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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 /> Analytical 819 Sinker Avenue Su.te 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 06urdv+ater Technology Client Project 11) Chevron#9.1918, Stockton, CA Y <br /> 1401 Halyard Drive, Suite 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota OC 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#- LCS060695 LCS060695 LCS060695 LCS060695 <br /> Date Prepared 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Date Analyzed 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> • Recovery 94 94 96 96 <br /> Control Limits 75125 75 125 75-125 75-125 <br /> MS/MSD <br /> Batch# 5060065 5060065 5060065 5060065 <br /> Date Prepared. 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Date Analyzed 6/6/95 6/6/95 6/6/95 6/6/95 <br /> Instrument I.D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 <br /> Matrix Spike <br /> %Recovery 89 89 91 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 79 79 81 <br /> Relative% <br /> Difference 11 12 14 12 <br /> SEQUOIA ANALYTICAL Please Note <br /> X The LCS 1s a control sample of known interferent tree matrix that 1s analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSD s are advisory only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5060120 GRW <9> <br /> r� <br />