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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(92S)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9ZI-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA ENGINEERING Client Project ID EXXON 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br />' Attention ChriSta Marting QC Sample Group 981 OC43 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 # GC102298BTEX17A <br /> Sample No GW9810714-4 <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 # GCHP17 GCHP17 GCHP17 GCHP17 <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, ug/L 11 11 11 30 <br /> % Recovery 110 106 110 102 <br /> Matrix <br /> Spike Duplicate, ug/L 11 10 11 30 <br /> % Recovery 108 105 108 99 <br />' Relative % Difference 1 8 095 1 $ <br /> 30 <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 /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> I LCS Recovery ug/L 11 11 11 31 <br /> LCS % Recovery ill 108 112 104 <br /> Percent Recovery Control Limits <br /> I MS/MSD 60140 60140 60-140 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 some reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix sp ke is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 4,XXR <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Mei Mer Shin interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br />