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<br /> Groundwater Monitoring Data
<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 Eth ]benzene Xylenes MTBE Observations
<br /> MW-6
<br /> MW-6(45) 08/21/97 893 2365 -1472 86,000 7,400 4,000 1,300 7,400 <1,000** No FP,No S,Yes O
<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 O
<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 3739 -2851 24,000 850 4,500 630 4,400 NA No FP,S=NE,O=NE
<br /> MW-7(39) 09/26/94 898 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 3887 -2999 24,000 800 5,700 560 4,500 NA No FP,No S,O=NE
<br /> MW-7 02/16/95 Well inaccessible
<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) 11/29/95 888 3056 -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 -1887 40,000 2,700 7,800 740 4,000 NA No FP,No S,Yes O
<br /> MW-7(48) 05/15/96 888 26 13 -1725 38,000 2,500 7,300 790 4,100 <500* No FP,No S,Yes O
<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 O
<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 05/19/97 888 2277 -1389 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 O
<br /> NA =Not applicable NS=Not sampled NE=Not evaluated O=Odor S=Sheen FP=Free product
<br /> Analytical results in parts per billion
<br /> Measurements in feet
<br /> TPHO=Total petroleum hydrocarbons as gasoline
<br /> Elevation datum is mean sea level
<br /> <=Below detection lumt for analytical methods used
<br /> *=Raised method reporting limit due to high analyte concentration requiring sample dilution
<br /> **=Raised method reporting luno due to matrix interference
<br /> Sample desioaWns,
<br /> MW-4(34)-Well ID and sample depth(feet)
<br /> W-24-MW3R-Water sample,sample d (feet),R=Rrnsate blank
<br /> N\XLW805V461"91597RI XLS Emccn 9/15/97
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