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LOG OF WELL PW10-138A Page 1 of 4 <br /> Date(s) Drilled: 3-2-94 to 3-4-94 Geologist: Donald W. Clarke III(RFW) <br /> Drilling Contractor: Clark Well Client: TreaTek-CRA <br /> Driller/Helper: Ken Plaster/Tony Serpa Site: Occidental Chem./Simplot <br /> Rig Type: Failing Holemaster 1250 Location: Lathrop, California <br /> Method: Mud Rotary (No mud) Pilot Diam: 6 inches <br /> Development: Surging w/ compressed air Ream Diam: 12 inches <br /> (- 2000 gallons purged) Drilled Depth: 140 feet <br /> Depth Description <br /> 00 <br /> 0 <br /> SM--Brown to reddish brown SILTY FINE SAND, micaceous, rootlets, concrete fragments at <br /> 2 about 5 feet. <br /> 4 <br /> 6 ML—Dark brown to grayish brown FINE SANDY SILT to CLAYEY SILT, micaceous, slightly <br /> plastic. <br /> 8 <br /> 10 CL—Bluish gray SILTY CLAY, moderately plastic. <br /> 12 <br /> CL—Light olive gray SILTY CLAY, moderately plastic, with oxide staining. <br /> 14 <br /> 16 <br /> 18 u yl; SP--White to light gray FINE TO COARSE SAND, locally cemented and very hard. <br /> !IIIi. I <br /> 20 <br /> SM/SC—Light gray SILTY TO CLAYEY FINE SAND, cohesive. <br /> 22 - <br /> 24 <br /> CUML—Olive brown to light gray SILTY CLAY to CLAYEY SILT, moderately to slightly plastic, <br /> 26 respectively, silt more predominant deeper. <br /> 28 <br /> 30 <br /> 32 <br /> 34 <br /> 36 <br /> 38 SP--Tan to light brown FINE TO MEDIUM SAND to FINE TO COARSE SAND. <br /> 40 (continued) <br />