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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> a_ _� <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9z1-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gealer Ryan Geostragec) es Cllen, F'rn,ec,t $D 140124 04 <br /> 3164 Gold tamp D.ve #240 <br /> Rancho (orduva, CA 95670 <br /> Attf,ntion St„ve Cart« QC 5arnule ,rear} 9401095 ieportcd Jul 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid ------ ._.-__�_—_- - ------ ----- <br /> !4 Method EPA 8020 <br /> Analyst N Herrera <br /> ANALYTE Benzene Toluene Ethy€benzene Xylenes <br /> C', Ba+ci1 # GCC70038BTEX02A <br /> Sample No GW9806G68-10 - <br /> Date Prepared 7/2/98 712198 712198 7/2198 <br /> Date Analyzed 7/2/98 712198 7/2198 7/2198 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sample Cone ug/L N D N D N C N D <br /> Cant, Spiked ug/L 10 10 10 30 <br /> Matrix Spike ug/L 10 9 6 9 5 28 <br /> `Yo Recovery 102 96 95 93 <br /> Matrix <br /> Spike Duplicate ug/L 9 9 9 3 9 3 27 <br /> % Recovery 99 93 93 90 <br /> I <br /> Relative % Difference 3 0 3 2 2 1 3 t <br /> RPD Control Limits 0-25 026 0 25 0-25 <br /> LCS Batch# G1q/BLK070298ABS <br /> Date Prepared 7/2198 712198 7121')8 /12198 <br /> Date Anaryzea 7/tr96 7/2f9a :12,9L 7,2138 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Cone Spiked ug/L 10 10 10 30 <br /> LCS Recovery ug/L 11 9 9 9 9 29 <br /> LCS % Recovery 106 99 99 97 <br /> Percent Recovery Control Limits <br /> PPSIMSD 60 140 60140 60 140 60140 <br /> LCS 70 130 70130 70130 70130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been m(-t <br /> Please Note <br /> The LCS ss a control sample of Known interterent frte mat ix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples Thr matrix spike i.an ai+quot of samule <br /> fortdieo with known quantitleq of specihG 10mpounds and subil-cteo to the entre analytical proci.dui(, 11 <br /> the recovery of analy,es from thr iia ox spike does not fall within specified control limits due to matrix <br /> rnterlerence the LCS recovery is to be useo to valid-).e the batch _ <br /> Tod Granicher <br /> Project Manager <br />