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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 19W Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Strike,Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 6oundwater Technology Client project ID Chevron #9-1918, Stockton, CA V <br /> 1401 Halyard Drive, Suite 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota QC Sample Group 5060120-27, 130-37, 140-47 Reported Jun 6, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch,# LCS060595 LCS060595 LCS060595 LCS060595 <br /> Date Prepared 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Date Analyzed 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Instrument I D #. GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> LCS% <br /> Recovery 95 95 97 97 <br /> i <br /> Control Limits 75-125 75 125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5060208 5060208 5060208 5060208 <br /> Date Prepared 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Date Analyzed 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Instrument l D #. GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery. 96 97 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 96 100 101 <br /> Relative% <br /> Difference 00 10 00 10 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that es analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS% recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or refect batch results <br /> Project Manager <br /> 5060120 GRW 7> <br />