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J \ Sequoia 680 Chesapeake Drive Redwood City CA 94063 1415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94D98 r i 101 988 9600 SAX (510) 988 9673 <br /> WQ0 Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 19161 921 9600 FAX (916)92t 0100 <br /> Wrown &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 OC Sample Group 5110995-97 Reported Dec 6, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes TRPH Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 1 EPA 200 7 <br /> Analyst B Williams B Williams B Williams B Williams S Phillips K Barta <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m3 4 0 mg/L 0 50 mg/L <br /> LCS Batch# LCS111795 LCS111795 LCS111795 LCS111795 LCS112895 LCS 112195B <br /> Date Prepared 11/17/95 11/17/95 11/17/95 11/17/95 11/28/95 11/21/95 <br /> Date Analyzed 11/17/95 11/17/95 11/17/95 11/17/95 11/29/95 12/4/95 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP 2 IR-1 ICP-1 <br /> LCS % <br /> . Recovery 90 90 92 90 97 98 <br /> Control Limits 75-125 75-125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch # BS111795 BS111795 GS111795 BS111795 BS112895 5111096 <br /> Date Prepared 11/17/95 11/17/95 11/17/95 11/17/95 11/28/95 11/21/95 <br /> Date Analyzed- 11/17/95 11/17/95 11/17/95 11/17/95 11/29/95 12/4/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 ICP-1 <br /> Matrix Spike <br /> % Recovery 85 90 90 92 97 96 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 80 85 85 88 93 96 <br /> Relative % <br /> Difference 61 57 57 56 42 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 /> 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/MSD s are advisory only <br /> Janet an and are not used to accept or reject batch results <br /> Pralec anager <br /> 5110995 BRS <5? <br />