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Sequoia 680 Chesapeake Drive Redwood City CA 94061 (4 15) 364 9600 FAX(415) 364 9233 <br /> } 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 rAX (510)686 9689 <br /> q1,r Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> t r ri 4 <br /> ,' ettler Ryan%Geostrategies bent Project}ID' ' Unocal 6891 <br /> 3035 Prospect Park Drive#80 Matrix Liquid <br /> {`Rancho Cordova, CA 95670 <br /> Attention Greg Gurst Work Order# 9411489 -02 Reported Nov 11, 1994 <br /> COC# <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#' GC11099413TEX02A GC110994BTEX02A GC11099413TEXOM GC1109948TEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method N A N A. N A N X <br /> Analyst. J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # G9411044-02B G9411044-02B G9411044-02B G9411044-02B <br /> Sample Cone N D N D N D N D <br /> Prepared Date: N A N k N A N A. <br /> Analyzed Date 11/9/94 11/9/94 11/9/94 11/9/94 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone. Spiked 10Ng/L 10Ng/L 10ug/L 30yg/L <br /> Result 10 10 10 31 <br /> MS % Recovery 100 100 100 103 <br /> Dup Result. 11 11 11 32 <br /> MSD % Recov 110 110 110 107 <br /> RPD 95 95 95 32 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # <br /> Prepared Date <br /> Analyzed Date: <br /> Instrument I.D.#. <br /> Cone Spiked <br /> LCS Result. <br /> LCS % Recov <br /> LCS 71-133 72-128 72-130 71-120 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA NALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <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 /> Tod e <br /> Project Manager MS Matrix Spike, MSD MS Duplicate,APD Relative%Difference 9411489 GET <2> <br />