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A1
<br /> Groundwater Monitoring Data
<br /> 1995 to Present
<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 Etliyl- I otdI
<br /> Death Date of Casing Level Groundnvater Screen 11116 Benzene folueue bertzenl, X lents M 1131? Obsl mations
<br /> MW-7 02/16/95 Welllnaccesstble
<br /> MW-7 05/17/95 8 88 3050 -21 62 300 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 -21 53 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 I-P,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*[1] 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*11] 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**[1 I No FP,No S,Yes O
<br /> MW-7 02/24/97 886 2289 -1401 25,000 1,300 3,700 500 2,200 <700**[11 No FP,No S,Yts O
<br /> MW-7 05/19/97 888 2277 -1389 19,000 970 2,800 390 1,700 <300*[1] 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**[1] No FP,No S, As O
<br /> MW-7 48 11/17/97 889 2491 -1603 2,300 120 190 20 100 <50[l] No PP,No S,No O
<br /> MW-7 47 02/09/98 888 22 21 -13 33 21,000 1,100 2,800 660 2,700 4400[1] No FP,No S,Yes O
<br /> MW-7 47 05/22/98 888 1836 -948 9,580 593 919 282 942 <100 No FP,No S,Yes O
<br /> MW-7 47 0$/12/98 888 18 57 -969 5,690 289 460 197 628 <2 No FP,140 S,Yes O
<br /> MW-7 47 11/09/98 888 1968 -1080 4,970 406 612 119 520 <2 No FP,No S,Yes O
<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 O
<br /> MW-7 35 05/25/99 888 18 31 -943 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 F1',No S, Yes O
<br /> MW-7 47 12/17199[2j 898 2030 -1142 1,790 8 33 269 966 808 <2 No FP,No S,O=NE
<br /> MW-7 47 02/22/00 888 1936 -1048 2,240 159 98 149 399 <2 No FP,No S,Yes O
<br /> MW-7 41 02/22/00 888 1799 -911 33,900 6,560 1,130 1,090 4,610 <2 No FP,No S,Yes O
<br /> NA -Not applicable NS=Not sampled NE=Not evaluated 0=Odor S=Sheen FP=Free produU
<br /> Analytical results in parts per billion
<br /> Measurements in feet
<br /> PHG=rota]petroleum hydrocarbons as gasoline
<br /> Elnatton 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 Sample desr nations
<br /> **=Raised method reporting limit due to matrix interference MW-4 34 Well ID and sample depth(feet)
<br /> I'BE was analyzed using USEPA Method 8260,unless noted otherwise(see below) W 24 MW3R Water sample,sample depth(feet),R=Rmsate blank
<br /> [11=MTB/ was analyzed using USEPA Method 8020
<br /> 1
<br /> 21-Water levels collected on 1115199,samples collected on 12217/99 due to equipment failure
<br /> 131=Water level collected on 2/25100
<br /> C 1ARCO+21681Q I RLY12168y200 x1s Delta
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