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Sequoia 680 Chesapeakd Drive 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 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> k'Blalne Tech Services, Inc ClientProjectID M r Shell, Stockton /96(}424-Ai <br /> ,1985 Timothy Drive Matrix Liquid ; <br /> San Jose, CA 95133 ` <br /> i0, 1996 t <br /> Attention Jim Keller Work Order# 9604J37 -0i-02, 04-05r n A _Reported May <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC050296BTEX06A GC050296BTEX06A GCO50296BTBMA GCOW296BTEX06A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD#' 96041-12623 96041-12623 9604H2623 9604H2623 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date: 5/2/96 5/2/96 5/2/96 5/2/96 <br /> Analyzed Date. 5/2/96 5/2/96 5/2/96 5/2/96 <br /> Instrument I.D.#: GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc. Spiked' 10 pg/L 10 pg/L 10 pg/L 30 pg/L <br /> Result' 99 99 99 31 <br /> MS%Recovery. 99 99 99 103 <br /> Dup. Result: 95 95 95 30 <br /> MSD %Recov.: 95 95 95 100 <br /> RPD: 41 41 41 33 <br /> RPD Limit. 0-25 0-25 0-25 0-25 <br /> LCS#: BLK050296 BLK050296 BLK050296 BLK050296 <br /> Prepared Date: 5/2/96 5/2/96 5/2/96 5/2/96 <br /> Analyzed Date. 5/2/96 5/2196 5/2/96 5/2/96 <br /> Instrument 1 D#' GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc Spiked lopg/L lope/L 10pg/L 30pg/L <br /> LCS Result: 98 98 98 30 <br /> LCS% Recov. 98 98 98 100 <br /> MS/MSD 60-140 60.140 60-140 60-140 <br /> LCS 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 /> A 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 h <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 /> nner <br /> 1pl%rectManager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9604,)37 BLA <1> <br />