy Very Fine Sand lvfs LVFS Coarse Sandy Loam cosl COSL Sandy Loam sl SL Fine Sandy Loam fsl FSL Very Fine Sandy Loam vfsl VFSL Loam l L Silt Loam sil SIL

Silt Loam sil SIL Silt si SI Sandy Clay Loam scl SCL Clay Loam cl CL Silty Clay Loam sicl SICL Sandy Clay sc SC Silty Clay sic SIC Clay c C Texture Modifiers – (Adjectives) Texture Modifiers – Conventions for using “Rock Code Criteria: Percent (by volume) of Fragment Texture Modifiers” and for using Rock Fragments: PDP/ total rock fragments and Size and Quantity Conv. textural adjectives that convey the “% volume” NASIS dominated by (name size): ranges for Rock Fragments – Size and Quantity. Rock Fragments (> 2mm; ≥ Strongly Cemented) Gravelly GR GR ≥ 15% but < 35% gravel Fragment Content Rock Fragment Modifier Fine Gravelly FGR GRF ≥ 15% but < 35% fine gravel % By Volume Usage Medium Gravelly MGR GRM ≥ 15% but < 35% med. gravel No texture adjective is Coarse Gravelly CGR GRC ≥ 15% but <35% coarse gravel < 15 used (noun only; e.g., Very Gravelly VGR GRV ≥ 35% but < 60% gravel loam). Extremely Gravelly XGR GRX ≥ 60%

15 used (noun only; e.g., Very Gravelly VGR GRV ≥ 35% but < 60% gravel loam). Extremely Gravelly XGR GRX ≥ 60% but < 90% gravel Use adjective for Cobbly CB CB ≥ 15% but < 35% cobbles 15 to < 35 appropriate size; e.g., Very Cobbly VCB CBV ≥ 35% but < 60% cobbles gravelly. Extremely Cobbly XCB CBX ≥ 60% but < 90% cobbles Use “very” with the Stony ST ST ≥ 15% but < 35% stones 35 to < 60 appropriate size adjective; Very Stony VST STV ≥ 35% but < 60% stones e.g., very gravelly. Extremely Stony XST STX ≥ 60% but < 90% stones Use “extremely” with the Boudlery BY BY ≥ 15% but < 35% boulders 60 to < 90 appropriate size adjective; Very Bouldery VBY BYV ≥ 35% but < 60% boulders e.g., extremely gravelly. Extremely Bouldery XBY BYX ≥ 60% but < 90% boulders No adjective modifier. If ≤ Channery CN CN ≥ 15% but < 35% channers 10% fine earth, use the Very Channery VCN CNV ≥ 35% but < 60% channers appropriate noun for the ≥ 90 Extremely Channery XCN CNX ≥ 60% but < 90% channers dominant size class; e.g., Flaggy FL FL ≥ 15% but < 35% flagstones gravel. Use terms in lieu of Very Flaggy VFL FLV ≥ 35% but < 60% flagstones texture. Extremely Flaggy XFL FLX ≥ 60% but < 90% flagstones