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• / \ 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9133 <br /> Sequoia <br /> 404 N Wget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> �III� Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> r <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-1848 /971120-G3 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711G04 -01-04 Reported Dec 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC120497802002A GC120497802002A GC120497802002A GC120497802002A GC120497802002A <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 D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> M S/MSD # 7120299 7120299 7120299 7120299 7120299 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 12/4/97 12/4/97 12/4/97 12/4/97 12/4/97 <br /> Analyzed Date 12/4/97 12/4/97 12/4/97 12/4/97 12/4/97 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Cone Spiked 20pg/L 20ug/L 20pg/L 60pg/L 310pg/L <br /> Result 21 22 23 70 390 <br /> MS % Recovery 105 110 115 117 126 <br /> Dup Result 21 22 24 70 380 <br /> MSD % Recov 105 110 120 117 123 <br /> RPD 00 00 43 00 26 <br /> RPD Limit 0-20 020 020 0-20 0-50 <br /> LCS # LCS120497 LCS120497 LC6120497 LCS120497 LCS120497 <br /> Prepared Date 12/4/97 12/4/97 12/4/97 12/4/97 12/4/97 <br /> Analyzed Date 12/4/97 12/4/97 12/4/97 12/4/97 12/4/97 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20pg/L 20pg/L 20ug/L 60pg/L 310ug/L <br /> LCS Result 22 23 24 72 350 <br /> LCS % Recov 110 115 120 120 113 <br /> 60-140 60-140 60-140 60140 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 /> F I <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> w' 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 /> Peggy Penner <br /> Project Manag •*MS=Matrix Spike,MSD-MS Duplicate, RPD=Relative%Difference 9711604 BLA <1 n <br />