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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 Tl V Zn Hg Cr ID (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) Explanation (cont.): 1 = Due to degradation of the spiking standard, the percent recovery of this analyte was below the lower control limit.8 = 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 9 = 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 3 =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. 4 =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, 5 =Matrix spike recovery is not within the control limits.no data was flagged. 6 =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. 7 =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. I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Tables 4,5,6,7) Historical GW Tables 1Q12-CL.xlsx Page 46 of 46