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Table 5
<br />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 MtBE TBA 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 (mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)(mg/l)
<br />Explanations:
<br />1,1,2-TCA = 1,1,2-Trichloroethane TBA = Tertiary Butyl Alcohol
<br />1,1,2,2-TCA = 1,1,2,2-Tetrachloroethane TCE = Trichloroethene
<br />DCA = Dichloroethane U = Upper groundwater zone
<br />DIPE = Di-Isopropyl Ether VC = Vinyl Chloride
<br />EtBE = Ethyl tertiary Butyl Ether VOCs = Volatile Organic Compounds
<br />FD = Field Duplicate < = Below given laboratory detection limit
<br />Freon 11 = Trichlorofluoromethane --- = Not Analyzed
<br />L = Lower groundwater zone * = Other unspecified VOCs were tabulated in Treadwell & Rollo's Volume II, Site Characterization Report dated 12/13/99.
<br />mg/l = milligrams per liter
<br />MtBE = Methyl tertiary Butyl Ether
<br />ND = Not detected; laboratory detection limit unspecified in historical tables
<br />TAME = Tertiary Amyl Methyl Ether
<br />1 = 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 />4 = 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 />6 = The method reporting limit for 1,1,2,2-Tetrachloroethane was raised, due to the presence of an interfering compound.36 = The method reporting limit for Ethanol is increased due to the presence of an interfering compound.
<br />7 = Samples were collected by Clayton Group Services for Unocal: Lincoln/Weber.37 = Carbon Tetrachloride detected at 0.72 ug/L.
<br />8 = 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 />9 = 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.40 = The method reporting limit for methanol has been increased due to the presence of an interfering compound.
<br />11 = Blank Analyzed 02/19/04.41 = 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.42 = Bromoform detected at 0.51 ug/L.
<br />13 = Samples were analyzed by EPA Method 8260B using a bottle that contained a headspace bubble greater than 1/4-inch in diameter.43 = Vinyl Chloride detected at 0.60 ug/L.
<br />14 = Bromodichloromethane detected at .0031 ug/L.44 = Chloromethane detected at 0.95 ug/L.
<br />15 = Bromodichloromethane detected at .0026 ug/L.45 = Chloromethane detected at 0.87 ug/L.
<br />16 = Bromodichloromethane detected at 1.3 ug/L.46 = 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 />19 = 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 />21 = 1,4-Dichlorobenzene detected at 1.2 ug/L.50 = 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 54 = Wells destroyed in November 2008 as part of the Unocal excavation activities by Treadwell and Rollo.
<br />26 = Bromodichloromethane detected at 0.00097 mg/l 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.56 = 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
<br />30 = Matrix Spike/Matrix Spike Duplicate results were outside of control limits. This may indicate a bias for the sample that was spiked.
<br />Since the LCS recoveries were within control limits, no data are flagged.
<br />I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\20120305-Parcel2A (Tables 4,5,6,7) Historical GW Tables 1Q12-CL.xlsx Page 45 of 45
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