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Table 5 Groundwater Oxygenate and Fuel Additive Analytical Data First Quarter 2006 • Stockton Terminals Technical Committee Port of Stockton Stockton, California Sample Water Sample Ethanol TBA MTBE DIPE EtBE TAME 1,2-DCA EDB Methanol Identification Zone Date (ug/L) (ug/L) (ug/L) (ug/y (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) TIME OIL TO1MW-1 A 02/06/06 Well Flooded TOrr-1 A 02/06/06 <200 310 J 8,900 <20 <20 <20 - - <8,000 ' TONT-2 A 02/06/06 <250 820 13,000 <25 <25 73 - - <10,000 ' TO/T-8 A 02/06/06 - 72 72 <5.0 <5.0 <5.0 - - - TOIR-1 A 02106106 <50 <20 12 <4.0 0.0 <4.0 - - <400 TOIR-2 A 02/06106 Well Flooded TOIR-3 A 02106/06 <50 27 6.3 <5.0 <5.0 <5.0 - - <500 TOIR-5 A 02/06/06 Well Flooded TOACAM B 02/06/06 <50 <5.0 1.2 <0.50 <0.50 <0.50 - - <50 TOIWCAC C 02/06/06 - - <0.50 - - - - - - TO/WC-2B B 02106106 <200 140 42 <20 <20 <20 - - <2,000 TOIWC-2D D 02106106 - - 1.2 - - - - - - TESORO TS-1 A 02/07/06 - - 100 - - - - - - TS-4 A 02/07/06 <150 <70 180 <15 <15 <15 0,500 TS-5 A 02/07/06 <5.0 <5.0 1.5 <0.50 <0.50 <0.50 - - <50 TS-7 A 02/07/06 - <5.0 <0.90 <0.90 <0.90 <0.90 - - <90 TS-8 A 02/07106 - <60 <10 <10 <10 <10 - - <1,000 TS-9 A 02/07106 - - <0.50 - - - - TS-10 A 02107106 <5.0 <5.0 2.6 - - - - - - TS-11 A 02/07106 - <5.0 <0.50 TS/M-1 A 02107106 - 8.6 28 - - - - - - TS/M-2 A 02107/06 <150 <70 16 <15 <15 <15 <1,500 TS/MW-1A A 02/07/06 - 28 23 <0.50 <0.50 <0.50 - - - TS/M W-1 B B 02/07/06 - 950 120 <3.0 <3.0 <3.0 - - <300 TS/MW-1C C 02/07/06 - <5.0 <0.50 <0.50 <0.50 <0.50 - - - TSIMW-1D D 02/07106 - 14 2.6 - - - - - - TS/MW-2D D 02/08/06 <50 920 19 <5.0 <5.0 <5.0 - - <500 QCDUP3 2/612006 <50 <5.0 0.71 <0.50 <0.50 <0.50 - - <50 Explanations: uglL=Micrograms per liter. TBA=Tert-butyl alcohol,analyzed by EPA Method 8260B. MtBE=Methyl tert-butyl ether,analyzed by EPA Method 82608. DIPE=Di-isopropyl ether,analyzed by EPA Method 82609. ELBE=Ethyl tart-butyl ether,analyzed by EPA Method 8260B. TAME=Tert-amyl methyl ether,analyzed by EPA Method 82608. 1,2-DCA=1,2-Dichloroethane,analyzed by EPA Method 82608. EDB=1,2-Dibromoethane,analyzed by EPA Method 82608. Ethanol=Analyzed by EPA Method 82608. Methanol=Analyzed by EPA Method 8015B. -=Not sampled/Not analyzed MRP= California Regional Water Quality Control Board-Central Valley Region's Monitoring and Reporting Program No.R5-2004-0823 QCDUPI=Duplicate Sample of ARIMW-11C QCDUP2=Duplicate Sample of TS-11 QCDUP3=Duplicate Sample of TO/TI QCEB=Equipment Blank QCTB=Trip Blank •=The method reporting limit has been increased due to the presence of an interfering compound. 2=Matrix Spike/Matrix Spike Duplicate Results were affected by the analyte concentrations already present in the un-spiked sample. J=TBA results may be biased slightly high and are flagged with a'J'. A fraction of MtBE(typically less than 1%)converts to TBA during the analysis of water samples. The lab considers this conversion effect to be mathematically significant in samples that contain MtBE1TBA in rations of over 20:1. IASTTC1Tab1es12005 QMRVQ05101Q06 STTC gwtables.xlslTable 5(oxy's) Page 2 of 2