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<br /> Groundwater Monitoring Data
<br /> 1995 to Present Page 5 of 5
<br /> Former ARCO Service Station No. 2168, 441 Charter Way, Stockton, California
<br /> Well Elevation Static Elevation Top
<br /> Sample of Top Water of of Total
<br /> Number Date of Casing Level Groundwater Screen TPHG Benzene Toluene Db lbenzene Xylenes MTBE 1 Observations
<br /> MW-7
<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 0
<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) 05/15/96 889 2613 -1725 38,000 2,500 7,300 790 4,100 <500* 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* No FP,No S, Yes O
<br /> MW-7 11/25/96 888 2687 -1799 52,000 3,500 9,100 810 4,700 <600** 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** No FP, No S, Yes 0
<br /> MW-7 05/19/97 888 2277 -1389 19,000 970 2,800 390 1,700 <300* No FP, No S, Yes 0
<br /> MW-7(47) 08/21/97 888 2389 -1501 19,000 11100 2,600 490 2,000 <500** No FP, No S, Yes 0
<br /> MW-7(48) 11./17/97 888 2491 -1603 2,300 120 190 20 100 <50 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 4,400 No FP, No S,Yes 0
<br /> MW-7(47) 05/22/98 888 1836 -948 9,580 593 919 282 942 <125 No FP, No S,Yes 0
<br /> MW-7(47) 08/12/98 888 1857 -969 5,690 289 460 197 628 <100 No FP, No S,Yes 0
<br /> NA =Not applicable NS=Not sampled NE=Not evaluated O=Odor S=Sheen FP=Free product
<br /> Analytical results to parts per billion
<br /> Measurements in feet
<br /> HG=Total petroleum hydrocarbons as gasoline
<br /> Elevation datum is mean sea level
<br /> <=Below detection limit for analytical methods used
<br /> *=Raised method reporting limit due to high analyte concentration requiring sample dilution Samole designations
<br /> **=Raised method reporting limit due to matrix interference MW 4(34)-Well ID and sample depth(feet)
<br /> [1]=MTBE was analyzed using USEPA Method 8020 W 24 MW3R Water sample,sample depth(feet),R=Rinsate blank
<br /> CM IQMRI3RDQTRARC012168Q398 XLS puma&
<br /> sheetl
<br /> 11/19/98
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