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4 J:i Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 11W Analytical 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921-96W FAX(916)921 oloo <br /> Wi]indwater Technology Client Project 10 Chevron#9-1918, Stockton, CA <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 Xylenes <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# LCS060295 LCS060295 LCS060295 LCS060295 <br /> Date Prepared. 6/2/95 6/2/95 6/2/95 6/2/95 <br /> Date Analyzed 6/2/95 6/2/95 6/2/95 6/2/95 <br /> Instrument I D #. GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> . Recovery 91 92 93 91 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5050103 5050103 5050103 5050103 <br /> Date Prepared 6/2/95 6/2/95 6/2/95 6/2/95 <br /> Date Analyzed 6/2/95 6/2/95 6/2/95 6/2/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 92 93 94 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 91 90 93 91 <br /> Relative% <br /> Difference 1 1 33 1 1 2 2 <br /> SEQUOIA ANALYTICAL Please Note <br /> / The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> `% !7 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 /> /* <br /> ' Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060120 GRW <6> <br />