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Sequoia680 Chesapeake Dnve Redwood CityCA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 96W FAX(916)921 0100 <br /> Gettler Ryan/Geostrategles Client Project ID Chevron 9-6171, Stockton <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9803027 -01, 02 Reported Mar 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GG0309986M07A GCO30998BTEX17A GCO30998STEX17A GCO30998BTEX17A 00030998BTEX17A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C DeMartinl C DeMartinl C DeMartini C De Martini C DeMartini <br /> MS/MSD # 980212102 980212102 980212102 980212102 980212102 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 3/9/98 3/9/98 3/9/98 3/9/98 3/9/98 <br /> Analyzed Date 3/9/98 3/9/98 3/9/98 3/9/98 3/9/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10 fug/L 10 fug/L 10 ftg/L 30 fug/L 60 fug/L <br /> Result 10 99 96 30 56 <br /> MS % Recovery 100 99 96 100 93 <br /> isDup Result 98 94 82 28 52 <br /> MSD % Recov 98 94 82 93 87 <br /> RPD 20 52 16 69 74 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK030998 BLK030998 BLK030998 BLK030098 BLK030998 <br /> Prepared Date 3/9/98 3/9/98 3/9/98 3/9/98 3/9/98 <br /> Analyzed Date 3/9/98 3/9/98 3/9/98 3/9/98 3/9/98 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10fug/L 10Ng/L 30fug/L 60ug/L <br /> LCS Result 10 9 5 92 29 54 <br /> LCS % Recov 100 95 92 97 90 <br /> MSIMSD 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 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 /> 0 VSEQUOIAYTICAL 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 /> er **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative %Difference 9803027 GET <>> <br />