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Sequoia 680 Chesapeake Drive Redwood City,CA 940uj (415) 364 9600 FAX(415) 364 9233 <br /> 404N 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 Pro Ject+ID Unocal VES/ Balar+lJnith <br /> ,3164 Gold Camp Drive #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Greq Gurss Work Order# 9611 E03-02 Reported Nov 26, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC112296BTEX17A GC112296BTEX17A GC112296BTEX17A GC112296BTEX17A <br /> Analy Method LPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Y Arteaga Y Arteaga Y Arteaga Y Arteaga <br /> MS/MSD # 961198208 961198208 961198208 961198208 <br /> Sample Corte ND N 0 N D N D <br /> Prepared Date 11/22/96 11/22/96 11/22/96 11/22/95 <br /> Analyzed Date 11/22/96 11/22/96 11/22/96 11/22/96 <br /> Instrument I D #. GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked long/L 10ug/L 10 fug/L 30Yg/L <br /> Result 10 99 99 29 <br /> 4wS %Recovery 100 99 99 97 <br /> Dup Result 94 91 92 27 <br /> MSD % Recov .. 94 91 92 90 <br /> RPD- 62 84 73 71 <br /> RPD Limit- 0-25 0-25 0-25 025 <br /> Yi nvv ti v , n• , w <br /> LCS# BLK112296 BLK112296 BLK112296 BLK112296 <br /> Prepared Date* 11/22/96 11/22/96 11/22/96 11/22/96 <br /> Analyzed Date 11/22/96 11/22/96 11/22/96 11/22/96 <br /> Instrument I.D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Cone Spiked 10 fig/L 10 fug/L 10 fig/L 30 frg/L <br /> LCS Result- 10 96 98 30 <br /> LCS % Recov.. 100 96 98 100 <br /> MS/M9D 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 /> OEQUOIA 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 tall within specified control limits due to matrix <br /> I eereg interference,the LCS recovery is to be used to validate the batch <br /> Project Manager `*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9611E03 GET 42> <br />