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Table 1
<br /> Groundwater Monitoring Data j
<br /> 1995 to Present Page 5 of 5
<br /> Former ARCO Service Station No 2168
<br /> 441 Charter Way, Stockton, California
<br /> Well ID Elevation Static Elevation Top
<br /> &Sample of Top Water of of Ethyl- Total
<br /> Depth Date of Casin X Level Groundwater Screen TPHG Benzene Toluene benzene lenes MTBE Observations
<br /> MW-7 02/16!95 Well Inaccessible
<br /> MW-7 05/17195 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 27 75 -1887 40,000 2,700 7,800 740 4,000 NA No FP,No S,Yes 0
<br /> MW-7 48 05/15/96 888 2613 -1725 38,000 2,500 7,300 790 4,100 <500*[1] 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*[1] No FP,No S,Yes 0
<br /> MW-7 11/25/96 888 2687 -1799 52,000 3,500 9,100 810 4,700 <600**[1] 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**[1] No FP,No S,Yes 0
<br /> MW-7 05/19/97 888 2277 -1389 19,000 970 2,800 390 1,700 <300*[1] No FP,No S,Yes 0
<br /> MW-7 47 08/21/97 888 23 89 -1501 19,000 1,100 2,600 490 2,000 <500**[1] No FP,No S,Yes 0
<br /> MW-7 48 11/17/97 888 24 91 -1603 2,300 120 190 20 100 <50111 No FP,No S,No O
<br /> MW-7 47 02/09/98 888 2221 -1333 21,000 1,100 2,800 660 2,700 4400[1] No FP,No S,Yes 0
<br /> MW-7 47 05/22/98 888 1836 -948 9,580 593 919 282 942 <100 No FP,No S,Yes 0
<br /> MW-7 47 08/12/98 8 88 1857 -9 69 5,690 289 460 197 628 <2 No FP,No S,Yes 0
<br /> MW-7 47 11/09/98 8 88 1968 -1080 4,970 406 612 119 520 <2 No FP,No S,Yes 0
<br /> MW-7 47 02/17/99 888 1890 -1002 42,300 3,650 8,230 942 5,030 <2 No FP,No S, Yes 0
<br /> MW-7 35 05/25/99 888 1831 -9 43 9,910 944 1,910 287 1,550 <2 No FP,No S,Yes O
<br /> MW-7 47 08/18/99 888 1938 -1050 10,400 681 1,040 331 1,500 <2 No FP,No S,Yes O
<br /> NA =Not appheahle NS=Not sampled NE=Not evaluated 0=Odor S=Sheen FP=Free product
<br /> Analytical results m parts per billion
<br /> Measurements in feet
<br /> PHG=Total petroleum hydrocarbons as gasoline
<br /> levation datum is mean sea level
<br /> 1<=Below detection hnvt for analytical methods used
<br /> '=Raised method reporting Emit due to high analyte concentration requiring sample dilution Sample designations
<br /> **=Raised method reporting hnvt due to matrix interference MW-4(34)-Well ID and sample depth(feet)
<br /> MTBE was analyzed using USEPA Method 8260,unless noted otherwise(see below) W-24-MW3R-Water sample,sample depth(feet),R=Rmsate blank.
<br /> l1}=MTBE was andyied using USEPA Method 8020
<br /> CP\C\ARCHIVEWRC01 lWQTRLWl68g399 xls
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