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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Ift"Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-Ot00 <br /> a- ) <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)79z-0342 <br /> EA Engineering Science & Tech Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> Attention Matt Derby QC Sample Group 9901089-01-03 Reported Feb 3 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xyienes <br /> QC Batch # GCO13099BTEX30A <br /> Sample No GW9901 E36-09 <br /> Date Prepared 1130199 1130199 1/30/99 1130199 <br /> Date Analyzed 1130199 1130199 1/30/99 1130199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone , ug/L N D N D N D N D <br /> Conc Spiked ug/L 10 10 10 30 <br /> i <br /> Matlax Spike, ug/L 9 4 9 4 9 1 28 <br /> % Recovery 94 94 91 93 <br /> Matrix <br /> Spike Duplicate, uglL 9 4 9 3 89 27 <br /> % Recovery 94 93 89 90 <br /> II <br /> Relative % Difference 0 0 1 1 2 2 3 3 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GCO130998TEX30A <br /> Date Prepared 1/30Y99 1130/99 1130/99 1130199 <br /> Date Analyzed 1/30/99 1130199 1130/99 1130/99 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 9 3 9 3 91 28 t <br /> LCS % Recovery 93 93 91 93 <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 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 /> Ronald M Chew <br /> Project Manager <br />