ARCHIVED REPORTS_3RD QUARTER 2010 SITE STATUS REMEDIAL SUMMARY AND GROUNDWATER MONITORING REPORT

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Table 7 Groundwater Analytical Data-Metals South Shore Parcels-Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton, California Hex- avalent Sample Date Al Sb As Ba Be Ca Cd Cr Co Cu Pb K Mo Mn Na Ni Se Ag TI V Zn Hg Cr ID (mq/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) QA/QC Sampling QCEB 3/5/03 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- 0.031 <0.0005 --- RINSE 8/18' 8/18/03 --- <0.06 <0.005 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 <0.005 <0.005 <0.005 --- <0.02 <0.0002 --- RINSE 8/19' 8/19/03 --- <0.06 <0.005 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 <0.005 <0.005 0.005 --- <0.02 <0.0002 --- X-DUP 3 8/19/03 --- <0.06 0.014 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 0.0055 <0.005 <0.005 --- <0.02 <0.0002 --- Method Blank 11/12/03 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- <0.01 --- --- Method Blank 11/14/03 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- <0.01 --- --- Method Blank 11/15/03 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- <0.01 --- --- Method Blank 11/17/03 --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 11/17/03 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- <0.01 --- --- Method Blank 2/19/04 3 --- <0.06 <0.005 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 <0.005 <0.005 <0.005 --- <0.02 <0.0002 --- X-DUP 2/18/04 3 --- <0.06 0.0063 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 0.013 <0.005 <0.005 --- <0.02 <0.0002 --- Blank 2/19/04 1,4 --- <0.06 <0.005 --- <0.002 --- <0.005 <0.01 --- <0.01 <0.003 --- --- --- --- <0.02 <0.005 <0.005 <0.005 --- <0.02 <0.0002 --- X-DUP 9/7/043 --- <0.10 <0.05 --- <0.01 --- <0.01 <0.01 --- <0.01 <0.05 --- --- --- --- <0.01 <0.10 <0.001 5 <0.10 --- 0.06 <0.0002 --- Method Blank 9/7/04 4 --- <0.015 <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.15 <0.005 <0.015 --- <0.01 --- --- Equip.Blank 9/7/04 3 --- <0.10 <0.05 --- <0.01 --- <0.01 <0.01 --- <0.01 <0.05 --- --- --- --- <0.01 <0.10 <0.001 5 <0.10 --- 0.11 <0.0002 --- Method Blank 2/6/07 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 <0.01 --- --- --- --- <0.005 <0.015 <0.005 <0.015 --- <0.01 --- --- Method Blank 1/21/08 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/22/08 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/23/08 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/24/08 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/25/08 --- <0.015 <0.01 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Explanation: ---=Not Analyzed Al=Aluminum Be=Beryllium Pb=Lead Se=Selenium FD=Field duplicate Sb=Antimony Ca=Calcium K=Potassium Ag=Silver mg/I=Milligrams per liter As=Arsenic Cd=Cadmium Mo=Molybdenum TI=Thallium <=Below given laboratory detection limit Ba=Barium Cr=Chromium Mn=Manganese V=Vanadium U =Upper groundwater zone Zn=Zinc Co=Cobalt Na=Sodium ND=Not detected;laboratory detection limit unspecified in historical tables. L=Lower groundwater zone Hg=Mercury Cu=Copper Ni=Nickel W-SSC=Water sample collected from Stockton Shipping Channel ' =Due to degredation of the spiking standard,the percent recovery of this analyte was below the lower control limit. 2=The spike recovery was outside acceptance limits for the MS and or MSD. The batch was accepted based on acceptable LCS/LCSD recovery. 3 =Samples collected by Clayton Group Services for Unocal: Lincoln/Weber. 4 =Date sample prepared. 5 =Matrix spike recovery is not within the control limits. 6 =Samples collected by Wallace Kuhl for Unocal:Lincoln/Weber. =The recovery of one CCV was greater than the accepance limit. However,all analytes in associated samples were ND;therefore,a re-analysis was not performed. 8=Wallace-Kuhl did not sample due to ongoing negotiations with the City and the Regional Board. 9=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. 10=Metals analysis was inadvertently left off the COC when samples were submitted to the lab; by the time Stantec received the data back from the lab,the samples were out of hold time;therefore the analysis was not run. " =The recovery in the LCS is above control limits indicating a high bias.Since it was not detected above the Method Reporting Limit, no data was flagged. Stantm I:\Tidewater\TW Stockton(Parcel 2A-0415)\Tables\QMR Tables\2010\3Q10\Parcel2A(Tables 4,5,6,7)Historical GW Tables 3Q10.xls Page 44 of 44