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(i) 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 /> v <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-1918 /960730-1-12 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller Work Order# 9608106-03, 10 Reported Aug 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> GC Batch#- GCO81396BTEX20A GC081396BTEX20A GC081396BTEX20A GCO81396BTEX20A <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method- EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jima D Jima D Jirsa D Jirsa <br /> MS/MSD # 960816714 960816714 960816714 960816714 <br /> Sample Conc N D N D N D ND <br /> Prepared Date 8/13/96 8/13/96 8/13/96 8/13/96 <br /> Analyzed Date 8/13/96 8/13/96 8/13/96 8/13/96 <br /> Instrument I D # GCHP20 GCHP20 GCHP20 GCHP20 <br /> Cone Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> Result 84 83 82 24 <br /> MS %Recovery 84 83 82 80 <br /> Dup Result 82 80 81 24 <br /> MSD%Recov 82 80 81 80 <br /> RPD 24 37 12 00 <br /> RPD Limit 0-25 0-25 0-25 025 <br /> LCS #' BLK081396 BLK081396 BLK081396 BLK081396 <br /> Prepared Date 8/13/96 8/13/96 8/13/96 8/13/96 <br /> Analyzed Date 8/13/96 8/13/96 8/13/96 8/13/96 <br /> Instrument I D# GCHP20 GCHP20 GCHP20 GCHP20 <br /> Cone. Spiked 10pg/L 10pg/L 10pg/L 30pg/L <br /> LCS Result 86 86 86 26 <br /> LCS%Recov 86 86 86 87 <br /> MS/MSD 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 /> SEQUOIA ANAL ]CAL 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 k <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> t interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Mana er **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9608106 BLA ¢2> <br />