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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Cmck CA 94,598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> ,Gettler Ryan%Geostrategies Client Project ID Chevron 9-6171, Stockton v <br /> 6747 Sierra Court, Ste G Matrix Liquid <br /> Dublin, CA 94568 ; <br /> Attention Deanna Harding Work Order# 9511461 -01-05 Reported Nov 10, 1995 } <br /> F +v. yr rrr, ,r f.w r~ n,rrr ry u v + n + , ,+ry +`r w r r v + L , r r ,+• t +r + ,rvr v v.nr M v4 r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC110895BTEX22A GC110895BTEX22A GC110895BTEX22A GC110895BTEX22A <br /> Analy. Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst- R Lee R Lee R Lee R Lee <br /> MS/MSD #: 951130002 951130002 951130002 951130002 <br /> Sample Cone. N D N D N D N D <br /> Prepared Date. 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Analyzed Date- 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D.#: GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone. Spiked: to pg/L 10 yg/L 10 Ng/L 30 jig/L <br /> Result: 10 98 10 31 <br /> OMS %Recovery 100 98 100 103 <br /> Dup Result, 94 98 9 7 29 <br /> MSD % Recov - 94 98 97 97 <br /> RPD* 62 00 30 67 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> r ., w, r +v ks,+f+, .,. r<r< ,. u r ,u ,.>r �+ ++., + .. r + r ,. + .. , r N . r ,+++ + ».++ , , r rr ...v ♦,,, <br /> LCS #: BLK110895 BLK110895 BLK110895 BLK110895 <br /> Prepared Date. 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Analyzed Date. 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D,#- GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 10pg/L 10ug/L long/L 30ug/L <br /> LCS Result. 10 9 9 97 27 <br /> LCS % Recov : 100 99 97 90 <br /> MS/MSD <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-tree matrix that is analyzed using the same reagents, <br /> OEOUOIA 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 /> Mike Gregory <br /> Project Manager "*MS=Matrix Spike, MSD-MS Duplicate,RPD=Relative%Difference 9511461 GET <11> <br />