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Table 5 Historical 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 Be Be Ca Cd Cr Co Cu Pb K Mo Mn Na Ni Se Ag TI V Zn Hg Cr ID (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 Method Blank 9/7/04° --- <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' --- <0.10 --- <0.01 --- <0.01 <0.01 --- <0.01 <0.05 --- --- --- --- <0.01 <0.10 <0.001' <0.10 --- 0.11 <0.0002 --- Method Blank 2/6/07 --- <0.015 --- <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 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/22/08 --- <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/23/08 --- <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/24/08 --- <0.015 --- <0.001 --- <0.005 <0.005 --- <0.005 --- --- --- --- --- --- --- --- --- --- --- <0.0005 --- Method Blank 1/25/08 --- <0.015 --- <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 Note that As(Arsenic)was removed from this table and is now reported on Table 4. 1=Due to degradation of the spiking standard,the percent recovery of this analyte was below the lower control limit. e=City of Stockton well;well not sampled this quarter. 2=The spike recovery was outside acceptance limits for the MS and or MSD. The batch was accepted based on s=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. acceptable LCS/LCSD recovery. 10=Metals analysis was inadvertently left off the COC when samples were submitted to the lab;by the time Stantec s =Samples collected by Clayton Group Services for Unocal:Lincoln/Weber. received the data back from the lab,the samples were out of hold time;therefore the analysis was not run. ° =Date sample prepared. 11=The recovery in the LCS is above control limits indicating a high bias.Since it was not detected above the Method Reporting Limit, a =Matrix spike recovery is not within the control limits. no data was flagged. s =Samples collected by Wallace Kuhl for Unocal:Lincoln/Weber. 12=Matrix Spike/Matrix Spike Duplicate results were outside of control limits.This may indicate a bias for the sample that was spiked. ' =The recovery of one CCV was greater than the acceptance limit. However,all analytes in associated samples Since the LCS recoveries were within control limits,no data are flagged. were ND;therefore,a re-analysis was not performed. Stantec 20120924-Parcel2A(Tables 4,5,6,7)Historical GW Tables 3412-CL.xlsx Page 46 of 46