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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N W1get Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Iwo Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Btalne Tech Services Client Project ID Shell 2575 Country Club Blvd <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9810737-01-03 Reported Oct 27, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch# GC101498BTEX03A <br /> Sample No GW9810013-6 <br /> Date Prepared 10/14/98 <br /> Date Analyzed 10/14/98 <br /> Instrument I D# GCHP03 <br /> Sample Cone , uglL N D <br /> Cone Spliced, ug1L 250 <br /> Matrix Spike,uglL 240 <br /> %Recovery 97 <br /> Matrix <br /> pike Duplicate, uglL 260 <br /> %Recovery 906 <br /> -elative%Difference �8 9 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS101498A <br /> Date Prepared 10/14/98 <br /> Date Analyzed 10/14/98 <br /> Instrument I D# GCHP03 <br /> Cone Spiked, uglL 250 <br /> LCS Recovery, uglL 260 <br /> LCS % Recovery 105 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 <br /> LCS 70-130 <br /> Quality Ass rice 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 /> QU A LYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> oitifled 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 recovery is to be used to validate the batch <br /> eggy, enner <br /> ct Manager <br />