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Table 9. Estimated Areas of the Total Dissolved Chromium Plumes <br /> in the Shallow and Intermediate Zones <br /> Estimated Area of Estimated Area of Estimated Area of Estimated Area of Estimated Area of <br /> >50-ug/L Total >500-ug/L Total >5000-ug/L Total >50-ug/L Total >500-ug/L Total <br /> Dissolved Chromium Dissolved Chromium Dissolved Chromium Dissolved Chromium Dissolved Chromium <br /> Date Plume in the Plume in the Plume in the Plume in the Plume in the <br /> Shallow Zone Shallow Zone Shallow Zone Intermediate Zone Intermediate Zone <br /> (acres)' (acreS)2 (acres)3 (acres)' (acres)2 <br /> Jul-12# 3 0.1 NA 16 5 <br /> Oct-12# 2 0.01 NA 16 5 <br /> Jan-13# 3 0.1 0.01 9 5 <br /> Apr-13# 1 0.1 0.01 10 6 <br /> NOTES: <br /> Plume Areas obtained from DUDEK groundwater monitoring reports(2003-2010) <br /> Remedial well field began pumping in 1992. <br /> --=No estimated Plume Area available. <br /> =Extent of Total Dissolved Chromium concentrations greater than 50 ug/L. <br /> z=Extent of Total Dissolved Chromium concentrations greater than 500 ug/L. <br /> 3=Extent of Total Dissolved Chromium concentrations greater than 5000 ug/L. <br /> "=Quantile Kriging used to estimate plume extents. Previous estimates used logarithmic interpolation. <br /> 2013 1st Semi-Annual Groundwater Monitoring Report 3909-21 <br /> SPX Cooling Technologies Dudek <br /> Stockton,California Page 2 of 2 August 2013 <br />