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Table 1 Groundwater Monitoring Data ARCO Service Station No 2188 3212 North California Street Stockton,California Elevationof StatirWater[l] op of Ele7a—tion or Tota Well Top of Casing Level Screen[2] Groundwater Groundwater TPHG Benzene Toluene Ethylbenzene Xylenes MTBE[3] Sample No Date (feet msl) feet b s) (feet b s) feet msl Flow Direction pg/L pg/L pg/L Itg/L µg/L µg/L Observations MW-3 09/25/95 1455 5790 5530 4335 SE <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 10/23/95 1455 NM NM NA NA NA NA NA NA NM MW-3 12/22/95 1455 5359 -3904 E <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 02/16/96 1455 4999 -3544 E <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-3 05/23/96 1455 45 19 -3064 E <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 09/19/96 1455 5326 -3871 NE <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 11/27/96 1455 5051 -3596 SE <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 03/21/97 1455 4197 -2742 SE <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 05/22/97 1455 4361 -2906 E-NE <50 <0 5 <0 5 <0 5 <0 5 <3 No FP,No S MW-3 08/20/97 1455 4943 -3488 E-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 11/20/97 1455 4882 -3427 E <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 02/17/98 1455 44 18 -2963 E-SE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 06/24/98 1455 3559 -2104 E <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 09/21/98 1455 3907 -2452 E-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 12/14/98 1455 37 14 -2259 E-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 03/31/99 1455 3422 -1967 N-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 06/11/99 1455 3401 -1946 E-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 09/10/99 1455 38 10 -23 55 E-NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 12/03/99 1455 38 12 -23 57 E <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S MW-3 04/03/00 1455 3485 -2030 NE <50 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-3 06/22/00 1455 3490 -2035 E <50 <2 <2 <2 <2 <2[4] No FP,No S MW-3 08/27/00 1455 4007 -25 52 E-NE <50 <0 5 <0 5 <0 5 <0 5 4 98[4] No FP,No S MW-4 11/20/97 13 83 4836 4500 -3453 E 89 10 1 1 063 20 11 No FP,No S MW-4 02/17/98 13 83 4355 -2972 E-SE 180 057 <0 5 <0 5 059 29 No FP,No S MW4 06/24/98 13 83 3506 -2123 E <50 <0 5 <0 5 <0 5 <0 5 162 No FP,No S MW-4 09/21/98 13 83 3867 -24 84 E-NE 131 <0 5 <0 5 1 15 167 262 No FP,No S MW-4 12/14/98 13 83 3661 -2278 E-NE 136 108 <0 5 <0 5 <0 5 29 1 No FP,No S MW4 03/31/99 13 83 3385 -2002 N-NE <50 <0 5 <0 5 <0 5 <0 5 796 No FP,No S MW-4 06/11/99 13 83 3347 -1964 E-NE 194 <0 5 <0 5 <0 5 <0 5 41 No FP,No S MW-4 09/10/99 13 83 3772 -23 89 E-NE 213 148 <0 5 <0 5 <0 5 1,100 No FP,No S MW-4 12/03/99 13 83 3764 -23 81 E 64 1 <0 5 <0 5 <0 5 <0 5 731 No FP,No S MW-4 04/03/00 13 83 3430 -2047 NE <50 <0 5 <0 5 <0 5 <0 5 166 No FP,No S MW-4 06/22/00 13 83 3437 -2054 E 232 <2 <2 <2 <2 2,070[4] No FP,No S MW4 09/27/00 1383 3980 -2597 E-NE 185 160 <0 5 0 542 I 17 6,590[4] No FP,No S I ' 1 PAV]LfOT MyOocumentslARCOV21B6IQTRLY\2000\2186Q300 Delta 2 of 3 11129/00