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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(CS) 364-9233 <br /> „� Analytical 404 N W;get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988-9673 <br /> 919$tnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)92t 0100 <br /> • Brown & Caldwell Client Project ID Arco 434-95-5, Lodi <br /> 9616 Micron Ave , Suite 600 Matrw Air <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson QC Sample Grou 5081039-1040 Reported Aug 30, 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. 2 0 mg/m3 2 0 mg/m3 2 0 mg/m3 6 0 mg/m' <br /> LCS Batch# LCS082495 LCS082495 LCS082495 LCS082495 <br /> Date Prepared 8/24/95 8/24/95 8/24/95 8/24/95 <br /> Date Analyzed 8/24/95 8/24/95 8/24/95 8/24/95 <br /> Instrument LD#- GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> • LCS % <br /> Recovery as as ae 90 <br /> Control Llmrts. 75-125 75-125 75-125 75.125 <br /> { h x xW+{� rv,v+rc++44vrrr 1}}R4 rdJ„+ v s wv v vHrrr r .vvv s nx w....iaA}Jn.>..v}w.fv.nr n rn 4,,x i w wrr.v nA rc �} rwr w xiry r r .x.x..waq'+4�SSwY W ffr .r vwxrr <br /> MS/MSD <br /> Batch#• BS082495 SS082495 BS082495 BS082495 <br /> Date Prepared: 8/24/95 8/24/95 8/24/95 8/24/95 <br /> Date Analyzed: 8/24/95 8/24/95 8/24/95 8/24/95 <br /> Instrument LD#• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery, 88 88 88 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 91 92 92 91 <br /> Relative% <br /> Difference: 3 4 44 44 11 <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 /> &45;�' validation of sampie batch results Due to matnx effects,the QC Ilmtts for MS/MSUs are advisory only <br /> Janet H an and are not used to accept or reject batch results <br /> Project anger <br /> 5081039 BRS <2> <br />