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4 / ■ ' Sequoia 680 Chesapeake Drive Redwood Ctry CA 94063 (415) 364%00 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9604 FAX(sio)9 s s 9673 <br /> 8 t 9 Sinker Avenue Suite 9 Sacramento CA 95834 (916) 921 %00 FAX(916)921 0100 <br /> Analytical <br /> *Brown &Caldwell Client Project ID Arco 05450, Stockton, CA <br /> 9616 Micron Ave, Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 703-0652 Reported Apr 1, 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 BW B w B w S w <br /> Concentration <br /> Spiked 200 ug/L 200 ug/L 200 ug/L 600 ug/L <br /> LCS Batch# LCS032497 LCS032497 LCS032497 LCS032497 <br /> Date Prepared 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> LCS <br /> Recovery 96 88 90 88 <br /> Control Limits 70-130 70.130 70-130 70-130 <br /> MS/MSD <br /> Batch# 7030770 7030770 7030770 7030770 <br /> Date Prepared 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Date Analyzed 03/24/97 03/24/97 03/24/97 03/24/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 88 85 90 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 86 90 88 <br /> Relative% <br /> Difference 22 1 2 00 00 <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 /> M � � a 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 CC limits for MS/MSG's are advisory only <br /> Edana M Fruciano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory 7030652 ERS <3> <br />