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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> P7 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z 5)988-9673 <br /> Analytical <br /> �+ <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)925-9600 FAC(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 1013lalne Tech Services, Inch Client Project ID Shell 1071 N Main St v <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 98071-185-01-04 Reported Aug 19, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPN <br /> Benzene <br /> OC Batch# G0080698802005A GCO80698802005A GCO80698802005A GC080698802005A GCO80698802005A <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# 8071974 8071974 8071974 8071974 8071974 <br /> Sample Conc N D N D 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 I D#: HP5 HP5 HP5 HP5 HP5 <br /> Conc. Spiked 20 pg/L 20 ug/L 20 ug/L 60 ug/L 210 erg/L <br /> Result 18 19 19 60 220 <br /> MS %Recovery 90 95 95 100 105 <br /> Dup, Result 19 20 21 64 210 <br />. MSD % Recov. 95 100 105 107 100 <br /> RPD: 54 51 10 65 47 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCs# LOS080598 LCS080598 LCS080598 LCS080598 LCS080598 <br /> Prepared Date: 8/5/98 8/5/98 8/5/98 8/5/98 8/5/98 <br /> Analyzed Date. 8/5/98 8/5/98 8/5/98 8/5/98 8/5/98 <br /> Instrument I D.# HP5 HP5 HP5 HP5 HP5 <br /> Conc. Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L 210 ug/L <br /> LCS Result. 17 18 18 57 220 <br /> LCS%Recov.. 85 90 90 95 105 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that Is analyzed using the same reagents, <br /> Elap 127 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 /> low Peg y Pe ner <br /> Prrofloct Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 98071-185 BLA <4> <br />