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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) o86 9600 FAX(510) 686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 x100 <br /> fulgro West, Inc "Client Project ID Sheil,A2575'CourltriClub, Siockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Soli <br /> > Roseville, CA 95678 Reported May 23 1995 <br /> Attention Sudhakar Talankl OC Sample Group 5050385-393 P h y ,, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTEnth i- <br /> y <br /> Benzene Toluene Benzene Xylenes <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# LCS051595 LCSOS1595 LCS051595 LCS051595 <br /> Date Prepared 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Date Analyzed 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> . LCS % <br /> Recovery 90 40 90 92 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5050510 5050510 5050510 5050510 <br /> Date Prepared 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Date Analyzed- 5/15/95 5/15/95 5/15/95 5/15/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery' 85 85 85 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 85 90 92 <br /> Relative % <br /> Difference. 00 00 57 20 <br /> EQUOIA ANALYTICAL Please Note <br /> / The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analyncal methods employed for the samples The LCS o recovery data Is used for <br /> validation or sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br />/Linda C Sehnelder and are not used to accept or refect batch results <br /> Project Manager 5050385 FUG <5> <br />