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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364 9233 <br /> 404N Wiget Lane Walnut Creek CA 94598 (925)988 9600 FAX(92 5)988 9673 <br /> �„� Analytical 819 Sacker Avenue Suite S SAtramenro CA 95834 (916)921 9600 FAX(916)921-0100 t <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707}792 1865 FAX(707) 792 0342 ) <br /> 6 <br /> EA ENGINEERING Client Project ID EXXON 7-3942 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> Attention Chrlsta Marting QC Sample Group 9808C95 Reported Sep 24 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst NC <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO82798BTEX30A i <br /> Sample No GW9808B79-3 s` <br /> Date Prepared 8/27/98 8127198 8/27198 8/27/98 <br /> Date Analyzed 8/27198 8/27/98 8127/98 8/27/98 <br /> Instrument I D # HPGC30 HPGC30 HPGC30 HPGC30 <br /> Sample Conc ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> t <br /> Matrix Spike, ug/L 11 11 11 33 <br /> % Recovery 110 110 110 110 <br /> Matrix <br /> pike Duplicate ug/L 11 11 11 33 <br /> Recovery 110 110 110 110 <br /> Relative % Difference 0 0 0 0 <br /> 00 00 <br /> RPD Control Limits 0 25 025 025 0-25 <br /> LCS Batch# GWLCS082798A <br /> Date Prepared 8127198 8/27/98 8/27/98 8127198 <br /> Date Analyzed 8/27198 8/27/98 8/27198 8127/98 <br /> Instrument I D # HPGC30 HPGC30 HPGC30 HPGC30 <br /> Conc Spiked ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 11 11 11 33 <br /> LCS % Recovery 110 110 110 110 <br /> Percent Recovery Control Limits <br /> MESIM1SD 60140 60140 60140 60140 <br /> LCS 70 130 70 130 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 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 /> {/( f tondied with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> UX the recovery of anafytes Irom the matrix spike does not fall within specdied control limits due to matrix <br /> nwierence the LCS recovery is to be used to validate the batch <br /> el Met Shin <br /> kloject Manager <br />