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

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Table 4 Groundwater Analytical Data-Total Petroleum Hydrocarbons and BTEX South Shore Parcels-Parcel 2A and Adjacent Areas West Weber Avenue and North Lincoln Street Stockton,California Depth Ethyl- Sample (feet, Date TPHg TPHd TPHk TPHo Benzene Toluene benzene Xylenes bs Sampled (Mg/1) (mg/1) (mg/1) m /I m /I m /I (mg/1)ID QA/QC Sampling(cont.) QCDUP-1 (MW-45) 7/21/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-2(MW-44) 7/21/10 <0.05 0.073 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-3(MW-23) 7/21/10 <0.05 0.31 --- 0.07 36 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-4(MW-27) 7/20/10 <0.05 0.05441 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-5(MW-61) 7/20/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-6(MW-69) 7/20/10 <0.05 0.077 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCDUP-7(MW-31) 7/20/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCEB-1-RG 7/20/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCEB-1-RM 7/20/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCEB-2-RG 7/21/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCEB-2-RM 7/21/10 <0.05 <0.05 --- <0.05 <0.0005 <0.0005 <0.0005 <0.0005 QCEB-3-RG 7/22/10 <0.05 --- --- --- <0.0005 <0.0005 <0.0005 <0.0005 QCTB-1 7/20/10 <0.05 --- --- --- <0.0005 <0.0005 <0.0005 <0.0005 QCTB-2 7/21/10 <0.05 --- <0.0005 <0.0005 <0.0005 <0.0005 QCTB-3 7/22/10 <0.05 --- <0.0005 <0.0005 <0.0005 <0.0005 Explanations: J=The reported value is below the Method Reportin Limit should be considered an estimate. 2=Sample ID also known as W-21-MW2 by Mobile Chem Labs Inc.analytical data and Applied GeoSystems'Subsurface Environmental Investigation Report dated October 31,1989. 3=Sample ID also known as W-25-MW3 by Chemwest Analytical Labs Inc.analytical data&within Applied GeoSystems'Subsurface Environmental Investigation Report dated October 31,1989. 4=Sample exhibits fuel pattern that does not resemble standard. 5=Lighter hydrocarbons contributed to the quantitation. 6=Heavier hydrocarbons contributed to the quantitation. =Sample exhibits unknown single peak or peaks. 8=QA/QC samples collected by Clayton Group Associates. 9=The method reporting limit for TPHd is increased due to interference from gasoline-range hydrocarbons. 10=Repeated analysis yielded inconsistent results for TPHg. The highest recovery value of has been reported,but should be considered an estimate. 11=Matrix Spike/Matrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentration already present in the un-spiked sample. 12=Samples collected by Clayton Group Services for Unocal:Lincoln/Weber. 13=The silica gel extract for TPHd contained a slight contamination from the material in the extract vial cap. These compounds were subtracted from the TPH value. 14=Surrogate recovery for Method 8015 is above/outside the control limit(s). This may indicate a bias in the analysis due to the sample's matrix or an interference with the surrogate from compounds present in the sample. 15=The original silica-gel-treated extract for sample MW-11 yielded results that did not appear consistent with the non-silica-gel-treated extract. The sample was re-prepared and re- analyzed. The second analysis was more consistent,and is the one that has been reported. It was extracted out of hold time,however. 16=Hydrocarbons reported as TPH as Motor Oil do not exhibit a typical Motor Oil chromatographic pattern. These hydrocarbons are higher boiling than typical diesel fuel,and/or have discrete peaks which may or may not be petroleum related. Stantec I:\Tidewater\TW Stockton(Parcel 2A-0415)\Tables\QMR Tables\2010\3Q10\Parcel2A(Tables 4,5,6,7)Historical GW Tables 3Q10.xls Page 64 of 66