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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> V60P (415) 364-9600 FAX(415) 364-9233 <br /> RESNA "Client Project ID 15210202,NGT{ f4 H y ry n <br /> 1710 Main Street Matra Water <br /> Escalon, CA 95320 <br /> Attention Lois Frantz QC Sample Group 3175401, 03-06 Reported Sep 27, 1993 <br /> ` r r ,.. ,...n r ..r .. .rr r,.rr.. r .• tt c V` } .. ` ` ryM1 r ,, r.... }nnnv+.+...r Fn .. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyi- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: B All B Ah B Ali B Ah <br /> Conc. Spiked 10 10 10 30 <br /> Units ug/L ug/L wg/L ug/L <br /> LCS Batch#' GBLK092093 GBLK092W3 GSLK092093 GBLK092093 <br /> Date Prepared - - - - <br /> Date Analyzed: 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Instrument I.D #: GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> LCS % <br /> Recovery: 120 110 120 117 <br /> Control Limits: 80-120 80-120 M1[[20'' 80.120 <br /> ry r}r}.rr rs v. r ' v rpt s r. v v v rr . x. ♦t•}i v r ry r v»v rnrx rry t}vt "`• a rmv. vrrSArvr xW 4rr vr4Y •},ry <br /> MS/MSD <br /> Batch#. 3144504 3144504 3144504 3144504 <br /> Date Prepared - - - <br /> Date Analyzed 9/20/93 9/20/93 9/20/93 9/20/93 <br /> Instrument I.D.#- GCHP-18 GCHP-18 GCHP-18 GCHP-18 <br /> Matrix Spike <br /> % Recovery 120 120 120 123 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 95 95 94 93 <br /> Relative% <br /> DiHerence 23 23 24 28 <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 /> �� preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ! r validation of sample batch results Due to matrix effects,the CC limits for MS/MSD`s are advisory only <br /> and are not used to accept or reject hatch results <br /> Vickie Tague <br /> Project Manager 31775401 WAT <3> <br />