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Table 1 Groundwater Elevation and Analytical Date ARCO Service Statlon No 2093 3425 Tracy Boulevard Tracy CaMomia Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Data Elevation to Water Elevation Elevation Thickness TPHg Benzene Toluene benzene (total) MtBE DO Number Sampled (k,MSL) (k,TOC) (k,MSL) Change(ft) (k) (f g/L) (7ry/L) (F,9/L) (POIL) G,g&) � ) (n,1 ) ATR 1 4!23/1987 50 58 1249 38 09 <100 <05 <0 5 <05 23 12/22/1987 1263 .3795 0 M - 59 <05 09 <05 — - 3/24/1 gaB 12.54 3804 009 - <05 <05 <05 <05 6/23/1968 1283 3775 029 <0 5 1 3 43 22 9/29/1988 1301 37 57 018 — <0 5 <0 5 <0 5 <0 5 2/22/1989 1246 3812 055 <100 1 4 <0 5 <05 1 8 6/2111989 1237 38 21 009 - 520 360 08 21 35 9/18/1989 1286 3770 051 27,000 250 1,200 570 7,100 12/27/1989 1268 37 90 0 20 <50 34 <03 73 14 4/18/1990 12,84 3774 016 13 211 5 16 16 - - lOH6/10W - <50 10 <05 20 20 10/19/1990 1310 3748 - 1/10/1991 1278 3780 032 <50 24 <05 57 23 4/10/1991 1252 3B D6 0 25 73 1 3 <05 48 <05 7/10/1991 1295 3763 043 90 2 <05 47 17 9/24/1991 13.30 3728 035 <50 <0 5 <05 <0 5 <0 5 1/23/1992 1277 3781 053 — <50 <0 5 <0 5 <0 5 <0 5 4/2(/1992 1258 38 00 019 <50 <05 <0 5 <05 <05 7/8/1992 1290 3768 032 <50 <0 5 <05 06 <05 1[/711992 1309 3749 019 <50 <05 <05 <05 <05 1/18/93 _ _ 4/14/1993 12.31 3827 - <50 <0 5 <0 5 is <0 5 - 8/30/1993 1318 3740 087 <50 <0 5 <0 5 <0 5 <0 5 - - 10/27/1993 1313 3745 005 <50 <05 <0 5 <05 <05 ?/1811994 1265 3793 048 17 06 10 1 0 08 5+20/1994 1271 3787 006 27 06 0 3 14 <05 10/7/1994 1314 3744 043 - <50 <D5 <05 <05 <05 12/16/1994 12.74 3784 040 <50 <0 5 <0 5 <0 5 <0 5 2/Ml 995 1265 3793 0 09 <50 <0 5 <0 5 1 0 <0 5 4/26/1995 1290 37 68 0 25 - <50 <05 <0 5 <05 <05 7/27/1995 1322 3738 032 10'2611995 1340 3718 018 - _ 10/27/1905 - <50 <05 <05 <05 <05 _ ?/1211996 1230 38 28 120 <05 <05 22 <0 5 4/18/1996 1290 3768 060 7/18/199B 1328 3730 038 <50 <05 <0 5 <05 <05 <50 1111 51996 13.74 3684 046 _ 3/14!1997 NP 1368 3690 006 - <50 <05 <05 <05 <05 0 30 6/4/1997 1304 37 54 084 0 6/11/1997 NP 1343 3715 -039 <50 <06 <0 5 <0 5 <0 5 23 22 11/17/1997 1329 3729 014 3130/1998 NP 12.58 3800 071 <50 <05 <0 5 <05 <05 <50 200 612.5/1998 1356 3702 -098 9/11/1998 NP 1320 3738 036 <50 <05 <05 <05 <05 <25 104 12/15/1998 1302 3756 018 _ 1 317/1999 NP 30 1279 37 79 023 <50 <05 <05 <05 <0 5 <5 0 510 514/1999 1306 3762 027 - - - 220 9/16/1999 NP 7336 3722 030 <50 <0 5 <0 5 <0 5 <0 5 <5 0 330 12/22/1999 1312 3739 017 — - 1 77 2/29/2000 NP 1245 3813 074 — <50 <05 <05 <05 <05 <25 490 617/2000 NP 1318 3740 073 9/25/2000 NP 1339 3719 -021 <50 <05 <05 <05 255 <2 5 0 3D 12129/2000 1299 3769 040 5 3 327/2001 Well inaccessible 6/20'2401 1301 3757 -002 8/12/2001 Well Inaccessible 12/19/2001 Well inaccessible 3/14/2002 Well inaccessible 6/26/2002 Well inaccessible 9/11/2002 Well Inaccessible 1 211 7/2002 02 3/31/2003 P 1292 3766 <50 <05 <05 <05 <05 061, 1 3 6/912003 1252 3806 040 Not Sampled 9118!2003 P Isis 3743 -063 <50 <0S <0.5 <0S <0.5 0.56' 0 9 ATR 2 4/23/1987 4922 1128 3794 — <100 <05 08 <05 <05 12122/1987 1140 37 82 012 <0 5 <0 5 <05 <05 '- 3/24/1988 1135 3787 005 <05 <0 5 <05 <05 6/23/1988 1155 3767 020 <05 <05 <05 <0 5 = 9/29/19881 1 71 3751 -016 <0 5 <05 <05 <0 5 2/2211989 1135 3787 035 370 Is 07 06 34 6/21/1989 1145 37 77 010 - <50 19 <0 3 04 <03 9/1811989 1105 3757 020 9 19 09 11 8 2 K1Wp,m—V5 BP ARC(A02093kQ-a.,yl3 OTR 0312083 GWMR 3003 Page f of 11