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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)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 /> Blaine Tech Services Client Project ID Shell 4445 Pershing Ave <br /> 1680 Rogers Ave <br /> San Jose CA 95112 <br /> Attention Fran Thie QC Sample Group 9810126-02-05 Reported Nov 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst AM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC1108988TEX17A <br /> Sample No GW981OL33-01 <br /> Date Prepared 1118/98 11/8198 1118198 1118198 <br /> Date Analyzed 11/8198 1118/98 1118198 1118198 <br /> Instrument I D# GCHP17 GCHP17 GCHP17 GCHP17 <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 100 9 6 99 28 <br /> % Recovery 1000 96 99 93 <br /> Matrix <br /> pike Duplicate, ug/L. 100 100 100 29 <br /> % Recovery 1000 1000 1000 97 <br /> elative% Difference 00 4 1 1 0 4 2 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC1108986TEX17A <br /> Date Prepared 1118198 11/8198 11/8/98 11/8198 <br /> Date Analyzed 11/8/98 11/8/98 1118/98 11/8/98 <br /> Instrument I D# GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked, ug/L. 10 10 10 30 <br /> LCS Recovery, ug/L. 100 100 100 29 <br /> LCS % Recovery 1000 1000 1000 97 <br /> Percent Recovery Control Limits <br /> MSIMS� 60-140 60-140 60140 60-140 <br /> LCS 70-130 70-130 70130 70-130 <br /> Quality As ranee Statement All standard operating procedures and quality control requirements have been met <br /> 0 Please Nate <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQ 0 A NALYTiCAL preparation a 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 entre analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matnx <br /> interference the LCS recovery is to be used to validate the batch <br /> Peg y Pe ner <br /> Pro) t M nager <br />