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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(5 101 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Touchstone Development Client Project 1D Chevron 9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604898 06, 07 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel Mercury <br /> GC Batch# ME0415966010MDE ME0415966010MDE ME041596601OMDE ME041596601OMDE ME0415967471M4A <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 7471 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 EPA 7471 <br /> Analyst C Medefesser C Medefesser C Medefesser C Medefesser T Hua <br /> MS/MSD# 960494501 960494501 960494501 960494501 <br /> Sample Conc. 069 N D 96 150 <br /> Prepared Date 4/15/96 4/15/96 4/15/96 4/15/96 <br /> Analyzed Date 4/16/96 4/16/96 4/16/96 4/16/96 <br /> Instrument I D# MTJA2 MTJA2 MTJA2 MTJA2 <br /> Conc Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg <br /> Result- 96 95 200 250 <br /> MS % Recovery 95 95 104 100 <br /> Dup Result- 97 95 210 250 <br /> MSD % Recov. 96 95 114 100 <br /> RPD 10 00 49 00 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> LCS#: BLK041596 BLK041596 BLK041596 BLK041596 BLKG41596 <br /> Prepared Date 4/15/96 4/15/96 4/15/96 4/15/96 4/15/96 <br /> Analyzed Date- 4/16/96 4/16/96 4/16/96 4/16/96 4/15/96 <br /> Instrument I D # MTJA2 MTJA2 MTJA2 MTJA2 MPE4 <br /> Conc Spiked 100 mg/Kg 100 mg/Kg 100 mg/Kg 100 mg/Kg 0 20 mg/Kg <br /> LCS Result 100 100 100 100 017 <br /> LCS % Recov 100 100 foo 100 85 <br /> LCS 75-125 75-125 75-125 75-125 85-115 <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 ANALYTICA 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 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 is to be used to validate the batch <br /> evin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9604898 TTT <7> <br />