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'r Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> ID 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Chevron 9-6171, Stockton n <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9707837-03 Reported Aug 4, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#• GCO72597BTEX02A GC072597BTEX02A GC072597STEX02A GC072597BTEX02A GCO725978TECO2A <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' A. Mlraftab A.Mlraftab A.Mlraftab A.Mlraftab k Mlraftab <br /> MS/MSD # 9707B3802 9707B3802 970783802 9707B3802 9707B3802 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date. 7/25/97 7/25/97 7/25/97 7/25/97 7/25/97 <br /> Analyzed Date. 7/25/97 7/25/97 7/25/97 7/25/97 7/25/97 <br /> Instrument I.D.#: GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked: 10ug/L 10ug/L 10ug/L 30ug/L 60ug/L <br /> Result: 10 98 99 30 65 <br /> 40S % Recovery, 100 98 99 100 108 <br /> Dup. Result- 9 4 92 9 4 28 63 <br /> MSD % Recov 94 92 94 93 105 <br /> RPD: 62 63 52 69 31 <br /> RPD Limit: 0-25 0.25 0-25 0-25 0-25 <br /> LCS # BLK072597 BLK072597 BLK072597 BLK072597 BLK072597 <br /> Prepared Date: 7/25/97 7/25/97 7/25/97 7/25/97 7/25/97 <br /> Analyzed Date: 7/25/97 7/25/97 7/25/97 7/25/97 7/25/97 <br /> Instrument I D #: GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked" 10ug/L 10pg/L 10Pg/L 30lig/L 60yg/L <br /> LCS Result. 10 98 10 30 67 <br /> LCS % Recov. 100 98 100 100 112 <br /> 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 /> Quo NALYTICAL 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 H <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 /> I Gregory <br /> Project Manager MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 97071337 GET <2> <br />