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<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Elevatton
<br /> Top of Static Water Water Depth to Ethyl- Total Dissolved
<br /> Well ID Casing(feet Level Elevation Screen TPHO Benzene Toluene benzene Xylenes MtBE Oxygen
<br /> &Sample Date msl) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (ppm)
<br /> MW-6 47 5/15/1996 25 79 1686 99 000 8 800 12,000 1,400 8,000 <900**[1] NA
<br /> (corn) 8/22/1996 2648 -175S 98 000 8,200 7,300 1600 9,000 <1 000**{1j NA
<br /> 11/25/1996 2661 -1768 84,000 9 300 9,500 1,500 8 800 <900**[I] NA
<br /> 2024/1997 2277 13 84 140,000 9,700 11,000 1,400 8,500 <z,000**[1] NA
<br /> 5/19/1997 2253 1360 69,000 7,900 5 000 1,200 7 700 <600*[I] NA
<br /> 45 8021/1997 23 65 -1472 86,000 7,400 4,000 1,300 7 400 <1000**[1] NA
<br /> 41 11/17/1997 2470 -1577 42 000 5,400 2100 1,100 6,600 <67 NA
<br /> 43 2/9/1998 2201 13 08 62 000 12 000 7 000 1300 7,400 <1 000•*[l] NA
<br /> 42 5/22/1998 1914 -921 66 100 9 740 4,620 1 180 6,820 <100 NA
<br /> 42 8/12/1998 1842 -949 54,700 7 670 2,340 1,230 6,800 <200 NA
<br /> 42 11/9/1998 19 73 -1090 15 900 1,080 315 267 1,240 <2 NA
<br /> 45 2/17/1999 1879 -986 53,500 9 870 2,720 1,540 8,320 <2 NA
<br /> 45 5/25/1999 1812 -919 43,900 7,020 1,880 1,520 8,290 <2 NA
<br /> 45 8/18/1999 19 26 -1033 40,900 6,260 1,590 1,470 7,460 478 NA
<br /> 45 12117/99[2] 2008 1115 4 080 536 149 122 756 <2 NA
<br /> 45 2/22/2000 19 29 1036 38,200 8,430 1 800 1,330 6 390 <2 NA
<br /> 48 6/22/2000 18 15 9 22 2,150 <2 5 15 14 <2 NA
<br /> 8/30/2000 1912 -1019 37 900 5,290 1,260 1,280 5,570 <2 NA
<br /> 11/21/2000 1983 -1090 30 100[5] 5,120 1,080 1 150 5,150 <2 NA
<br /> 2/15/2001 1972 -1079 58,200[61 5 930 1400 1,540 5 820 <2 1 1
<br /> 5/172001 1911 -1018 31,700[5] 5,210 1 090 1,300 5,020 <40 0 9
<br /> 8/16/2001 2050 -1157 39,000 5,000 1,300 1,600 5,500 <50* 0 7
<br /> 12/6/2001 2150 1257 28 000 5,800 <100 1,300 4,800 <100* 0 6
<br /> 2/14/2002 1980 1087 32 000 4,100 1 100 1,400 4,800 <50[10] 0 8
<br /> 6/13/2002 2020 1127 34 000 3,600 1,100 1,300 4,000 <25[10] 0 9
<br /> 8!22!2002 2123 1230 27,000 5,000 950 1,100 4,500 <25 11
<br /> 1 VI3/2002 2223 1330 37,000 5,000 900 1,400 4,600 <100 --
<br /> MW 7 2/16/1995 Well Inaccesstble
<br /> 5/17/1995 8 88 3050 -2162 300 40,000 2,300 8200 820 4,800 NA NA
<br /> 48 8/1501995 3041 2153 30,000 1400 4,400 490 2 800 NA NA
<br /> 48 11/29/1995 3056 2168 45,000 2 100 6 400 800 3,600 NA NA
<br /> 2/27/1996 2775 -1887 40,000 2,700 7,800 740 4,000 NA NA
<br /> 48 5/15/1996 2613 47 25 38,000 2,500 7,300 790 4 100 <500*[1] NA
<br /> 8/22/1996 2667 -1779 52,000 4,400 9 900 790 4,600 <500*[1] NA
<br /> 11/25/1996 2687 -1799 52 000 3,500 9 100 810 4,700 <600**[I] NA
<br /> 2/24/1997 22 89 1401 25,000 1,300 3,700 500 2200 <700**[1] NA
<br /> 5/19/1997 2277 -1389 19 000 970 2,800 390 1,700 <300*[1] NA
<br /> k U5 BP ARCQ021681Quzder17k2168(3WMR4Q02
<br /> 6of9
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