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Sequoia 680 Chesapeake D., Redwood City,CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> CT) Analytical 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> 091`0 West Inc C <br /> Client Project IIS '' )'' v� A' <br /> ' 1 kaon#7-0137, Stockton, CA <br /> 1050 Melody Lane, Ste 160 Matrix Water <br /> Roseville, CA 95678 <br /> iAttention Mark Naugle CC Sample Group 5100890-896 Reported Nov 2, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> 7 ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method- EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked. 10,ug/L 10u9/L lour/L 30ug/L <br /> LCS Batch#: LCS102595 LCS102595 LCS102595 LCS102595 <br /> Date Prepared. 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Date Analyzed- 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> 1101 Recovery- 94 95 <br /> 97 96 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> 77-7"' <br /> 7 fix,} <br /> MS/MSD <br /> Batch {#: BS102595 BS102595 BS102595 BS102595 <br /> Date Prepared- 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Date Analyzed: 10/25/95 10/25/95 10/25/95 10/25/95 <br /> Instrument I.D.# GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 82 84 86 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 79 82 83 86 <br /> Relative% <br /> Difference- 40 2.4 36 2-0 <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 />'!Z <br /> / '7 � preparation and analytical methods employed for the samples The LCS%recovery data is used far <br /> c v , (,� validation of sample batch results Due to matrix effects,the CC limits for MS/MSD's are advisory only <br /> C Schrrelder and are not used to accept or reject batch results <br /> Project Manager <br /> 5100890 FUG <3� <br />