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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)988 9673 <br /> Analytical 8t9 Straker Avenue Suite 8 Sacramento CA 95834 (916)92t-9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792 1865 FAX(707)792 0342 i <br />' EA ENGINEERING Client Project ID EXXON 7-3942 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste 8100 <br /> Lafayette, CA 94549 <br />' Attention Christa Marting QC Sample Group 9808C97 Reported Sep 24, 1998 <br /> QUALITY CONTROL DATA REPORT > <br />' Matrix Liquid <br /> Method EPA 8020 <br /> Analyst A Miraftab <br />' ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC080198BTEX21A <br /> Sample No GW98087-D09-03DMS f <br /> Date Prepared 8/1198 811198 8/1/98 811198 r <br /> Date Analyzed 811198 8/11/98 8/1/98 811198 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> r <br /> Sample Conc ug/L N D N D N D <br /> ND i <br /> Conc Spiked, ug/L 10 10 10 30 z <br /> t <br /> Matrix Spike, ug/L. 12 12 11 34 <br /> % Recovery 120 120 110 113 <br /> I <br /> Matrix <br /> *Pjke Duplicate ug/L 12 12 1 1 35 x <br /> % Recovery 120 120 110 1 1 7 <br /> Relative % Difference 00 00 00 3 5 <br /> 4 <br /> RPD Control Limits 0-25 0-25 0 25 0-25 <br /> i <br /> LCS Batch# GWLCSOBO198A <br /> Date Prepared 811/98 8/1/98 8/1198 811198 <br /> Date Analyzed 8/1198 8/1/98 8/1/98 8/1/98 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 11 1 1 11 33 <br /> LCS % Recovery 110 110 110 110 <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 ALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specif 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 /> Mei Mei Shin interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br />