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' Sequoia 689 Chesapeake Dnve 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 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 1 <br />' E A Engineering'Science&Tech Client Project ID Exxon 7-0137 / 5150137 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Martmg Work Order# 9701 A73 01-02, 07, 09 Reported Jan 31, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> CSC Batch# GCO12397BTEX21A GCO12397BTEX21A GCO12397BTEX21A GCO12397BTEX21A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br />' Analyst G Fish G Fish G Fish G Fish <br /> M S/MSD # 970145104 970145104 970145104 970145104 <br /> Sample Conc N D N D N o N D <br /> Prepared Date 1/20/97 1/20/97 1/20/97 1/20/97 <br /> Analyzed Date 1/20/97 1/20/97 1/20/97 1/20/97 <br /> Instrument 1 D # GCHF21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10Pg/L 10ug/L 10pg/L 30Ng/L <br /> Result 11 10 10 32 <br /> MS % Recovery 110 100 100 107 <br /> Dup Result 10 10 10 31 <br /> MSD % Recov 100 100 100 103 <br /> RPD 95 00 00 32 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LIDS # BLK012397A BLK012397A BLK012397A BLK012397A <br /> Prepared Date 1/20/97 1/20/97 1/20/97 1/20/97 <br /> Analyzed Date 1/20/97 1/20/97 1/20/97 1/20/97 <br /> Instrument I D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone Spiked 10yg/L 10yg/L 10Ng/L 30Erg/L <br /> LCS Result 10 10 10 32 <br /> LCS % Recov 100 100 100 107 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <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 /> UO A 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 /> even Follett <br />' Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative %Difference 9701A73 EEE <1> <br />