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SEQUOIA ANALYTICAL <br /> * a 819 Striker Avenue, Suite 8 e Sacramento, CA 95834 <br /> (916) 921 9600 • FAX (9 16) 921-0100 <br /> . Brown & Caldwell Client Project 10 ` Arco 434-93-5, Lodi <br /> 723 S St Matrix Air h wn n <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright OC Sample Group 3090219-220 Reported Sep 13, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylones <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravalioti Chiaravallob Chiaravailotl Chiaravalloti <br /> Concentration 20 20 20 40 <br /> Spiked, mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> LCS. Batch# BLK090993 BLK090993 BLK090993 BLK090993 <br /> Date Prepared 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Date Analyzed- 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> LCS % <br /> . Recovery 115 110 115 113 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ry J <br /> MS/MSD <br /> Batch #- 9LK090993 13LK090M 6LK090993 BLK090M <br /> Date Prepared: 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Date Analyzed, 9/9/93 9/9/93 9/9/93 9/9/93 <br /> Instrument l D #. HP 2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery: 115 110 115 113 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 120 115 115 113 <br /> Relative % <br /> Difference. 43 44 00 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> /G� �� L✓ and are not used to accept or reject batch resufts <br /> Linda C Schneider <br /> Project Manager 3090219 BRS <2> <br />