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Sequoia 680 CheWisapeake Drive Redwood Ciry CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N get Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker 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 Science & Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste 6100 <br /> Lafayette, CA 94549 <br /> Attention Chnsta Martmg QC Sample Group 9811D71-20 Reported Dec 3 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC120298BTEX17A <br /> Sample No <br /> Date Prepared 1212198 12/2198 1212198 12/2/98 <br /> Date Analyzed 1212198 1212/98 12/2198 1212/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Sample Conc ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 9 6 9 4 9 8 27 <br /> % Recovery 96 94 98 90 <br /> Matrix <br /> Spike Duplicate, ug/L 9 6 9 5 9 7 28 <br /> % Recovery 96 95 97 93 <br /> Relative % Difference 0 0 1 1 1 0 3 3 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC120296BTEX17A <br /> Date Prepared 1212198 1212/98 1212198 1212/98 <br /> Date Analyzed 1212198 1212/98 12/2/98 1212198 <br /> Instrument 1 D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 3 9 0 94 27 <br /> LCS % Recovery 93 90 94 90 <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 /> ` ? w� the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> l interference the LCS recovery is to be used to validate the batch <br /> Rebecca Strait <br /> Project Manager <br />