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Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North EI Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Top of Screen Level Elevation TPHG Benzene 3 oluene benzene Xylene MTBE Number Date feet msl feet bgs) (feet bgs) (feet ms1) f L L L µ L µg/L µ L Observations MW-8 02/28/95 14 16 5650 5354 -3938 <50 <0 5 13 <0 5 <0 5 NA No FP,No S MW-8 05/19/95 1416 5166 -3750 55*** <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 08/28/95 14 16 5334 -39 IS <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 12/07/95 1416 5202 -3786 <50 I <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 02/05/96 NOT SAMPLED ' No FP,No S MW-8 05/30/96 NOT SAMPLEDI'l No FP,No S MW-8 07/28/96 WELL DESTROYED AIW-10 02/28/95 1438 5300 5424 -39 86 300 0 9 <0 5 <0 5 <0 5 NA No FP,No S MW-10 05/19/95 1438 5232 -3794 370 0 9 <0 5 <0 5 <0 5 NA No FP,No S MW-10 08/28/95 1438 53 70 -3932 420 1 2 <0 5 <0 5 <0 5 NA No FP,No S MW-10 12/07/95 1438 5261 -3823 490 0 7 <0 5 <0 5 <0 5 NA No FP,No S MW-10 02/05/96 1438 50 13 -35 75 350 0 7 <0 5 <0 5 <0 5 NA No FP,No S NIW-10 05/30/96 1438 4709 -3271 350*** <6** <0 5 <0 5 <0 5 <6** No FP,No S NIW-10 09/18/96 14 38 5084 -3646 510 <15** to <0 5 <0 5 <9** No FP,No S NIW-10 11/26/96 1438 48 72 -3434 <600*** <0 5 <0 5 <0 5 <0 5 <10** No FP,No S MW-10 03/24/97 1438 4377 -2939 <500*** <5** <0 8** <0 5 <0 5 <7** No FP,No S MW-10 05/20/97 1438 4420 -2982 460 <5** <0 5 <0 5 <0 5 <7** No FP,No S MW-10 08/19/97 1438 4766 -3328 440 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S NIW-10 11/19/97 1438 4595 -3157 510 2 2 2 2 093 3 1 <5 No FP,No S AIW-10 03/04/98 1438 4143 -2705 Ito 066 <0 5 <0 5 <0 5 <5 No FP,No S AIW-10 06/26/98 1438 39 11 -2473 329 475 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 09/01/98 1438 4078 -2640 295 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 12/02/98 1438 3823 -23 85 407 6 89 <0 5 <0 5 0 873 19 5 No FP,No S NIW-10 03/31/99 1438 3471 -2033 217 641 0 948 0 763 269 748 No FP,No S MW-10 06/04/99 1438 35 86 -2148 288 <0 5 <0 5 <0 5 <0 5 653 No FP,No S MW-10 09/02/99 1438 4026 -25 88 152 <0 5 <0 5 <0 5 <0 5 <5 No FP,No S MW-10 11/29/99 1438 3858 -2420 198 358 <0 5 <0 5 061 9 08 No FP,No S NNW-10 03/16/00 1438 3469 -2031 270 074 <0 5 <0 5 <0 5 595 No FP,No S MW-10 06/26/00 14 38 3705 -2267 389 <0 5 <0 5 <0 5 <0 5 <2[2] No FP,No S MW-10 09/28/00 1438 4128 -2690 <50 0 870 <0 5 <0 5 <0 5 <2[2] No FP,No S MW-10 12/19/00 14 38 3720 -2282 <50 <0 5 <0 5 <0 5 <0 5 <2 5 No FP,No S C 1ARC0121301QTRLY000012130g400 xis Delta 8 of 10 1/30/01