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Sequoia 680 Chesapeake Dnve Redwood Ctry 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 /> i <br /> Gettler Ryai /Geostrategles Client Project ID Chevron 9-6171, Stockton F <br /> 6747 Sierra Court, Ste G Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9511461-06, 07 Reported Nov 10, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC110995BTEX22A GC110995BTEX22-A GC110995BTEX22A GC110995STEX22A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> f <br /> Analyst' A.Miralit A. Miralit A.Miralit A. Miralit <br /> M S/MSD # 951143210 951143210 951143210 951143210 <br /> Sample Conc. N D N D N D N D <br /> Prepared Date 11/9/95 11/9/95 11/9/95 11/9/95 y <br /> Analyzed Date. 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Instrument I.D.#* GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc. Spiked. 10 pg/L 10 Ng/L 10 Ng/L 30 Ng/L <br /> Result 10 96 97 28 <br /> orS % Recovery* 100 96 97 93 <br /> Dup. Result 10 96 97 29 <br /> MSD % Recov. 100 96 97 97 <br /> RPD 00 00 00 35 <br /> RPD Limit. 0-50 0-50 0-50 0-50 <br /> n tJ`'jvwY hrvYM�rnw s x'. rr nvrvty ..v r •r5 tv,}vv M1` r SO ♦ xn 4 va � L.. v r zmtrrL ryn iv.4} `t v v. M1i.Ar r <br /> $t v v •.x rA n v r .n n ♦♦ r n <br /> LCS # BLK110995 BLK110995 BLK110995 BLK110995 <br /> Prepared Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 11/9/95 <br /> Instrument I D.# GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 10pg/L 10119/L 10pg/L 30N9/L <br /> LCS Result 84 84 87 26 <br /> LCS % Recov 84 84 87 87 <br /> M M D <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 /> SQUOIA 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 /> l the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Mike Gregory <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9511461 GEC <27 <br />