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Sequoia �0 Chesapeake'e'* Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Mllget Lane Walnut Creek.CA 94598 (925)98$-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite B Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> qC0 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 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste 8100 <br /> Lafayette, CA 94549 <br /> Attention Matt Derby QC Sample Group 9901089-04 Reported Feb 3, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC012899BTEX06A <br /> Sample No GW9901089-01 <br /> Date Prepared 1/28/99 1/28199 1128199 1128/99 <br /> Date Analyzed 1128/99 1128199 1128/99 1128199 <br /> Instrument I D# GCHP06 GCHP06 GCHP06 GCHP06 <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 88 7 8 7 8 23 <br /> % Recovery 68 78 78 77 <br /> Matrix <br /> Spike Duplicate, uglt 8 9 7 9 78 23 <br /> % Recovery 89 79 78 77 <br /> Relative % Difference 1 1 1 3 00 0 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC0128996TEX06A <br /> Date Prepared 1128199 1/28199 1128199 1128199 <br /> Date Analyzed 1/28/99 1128199 1/28/99 1/28/99 <br /> Instrument I D # GCHP06 GCHP06 GCHP06 GCHP06 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 5 9 0 8 9 27 t <br /> LCS % Recovery 95 90 89 90 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> F- 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 matnx 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 enure 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 /> Ran d M Chew <br /> Project Manager <br />