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SEQUOIA ANALYTICAL � <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> IWO (916) 921-9600 • FAX (916) 921 0100 <br /> Brown & Caldwell Client Protect ID Arco 434-94-5 Lodi <br /> P O Box 13449 Matrix Air <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 4040378-379 Reported Apr 14 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xvlenes <br /> Method EFA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalloti Chiaravalloti Chiaravallob Chiaravalloti <br /> Concentration <br /> Spiked 2 0 mg/m3 2 0 mg/ml 2 0 mg/mJ 6 0 mg/m, <br /> LCS Batch# BLK041394 BLK041394 BI-KO41394 BLK041394 <br /> Date Prepared 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Date Analyzed 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Instrument I D# HP-2 HP 2 HP-2 HP 2 <br /> LCS % <br /> Recovery, 90 90 90 as <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BLK041394 BLK041394 BLK041394 SLK041394 <br /> Date Prepared 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Date Analyzed 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Instrument I D #• HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 90 90 90 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 95 92 <br /> Relative % <br /> Difference: 54 00 54 44 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sam pie of known,interferent free matnx that is analyzed using the same reagents, <br /> 7�`� 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 /> Craig Cte and are not used to accept or reject batch results <br /> Project Manager <br /> 4040378 ERS <2> <br />