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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 94.598 (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 /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604850 01, 02 Reported Apr 25, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> QC Batch# ME041596601CMDE ME041596601OMDE ME0415966010MDE ME041596601OMDE <br /> Analy Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Prep Method EPA 3050 EPA 3050 EPA 3050 EPA 3050 <br /> Analyst C Medefesser C Medefesser C Medefesser C Medefesser <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 <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 /> LCS Result 100 100 100 100 <br /> LCS % Recov 100 100 100 100 <br /> LCS 75-125 75-125 75-125 75-125 <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 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 fail within specified control limits due to matrix <br /> Kevin Follett interference,the LCS recovery Is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9604850 TTT <6;, <br />