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Table 1 <br /> Groundwater Elevation and Analytical Data <br /> ARCO Service Station No 2130 <br /> 7906 N EL Dorado Street, Stockton, CA <br /> TOC Depth to Water Level Ethyl- Total <br /> Well Date PI Elevation Water Elevation TPHg TPHd Benzene Toluene benzene Xylenes MtBE DO <br /> Number Sampled NP (feet msl) (feet bgs) (feet msl) WIL) (pg/L) WIL) (pg/L) (pg/L) WIL) (Iig/L) (mg/L) Comments <br /> MS-1A 12/19/2002 — — 4239 — NA — NA NA NA NA NA -- <br /> 03/06/2003 P -- 3886 -- 240 -- 22 66 17 12 <0 50[2] 19 <br /> 06/11/2003 P — 3812 -- 110 -- 16 64 16 10 0 55[2] 686 <br /> 09124/2003 P 4215 — <50 -- <0 50 <0 50 <0 50 <0 50 0 51[2] -- <br /> 12/10/2003 P -- 4243 -- 120 — 16 18 37 24 0 58[2] -- <br /> 03/0912004 P -- 3894 -- 170 -- 22 <0 50 <0 50 <0 50 7 7[2] 211 <br /> MS-1 B 12/19/2002 -- - 4196 — 82 — 10 <0 50 18 <0 50 <0 50[2] — <br /> 03/06/2003 P -- 3900 -- 510 -- 93 10 4 6 21 <0 50[2] 13 <br /> 06/11/2003 P — 3833 - 130 — 27 16 J <0 50 069 J <0 50[2] 315 <br /> 09/24/2003 P -- 4230 — <50 — <0 50 <0 50 <0 50 <0 50 0 62[2] — <br /> 12/10/2003 P -- 41 99 - 120 -- 14 15 31 20 0 57[2] — <br /> 03/09/2004 P -- 3907 — 430 — 25 <0 50 <0 50 <0 50 8 9[2] 296 <br /> MS-2A 12/19/2002 -- -- 4138 -- <50 -- <0 50 <0 50 <050 <0 50 0 79[2] -- <br /> 03/06/2003 P -- 3920 — 62 -- 1 4 059 12 55 0 61[2] 4 0 <br /> 06/11/2003 P — 3880 — <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2]UJ 312 <br /> 09/24/2003 P -- 4281 -- <50 — <0 50 <0 50 <0 50 <0 50 0 62[2] -- <br /> 12/10/2003 P — 4141 — 150 — 18 20 37 25 0 60[2] -- <br /> 03/09/2004 P -- 3926 -- 1,000 -- 33 <0 5o 71 <0 50 3 8[2] 107 <br /> MS-2B 12/19/2002 - -- 4142 -- 170 -- 065 <0 50 <0 50 <0 50 <0 50[2] — <br /> 03/06/2003 P -- 3916 -- 87 -- 1 1 <0 50 0 99 4 6 <0 50[2] 31 <br /> 06/11/2003 NP -- 3869 -- <50 -- <0 50 <0 50 <0 50 <0 50 <0 50[2]UJ 419 <br /> 09/24/2003 — — 4261 -- <50 -- <0 50 <0 50 <0 50 <0 50 0 65[2] — <br /> 12/10/2003 P -- 4145 -- 110 -- 13 15 3 0 19 0 60[2] -- <br /> 03/09/2004 P -- 3923 -- 1,100 -- 29 <0 50 64 <0 50 50121 -- <br /> MS-3A 12/19/2002 — — 4126 — 190 — 4 <0 50 <050 <0 50 <0 50[2] -- <br /> 03/06/2003 P -- 3890 - <50 22 1 0 1 0 47 0 90[2] 1 8 <br /> 06/11/2003 P - 3815 <50 <0 50 <0 50 <0 50 <0 50 11 [2]J 377 <br /> 09!24/2003 P — 4217 — <50 -- <0 50 <0 50 <0 50 <0 50 0 63[2] — <br /> 12110/2003 P — 4127 — 140 -- 19 22 42 27 0 58[2] -- <br /> 03/09/2004 P -- 3793 — 1,100 -- 39 057 $a <0 50 2 9[2] 199 <br /> MS-3B 12/19/2002 -- -- 4184 — 1200 — 26 14 27 <0 50 7 1[2] -- <br /> 03/06/2003 P — 3923 — 1,100 -- 68 35 71 5 6 19[2) 2 0 <br /> 06/11/2003 NP -- 3849 — <50 — <0 50 <0 50 <0 50 <0 50 9 4[2]J 419 <br /> Report Date May 12,2004 Page 1 of 19 <br />