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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 bgs) Sampled (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) <br /> Explanations(cont.): <br /> "=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. <br /> "=Repeat analysis by Modified EPA Method 8015 yielded inconsistent results.The concentrations appear to vary between the bottles. <br /> Two of the three bottles were similar to each other so results from one of those two similar bottles are reported. <br /> "=Discrete peaks,lower boiling hydrocarbons present,atypical for Diesel Fuel. <br /> Internal Standard recovery by EPA Method 82608 was above laboratory control limits.This may indicate a bias in the analysis due to the sample's <br /> matrix or an interference from compounds present in the sample.The sample results for the analytes associated with the failing internal standard are likely <br /> biased.These compounds were not detected above the Method Reporting Limit. <br /> "=Matrix Spike/Matrix Spike Duplicate results were outside of control limits. This may indicate a bias for the sample that was spiked. <br /> Hydrocarbons are higher-boiling than typical diesel fuel. <br /> Page 67 of 67 <br />