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Appendix I <br /> Historical 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 1,2-DCA EDB <br /> Identification Date (pg/L) (pg/L) (tag/L) (pg/L) (tag/L) (tag/L) (tag/L) (pg/L) (pg/L) Comments <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 /> QCT13-1 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: <br /> MTBE =Methyl tertiary butyl ether,analyzed by EPA Method 8260B. =Not sampled/Not analyzed <br /> DIPE =Di-isopropyl ether,analyzed by EPA Method 8260B. 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. A(1) =Sampled annually during first quarter <br /> TBA =Tertiary butyl alcohol,analyzed by EPA Method 82608. A(3) =Sampled annually during third quarter <br /> Methanol =Analyzed by EPA Method 8015B or 8260B. pg/L =Micrograms per liter. <br /> Ethanol =Analyzed by EPA Method 82608. QCDup =Duplicate sample <br /> 1,2-DCA = 1,2-Dichloroethane,analyzed by EPA Method 82608. QCEB =Equipment Blank <br /> EDB = 1,2-Dibromoethane,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 /> 4=Repeat analysis by method 8260B yielded inconsistent results. Highest valid concentrations reported. <br /> 5=Grab Sample. <br /> 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 <br /> analysis. The laboratory considers this conversion effect to be mathmatically significant in samples that contain MTBE/TBA in ratios of over 20 to 1. <br /> 1 Q10 STTC gwtables.xlsx Page 77 of 77 <br />