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Sequoia 63C Cnesapeake Dnv: R:d,ccd C ry CA 94063 (4 15) 3o, 9oG0 FAX(415) 364 9233 <br /> 404 N \Yiige, Lane walnut Creek CZ 94 93 1510) 933 96CQ FAX (510) 938 9,5773 <br /> Analytical gig St l—Avenue Suite 3 Sacramento CA 95334 (916; 921 9600 FAX(916) 92i 0100 <br /> E A Engineering Science &Tech Client Protect ID Exxon 7-3942/8373942 1307 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 Work Order 9514F30 20 23, 26-30 Reported orted Oct 30, 1995 <br /> Attention Tracy Faulkner <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC102595STEX02A GC102595STEX02A G0102595BTEX02A GC1025956TEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst B Sullivan B Sullivan B Sullivan B Sullivan <br /> MS/MSD # 951OA0606 9510AC606 951OA0606 951OA0606 <br />' Sample Conc N D N D N D N D <br /> Prepared Date 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Analyzed Date 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10Ng/L 10 fig/L 10>!g/L 30 lig/L <br /> Result 99 97 99 29 <br /> MS % Recovery 99 97 99 97 <br /> Dup Result 10 10 10 30 <br /> MSD % Recov 100 100 100 100 <br /> RPD 10 30 10 34 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK102595 BLK102595 BLK102595 BLK102595 <br /> Prepared Date 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Analyzed Date 10/25/95 10/25/95 10/25/95 10/25/95 <br /> instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br />' Conc Spiked 10ug/L t0yg/L 10u9/L 301ug/L <br /> LCS Result 97 94 96 28 <br />' LCS % Recov 97 94 96 93 <br /> MS/MSD <br /> LCS 71133 72-128 72130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known, Interferent free matrix that Is analyzed using the same reagents <br /> S.Mg'i ;ALYTICAL 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 /> rger **MS=Matrix Spike,MSD=MS Duplicate RPD=Relattve% Difference 951OF27 EEE <4> <br />