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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 Toluene benzene Xylene MTBE Number Date (feet msl) (feet bgs) (feet b s) (feet rnsl) ug/L lig/L gg/L µgIL L µgll- Observations MW-5 08/28/95 15 10 5900 5461 -3951 130 27 <0 5 4 5 0 6 NA No FP,No S MW-5 12/07/95 15 10 53 20 -38 10 <200** 2 1 <0 5 0 7 <0 5 NA No FP,No S MW-5 02/05/96 15 10 5067 -35 57 <200** 3 0 <0 5 0 9 <0 5 NA No FP,No S MW-5 05/30/96 15 10 4770 -3260 140*** 15 <0 5 5 2 <0 5 <4** No FP,No S MW-5 09/18/96 15 10 51 56 -3646 <300*** 33 <0 5 9 0 <0 5 <3 No FP,No S MW-5 11/26/96 15 10 4934 -3424 <200*** 19 <0 5 05 <0 5 <4** No FP,No S MW-5 03/24/97 15 10 4424 -2914 <200*** 3 2 <0 5 16 3 0 <8** No FP,No S MW-5 05/20/97 15 10 4485 -2975 270 31 5 0 5 0 15 <20** No FP,No S MW-5 08/19/97 15 10 4837 -3327 100 20 <0 5 3 8 <0 5 <5 No FP,No S MW-5 11/19/97 15 10 4662 -31 52 <50 12 094 <0 5 0 91 <5 No FP,No S MW-5 03/04/98 15 10 4190 -2680 <50 5 6 1 8 16 3 1 <5 No FP,No S MW-5 06/26/98 15 10 3964 -2454 <50 4 19 0 624 0 794 0 999 <5 No FP,No S MW-5 09/01/98 15 10 4144 -2634 <50 13 2 <0 5 1 39 0 535 5 15 No FP,No S MW-5 12/02/98 15 10 3874 -23 64 <50 0 693 <0 5 <0 5 <0 5 894 No FP,No S MW-5 03/31/99 15 10 35 17 -2007 <50 133 0 586 <0 5 152 9 94 No FP,No S MW-5 06/04/99 15 10 3648 -2138 <50 5 03 0 721 <0 5 16 706 No FP,No S MW-5 09/02/99 15 10 4105 -2595 <50 6 14 <0 5 183 0 848 <5 No FP,No S MW-5 11/29/99 15 10 39 16 -2406 <50 0 585 0 633 <0 5 1 45 269 No FP,No S MW-5 03/16/00 15 10 35 16 -2006 57 5 170 <0 5 <0 5 <0 5 4 93 No FP,No S MW-5 06/26/00 15 10 37 80 -2270 523 369 <0 5 2 2 0 825 <2[2] No FP,No S MW-5 09/28/00 15 10 4205 -2695 <50 134 <0 5 <0 5 <0 5 <2[2] No FP,No S PAVILION\MyDocuments\ARCO\2130\QTRLY\200012130Q300 Delta Page 5 of 10 11/22100