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• 0 SPage 3 of 3 <br /> Table 1 <br /> Groundwater Elevation and Analytical Data <br /> Former ARCO Service Station#4493 <br /> 205 N Center SI Stockton CA <br /> Well Depth Groundwater Groundwater Ethyl Xylenes MTBE MIBE <br /> Well Date Elevation to Water Elevation Efevalion TPHg Benzene Toluene benzene (total) (8020) (6260) DO <br /> Number Sampled (ft MSL) (ft TOC) (it MSL) Change(f?) (ppb) {ppb)____ (ppb) (ppb) (ppb) _(ppb)_- (ppb) (mg/L) <br /> MW 8D 6/12/2002 P 1277 1734 457 2 000 70 35 370 92 46 — <br /> 9/16/2002 P 1791 514 0 57 1 100 32 11 230 35 71 -- <br /> 12/5l2002 P 1895 -618 1 04 900 16 <06 32 <5 0 49 2 7 <br /> MW 9M 6/1242002 P 1300 1924 624 770 37 7 7 110 9 4 44 — <br /> 9/16/2002 P 1692 392 232 50 2 7 <1 0 2 4 <1 0 56 — <br /> 12/5/2002 P 182$ -5 25 -1 33 <50 <0 5 <0 5 <0 5 <0 5 — 2 4 21 <br /> MW 9D 6/12/2002 P 12 98 1643 345 460 27 46 69 7 4 22 — <br /> 9/16/2002 P 1705 407 0 62 140 5 7 <1 0 <1 0 <1 0 50 <br /> 12!512002 P 1826 -528 -121 86 2 4 <1 0 <1 0 <1 0 — 15 2 0 <br /> MW 10M 6/12/2002 P 1076 1493 417 430 12 087 <0 50 1 2 5 8 <br /> 9/16/2002 P 1461 4 05 012 <50 <1 <1 0 <1 0 <1 0 2 6 <br /> 12!5/2002 P 1602 .526 -121 <50 <1 <1 0 <1 0 <1 0 - <1 0 15 <br /> MW 10D 6H 2/2002 NP 1064 1421 357 87 1 9 <0 5 <0 5 <05 — 31 <br /> 9/16/2002 NP 1465 4 01 044 <50 <0 5 <0 5 <0 5 <0 5 1 6 <br /> 1215/2002 P 15 96 -5 32 -131 <50 <05 <0 5 1 1 <0 5 — 1 0 23 <br /> MW 11M 12/5/2002 P 11 76 2042 -866 — <50 <1 0 <1 0 <1 0 <1 0 — 55 41 <br /> MW 11D 12/5/2002 P 11 72 2064 -892 <50 <1 0 <1 0 <1 0 1 1 — 2 2 3 2 <br /> T6 1 12/31/'2001 — <50 40 50 <0 50 <0 50 <0 50 <br /> OCTB 3/13/2002 <50 <0 50 <0 60 <0 50 <0 50 <br /> Notes <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> MIBE=Methyl tert butyl ether <br /> DC=Dissolved oxygen <br /> I=feet <br /> MSL=mean sea level <br /> TOC=top of casing <br /> ppb=parts per billion <br /> mg/L=milligrams per liter <br /> P/NP=purged/not purged <br /> `=analyzed using EPA Method 8260 <br /> <or ND=below given laboratory detection limit <br /> 8020=Analyzed by EPA Method 8020 <br /> 8260=Analyzed by EPA Method 8260 <br /> NS=Not Surveyed <br /> =not measured/analyzed or not applicable <br /> =Sample was reanalyzed past the EPA recommended holding time <br /> `=Hydrocarbon pattern is present in the requested fuel quantification range but does not resemble the pattern of the requested fuel <br /> =The surrogate recovery for this sample cannot be accurately quantified due to Interference form ooeluting organic compounds present in the sample extract <br /> Beginning 2nd quarter 2002 an analytical data review summary Is included in the text <br /> I <br /> k US SP ARC0k044035Cuerteiryl2_OTR 0257abie 12_3 <br />