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Page 10 of 20 Table t Groundwater Elevation and Analytical Data ARCO Service Station#2093 3425 Tracy Blvd,Tracy,CA Well Depth Groundwater Groundwater Product Ethyl- Xylenes Well Date Bevatlon to Water ©evation Bevation Thickness TPH9 Benzene Toluene benzene (total) MtBE DO Number Sampled (ft,MSL) (ft,TOC) (ft,MSL) Change(ft) (ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg/L) ATR-6 6/25/98 1197 3738 -028 (cont) 9111198 NP 1208 3727 -011 <50 <0 5 <0 5 <0 5 <0 5 <5 0 127 12/15/98 1195 3740 013 -- -- -- -- 0 9 3117199 NP 1186 3749 009 <50 <0 5 <0 5 <0 5 <0 5 <5 0 19 5/14/99 1201 3734 -015 -- -- — -- -- -• 24 9/16/99 NP 1217 3718 -016 -- <50 <0 5 <0 5 <0 5 <0 5 <5 0 5 3 12J22199 1206 3729 Oil -- -- - -- -- -- 2 2 2/29100 NP 1165 3770 0 41 - <50 <0 5 <0 5 <0 5 <0 5 107 5 0 fi/7100 NP 1210 3725 -045 9125/00 NP 1222 3713 -012 -- <50 <0 5 <0 5 <0 5 <0 5 <2 50 070 12/29/00 1200 3735 0 22 -- -- -- -- -- -- 5 1 3/27101 P 1193 3742 007 - <50 0 <0 500 <0 500 <0 500 <0 500 52 l* 41 6/20101 12 04 3731 -0 11 9112!01 P 1203 3732 001 -- <50 <0 50 <0 50 <0 50 <0 50 12 18 12119/01 1195 3740 008 — — .- ATR-7 3/10/89 49 65 -- -- <200 <05 <0 5 <0 5 17 -- - 6/21189 1190 3775 <50 1 <0 3 06 0 5 - 9/18/89 1198 3767 -008 -- <50 0 4 <0 3 <0 3 1 1 - 12/27/89 1194 37 71 004 90 10 0 9 2 7 7 9 4118/90 1201 37 64 -007 -- <50 61 26 21 5 8 -- . 10/16/90 -- -- -- - <60 <0 5 <0 5 <0 5 <0 5 -- -- 10/19/90 1220 3745 -- 1/10/91 -- -- <50 6 <0 5 18 4 1 -- 4110191 7110191 "' -- -- -- -- -- 9/24/91 1234 3731 9/25191 -- -- -- <60 13 <0 5 <0 5 <0 5 -- 1123192 -- -- -- -- -- -- 4/20/92 - -- 7/8/92 -- -- -- 1017192 1221 3744 _ — 10!8/92 -- -• -- <50 <0 5 <0 5 <0 5 <0 5 -- -- 1/18/93 1133 3832 1/19193 -- -- <50 1 <0 5 0 6 <0 5 4114193 1175 3790 -- -- -- - -. -_ -- Projects!,0/2093/Reports/Tables/gwtables2093 As .