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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)488-9673* <br /> a- Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 141 N El Dorado <br /> 1680 Rogers Ave Matrix Liquid <br /> "San Jose, CA 95112 <br /> Attention Fran Thle Work Order# 9807H79-02-13 Reported Aug 17, 1998 <br /> QUALITY=CONTROL—DATA=REPORT— <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GC080698802005A GG080698802005A GCO80698802005A GCO80698802005A GC080698802005A <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 D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD # 8072173 8072173 8072173 8072173 8072173 <br /> Sample Conc. N D ND ND N D N D <br /> Prepared Date: 8/6/98 8/6/98 8/6/98 8/6/98 8/6/98 <br /> Analyzed Date 8/6/98 8/6/98 8/6/98 8/6/98 8/6/98 <br /> Instrument LD # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20Erg/L 20pg/L 20Ng/L 60ftg/L 210frg/L <br /> Result. 19 20 20 61 220 <br /> MS % Recovery 95 100 100 102 105 <br /> ❑up Result 17 18 18 56 250 <br /> MSD % Recov .. 85 90 90 93 119 <br /> RPD 111 105 105 85 128 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS080698 LC8080698 LCS080698 LCS080698 LCS080698 <br /> Prepared Date. 8/6/98 8/6/98 8/6/98 8/6/98 8/6/98 <br /> Analyzed-Date• 8/6/98 8/6/9a 8/6/98 8/6/98 8/6/98 <br /> Instrument LD # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20 Ng/L 20 ftg/L 20 Ng/L 60pg/L 210 fig/L <br /> LCS Result 19 19 19 58 300 <br /> LCS % Recov 95 95 95 97 143 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60-140 <br /> Control Limits <br /> Please Note <br /> SE IA NALYTICAL The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> p 1271 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 <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 /> eg nner <br /> o ct Manager **MS=Matrix Spike, MSD=MS Duplicate, RPO=Relative% Difference 98071-179 BLA <2> <br />