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4 rJ Page 5 of 7 Table 5 v Groundwater Elevation and Analytical Data Former ARCO Service Station#4932 16 E Harding Way Stockton CA Well Depth Groundwater LPH Groundwater Ethyl- Xylenes MtBE ME Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (802018260) DO Number Sampled (ft MSL) (ft,TOC) (ft MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg1L) DMW-1 04111/02 P 1198 2810 -1612 0 00 -- <500 96 <5 0 <50 <5 0 230 140 — 07112/02 P 2925 -1727 0 00 -1 15 55 <0 50 <0 50 <0 50 <0 50 72 64 2 7 11120/02 P 3164 -1966 0 00 -2 39 <50 0 76 063 <0 50 15 18 21 016 01/30/03 — — — — — Well unable to be sampled located in construction area 04128/03 P 3020 -1822 000 — <50 <0 50 <0 50 <0 50 <0 50 — 13 274 07!28103* P 3164 -1966 000 — 50 5 <0 50 <0 50 <0 50 <0 50 — 52 — 10108/03 3323 -21 25 000 -1 59 <50 <0 50 063 <0 50 081 — 33 — 01/13104 P 3271 -2073 000 0 52 <50 <0 50 <0 50 <0 50 <0 50 — 2 5 — DMW-2 07/12/02 P 11 10 2836 -1726 000 — <50 10 1 6 062 2 0 130 8 5 2 8 11/20/02 P 30 84 -19 74 000 -248 <50 <0 50 <0 50 <0 50 12 41 64 327 01/30/03 P 30 04 -18 94 000 080 <50 <0 50 <0 50 <0 50 <0 50 40 33 521 04/28/03 P 2933 -1823 000 0 71 <50 <0 50 <0 50 <0 50 <0 50 — 0 76 175 07128103* P 3088 -19 78 000 -155 <50 5 <0 50 <0 50 <0 50 0 61 — <0 50 — 10/08/03 3241 21 31 000 -153 <50 <0 50 0 91 <0 50 1 1 — <0 50 — 01113/04 P 3188 -2078 000 0 53 53 9 6 2 4 0 82 31 — 13 — DMW-3 07/12/02 P 1149 2894 -1745 000 — 90 `* <0 50 1 3 <0 50 10 1600 140 2 7 11/20/02 P 3147 -1998 000 -253 <50 <0 50 063 <0 50 16 14 16 1,57 01/30103 P 3070 -1921 000 0 77 <50 <0 50 <0 50 <0 50 055 32 3 7 435 04/28/03 P 29 98 -1849 000 0 72 <50 <0 50 <0 50 <0 50 <0 50 — 5 9 313 07128103* P 31 5o -2001 000 -1 52 <50 5 <0 50 <0 50 <0 50 <0 50 — 3 0 — 10/08/03 3305 -2156 000 -1 55 <50 <0 50 090 <0 50 1 1 — 2 4 — 01/13/04 P 32 49 -2100 000 056 <50 <0 50 <0 50 <0 50 <0 50 — 1 1 -- EW-1 04/11/02 P 1183 2795 -1612 000 — <200 000 9 900 40 000 4 700 24 000 550 000 520 000 -- 07112l02 P 29 04 -1721 000 -109 350 000 13 000 49,000 6 100 34 000 320 000 460 000 2 7 11/20/02 NP 3147 -1964 000 -243 Not sampled LPH sheen present 01/30/03 P 2930 -1747 000 2 17 220 000 8 000 31 000 4 400 23 000 140 000 200 000 083 04/28/03 P 29 58 -1775 000 -028 Well unable to be sampled connected to remedial system 07129103' NP 3109 -1926 000 -151 220 000 5 3 700 11 000 3200 16 000 — 97 000 — 10/08/03 4090 -2907 0 00 -981 37 000 1 100 1 600 360 2 400 25 000 — 01112104 NP 3911 -2728 0 00 179 11,000 T <250 <250 <250 280 — 17,000 — EW 2 07/12/02 P 1122 28 51 -1729 0 00 — <50 000 <500 <500 <500 <500 56 000 65 000 2 8 11/20/02 P 3120 -19 98 000 -2 69 45 000 2 <100 <100 <100 <100 71,000 90,000 000-003 01/30/03 P 3045 -1923 000 0 75 12,000 2 <50 <50 <50 <50 52,000 61,000 — 04/28/03 P 29 72 -18 50 000 073 51 000 a <500 <500 <500 <500 — 55 000 1 52 07/29/03* P 3122 2000 000 -1 50 87 000 5 <500 <500 <500 <500 -- 50,000 — 10108/03 3277 -21 55 000 -1 55 <50 000 <500 <500 <500 <500 — 23 000 — 01/13104 P 3221 -2099 000 0 56 15,000 <1,000 <1,000 <1,000 <1,000 — 38,000 -- ProjectlARCO/4932!Reports/Tables/gwtables4932-1 Q04