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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> r}ri.3.V VS... r , '�. vv r .. r ♦r nn nr rvrvnn nn vrcv}vo ni}ryry .f r }vn ..w rK.,`rv'}':...+�-+yur v <br /> -RLSNA YChent pi roject JD -W63 i2 00, J8"rer[vim}6ai x; <br /> 1710 Main Street MatnK Water <br /> Escalon, CA 95320 <br /> ,Attention Lois Frantz QC Sample Group 3E15401 -04 Reported May 13, 1993 <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: M Nipp M Nipp M Nipp M Nipp <br /> Conc. Spiked. 10 10 10 10 <br /> Units ug/L Pg/L P9/L ug/L <br /> LCS Batch#,. GBLK050693 GBLK050693 GBLK050693 GBLK050693 <br /> Date Prepared NA NA N A N A <br /> Date Analyzed: 5/6/93 5/6/93 5/6/93 5/6/93 <br /> Instrument I D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 100 100 100 100 <br /> Control Limits: 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#: 133E05902 G3E05902 G3E05902 G3E05902 <br /> Date Prepared N A NA NA H A <br /> Date Analyzed, 5/6/93 5/6/93 5/6/93 5/6/93 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery. 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 99 99 100 100 <br /> Relative% <br /> Difference: 10 10 00 00 <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 /> A� preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> I` validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Vickie"fag <br /> Project Manager 3EI5401 WAT <2> <br />