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=4r Table 1 Groundwater Elevation and Analytical Data ARCO Service Station 94932 16 E Harding Way Stockton California Well Depth Groundwater LPH Groundwater Ethyl- Xylenes ME MtBE Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) 8020 (802018260) DO Number Sampled (ft MSL) qt TOC) (ft,MSL) (ft) Change(11) (ppb) (ppb) (ppb) (ppb) (ppb) _ (ppb) (mg10 MW 1 09/05100 P 1241 2713 1472 000 — 1 470 128 732 512 254 268 — — 11102/00 P 2776 1535 000 -063 1 040 138 680 108 101 386 280 30 03105!01 P 2713 1472 000 063 834 125 550 205 127 379 376 39 05108101 P 2675 1434 0 DO D38 600 781 247 172 854 954 1000 057 07/20/01 P 28 11 1570 0 DO 1 36 5500 550 <5 0 <50 <5 0 750 990 — 10/22/01 P 2996 1755 0 DO 1 85 650 50 21 16 120 1700 1600 101 01115102 P 2943 1702 000 053 2 700 170 32 110 600 1200 1100 160 04111/02 P 2865 1624 000 078 1 30D 130 54 fib 200 850 510 30 D7112102 P 2961 1720 000 -096 9 300 29D 30 290 1200 5 100 4700 24 11/20/02 P 3210 1969 000 249 1 60D 31 <5 0 91 12 1 400 1600 002 01/30/03 — — — — -- Well unable to be sampled located In construction area 04!28103 — — — — — Well unable to be sampled connected to remedial system 07129tO3' P 3174 1933 000 -- 16 000 s 430 1200 540 1 800 — 2200 — 1 ON 7103 P 3298 2057 000 124 1 100 <5 0 <5 0 <50 <5 0 — 2900 — 01/12/04 P 3302 2061 000 -004 220 <5 0 <5 0 -50 -50 — 430 220 04126704 P 3126 1885 000 1 76 570 <5 0 <50 -50 <5 0 — 850 — 07/14/04 P 3264 2023 000 138 <5 000 <50 <50 <50 <50 — 4200 — I M7/04 P 3460 2219 000 196 <2 500 <25 525 525 <25 — 1 700 — 01713705 P 3503 2262 000 -043 950 <50 <50 <50 <50 — 1 700 — 04/15/05 P 3084 1843 coo 419 2 600 <25 <26 <25 <25 — 1 800 64 MW 2 09105!00 P 1311 2760 1440 000 — 1 330 394 1 94 343 104 1420 — -- 11/02100 P 2629 1518 000 -069 10 7D0 169 <25 0 1 930 230 4020 3 9D0 26 037)5/01 P 2764 1453 000 065 7 750 106 176 1 580 579 12000 2 860 36 05!08/01 P 2726 1415 coo 038 8 750 116 154 1 900 923 3070 2 660 071 0720101 P 2856 1545 0 OD 1 30 <5 000 <50 <50 870 550 19W 1 900 — 1022101 P 3045 1734 D OO -189 1 500 11 89 170 10 1700 1 6D0 034 01/15/02 P 2990 1679 D 00 055 2 100 1a -50 350 34 1400 1 200 22 04/11/02 P 2907 1596 0 OO 083 1 700 24 <50 270 13 1000 590 33 07/12/02 P 30 DS 1694 D DO -098 1200 10 510 150 <10 1000 720 25 1120/02 P 3254 1943 0 OD 249 1 000 91 29 27 <2 5 920 1 OOD 020 01/30!03 -- -- — — — Well unable to be sampled located in construction area 0428/03 — — — — — Well unable to be sampled connected to remedial system 07/29/03 P 31 98 1887 0 OD — 990 ° 96 -50 60 51 — 560 — 10/17/03 P 3315 2004 0 OD 1 17 760 <2 5 20 10 51 — 850 — 01/12104 P 3316 2005 0 DO -001 290 <5 0 <50 <50 <50 — 430 230 0426/04 P 31 62 1051 000 154 220 <0 50 <0 50 081 59 — 220 — 07/14/04 P 32 87 1976 000 1 25 5500 -50 <50 <50 <50 — 300 — 10/27(04 P 3402 21 71 0 DO 1 95 <1 000 <10 <10 <10 510 — 400 — 01/13/05 P 3423 21 12 000 059 370 510 <10 <10 <10 — 460 — 04/13105 P 3183 1872 000 240 57 <0 50 <0 60 <0 50 <0 50 — 44 24 MW 3 D9/05/00 P 11 70 27 13 1543 000 -- 499 294 <D 50 <0 50 155 562 562 — 11/02/00 P 2641 1471 000 072 116 655 <O 500 <0 500 142 <2 5 29 1 7 03/05/01 P 2621 1451 000 020 799 646 <0 500 <0 500 0 653 <2 5 264 38 05/OS/01 P 2583 1413 000 038 <50 <0 500 <0 500 <0 500 <D 5DD 363 398 048 0720/01 P 2724 1554 000 141 <50 <0 50 -050 50 50 -050 77 22 — 1022101 P 2910 17 46 0 DO 1 86 250 95 <0 SO <0 50 <0 50 29 <2 D 098 01115/02 P 2852 16 82 000 058 1600 74 11 <50 76 160 10 40 04111102 P 2765 1595 0 DO 087 <50 22 <0 50 <O 50 <0 50 47 20 35 07/12/02 P 2872 1702 000 1 07 240 — 87 1 3 072 10 140 12 33 I1ProleetMARCOW932%Tables%QMR Tables12Q05 gwtab6es4932 xis Page 1 of 7