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45) Sequoia 680 Ch.peake 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%89 <br /> q%W Analytical 819 Striker Avenue Suite 8 Sammento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 086ndwater <br /> Technology Client Project It)n Chevron ##9-19' 8,-Stockton, CA Y <br /> 1401 Halyard Dave, Suite 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota OC Sample Group 5060201-209 Reported Jun 7, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes j <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <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 L08060595 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 LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS% <br /> Recovery. 95 ss 97 97 <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 I 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 /> 1 <br /> 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 CC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060201 GRW <3> <br />