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t680 Chesapeake Dnve Redwood City C# 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Sequoia 404 IN Wiget Lane Walnut Creek CA 94593 (510) 988 9600 FAX(510) 988 9673 <br /> Avenue sure 8 Sacramento ea 95934 (916) 92t 96x0 FAX(9[6) 921 0160 <br /> Analytical 319 Stnker <br />' E A Engineering Science &Tech Client Project ID Exxon 7-3942 /51539421307 <br /> 9 9 1 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Maria Guensler Work Order# 9604E22 01, 10-11, 14-19 Reported May 13, 1996 <br /> 9604E23 20 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br />' Benzene <br /> QC Batch# GC042496BTEX20A GC042496BTEX20A GCO42496BTEX20A GC042496BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD # 950485903 950485903 950485903 950465903 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date 4/24/96 4/24/96 4/24/96 4/24/96 <br />' Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10Ng/L 10pg/L 10,ug/L 30pg/L <br /> Result 98 96 94 28 <br /> MS % Recovery 98 96 94 93 <br /> Dup Result 99 98 98 28 <br /> MSD % Recov .. 99 98 98 93 <br />' RPD, 10 21 42 00 <br /> RPD Limit 0-25 0.25 0-25 0.25 <br /> LCS# BLKG42496 BLK042496 BLK042496 BLK042496 <br /> Prepared Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Analyzed Date 4/24/96 4/24/96 4/24/96 4/24/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc. Spiked 10yg/L 10ug/L 10Ng/L 30ug/L <br /> LCS Result 97 9 4 97 29 <br />' LCS % Recov 97 94 97 97 <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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> 11 /� <br /> JZ <br /> fortified with known quantities of specific cunds and subjected to the entire analytical procedure if <br /> Lr _^ r therecovery of analytes from the matrix sesnotfallwlthm specified control limits titre to matrix <br /> V"` U interference,the LCS recavery is to be usal.date the batch <br /> Kevin Follett <br /> Project Manager "MS=Matrix Spike, MSD=MS Duplicate, RPD-Relative%Difference 9604E22 EEE <3> <br />