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680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Weget Lane Walnut Creek CA 94598 (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 <br /> 6747 Sierra Court, Ste J MatrQc Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9711618-02-07 Reported Nov 24, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS111897MTBEF2A <br /> Analy. Method EPA 8260 <br /> Prep Method N A. <br /> Analyst L Zhu <br /> MS/MSD #- 971148805 <br /> Sample Conc N D <br /> Prepared Date 11/18/97 <br /> Analyzed Date 11/18/97 <br /> Instrument I.D.#. F3 <br /> Conc. Spiked. 50{Jg/L <br /> Result. 51 <br /> MS % Recovery 102 <br /> Dup Result 54 <br /> MSD % Recov.. 108 <br /> RPD 57 <br /> RPD Limit 0-25 <br /> LCS # LCS111897 <br /> Prepared Date 11/18/97 <br /> Analyzed Date. 11/18/97 <br /> Instrument I.D.# F2 <br /> Conc. Spiked 50pg/L <br /> LCS Result 49 <br /> LCS % Recov: 98 <br /> 60-140 <br /> LCS 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 /> VSEQUOIALYTICAL 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 /> ger **MS Matrix Spike,MSD MS Duplicate, RPD Relative 9b Difference 9711618 GET a2> <br /> �"b <br />