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Table 5 <br /> Historical Groundwater Analytical Data <br /> South Shore Parcels-Parcel 2A and Adjacent Areas <br /> West Weber Avenue and North Lincoln Street <br /> Stockton,California <br /> Depth Ethyl- <br /> Sample (feet, Date TPHg TPHd TPHo Benzene Toluene benzene Xylenes MTBE TBA As <br /> ID b s) Sampled (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L m /L <br /> QCDUP-3(MW-64) --- 4/17/13 1.4 1.3 0.2442 0.00088 <0.0005 <0.0005 0.0013 0.013 0.021 --- <br /> QCDUP-4(MW-55) --- 4/17/13 0.32 1.9 0.2742 <0.0005 <0.0005 <0.0005 <0.0005 0.0018 0.025 --- <br /> QCEB-1-PV --- 4/16/13 <.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-1-RM --- 4/16/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-2-PV --- 4/17/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-2-RM --- 4/17/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-3-PV --- 4/18/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCTB-1 --- 4/16/13 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCTB-2 --- 4/16/13 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QA/QC Sampling(cont.) <br /> QCDUP-1(MW-18) --- 07/17/13 0.58 0.61 0.056 37 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCDUP-2(MW-24) --- 07/16/13 <0.05 0.2241 0.2256 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCDUP-3(MW-21) --- 07/17/13 <0.05 0.41 0.05437 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCDUP-4(MW-58) --- 07/17/13 <0.05 0.06541 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCDUP-5(MW-64) --- 07/18/13 2 1.1 43 0.07 36 0.00055 <0.0005 <0.0005 0.0013 0.013 0.02 --- <br /> QCDUP-6(MW-72) --- 07/18/13 0.12 0.32 0.05437 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-1-PV --- 07/16/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-1-RM --- 07/16/13 <0.05 0.081 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-2-PV --- 07/17/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-2-RM --- 07/17/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-3-PV --- 07/18/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCEB-3-RM --- 07/18/13 <0.05 <0.05 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCTB-1 --- 07/16/13 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> QCTB-2 --- 07/16/13 <0.05 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.005 --- <br /> Explanations <br /> TPHg=Total Petroleum Hydrocarbon,gasoline range mg/I=milligrams per liter <br /> TPHd=Total Petroleum Hydrocarbon,diesel range bgs=below ground surface <br /> TPHo=Total Petroleum Hydrocarbon,oil range SPH=Separate Phase Hydrocarbons <br /> MTBE=Methyl tert-butyl ether ---=Not Analyzed <br /> TBA=Tert-Butyl Alcohol <=Below given laboratory detection limit <br /> As=Arsenic <br /> Note that MTBE,TBA and As are now reported on this table as per the new MRP. <br /> J=The reported value is below the Method Reporting Limit should be considered an estimate. <br /> 1=The method reporting limit(MRL)was raised,due to the presence of an interfering compound. <br /> 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. <br /> 3=Sample ID also known as W-25-MW3 by Chemwest Analytical Labs Inc.analytical data&within Applied GeoSystems'Subsurface Environmental Investigation Report <br /> dated October 31,1989. <br /> 4=Sample exhibits fuel pattern that does not resemble standard. <br /> 5=Lighter hydrocarbons contributed to the quantitation. <br /> 6=Heavier hydrocarbons contributed to the quantitation. <br /> 7=Sample exhibits unknown single peak or peaks. <br /> 6=QA/QC samples collected by Clayton Group Services for Unocal:Lincoln/Weber. <br /> 9=The method reporting limit for TPHd is increased due to interference from gasoline-range hydrocarbons. <br /> °=Repeated analysis yielded inconsistent results. The highest recovery value of has been reported,but should be considered an estimate. <br /> "=Matrix Spike/Matrix Spike Duplicate Results were affected by the analyte concentration already present in the un-spiked sample. <br /> "=Samples collected by Clayton Group Services for Unocal:Lincoln/Weber. <br /> "=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. <br /> 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 <br /> with the surrogate from compounds present in the sample. <br /> 5=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- <br /> analyzed. The second analysis was more consistent,and is the one that has been reported. It was extracted out of hold time,however. <br /> 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 <br /> discrete peaks which may or may not be petroleum related. <br /> Page 59 of 60 <br />