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Sequoia 680 Chesapeake brave Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94596 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-010 0 <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 Olablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting QC Sample Group 9811D70-11,15-19 Reported Dec 3 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst AM <br /> tANALYTE Gasolsne <br /> QC Batch # GC112798BTEX17A <br />' Sample No GW9811F45-01 <br /> Date Prepared 11/26/98 <br /> Date Analyzed 11/26/98 <br />' Instrument I D# GCHP17 <br /> Sample Conc ug/L N D <br /> Conc Spiked, ug/L 250 <br /> rMatrix Spike ug/L 240 <br /> % Recovery 97 <br /> Matrix <br /> Spike Duplicate, ug/L 240 <br /> % Recovery 96 <br />' Relative % Difference 1 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC112798BTEX17A <br />' Date Prepared 11/27/98 <br /> Date Analyzed 11/27/98 <br /> Instrument 1 D # GCHP17 <br />' Conc Spiked ug/L 250 <br /> LCS Recovery, ug/L 240 <br />' LCS % Recovery 97 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br />' LCS 7090 <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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Rebecca Strait <br /> Project Manager <br />