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ALTON GEOSCIENCE PROJECT NO, 3U- 136-01 DATE DRILLED 4/3/92 WELL NO. LOG OF EXPLORATORY AMM CLIENT Former Mobil Oil Bulk Plant 04-343 AW-9 BORING 1 4LOCATION 50.0 E._Grant]ins Road,Tracy,California BORING LOGGED BY G. Nieder-Westermann APPROVED BY B-10 FIELD SKETCH OF BORING LOCATION Page 1 of 2 DRILLING METHOD. CME-55 Hollow Stem AugerHOLE DIAM. 12' SEE FIGURE 2 SAMPLER TYPE Continuous CASING DATA_ 8'Sch.40 PVC:8.5' Blank 20'Screen TOP OF CASING ELEVATION 31,.26' DRILLER_ _WestHazmat Drilling Corporation .-, o DEPTH TO WATER 12.5' Q J S J DATE 413192 C3 TIME 9:15 AM Q L U � a of o U 5 Cr DESCRIPTION 0 , s"diamFILL:dry to damp, moderate yellowish brown, sandy GRAVEL; 2 Sch.40 ;•; slight silt; gravel to 2' diameter. PVC 4 Casing % ` .* FILL:damp to moist, moderate yellowish brown, sandy 6 f �;• GRAVEL; slight sift; gravel to 2' diameter. . `•` FILL: damp to moist, moderate yellowish brown, coarse- <5 8 6'diam.: grained sandy GRAVEL; slight silt; gravel to 2'diameter. ego Sch. 40 ND/1.8 =. (LEL) 10 PVC , medium stiff,damp to moist, light olive-gray,clayey SILT- 475 480/510 0.010 12 slotting soft,saturated, fight olive-gray SILT;trace fine-grained sand. ML soft, saturated, moderate yellowish brown SILT; trace <10 14 Fine-grained sand. 16 18 medium stiff, wet, moderate yellowish brown,silty CLAY; 20 trace medium-to coarse-grained sand. stiff, wet, moderate yellowish brown, silty CLAY;trace 22 CL medium-to coarse-grained sand. 24 stiff, wet, moderate yellowish brown CLAY; trace medium-to coarse-grained sand. 26 stiff, wet, moderate yellowish brown, silty CLAY; End Cap.. little medium-grained sand. 28 stiff, wet, moderate yelloWsh brown CLAY. 30 Boring terminated at approximately 28-1/2 feet below grade.