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EXPLANATION <br /> MW-2 Monitoring well location <br /> MW-1 Groundwater extraction well location FN <br /> DW-2 # Deeper monitoring well location <br /> (not used in contouring) <br /> DW-I X' Destroyed well location <br /> NS <br /> Overhead electrical line(OE) ii / <br /> Electrical line(E) 0"32J <br /> Unknown utility line <br /> Sanitary sewer line(SAN) ND 21 NS 0 50 1 00ft <br /> Water line W N8 <br /> 440 <br /> Product piping fine(P) <br /> Fenceline 1500 LNS <br /> 000--, <br /> Groundwater extraction14 <br /> system piping 2.6/ f �♦ 16V <br /> loo MTBE isoconcentration contour, <br /> in micrograms per liter(pgfl, 12 <br /> dashed where inferred 20 NDA <br /> .Well designation 15 1.0 <br /> 24 <br /> MTBE —MTBE concentrations are in pg/L - ; N &OW <br /> 17 I <br /> Notes: I kqw- 0.49J NS NS <br /> .fiJ <br /> J=Analyte was detected at a concentration below 4MVV-17 <br /> Ii 7.3 <br /> the reporting limit and above the laboratory method INA/ <br /> detection limit. Reported value is estimated, NS <br /> NA=Not analyzed <br /> ND=Not detected <br /> 10 <br /> NS=Not sampled <br /> 10Y000 260 1001 0 <br /> A Sampled February 10,2010. 1 - <br /> ,000 <br /> Id nnn <br /> 99 872 <br /> F <br /> 1� ND <br /> ND N D9 17A Tosco <br /> 6 9A <br /> 52 <br /> WiW-27 <br /> I= 4- <br /> ® �'' <br /> No . <br /> L -1 <br /> Figure 7 <br /> F—NA7 MTBE in Groundwater Isoconcentration Map <br /> February 3, 2010 <br /> Shell Stockton Terminal <br /> k ki 3515 Navy Drive, Stockton, California <br /> I:kShelik6-chars\2417--1241729-Stockton 3515 Navy Drive\241729-REPORTS\241729-RPT27-1&2QI01241729 1QM10-MTBE.DWG(7/2612010) <br />