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CONFIDENTIAL WATERWORK WELL/BORING LOG PROJECT LOCATION `EAST MARIPOSA ROAD, STOCKTON CA PROJECT PID. r WELL/BORING NO. MY' SURFACE ELEVATION NA FT WELLHEAD ELEVATION NA FT DATE DRILLED 01/15/91 REVIEWED BY NORA R KATAOKA RCE 38322 LOGGED BY KRYS M. HARDMAN DRILLING COMPANY SPECTRUM EXPLORATION DRILLER RAY LIVINGSTON METHOD HCLLOV STEM AUGER BORE HOLE DIAMETER 8 IN DEPTH DRILLED 86.5 FT DEPTH TO WATER, INITIAL 75 FT STATIC 7Q4 FT CASING TYPE F480 PVC DIAMETER 2 IN SCHEDULE 40 INTERVAL 0 FT TO 65 FT SCREEN TYPE F480 PVC DIAMETER 2 IN SLOT SIZE 0.010 IN INTERVAL 65 FT TO 85 FT FILTER PACK TYPE #2/12 SILICA SAND INTERVAL 635 FT TO 85 FT SURFACE SEAL TYPE 2' HYDRATE BENTONITE CHIPS/CEMENT-SAND GROUT INTERVAL 0 FT TO 635 FT NOTES WELL DEPTH PID SAMPLE ID USR SOIL DESCRIPTION DETAIL (FT) (PPM) BLGWCOUNI LOG 0 0-OS' ASPHALT 2 /CuCH 0.5-05/5.0' GRAVEL FILL OS/5.0-55' LEAN TO FAT CLAYI <52 SNDI >95% FNS; VH DRY S N DLTNCY; M-H TGHNSSI M-H PLST, M STIFF-STIFFI BRN 4 GRY) NPOI ORGANICS) DRY-MST) WEAK CEMENTATION HOMO 4 55-115/15' ELASTIC SILT) <5% SND) >95% FNS; M DRY STRNGTW SLV 6 8 DLTNCY; L 7GHNSSI L PLSTI STIFF) M YLLV BRM, NPO) ORGANICS) MST; WEAK CEMENTATION SOME ORGANICS 8 MM 10 5 _ 7 g11.5/15.0-L5.5' LEAN TO FAT CLAY) <57 SND) >95% FNS) H-VH DRY 12 STRNGTW N DLTNCY; M-H 7GHNSS; M-H PLSTI STIFF) DUS YLLV BRW NPOI ORGANICS; MSL WEAK CEHENTATIIIN HOMO 14 CL/CH 15.5-20.5' ELASTIC SILT) <5% SNB; >95Y. FNSI H DRY STRNG74 SLV 16 10 5 DLTNCY; L-H 7GHNSS; M PLST) STIFF; LT OLIVE BRp NPO ORGANICS] MST; WEAK CEMENTATION MOTTLED) SOME BLK ORGANICS 18 MH 20.5-21.5/25.0' ELASTIC SILT VITH SAND) <10% SA-SR, FN SND) >90'L FNS; M-H DRY STRNGTH) SLV DLTNCY; M TGHNSSI M PLST) STIFF; LT OLIVE BRW SL PDI MSL WEAK CEMENTATMN 20 5MOTTLED 6 8 21.5/25.0-265/30.0' LEAN CLAY) <5% SNDI >95% FNS) H DRY STRNGTW N-SLV 22 MH DLTNCY) M 7GHNSS; M-H PLSTI V STIFFI LT OLIVE GRY, SL POI MSTI VEAK-M CEMENTATION HOMO 24 26.5/30.0-31.0' ELASTIC SILT; <10% SND) )90% FNS; M-H DRY STRNGTW 9SLV DLTNCY) M TGHNSSI M PLSL V STIFF; M YLLV ERN 26 12 CL L LT OLIVE GRY; SL PO) DRY-MST) MOTTLED 13 _ 31.0-31.5/350' LEAN TO FAT CLAY; <57 SND; >95% FNSI H-VH DRY 28 STRNGTW N DLTNCY; M-H 7GHNSS; M-H PLSTI V STIFFI M /MH YLLV BRN L LT OLIVE GRYI SL PQ DRY-HST) MOTTLED 30 u 15 32 16 CL/CH 31.5/35.0-36.5/40.0' ELASTIC SILT; <10% SND, >90% FNSI L-M DRY STRNGTW SLV-R DLTNCY) L-M 7GHNSS) L-M PLST; HRD) LT OLIVEI NPOI MSL WEAK CEMENTATION; HOMOI NO RECOVERY FROM 35.0' 34 12 36 21 MH 30 36.5/40.0-46.0' SILT WITH SANDI <25% SA-SR, FN, PRLY GRDO SND; >75'L FNSI L-M DRY STRNGTHI SLV-R DLTNCYI L 7GHNSS) L 32 PLST; HRDI LT OLIVE) NPOI ORGANICS) MSL WEAK CEMENT- ATION MOTTLED 40 15 21 42 34 ML PAGE I OF 2