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SUMMARY OF GROUND-WATER MONITORING DATA <br /> Fourth Quarter 1992 <br /> ARCO Service Station 2133 <br /> 2906 Benjamin Holt Drive,Stockton <br /> (micrograms per liter(ug/1) or parts per billion(ppb), unless noted <br /> Floating <br /> Well ID Depth to Product Total TPH as <br /> and Sample Sampling Water Thickness Benzene Toluene Ethylbenzene Xylenes Gasoline <br /> Depth Date feet feet b b b b b <br /> PR-1 (27) 10/29/92 1884 ND ND ND ND ND ND <br /> PR-2(27) 10/29/92 1831 ND ND ND ND ND ND <br /> BHD-1 (27) 10/29/92 1835 ND 80 <2 5" 110 17 1,800 <br /> BHD-2(28) 10/29/92 1872 ND ND ND ND ND ND <br /> E-2(22) 10/29/92 2052 ND 12 ND 25 14 540 <br /> E-3 10/29/92 dry ND NS NS NS NS NS <br /> E-4 (21) 10/29/92 1999 ND 1,300 16 130 180 5,600 <br /> E-5 10/29/92 dry ND NS NS NS NS NS <br /> E-6 10/29/92 dry ND NS NS NS NS NS <br /> E-7' 10/29/92 1886 ND NS NS NS NS NS <br /> E-8(23) 10/29/92 1862 ND 87 <07... 71 67 620 <br /> E-9 (18) 10/29/92 1719 ND 480 32 440 1,100 8,900 <br /> E-10(22) 10/29/92 1899 ND 3,600 700 1,200 4,000 25,000 <br /> E-11 (23) 10/29/92 2100 ND 390 C20" 68 150 6,600 <br /> E-12(22) 10/29/92 1955 ND 67 ND 1 3 27 400 <br /> TPH=Total petroleum hydrocarbons <br /> ND= Not detected <br /> `=Not sampled due to an insufficient amount of water in the well <br /> *`=Raised MRL due to high analyte concentration requiring sample dilution <br /> NS=No Sample Insufficient water to collect a sample <br /> "'=Raised MRL due to matrix interference <br /> OG71-019 01 <br />