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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N WI et Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> g 8 <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 /> 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 9808898-01 04 Reported Aug 31, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8020 <br /> Analyst G GAMBOA <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GC082698BTEXEXD <br /> Sample No 9808A45-6 <br /> Date Prepared 8126198 8126198 8/26/98 8126198 <br /> Date Analyzed 8126198 8126198 8126198 8/26198 <br /> Instrument I D# GCHP7 GCHP7 GCHP7 GCHP7 <br /> Sample Cone , mg/Kg N D N D N D N D <br /> Conc Spiked, mg/Kg 020 020 020 060 <br /> Matrix Spike mg/Kg 018 0 17 0 17 060 <br /> % Recovery 90 85 85 100 <br /> Matrix <br /> pike Duplicate, mg/Kg 0 17 017 016 052 <br /> % Recovery 85 85 80 87 <br /> Relative % Difference 5 7 00 6 1 14 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GC082698BTEXEXD <br /> Date Prepared 8126198 8126198 8126/98 8126198 <br /> Date Analyzed 8126198 8126198 8/26198 8126198 <br /> Instrument I D# GCHP7 GCHP7 GCHP7 GCHP7 <br /> Cone Spiked, mg/Kg 020 020 020 060 <br /> Recovery, mg/Kg 0 18 019 018 0 57 <br /> LCS % Recovery 90 95 90 95 <br /> Percent Recovery Control Limits <br /> MSIMSD 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 /> IF 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 recoverX is to be used to validate the batch <br /> ayvan al <br /> Project anager <br />