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I Itl <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> IIS Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 911 9600 FAX(916)921 0100 <br /> • Blaine Tech Services, Inc Client Project ID Chevron 9-1452/970228-F2 <br /> 1680 Rogers Avenue Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9703094 -01-02 Reported Mar 25, 1997 <br /> OUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC031097BTEX22A GC031097BTEX22A GC031097BTEX22A GC031097BTEX22A <br /> Analy.Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst- k Porter A Porter A. Porter A.Porter <br /> MS/MSD# 9702F3511 9702F3511 9702F3511 9702F3511 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Analyzed Date 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Instrument LD# GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 101ug/L 10pg/L 10pg/L 30pg/L <br /> Result, 93 89 89 26 <br /> MS %Recovery* 93 89 89 87 <br /> iDup. Result 89 87 87 25 <br /> MSD %Recov 89 87 87 83 <br /> RPD 44 23 23 39 <br /> RPD Limit 0-25 0-25 0.25 0.25 <br /> LCS#. BLK031097 BLK031097 BLK031097 BLK031097 <br /> Prepared Date 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Analyzed Date 3/10/97 3/10/97 3/10/97 3/10/97 <br /> Instrument LD# GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc.Spiked' 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result' 95 93 96 28 <br /> LCS%Recov 95 93 96 93 <br /> 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 /> S U IAAAL:YTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> e 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> P g nner <br /> Pr ct Manager *•MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9703094 BLA ¢1> <br />