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Table 7 <br /> Recent Groundwater Oxygenate and Fuel Additive Analytical Data <br /> Stockton Terminals Technical Committee <br /> Port of Stockton <br /> Stockton, California <br /> Sample Sample MTBE DIPE ETBE TAME TBA Methanol Ethanol <br /> Identification Date (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) Comments <br /> QCEB-2 08/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCEB-3 08/06/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCEB-1 11/03/09 <0.50 <0.50 <0.50 <0.50 <5.0 140 <50 <br /> QCEB-2 11/02/09 <0.50 <0.50 <0.50 <0.50 <5.0 69 <50 <br /> QCEB-3 11/05/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCEB-1 02/03/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCEB-2 02/02/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCEB-3 02/02/10 <0.50 <0.50 <0.50 <0.50 <5.0 56 <50 <br /> QCTB-1 05/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-2 05/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-3 05/05/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-1 08/03/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-2 08/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-3 08/06/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-1 11/02/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-2 11/02/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-3 11/03/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-1 02/01/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-2 02/02/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> QCTB-3 02/02/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 <br /> Notes: Contents of this table are a subset of Appendix I. <br /> MTBE =Methyl tertiary butyl ether,analyzed by EPA Method 8260B. =Not sampled/Not analyzed <br /> DIPE =Di-isopropyl ether,analyzed by EPA Method 82608. NR =Not required <br /> ETBE =Ethyl tertiary butyl ether,analyzed by EPA Method 82608. SA(1,3) =Sampled semiannually during first and third quarters <br /> TAME =Tertiary amyl methyl ether,analyzed by EPA Method 82608. pg/L =Micrograms per liter. <br /> TBA =Tertiary butyl alcohol,analyzed by EPA Method 82608. QCDup =Duplicate sample <br /> Methanol =Analyzed by EPA Method 82608. QCEB =Equipment Blank <br /> Ethanol =Analyzed by EPA Method 82608. QCTB =Trip Blank <br /> =The method reporting limit has been increased due to the presence of an interfering compound. <br /> 2 =Samples were analyzed by EPA Method 8260B using bottles that contained headspace bubbles greater than 1/4 inch in diameter. <br /> 3 =Sample foamed during the purging procedure. Results for this sample should be used with caution. <br /> '=Repeat analysis by method 8260B yielded inconsistent results. Highest valid concentrations reported. <br /> 5=Grab Sample. <br /> 1 Q1 0 STTC gwtables.xlsx Page 14 of 14 <br />