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' Sequoia 680 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Cane Walnut Creek CA 94598 (510) 988 9600 FAX 1510) 988 9673 <br /> Analytical 819 Straker 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# 9508.117 -01-02, 08-10 Reported Sep 5, 1995 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch#. GCO82995BTEX07A GCO82995BTEX07A GCO82995BTEX07A GCO82995BTEX07A <br /> Analy 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 #• 950BD7403 9W8D7403 9508D7403 9508D7403 <br /> Sample Conc : N D N D N D N C <br /> Prepared Date 8/29/95 6/29/95 8/29/95 8/29/95 <br /> Analyzed Date. 8/29/95 8/29/95 8/29/95 9/29/95 <br /> Instrument I D #: GCHP7 GCHP7 GCHP7 GCHP7 <br />' Conc Spiked- 10pg/L 10pg/L 10M9/L 30pg/L <br /> Result- 10 99 10 30 <br /> wS % Recovery. loo 99 100 100 <br /> Dup Result: 10 10 10 31 <br /> MSD % Recov . 100 100 100 103 <br /> RPD. 00 10 00 33 <br /> RPD Limit 0-50 0.50 0-50 0-50 <br /> LCS #: - - <br />' Prepared Date ' <br /> Analyzed Date. - - - <br />' Instrument 1 D #. <br /> Conc Spiked: <br /> LCS Result - <br />' LCS% Recov : - - - <br />' MS/MSD <br /> LCS 71-133 72128 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 /> SE A ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> i fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> j the recovery of analytes from the matrix spike does not fall within specified controi limits due to matrix <br /> I,= interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manager "MS=Matrix Spike MSD=MS Duplicate RPD=Relative%Difference 9508J17 EEE <1> <br />