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Sequoia 680 Chesapeake Dnve 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 10)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 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# 9511553-05 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Beryllium Cadmium Chromium Nickel Mercury <br /> OC 13atch# ME110895601OMDE ME110895601OMDE ME110895601OMDE ME1108956010MDE ME1109957471M4B <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# 951145001 951145001 951145001 951145001 951108901 <br /> Sample Conc. N D N D 51 24 098 <br /> Prepared Date: 11/8/95 11/8/95 11/8/95 11/8/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 11/9/95 11/9/95 <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 /> Result 95 91 150 120 11 <br /> MS % Recovery 95 91 99 96 60 <br /> Dup Result: 95 91 140 120 17 <br /> MSD % Recov 95 91 89 96 360 <br /> RPD 00 00 69 00 140 <br /> RPD Limit: 0-30 0-30 0-30 0-30 0-30 <br /> L,CS #: BLK110895 BLK110895 BI-Ki 10895 BLK110895 BLK110995 <br /> Prepared Date" 11/8/95 11/8/95 11/8/95 11/8/95 11/9/95 <br /> Analyzed Date 11/9/95 11/9/95 11/9/95 11/9/95 11/9/95 <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 99 97 99 100 020 <br /> LCS % Recov. 99 97 99 100 100 <br /> LCS 75-125 755-125 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 /> 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 /> Mar Cargasacchl <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9511553 TTT <5> <br />