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Page 1 of 3 Table 3 Groundwater Monitoring Data and Analytical Results ARCO Serince Station 0595 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 8280) DO Number Sampled (ft MSL) (ft TOC) (ft MSL) Change h (ppb) (ppb) (ppb) (ppb) pb (ppb) (ppb) (m 1L) MW 1 6116/2000 NP 3555 5765 22 10 - 1 340 734 6 69 945 164 <12 5 <2 0 -- 911912000 NP 6068 25 13 303 2 990 189 102 676 115 -500 242 0 3 111212000 P 6074 25 19 -006 3 000 258 467 105 196 <25 0 2 5 2 9 315/2001 P 6090 2535 -0 16 4 250 479 Be 6 208 386 203 128 5 2 518!2001 P 6140 2585 -0 50 2 130 179 109 59 0 91 4 771 459 043 a112001 P 6317 2762 1 77 120 2 5 <0 50 <0 50 <0 50 28 12 1 53 10/2312001 P 64 53 28 98 1 36 770' <5 0 <5 0 <5 0 <5 0 39 37 030 2x112002 P 63 94 2839 069 520' 15 1 1 1 4 <0 50 29 3 1 053 411112002 P 6386 2630 009 2 100• 9< 20 45 68 90 19 055 7116 17M2 P 6512 2957 127 1 000 42 10 Is 32 36 26 24 10!2!2002 P 6748 31 93 236 440' 26 2 4 11 20 <2 5 <5 D 003 1117/2003 P 6680 31 25 0 68 4 200(a) 300 36 100 240 63 11 12S 4!412003 P 6647 3092 033 1 500 82 3 0 19 52 - <2 5 1 14 712212003 P 6323 2768 324 1 900 150 3 6 26 33 - <2 5 - 1011 212003 P 5930 3375 -607 2 500(b d) 420(b) <5 0(b) 38(b) 36(b) - <5 0(b) 016 118/2004 P 68 63 3308 0 67 3 000 860 <50 12 33 - <50 - MW 2 6116/2000 NP 3294 5572 22 78 - 855 28 0 882 2 58 194 179 116 -- 9119t2000 NP 5843 2549 2 71 495 3 64 -050 <0 50 145 76 0 936 D6 1112/2000 P 5942 2648 -0 99 428 126 <0 50 1 77 2 04 80 a 71 28 31512001 P 58 39 2545 103 476 287 1 08 8 37 277 74 0 601 4 9 51812001 P 59 65 26 11 -066 315 135 0 638 285 148 77 8 998 046 811/2001 P 6098 2804 193 630 59 6 1 11 16 60 76 1 36 1023r2001 P 62 34 2940 1 36 590 57 2 8 7 0 4 7 Be 65 026 2112002 P 6233 2939 001 280 14 1 7 2 6 3 9 79 66 0 30 411112002 P 61 36 2842 097 170 15 <D 50 <0 50 <0 50 68 64 0 48 7/1617/02 P 6280 2986 144 120 23 1 8 <0 50 1 6 84 69 2 3 101712002 NP - - - Dry Well— ------- 1/17/2003 NP 6430 31 36 - Insufficient Amount of Water to Sample Well-- -- 41312003 NP - - —---__—Dry Well------- 7721l2003 NP - -- - Dry Well---- ----- 1 01112 00 3 NP - - .. —Dry WBII— 11712004 NP - - _ ---- Dry Well--- --- MW 3 611612000 NP 3361 56 35 2274 - 226 289 <0 50 284 102 929 569 - 9/192000 NP 59 01 2540 2 6t5 217 0 582 <0 50 <0 50 <0 50 <2 5 <2 0 0 5 111212D00 P 6911 25 5D -0 10 162 -050 <0 50 <D 50 <0 50 120 11 1 3 3/5/2001 P 59 02 25 41 009 178 <0 500 <0 500 W 500 0 732 443 735 Be 5782001 P 5975 2614 -073 166 0 518 <0 500 -0500 0 711 2 96 393 0 60 8112001 P 61 56 2795 1 81 220 0 73 <0 50 <0 50 <0 50 -25 <2 0 1 05 1 02 312 0 0 1 P 6291 29 30 1 35 130 <0 50 <0 50 <0 50 <0 50 15 11 1 15 211/2002 P 6223 2862 0 68 92• 1 1 <0 50 1 1 0 81 8 6 4 3 0 74 4111/2002 P 6202 2841 021 120 062 <0 50 <0 50 -050 9 a 4 8 0 43 7116 17!02 P 6343 29 82 141 110 053 3 9 036 5 D 13 9 4 -- 1012/2002 P 6590 3229 247 880 6 5 38 <50 <5 0 <2 5 6 5 0 25 1/17/200 P 65 01 3140 0 89 110(a b) 19(b) <0 50(b) 0 67(b) 0 57(b) 12(b) 13 0 69 414/2003 P 64 52 3091 049 140 <0 50 <0 50 <0 50 <D 50 3 7 0 90 722/2003 P 65 72 3211 120 130 <0 50 <0 50 <0 50 <0 50 - 18 - 1011 22003 P 6771 34 10 199 110(b d) <1 0(b) <1 0(b) <1 0(b) -10(b) - 56(b) 0 57 1182004 P 6669 3308 102 100 068 <0 50 <0 50 060 - 0 91 - FAW-4 61'1612000 NP 3377 56 56 2279 - 8 910 2 310 -050 63 9 1 520 3 660 3200 911912000 NP 59 24 2547 2 68 18 900 2 240 <200 693 2 230 2 240 2 510 0 4 112/2000 P 5859 2482 065 9,230 1 740 <500 154 951 1 990 2200 1 7 315!2001 P 59 17 2540 -0 58 5 250 738 -200 33 5 <20 0 1 870 1 760 4 2 5182001 P 59 84 2607 -067 2 690 875 <200 344 <20 0 2 350 2 140 0 50 81112001 P 61 83 28 06 1 99 750 19 <2 5 6 6 <2 5 640 1 400 000 101232001 - - — --------------_--Dry Well -------- — 21112002 P 61 58 27 81 - <500 <50 <5 0 <60 <5 0 770 690 028 41112002 P 62 14 2837 056 280' 1 7 -060 <0 50 <D 50 54 670 0 71 7116 17102 P 6261 2874 037 Insufficient Amount of Water to Sample WBII--- 22 101212002 P 6265 28 88 014 Insufficient Amount of Water to Sample Well--- » 1117!2003 NP 6778 2901 013 --InsufBciant Amount of Water to Sample Well---- - 4f32003 NP - - - ----Dry Well------»-»— --- 712112003 NP 6273 2096 Insufficient Amount of Water to Sample Well »----- 10/112003 NP - - - ------»--------Dry Well —... 11812004 P 6280 - - »»-----Insufficient Amount of Water to Sample Well-- M W 5 81112001 P 3225 6052 2827 - <50 -050 <0 50 <0 50 <0 50 <2 5 2 6 3 51 101232D01 P 6166 2961 1 34 <50 <0 50 40 5C <0 50 <0 50 <2 5 <1 0 0 98 21112002 P 6093 2868 0 93 <50 <0 50 <0 50 <0 50 <D 50 <2 5 <0 50 089 41112002 P - - ------»»-»Not Accessible---- 711612002 -----.711612002 P 6228 3003 - <50 <0 50 <0 50 <0 50 -050 <2 5 1 2 3 2 . 101212002 P 64 82 3257 2 54 <50 <0 50 <D 50 <0 50 .050 - 070 010 1/17/2003 P 6360 31 35 1 22 <50 <0 50 <0 50 <0 50 <0 50 <2 5 0 85 1 35 4132003 P 6301 3076 059 <50 <0 50 <0 50 <0 50 <D 50 1 2 114 7/2212003 P 6476 3251 1 75 <50 -060 <0 50 <0 50 <D 50 1 2 1011 22003 P 6645 34 20 169 <50(b) <0 50(b) 0 97(b) <0 50(b) <0 50(b) - 0 52(b) 1 25 11812004 P 65 34 3309 1 11 <50 1 1 <0 50 '050 -050 - o Be - I 15AR=05951TablesLSCMITable 3 Groundwater Momtonng Data and Analytical Results x!s 4116!2004