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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wtget 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 /> Weinfelder Client project ID 20-1129-30 <br /> 2825 East Myrtle St Matrix Water <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 7050605-06 Reported Jun 3, 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 B Willams. B Willams B Willams B Willams <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LC6052797 LCS052797 LCS052797 LG5052797 <br /> ' Date Prepared 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Date Analyzed 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 93 94 95 95 <br /> ' Control Limits- 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 7050607 7050607 7050607 7050607 <br /> ' Date Prepared 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Date Analyzed 05/27/97 05/27/97 05/27/97 05/27/97 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP 7 GCHP 7 <br /> ' Matrix Spike <br /> % Recovery 89 92 92 92 <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 94 97 97 97 <br /> Relative% <br /> Difference 5 5 53 5 3 53 <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 /> M FR Z44 A0 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/MSD's are advisory only <br /> Edana M )=ruciano and are not used to accept or refect batch results <br /> Project Manager/Sacramento Labor-5077- <br /> 7050605 <br /> abors ory7050605 KLF <8> <br />