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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-%00 FAX(650)364`9233,, *� <br /> 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(92 5)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342, <br /> 1551 Industrial Road San Carlos, CA 94070 4111 (650)232-9600 FAX(650)232-9612 <br /> Blame Tech Services Client Project ID Shell 620 W Charter Way <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9902875-01-07,09,10 Reported Mar 3 1999 <br /> QUALITY CONTROL DATA-REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst TLP <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GCO22599BTEX30A <br /> Sample No GW9902890-05 <br /> Date Prepared 2125199 2/25/99 2125199 2125199 <br /> Date Analyzed 2125199 2/25199 2/25199 2/25199 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Conc , ug/L N D N D N D N D <br /> Conc Spiked, ug/L. 10 10 10 30 <br /> Matrix Spike, ug/L. 93 8 8 87 26 <br /> %Recovery 93 88 87 88 <br /> Matrix • <br /> pike Duplicate, ug/L 92 87 86 26 <br /> % Recovery 92 87 86 87 <br /> elative%Difference 1 1�1 1-1-2 1-1 - <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GCO22599BTEX30A <br /> Date Prepared 2125/99 2125/99 2/25/99 2/25199 <br /> Date Analyzed 2125199 2/25199 2125/99 2/25199 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 100 97 95 29 <br /> LCS %Recovery 1000 97 95 95 <br /> Percent Recovery Control Limits <br /> NISIMSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known tnterferenl free matnx that is analyzed using the same reagents • <br /> SEQUOI A LYTICAL 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 wrthin specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> regory <br /> lect Manager <br />