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Page 1 of 3 Table 2 Groundwater Elevation and Analytical Data Former ARCO Service Station#4932 16 E Harding Way Stockton CA Well Depth Groundwater SPH Groundwater Ethyl- Xylenes MtBE Well Date Elevation to Water Elevation Thickness Elevation TPHg Benzene Toluene benzene (total) (802018260) DO Number Sampled (I1,MSL) (It TOC) (ft,MSL) (ft) Change(ft) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (mg&) MW-1 915/00 P 1241 2713 -14 72 000 - 1 470 128 73 2 512 254 26B - 1112100 P 2776 -1535 000 063 1 040 138 680 188 101 3861280 3 0 3/5101 P 2713 -1472 000 0 63 834 125 550 205 127 3791376 3 9 518101 P 26 75 1434 000 0 38 600 781 247 172 85 4 954/1,000 0 57 7120101 P 2811 1570 000 -1 36 <500 <5 0 <5 0 <5 0 <5 0 750/990 - 10/22/01 P 2996 1755 000 1 85 650 50 21 16 120 1700/1 600 1 01 01/15/02 P 2943 1702 000 0 53 2 700 170 32 110 600 1 20011 100 1 60 04/11/02 P 2865 -1624 000 078 1,300 130 5 4 68 200 8501510 3 0 07/12/02 P 2961 -1720 000 -096 9,300 290 30 290 1,200 5,100/4,700 2 4 MW-2 9/5100 P 1311 2760 1449 0 00 - 1,330 394 1 94 343 104 1 420' - 11/2100 P 2829 1518 0 00 -069 10,700 169 <25 0 1,930 230 4,02013,900 2 6 315101 P 2764 1453 000 065 7,750 106 176 1 580 579 12,00012,860 3 6 5/8/01 P 2726 -1415 000 038 8 750 116 154 1 900 923 307012 660 0 71 7120101 P 2856 -1545 000 1 30 <5 000 <50 <50 870 <50 1,90011 900 - 10/22l01 P 3045 -17 34 000 1 89 1 500 11 8 9 170 10 1 70011 600 034 01/15/02 P 29 90 1679 000 0 55 2 100 18 <50 350 34 1,40011 200 2 2 04/11/02 P 21307 15 96 000 0 83 1 700 24 <5 0 270 13 1 000/590 3 3 07/12/02 P 3005 -16 94 000 -0 98 1,200 10 <10 150 <10 1,000!720 25 MW 3 9/5100 P 11 70 2713 1543 000 499 294 <0 50 <0 50 155 5 62" - 11/2/00 P 2641 -1471 000 072 116 655 <0 500 <0 500 1 42 <2 50/29 1 7 315101 P 2621 -1451 000 020 799 646 <0 500 <0 500 0 653 <2 50/2 64 38 5/8/01 P 2583 -1413 000 038 <50 <0 500 <0 500 <0 500 <0 500 3 63/3 98 048 7/20/01 P 2724 -1554 000 -1 41 <50 <0 50 <0 50 <0 50 <0 50 77/22 - 10/22/01 P 2910 1740 000 -186 250 9 5 <0 50 <0 50 <0 50 29/<2 0 098 01/15/02 P 2852 1682 000 058 1600 74 11 <5 0 76 180/1 0 40 04/11/02 P 2765 1595 000 087 <50 2 2 <0 50 <0 50 <0 50 4 712 0 35 07M 2/02 P 2872 -1702 000 -1 07 240" 87 13 072 10 14112 33 MW-4 915100 P 11 98 2663 -1465 000 166,000 10,500 43 600 5,230 25,400 708,000 - 1112100 P 2732 -1534 000 -069 180 000 9 400 42 600 5 260 26 900 376 000/350 000 33 315101 P 2663 -1465 000 069 165,000 10 700 45 300 5 020 26 500 596,0001466,000 42 518/01 P 2626 1428 000 037 149,000 9 660 45 300 5 280 26 800 372 0001500,000 044 7120101 P 2741 1541 1 002 1 13 Not sampled 0 02 It LPH present 10/22/01 2992 1759 ' 046 218 Not sampled 0 461t LPH present 01/15/02 P 2991 1793 000 034 140,000 7,900 39 000 6 000 29,000 77 000190 000 22 04/11/02 P 2710 1512 000 281 140 000 9 700 33,000 8 100 37 000 180 0001160 000 - 07/12/02 P 2921 -1723 000 -211 210,000 7,100 31,000 10,000 41,000 190,0001150,000 26 Project/ARCO/4932/Reports/Tables/gwtables4932 As