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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 /> q%JF Analytical 819 Striker Avenue Su,te 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 0SH Client Project ID Lopez Property <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> Attention Mike Lee OC Sample Group 7070663-0665 Reported Jul 29, 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 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS072397 LCS072397 LCS072397 LCS072397 <br /> Date Prepared 07/23/97 07/23/97 07/23/97 07/23/97 <br /> Date Analyzed 07/23/97 07/23/97 07/23/97 07/23/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP 7 GCHP 7 <br /> • LCS <br /> Recovery 91 86 84 83 <br /> Control Limits 70 130 70-130 70 130 70-130 <br /> MS/MSD <br /> Batch # 7070667 7070667 7070667 7070667 <br /> Date Prepared 07/23/97 07/23/97 07/23/97 07/23/97 <br /> Date Analyzed 07/23/97 07/23/97 07/23/97 07/23/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> % Recovery 91 85 86 84 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 89 83 85 81 <br /> Relative % <br /> Difference 22 2 4 1 7 3 6 <br /> SEQUOI ANALYTICAL Please Nate <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 DC limits for MS/MSD's are advisory only <br /> a C Schneider and are not used to accept or reject batch results <br /> reject Manager/Sacramento Laboratory <br /> 7070663 ENS <3> <br />