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680 C3iesap<ake Drive Redwood City, CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> Sequoia <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(916)9921-060 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 <br />;: pei#a 1=nvironme�ifaj Consultants Client i'rojecf 1D: �ocon#7-3330, Stoc n;C <br /><'3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 6040576-79 Reported: Apr 22, Y1996'` <br /> Almeida <br /> DC 5amp Q _::__:. ....:.._....:.. ......... . ....:.._ <br /> 'Atte ..:. .:.:. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene x lenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: V. Dwane <br /> V.Owens V.Owens V.Owens <br /> Concentration 10 ug/L 1a ug/L 30 ug/L <br /> Spiked: 10 ug/L <br /> LCS Batch#: LCSO41696 LCSO41696 LCSO41M LCSO41696 <br /> Date Prepared: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Date Analyzed: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % 99 99 <br /> Recovery: 97 ss <br /> Control LlmltS: 75-125 <br /> 75-125 75-125 75-125 <br /> > z' .........:...................r:...........:..:.....::..... .....................................:...: <br /> MS/MSD <br /> Batch #: 6040465 <br /> 6040066 6040465 6040465 <br /> Date Prepared: 04/16/66 <br /> 04/16/96 04/16/96 04/16/96 <br /> Date Analyzed: 04/16/96 04/16/96 04/16/96 04/16/96 <br /> Instrument I.D.#: GCHP-2 <br /> GCHP-2- GCHP-2 GCHP-2 <br /> Matrix Spike 94 91 <br /> % Recovery: 95 s7 <br /> Matrix Spine <br /> Duplicate% 92 90 <br /> Recovery: 92 9s <br /> Relative% 2.2 1.1 <br /> Difference: <br /> SEQUOIA ANALYTICAL Eory <br /> te: <br /> _ s a control sample of known,interferent free matrix that is analyzed using the same reagents] <br /> / or <br /> �� -/ or <br /> n and analytical methods employed <br /> for the samples. The LCS'e recovery data is used(o <br /> of sample batch results. Due to matrix effects.the QC limits for M5/MSD's are advisory <br /> / Linda C. Schneider ot used to accept or reject batch results. <br /> / Project Manager/Sacramento Laf6a40576.DLT <a> <br />