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i <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364 9133 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (915)988 9600 FAX(925)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 ofoo <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792 0342 <br /> I' <br /> Ground Zero Analysis, inc Client Prosect 1D Knowles Flock <br /> 1714 Main St <br /> Escalon, CA 95320 <br /> I Attention Jeanne Bueiethal QC Sample Group 9806A65 01-02 Reported Jun 22, 1998 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst N HERRERA <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC061698BTPX17A <br /> Sample No GW9806663-9 <br /> 1 <br /> Date Prepared 6116198 6116198 6116198 6/16198 <br /> Date Analyzed 6/16198 6116198 6/1E/98 6116/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Sample Conc ug/L N D N D N D N D <br /> Conc Spiked ug1L 10 10 10 30 <br /> Matrix Spike uglL 9 5 8 7 8 7 26 <br /> % Recovery 95 87 87 87 <br /> Matrix <br /> Spike Duplicate uglL 9 6 8 9 8 2 27 <br /> % Recovery 98 89 8'' 90 <br /> Relative % Difference 3 1 2 3 5 9 3 4 I <br /> RPD Control Limits 0 25 0-25 0-25 0 25 <br /> LCS Batch# GWBLK061698A <br /> Date Prepared 6116/98 6116198 6/16,98 6116198 <br /> Date Analyzed 6116/98 6116198 6;16,98 6/16,98 <br /> Instrument I D# GCHP17 GCHP1 7 GCHP17 GCHP1 7 <br /> Conc Spiked, ug1L 10 10 10 30 <br /> I <br /> LCS Recovery, ug1L 9 6 9 1 8 E 27 <br /> LCS 010 Recovery 96 91 86 90 <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 /> I 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 matnx spike is an aliquot of sample <br /> ` fortified with known quantities cf specific compounds and subjected to the entire analytical procedure It <br /> r <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 /> .ayvan Kim <br /> Prosect Manager <br /> r <br />