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<br /> Groundwater Monitoring Data
<br /> ARCO Service Station No. 2168, 441 Charter Way, Stockton, California
<br /> Well Elevation Static Elevation Top
<br /> S,11111AL 4111op Wall of ill Iolal
<br /> Number Date of Casing Level Groundwater Screen TPHG Benzene Toluene Eth (benzene Xylenes MTBE Observations
<br /> MW-1
<br /> W-40-MW-1 05/11/92 1045 4027 -2982 360 60,000 5,900 1,600 430 800 NA No FP,No S,Yes 0
<br /> MW-1(54) 08/24/92 1045 4206 -3161 14,000 4,100 330 310 490 NA No FP,No S,Yes O
<br /> MW-1(54) 12/17/92 1045 4279 -3234 14,000 3,500 410 400 800 NA No FP,No S,Yes 0
<br /> MW-1(54) 03/10/93 1045 4042 -2997 28,000 6,500 340 580 1,700 NA No FP,No S,Yes O
<br /> MW-1(54) 06/10/93 1045 3858 -28 13 23,000 5,600 640 470 1,400 NA No FP,No S,Yes 0
<br /> MW-1(54) 09/02/93 1045 3950 -29 05 27,000 7,500 700 620 2,300 NA No FP,No S,Yes 0
<br /> MW-1(54) 10/28/93 1045 3973 -2928 31,000 8,900 1,200 830 2,300 NA No FP,No S,Yes 0
<br /> MW-1(39) 03/23/93 1045 39 23 -2978 34,000 8,300 630 740 2,400 NA No FP,No S,Yes 0
<br /> MW-1(39) 06/29/94 1045 3902 -2857 36,000 11,000 11,500 840 3,300 NA No FP,No S,O=NE
<br /> MW-1(41) 09/26/94 1045 4025 -2980 34,000 6,000 490 550 1,400 NA No FP,No S,O=NE
<br /> MW-1(41) 12/01/94 1045 4041 -2996 60,000 7,190 1,000 290 710 NA No FP,No S,O=NE
<br /> MW-1(54) 02/16/95 1045 37 11 -2666 36,000 11,000 460 990 3,200 NA No FP,No S,O=NE
<br /> MW-1(53) 05/17/95 1045 3261 -22 16 38,000 12,000 790 1,100 3,400 NA No FP,No S,O=NE
<br /> MW-I(54) 08/15/95 1045 32 13 -2168 45,000 10,000 330 1,000 3,300 NA No FP,No S,Yes O
<br /> MW-1(54) 11/29/95 1045 3232 -2187 46,000 9,800 370 1,100 2,900 NA No FP,No S,Yes 0
<br /> MW-1 02/27/96 Well Inaccessible
<br /> MW-1(53) 05/15/96 1045 2788 -17 43 34,000 9,400 670 1,000 2,100 <25* No FP,No S,Yes 0
<br /> MW-1(53) 08/22/96 1045 2950 -1805 35,000 9,100 1,000 1,000 2,000 <500* No FP,No S,Yes 0
<br /> MW-1 11/25/96 1045 2871 -1826 37,000 7,900 460 870 1,500 <500* No FP,No S,Yes 0
<br /> MW-2
<br /> W40-MW-2 05/11/92 1083 4063 -29 80 360 14,000 2,100 160 <50 1,100 NA No FP,No S,Yes 0
<br /> MW-2(53) 08/24/92 1083 4244 -3161 12,000 2,400 1,100 110 600 NA No FP,No S,Yes 0
<br /> MW-2(53) 12/17/92 1083 43 18 -3235 13,000 2,500 1,500 190 880 NA No FP,No S,Yes 0
<br /> MW-2(53) 03/10/93 1083 4077 -2994 16,000 3,300 1,500 210 100 NA No FP,No S,Yes 0
<br /> MW-2(53) 06/10/93 1083 3894 -28 11 19,000 3,100 1,800 280 1,100 NA No FP,No S,Yes 0
<br /> MW-2(53) 0°1/112x)3 1083 3986 -2901 18 000 3 300 I,900 260 1,200 NA No FP, No S, Yes n
<br /> MW-2(53) 10/28/93 1083 4009 -2926 17,000 3,600 2,300 320 1,500 NA
<br /> MW-2(39) 03/23/93 1083 3961 -2878 29,000 4,100 2,800 410 1,600 NA No FP,No S,Yes O
<br /> MW-2(39) 06/29/94 1083 39 40 -2857 23,000 4,400 2,600 330 1,500 NA No FP,S=NE,O=NE
<br /> MW-2(41) 09/26/94 1083 4064 -2981 22,000 2,300 1,200 <0 5 850 NA No FP,S=NE,O=NE
<br /> MW-2 12/01/94 10 83 4083 -3000 31,000 4,300 3,700 460 2,100 NA No FP,S=NE,O=NE
<br /> MW-2(53) 02/16/95 1083 37 48 -2665 36,000 6,300 4,600 610 2,700 NA No FP,No S,O=NE
<br /> MW-2 05/17/95 Well Inaccessible
<br /> N\XLS\0805U4607\012097R1 XLS Revision 1120/97
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