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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> X9161 9219600 FAX (916) 921 0100 <br /> • Brown & Caldwell Client Project lD Arco 434-93-5 Lodi <br /> P 0 Box 13449 Matrix Air <br /> Sacramento CA 95813-3449 <br /> Attention Mtndv Wright QC Sample Group 3120309-310 Reported Dec 10 1993 <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 Chiaravalloti Chiaravallots Chiaravalloti Chiaravalloti <br /> Concentration 20 20 20 60 <br /> Spiked mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS Batch# BLK120993 BLK120993 BLK120993 BLK120993 <br /> Date prepared 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Date Analyzed 12/9/93 12/9/93 12/9/93 12/9/93 <br /> instrument 1 D.# HP2 HP2 HP2 HP2 <br /> LCS % <br /> Recovery: 100 95 100 100 <br /> Control Limas: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#' BLK120M BI-K120993 BLK120993 BLK120993 <br /> Date prepared: 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Date Analyzed. 12/9/93 12/9/93 12/9/93 12/9/93 <br /> Instrument I D.#: HP2 HP2 HP2 HP2 <br /> Matnx Spike <br /> % Recovery• 100 95 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 105 100 105 107 <br /> Relative% <br /> Difference: 49 5 1 49 68 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matnx that is analyzed using the same reagents, <br /> /J0/�/J 1 preparaton and analytical methods employed for the samples The LCS%recovery data is used for <br /> j /� I " ✓��/�� `�G f validation of sample batch results flue to matrix effects,the QC limits for MS/MSD's are advisoryonly <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Protect Manager <br /> 3120309 BRS <2> <br />