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TABLE 7 TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION 2013 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 2 of 4 Total Chromium and Chromium VI(pg/L) Monitoring Well Screened Water- Chemical Name South Yard Baseline 2nd Q[r and 4th Qtr and 1st Qtr and 2nd Qtr and 4th Qtr and 1st Qtr and 2nd Qtr and Location bearingZone Background Event North Yard Baseline Supplemental (May 3rd Qtr and Supplemental 3rd Qtr and 3rd Qtr and (**)and 2nd Qtr Compliance Compliance(October Compliance(January Compliance(April Compliance(October Compliance(February Compliance(April (2008) Event(2008) Event(2008) (April 2008) 2008) Compliance(July 2008) 2008) (November 2008) 2009) 2009) Compliance(July 2009) 2009) 2010) 2010) Compliance(July 2010) MW-323 Intermediate Chromium NS 11 15** NS NS <IOUJ 29 NS 23 <10 <10 14 26 9 14 Chromium VI NS <10 <10** NS NS <10 <10 NS 10 <10 <10 <10 <10 <IOUJ <10 MW-324(1-10) Intermediate Chromium NS NS 21** NS 14 15 191 NS 42 14 14 <10 23 14 22 Chromium VI NS NS 20** NS <10 <10 10 NS <10 <10 <10 <10 10 10 10 MW-361Dccp Chromium NS <10 <10 NS NS <10 <10 NS <10 <10 <10 <10 3 3 3 Chromium VI NS <10 <10 NS NS <10 <10 NS <10 <10 <10 <10 <10 <lOUJ <10 MW-363 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-4475 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS 7,090 Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS 7,080 MW-447D Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS 2,530 Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS 2,360 MW-4485 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS 2,300 Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS 2,220 MW-448D Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4,110 Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS 4,060 MW-4495 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-449D Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-4505 intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-450D Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS EW-3 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS EW-4 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS EW-5 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-4 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-212 Intermediate Chromium NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS Chromium VI NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS MW-7 Shallow Chromium <10 NS NS 13 NS 10 18 NS 53 14 14 <10 14 7 13 Chromium Vl <10 NS NS <10 NS <10 <10 NS <10 20 20 <10 <10 <10 <10 MW-201 Shallow Chromium 17 NS NS 28 <10 13 22 NS 63 19 19 21 31 11 32 Chromium VI <10 NS NS <10 <10 <10 <10 NS <10 10 10 <10 <10 <10 10 MW-202 Shallow Chromium <10 NS NS 15 NS <10 15 NS 33 <10 <10 <10 31 26 8 Chromium Vl <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10 MW-210 Shallow Chromium <10 NS NS 11 NS <10 <10 NS 10 <10 <10 <10 14 12 10 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 <lOUJ <10 MW-302 Shallow Chromium <10 NS NS 10 NS <10 13 NS 37 <10 <10 <10 14 14 9 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 <10 <10 MW-304 Shallow Chromium NS NS NS NS NS NS 24 NS NS NS NS 20 35 8 27 Chromium VI NS NS NS NS NS NS <10 NS NS NS NS <10 <10 <10 10 MW-401 Shallow Chromium <10 NS NS NS NS <10 <10 NS 11 <10 <10 <10 6 7 4 Chromium Vl <10 NS NS NS NS <10 <10 NS <10 <10 <10 <10 <10 <IoUJ <10 MW-310100-Foot Sand Chromium <10 NS NS 11 NS <10 46 NS 25 <10 <10 10 41 12J 30 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 <l0UJ <10 MW-211 Intermediate Chromium <to NS NS <10 NS <10 <10 NS 17 <10 <10 <10 16 13 II Chromium Vl <10 NS NS <10 NS <]0 <10 NS <10 <10 <10 <10 <10 <IoUJ <10 MW-325 Intermediate Chromium <10 NS NS <10 NS <10 31 NS 15 <10 <10 <10 26 14 12 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 <lOUJ <10 Notes: *=April 2007 data from Dudek M&S Report **=baseline samples ***=The comparison is between the most recent concentration and the maximum concentration reported since the baseline sampling event in 2008.A value of zero indicates the current concentration is the highest. Bold—Concentration greater than Water Quality Objective(WQO) J=Estimated laboratory value µgQ.=microgram per liter NM=not meaningful because the chemical has not been detected above the laboratory analytical reporting limit. NS=not sampled UJ=Non-detect value is estimated