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i <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 940ey (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> ;Gettler Ryan/Geostrategies Client Project ID Unocal 6981, 4855 06 { <br /> ,{3164 Gold Camp Drive #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> '�Attentlon Greq Gurss Work Order# 961OH87 -01, 02 Reported Nov 12, 1996 , <br /> ria x r .. s ,. . r • . w • Y ' ,2 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC103096BTEX02A GC1030966TEX02A GC103096BTEX02A GC103096BTEX02A <br /> Analy Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Pre2 Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Arteaga <br /> MS/MSD # 961001401 961OD1401 961OD1401 961OD1401 <br /> Sample Cone . N D N D N D N D <br /> Prepared Date- 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Analyzed Date- 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument I D #' GCHP-02 GCHP-02 GCHP-02 GCHP-02 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 13 11 10 29 <br /> orS % Recovery 130 110 100 97 <br /> Dup Result 12 11 10 29 <br /> MSD % Recov 120 110 100 97 <br /> RPD 80 00 00 00 <br /> RPD Limit: 0-25 0-25 025 0-25 <br /> LCS# BLK103096 BLK103096 BLK103096 BLK103096 <br /> Prepared Date 10/30/96 10/30;96 10/30/96 10/30/96 <br /> Analyzed Date 10/30/96 10/30/96 10/30/96 10/30/96 <br /> Instrument I D # GCHP-02 GCHP-02 GCHP-02 GCHP-02 <br /> Conc Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result 12 10 99 27 <br /> LCS % Recov 120 100 99 90 <br /> M M D 60-140 60-140 60140 60-140 <br /> LCS 70-130 70130 70130 70-130 <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 /> ISEQUOIA ANALYTICAL 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 /> Gregory <br /> Project Manager ""MS=Matrix Spike,MSO=MS Duplicate, RPD=Relative% Difference 961OH87 GET <1> <br />