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1 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> r ' { Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br />' ��•,� <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 /> glow EA ENGINEERING Client Project ID EXXON 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br />' Attention Chrlsta Marting QC Sample Group 981OC43 Reported Nov 3, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br />' Analyst MM/GR <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br />' QC Batch # GC102298BTEX02A <br /> Sample No GW9810714-5 <br /> Date Prepared 10/22/98 10/22/98 10/22/98 10/22/98 <br />' Date Analyzed 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <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 9 5 98 10 30 <br /> % Recovery 95 98 103 102 <br /> Matrix <br /> Spike Duplicate, ug/L 9 7 9 9 10 31 <br /> % Recovery 97 99 104 103 <br />' Relative % Difference 2 1 1 0 0 97 <br /> 0 98 <br />' RPD Control Limits 0-25 0-25 0-25 0-25 <br />' LCS Batch# GWLCS102298A <br /> Date Prepared 10/22/98 10/22/98 10/22/98 10/22/98 <br /> Date Analyzed 10/22/98 10/22/98 10/22/98 10/22/98 <br /> I Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 94 9 6 10 30 <br /> LCS % Recovery 94 96 101 100 <br /> Percent Recovery Control Limits <br />' E- M$/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70-130 70-130 <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 rnterferent 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 limits due to matrix <br /> Wei Mei Shin interference the LCS recoveryis to be used to validate the batch <br /> Mei Mel Shin <br /> Project Manager <br /> I I <br /> I <br />