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i <br /> I <br /> I <br /> 1 I <br /> EXPLANATION I Q <br /> ® Approximate location of monitoring well I O <br /> I � <br /> t � Monitoring well decommissioned on December 5,2001 I O <br /> in accordance with County and State requirements I J <br /> O <br /> I, x <br /> pH 7.50 Field parameters and analytical results of groundwater —i <br /> samples collected on November 26,2002: <br /> DO 0.91 (Cardoza Property) <br /> ORP -115 <br /> Alk 420 DO=dissolved oxygen concentration(milligrams I O <br /> Fe <0.10 per liter[mg/1]) <br /> NO3 7.5 ORP=oxidation-reduction potential(millivolts) <br /> SO4 340 ALK=alkalinity as calcium carbonate(mg/1) <br /> Fe=dissolved iron(mg/1) OMW-10 <br /> NO3=nitrate as nitrogen(mg/1) - <br /> SO4=sulfate(mg/1) ` } <br /> A A' pH 7.31 pH 7.49 pH 7.20 MW-14 <br /> DO 0.93 DO 1.32 DO 0.42 <br /> Section A-A'see Figure 4 ORP 144.3 ORP -169.5 5 <br /> Alk <br /> Alk 414 Alk 396 ORP 137.37. <br /> Fe 0.316 Fe <0.05 Al <br /> 604 <br /> NO3 8.1 NO3 7.4 Fe 2.7 <br /> SO4 276 SO4 252 SO4 153 <br /> A Ar <br /> ——————————————————————————————— <br /> MW-5 MW-6 <br /> MW-7 MW-8 <br /> Former spill area;soil excavated Chevron _ <br /> — — — — — — — — — — — — — and replaced with fill — — — — — — pipeline <br /> pH 7.31 pH 7.32 <br /> DO 0.60DO 1.04 <br /> ORP 194.1 Median ORP 78.8 <br /> Alk 600 Alk 551 <br /> Fe 1.55 Fe 0.652 <br /> NO3 1.3 NO3 4.1 <br /> GRANT LINE ROAD IS04 55.4 SO4 180 <br /> � —N— <br /> I <br /> 0 20 40 <br /> APPROXIMATE SCALE IN FEET <br /> —————————————————————————————————————————————————————————————————— <br /> 1 I <br /> . INDICATOR PARAMETERS FOR <br /> NOTES: l INTRINSIC BIOREMEDIATION <br /> Plan adapted from Figure 2 of"Additional Subsurface Investigation"by <br /> I NOVEMBER 2002 <br /> Western Geologic Resources,Inc.,September 1991 and city map provided GROUNDWATER MONITORING <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. 3 <br /> GEOMATRIX 01/13/03 <br /> i <br />