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a • 9g,90116 Tablet Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd Tracy CA i Well Depth Groundwater Groundwater Product Ethyl Xylenes Well Date Elevation 10 Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MTBE DO Number Sampled (fl MSL) (1t TOC) (It MSL) Chan s(tt) (it) (ppb) (ppb) (ppb) (ppb} pb) (Ppb) (m /L ATR 7 4/25/1995 1241 3724 041— <50 <0 5 <0 5 <0 5 <0 5 (cont) 7/27/1995 1261 3704 020 <50 <0 5 <0 5 <0 5 <0 5 10/26/1995 1267 3698 006 <50 <0 5 <0 5 <0 5 <0 5 — 2112/1996 11 95 3770 0 72 <50 <0 5 <05 <0 5 <0 5 4/1811996 12 35 3730 040 <50 <0 5 <0 5 <0 5 <0 5 — 7/18/1996 1245 3720 010 <50 <0 5 <0 5 <0 5 <0$ 28 11/15/1996 13 11 36 54 0 66 — <50 <0 5 <0 5 <0 5 <0 6 120 3/14/1997 1320 3645 009 <50 <0 5 <0 5 <0 5 <0 5 6 3 010 6/4/1997 NP 1244 3721 0 76 <60 <0 5 <0 5 <0 5 <0 5 <2 5 013 6/11/1997 NP 12 72 36 93 028 <50 <0 5 <0 5 <0 5 <0 5 22 1 111 7/1 997 NP 1266 3699 006 <60 <0 5 <05 <0 5 <0 5 3 5 — 3130/1998 NP 12 11 37 54 066 <50 <0 5 <0 5 <0 5 <0 5 <50 1 3 5/25/1998 NP 1246 3719 0 35 — <50 <0 5 <Q 5 <0 5 <0 5 <50 2 5 9/11 11 998 NP 12 51 37 14 005 <50 <0 5 <05 <0 5 <0 5 <2 5 1 14 12/1511998 NP 12 41 3724 010 <50 <0 6 <0 5 <0 5 <0 5 <50 220 3/17/1999 NP 1223 3742 018 — <50 <0 5 <0 5 <0 5 <0 5 <5 0 200 5/14/1999 NP 1241 3724 018 <50 <0 5 <0 5 <0 5 <0 5 <5 0 1 90 9/1611999 NP 1258 3707 017 <50 <0 5 <0 5 <0 5 <0 5 <5 0 360 12/22/1999 NP 12 52 $713 0 06 <50 <0 5 <0 5 <0 5 <0 5 <2 50 420 2/29/2000 NP 12 06 37 59 046 <50 <0 5 <0 5 <0 5 <0 5 <2 50 470 6/7/2000 NP 12 55 3710 0 49 — <50 <0 5 <0 5 <0 6 <0 5 572 912512000 NP 12 71 3694 016 <50 <0 5 <0 5 <0 5 <05 <2 50 050 12/29/2000 P 1243 3722 028 <50 0 <0 600 <0 500 <0 500 0 656 17 5' 67 a/2712001 P 1233 3732 010 <50 0 <0 500 <0 500 <0 500 <0 500 305` 3 8 6/20/2001 P 12 47 3718 014 <50 <0 50 <0 50 <0 50 <0 50 560' 9112/2001 P 1250 37 15 0 03 <50 <0 50 <0 50 <0 50 <0 50 140 1 2 12/1912001 P 12 35 37 30 0 15 <50 <0 50 <0 50 <0 50 <0 50 7 2' 1 01 3/14/2002 P 1242 3723 007 <50 <0 50 <0 50 <0 50 <0 50 14' 0 66 6/28/2002 P 12 48 37 17 006 <50 <0 5 <0 5 <0 5 <0 5 0 97" 3 6 9/11/2002 P 1244 37 21 004 — <50 <0 5 <0 5 <0 5 <0 5 1/' 2 9 ATR 8 W2511991 4598 2,700 110 <0 5 130 98 9/25/1991 885 37 13 1 400 95 <0 5 51 97 — 1/23/1992 8 29 3769 0 56 <50 2 5 <0 5 <0 5 <0 5 — 4/20/1992 Sit 3787 018 _ 4/21/1992 140 14 0 9 14 9 3 _ ~ 7/8/1952 848 37 50 87 4 0 <0 5 D2 08 10!7/1992 869 3729 0 21 10/8/1992 — 140 7 8 32 11 8 8 1/18/1993 7 09 3889 _ 1/19/1993 980 140 1 7 11 34 _ 4/14/1993 7 80 3818 4/15/1993 — — 110 4 2 <0 5 46 4 9 8/31/1993 981 3617 700 150 15 41 71 10127/1993 8 68 3730 1 13 52 000 620 2 100 2,800 8,700 2117194A 825 37 84 0 54 014 5/20194~ 8 55 37 54 0 30 0 14 1017194^ 8 70 3739 -0 _15 0 14 KUZ SP AA001020P340ua t0,V,%OTA 4ZITaM,1_2_3 A,