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<br /> TABLE 1
<br /> Groundwater Monitoring Data
<br /> ARCO Service Station No 2186
<br /> 3212 North California Street, Stockton,California
<br /> Elevation of Static Water[l] Screen Elevation of Total
<br /> Well Top of Casing Level Interval Groundwater Groundwater TPHG Benzene Toluene Ethylbenzene Xylenes MTBE[3]
<br /> Sample No Date feet msl feet b s feet b s feet msl Flow Direction L L Observations
<br /> mW-1 9/25/95 1465 5805 456747 -4340 SE 20,000 780 2,000 690 4,100 NA No FP,No S
<br /> 10/23/95 1465 5789 -4324 20,000 590 1,100 600 3,600 NA No FP,No S
<br /> 12/22/95 1465 53 78 -39 13 E 730 3 5 <t 0[2] 13 13 NA No FP,No S
<br /> 2/16/96 1465 50 13 -35 48 E 1,200 22 <l 0[2] 51 24 NA No FP,No S
<br /> 5/23/96 1465 45 35 3070 E 760 90 10 22 5 0 <5 0 No FP,No S
<br /> 9/19/96 1465 53 63 -3898 NE 10,000 480 570 520 700 <50* No FP,No S
<br /> 1/27/96 1465 5077 -36 12 SE 19,000 700 1,800 820 2,200 <100* No FP,No S
<br /> 3121197 1465 4206 2741 SE 5,300 260 210 200 440 <30* No FP,No S
<br /> 5122/97 1465 4389 -2924 E-NE 25,000 920 1,900 1,400 3,500 <120* No FP,No S
<br /> 8/20197 1465 4983 35 18 E NE 31,000 1,000 2,800 1,300 4,000 <500** No FP,No S
<br /> 11/20/97 1465 4907 -3442 E 24,000 830 1,900 1,100 3,600 <1,000** No FP,No S
<br /> 2117/98 1465 4432 -2967 E-SE 19,000 660 990 980 3,200 <100** No FP,No S
<br /> 6/24/98 1465 1579 -21 14 E 505 275 <2 5 602 973 <25 No FP,No S
<br /> 9/21/98 1465 3935 -2470 E-NE 18,900 792 1,410 1,130 3,690 <125 No FP,No S
<br /> 12/14/98 1465 3734 -2269 ENE 13,800 613 449 896 2,800 <100 No FP,No S
<br /> MW-I (Discreet) 12/14/98 1465 3734 2269 ENE 7,170 424 16 1 527 848 <100 No FP,No S
<br /> 3/31199 1465 34 14 1 -1949 N-NE 81 7 432 <0 5 <0 5 <0 5 <5 0 No FP,No S
<br /> 6/1 1/99 1465 3422 1957 ENE 7,310 397 162 543 1,500 <50 No FP,No S
<br /> 9/10/99 1465 3841 -2376 E NE 22,800 941 1,180 1,410 4,450 2,590 No FP,No S
<br /> 12/3/99 1465 3834 -2369 E 15,400 552 155 907 2,680 517 No FP,No S
<br /> 4/3/00 1465 3500 -2035 NE 6,940 534 <20 518 1,260 334 No FP,No S
<br /> 6122/00 1465 35 13 -2048 E 14,700 675 144 744 2,500 114[4] No FP,No S
<br /> 9/27/130 1465 4046 -2581 ENE 1,190 531 202 843 2,140 4,500[4] No FP,No S
<br /> 10/19/00 1465 4025 -2560 E-NE NA NA NA NA NA NA
<br /> 12/20/00 1465 38 33 2368 ENE 14,600[5] 704 111 741 2,870 2,000 No FP,No S
<br /> 3/16/01 1465 3725 -2260 E NE 16,800[5] 1,210 802 848 4,230 2,190[4] No FP,No S
<br /> 6/21/01 1465 4002 2537 NE 24,000[5] 1,000 380 980 4,100 28,000[4] No FP,No S
<br /> 9113/01 1465 4582 31 17 ENE 38,000 2,200 2,200 2,100 8,800 4,500[4] No FP,No S
<br /> ARCO 2186 Quarterly Data XLS 'I of 6
<br /> Delta
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