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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Sates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 woo <br /> 0Brown & Caldwell Client Project ID Arco 2133-94-2, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Goup 4120818-827 Reported Jan 5, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS010495 LCS010495 LCS010495 LCS010495 <br /> Date Prepared 1/4/95 1/4/95 1/4/95 1/4/95 <br /> Date Analyzed 1/4/95 1/4/95 1/4/95 1/4/95 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery 90 90 90 90 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 4120822 4120872 4120822 4120822 <br /> Date Prepared 1/4/95 1/4/95 1/4/95 1/4/95 <br /> Date Analyzed. 1/4/95 1/4/95 1/4/95 1/4/95 <br /> Instrument LD # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 100 95 100 95 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 00 51 00 51 <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 /> Q yv,.v�k+ yt�o preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> i 1 validation of sample batch results Due to matrix effects,the QC limits for MS/MSG's are advisory only <br /> Jennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 4120818 BRS <3> <br />