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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 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 141 N El Dorado <br /> 1680 Rogers Ave <br /> San Jose, CA 95112 <br /> Attention Fran Thle OC Sample Group 9810725-01-06 Reported Oct 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC101398BTEX03A <br /> Sample No GW9810024-1 <br /> Date Prepared 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Date Analyzed 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc , uglL N D N D N D N D <br /> Conc Spiked, ug1L 10 10 10 30 <br /> Matrix Spike, ug/L 11 11 11 34 <br /> to % Recovery 110 110 110 113 <br /> Matrix <br /> pike Duplicate, ug/L 11 11 11 34 <br /> % Recovery 110 110 110 113 <br /> elative% Difference 00 00 0 0 00 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS101398A <br /> Date Prepared 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Date Analyzed 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc. Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 94 91 9 0 27 <br /> LCS % Recovery 94 91 90 90 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60-140 60-140 60-140 <br /> LCS 70130 70-130 70-130 70-130 <br /> Quality Assur nce 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 /> ,S A AN LYTIC <br /> preparation and lytical methods employed for the samples The matrix spike is an aliquot of sample <br /> / fortifi nown 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 matnx <br /> interference the LCS recovery is to be used to validate the batch <br /> P ggy enner <br /> Pr Manager <br />