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Page 2 of 3 Table 3 Groundwater Monitoring Data and Analytical Results ARCO Service Station 8595 6100 N Highway 99 Stockton CA Well Depth Groundwater Groundwater Ethyl Xylenes M1BE MtBE Well Date Elevation to Water 6levaaon Elevation TPHit Benzene Toluene benzene (total) (EPA 8020) (EPA 6260) DO Number Sampled (ft MSL) (it TOC) (fl MSL) Chane(it) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb (ppb) m L MW-6 811/2001 P 30 2D 58 60 28 40 <50 <0 50 -050 <0 50 <0 50 <2 5 <2 0 364 10!2312001 P 5977 2957 117 <50 <0 50 <0 50 <0 50 -050 -25 2/112002 P 5838 2818 1 39 <50 -050 <0 50 <0 50 <0 50 <2 5 <0 50 094 41'1112002 P 58 44 2824 0 06 <50 <0 50 065 <0 50 -050 <2 5 <0 50 2159 711612002 P 6023 3003 179 <50 087 3 0 <D 50 1 a 4 6 1 6 -- 1 D02002 P 62 90 -3270 267 <50 -050 -050 <0 50 <0 50 - <0 50 106 111712003 P 6092 3072 1 98 <50 <0 50 <0 50 <0 50 <O 50 -25 <0 50 198 41312003 P 6066 3046 026 <50 <0 50 <0 50 <0 50 <O 50 - <0 50 175 712212003 P 6269 32 69 223 <50 <0 50 <0 50 <0 50 <0 50 <050 - 1011 212003 P 6475 3455 180 <50(b) <0 50(b) 0 56(8) <0 50(b) <0 50(b) - <O 50(b) ISO 11812004 P 6328 3308 147 <50 <0 50 <0 50 <0 50 <0 50 - <0 50 -- MW 7 8/112001 P 3252 60 57 28 05 - <50 <0 50 <0 50 <0 50 <0 50 61 94 107 1 012 3120 01 P 61 94 2942 137 <50 <0 50 <0 50 <Q 50 <0 50 110 100 023 2/1/2002 P 61 04 26 52 090 <50 <0 50 <0 50 <0 50 <0 50 100 85 015 411 112 00 2 P 60 87 28 35 017 <50 -050 1 3 <0 50 0 89 58 55 002 7116 17102 P 6242 2990 155 57 <0 50 1 8 <D 50 19 96 87 3 0 10121'2002 P 64 95 3243 253 <50 <0 50 <0 50 <D 50 -050 -25 130 014 111712003 P 63 83 31 31 112 68(e) -050 <0 50 <0 50 <0 50 75 82 0 78 4/3/2003 P 6337 30 85 046 <100 0 0 0 0 <1 0 <1 0 78 1 10 712212003 P 6486 32 34 149 <100 0 0 <1 0 <1 0 <1 0 - 99 - 10fl 212003 P 6674 3422 188 <7 200(b d) <12(b) <12(b) <12(b) <12(b) - 99(b) 031 1IM004 P 65 62 3310 112 110 <1 0 <1 0 <1 0 -10 -- 76 - MW 8 771612002 P 33 10 6327 3017 - <50 <0 50 0 81 <0 50 -050 18 15 - 101212002 P 6609 3299 262 <50 <0 50 <0 50 <0 50 <0 50 <2 5 38 0 BS 111712003 P 6466 31 56 1 43 <50 <0 50 <0 50 -050 <0 50 27 28 1 89 413/2003 P 64 12 31 02 054 <50 <0 50 <0 50 <0 50 <0 50 46 1 88 7/2212003 P 6607 3297 1 95 <50 <O 50 <D 50 -050 <0 50 - 69 - 1011 2/2003 P 6796 3486 1 59 <50(b) <0 50(b) 1 4(b) <0 50(b) 0 76(b) - 2 7(b) 1 51 118/2004 P 6641 3331 155 <50 <0 50 -050 <0 50 <0 50 - 24 - MW 9 711612OD2 P 3372 6355 2983 » <50 <0 50 <0 50 <0 50 <0 50 <2 5 093 34 1 D12120D2 P 6617 3245 2 62 <50 <O 50 <O 50 -050 -050 D55 0 1 D 1 11 712 0 0 3 P 6501 31 29 116 <50 <0 50 -050 <0 50 <0 50 <2 5 061 123 41372003 P 54 55 30 63 045 <50 <0 50 <0 50 <0 50 <0 50 05T 090 7/2212003 P 6610 3238 1 55 <50 <0 50 <0 50 <O 50 <0 50 062 10/112003 NP —Unable to Access Car Parked Over Well--- V712004 NP ---—--—--Unable to Access Car Parked Over Well-- --— MW 10 7116/2002 P 31 27 61 16 2989 - <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 28 1012!2002 P 6360 3233 244 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 010 111712003 P 6270 3143 090 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <0 50 175 4/312003 P 6220 3093 0 50 <50 <0 50 <0 50 <0 50 <0 50 - -050 097 712212003 P 6349 3222 1 29 <50 <0 50 e0 50 <0 50 <0 50 <0 50 - 1011 212003 P 6512 3385 1 63 <50(b) <0 50(b) 1 2(b) <0 50(b) 0 82(b) - <0 50(b) 122 118/2004 P 64 33 3306 079 <50(e) <0 50(e) <0 50(e) <0 50(e) <0 50(e) - <0 50(a) - OMW 1 7116 17f02 P 3430 6443 3013 - <50 <0 50 26 D 51 2 8 38 23 27 10/212002 P 6681 32 5t 2 38 <50 -050 '050 <0 50 <0 50 <2 5 27 D28 1!1712003 P 0570 3140 1 11 <50 <0 50 <0 50 <0 50 <O 50 41 4 8 147 41472003 P 6533 3103 0 37 <50 <0 50 <0 50 <0 50 <0 50 - so 1 53 712212003 P 6682 3252 1 49 <50 <0 50 <O 50 <0 50 -050 46 -- 1011 212003 P 6533 3403 1 51 <50(b) <0 50(b) <0 50(b) <0 50(b) <0 50(b) 24(b) 069 118/2004 P 6744 3314 089 58(a) <0 50(e) <0 50(e) <0 50(e) <0 50(e) 39(e) - DMW 2 7116 17/02 P 3362 7315 3953 -- <50 <0 50 2 2 <0 50 20 17 12 2 5 101212002 P 6607 3245 708 <50 <0 50 -050 <O 50 <0 50 - 94 026 111712003 P 6590 3228 017 <50 <0 50 <0 50 <0 50 <0 50 so 71 1 89 41412003 P 6461 3099 129 <50 <0 50 -050 <0 50 <0 50 - 98 114 7!2212003 P 6498 31 36 037 590 <0 50 <O 50 <0 50 <0 50 - 85 1011 212003 P 6791 3429 293 <50(b) <0 50(b) <0 50(b) <0$0(b) <0 50(b) - 6 4(b) 083 116/2004 P 6682 3320 109 <50 -050 <0 50 <O 50 <0 50 - 11 - DMW 3 7f1612002 P 3271 6279 3008 - <50 <0 50 1 4 <0 50 1 3 73 53 - 1 D212002 P 6534 32 63 255 <50 <0 50 <0 50 <0 50 <0 50 <2 5 74 0 D4 111712003 P 64 15 3144 119 110 0 0 <1 0 <1 0 <1 0 130 170 1 32 414/2003 P 6368 3097 047 <500 <5 0 <5 0 <5 0 -50 - 84 1 26 7/2212003 P 6527 3256 1 59 <250 <2$ <2 5 <2 5 <2 5 - 78 - 1011 212003 P 6690 3419 1 63 <1 200(b d) <12(b) <12 Sb) <12(b) <12(b) 861b) 024 11672004 P 6592 3321 095 120 <1 0 <1 0 <1 0 <1 0 - 89 1 WRCO105951Tables%SCWT9b10 3 Groundwater Monitonng Data and Analyilcal Results xis 411612004