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<br /> Table 1
<br /> Groundwater Monitoring Data
<br /> 1995 to Present Page 5 of 6
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way, Stockton, California
<br /> Well ID Elevation Static Elevation Top
<br /> &Sample of Top Water of of Ethyl- Total
<br /> Depth Date of Casing Level Groundwater Screen TPHG Benzene Toluene benzene Xylenes MTBE Observations
<br /> MW-6 42 05/22/98 893 1814 -921 66,100 9,740 4,620 1,180 6,820 <100 No FP,No S,Yes 0
<br /> MW-6 42 08/12/98 893 1842 -949 54,700 7,670 2,340 1,230 6,800 <200 No FP,No S, Yes 0
<br /> MW-6 42 11/09/98 893 1973 -1080 15,900 1,080 315 267 1,240 <2 No FP,No S,Yes 0
<br /> MW-6 45 02/17/99 893 1879 -986 53,500 9,870 2,720 1,540 8,320 <2 No FP,No S,Yes 0
<br /> MW-6 45 05/25/99 893 1812 -919 43,900 7,020 1,880 1,520 8,290 <2 No FP,No S, Yes 0
<br /> MW-6 45 08/18/99 893 1926 -1033 40,900 6,260 1,590 1,470 7,460 478 No FP,No S,Yes 0
<br /> MW-6 45 12/17/99[2] 893 2008 -1115 4,080 536 149 122 756 <2 No FP,No S,O=NE
<br /> MW-6 45 02/22/00 893 1929 -1036 38,200 8,430 1,800 1,330 6,390 <2 No FP,No S, Yes 0
<br /> MW-7 02/16/95 Well Inaccessible
<br /> MW-7 05/17/95 888 3050 -2162 300 40,000 2,300 8,200 820 4,800 NA No FP,No S,O=NE
<br /> MW-7 48 08/15/95 888 3041 -2153 30,000 1,400 4,400 490 2,800 NA No FP, No S, Yes O
<br /> MW-7 48 11/29/95 888 3056 -2168 45,000 2,100 6,400 800 3,600 NA No FP,No S, Yes 0
<br /> MW-7 02/27/96 888 2775 -1887 40,000 2,700 7,800 740 4,000 NA No FP,No S,Yes 0
<br /> MW-7 48 05/15/96 888 2613 -1725 38,000 2,500 7,300 790 4,100 <500*[11 No FP,No S,Yes 0
<br /> MW-7 08/22/96 888 2667 -1779 52,000 4,400 9,900 790 4,600 <500*[1] No FP,No S,Yes 0
<br /> MW-7 11/25/96 888 2687 -1799 52,000 3,500 9,100 810 4,700 <600**[1] No FP,No S,Yes 0
<br /> MW-7 02/24/97 888 2289 -1401 25,000 1,300 3,700 500 2,200 <700**[1] No FP,No S,Yes 0
<br /> MW-7 05/19/97 888 2277 -13 89 19,000 970 2,800 390 1,700 <300*[I] No FP, No S,Yes 0
<br /> MW-7 47 08/21/97 888 2389 -1501 19,000 1,100 2,600 490 2,000 <500**[1] No FP,No S,Yes 0
<br /> MW-7 48 11/17/97 888 2491 -1603 2,300 120 190 20 100 <50[l] No FP,No S,No 0
<br /> MW-7 47 02/09/98 888 2221 -1333 21,000 1,100 2,800 660 2,700 4400[1] No FP,No S,Yes 0
<br /> MW-7 47 05/22/98 888 1836 -948 9,580 593 919 282 942 <100 No FP,No S,Yes 0
<br /> MW-7 47 08/12/98 888 1857 -969 5,690 289 460 197 628 <2 No FP,No S,Yes 0
<br /> MW-7 47 11/09/98 888 1968 -1080 4,970 406 612 119 520 <2 No FP,No S,Yes 0
<br /> MW-7 47 02/17/99 888 1890 -1002 42,300 3,650 8,230 942 5,030 <2 No FP, No S,Yes 0
<br /> MW-7 35 05/25/99 888 1831 -943 9,910 944 1,910 287 1,550 <2 No FP,No S,Yes 0
<br /> MW-7 47 08/18/99 888 1938 -1050 10,400 681 1,040 331 1,500 <2 No FP, No S,Yes O
<br /> MW-7 47 12/17/99[2} 888 2030 -1142 1,790 833 269 966 808 <2 No FP,No S, O=NE
<br /> MW-7 47 02/22/00 888 1936 -1048 2,240 159 98 149 399 <2 No FP,No S, Yes 0
<br /> I
<br /> IT Corporation
<br /> CP1DatalArchevelARC0121681QTRLY12168g100 xis 04/19/2000
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