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Table 2 <br /> DPE Historic Groundwater Analytical Data—Total Petroleum hydrocarbons and BTEX <br /> South Shore Parcels-Parcel 2A and Adjacent Areas <br /> West Weber Avenue and North Lincoln Street <br /> Stockton,California <br /> Oepih Ethyl- <br /> Sample (feet, Dale TPH9 TPHd TPHo Benzene Toluene benzene Xylenes WBE TBA As <br /> ID lo s Sam led m m m I m m m (.94) <br /> A Zone Wells-Area 2A/2B and Adjacent Areas cont <br /> OPE-13 — 2/9/07 Hot sampled due to Sheen <br /> — 5/7/07 Not sampled due to Sheen <br /> — 7/3107 Not sampled due to Sheen <br /> — 10/8/07 Not sampletl-wall inaccessible <br /> — 1/21/08 Not sampled due to Sheen <br /> — 4/21/08 Not sampled due to Sheen <br /> — 7/21/08 Not sampled due to Sheen <br /> — 10/20/08 Not sampled due to SPH <br /> — 1/19/09 Not sampled due to Sheen <br /> — 4/20/09 Not sampled due to Sheen <br /> — 7/27/09 Not sampled due to Sheen <br /> — 10/19/09 Not sampled due to Sheen <br /> — 1/18/10 Not sampled due to Sheen <br /> — 4/19/10 Not sampled due to Sheen <br /> — 7/19/10 Not sampled due to Sheen <br /> — 10/18/10 Not sampled due to Sheen <br /> — 1/24/11 Not sampled due to Sheen <br /> — 4/18/11 Not sampled due to Sheen <br /> — 7/18/11 Not sampled due to Sheen <br /> — 10/17/11 Not sampled due to Sheen <br /> — 1/17/12 Not sampled due to Sheen <br /> — 4116/12 Not sampled due to Sheen <br /> Explanations: <br /> TPHg=Total Petroleum Hydrocarbon,gasoline range TBA=Tert-Butyl Alcohol SPH=Separate Phase Hydrocarbons <br /> TPHd=Total Petroleum Hydrocarbon,diesel range As=Arsenic —=Not Analysed <br /> TPHo=Total Petroleum Hydrocarbon,oil range mg4=milligrams per liter <=Below given laboratory dir ection lima <br /> MTBE=Methyl tart-butyl ether bgs=below ground surface <br /> J=The reported value is below the Method Reacting Uma should be considered an estimate. <br /> 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 /> =Sample ID also known as W-25-MA/3 by Cheowiest Analytical Labs Inc.analytical data 8 within Applied GeoSystems Subsurface Environmental Investigation Report <br /> dated October 31,1989. <br /> �=Sample exhibits fuel pattern that does not resemble standard. <br /> °=Ughter hydrocarbons contributed to Me quantaadon. <br /> =Heavier hydrocarbons contributed to the quantitation. <br /> 7=Sample exhibits unknown single peak or peaks. <br /> =OAIOC samples collected by Clayton Group Associates. <br /> =The method mpoding limit for TPHd is increased due to interference from gasoline-range hydrocarbons. <br /> 10=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 for the an ale Banters were affected by the analyte concentration already present in the un-spiked!sample. <br /> 12=Samples collected by Clayton Group Services for Unocal:LincolnlWeber. <br /> =The silica gel extract for TPHd contained a slight contamination from the material in the extract vial cop. These compounds were subtracted from the TPH value. <br /> �=Surrogate recovery for Method 8015 is atiove/cutside the control limit(s). This may indicate a bias in the analysis due to the samples matrix or an interference <br /> with the surrogate from compounds present in the sample. <br /> 1°=The original silica-gel-treated extract for sample MW-11 yielded results that Qd not appear consistent with the non-silica-gel-treated extract. The sample was re-prepared and re- <br /> analyzed. The second analysis was mom consistent,and is the one that has been reported. It was extracted out of hold time,however. <br /> °=Hydrocarbons reponed as TPH as Motor Oil do not exhibit a typical Motor Oil chromatographic pattern. These hydrocarbons are higher toting than typical diesel fuel,and/or have <br /> discrete peaks which may or may not be petroleum related. <br /> 20'1120934-Parrcce&M(Tables 4,5,6.7)Historical GW Tables 3G12L1-.xtax Page 6 of 7 <br />