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ls3 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 q <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 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 /> 1551 Industrial Road San Carlos,CA 94970-4111 (650)232-9600 FAX(650)232-9612 <br /> 1. <br /> Blaine Tech Services Client Project ID Shell 341 East Main St Ripon <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 _ _ _ ° <br /> Attention Francis Thie QC Sample Group 9902D76-01 Reported Mar 11, 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# GC030899BTEX30A <br /> Sample No GW9902C56-06 <br /> Date Prepared 318199 318199 318199 318199 <br /> Date Analyzed 318199 316199 3/8199 318199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 96 92 9 1 27 <br /> % Recovery 96 92 91 91 <br /> Matrix <br /> Spike Duplicate, uglL 94 91 9 0 27 <br /> % Recovery 94 91 90 90 <br /> Relative % Difference 21 1 1 1 1 1 1 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC030899BTEX30A <br /> Date Prepared 3/8199 3/6199 3/8/99 318/99 <br /> Date Analyzed 3/8199 3/8199 318/99 318199 <br /> Instrument I D# GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 96 95 95 29 <br /> LCS % Recovery 96 95 95 95 <br /> Percent Recovery Control Limits <br /> MS/MSD 60-140 60.140 60140 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,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 /> i the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Kayvap: im �� interference,the LCS recoveryis to be used to validate the batch <br /> ya� <br /> Project Manager <br />