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-sequoia-- 680 Chesapeake Drive= Redwood City CA--94063 w_-(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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Geocon Client Project ID S8080-06-02/305 S Hutchins <br /> 11333 Sunco Dr, Suite 100 Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention John Juhrend OG Sample Goup 4110341-348 Reported Nov 23, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 80020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman" <br /> Concentration <br /> y 1 Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Batch# LCS111094 LCS111094 LCS111094 LCS111094 <br /> Date Prepared 11/10/94 11/10/94 11/10/94 11/10/94 <br />' Date Analyzed 11/10/94 11/10/94 11/10/94 11/10/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery, 100 100 100 100 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 4110371 ' 4110371 4110371 4110371 <br />' Date Prepared 11/10/94 11/10/94 11/10/94 11/10/94 <br /> Date Analyzed 11/10/94 11/10/94 11/10/94 11/10/94 <br /> Instrument I,D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br />' <br /> Matrix Spike <br /> % Recovery: 10o 100 100 100 <br /> ,Matrix Spike <br /> Duplicate % <br /> Recovery: 100 100 100 98 <br />' Relative% <br /> Difference: 00 00 00 20 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �IJG'r;�I� Q �'{ }i{ r 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 QC limits for MS/MSDs are advisory only <br /> Jennie Hig;�s `'r�J1f and are not used to accept or reject batch results <br /> Project Manager 4110341 GEC <4> f <br /> 1 <br />