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4T) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N W�get Lane Walnut Creek CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> v „v <br /> Touchstone Developments Client Project ID Chevron 9-8264/8264-1 <br /> 6280 Stoneridge Mall Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511553-01-05 Deported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> OC Batch# GC110895BTEXEXB GC110895BTEXEXB GC110895BTEXEXB GC110895BTEXEXB GC1107950HBPEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3550 <br /> Analyst. E Cunanan E Cunanan E Cunanan E Cunanan J Minkel <br /> MS/MSD# 951114505 951114505 951114505 951114505 951137202 <br /> Sample Conc N D ND ND N D 42 <br /> Prepared Date- 11/8/95 11/8/95 11/8/95 11/8/95 11/7/95 <br /> Analyzed Date 11/8/95 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 GCHP5 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 25 mg/Kg <br /> Result 018 018 019 056 99 <br /> MS %Recovery 90 90 95 93 228 <br /> Dup Result 018 018 019 056 63 <br /> MSD %Recov 90 90 95 93 84 <br /> RPD 00 00 00 00 44 <br /> RPD Limit 0-50 0-50 0-50 0-50 0-50 <br /> LCS# BLK110995 BLK110995 BLK110996 BLK110995 BLK110795 <br /> Prepared Date 11/8/95 11/8/95 11/8/95 11/8/95 11/7/95 <br /> Analyzed Date. 11/8/95 11/8/95 11/8/95 111/8/95 11/8/95 <br /> Instrument LD # GCHP1 GCHP1 GCHP1 GCHP1 GCHP5 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 25 mg/Kg <br /> LCS Result 020 020 020 060 23 <br /> LCS %Recov. 100 100 100 100 92 <br /> MS/MSD <br /> LCS <br /> Control Limits 55-145 47-149 47-155 56-140 38-122 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> S1E:Cargasacchi <br /> A 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 /> Ma <br /> Project Manager *"MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9511553 TTT <6> <br />