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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Waget Lane Walnut Creek CA 94598 (510) 988 9600 1 AX(510)988 9673 <br /> VIWAnalytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> Gettler Ryan/Geostrategles` Client Project ID } Chevron 9--1918', Stockton <br /> h 6747 Sierra Court, Ste J Matrix Solid ;s <br /> Dublin, CA 94568 <br /> Attention Greg Gurss Work Order # 9705472 01 Reported May 14, 1997 <br /> s. n v 4 r }v nx1 w r .r vw4 vv r rr4rt + r r .}r v r}Tti 'vvrvr <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC051397BTEXEXA GCO51397BTEXEXA GC051397BTEXEXA GC051397BTEXEXA GCO51397BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst A Porter A Porter A Porter A Porter A Porter <br /> MS/MSD # 970530615 970530615 970530615 970530615 970530615 <br /> Sample Conc. N D N D N D N D N D <br /> Prepared Date- 5/13/97 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Analyzed Date. 5/13/97 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 12 mg/Kg <br /> Result 019 020 019 056 10 <br /> M % Recovery 95 100 95 93 83 <br /> 0 Dup Result 020 020 020 058 10 <br /> MSD % Recon 100 100 100 97 83 <br /> RPD 51 00 51 35 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> nrvry ♦r rv ♦ v v r ry }1r4+ + mm� vry rt yr ' v .i r }w vrry vrv.xn <br /> LCS# BLK051397 BLK051397 BLK051397 BLK051397 BLK051397 <br /> Prepared Date 5/13/97 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Analyzed Date 5/13/97 5/13/97 5/13/97 5/13/97 5/13/97 <br /> Instrument I D #- GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Colic Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result' 020 019 019 055 10 <br /> LCS % Recov 100 95 95 92 83 <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 /> QU01 rALLYYTI ICAL 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 /> i Gregory <br /> P pject Manager "MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9705472 GET <1> <br />