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Project: ARCO Station # 2186 Log of Monitoring Well: Location 3212 N California Street,Stockton,CA, Protect Number 38466463 BSI-1NW-4 Dates Drilled 4/13/2004 Total Depth 41 Borehole Name BH-1 ng Cantfactor Gregg Drilling Well Construction Date 4/13/04 Logged By 7 Brooks ole Diameter 10-Inch Casing Diameter 4-mch Casing Type SCH 40 PVC Checked By V Elarth R G Drilling Method Hollow Stem Auger Screen interval 25 40' Slot Size 0 020-inch Sampling Method Split spoon Continents w g Ug 3 Q w E LITROLOGY DESCRIPTION WELL CONSTRUCTION 0 Asphalt and aggregate base Flush mount traffic grade 0 vault box Sandy Silt(ML) Dark grayish brown 35% fine to medium 4 inch SCH 40 PVC with grained sand stiff moist locking pressure cap to 40 bgs Vacuum cleared to 5 bgs 5 Olive brown hard 5 59 00 ]Neat Cement from near Dark yellowish brown moderate caliche moderate iron oxide surface to 20 bgs 10 77 00 staining 30%very fine to fine grained sand 10 5 19 00 Olive brown 45%very fine to fine grained sand silty sand 15 15 mterbeds very stiff 20 26 00 Olive gray 20%very fine to fine grained sand 20 20-23 Bentonite Seal 25 37 00 Silty Sand(SM) Olive brown 70%very fine to fine grained 25 sand 30%silt micaceous dense moist Sand(SP) Very dark grayish brown poorly graded veryfine to fine grained sand with trace medium grained sand medium dense moist 24 0 0 30 25 40 4-mch SCH 40 PVC 30 0 020 inch Slot Screen #3 Filter Pack Sand 23 40 Trace subrounded gravel up to 1/4 in diameter 35 30 00 Sandy Silt (ML) Dark yellowish brown 30%fine grained 35 sand micaceous moist very stiff Silty Clay with Sand(CL) Light olive brown 30%silt 15% IK very fine to fine grained sand 55%low plasticity clay very 2l 0 0 stiff moist Formation collapse to 40 2 a0 ao 0 -__ 2870 Gateway Oaks Dr Ste 300 Sacramento CA 95833 UM9166792000