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` 1 • (. i� <br /> Sequoia 630 Chesaocauc Dnve Redwood Cay CA 94063 '415) 364 9600 FAX(415) 364 9233 <br /> nalvtlea� 404 N W,Qet Lane Valnut Creek C4 94598 (510) 938 9600 FAX(5 10)988 %73 <br /> 319 Str=Ker Avenue 5wte 8 Sacramento CA 95834 9161 921 9600 FAX (916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 434-95-5, Loal <br /> 9516 Micron Ave Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Group 5090391-392 Reported Sep 21, 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 Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 2 0 mg/ml 2 0 mg/m' 2 0 mg/m' 6 0 mg/m' <br /> I_C7 9atch;; �;SCS1495 LC21191 a45 C3001495 L�Ion91-Irs <br /> Date Prepared 9/14/95 9/14/95 9/14/95 9/14/95 <br /> Date Analyzed. 9/14/95 9/14/95 9/14/95 9/14/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> • LCS % <br /> Recovery- los 106 106 las <br /> Control Umrt9 75-125 75.125 75-125 75-125 <br /> t <br /> MS/MSD <br /> Batch# BS091495 SS091495 BS091495 BS091495 <br /> Date Prepared. 9/14/95 9/14/95 9/14/95 9/14/95 <br /> Date Analyzed 9/14/95 9/14/95 9/14/95 9/14/95 <br /> Instrument I D.# GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> Matnx Spike <br /> % Recovery. 106 106 106 106 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 104 104 104 103 <br /> Relative% <br /> Difference 1 9 19 1 9 29 <br /> SEQUOIA ANALYTICAL Please Note <br /> ' } 0 The LCS is a control sampie of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and analyhcat methods employed for the samples The LCS%recovery data Is used for <br /> Lw l� validatlon of sample batch results Due to matrix effects,the QC Iimrts for MS/MS[Ys are advisory only <br /> ,Janet H an and are not used to accept or reject batch results <br /> Project anager <br /> 5090391 BRS <2> <br />