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TA. 1
<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 Ethylbenzene Xylenes MTBE [11 Observations
<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 O
<br /> MW-7 05/19/97 8 88 2277 -13 89 19,000 970 2,800 390 1,700 <300* No FP,No S, Yes O
<br /> MW-7(47) 08/21/97 888 2389 -1501 19,000 1,100 2,600 490 2,000 <500** No FP,No S, Yes 0
<br /> MW-7(48) 11/17/97 888 24 91 -1603 2,300 120 190 20 100 <50 No FP,No S,No 0
<br /> MW-7(47) 02/09/98 8 88 2221 -13 33 21,000 1,100 2,800 660 2,700 4,400 No FP,No S,Yes 0
<br /> MW-7(47) 05122198 888 1836 -948 9,580 593 919 282 942 <125 No FP,No S,Yes 0
<br /> A =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
<br /> *=Raised method reporting limit due to matrix interference
<br /> [11=MTBE was analyzed using USEPA Method 8020
<br /> Sample designations
<br /> MW-4(34)-Well ID and sample depth(feet)
<br /> W-24-MW3R-Water sample,sample depth(feet),R-Rmsate blank.
<br /> 1
<br /> N MSIQMR1080n1461 lW80598K2 XLS
<br /> Sheen
<br /> 8!11198
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