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41� Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (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 Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> ,,Dublin, CA 94568 <br /> ,Attention Deanna Harding Work Order# 9611619 -06, 07 Reported Nov 22, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xyfenes <br /> Benzene <br /> OC Batch#' GC111896BTEX2IA GC111896BTEX2IA GC111896BTEX21A GC111896BTEX21A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: G Fish G Fish G Fish G Fish <br /> M S/MSD# 9611 W813 961138813 961138813 961138813 <br /> Sample Cone ' N D N D N D N D <br /> Prepared Date. 11/18/96 11/18/96 11/18/96 11/18/96 <br /> Analyzed Date 11/18/96 11/18/96 11/18/96 11/18/96 <br /> Instrument 1 D # GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone.Spiked. 10kg/L 10pg/L 10pg/L 30ug/L <br /> Result 11 99 99 30 <br />. MS % Recovery: 110 99 99 100 <br /> Dup Result- 10 97 97 29 <br /> MSD %Recov.. 100 97 97 97 <br /> RPD- 95 20 20 34 <br /> RPD Limit: 0-25 0.25 0-25 0-25 <br /> LCS# BLK111896 BLK111896 BLK111896 BLK111896 <br /> Prepared Date 11/18/96 11/18/96 11/18/96 11/18/96 <br /> Analyzed Date' 11/18/96 11/18/96 11/18/96 11/18/96 <br /> Instrument I.D.# GCHP21 GCHP21 GCHP21 GCHP21 <br /> Cone. Spiked 10Ng/L 10119/L 10ug/L 30Ng/L <br /> LCS Result. 95 90 91 28 <br /> LCS % Recov. 95 90 91 93 <br /> MS/M,--,u 60-140 60-140 50-140 <br /> 60-140 <br /> LCS <br /> 70.130 70-130 70.130 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 />"-EQUOIA ALYTICAL 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 0 <br /> the recovery of analytes from the matrix spike does riot fall within specified control limits due to matrix <br /> -MIRe Gregory interference,the LCS recovery is to be used to validate the batch <br /> Project Manager "*MS-Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> 9611619 GET <3> <br />