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' (p 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> ■"�� 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> '44 <br /> 00 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 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9801803 05 -09 Reported Feb 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC012897BTEX06A GC0128978TEX06A GCO12897BTEX06A GCO12897BTEX06A GC012897BTEXO6A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 980196703 980196703 980196703 980196703 980196703 <br />' Sample Conc N D ND N D N D NO <br /> Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked 10pg/L 10pg/L 10Yg/L 30pg/L 60,ug/L <br /> Result 13 13 13 39 62 <br /> MS % Recovery 130 130 130 130 103 <br /> MDup Result 11 11 11 34 53 <br /> MSD % Recov 110 110 110 113 88 <br /> RPD 17 17 17 14 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK012798 BLK012798 BLK012798 BLK012798 BLK012798 <br /> ' Prepared Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Analyzed Date 1/28/98 1/28/98 1/28/98 1/28/98 1/28/98 <br /> Instrument I D # GCHP6 GCHP6 GCHP6 GCHP6 GCHP6 <br /> ' Conc Spiked 10 pg/L 10 pg/L 10 pg/L 30 pg/L 60 pg/L <br /> LCS Result 13 13 13 39 61 <br /> LCS % Recov 130 130 130 130 102 <br /> 60-140 60-140 60-140 60-140 50-140 <br /> ' LCS 70-130 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 /> 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 /> Richard Hed <br /> ' Project Manage `*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9801803 EEE [4> <br />