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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942/83739 42 <br /> 3841 N Freeway Blvd , Ste 145 Matrix Liquid <br />' Sacramento, CA 95834 <br /> Attention Kyriacous Kyriacou Work Order# 9508J 17-12, 17-18 Reported Sep 5, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch#. GCO901958TEX07A GCO90195BTEX07A GCO90195BTEX07A GC090195BTEX07A <br /> Ana ly Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD #: 95081-6402 95081-6402 9508L64o2 95081-6402 <br />' Sample Conc.: N D N D N D N D <br /> Prepared Date 9/1/95 9/1/95 9/1/95 9/1/95 <br /> Analyzed Date 9/1/95 9/1/95 9/1/95 9/1/95 <br /> Instrument 1.13 #: GCHP7 GCHP7 GCHP7 GCHP7 <br />' Cone. Spiked. 10ug/L 10,ug/L iopg/L 30u9/L <br /> Result- 12 13 12 36 <br /> WS % Recovery 120 125 120 120 <br /> Dup. Result 99 11 10 31 <br /> MSD % Recov.: 99 110 100 103 <br />' RPD. 19 13 18 15 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> LCS #. - - <br />' Prepared Date - - <br /> Analyzed Date - - <br />' Instrument I D # - - <br /> Conc Spiked <br /> LCS Result: - - <br />' LCS % Recov : - - <br />' M M D <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br />' Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> SUe y PI N YTICAL 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 40 matrix <br /> Interference the LCS recovery Is to be used to validate the batch <br />' Penner <br /> Project Manager '"MS=Matrix Spike MSD=MS Duplicate RPD=Relative%Difference 9508J17 EEE <4> <br /> w� <br />