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Sequoia 680 Chesapeake Drive Redwood CityCA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N WISet Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 4D41,E Analytiea� Big 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 /> Ine Tech Services Client Project ID Shell 141 N El Dorado <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle QC Sample Group 9807H79-10 Reported Aug 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 801018020, 6011602 <br /> Analyst C Medina <br /> ANALYTE 1,1-DCE TCE Chlorobenzene <br /> QC Batch# GC0809980VOA24A <br /> Sample No 9807138-01 <br /> Date Prepared 818198 818198 8/8198 <br /> Date Analyzed 819198 819198 819198 <br /> Instrument I D# gchp24_2 gchp24_2 gchp24_2 <br /> Sample Conc , ug/L 13 44 N D <br /> Conc Spiked, ug/L 25 25 25 <br /> Matrix Spike, ug/L 30 66 31 <br /> %Recovery 115 88 124 <br /> Matrix <br /> Qke Duplicate,uglL 28 64 29 <br /> % Recovery 107 80 116 <br /> elative% Difference 72 95 67 <br /> RPD Control Limits 0-50 0-50 0-50 <br /> LCS Batch# VWLCS080998A <br /> Date Prepared 819198 819198 8/9198 <br /> Date Analyzed 8/9198 819198 8/9/98 <br /> Instrument I D# gchp24_2 gchp24_2 gchp24_2 <br /> Conc Spiked, ug/L 25 25 25 <br /> Recovery, ug/L 22 21 22 <br /> LCS%Recovery 88 84 88 <br /> Percent Recovery Control Limits <br /> MSIMSI7 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 /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> 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 recoveryis to be used to validate the batch <br />(!7� <br /> ener <br /> Project Manager <br />