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Table 4 <br /> 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 /> 71 ; <br /> epth Ethyl- <br /> SampleeetDate TPHg TPHd TPHk TPHo Benzene Toluene benzene Xylenes <br /> ID s Sampled (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) <br /> Explanations(cont.): <br /> 32=Hydrocarbons reported as TPH as Motor Oil do not exhibit a typical Motor Oil chromatographic pattern.These hydrocarbons are lower boiling than typical motor oil. <br /> 33=TPHo results may be bias+/-47.0 ug/L. <br /> 34=Results reported for P,M-Xylene that are below the method reporting limit should be considered estimates. The method detection limit for this compound is 0.09 ug/L. <br /> 35=Hydrocarbons reported as TPH Diesel do not exhibit a typical diesel chromatographic pattern. These hydrocarbons are lower boiling than typical diesel fuel. <br /> 36=Discrete peaks present,atypical for motor oil. <br /> 37=Hydrocarbons are lower boiling than typical motor oil. <br /> 38=Analysis by Modified Method EPA 8015 yielded inconsistent results. The concentrations appear to vary between the bottles. The highest valid results are reported. <br /> 39=Surrogate Recovery for test method Mod.EPA 8015 was outside of control limits. This may indicate a bias in the analysis due to the sample's matrix or an interference from compounds <br /> present in the sample. <br /> "=Gasoline hydrocarbons appeared to be present in much higher concentrations when measured via EPA Method 8015 as compared to EPA 8260B. If there is undissolved product <br /> present in the bottle it will likely be included in the 8015 value but not the 82608 value. It is probable that the sample contains un-dissolved product. <br /> 41=Discrete peaks in Diesel range,atypical for Diesel fuel. <br /> 42=Discrete peaks,lower boiling hydrocarbons present,atypical for motor oil. <br /> 43=Lower boiling hydrocarbons present,atypical for diesel fuel. <br /> 44=Matrix Spike/Matrix Spike Duplicate results were outside of control limits. This may indicate a bias for the sample that was spiked. Since the LCS recoveries were within control limits, <br /> no data are flagged. <br /> 45=City of Stockton well;well not sampled this quarter. <br /> 46=Primarily compounds not found in typical gasoline. <br /> 47=Discrete peaks,higher boiling hydrocarbons present,atypical for diesel fuel. <br /> 46=Method reporting limit increased due to interference from gasoline-range hydrocarbons. <br /> 49=Hydrocarbons reported as TPH as Diesel do not exhibit a typical Diesel chromatographic pattern. These hydrocarbons are higher boiling than typical diesel fuel. <br /> 50=Hydrocarbons reported as TPH Gasoline do not exibit a typical Gasoline chromatographic pattern. The TPH Gasoline values are attributed to the presence of 2-ethyl-l-Hexanol <br /> which Kiff Analytical does not consider to be a typical gasoline constituent. <br /> 51=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo. <br /> 52=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 /> Stantm <br /> I:\Tidewater\TW Stockton(P2A)\Tables\QMR Tables\201 1\3Q1 1\20110916-Parcel2A(Tables 4,5,6,7)Historical GW Tables 3Q11-CL.xlsx Page 69 of 69 <br />