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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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-5075/951031-M1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9511057-04-05 Reported Nov 13, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC110295BTEX20A G0110295BTEX20A GC110295BTEX20A GC110295BTEX20A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst J Woo J Woo J Woo J Woo <br /> MS/MSD# 95llG1111 9511G1111 9511G1111 9511 G1 111 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Analyzed Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked 10pg/L 10ug/L 10ug/L 30}ig/L <br /> Result 11 11 11 32 <br /> MS % Recovery 110 110 110 107 <br /> Dup Result 11 11 11 33 <br /> MSD % Recov 110 110 110 110 <br /> RPD 00 00 00 31 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS # BLK102795 BLK102795 BLK102795 BLK102795 <br /> Prepared Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Analyzed Date 11/2/95 11/2/95 11/2/95 11/2/95 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Conc Spiked- 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result: 10 10 10 31 <br /> LCS % Recov 100 100 100 103 <br /> M M <br /> LCS 71-133 72-128 72-130 71-120 <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 /> • SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> Z <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 1s to be used to validate the batch <br /> Peggy Penner <br /> Project Manager *"MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9511057 BLA <2> <br />