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Sequoia 680 Chesapeake Orive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Rates Avcncre,Surto L Concord,CA 94520 <br /> Analytical (516) 626 9600 FAX(516) 626 9689 <br /> R 19 Striker Avenue Surtc R Sacramento CA 95R34 {916} 921 9600 fAX (916) 921 0100 <br /> Geocon Client Project ID SBOBO-06-02/305 S Hutchins <br /> 11333 Sunco Dr , Suite 100 Matrix Soll # <br /> Rancho Cordova, CA 95742 <br /> Attention John Juhrend OC Sample Goup 4110341-348 Reported Nov 23, 1994 z <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> a <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman G 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# LCS111094 LCS111094 LCS111094 LCS 111094 <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 y <br /> Recovery 100 100 100 100 <br /> Control Limits 75 125 75-125 75-125 75 125 <br /> 4 v <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 />' Matrix Spike <br /> % Recovery- 100 100 100 100 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery 100 100 100 98 <br />' Relative% <br /> Difference 00 00 00 20 <br /> SEQUOIA ANALYTICAL Please Dote <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> rf*i torn preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> I VVV r{�1� validation of sample batch results Due to matrix effects the OC limits for MS/MSD's are advisory only <br /> Jennie Hi g X and are not used to accept or refect batch results <br /> Project Manager 4110341 GEG <4> <br />