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�e2of5 7 Table 1 n Groundwater Elevation and Analytical Data ARCO Seance Station#595 6100 N Highway 99 Stockton CA Well Depth Groundwater Groundwater Ethyl Xylenes MtBE MtBE Well Date Elevation to Water Elevation Elevation TPHg Benzene Toluene benzene (total) (EPA 8020) (EPA 8260) DO Number Sampled (ft MSL) (ft TOC) (N MSL) Change(ft) (ppb) (ppb) (ppb) (Ppb) (ppb) (ppb) (ppb) (mg1L) M W 3 6/16/2000 NP 3361 56 35 22 74 225 2 89 <0 50 _2134 102 929 8 69- — 9/1912000 NP 5901 2540 2 66 217 0 582 <0 50 <0 50 <0 50 <2 5 <20 0 5 11/2/2000 P 5911 2550 -010 162 <0 50 <0 50 <0 50 <0 50 120 11 13 3/5/2001 P 5902 2541 009 178 <0 500 <0 500 <0 500 0 732 443 7 35 5 6 5/8/2001 P 5975 -2614 -073 166 0 515 <0 500 <0 500 0 711 2 96 393 060 8/1/2001 P 6156 -2795 1 81 220 073 <0 50 <0 50 <0 50 <25 <20 105 10!2312001 P 62 91 2930 135 130 <0 50 <0 50 <0 50 <0 50 15 11 1 15 2!112002 P 6223 2862 068 92 i 1 <0 50 1 1 0 51 6 6 4 3 074 4/11/2002 P 6202 28 41 021 120 0 52 <0 50 <0 50 <0 50 9 8 4 8 043 711617/02 P 6343 2982 141 110' 0 53 3 9 086 so 13 9 4 — 1012/2002 P 65 90 32 29 247 860' 6 5 38 <5 0 <5 0 <2 5 6 5 0 25 1/17/2003 P 6501 71 40 089 110(a b) 1 9(b) <0 50(b) 0 67(b) 0 57(b) 12(b) 13 0 69 4/4/2003 P 6452 30 91 049 140 <0 50 <0 50 <0 50 <0 50 3 7 0 90 7/22/2003 P 6572 3211 120 130 <0 50 <0 50 <0 50 <0 50 is — 1011,212003 P 6771 3410 -199 110(b,d) <1 0(b) <1 0(b) <1 0(b) <1 0(b) — 56(b) 0.57 MW-4 6/16/2000 NP 33 77 56 56 2279 8 910 2 310 <0 50 83 9 1 520 3 680 3200 91t912000 NP 5924 2547 268 18 900 2 240 <20 0 693 2,230 2 240 2 510 0 4 11/2/2000 P S859 24 82 065 9 230 1 740 <50 0 154 951 1990 2200 17 3/5/2001 P 5917 2540 058 5 250 738 <20 0 335 <20 0 1 870 1 760 4 2 5/8/2001 P 5984 2,607 -067 2 890 875 <20 0 34 4 <20 0 2 350 2 140 050 8/1/2001 P 6183 28 06 199 750 19 <2 5 66 <25 640 1 400 0 00 10/23/2001 — _ _ — __ —---Dry Well --------------- — —-- 2/1/2002 P 6168 -2781 — <500 <5 0 <50 <5 0 <5 0 770 690 0 28 4/11/2002 P 62 t4 28 37 -0 56 280 17 <0 50 <0 50 <0 50 54 670 0 71 7/1617/02 P 6251 2874 -0 37 -- —Insufficient Amount of Water to Sample Well 2 2 1002002 P 6265 2888 -014 ——Insufficient Amount of Water to Sample Well — ---- 1/17/2003 NP 6278 29 01 013 Insufficient Amount of Water to Sample Well — 4/312003 NP — — »» -- — — --Dry Well — — — — 7/21/2003 NP 6273 2896 --—Insufficient Amount of Water to Sample Well — — — 10/112003 NP — — — Dry Well MW 5 8/112001 P 3225 6052 2827 — <50 <0 50 <0 50 <0 50 <0 50 <2 5 2 6 3 51 10123/2001 P 6186 2961 134 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1 0 096 211!2002 P 6093 -28 68 0 93 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 089 4111 r,1002 P -- — — — — — — ----—Not Accessible—— — —— ---- 7/16/2002 P 6228 3003 <50 <0 50 <0 50 <0 50 <0 50 <2 5 1 2 32 10/2/2002 P 6482 3257 2 54 <50 <0 50 <0 50 <0 50 <0 50 0 70 010 1/17/2003 P 63 60 3135 1 22 <50 <0 50 <0 50 <0 50 <0 50 <2 5 0 85 135 4/3/2003 P 6301 3076 059 <50 <0 50 <0 50 <0 50 <0 50 1 2 1 14 7122/2003 P 6476 32 51 175 <50 <0 50 <0 50 <0 50 <0 50 1 2 1011,212003 P 6645 3420 169 <60(b) <0 50(b) 0 97(b) <0 50(b) <0 50(b) — 0 52(b) 125 11ProleclslARCO15951ReportslTables44O03gwtabies595 As