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Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 96W FAX(510)988-9673 <br /> Anal yt*ca l 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-Ot00 <br /> RM ON Client Project IES 1$C-Stockton <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila OC Sample Group 7080914-0915 Reported Sep 8, 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, S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#- LCS082997 LCS082997 LCS082997 LCS082997 <br /> Date Prepared 08/29/97 08/29/97 08/29/97 08/29/97 <br /> Date Analyzed 08/29/97 08/29/97 08/29/97 08/29/97 <br /> Instrument I D #• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> . LCS <br /> Recovery 100 94 93 93 <br /> Control Limits, 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 7081120 7081120 7081120 7081120 <br /> Date Prepared: 08/29/97 08/29/97 08/29/97 08/29/97 <br /> Date Analyzed: 08/29/97 08/29/97 08/29/97 08/29/97 <br /> Instrument I D.# GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> %Recovery* 94 90 89 86 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 94 89 88 64 <br /> Relative % <br /> Difference 00 1 1 1 1 24 <br /> SEQUOIA ANALYTICA Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> 0 ? r% �� erenaration and analytical methods employed for the samples The LCS% recovery data is used for <br /> �/✓tel/c.ilL.� validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> inch l; SChneiU9r and are not used to accept or resect batch results <br /> Protect Manager/Sacramento La ra ory <br /> 7080914 EMC <2> <br />