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` Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> ��•� Analyt�ea1 404 N Wiaet Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> gown & 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 5100967-969 Reported Nov 7, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 6020 EPA 5020 EPA 8020 <br /> Analyst: C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m1 2 0 mg/m3 6 0 mg/m3 <br /> LCS Batch# LCS102695 LCS102695 LCS102695 LCS102695 <br /> Date Prepared: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Date Analyzed: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Instrument I.11.13 #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> • Recovery 90 88 91 92 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #J!" BS102695 BS102695 BS102695 BS102695 <br /> Date Prepared. 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Date Analyzed: 10/26/95 10/26/95 10/26/95 10/26/95 <br /> Instrument LD #- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery: 90 85 91 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 85 56 87 87 <br /> Relative% <br /> Difference. 57 23 45 56 <br /> SEQUOIA ANALYTICAL Please(vote <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> Irl2� validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Jane arlan and are not used to accept or reject batch results <br /> Prole t Manager <br /> 5100967BRS <5> <br />