|
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 /> s
<br /> Stockton,California
<br /> sec- Iso- p-Iso- 4-Iso- 1,2,4-Tri- 1,3,5-Tri-
<br /> Methylene n-Butyl- tort-Butyl- Butyl- propyl- propyl- propyl- Naph- Propyl- n-Pfopyi- methyl- methyl- Other
<br /> Sample Date DIPE EfBE TAME Methanol Ethanol chloride TCE 1,2-DCA Acelone benzene benzene benzene benzene toluene toluene thalene benzene benzene benzene benzene Chloroform VOCs`
<br /> 1D Sampled m mfl mA m4 mA m mfl m in mR mA mA m0 m1€ T!A m m4 m4 (mg/1) mli m I mfl
<br /> Explanations(cont.}:
<br /> '=The method reporting limit(MRL)was raised,due to the presence of an interfering compound. 3'=The MRL far 1,2-Dichloropropane has been increased due to the presence of an interfering compound.
<br /> '=The method reporting limit for Chloromethane was raised,due to the presence of an interfering compound. Sz=The method reporting limit for DIPE was raised due to the presence of an interfering compound.
<br /> '=The method reporting limit for 1,2,3-Trichloropropane was raised,due to the presence of an interfering compound, a'=Ethanol detected at 11 ugfL.
<br /> =The method reporting limit for 1,2,3-Trichlorebenzene 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 /> 6-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 ralsed,due to the presence of an interfering compound.
<br /> 6=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 10 the presence of an interfering compound.
<br /> s
<br /> =Samples were collected by Clayton Group Services for Unocal:LincolnlWebef. 37=Carbon Tetrachloride detected at 0.72 ug1L.
<br /> 6=The method reporting limit for 1,2,4-Trichlorobenzene was raised,due to the presence of an interfering compound. 36=Carbon Tetrachloride detected at 1.5 ugfL. p
<br /> 9=The method reporting limit for 2,2-Dichloropropane was raised,due to the presence of an interfering compound. as=The method reporting limit for 1,2-Dichicroethans has been increased due to the presence of an Interfering compound.
<br /> 1e=The Matrix SpikelMatrix Spike Duplicate Results were affected by the analyte concentration already present in the un-spiked sample. i0=The method reporting limit for methanol has been increased due to the presence of an interfering compound.
<br /> Blank Analyzed 02119104. "'=Chloromethane detected at 0.76 uglL.
<br /> 12=The method reporting limit for Bromodichloromethane was raised,due to the presence of an interfering compound. 42=Bromoform detected at 0.51 ugfL.
<br /> r'=Samples were analyzed by EPA Method 82608 using a bottle that contained a headspace bubble greater than 1144nch in diameter. 40=Vinyl Chloride detected at 0.60 ugfL.
<br /> 14=Bromodichloromethane detected at.0031 ugfL. -04=Chloromethane detected at 0.95 ugfL.
<br /> '6=Bromodichloromethane detected at.0026 ugfL. 4'=Chloromethane detected at 0.67 ug1L.
<br /> 16=Bromodichloromethane detected at 1.3 ugfL. 46 r Chloromethane detected at 0.85 ugfL.
<br /> "=1,4-131chlorobenzene was detected at 0.00059 ugfL. A7=The MRL for 1,2-D€bromD-3-chloropropane has been increased due to the presence of an interfering compound.
<br /> 16=Sample was re-analyzed to confirm the presence of compounds that were detected in the first analysis. 98=Repeat analysis by Modred Method EPA 8015 yielded inconsistent results. The concentrations appear to vary.
<br /> 1e=Samples were collected by Wallace Kuhl for Unocal:LlncolnflNeber. 49=Ma€rix SpikelMatrix Spike Duplicate results for Chlorobenzene were outside of control limits. This may indicate a bias
<br /> Z°=The method reporting limit for Styrene was raised,due to the presence of an interfering compound. for the sample that was spiked.
<br /> "=1,4-Dichlorobenzene detected at 1.2 ugfL. 1S°=Matrix SpikelMatrix Spike Duplicate results were outside of control limits. This may indicate a bias for the sample that was spiked.
<br /> rx=Styrene detected at 2.9 ugfL. 6i=Matrix SpikelMatrix Spike Duplicate results were affected by the analyte concentrations already present in the un-spiked sample.
<br /> 23=1,1,2-Trichtoroethane detected at 2.7 ug)L, 53=Wallace-Kuhl did not sample due to ongoing negotiations with the City and the Regional Board.
<br /> 24=Bromodichloromethane detected at 0.70 ugfL. Bromodichloromethane at 1.2 ugfL.
<br /> 26=Chloroform detected at 8.6 ugfL,Bromodichloromethane detected at 7.0 ugfL s'=Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo.
<br /> ze=Bromodichloromethane detected at 4.00097 M94 The method reporting limit for Bromodichloromethane was raised,due to the presence of an interfering compound.
<br /> f,. 27=The method reporting limit for TCE was raised,due to the presence of an interfering compound. 5G=The method reporting limit for Chioromo€hane,1,1,2-TCA and 1,1,2,2-Tetrachloroethane was raised,due to the presence of an interfering compound.
<br /> se=The method reporting limit for DIPE was raised,due to the presence of an interfering compound. 6°=Chloroform detected at 2.2 ugfL.
<br /> =The method reporting limit for 1,3,5-Trimethylbenzene was raised,due to the presence of an interfering compound 6' internal Standard recovery by EPA Method 826013 was above laboratory control limits.This may indicate a bias in the analysis due to the sample's
<br /> 'a=Ma€rix SpikelMairix 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 anslyles associated with the failing internal standard are likely
<br /> Since€he LCS recoveries were within control limits,no data are flagged. biased.These compounds were not detected above the Method Reporting Limit.
<br /> )
<br /> Stantec Page 46 of 46
<br /> 20120924-Parcel2A(Tables 4,5,6,7)€istorical GW Tables 3012-CL.xtsx
<br />
|