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Sequoia 6SO Chesapeake L]rivc Redwood Ctty CA 94063 1415) 364 9600 FAX(4151 364 9233 <br /> �,� r,0; N Wtget Lane Walnut Crcck CA 94:99 �10) 939 9600 F4X(510) 988 9673 <br /> �Il� Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95934 X9161 921 9600 FAX(916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-95-5, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Air/Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 5110995-97 Reported Dec 6 1995 <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 Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS112695 LCS112695 LCS112695 LCS112695 <br /> Date Prepared 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Date Analyzed 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery 92 115 113 111 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5111148 5111148 5111148 5111148 <br /> Date Prepared 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Date Analyzed 11/26/95 11/26/95 11/26/95 11/26/95 <br /> Instrument I D #. GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 78 99 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 84 106 103 103 <br /> Relative % <br /> Difference: 74 68 60 60 <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 /> 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 /> Janeteanager <br /> and are not used to accept or reject batch results <br /> Projec <br /> 5110995 BRS <6> <br />