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Tas Pof 16 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,California Floating Well Depth product Groundwater Groundwater Total Date Elevation to Water thickness Elevation Elevation Change TPH-G Benzene Toluene Ethylbenzene Xylenes MTBE DO Sampled (feet,MSL) (feet,TOC) in feet (feet,MSL) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mgA) ATR-3 10/19/90 1228 -- 3765 007 -- — -- _ _ (cant) 01/10/91 1201 — 3792 027 2,600 610 230 160 670 - - 04/10/91 1182 — 3811 019 3,000 910 120 110 190 - -- 07/10/91 1223 — 3770 -0 41 19,000 420 300 340 760 - 09124!91 1257 -- 3736 -034 2,000 280 81 69 130 01/23/92 1212 Sheen 3781 045 — -- -- _ _ 04/20/92 11 93 Sheen 38 00 019 -- -- -- 07/08/92 12 22 Sheen 3771 -0 29 — -- 10/07/92 1238 Sheen 3755 -016 -- — _ 01/18/93 1122 Sheen 38 71 1 16 -- 04/14/93 1149 Sheen 38 44 -027 -- 08/30/93 1243 Sheen 37 50 -094 -- 10/27/93 1239 Sheen 37 54 0 04 — — — -- _ _ 02/18/94 1200 3793 039 1,900 200 27 120 140 — 05/20/94 1207 Sheen 3786 -007 — -- — _ _ _ 10/07/94 1238 Sheen 3755 -031 — — 12/16/94 1203 Sheen 3790 035 — — 02/28/95 1205 003 3790 000 -- -- 04/26/95 1232 Sheen 3761 -0 29 -- -- 07/27/95 1251 - 3742 -019 -- — 10/26/95 (c) 1297 -- — -- — _ — .. _ 02112!96 1210 — — 1,500 89 <05 43 150 04/18/96 1260 -- — .. — _ _- 07/18/96 1260 — — 1,600 26 5 2 70 51 1,800 — 11/15/96 1340 — -- -- _ _ __ 03/14/97 NP 1334 -- -- -- 1,200 10 <0 5 43 19 620 005 06/04/97 1270 — -- — — -- -- — 015 08111/97 NP 1272 3,400 20 <10 160 110 <50 -- 11/17/97 1293 — — -- _ — __ 03/30/98 NP 1218 -- -- -- 8400 <25 <2 5 100 52 120 0 8 06/25/98 1241 -- — _ — _ 09/11/98 NP 1284 — — - 1,100 61 <0 5 25 22 41 123 12/15/98 1160 — — - -- -- -- -- -- — 21 03/17/99 NP 1241 -- 3752 — 652 141 <0 5 11 7 729 164 7 8 05/14/99 NP 1270 -- 37 23 -029 — — -- — — -- 120 09116199 NP 1279 -- 3714 -009 2,800 17 5 <5 0 49 9 151 523 19