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�k ALTON GEOSCIENCE PROJECT NO. 30-0136-01 DATE DRILLED 4/3192 WEL O. LOG OF EXPLORATORYCLIENT Former Mobil Oil Bulk Plant 04-343 AW 9 BORING ■ LOCATION 500 E. Grantline Road, Tracy, California BORING LOGGED BY G. Nieder-Westermann APPROVED BY B-10 FIELD SKETCH OF BORING LOCATION Pagel,0l 2 DRILLING METHOD CME-55 Hollow Stem AugerHOLE DIAM. 12' SEE FIGURE 2 SAMPLER TYPE Continuous CASING DATA _ 6'_Sch.40 PVC: 8.5' Blank,20'Screen__ TOP OF CASING ELEVATION 112& DRILLER West Haunat Drilling Corporation ❑ DEPTH TO WATER 12.5' E CLS w' DATE 413/92 a a U) U TIME 9:15 AM i E o_ — c Q O U w co p tj : DESCRIPTION 0 , FILL: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 i •;• GRAVEL; slight sift; gravel to 2'diameter. 6 �,• FILL:damp to moist, moderate yellowish brown,coarse- `$ 8 6'diam.c grained sandy GRAVEL; slight silt; gravel to 2"diameter. 8% Sch. 40 ' ND/1.8 10 PVC (LEL) PVC stiff,damp to moist, light olive-gray, clayey SILT. 475 480/510 0.010' 12 slotting 0 soft, saturated, light olive-gray SILT;trace fine-grained sand. 14 fNL soft, saturated, moderate yellowish brown SILT, trace 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. F i 24 stiff, wet, moderate yellowish brown CLAY; trace medium-to coarse-grained sand. 26 stiff, wet moderate yellowish brown, silty CLAY; End Ca little medium-grained sand. 28 stiff, wet, moderate yellowish brown CLAY. 30 Boring terminated at approximately 28-112 feet below grade. i i z a ;.