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i b6 I SOIL BORING[WELL CONSTRUCTIO OG Boring No. W Sheet. 2 of 2 Client Arco 2186 Date April 22,2009 `ddress 3212 N.California Street Drilling Co. Woodward Drilling rig type: BK-81 y Stockton CA Driller Amador Arroyo Project No. E2186-01 Method Hollow Stem Auger Hole Diameter: 6 inches Lagged By: Allan Dudding Sampler: 2 in.split soon Wel;Pack sand: 36 ft.to 58 ft. Well Construction Casing Material: Schedule 40 PVC Screen Interval: 38 to 58 ft bent.: 34 ft.to 36 ft. Casing Diameter:2 in. Screen Slot Size: 0.020-in _ grout: 0 ft.to 34 ft. Depth to GW; Ofirst encountered:50 feet bps -Static: Sample Blow Sample YOU Depth Llthologic pip lype No. Count Time Recnv. Details Scale Column Descriptions of Materials and Conditions PPM S MW-3R-40 20 1042 100% _ ML Silt,some day,ML,dark yellowish brown(t0YR 314),damp,low plasticity, p ------------ ---9--- ;: - 41 very stiff. 85%silt,15%clay. ------------------------------- 9 = --at 40.5 feet bgs,same as above with 1"layer of:Poorly-graded Sand with 12 1448 100% = 42 silt, SP,dark yellowish brown(10YR 3/4),damp,fine to medium grained, — . -----o--------- -------- ----- -------------------------- _ - 7 90%sand, 10%silt,trace fine gravel. 16-- - = --at 42 feet bgs,no sand layers,caliche prevalent. ---- -1 430 o — --------------------------------------------------------------- 21 1057-- 140/ �: — 9 44 Silt with clay ML,dark yellowish brown(10YR 4/4),damp, low plasticity,very -------------------------------------- — — — — ----------------------------------------------------- 9 stiff,no staining. 75%silt,25%clay. S MW-3R-45 14 1103 100% = 45 -- --- ----------- --------------- -------- --------------------- — — ---------------------------------------------------------- 1 G = —at 45 feet bgs,same as above with caliche and Mn03 staining. 10 46 -`----------------------------------------------------- 15 15 A 47 —at 46.5 feet bgs,same as above. - - — — ------------------------------------------------------------------------------ ------------------------ 20 — 28 1113 1006% = 48 —` - - ---------- ----- -•--`-— ----------- -------------------- 14 at 48 feet bgs,same as above,moisture increases to moist,trace fine ----------------- ---25- ------- = a9 sand. _ --------------------------------------------------------------------------------------------------- -------- 11 1117 1400% — 7 ------ Q - 50 -- 6 Sandy Silt,ML,dark yellowish brown(10YR 314),wet,non-plastic,stiff. 60% SMW-3R-50 9 1130 100% - 51 silt,40%fine to medium sand. 0 10 = 10 — 52 ------------------`------------------ -_..no — -------------- 15 1137 104/ _ --at 52 feet bgs,sand content decreases to 10%fine grained sand. 7 53 -------------------- - --- ---------------- _ -----------------------------------------•-----•------- ----------------------------------------------------- 10 - -10 1141 100% :; 54 SW Weli-graded Sand,SW,dark yellowish brown(10YR 314),wet,fine to coarse - ------- — 12 _ grained,medium dense. 100%sand. 22 55 --at 54 feet bgs,trace fine gravel present. - — -----------------•---`-------------------------------•----------- S MW-3R-55 � 3fi 1151 104% _ - —`— 0 .5 = 56 --at 55.5 feet bgs,same as above. - 8 - - — ------•----------- - ------------------ --- ------------ ------ 12 1155 100% 57 ----- ---------------------------`— - — ------------ --------------` 8 — --at 57 feet bgs,same as above. -- -1 ; _ 58 1200 - - —- — — 0 S MW-3R-58 22 1200 100% 59 60 Comments:Borehole drilled to 58 feet bgs,sampled to 58.5 feet bgs;well set at 58 Recovery feet bgs. Sample ENVIRONMENTAL, INC.