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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9640 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX {916}92t 010 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264/971124-Sl <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 F41-01-05 Reported Dec 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GC120697802004A GC120697802004A GC120697802004A GC120697802004A GC120697802004A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8021 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst K Nill K Nill K Nail K Nill K Nil] <br /> M S/MSD # 7120513 7120513 7120513 7120513 7120513 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 12/6/97 12/6/97 12/6/97 12/6/97 12/6/97 <br /> Analyzed Date 12/6/97 12/6/97 12/6/97 12/6/97 12/6/97 <br /> Instrument I ❑ # HP4 HP4 HP4 HP4 HP4 <br /> Cone Spiked 20ug/L 201ig/L 20ug/L 60ug/L 313 ug/L <br /> Result 20 20 20 62 300 <br /> MS % Recovery 100 100 100 103 96 <br />• Dup Result 19 20 19 59 295 <br /> MSD % Recov 95 100 95 98 94 <br /> RPD 51 00 51 50 17 <br /> RPD Limit 025 0-25 0-25 025 025 <br /> LCS # LCS120697 LCS120697 LCS120697 LCS120697 LCS120697 <br /> Prepared Date 12/6/97 12/6/97 12/6/97 12/6/97 12/6/97 <br /> Analyzed Date 12/6/97 12/6/97 12/6/97 12/6/97 12/6/97 <br /> Instrument I D # HP4 HP4 HP4 HP4 HP4 <br /> Cone Spiked 20ug/L 20ug/L 20ug/L 60ug/L 313ug/L <br /> LCS Result 15 15 16 49 265 <br /> LCS % Recov 75 75 BO 82 85 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#1271 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 entre analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> QZ- linterference,the LCS recovery is to be used to validate the batch <br /> Peggy enner <br /> Project Mana **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9711F41 BLA <4> <br />