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r <br /> 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 /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 rAx(415)921-010 0 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • 1551 Industrial Road San Carlos,CA 94070 4111 (650)232 9600 FAX(650)232-9612 <br /> Gettler Ryan/Geostrategles Client Project ID Tosca 6981 4707 Pacific Ave <br /> 6747 Sierra Court Suite J <br /> Dublin, CA 94568 <br /> Attention Deanna Harding QC Sample Group 9902059-01-02 Reporters Fete 13, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst BTF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GCO20299BTEX17A <br /> Sample No GW9901F36-1MS <br /> Date Prepared 212199 212/99 212199 212199 <br /> Date Analyzed 212199 212199 2/2199 212199 <br /> Instrument I D # GCHP17 GCHP1 7 GCHP17 GCHP17 <br /> Sample Conc , ug1L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike ug/L 8 8 8 7 8 7 26 <br /> % Recovery 88 87 87 85 <br /> © Matrix <br /> Spike Duplicate, ug/L 8 9 8 7 8 5 24 <br /> % Recovery 89 87 85 82 <br /> Relative % Difference 1 1 0 0 2 3 3 6 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS020299A <br /> Date Prepared 212199 212/99 212199 212199 <br /> Date Analyzed 212199 212/99 212199 212199 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug/L 10 99 9 8 29 <br /> LCS % Recovery 101 99 98 97 <br /> Percent Recovery Control Limits <br /> MSIMSD 60 140 60140 60140 60140 <br /> LCS 70 130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have 6ee)n rne;r <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix Chart is analyzed usury the same reagents <br /> •SEQUD NALYTICAL preparation and analytical methods employed for the samples The matrix spike is en aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure M <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recover is to be used to validate the batch <br /> Ro6ald M Chew <br /> Project Manager <br />