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Sequoia 680 Chesapeake Drive 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 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Blame Tech Services, Inc Client Project ID Shell, Stockton/960820-K1 <br /> 985 Timothy Drive Matrix Liquid <br /> ,San Jose, CA 95133 <br /> Attention Fran Thie Work Order# 9608E66-02 Reported Sep 10, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC0830968TEX02A GC083MBTEX02A GC0a3096BTEX02A GCO830966TEX02A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: D Jtrsa D Jasa D Jirsa D Jirsa <br /> MS/MSD# 9608E7604 9608E7604 9608E7604 96ME7604 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date: 8/30/96 8/30/96 8/30/96 8/30/96 <br /> Analyzed Date. 8/30/96 8/30/96 9/300/96 8/30/96 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked: 10 fug/L long/L 10ug/L 30 fug/L <br /> Result- 99 95 93 27 <br /> MS % Recovery 99 95 93 90 <br /> Dup Result: 99 93 94 27 <br /> MSD %Recov.: 99 93 94 90 <br /> RPD 00 21 11 00 <br /> RPD Limit 0-25 0.25 0.25 0-25 <br /> LCS # BLK083096 BLK083096 BLK083096 BLK083096 <br /> Prepared Date: 8/30/96 8/30/96 8/30/96 8/30/96 <br /> Analyzed Date: 8/30/96 8/30/96 8/30/96 8/30/96 <br /> Instrument I.D.#- GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc. Spiked: 10ug/L 10 fug/L 10 fug/L 30 fug/L <br /> LCS Result 9 3 90 85 23 <br /> LCS %Recov. 93 90 85 77 <br /> MS/MSD— 60-140 60-140 6D-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> IPerThe LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> 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 /> en <br /> anager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9608E66 6LA <2> <br />