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1 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> ■ ,i q 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 <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 QC Sample Group 9807DO8-03,06 Reported Aug 3 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8020 <br /> Analyst G Peshlna <br />' ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC0728986TEX22A <br /> Sample No GW9807852-1 <br /> Date Prepared 7128198 7128198 7128/98 7/28/98 <br /> Date Analyzed 7128/98 7128/98 7128198 7128198 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Sample Cone ug/L N D N D N D N D <br /> Cone Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 10 10 10 32 <br /> % Recovery 100 100 100 107 <br /> Matrix <br /> Spike Duplicate, ug/L 10 10 10 31 <br /> % Recovery 100 100 100 103 <br /> Relative % Difference 00 00 0 0 3 8 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK072898A <br /> Date Prepared 7128/98 7128/98 7128/98 7128/98 <br /> Date Analyzed 7128/98 7128198 7/28198 7128198 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br />' Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 10 10 10 32 <br /> LCS % Recovery 100 100 100 107 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70 130 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 spoke is an aliquot of sample <br /> fortified with known quantities or 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Richard Herling <br /> Project Manager <br />