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1 <br /> Sequoia <br /> r� 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> S a 404 N Wlget 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 1071 N Main St <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9810727-02-03 Reported Oct 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8010/8020 6011602 <br /> Analyst L Kim <br /> ANALYTE 1,1-DCE TCE Chlorobenzene <br /> QC Batch# GC1015980VOA29A <br /> Sample No 9810574-01 <br /> Date Prepared 10/14/98 10/14/98 10/14/98 <br /> Date Analyzed 10/14/98 10/14/98 10/14/98 <br /> Instrument[D# gchp29 gchp29 gchp29 <br /> Sample Conc ,ug/L N D 06 N D <br /> Conc Spiked,ug/L 25 25 25 <br /> Matrix Spike, ug/L 25 22 27 <br /> % Recovery 1000 86 108 <br /> Matrix <br /> pike Duplicate, ug/L 25 23 20 <br /> %Recovery 1000 90 80 <br /> elative% Difference 00 45 30 <br /> RPD Control Limits 0-50 0-50 0-50 <br /> LCS Batch# LCS101598A <br /> Date P re pa red 10/15/98 10/15/98 10/15/98 <br /> Date Analyzed 10/15/98 10/15/98 10/15/98 <br /> Instrument I D# gchp29 gchp29 gchp29 <br /> Conc Spiked, ug/L 25 25 25 <br /> Recovery, ug/L 28 21 22 <br /> LCS% Recovery 112 84 88 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 60-140 60-140 <br /> LCS 65-135 70-130 70-130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> ZectThe CS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> ANALYTICAL oration 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 fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> nner <br /> anager <br />