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<br /> Table 1 •
<br /> Groundwater Monitoring Data
<br /> ARCO Service Station No. 2186 Pagel of
<br /> 3212 North California Street
<br /> Stockton, California
<br /> Well Elevation of Static Water[1] Top of Elevation of Groundwater
<br /> Total
<br /> Sample No. Date Top of Casing Level Screen [21 Groundwater Flow Direction TPHG Benzene Toluene Eth lbenzene X lenes MTBE 3 Observations
<br /> MW-1 09/25/95 14.65 58-05 45.60 -43.40 SE 20,000 780 2,000 690;y' 4,100 No FP,No S
<br /> MW-1 10/23/95 14.65 57.89 -43.24 --- 20,000 590 1,100 600 3,600 No FP,No S
<br /> MW-1 12/22/95 14.65 53.78 -39.13 E 730 3.5 <1 [2] 13 13 No FP,No S
<br /> MW-1 02/16/96 14.65 50-13- -35.48 E 1,200 22 <1 [2] 51 24 No FP,No S
<br /> MW-1 05/23/96 14.65 45.35 -30.70 E 760 9 1 22 S.
<br /> MW-1 09/19/96 14.65 <5 Na FP,No S
<br /> 53.63 -3898 NE 10,000 480 570 520 700 <50* No FP,No S
<br /> MW-1 11/27/96 14.65 50.77 -36.12 SE 19,000 700 1,800 820 2,200 <1Q0* No FP,No S
<br /> MW-1 03/21/97 14.65 42.06 -27.41 SE 5,300 260 210 200 440 <30* No FP,No S
<br /> MW-1 05/22/97 14.65 43.89 -29.24 E-NE 25,000 920 1,900 1,400',i 3,500 <120* No FP,No S
<br /> MW-1 08/20/97 14.65 49.83 -35.18 E-NE 31,000 1,000 2,800 1,300 4,000 <500** No FP,No S
<br /> MW-1 11/20/97 14.65 49.07 -34.42 E 24,000 830 1,900 1,100 3,600 <1,000** No FP,No S
<br /> MW-1 02/17/98 14.65 44.32 -29.67 E-SE 19,000 680 990 980 3,200 <100** No FP,No S
<br /> MW-1 06/24/98 14.65 .35.79 -21.14 E 505 27.5 <2.5 6.02 ' 9.73 <25 No FP,No S
<br /> MW-1 09/21/98 14.65 39.35 -24.70 E-NE 18,900 792 1,410 1,130 3,690 <125 No FP, No S
<br /> Mho'-1 12/14198 14.65. 37.34 -22.69 E-NE 13,800 613 449 896 2,800 <100 No FP,No S
<br /> MAV-1(Discreet) 12/14/98 14.65 37.34 -22.69 E-NE 7,370 424 16.1 527 848 <100 No FP,No S
<br /> MW-1 03/31/99 14.65 34.14 -19.49 N-NE 81.7 4.32 <0.5 <0.5 <0.5 <5 No FP,No S
<br /> MW-1 06/11/99 14.65 34.22 -19.57 E-NE 7,310 397 162 543 1,500 <50 No 1'P No S
<br /> M1y-1 09/10/99 14.65 38.41 -23.76 E-NE 22,800 941 1,180 1,410 4,450 2,590 No FP,No S
<br /> MW-1 12/03/99 14.65 38.34 -23.69 E 15,400 552 155 907 2,680 517 No FP,No S
<br /> MW-2 09/25/95 15.49 59.01 55.50 -43.52 SE <50, <0.5 <0.5 <0.5 2.0 No FP,No S
<br /> MW-2 10/23/95 15.49 NM NM --- NA NA NA NA s
<br /> MW-2 12/22/95 15.49 54.76 NA NM
<br /> -39.27 E <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> MW-2 02/16/96 15.49 51.16 -35.67 E <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> MW-2 05123I96 15.49 46.25 -30.79 E <50 <0.5 <0.5 <0.5 <0.5 No FP,No S
<br /> MW-2 09/19/96 15.49 54.53 -39.04 NE <50 <0.5 <0.5 <0.5 <0.5 <3 No FP,No S
<br /> MW-2 11/27/96 15.49 51.67 -36.18 SE <50 <0.5 <0.5 <0.5 <Q.5 <3 NoLFPP, o sMW-2 03/21/97 15.49 43.16 -27.67 SE <5Q <0.5 <0.5 <0.5 <0.5 <3 Noo.S
<br /> CPIC:IARCHNE�ARCO\2186\QTRLY\2186y499.xts 1T Corporation
<br /> 02/22/2000
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