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GS1 GeoStrategies, Inc. Log of Boring U—L <br /> PROJECT FORMER UNOCAL STATION#0187 LOCATION 437 E Mrner Avenue, Stockton, CA <br /> GSI PROJECT NO 4827703 CASING ELEVATION <br /> DATE STARTED 7/6/94 WL (fl bgs) 475 DATE 7/6/94 TIME 1406 <br /> DATE FINISHED 7/6/94 WL (ft bgs) 43 DATE 7/7/94 TIME 0745 <br /> DRILLING METHOD 8 in Hollow Stem Auger TOTAL DEPTH 505 Feet <br /> DRILLING COMPANY West Hazmat GEOLOGIST Steve Carter <br /> w <br /> m <br /> r— o cn <br /> z GEOLOGIC DESCRIPTION REMARKS <br /> acnu <br /> a75 <br /> a� o 0 <br /> LU o n. m Cn En I cert, (.n <br /> CL <br /> Backfilled to ground <br /> surface with neat cement <br /> 5 0 53 UL 8 5 CLAY (CL) - dark grayish brown (10YR 4/2), hard, <br /> damp, medium plasticity, 100X clay <br /> 10 7 13 UL-10 5 color change to dark brown 00YR 4/3), stiff, moist <br /> 15 596 19 UL-15 5 color change to dark greenish gray (5GY 4/1), trace <br /> sand to 5-10X, product odor <br /> SC <br /> z� 192 33 UL-20 5 / CLAYEY SAND (SC) - dark olive gray (5YR 3/2), <br /> dense, moist, 75-80% fine to medium sand, 20-25% <br /> CL clay product odor <br /> 25 649 37 UL-25 5 CLAY (CL) - dark gray (5Y 4/1), hard, moist, medium <br /> plasticity, 100% clay, product odor <br /> 30 224 32 UL-305 color change to brown (10YR 5/3), product odor <br /> 35 240 UL-355 product odor <br /> 4� product odor <br /> 503 40 UL-415 I SP-SC <br /> 45 321 80 UL-45 5 / SAND WITH CLAY (SP-SC) - olive (5Y 4/3) very <br /> 85.1 dense, moist, 85-90% fine to medium sand, 10-15% <br /> J clay, product odor <br /> SC <br /> 493 71 UL-50 0 CLAYEY SAND (SC) - olive (5Y 4/3), very dense, <br /> 50 saturated, 70-7S% fine to coarse sand, 25-30% <br /> clay, trace to 5% fill gravel, product odor <br /> ( - converted to equivalent standard penetration <br /> 55 blows/ft} <br /> 60- <br /> 65- <br /> 70 <br /> a657a <br /> JOB NUMBER 4827 703 Page 1 of l <br />