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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 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 /> 1 ATC Associates, Inc Client Project ID Continental Grain <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9808898-05-06 Reported Aug 31, 199E <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8020 <br /> ' Analyst G PESHINA <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC082498BTEXEXB <br /> Sample No 9808D36-1 <br /> Date Prepared 8124/98 8124198 8/24/98 8124/98 <br /> iDate Analyzed 8124/98 8124/98 8/24/98 8124/98 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Sample Cone , mg/Kg N D N D N D N D <br /> Cone Spiked mg/Kg 020 020 020 060 <br /> Matrix Spike mg/Kg 028 026 0 33 1 2 <br /> Recovery 140 130 165 200 <br /> Matrix <br /> Spike Duplicate, mg/Kg 0 1 8 024 0 29 1 0 <br /> % Recovery 90 120 145 167 <br /> Relative % Difference 43 so 13 18 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC082498BTEXEXB <br /> Date Prepared 8/24198 8/24/98 8124/98 8124/98 <br /> Date Analyzed 8/24198 8/24/98 8124/98 8124/98 <br /> Instrument I D# GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked, mg/Kg 020 020 020 060 <br /> Recovery, mg/Kg 023 023 023 111511 <br /> LCS % Recovery 115 115 115 113 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <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 /> SEQUOIA ANALYTICAL 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 N <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 /> K an Klm�y I <br /> Project Ma ger <br />