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] Y <br /> � Sequoia 680 Chesapeake Dave Redwood City CA 44063 (650) 364 9600 FAX X650)364 9233 <br /> 404 N Wtget Lanc Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 rAX (9 16) 921 0140 <br /> SECOR International Client Project ID Shell, 6220 S Virginia ST ,Reno NV <br /> 9912 Business Park Dr, Ste 100 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky OC Sample Group S806396 Reported Jul 10 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Concentration <br /> Spiked 20 ug/L 20 ug/L 20 ug/L 20 ug/1- <br /> LCS <br /> g/LLCS Batch# 07V8094-BS1 07VB094-BS1 07V8094-BSI 07V8094-BS1 <br /> Date Prepared 07/07/98 07/07/98 07/07/98 07/07/98 <br /> Date Analyzed 07/07/98 07/07/98 07/07/98 07/07/98 <br /> LCS % <br /> Recovery 95 100 100 100 <br /> Control Limits 70-130 70-130 70-130 70 130 <br /> MS/MSD 07V8094- 07V8094 07V8094- 07VB094- ~ <br /> Batch # BS1/BSD1 BS1/BSDI BSI/BSD1 BS1/BSD1 <br /> Date Prepared 07/07/98 07/07/98 07/07/98 07/07/98 <br /> Date Analyzed 07/07/98 07/07/98 07/07/98 07/07/98 <br /> Instrument I D # <br /> Matrix Spike <br /> Recovery 95 100 100 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 51 00 00 00 <br /> SEQUOIA <br /> 0 <br /> SEQUOIA ANALYTICAL Please Note <br /> % -, The LCS Is a control sample of known interferent free matrix that 1s analyzed using the same reagents <br /> r <br /> �y��� preparation and analytical methods employed for the sampEes The LCS%recovery tela rs used for <br /> O <br /> vandaUon of sample batch resuHs Due to matrix effects the C limits for MS MSD s are advisor only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> ` Project Manager/Sacramento Labora ary <br /> S806396SES <4> <br />