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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)911 0100 <br /> oroundwater Technology Client project lD' 'Chevron #9-1918, Stockton, CA ry <br /> 1401 Halyard Drive, Suite 140 Matrix Sod <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota QC Sample Group 5060120-27, 130-37, 140-47 Reported Jun 6, 1995 <br /> v v <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 $/5/95 <br /> Date Analyzed 6/5/95 6/5/95 6/5/95 6/5/95 <br /> Instrument I D# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> . Recovery 93 93 94 93 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5051438 5051438 505143B 5051438 <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-2 GCHP-2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> %Recovery 96 96 98 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 96 96 97 96 <br /> Relative% <br /> Dltlerence 00 00 1 0 3 2 <br /> SEQUOIA ANALYTICAL Please Note <br /> r /r The LCS is a control sample of known interferent free matrix that is 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 OC limits for MS/MSDs are advisory only <br /> / Linda C Schneider and are not used to accept or refect batch results <br /> AProject Manager <br /> 5060120 GRW <a> <br />