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i Table 1 Groundwater Monitoring Data 1995 to Present ARCO Service Station No 2130 7906 North El Dorado Street, Stockton, California Elevation Static Water Groundwater Ethyl- Total Well Top of Casing Top of Screen Level Elevation TPHG Benzene Toluene benzene Xylene MTBE Number Date (feet msl) (feet bgs) (feet bgs) (feet msl) tt L µg/L µg/L pglL [tg/L µglL Observations MW-8 02/28/95 14 16 5650 53 54 -3938 <50 <0 5 1 3 <0 5 <0 5 NA No FP,No S MW-8 05/19/95 14 16 51 66 -3750 55*** <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 08/28/95 1416 53 34 -39 18 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 12/07/95 1416 5202 -3786 <50 <0 5 <0 5 <0 5 <0 5 NA No FP,No S MW-8 02/05/96 NOT SAMPLED111 No FP,No S MW-8 05/30/96 NOT SAMPLEDI'1 No FP,No S MW-8 07/28/96 WELL DESTROYED MW-10 02/28/95 1438 5300 5424 -3986 300 09 <0 5 <0 5 <0 5 NA No FP,No S MW-10 05/19/95 1438 5232 -3794 370 09 <0 5 <0 5 <0 5 NA No FP,No S MW-10 08/28/95 1438 5370 -3932 420 1 2 <0 5 <0 5 <0 5 NA No FP,No S MW-10 12/07/95 1438 5261 -3823 490 07 <0 5 <0 5 <0 5 NA No FP,No S MW-10 02/05/96 1438 50 13 -35 75 350 07 <0 5 <0 5 <0 5 NA No FP,No S MW-10 05/30/96 1438 4709 -3271 350*** <6** <0 5 <0 5 <0 5 <6** No FP,No S MW-10 09/18/96 1438 5084 -3646 510 <15** 10 <0 5 <0 5 <9** No FP,No S MW-10 11/26/96 1438 4872 -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 MW-10 11/19/97 1439 4595 -31 57 510 22 22 093 3 1 <5 No FP,No S MW-10 03/04/98 1438 41 43 -2705 110 066 <0 5 <0 5 <0 5 <5 No FP,No S MW-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 85 407 689 <0 5 <0 5 0 873 195 No FP,No S MW-10 03/31/99 1438 3471 -2033 217 641 0 948 0 763 269 748 No FP,No S MW-10 06/04/99 1439 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 3 58 <0 5 <0 5 061 908 No FP,No S MW-10 03/16/00 1438 3469 -2031 270 074 <0 5 <0 5 <0 5 5 95 No FP,No S MW-10 06/26/00 1438 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 PA V 1LIONWyDocuments\ARCO121301QTRLY120001213OQ300 Delta Page 8 of 10 11122100