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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92f-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> EA ENGINEERING <br /> Client Project ID EXXON 7-0137, 5150137 7 300 <br /> 3468 Mt Diablo Blvd Ste 8100 <br /> Lafayette, CA 94549 <br />' Attention Christa Marting QC Sample Group 981OC43 Reported Nov 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MMIGR <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br />' QC Batch # GC102298STEX30A <br /> Sample No GW9810714-2 <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 1 D # GCHP30 GCHP30 GCHP30 GCHP30 <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 9 9 10 10 31 <br /> % Recovery 99 101 102 102 <br /> Matrix <br /> Spoke Duplicate, ug/L 85 8 7 8 6 25 <br /> % Recovery 85 87 86 83 <br />' Relative % Difference 15 15 17 21 <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# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked, ug/L 10 10 10 30 <br />' LCS Recovery, ug/L 10 10 10 31 <br /> LCS % Recovery 100 102 102 103 <br /> Percent Recovery Control Limits <br />' MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spoke does not fall within specified control limits due to matrix <br /> Mer Mei Shin interference the LCS recoverx is to be used to validate the batch <br /> Project Manager <br /> I <br />