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LOG OF EXPLORATORY BORING <br /> PROJECT NUMBER 939-02.06 BORING NO. G-1 <br /> PROJECT NAME S.J. County Landfill Development Site PAGE 8 OF 9 <br /> BY BAB DATE 6/22-23/87 SURFACE ELEV. 117.07 <br /> POCKET PENETRA- y LITHO- <br /> TORVANE PENETRO- TION z Cr 0 z GRAPHIC <br /> METER W x o DESCRIPTION <br /> (Blows/ ` w a COLUMN <br /> (TSF) (TSF) Ft.) J c y <br /> ML- SANDY SILT to SILTY SAND (continued) ; <br /> SM dark yellowish brown (10YR, 4/4) ; <br /> very fine to fine grained; minor <br /> medium grained, common black coat- <br /> ings; increasingly more indurated. <br /> CL/ CLAY and SILTY SAND, Interbedded (1:1); <br /> 145 SM Clay: weak red (2.5YR, 5/2) ; more <br /> indurated than clay above. <br /> Silty Sand: dark yellowish brown <br /> (10YR, 4/4); 40% fines; very fine <br /> to fine grained; minor medium <br /> grained; trace iron and manganese <br /> oxidation. <br /> SILTY SAND, dark yellowish brown (10YR, <br /> SM 4/4) ; 15-25% fines; very fine to fine <br /> grained; slightly more quartzose and <br /> 150 micaceous than above; iron (? ) <br /> V cemented; low rock hardness. <br /> 6/23/87 <br /> SM/ <br /> SM- SILTY SAND, SAND, SANDY SILT and CLAY, <br /> SP/ : Interbedded (approximately 50%, 10%, <br /> ML/ T 20%, 20%) ; <br /> CL Silty Sand: as at 150' . <br /> Sand: yellowish brown (10YR, 5/4) ; <br /> 155 5-10% fines; predominantly medium <br /> SM- to coarse grained; trace very hard <br /> SP rounded fine pebbles. <br /> Sandy Silt: dark yellowish brown <br /> (10YR, 4/6); 20-25% fine-grained <br /> Core Bo sand; slightly clayey; trace fine <br /> 1 SM rootholes. <br /> SILTY SAND, yellowish brown (10YR, 5/4) ; <br /> 10% fines; predominantly medium to <br /> coarse grained; trace fine gravel ; <br /> 60 M IT minor clay interbeds. <br /> REMARKS <br /> 7 denotes first encountered water. <br /> Interval 156.5-166.5 feet cored (2 feet recovery). <br /> denotes core recovered. <br /> PLATE A-22 <br />