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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364:92?J1 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �IV <br /> Cambria Environmentaf Client Project 10 Shell, 7910 Lower Sacramento act, Stockton f <br /> P O Box 259 Matrix Water <br /> Sonoma, CA 95476-0259 <br /> Attention Thomas Magney OC Sample Group 712-0783 Reported Dec 30, 1997 <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 S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 0 010 mg/L 0 010 mg/L 0 010 mg/L 0 030 mg/L <br /> LCS Batch# LCS122997 LCS122997 LCS122997 LCS122997 <br /> Date Prepared 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Date Analyzed 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS y . <br /> Recovery 103 97 96 96 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7120836 7120836 7120836 7120836 <br /> Date Prepared 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Date Analyzed 12/29/97 12/29/97 12/29/97 12/29/97 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 106 99 99 99 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 107 98 98 97 <br /> Relative % <br /> Difference 094 10 1 0 2 0 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data is used for � <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 7120783 CES ¢2> <br />