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Groundwater Monitoring and Analytical Data
<br /> Former ARCO Service Station No.2168
<br /> 441 Charter Way
<br /> Stockton,California
<br /> Elevation
<br /> Top of Static Water Groundwater Depth to Ethyl- Total Dissolved
<br /> Well ID Casing(feet Level Elevation Screen TPHG 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 (mg/L)
<br /> MW-I 54 2/16/1995 10.45 37.11 -26.66 35.5 36,000 11,000 460 990 3,200 NA NA
<br /> 53 5/17/1995 32.61 -22.16 38,000 12,000 790 1,100 3,400 NA NA
<br /> 54 8/15/1995 32.13 -21.68 45,000 10,000 330 1,000 3,300 NA NA
<br /> 54 11/29/1995 32.32 -21.87 46,000 9,800 370 1,100 2,900 NA NA
<br /> 2/27/1996 Well Inaccessible
<br /> 53 5/15/1996 27.88 -17.43 34,000 9,400 670 1,000 2,100 <25*[1] NA
<br /> 53 8/22/1996 28.50 -18.05 35,000 9,100 1,000 1,000 2,000 <500*[1] NA
<br /> 11/25/1996 28.71 -18.26 37,000 7,900 460 870 1,500 <500*[1] NA
<br /> 2/24/1997 24.66 -14.21 37,000 8,300 740 900 2,200 <500*[1] NA
<br /> 5/19/1997 24.54 -14.09 30,000 8,200 310 780 1,100 <600*[I] NA
<br /> 54 8/21/1997 25.62 -15.17 28,000 8,200 380 860 1,100 <2,000**[1] NA
<br /> 54 11/17/1997 26.67 -16.22 23,000 9,300 580 820 1,300 <1,000**[1] NA
<br /> 54 2/9/1998 24.09 -13.64 20,000 6,800 360 700 1,100 <1,000**[1] NA
<br /> 53 5/22/1998 20.08 -9.63 20,700 6,650 413 588 1,030 <100 NA
<br /> 53 8/12/1998 20.26 -9.81 22,000 8,690 510 785 1,220 <2 NA
<br /> 53 11/9/1998 21.40 -10.95 21,300 7,420 289 628 1,020 24.20 NA
<br /> 53 2/17/1999 20.60 -10.15 2,650 834 48.3 90.2 •138 23.80 NA
<br /> 53 5/25/1999 19.96 -9.51 22,600 8,410 291 854 1,160 30.80 NA
<br /> 53 8/18/1999 21.95 -11.50 19,400 7,860 228 670 958 11.60 NA
<br /> 53 12/17/99[2] 21.90 -11.45 15,900 5,630 121 379 579 34.40 NA
<br /> 53 2/22/2000 21.13 -10.68 19,700 8,830 228 800 932 19.30 NA
<br /> 54 6/22/2000 19.89 -9.44 19,900 6,020 139 401 486 13.20 NA
<br /> 8/30/2000 20.92 -10.47 18,300 8,600 254 654 650 2.28 NA
<br /> 11/21/2000 21.60 -11.15 6,620[4] 1,570 70.3 90.8 199 12.8 NA
<br /> 2/15/2001 21.67 -11.22 11,300[7] 3,490 136 450 329 22.6 1.0
<br /> 5/17/2001 20.90 -10.45 8,630[5] 3,190 <50 197 137 24.3 0.7
<br /> 8/16/2001 22.27 -11.82 13,000 4,400 130 440 300 <100* 1.9
<br /> 12/6/2001 23.34 -12.89 12,000[8] 5,100 <50 340 210 <50 1.1
<br /> 2/14/2002 21.74 -11.29 13,000 5,100 110 410 250 29 1.3
<br /> 6/13/2002 22.06 -11.61 10,000 2,400 87 300 240 24.0 0.8
<br /> 8/22/2002 23.05 -12.60 13,000 5,100 160 430 330 31 1.0
<br /> 11/13/2002 24.03 -13.58 <10,000 2,200 <100 <100 <100 <100 --
<br /> 2/12/2003 -- - Not Sampled
<br /> 5/29/2003 -- - Not Sampled
<br /> MW-113 8/30/2000 10.26 21.25 -10.99 75.0 504 160 6.9 12 26.2 <2 NA
<br /> 11/21/2000 21.36 -11.10 1,500[4] 506 16.5 25.5 55.3 <2 NA
<br /> 2/15/2001 21.62 -11.36 721 [7] 233 10.2 17.5 24.2 <2 0.8
<br /> _13,39
<br /> k:V5 BP ARC0\02168\Qts erly\2168 GWMR 2Q03.x1s
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