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TABLE 7 TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION 2012 SEMIANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Total Chromium and Chromium VI(µg/L) Monitoring Well Screened Water- Chemical Name South Yard Baseline 2nd Qtr and 4th Qtr and 2nd Qtr and 4th Qtr and Location bearing Zone Background Event North Yard Baseline Supplemental (May 3rd Qtr and Supplemental 1st Qtr and Compliance 3rd Qtr and 1st Qtr and Compliance g ( )and 2nd Qtr CompOance Compliance(October Compliance(April Compliance(October (2008) Event(2008) Event 2008 (April 2008) 2008) Compliance(July 2008) 2008) (November 2008) (January 2009) 2009) Compliance(July 2009) 2009) (February 2010) MW-323 Intermediate Chromium NS 11 15-- NS NS <loU1 29 NS 23 <10 <10 14 26 Chromium VI NS <10 <10** NS NS <10 <10 NS 10 <10 <10 <10 <10 I-]0 Intermediate Chromium NS NS 21** NS 14 15 191 NS 42 14 14 <10 23 MW-324 (1-10) Chromium VI NS NS 20** NS <10 <10 10 NS <10 <10 <10 <10 10 MW-361 Deep Chromium NS <10 <10 NS NS <10 <10 NS <10 <10 <10 <10 3 Chromium VI NS <10 <10 NS NS <10 <10 NS <10 <10 <10 <10 <10 MW-363 Intermediate Chromium 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 MW-447S Intermediate Chromium 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 MW-447D Intermediate Chromium 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 MW-448S Intermediate Chromium 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 MW-448D Intermediate Chromium 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 EW-3 Intermediate Chromium 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 EW-4 IntermediateChromium 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 EW-5 Intermediate Chromium 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 MW-4 Intermediate Chromium 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 MW-212 Intermediate Chromium 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 MW-7 Shallow Chromium <10 NS NS 13 NS 10 18 NS 53 14 14 <10 14 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 20 20 <10 <10 MW-201 Shallow Chromium 17 NS NS 28 <10 13 22 NS 63 19 19 21 31 Chromium VI <10 NS NS <10 <10 <10 <10 NS <10 10 10 <10 <10 MW-202 Shallow Chromium <10 NS NS 15 NS <10 15 NS 33 <10 <10 <10 31 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 MW-210 Shallow Chromium <10 NS NS 11 NS <10 <10 NS 10 <10 <10 <10 14 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 MW-302 Shallow Chromium <10 NS NS 10 NS <10 13 NS 37 <10 <10 <10 14 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 MW-304 Shallow Chromium NS NS NS NS NS NS 24 NS NS NS NS 20 35 Chromium VI NS NS NS NS NS NS <10 NS NS NS NS <10 <10 MW-401 Shallow Chromium <10 NS NS NS NS <10 <10 NS 11 <10 <10 <10 6 Chromium VI <10 NS NS NS NS <10 <10 NS <10 <10 <10 <10 <10 MW-310 100-Foot Sand Chromium <10 NS NS 11 NS <10 46 NS 25 <10 <10 10 41 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 MW-211 Intermediate Chromium <10 NS NS <10 NS <10 <10 NS 17 <10 <10 <10 16 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 MW-325 Intermediate Chromium <10 NS NS <10 NS <10 31 NS 15 <10 <10 <10 26 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 <10 <10 (Page 2 of 4)