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GROUND ZERO ANALYSIS LOG OF BORING SB26/VAPOR WELLS VW4 & VW5 PROJECT KNOWLES—ROEK LOCATION 102 & WILSON WAY STOCKTON CA PROJECT NO. 95-006 DATE DRILLED 10/05-06/95 LOGGED BY LOIS FRANK/JEANNE BUCKTHAL REVIEWED BY GREG P. STAHL RG NO, 5023 DRILLING COMPANY SPECTRUM EXPLORATION DRILLER DOUG SHEARER/RANDY HORTON METHOD HOLLOW STEM AUGER BORE HOLE DIAMETER 12 IN DEPTH DRILLED 60 FT DEPTH TO WATER INITIAL MA FT STATIC FT VAPOR 1/612 VW4 CASING TYPE PVC F480 DIAMETER 4 IN SCHEDULE 40 INTERVAL 0 FT TO 5o FT SCREEN TYPE PVC F480 DIAMETER 4 IN SLOT SIZE n.1n IN INTERVAL 5o FT TO 6o FT FILTER PACK TYPE PEA GRAVEL INTERVAL 48 FT TO so FT SURFACE SEAL TYPE NEAT CEMENT OVER BENTONITE INTERVAL 42 FT TO 48 FT VAPOR WELL VW5 CASING TYPE PVC F480 DIAMETER 2 IN SCHEDULE 40 INTERVAL 0 R TO 14 FT SCREEN TYPE PVC F480 DIAMETER 2 IN SLOT SIZE n.1n IN INTERVAL 14 FT TO 42 FT FILTER PACK TYPE PEA GRAVEI INTERVAL 12 FT TO 42 FT SURFACE SEAL TYPE NEAT CEMENT OVER BENTONITE INTERVAL 0 FT TO 12 FT COMMENTS: PAGE 1 OF WELL DEPTH PID U.S.C. DESCRIPTION DETAIL FT. PPM BLOWCOUNT LOG 0-11.5/15' ELASTIC SILT/LEAN CLAY; 5% FN, SA—SR, PRLY GRDO SND; 95% FNS; M DRY STRNGTH; SLW DLTNCY; M—H TGHNSS; M—H PLST; 2 V STIFF; DRK YLLW BRN; SL PO; MST; WEAK CEMENTATION; HOMO 4 12 8 8 10 14 B 10 S926-10.5' MH/CL 145 e 9 10 12 14 11.5/15-41.5' ELASTIC DRY STRNCT}i; SLW fiLTNCY,� L L—MTGHNSS; M�H PLSTSTIFF- SB26-15.5' V STIFF; M YLLW BRN; M—STRNG P0; DRY—MST; M—WEAK 6 CEMENTATION; HOMO so 1800 10 16 12 18 20 SB26-20.5' 3 >2500 7 1 22 qw 24 SB26-25.5' 5 26 >2500 7 MH 9 28 is 30 S926-30.5' 7 >2500 10 12 32- -34- - >25DO 4 38 8 18 38 >2500