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` h Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Hates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />�GeoStrategies Inc Client Project ID Unocal #6981 <br /> 3035 Prospect Park Dr, Suite 80 Matrix Air <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurss QC Sample Goup 4120373-374 Reported Dec 20, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS121394 LCS121394 LCS121394 LCS121394 <br /> Date Prepared: 12/13/94 12/13/94 12/13/94 12/13/94 <br /> Date Analyzed' 12/13/94 12/13/94 12/13/94 12/13/94 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS <br /> 0 Recovery 88 89 89 89 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BLK121394 BLK121394 BLK121394 BLK121394 <br /> Date Prepared: 12/13/94 12/13/94 12/13/94 12/13/94 <br /> Date Analyzed 12/13/94 12/13/94 12/13/94 12/13/94 <br /> instrument I D.#' GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 88 89 89 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 91 91 91 <br /> Relative % <br /> Difference. 22 22 22 22 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> p 1" validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> 0 <br /> Jen a Higgins and are not used to accept or refect batch results <br /> Project Manager <br /> 4120373 GSI <2> <br />