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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)968-9600 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)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 B100 <br /> Lafayette, CA 94549 <br /> Attention Christa Marting QC Sample Group 9811 D70-07 08,12-14 Reported Dec 3 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst FLP <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC112998BTEX02A <br /> Sample No GW9811 E85-05 <br /> Date Prepared 11/29/98 11/29/98 11/29198 11/29/98 <br /> Date Analyzed 11/29/98 11/29/98 11/29/98 111291911 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <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 ug1L 11 11 11 33 <br /> % Recovery 108 108 109 109 <br /> Matrix <br /> Spike Duplicate, uglL 11 11 11 32 <br /> % Recovery 107 107 107 108 <br /> Relative % Difference 093 0 93 1 9 092 <br /> RPD Control Limits 025 0-25 0 25 0-25 <br /> LCS Batch# GC112998BTEX02A <br /> Date Prepared 11/29/98 11/29/98 11/29/98 11/29/98 <br /> Date Analyzed 11129/98 11/29/98 1 1129/98 11/29/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 11 11 11 34 <br /> LCS % Recovery 112 112 114 112 <br /> Percent Recovery Control Limits <br /> MS/MSD 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 It <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 /> Rebecca Strait <br /> Project Manager <br /> 1 Od <br />