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Project: ARCO Station #4493 Log of Monitoring Wells: <br /> Location. 205 North Center St.,Stockton,CA Project Number: 38465950 MW-11M and MW-11D <br /> Dates Drilled 11/5/02 Total Depth Dnlled 56 5 feet bgs Logged By 7 Brooks <br /> Dnlhng Contractor Gregg Drilling Borehole Diameter 10-inch Checked By V Elarth <br /> Rig Type Irmtted Access HSA Well Construction Dates 1115/02 Screen Slot Size 0 020-mch <br /> Drilling Method Hollow Stem Auger Well Diameter 2-mch <br /> Dnll Bit 10-inch HSA Type of Well Casing SCH 40 PVC <br /> Comments Pneumatic Hammer-no blow counts <br /> 0 LITHOLOGY DESCRIPTION WELL CONSTRUCTION <br /> No Samples taken 0 15 feet bgs Flush mounted Christy box 0 <br /> Wells secured with locking <br /> M M pressure caps <br /> W W Neat Cement from near surface to 9 bgs <br /> 5 15 <br /> MW I1M 2-inch SCH 40 PVC to I3 <br /> 1 1 <br /> M D MW-1 I D 2-inch SCH 40 PVC to 48 <br /> 10__ 9-11 5 Bentonite Chips 10 <br /> 15 00 <br /> Sandy Silt(MI.) Greenish gray to olive gray with MW I IM 2 inch SCH 40 PVC 15 <br /> reddish brown iron oxide staining,moist 0 020 inch Slot Screen 13 33, <br /> #3 Filter Pack Sand 11 5-35 <br /> 20 S Fust water 20 bgs 20 <br /> o 0 Sandy Clay(CL) Greenish gray with reddish brown iron <br /> oxide staining mist-wet saturated low plasticity <br /> medium stiff <br /> 25 0 025 <br /> Sandy Silt(MH) Olive gray with reddish brown iron <br /> oxide staining wet saturated <br /> 30 <br /> 00 Sandy Silt(ME) Olive gray with little reddish brown 30 <br /> Iron oxide staining wet-saturated <br /> 35 <br /> 00 Silty Clay/Sandy Clay(CL) Olive gray wet saturated, <br /> low plasticity medium stiff-stiff <br /> 40 00 35 46 Bentonite Chips 40 <br /> Sandy Clay(CL) Olive dray wet saturated low <br /> Plasticiry medium stiff stiff <br /> Silty Sand(SM) Moderate-well graded olive brown, <br /> fine grained silty sand 20%silt,80%sand <br /> 45 wet-saturated subrounded rounded moderately cohesive <br /> 00 45 <br /> so-- 0 0 �i 2 inch SCH nch Slot Screen 4 48 50 <br /> 8-53 C <br /> Silty Sand fin Moderate-well graded,olive #3 Filter Pack Sand 46-56 5 <br /> brown gray fine medium grained silty sand 15%silt, <br /> 85%sand,wet,subrounded-rounded wet saturated <br /> moderately cohesive <br /> • 55 0 0 As Above 55 <br /> SiltyClay(CL) Dark olive-blue a stiff-very stiff <br /> UM2870 Gateway Oaks Dr Ste 300 <br /> Sacramento CA 95833 <br /> 916679 2000 <br />