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' yrY <br /> Sequoia 680 Chesapeake Drive Redwood City,Ch 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 488 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettlei Ryan/Ge'ostrategles ' Client Project ID Chevron 9-0171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> !Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9702D34 01-07 Reported Mar 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GCO2-2897BTEX06A GCO22897BTEX06A GCO22897BTEX06A GCO22897BTEX06A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. A.Porter A.Porter A.Porter A.Porter <br /> M S/MSD# 9702A5508 9702A5508 9702,45508 9702A5508 <br /> Sample Cone.. N D N D N D N D <br /> Prepared Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Analyzed Date. 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Instrument I D.#: GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc. Spiked: 10yg/L 10 fig/L 10Ng/L 30 jug/L <br /> Result: 99 10 11 32 <br /> MS % Recovery: 99 100 110 107 <br /> • Dup Result: 98 10 11 32 <br /> MSD % Recov : 98 100 110 107 <br /> RPD* 10 00 00 00 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> r x}'.p v L v +w.+nw.i Ln p rjr r 0! v t L tnv L ♦ h r .v J . v n +rn ` v+vv v+svvv4 ! Y L .vtut4 J3 ` J <br /> rnryrr} ` + ` rn n ! + •} + rnr nr ~ }rr x } r ` ! r f m v + +xnn rvrrcnw rn+ • nrrr � <br /> LCS # BLK022897 BLK022897 BLK022897 BLK022897 <br /> Prepared Date. 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Analyzed Date 2/28/97 2/28/97 2/28/97 2/28/97 <br /> Instrument I.D.#. GCHP6 GCHP6 GCHP6 GCHP6 <br /> Cone. Spiked 10Ng/L 10ug/L lopg/L 30Ng/L <br /> LCS Result. 99 10 11 33 <br /> LCS % Recov.. 99 100 110 110 <br /> 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 /> SEQUOIA A 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 If <br /> the recovery of analytesirom 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 /> regory <br /> Project Manager "*MS=Matrix Spike,MSD=MS Duplicate,RPD-Relative%Difference 9702D34 GET t 1> <br />