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i <br /> EXPLANATION j <br /> I o <br /> MW-8 ® Monitoring well with groundwater level 0 i 0 <br /> f 13.22 measured on November 26,2002 I <br /> in feet above mean sea level. I O <br /> Monitoring well decommissioned on December 5,2001 ( J <br /> in accordance with County and State requirements <br /> k I = <br /> B 1.6 Analytical results of groundwater samples reported in micrograms per liter. I _J <br /> T <0.5 B=benzene,T=toluene,E=ethylbenzene,X=xylenes <br /> E <0.5 TPHd=total petroleum hydrocarbons quantified (Cardoza Property) <br /> X <0.5 as diesel(withouttwith silica-gel preparation). i O <br /> TPHg 130 TPHg=total petroleum hydrocarbons quantified as gasoline I <br /> TPHd <50 PAHs=polycyclic aromatic hydrocarbons <br /> s PAHs: Range in groundwater <br /> naphthalene 1.4 B 70 gradient directions XMW-10 <br /> T <0.7 from 1991 to 2001 I <br /> E 1 MW-14 <br /> (200)' <br /> TPHd result after the sample extract passed B <0.5 X 1 <br /> through a silica-gel column twice. T <0.5 TPHg 400 <br /> E <0.5 TPHd 1,100/250(200)2 I <br /> <0.5 <br /> TPHg <50 I <br /> TPHd <50/<50 PAHs: <br /> n <br /> naphthalene 0.7 <br /> acenaphthene 0.2 <br /> PAHs: <0.1I <br /> phenanthrene 0.1 / <br /> E <br /> ------------------------------- ---- -- ---------/ <br /> MW-5 MW-6 MW-12 - -MW-7 MW-8 <br /> I 13.70 13.66 13.47 13.36 13.34 <br /> B 40 <br /> T 2 <br /> E 330 <br /> _ X <0.5 Former spill area;soil excavated Chevron _ <br /> TPHg 3,800 - - and replaced with fill - - - - - - pipeline <br /> TPHd 4,900/3,800(2,900)2 B 3 <br /> PAHs: Median T <0.5E <0.5 <br /> naphthalene 110 X <0.5 <br /> z acenaphthene 1.1 B 21 <br /> T 4 TPHg 270 <br /> fluorene 3.5 E 390 TPHd 260/66(53)2 <br /> phenanthrene 3.0 <br /> GRANT LINE ROAD I pyrene L2J X 41 PAHs <br /> TPHg 2,000naphthalene 0.2 -N- <br /> TPHd 1,100/520(480)2 acenaphthene 0.1 <br /> PAHs: <br /> naphthalene 86 <br /> acenaphthene 0.3 <br /> fluorene 0.4 0 20 40 <br /> phenanthrene 0.3 <br /> APPROXIMATE SCALE IN FEET <br /> ----------------------------------------------------------- <br /> GROUNDWATER ELEVATIONS AND <br /> NOTES: i ANALYTICAL RESULTS <br /> NOVEMBER 2002 <br /> Plan adapted from Figure 2 of"Additional Subsurface Investigation"by GROUNDWATER MONITORING <br /> Western Geologic Resources, Inc.,September 1991 and city map provided <br /> by the City of Tracy. Corral Hollow and Grant Line Roads Site <br /> Tracy, California <br /> Figure By Project No. <br /> dmm 002463.002.0 Figure <br /> Date Map No. 2 <br /> GEOMATRIX 01/13/03 <br />