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• • i <br /> Table 2 <br /> DPE Historic Groundwater Analytical Data—Total Petroleum hydrocarbons and BTEX <br /> South Shore Parcels-Pamel 2A and Adjacent Areas <br /> West Weber Avenue and North Lincoln Street <br /> Stockton,California <br /> Oepth Ethyl- <br /> Sample (feat. Data TPHg TPI-d TPH. Benzene Toluene benzene Xylenes MTBE TBA As <br /> ID b s Sam letl m m an d m 4 m m m m <br /> Explanations(cornk <br /> 17=The sample was analyzed by EPA Method 820B using a bottle Nat contained a heatlspace bubble greater than 1/4tinch in diameter. All of the HCI-preserved bottles for this sample <br /> contained heatlspace bubbles. This can happen with alkaline samples.because the Bicarbonate reacts with HCI to fond Carton Dioxide. <br /> '=Hydrocarbons reported as TPH as Diesel do not exhibit a typical Diesel chromatographic pattem. These hydrocarbons are higher boiling Nan typical diesel fuel,and/or have discrete <br /> peaks which may or may not be petroleum related. <br /> °=Surogate recoveryor Method 8015 was above the wnlml limit(s). Since there were no Diesel or Motor-0l range hydrocarbons detected in the sample,no data areflagged. <br /> =Samples were analyzed by EPA Method 82608 using a bottle that contained a heatlspace bubble greater than 1/4inch in diameter. <br /> p1=Sample was re-analyzed to confirm the presence of compounds that were detected in the first analysis. <br /> =The Method Blank associated with sample MW-18 contained 81 ugl TPH as Motor Oil. <br /> z'=Samples collected by Wallace Kuhl for Unocal:UnoolnM'eber. <br /> r°=Hydrocarbons reported as TPH as motor oil do not exhibit a typical motor oil chromatographic pattem. <br /> '=The Method Blank associated with samples MW-39 contained 88 uglL TPH as Motor Oil. <br /> a'=Matrix SpikelMatiix Spike Duplicate Results for the analyte Toluene were affected by the analyte concentration already present in the un-spiked sample. <br /> �=Hydrocarbons reported as TPH as Diesel do not exhibit a typical Diesel chromatographic pattem. There are discrete peaks which may or may not W petroleum related. <br /> °5=Hydrocamons reported as TPH as Motor Ol do not exhibit a typical Motor Oil chromatographic pattem. These hydrocarbons are lower boiling than typical motor all. <br /> 3°=Hydrocarbons reloaded as TPH as Gasoline do not exhibit a typical Gasoline chromatographic pattem.These spikes are most likely due to he presence of le"hydrafumn in the sample. <br /> =Results reported for P.M-Xylene that are below the method repotting limit should be considered estimates. The method detection limit for Mis compound is 0.37 ug/L. <br /> m=Hydrocarbons reported as TPH motor oil do not exhibit a typical Motor Oil chromatographic pattem. There are discrete Peaks which may or may not be petroleum related. <br /> =Hydrocarbons reported as TPH as Motor Oil do not exhibit a typical Motor Oil chromatographic pattem.These hydrocarbons are lower boiling than typical motor oil. <br /> "=TPHo resulls may b,bias*/-47.0 ug/L <br /> cx=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 uq L. <br /> 05=Hydrocarbons reported as TPH Desel do not exhibit a typical diesel chromatographic pattem. These hydrocarbons are lower boiling Nan typical diesel fuel. <br /> =Discrete peaks present,atypical for motor oil. <br /> 37=Hydrocarbons are lower boiling than typical motor all. <br /> 05=Analysis by Modified Method EPA W15 yielded inconsistent results. The concermfions appear to vary between the bottles. The highest valid reruns are reported. <br /> w=Surrogate Recovery for test memod Mod.EPA 8015 was outside of control limits. This may indicate a bias in the analysis due to the samples matrix or an interference from compounds <br /> present in the sample. <br /> b=Gasoline hydrocarbons appeared to be present in much higher concentrations when measured via EPA Method 8015 as compared to EPA 82608. If there is undfincived product <br /> present in the bottle it will likely be included in the W15 value but not the 6260B value. It is probable that the sample contains undissolved product. <br /> 41=Discrete peaks in Diesel range,atypical far Diesel fuel. <br /> �=Discrete peaks,lower boiling hydrocarbons present,atypical for motor oil. <br /> "=Lower boiling hydrocartlons present,atypical for diesel fuel. <br /> =Matrix Spike/MaMx 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 /> w5=City of Stockton well;well not sampled this quarter. <br /> =Primarily compounds not found In typical gasoline. <br /> =Discrete peaks,higher boiling hydrocarbons present,atypical for diesel fuel. <br /> Method reporting limn increased due o interference from gasoline-range hydrocarbons. <br /> =Hydrocarbons reponed as TPH as Diesel do not exhibit a typical Diesel chromatographic Pattern. These hydrocarbons are higher boiling than typical diesel fuel. <br /> n=Hydrocarbons repprted as TPH Gasoline do not exhibit a typical Gasoline chromatographic pattem. The TPH Gasoline values are attributed to the presence of 2ethyi-1-Hexanol <br /> which Kin Analytical does not consider to be a typical gasoline constituent. . <br /> 5'=Wells destroyed in November 2008 as pad of the Unocal excavation activities by Treadwell and Rollo. <br /> 51=Repeat analysis by Modred EPA Method 8015 yielded inconsistent results.The concentrations appear to vary between the battles. <br /> Two of the three battles were similar to each other so results fmm one of those two similar bottles are repoded. <br /> =Dlscrom peaks,lower boiling hydrocarbons present,atypical for Dlesel Fuel. <br /> Starnec <br /> 20120924-ParcecA(Tables 4.5.6.7)Hlstodcat GW Tables 3012-CL.xhx Pape 7 of <br />