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Ta* Ple of 17 Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy California I 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) (mg/1) ATR-1 04/23/87 5058 1249 - 3809 -- <100 <0 5 <0 5 <0 5 23 - - 12/22/87 1263 — 3795 -014 -- 59 <0 5 09 <0 5 - 03/24/88 1254 — 3804 009 <0 5 <0 5 <0 5 <0 5 — - 06/23/88 1283 -- 3775 -029 — <0 5 13 43 22 - 09/29/88 1301 -- 3757 -018 — <0 5 <0 5 <0 5 <0 5 - 02/22/89 1246 - 3812 055 <100 14 <0 5 <0 5 18 = 06/21/89 1237 3821 009 520 360 08 2 1 36 09118/89 1288 -- 3770 -051 27 000 250 1,200 570 7 100 -- - 12/27/89 1268 -- 3790 020 <50 34 <0 3 1 3 14 -- 04/18/90 1284 — 3774 -016 13 21 15 16 16 - 10/16190 -- — — — <50 1 <0 5 2 2 — - 10/19/90 1310 - 3748 -- -- -- — -- -- 01/10/91 1278 — 3780 032 <50 24 <05 57 23 - 04/10/91 1252 — 3806 026 73 13 <0 5 48 <0 5 -- 07/10/91 1295 — 3763 -043 90 2 <0 5 47 1 7 - 09/24/91 1330 — 3728 -035 <50 <0 5 <0 5 <0 5 <0 5 — - 01/23/92 1277 — 3781 053 <50 <0 5 <0 5 <0 5 <0 5 -- 04/20/92 1258 — 3800 019 <50 <0 5 <0 5 <0 5 <0 5 -- - 07/08/92 1290 — 3768 -032 <50 <0 5 <0 5 06 <0 5 - 10/07/92 1309 — 3749 -019 <50 <0 5 <0 5 <0 5 <0 5 - - 1118/93 — — — -- -- -- -- -- -- - -- 04/14/93 1231 — 3827 -- <50 <0 5 <0 5 15 <0 5 -- 08/30/93 1318 -- 3740 -087 <50 <0 5 <0 5 <0 5 <0 5 10127/93 1313 -- 3745 005 <50 <0 5 <0 5 <0 5 <0 5 - 02/18/94 1265 -- 3793 048 17 06 1 1 08 - - 05/20/94 1271 -- 3787 -006 27 06 03 1 4 <0 5 10/07/94 1314 — 3744 -043 <50 <0 5 <0 5 <0 5 <0 5 — 12/16/94 1274 — 3784 040 <50 <0 5 <0 5 <0 5 <0 5 - 02/28/95 12 65 -- 3793 009 <50 <0 5 <0 5 1 <0 5 - 04/26/95 1290 -- 3768 -025 <50 <0 5 <0 5 <0 5 <0 5 -- 07/27/95 1322 — 3736 -032 -- -- -- -- -- 10/26195 1340 -- 3718 -018 -- — -- -- -- -- - 10/27/95 — — — -- <50 <0 5 <0 5 <0 5 <0 5 - - 02/12/96 1230 - 3828 — 120 <0 5 <0 5 22 <0 5 - 04118/96 1290 — 3768 -060 -- -- -- -- -- 07/18/96 -07198/96 1328 — 3730 -038 <50 <0 5 <0 5 <0 5 <0 5 <5 -- 11115/96 1374 — 3684 -046 -- -- -- -- -- — ""