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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wtgct Cane 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 /> }pacific Environmental Croup Client Project ID 920 122 1A/Chevron 9-8840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson OC Sample Group 8030075-0076 Reported Mar 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> TRPH <br /> Method SM 5520 CF <br /> Analyst L Martin <br /> Concentration <br /> Spiked 100 mg/kg <br /> LCS Batch# LCS030498 <br /> Date Prepared 03/04/98 <br /> Date Analyzed 03/04/98 <br /> Instrument I D # IR-1 <br /> LCS % <br /> Recovery 81 <br /> Control Limits 70-130% <br /> MS/MSD <br /> Batch # 8020187 <br /> Date Prepared 02/26/98 <br /> Date Analyzed 02/26/98 <br /> Instrument I D # IR-1 <br /> Matrix Spike <br /> % Recovery <br /> Matrix Spike <br /> Duplicate % <br /> Recovery <br /> Relative % <br /> Difference <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> 1��QI�v� and are not used to accept or reject batch results *Matrix Interference <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8030075 PES <2> <br />