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45) 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 a Sacramento,CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , 6211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511587-01-17 Reported Nov 16, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel <br /> QC Batch# ME1110956010MDE ME111095601OMDE ME111095601OMDE M(E1110956010MOE <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 # 951158701 951158701 951158701 951158701 <br /> Sample Conc 0 68 N D 40 43 <br /> Prepared Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Analyzed Date 11/11/95 11/11/95 11/11/95 11/11/95 <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 100 90 140 130 <br /> MS % Recovery 99 90 100 87 <br /> Dup Result 100 91 140 140 <br /> MSD % Recov 99 91 100 97 <br /> RPD 00 11 00 74 <br /> RPD Limit 0-30 0-30 0-30 0-30 <br /> LCS # BLK111095 BLK111095 BLK111095 BLK111095 <br /> Prepared Date 11/10/95 11/10/95 11/10/95 11/10/95 <br /> Analyzed Date 11/11/95 11/11/95 11/11/95 11/11/95 <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 99 100 100 <br /> LCS % Recov. 100 99 100 100 <br /> MS/MSD <br /> LCS 75125 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 /> SE OIA 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Mark Cargasacchl <br /> Project Manager *MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9511587 TTT <2> <br />