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1 - <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415)364-9600 • FAX (415) 364-9233 <br /> to as>,aux,o:ax�� .harY'aw9.swiur x,a^5.:. .w.:::_...•::••_';i',,. �� ,. ject:,- <br /> y rrai� C ,w,w GS,-„Ss��•cxifx"�.a-r',ttsSb�C :yS'�.xaf.+ <br /> Waterwork Client ProID W0388, Reeves Exxon <br /> ' 1710 Main Street <br /> Escalon, CA 95320 <br /> Attention Lois Frantz 9y QC Sample Group 112-3913, 3915-6 Reported- Jan 6, 1992 " <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 C Donohue C Donohue C Donohue C Donohue <br /> Reporting Units mg/kg mg/kg mg/kg mg/kg <br /> Date Analyzed Dec 27, 1991 Dec V. 1991 Dec 27, 1991 Dec 27, 1991 <br /> ' QC Sample# GBLK122791 -GBLK122791 GBf_K122791 GBLK122791 <br /> Sample Conc.: N.D N D N D N D <br /> Spike Conc. <br /> Added: 020 020 020 060 <br /> Conc Matrix <br /> ' Spike: 018 019 019 056 J <br /> ' Matrix Spike <br /> % Recovery: 90 95 95 93 <br /> ' Conc Matrix <br /> Spike Dup.: 019 019 019 057 <br /> ' Matrix Spike <br /> Duplicate <br /> % Recovery. 95 95 95 95 _ <br /> ' Relative <br /> % Difference: 54 00 00 is <br /> SEQUOIA ANALYTICAL Recovery Conc of M S -Conc of Sample x 100 <br /> Spike Conc Added <br /> �ae " ' "� Relative%Difference Conc of M S -Conc of M S 0 x 100 <br /> (Conc of M S + Conc of M S D)/2 <br /> P olect Manager 1123903 WAT <9> <br />