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k <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> M-West Client Project ID 653 30 /Santa Pe/Stockton <br /> 5 Capitol Mall, 8th Flr Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Laurie Depies OC Sample Group 5061738-1741 Reported Jul 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Analyst C Lee C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 10 mg/L 10 mg/L 10 mg/L 30 mg/L 300 ug/L <br /> LCS Batch# LC8071195 LCS071195 LCS071195 LCS071195 LCS070395A <br /> Date Prepared 7/11/95 7/11/95 7/11/95 7/11/95 7/3/95 <br /> Date Analyzed 7/11/95 7/11/95 7/11/95 7/11/95 7/3/95 <br /> Instrument 1 D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> LCS % <br /> 40 Recovery 101 100 101 101 91 <br /> Control Limits 75-125 75-125 75-125 75-125 60-130 <br /> MS/MSD <br /> Batch # 5061705 5061705 5061705 5061705 BS070395A <br /> Date Prepared- 7/11/95 7/11/95 7/11/95 7/11/95 7/3/95 <br /> Date Analyzed 7/11/95 7/11/95 7/11/95 7/11/95 7/3/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> Matrix Spike <br /> % Recovery- 98 99 99 99 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 98 98 99 98 n <br /> Relative <br /> Difference. 00 10 00 1 0 17 <br /> SEQUOIA ANALYTICAL Please Note <br /> 7 �1 The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> //�7 /• //�� / 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 <br /> 5061738 ERS <3> <br />