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TABLE 7 TOTAL AND HEXAVALENT CHROMIUM RESULTS EVALUATION 2012 ANNUAL 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 Qtr and 2nd Qtr and 2nd Qtr and Location bearingZone Background Event North Yard Baseline Supplemental (May 3rd Qtr and 4th Qtr and Compliance Supplemental 1st Qtr and Compliance 3rd Qtr and 4th Qtr and Compliance 1st Qtr and Compliance (**)and 2nd Qtr Compliance Compliance(April Compliance(April (2008) Event(2008) Event 2008 (April 2008) 2008) Compliance(July 2008) (October 2008) (November 2008) (January 2009) 2009) Compliance(July 2009) (October 2009) (February 2010) 2010) Chromium NS 11 15** NS NS <IOUJ 29 NS 23 <10 <10 14 26 9 MW-323 Intermediate Chromium VI NS <10 QO** NS NS QO QO NS 10 QO <10 <10 <10 <lOUJ Chromium NS NS 21** NS 14 15 191 NS 42 14 14 <10 23 14 MW-324(I-10) Intermediate Chromium VI NS NS 20** NS QO QO 10 NS QO QO QO QO 10 10 Chromium NS <10 <10 NS NS <10 <10 NS <10 <10 <10 <10 3 3 MW-361 Deep Chromium VI NS QO QO NS NS QO QO NS <10 QO QO QO <10 <IOUJ MW-363 Intermediate Chromium 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 MW-4475 Intermediate Chromium 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 MW-447D Intermediate Chromium NS NS NS I 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 MW-4485 Intermediate Chromium 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 MW-448D Intermediate Chromium 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 MW-4495 Intermediate Chromium 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 MW-449D Intermediate Chromium 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 MW-4505 Intermediate Chromium 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 MW-450D Intermediate Chromium 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 EW-3 Intermediate Chromium 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 EW-4 Intermediate Chromium 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 EW-5 Intermediate Chromium 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 MW-4 Intermediate Chromium 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 MW-212 Intermediate Chromium 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 MW-7 Shallow Chromium <10 NS NS 13 NS 10 18 NS 53 14 14 <10 14 7 Chromium VI <10 NS NS QO NS <10 <10 NS <10 20 20 <10 <10 <10 MW-201 Shallow Chromium 17 NS NS 28 <10 13 22 NS 63 19 19 21 31 11 Chromium VI <10 NS NS <10 <10 <10 <10 NS <10 10 10 <10 <10 <10 MW-202 Shallow Chromium <10 NS NS 15 NS <10 15 NS 33 <10 <10 <10 31 26 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 QO QO QO MW-210 Shallow Chromium <10 NS NS 11 NS <10 <10 NS 10 <10 <10 <10 14 12 Chromium VI <10 NS NS <10 NS <10 <10 NS <10 <10 <10 QO <10 <IOUJ MW-302 Shallow Chromium <10 NS NS 10 NS <10 13 NS 37 <10 <10 < 14 14 Chromium VI QO NS NS 10 NS QO QO NS QO QO QO QO QO MW-304 Shallow Chromium NS NS NS NS NS NS 24 NS NS NS NS 20 35 8 Chromium VI NS NS NS NS NS NS QO NS NS NS NS QO QO <10 MW-401 Shallow Chromium <10 NS NS NS NS <10 <10 NS 11 <10 <10 <10 6 7 Chromium VI <10 NS NS NS NS QO QO NS <10 QO <10 6 <10 Qo <IOUJ MW-310 100-Foot Sand Chromium <10 NS NS 11 NS <10 46 NS 25 <10 <10 10 41 12J Chromium VI <10 NS NS QO NS QO QO NS <10 <10 <10 Qo <10 QOUJ MW-211 Intermediate Chromium <10 NS NS <10 NS <10 <10 NS 17 <10 <10 16 13 Chromium VI QO NS NS QO NS QO QO NS <10 QO QO QO <IOUJ Chromium <10 NS NS <10 NS <10 31 NS 15 <10 <10 <]0 26 14 MW-325 Intermediate Chromium VI <10 NS NS QO NS QO QO NS <10 <10 <10 <10 QO <IOUJ