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<br /> Groundwater Monitoring Data
<br /> Former ARCO Service Station No 2168, 441 Charter Way, Stockton, California
<br /> WeII Elevation Static Elevation Top
<br /> Sample of Top Water of of Total
<br /> Number Date of Casing Level Groundwater Screen TPHG Benzene Toluene Eth lbenzene Xylenes MTBE Observations
<br /> MW-7
<br /> MW-7 10/28/93 888 38 11 -2923 300 42,000 31,000 9,300 970 6,000 NA No FP,No S,Yes 0
<br /> MW-7 03/23/94 888 3663 -2775 44,000 3,000 8,600 870 5,600 NA No FP
<br /> MW-7 06/29/94 888 37 39 -2851 24,000 850 4,500 630 4,400 NA No FP,S=NE,O=NE
<br /> MW-7(39) 09/26/94 888 3867 -2979 46,000 1,600 6,400 610 4,200 NA No FP,S=NE,O=NE
<br /> MW-7 12/01/94 888 38 87 -2999 24,000 800 5,700 560 4,500 NA No FP,No S,O=NE
<br /> MW-7 02/16/95 Welllnaccesuble
<br /> MW-7 05/17/95 888 3050 -2162 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 O
<br /> MW-7(48) 11/29/95 8 88 30 56 -2168 45,000 2,100 6,400 800 3,600 NA No FP, No S,Yes O
<br /> MW-7 02/27/96 888 2775 -18 87 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 -17 25 38,000 2,500 7,300 790 4,100 <500* No FP,No S,Yes 0
<br /> MW-7 08/22/96 8 88 2667 -1779 52,000 4,400 9,900 790 4,600 <500* 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** No FP, No S, Yes 0
<br /> MW-7 02/24/97 8 88 22 89 -14 01 25,000 1,300 3,700 500 2,200 <700** No FP, No S,Yes O
<br /> MW-7 05/19/97 888 2277 -13 89 19,000 970 2,800 390 1,700 <300* 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 pans per billion
<br /> Measurements in feet
<br /> TPHG=Total petroleum by drocdrbons as gasoline
<br /> Elevation datum is mean sea level
<br /> <=Belou detection limit for anal)tical methods used
<br /> *=Raised method reporting limit due to high anal)to concentration requiring sample dilution
<br /> **=Raised method reporting limit due to matrix interference
<br /> Sam le designations
<br /> MW 4(34) Well 1D and sample depth(feet)
<br /> W 23 MW3R-Water sample sample depth(feet) R=Rmsate blank
<br /> N\YLS\0805\l4601\D61897RI XLS On=
<br /> Sheetl 7/31/97
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