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GROUND ZERO ANALYSIS LOG OF BORING SB24/VAPOR WELL VW3 PROJECT KNOWIFS-ROEK LOCATION 102 5 WILSON WAY STOCKTOH CA PROJECT NO. 95-006 DATE DRILLED 10/04/95 LOGGED BY LOIS FRANTZ REVIEWED BY GREG P, STAHL RG N0. 5023 DRILLING COMPANY SPECTRUM EXPLORATION _ DRILLER DOUG SHEARER/RANDY HORTON METHOD NOI IOW STEM AUGER BORE HOLE DIAMETER 10 IN DEPTH DRILLED 59 FT DEPTH TO WATER : INITIAL NA FT STATIC FT CASING TYPE PVC F480 DIAMETER 4 IN SCHEDULE 40 INTERVAL O FT TO 39 FT SCREEN TYPE PVC F480 DIAMETER 4 IN SLOT SIZE 0.10 IN INTERVAL 39 FT TO 59 G7 FILTER PACK TYPE PEA GRAVEL INTERVAL 37 FT TO 59 FT SURFACE SEAL TYPE NEAT CEMENT OVER BENION'TE INTERVAL O FT TO 37 FT PAGE 1 OF 2 COMMENTS: WELL DEPTHU.S.C. DESCRIPTION DETAIL FT. LOG 0-6.5/10' SILTY SAND; 85X FN, SA-SR, PRLY GRDD SND; M DNS-DNS; 15% FNS; BLK BRN; NPO; DRY-MST; WEAK CEMENTATION; HOMO 2 SM 4 r 6 2.5 -7 9 6.5/10-26.2' ELASTIC SILT; 5% FN, SA-SR, PRLY GRDD SND; 95% FNS; L-M DRY STRNGTH; SLW DLTNCY; L-M TGHNSS; M-H PLST; STIFF; M YLLW BRN; NPO; DRY-MST; WEAK CEMENTATION; HOMO r S824-10.5' 10 1.9 4 7 11 12- 14- - 2.1 9 16 15 _ 15 MH SB24-20.5' 20 1.4 3 12 12 22 r 24 1.1 5 28 13 26.2-26.5/30' POORLY GRADED SAND; 95% FN-M, SA-SR, PRLY GROG SND; DNS; 5% FNS; M YLLW BRN; NPO; DRY-MST; WEAK CEMENT- SP ATION; HOMO 28 26.5/30-31.5/35' ELASTIC SILT LEAN CLAY; 5% FN, SA-SR, PRLY GRDD SND: 95% FNS; M-H G Y STRNGTH: SLW DLTNCY: L-M TGHNSS; M-H PLST; V STIFF; CRY BRN; N-SL PO; DRY-MST; WEAK CEMENT- SB24-30.5' ATION; HOMO 30 7.2 g 9 MH/CL 9 r 32- 31.5/35-38.5/40' ELASTIC SILT; 5% FN, SA-SR, PRLY GRDD SNO; 95% FNS; L-M DRY STRNGTH; SLW DLTNCY; L-M TGHNSS; L-M PLST; V STIFF; M-YLLW BRN; SL-M P0; DRY-MST; WEAK-STRNG CEMENT- 34- ATION; HOMO 22.6 6 MH 36 13 13 38.5/40-46.5/50' FNS GRRYN BRN; G15% N STRNG PO; MST; WEAK CEMENTATION; HOMO 38 SM itli - 51 40