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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 79Z 1865 FAX(707)792 0,142 <br />' EA Engineering Client Project ID Exxon 7-0137 5150137 1300 <br /> 3468 Mt Diablo Blvd, Ste 8100 <br /> Lafayette, CA 94549 <br /> Attention Christa Marting OC Sample Group 9807DO8-09,10 Reported Aug 3 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8020 <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br />' QC Batch # GC072898BTEX02A <br /> Sample No GW9807893-02 <br /> Date Prepared 7128198 7128198 7/28198 7/28198 <br />' Date Analyzed 7128198 7128198 7128198 7128198 <br /> Instrument 1 D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 10 31 <br /> % Recovery 110 110 100 103 <br /> Matrix <br /> Spike Duplicate, ug1L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> Relative % Difference 00 0 0 9 5 6 6 <br />' RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK072898AS <br /> Date Prepared 7/28198 7128/98 7/28198 7128/98 <br /> Date Analyzed 7128198 7128/98 7128198 7/28/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> LCS Recovery ug/L 11 10 10 31 <br /> LCS % Recovery 110 100 100 103 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br />' The LCS is a control sample of known Interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Richard Herling <br /> Project Manager <br />