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s TAR 1
<br /> HISTORICAL GROUNDWATER MONITORING DATA
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Elevation
<br /> Top of Static Water Water Depth to Ethyl- Total Dissolved
<br /> Well ID Casing(feet Level Elevation Screen TPHG Benzene Toluene benzene Xylenes MtBE Oxygen
<br /> &Sample Date nW) (feet bgs) (feet msl) (feet bgs) ug/L ug/L ug/L ug/L ug/L ug/L (ppm)
<br /> MW-5 2112/2003 22.76 -1348 76 41 <0 5 14 17 <05 31
<br /> (cold)
<br /> MW-6 47 2/16/1995 893 3706 -28 13 300 39 000 6 400 5,200 850 4 400 NA NA
<br /> 46 5/17/1995 3064 2171 130,000 9,900 16,000 1,800 10,000 NA NA
<br /> 46 8/15/1995 3022 -2129 120,000 7,700 9,700 1,500 8,900 NA NA
<br /> 45 11/29/1995 3030 2137 160,000 8,200 11,000 1,700 10 000 NA NA
<br /> 2/27/1996 2755 1862 96,000 10,000 13,000 1,400 8,100 NA NA
<br /> 47 5/15/1996 25 79 -1686 99,000 8 800 12,000 1,400 8,000 <900**[1] NA
<br /> 8/22/1996 2648 -1755 98 000 8,200 7,300 1,600 9,000 <1 000**[1] NA
<br /> 11125/1996 2661 1768 84,000 9 300 9 500 1 500 8 800 <900**[1] NA
<br /> 2/24/1997 2277 1384 140 000 9,700 11,000 1,400 8 500 <2 oFlo**[t] NA
<br /> 5/19/1997 2253 1360 69 000 7 900 5,000 1,200 7,700 <600*[1] NA
<br /> 45 8/21/1997 2365 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 2 100 1,100 6 600 <67 NA
<br /> 43 2/9/1998 2201 -1308 62 000 12,000 7,000 1,300 7,400 <1000**[1] NA
<br /> 42 5/22/1998 1814 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 1080 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 G2 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 1926 -1033 40,900 6,260 1,590 1,470 7,460 478 NA
<br /> 45 12/1719912] 2008 1115 4,080 536 149 122 756 <2 NA
<br /> 45 2/22/2000 1929 -1036 38 200 8,430 1,800 1,330 6,390 <2 NA
<br /> 48 6122/2000 18 15 -922 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 /> 11121/2000 1983 -1090 30,100(5) 5,120 1080 1,150 5,150 <2 NA
<br /> 2/15/2001 1972 -1079 58 200[6] 5 930 1 400 1,540 5,820 <2 1 1
<br /> 5/17/2001 19 11 -10 18 31 700[5] 5 210 1,090 1,300 5,020 <40 09
<br /> 8/16/2001 2050 -1157 39,000 5,000 1,300 1,600 5 500 <50* 07
<br /> I2/6/2001 2150 -1257 28,000 5,800 <100 1 300 4 800 <100* 06
<br /> 2/14/2002 1980 -1087 32,000 4,100 1,100 1,400 4 800 <50[10] 09
<br /> 6/13/2002 2020 -1127 34,000 3,600 1,100 1,300 4,000 <25110] 09
<br /> 8/22/2002 2123 1230 27 000 5,000 950 1,100 4,500 <25 11
<br /> 11/13/2002 2223 13 30 37 000 5 000 900 1,400 4 600 <100 --
<br /> 21IV2003 2148 -1355 31,000 4,200 900 1,200 5,700 <50 10
<br /> MW 7 2/16/1995 Well Inaccessible
<br /> 5/17/1995 8 88 3050 -2162 300 40,000 2,300 8,200 820 4,800 NA NA
<br /> K U5 BP ARC01021681QuartertykI QTR 0312168 GWMR 1 Q03
<br /> 6of9
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