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Table 1 Groundwater Elevation and Analytical Data ARCO Service Staban*595 6100 N Highway 99 Stockton CA Well Depth Groundwater Groundwater Ethyl Xylenes MtBE MtSE Well Date Elavaton to Water Elevabon Elevation TPHg Benzene Toluene benzene (total) (EPA 8020) (EPA 6260) DO Number Sampled (ft MSL) (ft,TOC) (ft,MSL) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) ( 1L) MW-6 8/1/2001 P 3020 5860 2840 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 <2 0 364 10123/2001 P 5977 29 57 -1 17 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1 0 162 2/1/2002 P 5838 -2818 139 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 094 4111/2002 P 5844 -2824 -0 06 <50 <0 50 065 <0 50 <0 50 <2 5 <0 50 2 59 7/162002 P 60 23 -30 03 -179 <50 087 30 <0 50 18 4 6 1 5 — 1022002 P 62 90 -3270 -2 67 <50 <0 50 <0 50 <0 50 <0 SO — <0 50 106 1/1712003 P 6092 -3072 198 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 198 4/3/2003 P 6066 3046 026 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 175 7!2212003 P 6289 -3269 -223 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 1011 W003 P 6475 -3455 -186 <50(b) <0 50(b) 0 56(B) <0 50(b) <0 50(b) — <0 50(b) 180 1182004 P 6328 -3308 147 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — 41212004 P 6258 32 38 0 70 <50 <0 50 <0 50 <0 50 <0 50 — <0 50 — MW-7 6/1/2001 P 3252 6057 28 05 — <50 <0 50 <0 50 <0 50 <0 50 61 94 107 1023!2001 P 6194 -2942 -137 <50 <0 50 <0 50 <0 50 <0 50 110 100 023 2/1/2002 P 6104 -28 52 0 90 <50 <0 50 <0 50 <0 50 <0 50 100 85 015 4/112002 P BO 87 -28 35 017 <50 <0 50 13 <0 50 089 58 56 092 711617102 P $242 -2990 -155 57' <0 50 18 <0 50 19 96 87 30 1022002 P 64 95 3243 -253 <50 <0 50 <0 50 <0 50 <0 50 <2 5 130 014 1/172003 P 6383 -3131 112 68(c) <0 50 <0 50 <0 50 <0 50 7$ 62 0 78 4!312003 P 6337 -3085 046 <100 <1 0 <1 0 <1 0 <1 0 — 78 1 10 7222003 P 6486 32 34 -149 <100 <1 0 <1 0 <1 0 <1 0 — 99 — 10H 22003 P 6674 34 22 -188 <1 200(b d) <12(b) <12(b) <12(b) <12(b) — 99(b) 031 118/2004 P 65 62 3310 112 110 <1 0 <1 0 <1 0 <1 0 — 76 — 4I212004 P 6522 4170 0.40 <260 <2 5 <2 5 <2.5 <2 5 — 99 — MW-8 7/162002 P 3310 6327 3017 — <50 <0 50 0 81 <0 50 <0 50 18 15 -- 1022002 P 6609 3299 -282 <50 <0 50 <0 50 <0 50 <0 50 <2 5 3 8 0 85 1/172003 P 64 66 -3156 143 <50 <0 50 <0 50 <0 50 <0 50 2 7 26 169 4132003 P 6412 -3102 054 <50 <0 50 <0 50 <0 50 <0 50 — 4 6 168 7222003 P 6607 -32 97 195 <50 <0 50 <0 50 <0 50 <0 50 — 6 9 — 1011 22003 P 67 96 -34 86 1 89 <50(b) <0 50(b) 1 4(b) <0 50(b) 0 76(b) — 2 7(b) 151 1IM004 P 6641 -3331 155 <50 <0 50 <0 50 <0 50 <0 50 — 24 — UM004 P 66 06 -3 296 035 <50 <0 50 <0 50 <0 5o 067 — 4 6 — MW 9 7/162002 P 3372 6355 -2983 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 093 34 1022002 P 6617 -3245 -262 <50 <0 50 <0 50 <0 5o <0 50 — 0 55 010 11172003 P 65 01 -3129 1 16 <50 <0 50 <0 50 <0 50 <0 50 <2 5 0 61 123 4132003 P 6455 -3003 046 <50 <0 50 <0 50 <0 50 <0 50 — 057 090 71222003 P 6610 -3238 -155 <50 <0 50 <0 50 <0 50 <0 50 — 0 62 — 10/12003 NP Unable to Access Car Parked Over Well 182004 NP Unable to Access,Car Parked Over Well 4/212004 P 663S -32.63 — <50 <0 So 12 <0 60 13 — <0 SO — t 7rolectsiARC045951Reports4Tablesl2Q04gwtables595 As