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Table 3
<br /> Historical Groundwater Analytical Data-Fuel Oxygenates and VOCs
<br /> South Shore Parcels-Parcel 2A and Adjacent Areas
<br /> West Weber Avenue and North Lincoln Street
<br /> Stockton,California
<br /> sec- Iso- p-Iso- 4-Iso- 1,2,4-Tri- 1,3,5-Tri-
<br /> Methylene n-Butyl- tert-Butyl- Butyl- propyl- propyl- propyl- Naph- Propyl- n-Propyl- methyl- methyl- Other
<br /> Sample Date DIPE EtBE TAME Methanol Ethanol chloride TCE, 1,2-DCA Acetone benzene benzene benzene benzene toluene toluene thalene benzene benzene benzene benzene Chloroform VOCs`
<br /> ID Sampled m/I m/I m/I (mg/,) m/1 m/I m/I m/I m/I (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1) (mg/1)
<br /> Explanations(cont.):
<br /> '=The method reporting limit(MRL)was raised,due to the presence of an interfering compound. 31=The MRL for 1,2-Dichloropropane has been increased due to the presence of an interfering compound.
<br /> 2=The method reporting limit for Chloromethane was raised,due to the presence of an interfering compound. 32=The method reporting limit for DIPE was raised due to the presence of an interfering compound.
<br /> 3=The method reporting limit for 1,2,3-Trichloropropane was raised,due to the presence of an interfering compound. 33=Ethanol detected at 11 ug/L.
<br /> °=The method reporting limit for 1,2,3-Trichlorobenzene was raised,due to the presence of an interfering compound. 34=The method reporting limit for Naphthalene was raised,due to the presence of an interfering compound.
<br /> 5=The method reporting limit for 1,1,2-Trichloroethane was raised,due to the presence of an interfering compound. 35=The method reporting limit for 2+4-Chlorotoluene was raised,due to the presence of an interfering compound.
<br /> e=The method reporting limit for 1,1,2,2-Tetrachloroethane was raised,due to the presence of an interfering compound. =The method reporting limit for Ethanol is increased due to the presence of an interfering compound.
<br /> =Samples were collected by Clayton Group Services for Unocal:Lincoln/Weber. 37=Carbon Tetrachloride detected at 0.72 ug/L.
<br /> e=The method reporting limit for 1,2,4-Trichlorobenzene was raised,due to the presence of an interfering compound. 38=Carbon Tetrachloride detected at 1.5 ug/L.
<br /> s=The method reporting limit for 2,2-Dichloropropane was raised,due to the presence of an interfering compound. 39=The method reporting limit for 1,2-Dichloroethane has been increased due to the presence of an interfering compound.
<br /> 10=The Matrix Spike/Matrix Spike Duplicate Results were affected by the analyte concentration already present in the un-spiked sample. 4°=The method reporting limit for methanol has been increased due to the presence of an interfering compound.
<br /> 11=Blank Analyzed 02/19/04. 0.1=Chloromethane detected at 0.76 ug/L.
<br /> 12=The method reporting limit for Bromodichloromethane was raised,due to the presence of an interfering compound. 0.2=Bromoform detected at 0.51 ug/L.
<br /> 13=Samples were analyzed by EPA Method 82608 using a bottle that contained a headspace bubble greater than 1/4-inch in diameter. 0.3=Vinyl Chloride detected at 0.60 ug/L.
<br /> 14=Bromodichloromethane detected at.0031 ug/L. 0.0.=Chloromethane detected at 0.95 ug/L.
<br /> 15=Bromodichloromethane detected at.0026 ug/L. 0.5=Chloromethane detected at 0.87 ug/L.
<br /> 16=Bromodichloromethane detected at 1.3 ug/L. 4s=Chloromethane detected at 0.85 ug/L.
<br /> 17=1,4-Dichlorobenzene was detected at 0.00059 ug/L. 47=The MRL for 1,2-Dibromo-3-chloropropane has been increased due to the presence of an interfering compound.
<br /> 18=Sample was re-analyzed to confirm the presence of compounds that were detected in the first analysis. 48=Repeat analysis by Modified Method EPA 8015 yielded inconsistent results. The concentrations appear to vary.
<br /> "=Samples were collected by Wallace Kuhl for Unocal:Lincoln/Weber. 49=Matrix Spike/Matrix Spike Duplicate results for Chlorobenzene were outside of control limits. This may indicate a bias
<br /> 20=The method reporting limit for Styrene was raised,due to the presence of an interfering compound. for the sample that was spiked.
<br /> 2'=1,4-Dichlorobenzene detected at 1.2 ug/L. s°=Matrix Spike/Matrix Spike Duplicate results were outside of control limits. This may indicate a bias for the sample that was spiked.
<br /> 22=Styrene detected at 2.9 ug/L. 51=Matrix Spike/Matrix Spike Duplicate results were affected by the analyte concentrations already present in the un-spiked sample.
<br /> 23=1,1,2-Trichloroethane detected at 2.7 ug/L. 52=Wallace-Kuhl did not sample due to ongoing negotiations with the City and the Regional Board.
<br /> 24=Bromodichloromethane detected at 0.70 ug/L. 53=Bromodichloromethane at 1.2 ug/L.
<br /> 25=Chloroform detected at 8.6 ug/L,Bromodichloromethane detected at 7.0 ug/L s4=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo.
<br /> 26=Bromodichloromethane detected at 0.00097 mg/I 55=The method reporting limit for Bromodichloromethane was raised,due to the presence of an interfering compound.
<br /> 27=The method reporting limit for TCE was raised,due to the presence of an interfering compound. s5=The method reporting limit for Chloromethane,1,1,2-TCA and 1,1,2,2-Tetrachloroethane was raised,due to the presence of an interfering compound.
<br /> 28=The method reporting limit for DIPE was raised,due to the presence of an interfering compound. 57=Chloroform detected at 2.2 ug/L.
<br /> 29=The method reporting limit for 1,3,5-Trimethylbenzene was raised,due to the presence of an interfering compound 55-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 /> 30=Matrix Spike/Matrix Spike Duplicate results were outside of control limits.This may indicate a bias for the sample that was spiked. 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 /> Since the LCS recoveries were within control limits,no data are flagged. biased.These compounds were not detected above the Method Reporting Limit.
<br /> Stantec
<br /> 20120924-Parcel2A(Tables 4,5,6,7)Historical GW Tables 3012-CL.xlsx Page 46 of 46
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