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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 /> Apr-89 34 23 4 -- <br /> Jan-92 -- -- -- 169 20 <br /> Jan-97 46 26 3 76 16 <br /> Apr-98 37 11 3 61 18 <br /> Jan-99 39 12 2 38 38 <br /> Jan-02 27 15 4 38 26 <br /> Jan-04 40 18 3 34 8 <br /> Jan-05 47 19 3 34 9 <br /> Apr-06 37 13 1 30 10 <br /> Apr-07 34 12 0.1 36 14 <br /> Apr-08 32 8 0.0 31 17 <br /> Apr-09 26 3 0.1 34 15 <br /> Apr-10 17 3 0.2 32 9 <br /> Apr-11 6 2 0.2 16 7 <br /> Jul-11# 4 0.1 NA 12 1 <br /> Oct-11# 4 0.1 NA 12 5 <br /> Jan-12# 4 0.01 NA 6 1 <br /> Apr-12# 6 0.1 NA 8 7 <br /> 2013 1st Semi-Annual Groundwater Monitoring Report 3909-21 <br /> SPX Cooling Technologies Dudek <br /> Stockton,California Page 1 of 2 August 2013 <br />