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Jv 40 Page 2 of 7 I Table 5 Groundwater Elevation and Analytical Data Former ARCO Service Station#4932 16 E Harding Way Stockton CA Well Depth Groundwater LPH Groundwater Ethyl- Xylenes MTBE MtBE I Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (802018260) DO kk Number Sampled (ft MSL) (ft TOC) (ft,MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg1L) 4 MW-3 01/30/03 P 3036 -18 66 000 0 81 1 100 43 22 33 49 20 0 55 093 (cont) 04128/03 P 2970 -18 00 000 066 1,000 34 22 45 92 -- 0 88 2 38 07129103' P 31 10 -1940 000 -140 76 000 5 2 300 6 500 3,000 10 000 — <500 — 10/08/03 P 3265 -2095 000 -155 <50 <0 50 <0 50 <0 50 <0 50 — 0 76 — 01113104 P 3214 -20 44 000 0 51 <50 <0 50 <0 50 <0 50 <0 50 -- 079 — MW-4 09/05/00 P 11 98 26 63 -1465 000 — 166,000 10 500 43 600 5 230 25,400 708 000 — — 11/02/00 P 2732 -1534 000 -069 180 000 9 400 42 600 5 260 26,900 376 000 350 000 3 3 03105/01 P 2663 -1465 000 0 69 165 000 10,700 45 300 5 020 26 500 596 000 466 000 4 2 05108/01 P 2626 -1428 000 037 149 000 9 660 45 300 5 280 26 800 372 000 500 000 044 07120/01 P 2741 -1541 ' 002 -1 13 Not sampled 0 02 ft LPH present 10/22/01 2992 -1759 4 046 218 Not sampled 0 46 ft LPH present 01115/02 P 2991 -1793 0 00 -0 34 140,000 7,900 39,000 6 000 29,000 77,000 90,000 22 04/11/02 P 2710 -1512 0 00 2 81 140 000 9 700 33 000 8 100 37,000 180,000 160 000 — 07112/02 P 2921 -1723 000 -211 210 000 7 100 31 000 10 000 41,000 190 000 150 000 2 6 11120/02 P 3164 -1966 0 00 -243 140 000 6,300 250 000 4 000 19 000 58,000 67 000 001 01130/03 — — — — Well unable to be sampled connected to remedial system 04/28/03 — — — — — Well unable to be sampled connected to remedial system 07129103' P 3104 -1906 0 00 120 000 e 8 900 12 000 3 800 12,000 -- 12 000 — 10117/03 P 3295 -2097 Goo — 21 000 1 500 2 700 810 4 100 — 7200 — 01113/04 NP Not gauged well dry on 01/12/04 28,000 220 550 110 460 -- 33 — MW-5 07120101 P 1178 27 77 -1599 000 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 — 10122101 P 2972 -17 94 000 -1 95 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 1 12 01/15/02 P 2907 -1729 000 065 <50 <0 50 18 <0 50 1 2 3 8 17 2 8 04/11/02 P 2829 -1651 000 078 <50 <0 50 <0 50 <0 50 <0 50 3 32 40 07/12/02 P 2929 -1751 000 -100 <50 <0 50 0 62 <0 50 <0 50 18 12 2 7 11/20/02 P 3189 -2011 000 -260 <50 <0 50 <0 50 <0 50 <0 50 35 31 017 01130/03 P 3120 -1942 000 069 <50 <0 50 <0 50 <0 50 <0 50 13 14 140 04/28/03 P 3046 -1868 000 074 <50 <0 50 <0 50 <0 50 061 — 39 182 07!29103` P 3183 -2005 000 -1 37 <50 000 5 1 300 3 800 1 800 5 900 — <500 -- 10/08/03 3334 -2156 000 -1 51 <50 <0 50 12 <0 50 1 3 -- 21 — 01/12/04 P 3294 -21 16 000 040 <50 <0 50 <0 50 <0 50 <0 50 — 21 — ProlectlARC014932!Reports/Tables/gwtables4932-1004