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t � <br /> 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 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> t <br /> OroWest, Inc Client Project 10 Shell, 2575 Country Club,`Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Sall <br /> ` Roseville, CA 95678 Reported May 23, 1995 <br /> 'Attention Sudhakar Talankl CC Sample Group 5050385-393 p y <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 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# LCS051995 LCS051995 LCS051995 LCS051995 <br /> Date Prepared. 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Date Analyzed 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery 90 85 s0 $$ <br /> Control Limits. 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Hatch # 5050525 5050525 5050525 5050525 <br /> Date Prepared 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Date Analyzed 5/19/95 5/19/95 5/19/95 5/19/95 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> Matrix Spike <br /> % Recovery 90 90 90 95 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 90 g0 95 9s <br /> Relative% <br /> Difference: 00 00 <br /> 5 a 3 1 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> The LCS 96 recovery <br /> / preparation and analytical methods employed for the samples overy data is used for MSD's are advisory only <br /> LCC�r validation of sample batch results Due to matrix effects,the CC limos far MS/ <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5050385 FUG �a> <br />