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• <br /> 6�N <br /> Sequoia 680 Chesapeake Dave Redwood C,ty CA 94063 (4i5) 364 9600 FAX(415) 364 9233 <br /> 4114 N Vl�get Lane Walnut Creek CA 94598 (510) 988 96FAX(510)988 9673 <br /> `ti X1,1 Analytical 00 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(916)971 0100 <br /> wn & Caldwell Client Project ID ARCO 02133, Stockton, CA <br /> 16 Micron Ave Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 7060186-0195 Reported Jun 18, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X ienes <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# LCS061697 LCS061697 LCS061697 LCS061697 <br /> Date Prepared 06/16/97 06/16/97 05/16/97 06/16/97 <br /> Date Analyzed 06/16/97 06/16/97 06/16/97 06/16/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 96 86 89 89 <br /> Control Limits 70-130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch # 7060345 7060345 7060345 7060345 <br /> Date Prepared 06/16/97 06/16/97 06/16/97 06/16/97 <br /> Date Analyzed 06/16/97 06/16/97 06/16/97 06/16/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 97 90 89 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 93 90 88 <br /> Relative % <br /> Difference 30 33 1 1 11 <br /> SEQUOIA ANALYTICAL Please (vote <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> 1WM FZVUA4-A0 preparation and analytical methods employed for the samples The LCS%recovery data Is used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSDs are advisory only <br /> E=darla M Fruciano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 7060186SRS <s> <br />